Commit 3fb1a65292351a32ab3a14059337f9bc8f4d6f96 | toolkit

author	clover caruso <git@paperclover.net> 2026-07-12 17:28:34-07:00
committer	clover caruso <git@paperclover.net> 2026-07-12 17:29:19-07:00
log	3fb1a65292351a32ab3a14059337f9bc8f4d6f96
tree	a6b0d37be30e59c0669ae6a28c9669b8015ae0d4
parent	eb97c459390bdb39eb6ecf071fd0932a8386edac
signature	Signed by SSH key SHA256:xbd+BjjhyBfwk7GVoURf9Yx0gzDerHbvYv7SddNWmAs

add clover pitch and bugs for sequencer

38 files changed, 4470 insertions(+), 11832 deletions(-)

pitch/Sources/Pitch/AudioEngine.swift+41

...	...	@@ -35,6 +35,9 @@ final class AudioEngine: ObservableObject, @unchecked Sendable {
35	35	@Published var isRunning = false
36	36	@Published var permission: MicPermission = .unknown
37	37	@Published var statusMessage: String?
	38	/// Rolling key estimate (updated on the main thread as notes land). Low
	39	/// frequency, so publishing it doesn't churn the SwiftUI tree per frame.
	40	@Published var keyEstimate: KeyEstimate?
38	41
39	42	private let engine = AVAudioEngine()
40	43	// Sensitive settings: low RMS gate so quiet singing registers, and a
...	...	@@ -56,6 +59,11 @@ final class AudioEngine: ObservableObject, @unchecked Sendable {
56	59	// Small median window to reject single-frame octave/spike errors.
57	60	private var recentMidi = [Double]()
58	61
	62	// Note segmentation ("intentional note" layer) + its guard lock. Fed on the
	63	// audio thread; read by the graph on the display thread.
	64	private let segmenter = NoteSegmenter()
	65	private let notesLock = NSLock()
	66
59	67	// History shared with the UI thread.
60	68	private let historyLock = NSLock()
61	69	private var history = [PitchSample]()
...	...	@@ -179,6 +187,8 @@ final class AudioEngine: ObservableObject, @unchecked Sendable {
179	187	recentMidi.removeAll(keepingCapacity: true)
180	188	framesProcessed = 0
181	189	haveStart = false
	190	notesLock.lock(); segmenter.reset(); notesLock.unlock()
	191	DispatchQueue.main.async { self.keyEstimate = nil }
182	192	}
183	193
184	194	// MARK: - Audio-thread processing
...	...	@@ -210,6 +220,7 @@ final class AudioEngine: ObservableObject, @unchecked Sendable {
210	220
211	221	let sr = detector.sampleRate
212	222	var newSamples = [PitchSample]()
	223	var noteCommitted = false
213	224
214	225	while accumulator.count >= windowSize {
215	226	var result: YINDetector.Result?
...	...	@@ -225,8 +236,14 @@ final class AudioEngine: ObservableObject, @unchecked Sendable {
225	236	newSamples.append(PitchSample(time: windowStartTime, midi: midi, clarity: r.clarity))
226	237	setLive(LivePitch(frequency: freq, midi: midi, clarity: r.clarity, level: r.level),
227	238	at: windowStartTime)
	239	notesLock.lock()
	240	if segmenter.feed(time: windowStartTime, midi: midi) { noteCommitted = true }
	241	notesLock.unlock()
228	242	} else {
229	243	recentMidi.removeAll(keepingCapacity: true)
	244	notesLock.lock()
	245	if segmenter.feedSilence(now: windowStartTime) { noteCommitted = true }
	246	notesLock.unlock()
230	247	}
231	248
232	249	accumulator.removeFirst(hop)
...	...	@@ -234,6 +251,30 @@ final class AudioEngine: ObservableObject, @unchecked Sendable {
234	251	}
235	252
236	253	if !newSamples.isEmpty { appendHistory(newSamples) }
	254	if noteCommitted { updateKey() }
	255	}
	256
	257	/// Recompute the key from committed notes (duration-weighted). Called only
	258	/// when a note lands, so it's cheap; the result is published on the main
	259	/// thread for the top-bar readout.
	260	private func updateKey() {
	261	notesLock.lock()
	262	var weights = [Double](repeating: 0, count: 12)
	263	for n in segmenter.committed {
	264	weights[(((n.midi % 12) + 12) % 12)] += n.duration
	265	}
	266	notesLock.unlock()
	267	let est = Music.estimateKey(weights: weights)
	268	DispatchQueue.main.async { self.keyEstimate = est }
	269	}
	270
	271	/// Snapshot of committed notes ending at/after `since`, plus the note being
	272	/// sung right now (if any). Read by the graph each frame.
	273	func noteSnapshot(since: Double) -> (committed: [NoteEvent], pending: NoteEvent?) {
	274	notesLock.lock()
	275	defer { notesLock.unlock() }
	276	let committed = segmenter.committed.filter { $0.offset >= since }
	277	return (committed, segmenter.pending)
237	278	}
238	279
239	280	/// Median-of-3 over consecutive detections — removes lone octave/spike

pitch/Sources/Pitch/Music.swift+58

...	...	@@ -73,6 +73,64 @@ enum Music {
73	73	}
74	74	}
75	75
	76	// MARK: - Key estimation (Krumhansl–Schmuckler)
	77
	78	struct KeyEstimate {
	79	let tonic: Int // pitch class 0–11 (concert)
	80	let isMajor: Bool
	81	let confidence: Double // 0…1, gap between the best and next-best fit
	82	}
	83
	84	extension Music {
	85	// Krumhansl–Kessler tonal-hierarchy profiles: how strongly each scale
	86	// degree "belongs" in a major / minor key. Index 0 == the tonic.
	87	static let majorProfile: [Double] =
	88	[6.35, 2.23, 3.48, 2.33, 4.38, 4.09, 2.52, 5.19, 2.39, 3.66, 2.29, 2.88]
	89	static let minorProfile: [Double] =
	90	[6.33, 2.68, 3.52, 5.38, 2.60, 3.53, 2.54, 4.75, 3.98, 2.69, 3.34, 3.17]
	91
	92	/// Estimate key from a 12-bin, duration-weighted pitch-class histogram.
	93	/// Correlates the histogram against all 24 key profiles and returns the best
	94	/// fit. Returns nil until there's enough distinct pitch material to be useful.
	95	static func estimateKey(weights: [Double]) -> KeyEstimate? {
	96	guard weights.count == 12 else { return nil }
	97	guard weights.filter({ $0 > 0 }).count >= 3 else { return nil }
	98
	99	func correlate(_ x: [Double], _ p: [Double]) -> Double {
	100	let mx = x.reduce(0, +) / 12, mp = p.reduce(0, +) / 12
	101	var num = 0.0, dx = 0.0, dp = 0.0
	102	for i in 0..<12 {
	103	let a = x[i] - mx, b = p[i] - mp
	104	num += a * b; dx += a * a; dp += b * b
	105	}
	106	let den = (dx * dp).squareRoot()
	107	return den == 0 ? 0 : num / den
	108	}
	109
	110	var best = (r: -2.0, tonic: 0, major: true)
	111	var second = -2.0
	112	for tonic in 0..<12 {
	113	var rot = [Double](repeating: 0, count: 12)
	114	for i in 0..<12 { rot[i] = weights[(i + tonic) % 12] }
	115	for (r, isMaj) in [(correlate(rot, majorProfile), true),
	116	(correlate(rot, minorProfile), false)] {
	117	if r > best.r { second = best.r; best = (r, tonic, isMaj) }
	118	else if r > second { second = r }
	119	}
	120	}
	121	guard best.r > 0 else { return nil }
	122	return KeyEstimate(tonic: best.tonic, isMajor: best.major,
	123	confidence: max(0, min(1, best.r - max(0, second))))
	124	}
	125
	126	/// Display name for a key, honoring the current naming + transpose, e.g.
	127	/// "G major".
	128	static func keyName(_ key: KeyEstimate, naming: NoteNaming, transpose: Int) -> String {
	129	let pc = (((key.tonic + transpose) % 12) + 12) % 12
	130	return "\(naming.names[pc]) \(key.isMajor ? "major" : "minor")"
	131	}
	132	}
	133
76	134	// MARK: - Vocal / instrument ranges
77	135
78	136	struct PitchRange: Identifiable, Hashable {

pitch/Sources/Pitch/NoteSegmenter.swift created+120

...	...	@@ -0,0 +1,120 @@
	1	import Foundation
	2
	3	/// One committed "intentional" note — a stable pitch you actually meant to sing,
	4	/// with a start, an end, and how sharp/flat you held it.
	5	struct NoteEvent: Identifiable {
	6	let id: Int
	7	let midi: Int // integer MIDI (concert pitch, before transpose)
	8	let onset: Double // seconds on the CACurrentMediaTime clock
	9	var offset: Double // seconds
	10	let meanCents: Double // signed average deviation from the integer, in cents
	11	var duration: Double { offset - onset }
	12	}
	13
	14	/// Turns a stream of fractional-MIDI pitch samples into discrete note events —
	15	/// the piano-roll layer that sits above the raw pitch contour.
	16	///
	17	/// This is a lightweight, real-time analogue of pYIN's note HMM:
	18	/// • a tolerance band around the current note absorbs vibrato and small drift,
	19	/// so a wobbling held note reads as ONE note instead of flickering;
	20	/// • when the pitch leaves that band the note is closed and a new one opens;
	21	/// • notes shorter than `minDuration` are discarded, so scoops and passing
	22	/// tones on the way to a target don't become spurious notes;
	23	/// • a silence gap longer than `gapToEnd` closes the held note.
	24	final class NoteSegmenter {
	25	// Tunables. Cents are hundredths of a semitone; a semitone is 100 cents, so
	26	// a note "owns" ±centsTolerance around its center — the overlap past the
	27	// 50-cent midpoint is the hysteresis that keeps vibrato from splitting notes.
	28	private let centsTolerance = 62.0
	29	private let minDuration = 0.10 // seconds; below this a region is dropped
	30	private let gapToEnd = 0.13 // seconds of silence that ends a held note
	31	private let retain = 30.0 // seconds of committed notes kept
	32
	33	private(set) var committed: [NoteEvent] = []
	34
	35	// In-progress note.
	36	private var pendingMidi: Int?
	37	private var pendingOnset = 0.0
	38	private var pendingCentsSum = 0.0
	39	private var pendingCount = 0
	40	private var lastVoiced = 0.0
	41	private var nextID = 0
	42
	43	/// Feed one voiced sample. Returns true iff a note was committed (ended).
	44	@discardableResult
	45	func feed(time: Double, midi: Double) -> Bool {
	46	var didCommit = false
	47
	48	// A silence gap since the previous voiced sample closes the held note.
	49	if pendingMidi != nil, time - lastVoiced > gapToEnd {
	50	didCommit = closePending(offset: lastVoiced)
	51	}
	52
	53	if let cur = pendingMidi {
	54	let distCents = abs(midi - Double(cur)) * 100
	55	if distCents <= centsTolerance {
	56	// Still the same note — absorb the sample (this is what swallows
	57	// vibrato even as the nearest semitone flips back and forth).
	58	pendingCentsSum += (midi - Double(cur)) * 100
	59	pendingCount += 1
	60	lastVoiced = time
	61	} else {
	62	// Pitch has moved off the note: close it, open a new one.
	63	didCommit = closePending(offset: lastVoiced) \|\| didCommit
	64	openPending(time: time, midi: midi)
	65	}
	66	} else {
	67	openPending(time: time, midi: midi)
	68	}
	69	return didCommit
	70	}
	71
	72	/// Feed a detector "silence" tick so a held note eventually closes even if no
	73	/// further voiced sample arrives. (Gaps are also caught lazily in `feed`.)
	74	@discardableResult
	75	func feedSilence(now: Double) -> Bool {
	76	guard pendingMidi != nil, now - lastVoiced > gapToEnd else { return false }
	77	return closePending(offset: lastVoiced)
	78	}
	79
	80	/// The note currently being sung, as a provisional event for live rendering.
	81	var pending: NoteEvent? {
	82	guard let m = pendingMidi, pendingCount > 0 else { return nil }
	83	// Only surface it once it's plausibly a note, not a passing scoop.
	84	guard lastVoiced - pendingOnset >= minDuration * 0.5 else { return nil }
	85	return NoteEvent(id: -1, midi: m, onset: pendingOnset, offset: lastVoiced,
	86	meanCents: pendingCentsSum / Double(pendingCount))
	87	}
	88
	89	func reset() {
	90	committed.removeAll(keepingCapacity: true)
	91	pendingMidi = nil
	92	pendingCount = 0
	93	}
	94
	95	// MARK: - Private
	96
	97	private func openPending(time: Double, midi: Double) {
	98	let m = Int(midi.rounded())
	99	pendingMidi = m
	100	pendingOnset = time
	101	pendingCentsSum = (midi - Double(m)) * 100
	102	pendingCount = 1
	103	lastVoiced = time
	104	}
	105
	106	@discardableResult
	107	private func closePending(offset: Double) -> Bool {
	108	guard let m = pendingMidi else { return false }
	109	pendingMidi = nil
	110	guard offset - pendingOnset >= minDuration, pendingCount > 0 else { return false }
	111	committed.append(NoteEvent(id: nextID, midi: m, onset: pendingOnset,
	112	offset: offset, meanCents: pendingCentsSum / Double(pendingCount)))
	113	nextID += 1
	114	let cutoff = offset - retain
	115	if let first = committed.first, first.offset < cutoff {
	116	committed.removeAll { $0.offset < cutoff }
	117	}
	118	return true
	119	}
	120	}

pitch/Sources/Pitch/PitchGraphView.swift+27

...	...	@@ -78,6 +78,7 @@ private struct TraceCanvas: View {
78	78	let visible = settings.visibleSeconds
79	79	let live = engine.currentLive()
80	80
	81	drawNotes(ctx: &ctx, layout: layout, now: now, visible: visible)
81	82	drawBand(ctx: &ctx, size: size, layout: layout, live: live)
82	83	drawTrace(ctx: &ctx, layout: layout, now: now, visible: visible)
83	84	drawPill(ctx: &ctx, size: size, layout: layout, live: live)
...	...	@@ -91,6 +92,32 @@ private struct TraceCanvas: View {
91	92	private static let clockOffset: Double =
92	93	CACurrentMediaTime() - Date().timeIntervalSinceReferenceDate
93	94
	95	// Piano-roll bars for the segmented "intentional" notes, drawn behind the
	96	// live trace. Committed notes are solid; the note being sung right now is
	97	// brighter and grows at the leading edge.
	98	private func drawNotes(ctx: inout GraphicsContext, layout: PitchLayout,
	99	now: Double, visible: Double) {
	100	let (committed, pending) = engine.noteSnapshot(since: now - visible - 1)
	101	// Bars are taller than the trace (4.2 px) so the note reads as a distinct
	102	// block with the pitch line threading through it, not a sliver the trace
	103	// hides. A crisp outline defines each note's edges.
	104	let h = min(layout.rowHeight * 0.85, 26)
	105
	106	func bar(_ n: NoteEvent, fill: Color) {
	107	let x0 = max(0, layout.x(n.onset, now: now, visible: visible))
	108	let x1 = min(layout.plotWidth, layout.x(n.offset, now: now, visible: visible))
	109	guard x1 > x0 else { return }
	110	let yy = layout.y(Double(n.midi))
	111	let rect = CGRect(x: x0, y: yy - h / 2, width: x1 - x0, height: h)
	112	let path = Path(roundedRect: rect, cornerRadius: min(5, h / 2))
	113	ctx.fill(path, with: .color(fill))
	114	ctx.stroke(path, with: .color(palette.noteBarEdge), lineWidth: 1)
	115	}
	116
	117	for n in committed { bar(n, fill: palette.noteBar) }
	118	if let p = pending { bar(p, fill: palette.notePending) }
	119	}
	120
94	121	// Thin solid coral line marking the nearest note — a couple of pixels
95	122	// thicker than a staff line.
96	123	private func drawBand(ctx: inout GraphicsContext, size: CGSize,

pitch/Sources/Pitch/Theme.swift+11-2

...	...	@@ -15,6 +15,9 @@ struct Palette {
15	15	var pillText: Color
16	16	var trace: Color
17	17	var dot: Color
	18	var noteBar: Color // committed "intentional" note
	19	var notePending: Color // the note being sung right now
	20	var noteBarEdge: Color // crisp outline so bars read under the trace
18	21
19	22	static func make(_ scheme: ColorScheme) -> Palette {
20	23	scheme == .dark ? .dark : .light
...	...	@@ -31,7 +34,10 @@ struct Palette {
31	34	pill: Color(red: 0.93, green: 0.49, blue: 0.45),
32	35	pillText: Color.white,
33	36	trace: Color(red: 0.20, green: 0.24, blue: 0.31),
34		dot: Color(red: 0.20, green: 0.24, blue: 0.31))
	37	dot: Color(red: 0.20, green: 0.24, blue: 0.31),
	38	noteBar: Color(red: 0.36, green: 0.52, blue: 0.90).opacity(0.28),
	39	notePending: Color(red: 0.36, green: 0.52, blue: 0.90).opacity(0.44),
	40	noteBarEdge: Color(red: 0.28, green: 0.44, blue: 0.85).opacity(0.65))
35	41
36	42	static let dark = Palette(
37	43	background: Color(red: 0.09, green: 0.10, blue: 0.12),
...	...	@@ -44,7 +50,10 @@ struct Palette {
44	50	pill: Color(red: 0.90, green: 0.47, blue: 0.44),
45	51	pillText: Color.white,
46	52	trace: Color(red: 0.93, green: 0.95, blue: 0.99),
47		dot: Color(red: 0.93, green: 0.95, blue: 0.99))
	53	dot: Color(red: 0.93, green: 0.95, blue: 0.99),
	54	noteBar: Color(red: 0.55, green: 0.68, blue: 0.99).opacity(0.26),
	55	notePending: Color(red: 0.55, green: 0.68, blue: 0.99).opacity(0.44),
	56	noteBarEdge: Color(red: 0.62, green: 0.74, blue: 1.0).opacity(0.7))
48	57	}
49	58
50	59	/// Shared plot geometry so the static grid layer and the animated trace layer

pitch/Sources/Pitch/TopBar.swift+39

...	...	@@ -52,6 +52,7 @@ struct TopBar: View {
52	52
53	53	Spacer(minLength: 8)
54	54
	55	KeyPill(engine: engine, settings: settings)
55	56	StatusPill(engine: engine)
56	57	}
57	58	.padding(.horizontal, 16)
...	...	@@ -92,6 +93,44 @@ private struct Dropdown<Content: View>: View {
92	93	}
93	94	}
94	95
	96	/// Live key estimate (Krumhansl–Schmuckler) shown in the top bar. Dims when the
	97	/// fit is weak so a shaky guess reads as tentative.
	98	private struct KeyPill: View {
	99	@ObservedObject var engine: AudioEngine
	100	@ObservedObject var settings: Settings
	101
	102	var body: some View {
	103	HStack(spacing: 6) {
	104	Image(systemName: "music.note")
	105	.font(.system(size: 11, weight: .semibold))
	106	.foregroundColor(.secondary)
	107	Text(text)
	108	.font(.system(size: 11, weight: .medium))
	109	.foregroundColor(.secondary)
	110	.lineLimit(1)
	111	}
	112	.opacity(opacity)
	113	.padding(.horizontal, 10)
	114	.padding(.vertical, 5)
	115	.background(
	116	RoundedRectangle(cornerRadius: 8)
	117	.fill(Color(nsColor: .controlBackgroundColor))
	118	.overlay(RoundedRectangle(cornerRadius: 8).stroke(Color(nsColor: .separatorColor), lineWidth: 1))
	119	)
	120	.help("Estimated key (Krumhansl–Schmuckler), from the notes you've sung")
	121	}
	122
	123	private var text: String {
	124	guard let k = engine.keyEstimate else { return "Key —" }
	125	return "Key " + Music.keyName(k, naming: settings.naming, transpose: settings.transpose)
	126	}
	127
	128	private var opacity: Double {
	129	guard let k = engine.keyEstimate else { return 0.55 }
	130	return 0.6 + 0.4 * min(1, k.confidence / 0.1)
	131	}
	132	}
	133
95	134	private struct StatusPill: View {
96	135	@ObservedObject var engine: AudioEngine
97	136

recorder/engine/Sources/recorder/CaptureEngine.swift+21-3

...	...	@@ -276,15 +276,21 @@ final class CaptureEngine {
276	276	fallbackDir: safeRoot)
277	277	}
278	278
279		private func makeAudioWriter(name: String, kind: String) throws -> StreamWriter {
	279	private func makeAudioWriter(name: String, kind: String, channels: Int = 2) throws -> StreamWriter {
280	280	// AAC in .m4a: ~256 kbps stereo, transparent for voice/desktop and tiny next
281	281	// to the uncompressed PCM we used to write. Audio is the irreplaceable
282	282	// stream and costs ~115 MB/hour, so it records to the safe (internal) disk
283	283	// rather than the removable scratch drive.
	284	//
	285	// `channels` must match the source: system audio is genuinely stereo, but a
	286	// mono mic forced into a 2-channel file lands entirely in channel 0 (left)
	287	// and leaves the right dead silent — the file then plays only in the left
	288	// ear on headphones. Writing a true mono file lets AVFoundation upmix it to
	289	// both channels on playback.
284	290	let settings: [String: Any] = [
285	291	AVFormatIDKey: kAudioFormatMPEG4AAC,
286	292	AVSampleRateKey: 48_000,
287		AVNumberOfChannelsKey: 2,
	293	AVNumberOfChannelsKey: channels,
288	294	AVEncoderBitRateKey: 256_000,
289	295	]
290	296	return try StreamWriter(
...	...	@@ -293,6 +299,14 @@ final class CaptureEngine {
293	299	fallbackDir: safeRoot)
294	300	}
295	301
	302	/// Channel count of an audio capture device's active format (1 for a typical
	303	/// built-in or USB mic), clamped to at least 1. Used to size the mic writer.
	304	private static func channelCount(of device: AVCaptureDevice) -> Int {
	305	guard let asbd = CMAudioFormatDescriptionGetStreamBasicDescription(
	306	device.activeFormat.formatDescription) else { return 1 }
	307	return max(1, Int(asbd.pointee.mChannelsPerFrame))
	308	}
	309
296	310	// MARK: AVCapture (mic + camera)
297	311
298	312	private func startAVCapture(audioUID: String? = nil, videoUID: String? = nil) throws {
...	...	@@ -307,7 +321,11 @@ final class CaptureEngine {
307	321	guard session.canAddInput(input) else { throw RecorderError("cannot add mic input") }
308	322	session.addInput(input)
309	323
310		let writer = try makeAudioWriter(name: "mic", kind: "mic")
	324	// Match the file's channel count to the device so a mono mic records as a
	325	// true mono file (which plays in both ears) rather than a stereo file with
	326	// a dead right channel. Falls back to mono if the format can't be read.
	327	let micChannels = Self.channelCount(of: device)
	328	let writer = try makeAudioWriter(name: "mic", kind: "mic", channels: micChannels)
311	329	writer.deviceUID = device.uniqueID
312	330	sinks.append(writer)
313	331

sequencer/CLAUDE.md+37-8

...	...	@@ -5,11 +5,14 @@ Sequencer ("Clover Sequencer") is a native macOS app, not a video editor. It hel
5	5	## Build & run
6	6
7	7	```sh
8		swift build # compile
9		./run.sh # build, kill running instance, copy binary into Sequencer.app, relaunch
	8	swift build # compile (debug — for the CLI harnesses below)
	9	./run.sh # build RELEASE, kill running instance, copy into Sequencer.app, relaunch
	10	./run.sh --debug # same but ship the debug build (crash-chasing only)
10	11	```
11	12
12		`run.sh` is the standard dev loop — it copies `.build/debug/Sequencer` into `Sequencer.app/Contents/MacOS/Sequencer` and reopens the app bundle (needed for a proper app identity/menu bar, not just a bare executable).
	13	`run.sh` is the standard dev loop — it copies the built binary into `Sequencer.app/Contents/MacOS/Sequencer` and reopens the app bundle (needed for a proper app identity/menu bar, not just a bare executable). It ships the `-c release` build by default: timeline drawing is ~4× slower under `-Onone`, and shipping debug binaries is how the app spent months feeling slower than it was. Judge any perf perception against release.
	14
	15	Launching the binary directly with `SEQ_DRAWPROF=1` in the environment (stderr to a file — NSLog is invisible under `open`) prints one `[drawprof]` line per second with draws/sec and mean/max ms per `TimelineView.draw` — the GUI-side counterpart to `--perftest`.
13	16
14	17	There is no test target in Package.swift. Verification instead happens through two CLI-flag-driven harnesses baked into `main.swift`:
15	18
...	...	@@ -17,11 +20,27 @@ There is no test target in Package.swift. Verification instead happens through t
17	20	swift run Sequencer --selftest <mediafile> # headless pipeline check (see Selftest.swift)
18	21	swift run Sequencer --uitest # offscreen TimelineView harness (see UITest.swift)
19	22	swift run Sequencer --perftest <file.sq> # offscreen draw-timing harness (see PerfTest.swift)
	23	swift run Sequencer --cachetest <file.sq> [capGB] # cache-budget invariant check (see Cachetest.swift)
20	24	```
21	25
22	26	- `--selftest` exercises the real media pipeline against a file you pass in: ffprobe, filmstrip/waveform generation, chunk-proxy building, AVFoundation playability of the built proxy, and prints sample Fusion Lua output. Useful when touching `MediaPipeline.swift` or `ChunkedProxy.swift`.
23	27	- `--uitest` hosts the real `TimelineView` in an offscreen window and drives it with synthetic `NSEvent`s (move, trim, slip, stretch, box select, split, links, storyboard split, comp parsing, fades, plus file-format migration/round-trip — ~100 assertions, PASS/FAIL printer). Useful when touching timeline gesture code.
24		- `--perftest` loads a real `.sq` into an offscreen `TimelineView` and times `draw(_:)` while simulating a horizontal pan, at several zoom levels, in both full-detail and simplified (mid-scroll) modes, printing ms/frame and a per-section breakdown (`DrawProf`). Use it when touching timeline drawing — it's how the per-clip draw cost was found. The lesson baked into `TimelineView`: never build/tint an `NSImage(systemSymbolName:)` per clip/element per frame (SF-symbol tinting does a `lockFocus` composite) — bake once via `bakedSymbol(...)`. Clip labels and filmstrips are also gated to at-rest / wide-enough via the `isScrolling` simplified path.
	28	- `--perftest` loads a real `.sq` into an offscreen `TimelineView` and times `draw(_:)` at several zoom levels, printing median and p90 ms/frame (medians resist the I/O spikes async thumbnail loads inject) plus a per-section `DrawProf` breakdown and tile blit/render counts. Each zoom is measured direct vs tiled, in the same process (thermal drift between runs otherwise swamps real deltas — this machine varies 5× with battery/heat), under two pan patterns: `scroll` (8 px/frame, a real gesture) and `jump` (half-project teleports, cache-hostile). Use it when touching timeline drawing. Lessons baked into `TimelineView`: never build/tint an `NSImage(systemSymbolName:)` per clip per frame — bake once via `bakedSymbol(...)`; never draw geometry millions of points wide (clamp to the cull window; CG "clips" it but pays anyway); and detail is a function of on-screen clip width (`lodMinWidth`), never of whether the user is scrolling.
	29	- `--cachetest` loads a real `.sq` (headless), jumps the playhead across the timeline, and continuously asserts the cache-budget invariant (`ledger ≤ cap`, disk ≤ cap + slack) while demand builds and evictions run — plus coverage of the chunk under the playhead at each stop. Use it when touching the budget/eviction logic in `MediaPipeline.swift` or `ChunkedProxy.swift`. Run it against a project whose full proxy set exceeds the cap (pass a small `capGB`) — that's the regime it exists to test. Don't run it while the GUI app is open (two processes would fight over one cache).
	30
	31	Cache/proxy debugging levers: `SEQ_BUILDLOG=1` logs every chunk-build START and admission failure (`[cache] start/admission blocked` — success completions are otherwise silent, so this is how you chase "why isn't chunk X building"). The viewer logs every "Loading Media…" spinner occurrence as a `[miss]` line with a cause diagnosis from `ChunkManager.missDiagnosis` (chunk missing/building/queued-where, composition-lag, player-late, budget-starved) and, on recovery, its duration. All `[miss]` lines and important `[cache]` events (rescues, build/stitch failures, admission blocks, orphan reaping) also append to `~/Library/Logs/Sequencer.log` (`SeqLog`, 5 MB rotation) — no Console attach or special launch needed; a user-reported spinner sighting is answerable from that file. `sequencer --layertest <cacheKey:origPath> […]` opens bare AVPlayerLayer tiles playing the real stitched composition(s) (`SEQ_LAYERTEST_T=<sec>` sets the seek) — the isolation tool that cracked the black-viewer bug.
	32
	33	Two hard-won playback failure modes (2026-07-11): (1) an `AVAssetTrack` does not retain its `AVURLAsset` — stitching a track whose asset has been deallocated fails with -11800/-12780, and under `try?` that silently left a black GAP in the composition for a chunk that was healthy on disk (`LoadedPart.asset` exists precisely to prevent this; `comp insert FAILED` in the log means it's back). (2) Orphaned ffmpeg encoders (app killed mid-build — run.sh pkills on every rebuild) hold VideoToolbox decode sessions from a machine-wide pool; a dozen accumulated orphans make every AVPlayer render black with zero errors anywhere (items ready, seeks land, `isReadyForDisplay` true). Defenses: `MediaPipeline.reapOrphans` kills stale ffmpegs referencing our cache at launch, `terminateChildren` runs on quit and SIGTERM/SIGINT, and run.sh sweeps strays.
	34
	35	Bundle id: `net.paperclover.Sequencer` (defaults domain too; renamed from com.clover.Sequencer 2026-07-12). Document UTI: `net.paperclover.sequencer.project` — keep `ProjectDocumentController.projectType` and build.sh's Info.plist in sync.
	36
	37	`ProjectModel.laneRefs` (and `hasStoryboard`) scan every clip — O(clips). Never call them per-clip in a draw or per-frame path: `laneRect→laneRefs` per drawn clip was quadratic and pegged a core at 98% on big projects. `TimelineView` uses its `laneRows` cache (invalidated in `redraw()`/`ctx.didSet`); route new hot paths through that.
	38
	39	Two hard-won main-thread rules (2026-07-12): (1) `URL(fileURLWithPath:)` without `isDirectory:` stats the path — `MediaItem.url`/`displayName` did this per clip label per timeline draw against NAS paths, freezing the UI whenever the volume was cold (292/337 draw samples in `stat()`). Always pass `isDirectory:` for known-file paths; `displayName` uses `(path as NSString).lastPathComponent` (no I/O). (2) Nothing between `thread_suspend` and `thread_resume` may allocate or lock — the hang sampler's `Array.append` needed the malloc lock the suspended main thread held → permanent app freeze (the "unusably laggy on startup" report). `sampleMainStack` uses preallocated buffers; keep it allocation-free. Related: the SIGTERM/SIGINT DispatchSources live on a background queue, not main — a wedged main thread must not make the app unkillable.
	40
	41	Microhangs/stutter: `HangMonitor` (a watchdog thread pinging the main queue every 20 ms) logs every main-thread stall >100 ms as a `[hang]` line in `~/Library/Logs/Sequencer.log` — duration, whether playback was running (`during playback (rate …)`), and a symbolicated stack of the main thread sampled mid-stall (mach `thread_suspend` + arm64 frame-pointer walk + `swift_demangle`), so the culprit is named without Instruments. `SEQ_NOHANGWATCH=1` disables it; `SEQ_HANGTEST=1` injects a deliberate 0.4 s spin ~2 s after launch to verify the pipeline end-to-end. User-reported stutter during long sessions is answerable from that file.
	42
	43	RAM: the `maxRAMGB` default (Settings → Global, default 2) budgets `FrameCache` — decoded exact stand-in frames for cut boundaries and not-yet-presentable moments (warmed ahead by `VideoTrackPlayer.warmBoundaryFrames`, on demand by the viewer; `SEQ_NOWARM=1` disables decodes) — and scales the video players' forward buffer (`ramGB/2` seconds, capped at 8).
25	44
26	45	Requires `ffmpeg`/`ffprobe` on PATH for anything touching media (probing, filmstrips, proxies).
27	46
...	...	@@ -48,7 +67,7 @@ Non-undoable session/UI state (track hide/focus, pane heights, laneScale, snappi
48	67
49	68	### Per-document architecture (`DocumentContext.swift`, `Document.swift`, `WindowController.swift`)
50	69
51		Each open project is a `ProjectDocument: NSDocument` owning a `DocumentContext` — the per-document service bag. Everything per-project is an instance on it: `ctx.store`, `ctx.playback`, `ctx.players`, `ctx.chunks`, `ctx.comps`, `ctx.boards`, `ctx.session`. Each service holds an `unowned var ctx` back-reference, so service-to-service calls go through `ctx.`. Views reach their state through a stored `var ctx` injected at construction (`SequencerWindowController` sets `timeline/viewer/transport`'s `ctx`; the grid injects its cells; the storyboard editor is re-targeted per `open(clipId:ctx:)`). Do not reach for a global `.shared` for per-project state* — only `MediaPipeline` (content-addressed media cache) and `Theme` are genuinely global. `DocumentContext.current` resolves the front document's context for app-level actions (Settings/Export/cache eviction); `DocumentContext.headless` backs the `--uitest`/`--selftest` harnesses.
	70	Each open project is a `ProjectDocument: NSDocument` owning a `DocumentContext` — the per-document service bag. Everything per-project is an instance on it: `ctx.store`, `ctx.playback`, `ctx.players`, `ctx.chunks`, `ctx.comps`, `ctx.boards`, `ctx.session`. Each service holds an `unowned var ctx` back-reference, so service-to-service calls go through `ctx.`. Because `ctx` is `unowned`, any service that lands an async callback (off-main chunk builds, the 60 Hz clock) must stop touching `ctx` once the document is closing* — `ProjectDocument.close()` calls `DocumentContext.shutdown()`, which flips `ChunkManager.stop()` / `PlaybackController.stop()` (both guard their ctx-touching entry points) before the context deallocs, so a build finishing after close can't trap on a dangling reference. Add the same guard to any new service that schedules deferred work. Views reach their state through a stored `var ctx` injected at construction (`SequencerWindowController` sets `timeline/viewer/transport`'s `ctx`; the grid injects its cells; the storyboard editor is re-targeted per `open(clipId:ctx:)`). Do not reach for a global `.shared` for per-project state — only `MediaPipeline` (content-addressed media cache) and `Theme` are genuinely global. `DocumentContext.current` resolves the front document's context for app-level actions (Settings/Export/cache eviction); `DocumentContext.headless` backs the `--uitest`/`--selftest` harnesses.
52	71
53	72	`SequencerWindowController` (one per window) owns the split layout, previews pop-out, and every per-document menu action (`@objc func`s targeting the first responder). `AppDelegate` is now slim: it builds the menu bar and handles app-level actions only (New/Open route to `NSDocumentController`; Save/Save As/Close to `NSDocument`).
54	73
...	...	@@ -59,7 +78,7 @@ Each open project is a `ProjectDocument: NSDocument` owning a `DocumentContext`
59	78	This is the most complex subsystem — a three-stage pipeline. `ChunkManager` and `PlaybackController`/`PlayerManager` are per-document (`ctx.chunks`, `ctx.playback`, `ctx.players`); `MediaPipeline` is the one global (a shared content-addressed cache):
60	79
61	80	1. `MediaPipeline` (`MediaPipeline.swift`) — wraps ffprobe/ffmpeg. Probes media, generates filmstrips (thumbnail strips) and waveforms async, LRU content-addressed cache (default 50GB). Cache key = `SHA256(path\|size\|mtime)`, so moved/remounted files with identical content still hit cache.
62		2. `ChunkManager` (`ChunkedProxy.swift`) — demand-driven 30-second ProRes Proxy chunks instead of whole-file transcodes. Build order is the whole game (`updateDemand` → `nextJob` → `pump`): every playback tick recomputes a best-first `demand` list from the playhead, playback direction, and visibility — for each video clip in a look-ahead window it scores the proxy chunks its source range needs (coverage before sharpening, visible/focused tracks before hidden, nearer the playhead in the playback direction before farther) so the frame you're about to see is always built first. Chunks outside the window fall to the whole-project background fill (`ensure`). Adaptive quality (4 resolution/fps tiers) steps down/up based on measured encode wall-time vs. realtime ratio and distinguishes network vs. encode bottlenecks; imminent coverage (uncovered, just ahead, visible) builds at that adaptive realtime quality so it lands in time, everything else at the full preview-quality target. Composes ready chunks + original-file fallback into a per-media `AVComposition` (`composition(for:)`), versioned so playback only swaps on a strict upgrade. Per-media (not per-track) is deliberate: only the clip under the playhead needs building, so the current frame is ready fast — a whole-track composition would have to assemble the entire timeline before it could show anything, which is far too slow for a big multicut project.
	81	2. `ChunkManager` (`ChunkedProxy.swift`) — demand-driven 30-second ProRes Proxy chunks instead of whole-file transcodes. Build order is the whole game (`updateDemand` → `nextJob` → `pump`): every playback tick recomputes a best-first `demand` list from the playhead, playback direction, and visibility — for each video clip in a look-ahead window it scores the proxy chunks its source range needs (coverage before sharpening, visible/focused tracks before hidden, nearer the playhead in the playback direction before farther) so the frame you're about to see is always built first. Chunks outside the window fall to the whole-project background fill (`ensure`). Adaptive quality (4 resolution/fps tiers) steps down/up based on measured encode wall-time vs. realtime ratio and distinguishes network vs. encode bottlenecks; imminent coverage (uncovered, just ahead, visible) builds at that adaptive realtime quality so it lands in time, everything else at the full preview-quality target. Rescue slices: when the playhead lands INSIDE an uncovered chunk, a short (~10 s) slice starting at the playhead builds first (`rNNNNNN.mov`, one quality rung lower) — read-bound NAS sources scale with encoded seconds, so this lands in a few seconds where quality drops can't help — then the full chunk builds right behind it and deletes the slice. Slice state (`MediaState.partial`) is session-only; stale slice files are purged by the launch reconcile. In queries: `isCovered` is true inside the slice's range, `builtWidths` reports a slice as width 1 (so the full build reads as a strict upgrade and the player adopts it), demand scoring still counts the chunk uncovered (so the full build stays queued). Trim/slip/ripple drags call `noteGestureExposure` mid-gesture so newly exposed source ranges build before mouse-up; committed edits warm the edited edge (`Store.noteEditLocus`). Composes ready chunks + rescue slices + original-file fallback into a per-media `AVComposition` (`composition(for:)`, chunk assets loaded concurrently), versioned so playback only swaps on a strict upgrade. Per-media (not per-track) is deliberate: only the clip under the playhead needs building, so the current frame is ready fast — a whole-track composition would have to assemble the entire timeline before it could show anything, which is far too slow for a big multicut project.
63	82	3. `PlaybackController` + `PlayerManager` (`PlaybackController.swift`) — master clock anchored to `CACurrentMediaTime()`; all players chase this one authoritative time at 60Hz. Supports reverse and J/K/L shuttle speeds (±1/2/4/8/16/32/64). Each video track is a `VideoTrackPlayer`: two `AVPlayer`s (front/back) for gapless cuts. The front shows the clip under the playhead (`currentTime` == source time, chasing at `rate × clip.speed`); as a cut to a different media approaches (~1.5 s out) the back is prerolled to the next clip's first frame — loaded, decoded, parked, muted — and at the cut the roles flip. The viewer's cell holds two `AVPlayerLayer`s (one bound to each sub-player, stable) and just toggles which is visible, so the flip is a layer swap with no `replaceCurrentItem` black-frame gap. Same-media continuations don't buffer (the front keeps its item and seeks). `tick()` runs `sync()` (which does the flip) before posting `.playheadChanged`, so the viewer reflects the flip on the same frame. Standalone `.audio` clips get one `AVPlayer` per clip (looser sync tolerance since originals live on NAS); a clip's player is prerolled ~1 s before its cut and kept running (silent — its fade gain is 0 until reached), so crossing an audio cut is a seamless volume handover rather than a cold start — see `audioLookahead`/`audioLinger` in `syncAudio`. Item swaps hold the fresh item silent (`rate = 0`) until the immediately-following `syncTime` seeks it to the live position, so a swap never blips wrong content from t=0. `.projectChanged` forces a hard resync only while paused — during playback the 60 Hz tick already tracks, so edits away from the playhead don't stutter. Seeks coalesce while one is in-flight.
64	83
65	84	When working on playback bugs, the mental model is: `MediaPipeline` produces cached derived assets → `ChunkManager` decides what to build (playhead/visibility-ordered) and assembles per-media compositions → `PlaybackController` drives the players (a double-buffered pair per video track, one per audio clip) against those compositions on a shared clock. Two levers make cuts gapless: the build order gets the next clip's proxy ready ahead of time, and the double buffer prerolls it and flips without an item swap.
...	...	@@ -71,11 +90,21 @@ When working on playback bugs, the mental model is: `MediaPipeline` produces cac
71	90
72	91	### Storyboard (`Storyboard.swift`, `StoryboardEditor.swift`)
73	92
74		Each `Board` has two layers: a shape (vector) layer stored in the model (`BoardShape` — rect/oval/triangle/star/n-gon/text/image-ref) and a raster (drawing) layer stored as a PNG on disk keyed by board ID. `revision`/version counters invalidate the composite cache independent of model-mutation equality (raster edits don't go through `Store.mutate`). Panels are "start-only" in the model — see `normalizeStoryboards()` above.
	93	Each `Board` has two layers: a shape (vector) layer stored in the model (`BoardShape` — rect/oval/triangle/star/n-gon/text/image-ref) and a raster (drawing) layer stored as a PNG on disk keyed by board ID. `revision`/version counters invalidate the composite cache independent of model-mutation equality (raster pixels live in `BoardStore`, out of the value-type model). Drawing IS undoable and shares ONE timeline with model edits: `BoardStore.beginStroke`/`endStroke` capture the pre-stroke image and register it via `Store.recordRasterEdit`, so the `Store` undo stack holds both `.model(Snapshot)` and `.raster(boardId, image)` entries in the order they happened — ⌘Z/⌘⇧Z step through drawing and model edits together, from any window, and drawing redoes like everything else (undo/redo of a raster entry swaps the current drawing for the stored one via `BoardStore.rasterSnapshot`/`applyRaster`). Panels are "start-only" in the model — see `normalizeStoryboards()` above.
75	94
76	95	### Views
77	96
78		- `TimelineView.swift` — largest file (~2700 lines); all editing gestures (move/trim/slip/stretch/box-select/split/blade) live here, each gesture wrapped in one `Store` undo step.
	97	- `TimelineView.swift` — largest file (~3500 lines); all editing gestures (move/trim/slip/stretch/box-select/split/blade) live here, each gesture wrapped in one `Store` undo step.
	98
	99	Timeline rendering is built around one rule: frame cost is proportional to what changed, not what's visible, and the look never degrades — a 4,740-clip project draws pixel-identically to a 10-clip one. Three mechanisms:
	100	1. Pixel-width LOD (`drawClip`, `lodMinWidth`): a clip narrower than ~3 px physically can't show corners/labels/filmstrips, so it draws as flat rects (body + strip + audio center line + fade-handle slivers) — no bezier/clip-state chrome. This replaced the old `lightScroll` shed-detail-mid-scroll mode, which visibly dropped thumbnails yet saved almost nothing.
	101	2. Scene tile cache (`blitLaneTiles`/`tileImage`): lane clip content rasterizes into per-(lane × 512 pt slice) `CGImage` tiles in timeline space (origin-independent), rendered by the same `drawLaneClips` code as the direct path — pixel-equivalent by construction. Pan/playback frames are blits + chrome (~15 ms at fit-all on a throttled M4; was ~500 ms). Pin-to-view-edge labels are an overlay (`drawPinnedLabels`), never baked. Origin/scrollY/lane heights are quantized to the device-pixel grid so blits never resample. Tiles are BGRA in the window's colorspace (an `NSBitmapImageRep` source costs a per-blit swizzle+conversion). Renders are budgeted (`tileRendersPerFrame`) with pixel-identical direct fallback + a scheduled fill pass; big origin jumps render zero tiles that frame. Edit gestures bypass tiles entirely. `SEQ_NOTILES=1` forces the direct path.
	102	3. Targeted invalidation: `.projectChanged`/`.viewOptionsChanged` → scene regroup + tile flush; `.selectionChanged` → link-mate cache + tile flush only; `.mediaStatusChanged` flushes tiles only when posted with `userInfo["scene"]` (filmstrip/waveform/board raster landed — `MediaPipeline`/`BoardStore` posts carry it) — proxy-chunk churn during playback repaints without re-rendering. Keep that convention when adding posts.
	103	4. Parallel cold frames (`drawLanesDirectParallel`): zoom-in-flight, teleport jumps, and live edit gestures can't use tiles, so those frames rasterize every lane concurrently into persistent per-lane buffers (same `drawLaneClips` code, composited on main; the storyboard lane stays on main — `BoardStore` isn't locked). Anything `drawLaneClips` touches must therefore be thread-safe under concurrent reads: the scene caches are read-only during a draw; `MediaPipeline`'s thumb/waveform/strip-info bookkeeping, `bakedSymbol`, and the CTLine title cache are lock-guarded; `DrawProf` only records on the main thread. `NSGraphicsContext.current` is thread-local, but `concurrentPerform` runs one iteration on the calling thread — save/restore it, never nil it.
	104
	105	Image assets that the timeline blits per frame (filmstrip thumbs, waveforms) are decoded once into the display's raster format via `MediaPipeline.displayImage` (BGRA premultiplied, screen colorspace) and returned as `CGImage` — a file-format NSImage costs a per-draw swizzle + colorspace conversion. Misses are negatively cached (`thumbMissing`/`waveformMissing`) so a dense timeline doesn't re-dispatch hundreds of no-op loads per frame; the miss sets clear when fresh strips/waveforms land.
	106
	107	Model-side lookups that draw or hit-test against clips go through the scene caches (`clipsByLane` sorted per lane + binary-searched `visibleIndexRange`, `overlapsByLane`, `overlapIdsByLane`, `cachedTimelineDuration`) — never `project.clips.filter(...)` per frame/event; `Model.overlaps()` relies on its sorted early-`break` to stay near-linear.
79	108	- `ViewerGridView.swift` — multicam grid, one cell per visible track plus a Fusion comps cell.
80	109	- `TransportBar.swift`, `ExportDialog.swift`, `ColorPicker.swift`, `Theme.swift` (light/dark, follows system appearance, no manual toggle), `Tools.swift` (tool enum + radial quick-picker).
81	110

sequencer/Deltarune Ch5.sq/project.json deleted-11285

...	...	@@ -1,11285 +0,0 @@
1		{
2		"formatVersion" : 2,
3		"project" : {
4		"boardHeight" : 1080,
5		"boardWidth" : 1920,
6		"clips" : [
7		{
8		"duration" : 8.779661016949152,
9		"fadeIn" : 0,
10		"fadeOut" : 0,
11		"id" : "0856AA33-6A7E-4E96-BFB1-7B40DCC5C3E2",
12		"kind" : "video",
13		"linkId" : "E4929B8D-EE5B-4B9D-850D-B43F8A803E7A",
14		"mediaId" : "26CBEF77-6850-4D82-A5BD-A6A37587C040",
15		"muted" : false,
16		"newShot" : false,
17		"speed" : 1,
18		"srcIn" : 0.8026453438086703,
19		"start" : 0,
20		"track" : "v0"
21		},
22		{
23		"duration" : 8.779661016949152,
24		"fadeIn" : 0,
25		"fadeOut" : 0,
26		"id" : "F03A433A-DD0D-43A4-B2E0-77976661B8D5",
27		"kind" : "audio",
28		"linkId" : "E4929B8D-EE5B-4B9D-850D-B43F8A803E7A",
29		"mediaId" : "F676BA7D-A0E0-4603-AE13-B853D2F9F2BB",
30		"muted" : true,
31		"newShot" : false,
32		"speed" : 1,
33		"srcIn" : 0.9509002194553415,
34		"start" : 0,
35		"track" : "v1"
36		},
37		{
38		"duration" : 8.779661016949152,
39		"fadeIn" : 0,
40		"fadeOut" : 0,
41		"id" : "DDC04C1A-94A8-4F4D-9568-73F07B3E0304",
42		"kind" : "audio",
43		"linkId" : "E4929B8D-EE5B-4B9D-850D-B43F8A803E7A",
44		"mediaId" : "6FFA3786-8E51-4E69-A15D-D6A991C0CCAD",
45		"muted" : false,
46		"newShot" : false,
47		"speed" : 1,
48		"srcIn" : 1.2881355932203389,
49		"start" : 0,
50		"track" : "v2"
51		},
52		{
53		"duration" : 8.779661016949152,
54		"fadeIn" : 0,
55		"fadeOut" : 0,
56		"id" : "856D7E40-8EF3-4242-AB37-B26CBFD4B3F7",
57		"kind" : "video",
58		"linkId" : "E4929B8D-EE5B-4B9D-850D-B43F8A803E7A",
59		"mediaId" : "609E978E-5994-4757-A6C7-EAAE72818A49",
60		"muted" : false,
61		"newShot" : false,
62		"speed" : 1,
63		"srcIn" : 0.8603196774655755,
64		"start" : 0,
65		"track" : "v3"
66		},
67		{
68		"duration" : 8.779661016949152,
69		"fadeIn" : 0,
70		"fadeOut" : 0,
71		"id" : "ACBD774E-FC95-41F4-B5FB-037577828AD9",
72		"kind" : "video",
73		"linkId" : "E4929B8D-EE5B-4B9D-850D-B43F8A803E7A",
74		"mediaId" : "C0E05C14-2D32-4A55-9041-7A752A97F6B1",
75		"muted" : false,
76		"newShot" : false,
77		"speed" : 1,
78		"srcIn" : 0.8603078854665893,
79		"start" : 0,
80		"track" : "v4"
81		},
82		{
83		"duration" : 9.288135593220339,
84		"fadeIn" : 0,
85		"fadeOut" : 0,
86		"id" : "21E55168-059F-4CFC-AF14-FF43F7E7A9F8",
87		"kind" : "video",
88		"linkId" : "7ADB32D0-2D02-491A-8BF7-11F6A47A354E",
89		"mediaId" : "26CBEF77-6850-4D82-A5BD-A6A37587C040",
90		"muted" : false,
91		"newShot" : false,
92		"speed" : 1,
93		"srcIn" : 11.582306360757823,
94		"start" : 8.779661016949152,
95		"track" : "v0"
96		},
97		{
98		"duration" : 9.288135593220339,
99		"fadeIn" : 0,
100		"fadeOut" : 0,
101		"id" : "FA932A03-4AEE-428C-9593-EB3CFA09BEBE",
102		"kind" : "audio",
103		"linkId" : "7ADB32D0-2D02-491A-8BF7-11F6A47A354E",
104		"mediaId" : "F676BA7D-A0E0-4603-AE13-B853D2F9F2BB",
105		"muted" : true,
106		"newShot" : false,
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11235		"path" : "\/Volumes\/clover\/Archive\/2026\/Journal\/2026-07-04_17.30\/screen-2.mov",
11236		"width" : 3840
11237		}
11238		],
11239		"preferredTakes" : [
11240
11241		],
11242		"tracks" : [
11243		{
11244		"hue" : 0
11245		},
11246		{
11247		"hue" : 0.6180339887498949
11248		},
11249		{
11250		"hue" : 0.2360679774997898
11251		},
11252		{
11253		"hue" : 0.8541019662496847
11254		},
11255		{
11256		"hue" : 0.4721359549995796
11257		}
11258		]
11259		},
11260		"view" : {
11261		"focusedTracks" : [
11262
11263		],
11264		"fusionFocus" : false,
11265		"fusionHidden" : false,
11266		"hiddenTracks" : [
11267
11268		],
11269		"laneScale" : 1.5562744140625,
11270		"previewsOnLeft" : false,
11271		"priorityPane" : "v4",
11272		"showFilmstrips" : true,
11273		"snapping" : true,
11274		"trackHeights" : [
11275		{
11276		"factor" : 0.99639892578125,
11277		"track" : "v0"
11278		},
11279		{
11280		"factor" : 1,
11281		"track" : "v4"
11282		}
11283		]
11284		}
11285		}
		\ No newline at end of file

sequencer/Sources/Sequencer/AppDelegate.swift+7

...	...	@@ -52,6 +52,13 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
52	52	/// (Fusion-feeding) workflow.
53	53	func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool { true }
54	54
	55	/// In-flight ffmpeg encodes must die with the app: orphans hold shared
	56	/// VideoToolbox decode sessions, and a few accumulated ones make every
	57	/// AVPlayer in the NEXT instance render black (see MediaPipeline).
	58	func applicationWillTerminate(_ notification: Notification) {
	59	MediaPipeline.terminateChildren()
	60	}
	61
55	62	/// On launch, reopen the most recent project instead of a blank untitled
56	63	/// one; fall back to a fresh untitled document when there's no history.
57	64	func applicationOpenUntitledFile(_ sender: NSApplication) -> Bool {

sequencer/Sources/Sequencer/Cachetest.swift created+132

...	...	@@ -0,0 +1,132 @@
	1	import Foundation
	2
	3	/// Headless cache-budget check: `sequencer --cachetest <file.sq> [capGB]`.
	4	///
	5	/// Loads the real project into the headless context, jumps the playhead to
	6	/// several spots spread across the timeline, and lets demand builds +
	7	/// evictions run at each stop while continuously asserting the invariant
	8	/// that makes the cap a hard ceiling:
	9	///
	10	/// ledger + reserved ≤ cap (checked every second)
	11	/// bytes on disk ≤ cap + slack (checked every few seconds)
	12	///
	13	/// At each stop it also waits for the chunk under the playhead to become
	14	/// covered — proving the system optimizes around where the user is even when
	15	/// the whole project can't fit (the "Deltarune problem").
	16	func runCacheTest(path: String, capGB: Int) {
	17	func spin(_ seconds: Double) {
	18	RunLoop.main.run(until: Date().addingTimeInterval(seconds))
	19	}
	20
	21	print("== Sequencer cachetest ==")
	22	if capGB > 0 { UserDefaults.standard.set(capGB, forKey: "maxCacheGB") }
	23	let pipeline = MediaPipeline.shared
	24	let cap = pipeline.maxCacheBytes
	25	print("cache: \(pipeline.cacheRoot.path)")
	26	print(String(format: "cap: %.1f GB", Double(cap) / 1e9))
	27
	28	// Load the project (package or legacy flat file) into the headless context.
	29	let url = URL(fileURLWithPath: path)
	30	var jsonURL = url
	31	var isDir: ObjCBool = false
	32	if FileManager.default.fileExists(atPath: url.path, isDirectory: &isDir), isDir.boolValue {
	33	jsonURL = url.appendingPathComponent("project.json")
	34	}
	35	guard let data = try? Data(contentsOf: jsonURL),
	36	let doc = try? JSONDecoder().decode(SequencerDocument.self, from: data) else {
	37	print("FAIL: cannot read project at \(path)")
	38	return
	39	}
	40	let ctx = DocumentContext.headless
	41	ctx.store.adopt(doc.project)
	42	let project = ctx.store.project
	43	let span = project.clips.map(\.end).max() ?? 0
	44	print(String(format: "project: %d clips, %d media, %.0f s timeline",
	45	project.clips.count, project.media.count, span))
	46
	47	// Wait for the launch reconcile so admission is open.
	48	let bootDeadline = Date().addingTimeInterval(60)
	49	while !pipeline.budgetReady && Date() < bootDeadline { spin(0.1) }
	50	guard pipeline.budgetReady else { print("FAIL: ledger reconcile timed out"); return }
	51
	52	// Playhead stops: spread across the timeline, snapped to the midpoint of a
	53	// real video clip so there is always something to cover.
	54	var stops: [Double] = []
	55	for frac in [0.05, 0.35, 0.65, 0.9] {
	56	let t = span * frac
	57	if let clip = project.clips
	58	.filter({ $0.kind == .video })
	59	.min(by: { abs(($0.start + $0.end) / 2 - t) < abs(($1.start + $1.end) / 2 - t) }) {
	60	let mid = (clip.start + clip.end) / 2
	61	if !stops.contains(where: { abs($0 - mid) < 60 }) { stops.append(mid) }
	62	}
	63	}
	64
	65	var failures = 0
	66	var walkTick = 0
	67	func checkInvariant(_ label: String) {
	68	let held = pipeline.ledgerBytes <= cap
	69	if !held {
	70	failures += 1
	71	print(String(format: "FAIL: ledger %.2f GB over cap (%@)",
	72	Double(pipeline.ledgerBytes) / 1e9, label))
	73	}
	74	// The disk walk is the ground truth the ledger approximates. Slack
	75	// covers unbudgeted small writes (filmstrips) between reconciles.
	76	walkTick += 1
	77	if walkTick % 5 == 0 {
	78	let disk = MediaPipeline.directorySize(pipeline.cacheRoot)
	79	if disk > cap + 500_000_000 {
	80	failures += 1
	81	print(String(format: "FAIL: %.2f GB on disk exceeds cap (%@)",
	82	Double(disk) / 1e9, label))
	83	}
	84	}
	85	}
	86
	87	for (i, t) in stops.enumerated() {
	88	print(String(format: "\n-- stop %d: playhead %.0f s", i + 1, t))
	89	ctx.playback.seek(to: t)
	90	ctx.chunks.ensure(for: project)
	91	ctx.chunks.updateDemand(force: true)
	92	let clipsHere = project.clips.filter {
	93	$0.kind == .video && $0.start <= t && t < $0.end
	94	}
	95	let deadline = Date().addingTimeInterval(150)
	96	var covered = false
	97	var announced = false
	98	while Date() < deadline {
	99	spin(1.0)
	100	checkInvariant("stop \(i + 1)")
	101	var missing: [String] = []
	102	for clip in clipsHere {
	103	guard let media = project.media(clip.mediaId) else { continue }
	104	let src = clip.srcIn + (t - clip.start) * clip.speed
	105	if !ctx.chunks.isCovered(media: media, sourceTime: src)
	106	&& !ctx.chunks.buildFailed(media: media, sourceTime: src) {
	107	missing.append("\(media.cacheKey.prefix(8))#\(ChunkManager.chunkIndex(forSource: src))")
	108	}
	109	}
	110	covered = missing.isEmpty
	111	if covered { break }
	112	if !announced {
	113	announced = true
	114	NSLog("[cachetest] stop %d waiting on: %@", i + 1,
	115	missing.joined(separator: " "))
	116	}
	117	}
	118	print(String(format: "coverage at playhead: %@ (ledger %.2f GB)",
	119	covered ? "OK" : "FAIL (not covered in 150s)",
	120	Double(pipeline.ledgerBytes) / 1e9))
	121	if !covered { failures += 1 }
	122	}
	123
	124	// Let any in-flight builds settle, then final ground-truth comparison.
	125	spin(5)
	126	let disk = MediaPipeline.directorySize(pipeline.cacheRoot)
	127	print(String(format: "\nfinal: ledger %.2f GB, disk %.2f GB, cap %.1f GB",
	128	Double(pipeline.ledgerBytes) / 1e9, Double(disk) / 1e9,
	129	Double(cap) / 1e9))
	130	if disk > cap + 500_000_000 { failures += 1; print("FAIL: final disk size over cap") }
	131	print(failures == 0 ? "\n== cachetest PASS ==" : "\n== cachetest FAIL (\(failures)) ==")
	132	}

sequencer/Sources/Sequencer/ChunkedProxy.swift+874-110

...	...	@@ -36,11 +36,18 @@ final class ChunkManager {
36	36	/// fixed 960 until the viewer measures itself.
37	37	private(set) var previewTargetWidth = 960
38	38
	39	/// Hard upper bound on proxy resolution: 1080p-wide. A proxy only has to be
	40	/// sharp enough to edit against, not master from — and a 4K source is ~8×
	41	/// the pixels (and cache bytes) of 1080p for detail an editing preview can't
	42	/// use. (It also caps content that was cheaply up-scaled to 4K — e.g. 800×600
	43	/// gameplay blown up to 4K — back to a size that reflects its real detail.)
	44	static let maxProxyWidth = 1920
	45
39	46	/// The width a fresh proxy for this media should reach — the preview target,
40		/// never upscaled past the source.
	47	/// never upscaled past the source, and never above the 1080p cap.
41	48	private func targetWidth(for media: MediaItem) -> Int {
42	49	let native = media.width > 0 ? media.width : previewTargetWidth
43		return min(native, previewTargetWidth)
	50	return min(native, previewTargetWidth, Self.maxProxyWidth)
44	51	}
45	52
46	53	/// Effective encode width at `level` for this media (even, ffmpeg-friendly).
...	...	@@ -50,9 +57,28 @@ final class ChunkManager {
50	57	return max(160, w - (w % 2))
51	58	}
52	59
	60	/// Whether a chunk already on disk at width `built` should be re-encoded:
	61	/// either it's below the current sharpness target (sharpen up toward it), or
	62	/// it's above the hard 1080p cap (a legacy 4K proxy to shrink back down — the
	63	/// cap is constant, so this converges and never churns on window resize). The
	64	/// `attempted` guard stops a failed re-encode from looping.
	65	private func needsReencode(built: Int, attempted: Int?, target: Int) -> Bool {
	66	if built < target { return (attempted ?? 0) < target }
	67	if built > Self.maxProxyWidth { return (attempted ?? built) > Self.maxProxyWidth }
	68	return false
	69	}
	70
	71	/// A short "rescue" slice standing in for a chunk the playhead landed on
	72	/// cold: only `dur` seconds starting `offset` into the chunk's grid slot
	73	/// exist on disk (as `rNNNNNN.mov`). Session-only — never persisted; stale
	74	/// slice files from a crash are purged by the launch reconcile walk.
	75	struct Rescue { let offset: Double; let dur: Double; let width: Int }
	76
53	77	private struct MediaState {
54	78	var built: [Int: Int] = [:] // chunk index → effective width on disk
55	79	var attempted: [Int: Int] = [:] // chunk index → width of the last attempt
	80	var partial: [Int: Rescue] = [:] // chunk index → rescue slice on disk
	81	var rescueAttempted: Set<Int> = []
56	82	var inFlight: Set<Int> = []
57	83	var failed: Set<Int> = []
58	84	var urgent: [Int] = []
...	...	@@ -79,6 +105,18 @@ final class ChunkManager {
79	105	/// queue is retained, resuming where it left off. Main-thread only.
80	106	private(set) var isPaused = false
81	107
	108	/// Set when the owning document closes. In-flight builds run off-main and
	109	/// their completions land back on main; a completion (via `pump`) reaches
	110	/// `ctx`, which is `unowned` and may already be gone once the document is
	111	/// torn down. `stopped` makes every ctx-touching entry point a no-op, so a
	112	/// build finishing after close can't trap on a dangling context.
	113	private var stopped = false
	114	func stop() {
	115	stopped = true
	116	geometryPending?.cancel()
	117	geometryPending = nil
	118	}
	119
82	120	/// Toggle proxy optimization on/off (driven by the status-bar readout).
83	121	func setPaused(_ paused: Bool) {
84	122	guard paused != isPaused else { return }
...	...	@@ -110,9 +148,7 @@ final class ChunkManager {
110	148	init() {
111	149	NotificationCenter.default.addObserver(
112	150	forName: .projectChanged, object: nil, queue: .main) { [weak self] _ in
113		guard let self else { return }
114		self.ensure(for: self.ctx.store.project)
115		self.updateDemand(force: true)
	151	self?.scheduleRebuild()
116	152	}
117	153	// Hiding/focusing a track changes what to optimize first.
118	154	NotificationCenter.default.addObserver(
...	...	@@ -121,6 +157,26 @@ final class ChunkManager {
121	157	}
122	158	}
123	159
	160	private var geometryPending: DispatchWorkItem?
	161	/// Coalesce project-geometry rebuilds. During a continuous drag
	162	/// `.projectChanged` fires ~60×/s; rebuilding the whole background queue each
	163	/// time is pure waste — moving a clip in TIME doesn't change which source
	164	/// chunks it needs. Debounce so the queue rebuilds once the edit settles.
	165	/// (Initial load calls `ensure` directly via `startServices`, and playback
	166	/// refreshes demand every tick, so nothing waits on this.)
	167	private func scheduleRebuild() {
	168	guard !stopped else { return }
	169	geometryPending?.cancel()
	170	let w = DispatchWorkItem { [weak self] in
	171	guard let self, !self.stopped else { return }
	172	self.geometryPending = nil
	173	self.ensure(for: self.ctx.store.project)
	174	self.updateDemand(force: true)
	175	}
	176	geometryPending = w
	177	DispatchQueue.main.asyncAfter(deadline: .now() + 0.12, execute: w)
	178	}
	179
124	180	// MARK: - Paths
125	181
126	182	private func chunksDir(_ key: String) -> URL {
...	...	@@ -135,6 +191,9 @@ final class ChunkManager {
135	191	private func chunkURL(key: String, index: Int) -> URL {
136	192	chunksDir(key).appendingPathComponent(String(format: "c%06d.mov", index))
137	193	}
	194	private func rescueURL(key: String, index: Int) -> URL {
	195	chunksDir(key).appendingPathComponent(String(format: "r%06d.mov", index))
	196	}
138	197	private func manifestURL(_ key: String) -> URL {
139	198	chunksDir(key).appendingPathComponent("widths.json")
140	199	}
...	...	@@ -172,6 +231,15 @@ final class ChunkManager {
172	231	var s = states[media.cacheKey] ?? MediaState()
173	232	if !s.scanned {
174	233	s.scanned = true
	234	// Cold big network media starts the realtime ladder two rungs
	235	// down: the first urgent (playhead) build must land in seconds,
	236	// and a full-target encode of 4K source rarely does — the
	237	// adaptive controller would only learn that AFTER the user
	238	// stared at a placeholder. It climbs back once builds measure
	239	// comfortably fast; background upgrades restore full quality.
	240	if media.width >= 2560, Self.isNetworkPath(media.path) {
	241	s.qualityIndex = 2
	242	}
175	243	let widths = loadWidths(media.cacheKey)
176	244	if let names = try? FileManager.default
177	245	.contentsOfDirectory(atPath: chunksDir(media.cacheKey).path) {
...	...	@@ -205,28 +273,113 @@ final class ChunkManager {
205	273	guard s.urgent != wanted else { return }
206	274	s.urgent = wanted
207	275	states[media.cacheKey] = s
	276	windowStarved = false // fresh urgency → re-attempt admission
	277	pump()
	278	}
	279
	280	/// A live trim/slip drag is exposing this source moment at a clip edge —
	281	/// start building its chunk (and the neighbor in the drag direction)
	282	/// BEFORE mouse-up, so a newly extended range is covered by the time the
	283	/// user plays across it. Cheap and self-deduping; safe to call per drag
	284	/// tick.
	285	func noteGestureExposure(media: MediaItem, sourceTime: Double, direction: Int) {
	286	guard !stopped, media.duration > 0, !media.isAudio, !hasFullProxy(media) else { return }
	287	var s = state(for: media)
	288	let n = Self.chunkCount(duration: media.duration)
	289	let i = min(n - 1, max(0, Self.chunkIndex(forSource: sourceTime)))
	290	let wanted = [i, i + (direction < 0 ? -1 : 1)].filter {
	291	$0 >= 0 && $0 < n && s.built[$0] == nil
	292	&& !s.inFlight.contains($0) && !s.failed.contains($0)
	293	}
	294	guard s.urgent != wanted else { return }
	295	s.urgent = wanted
	296	states[media.cacheKey] = s
	297	windowStarved = false // fresh urgency → re-attempt admission
208	298	pump()
209	299	}
210	300
211	301	/// Rebuild the background fill queue from the project: every chunk in
212		/// every clip's used source range, in order.
	302	/// every clip's used source range. Cut heads first (the first chunk of
	303	/// every clip is the landing pad for clip-to-clip navigation — a sliver
	304	/// of the bytes for most of the "timeline feels instant" effect), then
	305	/// everything else; both passes nearest-the-playhead first, so the fill
	306	/// grows the working set outward instead of marching from t=0.
213	307	func ensure(for project: ProjectModel) {
	308	guard !stopped else { return }
	309	let ph = ctx.playback.playhead
214	310	for media in project.media {
215	311	guard media.duration > 0, !media.isAudio, !hasFullProxy(media) else { continue }
216	312	var s = state(for: media)
217	313	let n = Self.chunkCount(duration: media.duration)
218		var order: [Int] = []
	314	var heads: [(i: Int, d: Double)] = []
	315	var rest: [(i: Int, d: Double)] = []
	316	var seen = Set<Int>()
219	317	for clip in project.clips where clip.mediaId == media.id {
220	318	let a = min(n - 1, Self.chunkIndex(forSource: clip.srcIn))
221	319	let b = min(n - 1, Self.chunkIndex(forSource: clip.srcIn + clip.duration - 0.001))
222		for i in a...max(a, b) where !order.contains(i) { order.append(i) }
	320	let d = abs(clip.start - ph)
	321	for i in a...max(a, b) where seen.insert(i).inserted {
	322	if i == a { heads.append((i, d)) } else { rest.append((i, d)) }
	323	}
223	324	}
224		s.background = order
	325	heads.sort { $0.d < $1.d }
	326	rest.sort { $0.d < $1.d }
	327	s.background = heads.map(\.i) + rest.map(\.i)
225	328	states[media.cacheKey] = s
226	329	}
	330	// Geometry changed: clips removed from the timeline may have freed
	331	// evictable chunks, so a starved fill is worth one more attempt.
	332	fillStarved = false
	333	// The scan above is also what makes this document's chunks visible as
	334	// eviction candidates. If the cache is over cap (launch reconcile ran
	335	// before any document had scanned — nothing was evictable then), this
	336	// is the moment eviction can actually see the cold chunks: re-check.
	337	MediaPipeline.shared.evictIfNeeded()
227	338	pump()
228	339	}
229	340
	341	// MARK: - Edit locus
	342
	343	/// Timeline positions of recent edits, oldest first. Editors scrub and
	344	/// re-play around where they're cutting, so chunks near these positions
	345	/// build early and evict late. Fed by `Store` after each committed edit;
	346	/// entries expire after ~15 minutes.
	347	private var editLoci: [(time: Double, at: Date)] = []
	348
	349	func noteEdits(times: [Double]) {
	350	guard !stopped, !times.isEmpty else { return }
	351	let now = Date()
	352	for t in times {
	353	if let i = editLoci.firstIndex(where: { abs($0.time - t) < 30 }) {
	354	editLoci[i] = (t, now)
	355	} else {
	356	editLoci.append((t, now))
	357	}
	358	}
	359	if editLoci.count > 8 { editLoci.removeFirst(editLoci.count - 8) }
	360	updateDemand(force: true)
	361	}
	362
	363	/// Loci still fresh enough to matter.
	364	private func activeEditLoci() -> [Double] {
	365	let cutoff = Date().addingTimeInterval(-15 * 60)
	366	editLoci.removeAll { $0.at < cutoff }
	367	return editLoci.map(\.time)
	368	}
	369
	370	/// The timeline window the user can currently SEE (when zoomed in enough
	371	/// to be meaningful) — scrubbing happens inside it. Set by TimelineView.
	372	private func visibleWindow() -> ClosedRange<Double>? {
	373	guard let r = ctx.session.visibleTimeRange,
	374	r.upperBound - r.lowerBound <= 600 else { return nil }
	375	return r
	376	}
	377
	378	/// Distance from a timeline interval to a point (0 when inside).
	379	private static func dist(_ t: Double, _ lo: Double, _ hi: Double) -> Double {
	380	t < lo ? lo - t : (t > hi ? t - hi : 0)
	381	}
	382
230	383	// MARK: - Prefetch demand (what to optimize first)
231	384
232	385	private struct DemandKey: Hashable { let key: String; let index: Int }
...	...	@@ -237,6 +390,9 @@ final class ChunkManager {
237	390	/// build at the adaptive realtime quality so they land in time; everything
238	391	/// else builds at the full preview-quality target.
239	392	private var demandImminent: Set<DemandKey> = []
	393	/// Uncovered chunks the playhead is sitting INSIDE right now, mapped to the
	394	/// source time being shown — the trigger (and anchor) for rescue slices.
	395	private var demandRescue: [DemandKey: Double] = [:]
240	396	private var lastDemandPlayhead = -1e9
241	397	private var lastDemandSign = 0.0
242	398
...	...	@@ -249,14 +405,16 @@ final class ChunkManager {
249	405	private static let imminentAhead = 45.0
250	406
251	407	/// Recompute the build order — the heart of "optimize the right thing first."
252		/// For every video clip near the playhead we score the proxy chunks its
	408	/// For every video clip near an ANCHOR we score the proxy chunks its
253	409	/// source range needs and sort them: coverage before sharpening, visible
254		/// (and focused) tracks before hidden, and nearer the playhead in the
255		/// playback direction before farther. Chunks outside the window fall through
256		/// to the whole-project background queue (`ensure`). Cheap; safe to call as
257		/// the playhead moves (self-throttled).
	410	/// (and focused) tracks before hidden, and nearer the anchor before
	411	/// farther. Anchors, hottest first: the playhead (direction-weighted),
	412	/// recent edit sites, and the visible timeline window — the places the
	413	/// user is most likely to play next. Chunks outside every window fall
	414	/// through to the whole-project background queue (`ensure`). Cheap; safe
	415	/// to call as the playhead moves (self-throttled).
258	416	func updateDemand(force: Bool = false) {
259		guard ctx != nil else { return }
	417	guard !stopped else { return }
260	418	let ph = ctx.playback.playhead
261	419	let sign = ctx.playback.rate < 0 ? -1.0 : 1.0
262	420	guard force \|\| abs(ph - lastDemandPlayhead) > 1.5 \|\| sign != lastDemandSign else { return }
...	...	@@ -267,48 +425,97 @@ final class ChunkManager {
267	425	let dir = sign
268	426	let anyFocused = !ctx.session.focusedTracks.isEmpty
269	427
	428	// Secondary anchors: recent edit sites, then the visible window.
	429	// Their bias keeps them strictly behind playhead-window work but far
	430	// ahead of the whole-project background fill.
	431	struct Window { let lo: Double; let hi: Double; let anchor: Double; let bias: Double }
	432	var windows = [Window(lo: ph - (dir > 0 ? Self.prefetchBehind : Self.prefetchAhead),
	433	hi: ph + (dir > 0 ? Self.prefetchAhead : Self.prefetchBehind),
	434	anchor: ph, bias: 0)]
	435	for l in activeEditLoci() {
	436	windows.append(Window(lo: l - 45, hi: l + 45, anchor: l, bias: 2_000))
	437	}
	438	if let vis = visibleWindow() {
	439	windows.append(Window(lo: vis.lowerBound, hi: vis.upperBound,
	440	anchor: (vis.lowerBound + vis.upperBound) / 2, bias: 6_000))
	441	}
	442
270	443	struct Cand { let key: DemandKey; let score: Double; let imminent: Bool }
271	444	var cands: [Cand] = []
	445	var rescue: [DemandKey: Double] = [:]
272	446	for clip in project.clips where clip.kind == .video {
273	447	guard let media = project.media(clip.mediaId), media.duration > 0,
274	448	!media.isAudio, !hasFullProxy(media) else { continue }
275	449	let visible = !ctx.session.hiddenTracks.contains(clip.track)
276	450	let focused = ctx.session.focusedTracks.contains(clip.track)
277		let lo = ph - (dir > 0 ? Self.prefetchBehind : Self.prefetchAhead)
278		let hi = ph + (dir > 0 ? Self.prefetchAhead : Self.prefetchBehind)
279		let a = max(clip.start, lo), b = min(clip.end, hi)
280		guard b > a else { continue }
281		let n = Self.chunkCount(duration: media.duration)
282		let s = state(for: media)
283		let target = targetWidth(for: media)
284		let srcA = clip.srcIn + (a - clip.start) * clip.speed
285		let srcB = clip.srcIn + (b - clip.start) * clip.speed
286		let ci = min(n - 1, Self.chunkIndex(forSource: min(srcA, srcB)))
287		let cj = min(n - 1, Self.chunkIndex(forSource: max(srcA, srcB) - 1e-6))
288		for idx in ci...max(ci, cj) {
289		if (s.built[idx] ?? 0) >= target { continue } // already good enough
290		let covered = s.built[idx] != nil
291		// Timeline moment this chunk's content plays inside this clip.
292		let tl = clip.start
293		+ (Double(idx) * Self.chunkSeconds - clip.srcIn) / max(1e-4, clip.speed)
294		let signed = (min(max(tl, a), b) - ph) * dir // >0 = ahead
295		var score = signed >= 0 ? signed : -signed * 4 // behind costs 4×
296		if covered { score += 10_000 } // coverage beats sharpening
297		if !visible { score += 100_000 } // hidden tracks last
298		else if anyFocused && !focused { score += 1_000 } // the enlarged pane first
299		let imminent = visible && !covered && signed >= 0 && signed < Self.imminentAhead
300		cands.append(Cand(key: DemandKey(key: media.cacheKey, index: idx),
301		score: score, imminent: imminent))
	451	var n = 0, target = 0
	452	var s: MediaState?
	453	for w in windows {
	454	let a = max(clip.start, w.lo), b = min(clip.end, w.hi)
	455	guard b > a else { continue }
	456	if s == nil { // lazy: only scan media that some window needs
	457	s = state(for: media)
	458	n = Self.chunkCount(duration: media.duration)
	459	target = targetWidth(for: media)
	460	}
	461	guard let st = s else { continue }
	462	let srcA = clip.srcIn + (a - clip.start) * clip.speed
	463	let srcB = clip.srcIn + (b - clip.start) * clip.speed
	464	let ci = min(n - 1, Self.chunkIndex(forSource: min(srcA, srcB)))
	465	let cj = min(n - 1, Self.chunkIndex(forSource: max(srcA, srcB) - 1e-6))
	466	for idx in ci...max(ci, cj) {
	467	if (st.built[idx] ?? 0) >= target { continue } // already good enough
	468	let covered = st.built[idx] != nil
	469	// Timeline interval this chunk's content plays inside this
	470	// clip. Scoring by the INTERVAL (not the chunk's start
	471	// moment) is what puts the chunk UNDER the playhead at
	472	// score 0 — its start is always "behind", and treating it
	473	// that way made the builder prefetch a dozen ahead-chunks
	474	// while the user stared at "Loading Media…" on the frame
	475	// they'd actually landed on.
	476	let t0 = clip.start
	477	+ (Double(idx) * Self.chunkSeconds - clip.srcIn) / max(1e-4, clip.speed)
	478	let t1 = clip.start
	479	+ (Double(idx + 1) * Self.chunkSeconds - clip.srcIn) / max(1e-4, clip.speed)
	480	let cLo = max(min(t0, t1), a), cHi = min(max(t0, t1), b)
	481	let isPlayhead = w.bias == 0
	482	var score: Double
	483	var under = false
	484	if isPlayhead {
	485	let ahead = dir > 0 ? cLo - ph : ph - cHi // >0 = strictly ahead
	486	let behind = dir > 0 ? ph - cHi : cLo - ph // >0 = strictly behind
	487	under = ahead <= 0 && behind <= 0 // playing right now
	488	score = ahead > 0 ? ahead : (behind > 0 ? behind * 4 : 0)
	489	} else {
	490	score = w.bias + max(0, max(cLo - w.anchor, w.anchor - cHi))
	491	}
	492	if covered { score += 10_000 } // coverage beats sharpening
	493	if !visible { score += 100_000 } // hidden tracks last
	494	else if anyFocused && !focused { score += 1_000 } // the enlarged pane first
	495	let ahead = dir > 0 ? cLo - ph : ph - cHi
	496	let imminent = isPlayhead && visible && !covered
	497	&& (under \|\| (ahead >= 0 && ahead < Self.imminentAhead))
	498	let dk = DemandKey(key: media.cacheKey, index: idx)
	499	if isPlayhead, visible, under, !covered {
	500	rescue[dk] = clip.srcIn + (ph - clip.start) * clip.speed
	501	}
	502	cands.append(Cand(key: dk, score: score, imminent: imminent))
	503	}
302	504	}
303	505	}
304	506	cands.sort { $0.score < $1.score }
	507	let oldDemand = demand
305	508	demand.removeAll(keepingCapacity: true)
306	509	demandImminent.removeAll(keepingCapacity: true)
	510	demandRescue = rescue
307	511	var seen = Set<DemandKey>()
308	512	for c in cands where seen.insert(c.key).inserted {
309	513	demand.append(c.key)
310	514	if c.imminent { demandImminent.insert(c.key) }
311	515	}
	516	// The window moved: what starved before may fit now (different chunks,
	517	// and colder ones may have fallen out of the protected radius).
	518	if demand != oldDemand { windowStarved = false }
312	519	pump()
313	520	}
314	521
...	...	@@ -318,7 +525,13 @@ final class ChunkManager {
318	525	if media.isAudio { return true } // audio plays the original directly
319	526	if hasFullProxy(media) { return true }
320	527	let s = state(for: media)
321		return s.built[Self.chunkIndex(forSource: sourceTime)] != nil
	528	let i = Self.chunkIndex(forSource: sourceTime)
	529	if s.built[i] != nil { return true }
	530	if let p = s.partial[i] { // a rescue slice covers only part of the slot
	531	let t = sourceTime - Double(i) * Self.chunkSeconds
	532	return t >= p.offset - 0.05 && t <= p.offset + p.dur - 0.05
	533	}
	534	return false
322	535	}
323	536
324	537	/// Last known answer; unknown kicks the async composition build (which
...	...	@@ -330,6 +543,196 @@ final class ChunkManager {
330	543	return false
331	544	}
332	545
	546	// MARK: - Cache budget (admission + eviction support)
	547
	548	/// Set when a build was skipped because the cache is at its cap and
	549	/// nothing colder could be evicted to make room. `window` covers the
	550	/// playhead prefetch; `fill` the whole-project background queue. Cleared
	551	/// whenever the budget or the demand changes.
	552	private var windowStarved = false
	553	private var fillStarved = false
	554	/// The cache is full and optimization is deliberately not building
	555	/// everything — drives the status-bar messaging.
	556	var budgetStarved: Bool { windowStarved \|\| fillStarved }
	557
	558	/// The global cache budget moved (reconcile finished, eviction freed
	559	/// space, cap changed): try again from a clean slate.
	560	func budgetChanged() {
	561	guard !stopped else { return }
	562	windowStarved = false
	563	fillStarved = false
	564	pump()
	565	}
	566
	567	/// `SEQ_BUILDLOG=1`: log every build START and admission failure — the
	568	/// queue's decisions, not just its results. For chasing "why isn't chunk
	569	/// X building" (success completions are otherwise silent).
	570	static let buildLog = ProcessInfo.processInfo.environment["SEQ_BUILDLOG"] != nil
	571
	572	/// Global correction factor: measured chunk bytes ÷ raw estimate, EMA'd.
	573	/// Starts at 1 (the raw model is a ProRes-proxy ballpark) and converges on
	574	/// the actual footage within a few chunks.
	575	private static var chunkRateEMA = 1.0
	576
	577	/// Ballpark bytes for a chunk at `width` before correction: ProRes proxy
	578	/// ≈ 0.09 bytes per pixel per frame, plus PCM audio when present.
	579	/// `seconds` overrides the encoded duration (rescue slices).
	580	private func rawChunkEstimate(media: MediaItem, width: Int, index: Int,
	581	seconds: Double? = nil) -> Double {
	582	let dur = seconds ?? min(Self.chunkSeconds,
	583	max(1, media.duration - Double(index) * Self.chunkSeconds))
	584	let aspect = (media.width > 0 && media.height > 0)
	585	? Double(media.height) / Double(media.width) : 9.0 / 16
	586	let fps = min(60.0, max(10.0, media.fps))
	587	var b = 0.09 * Double(width) * (Double(width) * aspect) * fps * dur
	588	if media.hasAudio { b += 200_000 * dur }
	589	return b
	590	}
	591
	592	/// Corrected + safety-margined estimate the admission gate reserves.
	593	private func estimateChunkBytes(media: MediaItem, width: Int, index: Int,
	594	seconds: Double? = nil) -> Int64 {
	595	Int64(rawChunkEstimate(media: media, width: width, index: index, seconds: seconds)
	596	* Self.chunkRateEMA * 1.3)
	597	}
	598
	599	/// A cold, already-built chunk the global cache may delete to make room.
	600	struct EvictionCandidate {
	601	let key: String
	602	let index: Int
	603	let url: URL
	604	/// Timeline seconds from this document's playhead to the nearest use
	605	/// of the chunk; 1e12 when no clip uses it at all (media edited off
	606	/// the timeline — the coldest bytes there are).
	607	let coldness: Double
	608	}
	609
	610	/// Timeline distance within which built chunks are HARD-protected: the
	611	/// frames playback will hit imminently. Everything beyond is merely
	612	/// ranked by distance — evictable coldest-first — so when the working set
	613	/// alone exceeds the cap, it shrinks to fit instead of wedging eviction.
	614	private static let hardProtectRadius = 60.0
	615
	616	/// Every built chunk of this document that eviction MAY delete, scored by
	617	/// coldness (timeline distance from the playhead; off-timeline chunks are
	618	/// coldest). Hard-excluded: the demand window, anything mid-build or
	619	/// urgent, and chunks within `hardProtectRadius` of the playhead — which
	620	/// for a background window is exactly its resume neighborhood.
	621	func evictionCandidates() -> [EvictionCandidate] {
	622	guard !stopped else { return [] }
	623	let project = ctx.store.project
	624	let ph = ctx.playback.playhead
	625	var protected: Set<DemandKey> = Set(demand)
	626	for (key, s) in states {
	627	for i in s.inFlight { protected.insert(DemandKey(key: key, index: i)) }
	628	for i in s.urgent { protected.insert(DemandKey(key: key, index: i)) }
	629	}
	630	// Score every chunk any clip uses by its distance from the nearest
	631	// heat anchor (playhead, then recent edit sites and the visible
	632	// window at a penalty so the playhead wins ties); hard-protect only
	633	// the playhead-imminent ones. Cut heads read as 4× closer than they
	634	// are, so the "instant timeline" landing pads die last.
	635	let loci = activeEditLoci()
	636	let vis = visibleWindow()
	637	var distance: [DemandKey: Double] = [:]
	638	var heads: Set<DemandKey> = []
	639	for clip in project.clips where clip.kind == .video {
	640	guard let media = project.media(clip.mediaId), media.duration > 0,
	641	!media.isAudio else { continue }
	642	let n = Self.chunkCount(duration: media.duration)
	643	let a = min(n - 1, Self.chunkIndex(forSource: clip.srcIn))
	644	let b = min(n - 1, Self.chunkIndex(forSource: clip.srcIn + clip.duration - 0.001))
	645	heads.insert(DemandKey(key: media.cacheKey, index: a))
	646	for i in a...max(a, b) {
	647	let t0 = clip.start + (Double(i) * Self.chunkSeconds - clip.srcIn) / max(1e-4, clip.speed)
	648	let t1 = clip.start + (Double(i + 1) * Self.chunkSeconds - clip.srcIn) / max(1e-4, clip.speed)
	649	let lo = max(clip.start, min(t0, t1)), hi = min(clip.end, max(t0, t1))
	650	var d = Self.dist(ph, lo, hi)
	651	for l in loci { d = min(d, Self.dist(l, lo, hi) + 60) }
	652	if let vis { // gap between the chunk's interval and the visible range
	653	let gap = max(0, max(lo - vis.upperBound, vis.lowerBound - hi))
	654	d = min(d, gap + 120)
	655	}
	656	let dk = DemandKey(key: media.cacheKey, index: i)
	657	distance[dk] = min(distance[dk] ?? .infinity, d)
	658	if Self.dist(ph, lo, hi) < Self.hardProtectRadius { protected.insert(dk) }
	659	}
	660	}
	661	var out: [EvictionCandidate] = []
	662	var builtTotal = 0
	663	for (key, s) in states {
	664	builtTotal += s.built.count
	665	for i in s.built.keys {
	666	let dk = DemandKey(key: key, index: i)
	667	guard !protected.contains(dk), !s.inFlight.contains(i) else { continue }
	668	var coldness = distance[dk] ?? 1e12
	669	if heads.contains(dk) { coldness *= 0.25 } // landing pads die last
	670	out.append(EvictionCandidate(key: key, index: i,
	671	url: chunkURL(key: key, index: i),
	672	coldness: coldness))
	673	}
	674	// Rescue slices are evictable like any chunk (the playhead radius
	675	// protects the live one); they just live in an rNNNNNN.mov file.
	676	for i in s.partial.keys where s.built[i] == nil {
	677	let dk = DemandKey(key: key, index: i)
	678	guard !protected.contains(dk), !s.inFlight.contains(i) else { continue }
	679	out.append(EvictionCandidate(key: key, index: i,
	680	url: rescueURL(key: key, index: i),
	681	coldness: distance[dk] ?? 1e12))
	682	}
	683	}
	684	NSLog("[cache] candidates: %d of %d built chunks (%d protected, playhead %.0fs)",
	685	out.count, builtTotal, protected.count, ph)
	686	return out
	687	}
	688
	689	/// The global cache deleted these chunk files: drop them from state and
	690	/// bump the version so compositions rebuild onto the original-file
	691	/// fallback instead of pointing at deleted movs.
	692	func noteEvicted(key: String, indices: [Int]) {
	693	guard var s = states[key] else { return }
	694	var changed = false
	695	for i in indices {
	696	if s.built.removeValue(forKey: i) != nil {
	697	s.attempted.removeValue(forKey: i)
	698	changed = true
	699	}
	700	if s.partial.removeValue(forKey: i) != nil { changed = true }
	701	}
	702	guard changed else { return }
	703	s.version += 1
	704	states[key] = s
	705	persistWidths(key: key)
	706	}
	707
	708	/// Chunk states for the timeline's optimization strip — one cheap value
	709	/// snapshot per media per strip rebuild. nil when the media hasn't been
	710	/// scanned yet (unknown; the strip paints it as unoptimized until the
	711	/// initial `ensure` pass scans it).
	712	struct StripSnapshot {
	713	let n: Int
	714	let target: Int
	715	let built: [Int: Int]
	716	let inFlight: Set<Int>
	717	let partial: Set<Int>
	718	let failed: Set<Int>
	719	let fullProxy: Bool
	720	}
	721
	722	func stripSnapshot(media: MediaItem) -> StripSnapshot? {
	723	guard media.duration > 0, !media.isAudio else { return nil }
	724	if hasFullProxy(media) {
	725	return StripSnapshot(n: 1, target: 0, built: [:], inFlight: [],
	726	partial: [], failed: [], fullProxy: true)
	727	}
	728	guard let s = states[media.cacheKey], s.scanned else { return nil }
	729	return StripSnapshot(n: Self.chunkCount(duration: media.duration),
	730	target: targetWidth(for: media),
	731	built: s.built, inFlight: s.inFlight,
	732	partial: Set(s.partial.keys), failed: s.failed,
	733	fullProxy: false)
	734	}
	735
333	736	/// (building now, waiting in queue) across all media — for the status bar.
334	737	/// A chunk counts as queued while it's either missing OR still below the
335	738	/// preview-quality target (i.e. an upgrade is pending).
...	...	@@ -348,8 +751,14 @@ final class ChunkManager {
348	751
349	752	/// Per-chunk proxy width right now (players record this at item-swap time
350	753	/// to judge whether a later swap upgrades the frame under the playhead).
	754	/// Rescue slices report as width 1: "something is there", and any full
	755	/// build over them reads as a strict upgrade so the player adopts it.
351	756	func builtWidths(media: MediaItem) -> [Int: Int] {
352		state(for: media).built
	757	let s = state(for: media)
	758	guard !s.partial.isEmpty else { return s.built }
	759	var w = s.built
	760	for i in s.partial.keys where w[i] == nil { w[i] = 1 }
	761	return w
353	762	}
354	763
355	764	func builtChunkURL(media: MediaItem, index: Int) -> URL? {
...	...	@@ -357,53 +766,181 @@ final class ChunkManager {
357	766	? chunkURL(key: media.cacheKey, index: index) : nil
358	767	}
359	768
	769	/// A playable (file, time-in-file) pair that shows `sourceTime` — the
	770	/// sharpest thing on disk right now: legacy full proxy, built chunk,
	771	/// covering rescue slice, or the original when it's known playable. nil
	772	/// when this frame genuinely can't be decoded yet. Feeds the RAM frame
	773	/// cache's stand-in decodes; main-thread.
	774	func frameSource(media: MediaItem, sourceTime: Double) -> (url: URL, time: Double)? {
	775	guard !media.isAudio else { return nil }
	776	if let proxy = MediaPipeline.shared.proxyURL(for: media) {
	777	return (proxy, sourceTime)
	778	}
	779	let s = state(for: media)
	780	let i = Self.chunkIndex(forSource: sourceTime)
	781	let local = sourceTime - Double(i) * Self.chunkSeconds
	782	if s.built[i] != nil {
	783	return (chunkURL(key: media.cacheKey, index: i), local)
	784	}
	785	if let p = s.partial[i], local >= p.offset, local <= p.offset + p.dur - 0.05 {
	786	return (rescueURL(key: media.cacheKey, index: i), local - p.offset)
	787	}
	788	if s.originalPlayable == true { return (media.url, sourceTime) }
	789	return nil
	790	}
	791
	792	/// Rough bytes this project needs to be FULLY optimized — every chunk any
	793	/// clip uses, at the current preview target width — and how many bytes its
	794	/// media already have on disk. Estimates use the same corrected model as
	795	/// the admission gate (sans safety margin); `built` is a real disk walk of
	796	/// each media's chunk dir, so call this on demand (Settings), not per frame.
	797	func optimizeEstimate(for project: ProjectModel) -> (total: Int64, built: Int64) {
	798	var total: Int64 = 0, built: Int64 = 0
	799	for media in project.media where !media.isAudio && media.duration > 0 {
	800	if hasFullProxy(media), let proxy = MediaPipeline.shared.proxyURL(for: media) {
	801	let sz = (try? FileManager.default.attributesOfItem(atPath: proxy.path)[.size]
	802	as? NSNumber)?.int64Value ?? 0
	803	total += sz
	804	built += sz
	805	continue
	806	}
	807	let n = Self.chunkCount(duration: media.duration)
	808	var used = Set<Int>()
	809	for clip in project.clips where clip.mediaId == media.id && clip.kind == .video {
	810	let a = min(n - 1, Self.chunkIndex(forSource: clip.srcIn))
	811	let b = min(n - 1, Self.chunkIndex(forSource: clip.srcIn + clip.duration - 0.001))
	812	for i in a...max(a, b) { used.insert(i) }
	813	}
	814	guard !used.isEmpty else { continue }
	815	let target = targetWidth(for: media)
	816	for i in used {
	817	total += Int64(rawChunkEstimate(media: media, width: target, index: i)
	818	* Self.chunkRateEMA)
	819	}
	820	built += MediaPipeline.directorySize(chunksDir(media.cacheKey))
	821	}
	822	return (total, built)
	823	}
	824
	825	/// One-line explanation of why the frame at `sourceTime` might not be
	826	/// showing — the [miss] log's payload. Every "Loading Media…" spinner the
	827	/// viewer escalates to gets one of these, so a spinner sighting is
	828	/// diagnosable from the log instead of a shrug: was the chunk missing
	829	/// entirely (and did the demand scorer even know about it?), mid-build,
	830	/// built-but-not-yet-stitched, or built with the player just late?
	831	func missDiagnosis(media: MediaItem, sourceTime: Double) -> String {
	832	guard !media.isAudio else { return "audio" }
	833	guard !hasFullProxy(media) else { return "full-proxy player-late" }
	834	let s = state(for: media)
	835	let i = Self.chunkIndex(forSource: sourceTime)
	836	var bits = ["\(media.cacheKey.prefix(8))#\(i)"]
	837	if let w = s.built[i] {
	838	bits.append("built(w=\(w))")
	839	bits.append(s.compositionVersion != s.version ? "composition-lag"
	840	: "player-late")
	841	} else if let p = s.partial[i] {
	842	let t = sourceTime - Double(i) * Self.chunkSeconds
	843	bits.append(String(format: "rescue(%.0fs@%.0fs t=%.1f)", p.dur, p.offset, t))
	844	bits.append(s.compositionVersion != s.version ? "composition-lag"
	845	: "player-late")
	846	} else if s.inFlight.contains(i) {
	847	bits.append("building")
	848	} else if s.failed.contains(i) {
	849	bits.append("build-failed")
	850	} else {
	851	let dk = DemandKey(key: media.cacheKey, index: i)
	852	if let rank = demand.firstIndex(of: dk) {
	853	bits.append("queued(demand#\(rank)\(demandImminent.contains(dk) ? " imminent" : ""))")
	854	} else if s.background.contains(i) {
	855	bits.append("queued(background)") // demand window missed it
	856	} else {
	857	bits.append("NOT-QUEUED") // heuristic gap — the bad one
	858	}
	859	}
	860	if budgetStarved { bits.append("budget-starved") }
	861	if isPaused { bits.append("opt-paused") }
	862	if s.originalPlayable == nil { bits.append("orig-unknown") }
	863	else if s.originalPlayable == false { bits.append("orig-unplayable") }
	864	return bits.joined(separator: " ")
	865	}
	866
	867	/// The proxy chunk covering `sourceTime` tried to build and hard-failed
	868	/// (both encoders) with nothing usable — the viewer surfaces this instead of
	869	/// spinning "processing…" forever.
	870	func buildFailed(media: MediaItem, sourceTime: Double) -> Bool {
	871	if media.isAudio \|\| hasFullProxy(media) { return false }
	872	return state(for: media).failed.contains(Self.chunkIndex(forSource: sourceTime))
	873	}
	874
360	875	// MARK: - Build queue
361	876
	877	/// Which budget tier a job builds for. `window` jobs (playhead prefetch,
	878	/// urgent coverage) may evict cold chunks of open documents to make room;
	879	/// `fill` jobs (whole-project background) may only consume free budget or
	880	/// space freed from closed projects — never evict another chunk. That
	881	/// asymmetry is what makes the cache converge instead of thrash: a build
	882	/// can only displace bytes strictly colder than itself.
	883	private enum JobTier { case window, fill }
	884
362	885	/// Next chunk to build, in priority order:
363	886	/// 0. urgent — coverage the playhead needs NOW, at any quality;
364	887	/// 1. missing — background chunks not yet built at all (coverage first);
365	888	/// 2. upgrade — background chunks built below the preview-quality target.
366	889	/// Coverage always beats sharpening, so playback never stalls waiting on a
367	890	/// quality upgrade of a frame that's already visible.
368		private func nextJob() -> (media: MediaItem, index: Int, urgent: Bool)? {
	891	private func nextJob(frontDoc: Bool) -> (media: MediaItem, index: Int, urgent: Bool, tier: JobTier)? {
	892	// Only the frontmost document builds proxies. macOS state restoration
	893	// reopens every previously-open project on launch; if each one built its
	894	// proxies, they'd transcode their full ProRes sets in parallel. Every open
	895	// project's media counts as "in use", so eviction can't reclaim any of it —
	896	// the shared cache blows past its cap and fills the disk (the reported bug).
	897	// A background project builds nothing until you switch to it (its window
	898	// becoming main re-pumps it — see windowDidBecomeMain); the document under
	899	// the playhead is always the front one, so playback is unaffected.
	900	guard frontDoc else { return nil }
369	901	// 1. Prefetch demand — already ordered best-first (visible/focused, near,
370	902	// coverage before sharpening). Coverage rides the adaptive realtime
371	903	// quality when imminent; an upgrade goes for the full target.
372		for dk in demand {
373		guard let media = mediaByKey[dk.key] else { continue }
374		let s = states[dk.key] ?? state(for: media)
375		guard !s.inFlight.contains(dk.index), !s.failed.contains(dk.index) else { continue }
376		let target = targetWidth(for: media)
377		if let have = s.built[dk.index] {
378		if have < target, (s.attempted[dk.index] ?? 0) < target {
379		return (media, dk.index, false) // upgrade → target
	904	if !windowStarved {
	905	for dk in demand {
	906	guard let media = mediaByKey[dk.key] else { continue }
	907	let s = states[dk.key] ?? state(for: media)
	908	guard !s.inFlight.contains(dk.index), !s.failed.contains(dk.index) else { continue }
	909	let target = targetWidth(for: media)
	910	if let have = s.built[dk.index] {
	911	if needsReencode(built: have, attempted: s.attempted[dk.index], target: target) {
	912	return (media, dk.index, false, .window) // sharpen or shrink → target
	913	}
	914	} else {
	915	return (media, dk.index, demandImminent.contains(dk), .window) // coverage
380	916	}
381		} else {
382		return (media, dk.index, demandImminent.contains(dk)) // coverage
383	917	}
384		}
385		// 2. Legacy urgent (headless `want`) then the whole-project background
386		// fill for chunks off-screen of the prefetch window.
387		for (key, s) in states {
388		guard let media = mediaByKey[key] else { continue }
389		for i in s.urgent where s.built[i] == nil
390		&& !s.inFlight.contains(i) && !s.failed.contains(i) {
391		return (media, i, true)
	918	// 2. Legacy urgent (headless `want`).
	919	for (key, s) in states {
	920	guard let media = mediaByKey[key] else { continue }
	921	for i in s.urgent where s.built[i] == nil
	922	&& !s.inFlight.contains(i) && !s.failed.contains(i) {
	923	return (media, i, true, .window)
	924	}
392	925	}
393	926	}
	927	// 3. Whole-project background fill for chunks off-screen of the
	928	// prefetch window — the tier that stops when the cache is full.
	929	guard !fillStarved else { return nil }
394	930	for (key, s) in states {
395	931	guard let media = mediaByKey[key] else { continue }
396	932	for i in s.background where s.built[i] == nil
397	933	&& !s.inFlight.contains(i) && !s.failed.contains(i) {
398		return (media, i, false)
	934	return (media, i, false, .fill)
399	935	}
400	936	}
401	937	for (key, s) in states {
402	938	guard let media = mediaByKey[key] else { continue }
403	939	let target = targetWidth(for: media)
404	940	for i in s.background where !s.inFlight.contains(i) {
405		if let have = s.built[i], have < target, (s.attempted[i] ?? 0) < target {
406		return (media, i, false)
	941	if let have = s.built[i],
	942	needsReencode(built: have, attempted: s.attempted[i], target: target) {
	943	return (media, i, false, .fill)
407	944	}
408	945	}
409	946	}
...	...	@@ -411,40 +948,161 @@ final class ChunkManager {
411	948	}
412	949
413	950	private func pump() {
	951	guard !stopped else { return } // document closing — don't touch ctx
414	952	// Paused stops idle background fill, but playback still optimizes the
415	953	// chunks it's about to need.
	954	// Only the front document runs its whole-project background fill (see
	955	// nextJob) — this is the guard that stops N restored projects transcoding
	956	// their full proxy sets in parallel and overflowing the cache.
	957	let frontDoc = DocumentContext.current === ctx
416	958	while (!isPaused \|\| ctx.playback.isPlaying),
417		activeBuilds < maxBuilds, let job = nextJob() {
418		// During playback keep one slot free for urgent coverage so a slow
419		// background quality-upgrade can't stall the frames being played.
420		if !job.urgent, ctx.playback.isPlaying, activeBuilds >= maxBuilds - 1 { break }
421		let (media, index, urgent) = job
	959	activeBuilds < maxBuilds + 1, let job = nextJob(frontDoc: frontDoc) {
	960	// URGENT coverage (the playhead just landed on/near this chunk) may
	961	// take one OVERFLOW slot: a couple of minutes-long 4K background
	962	// encodes must never wall off the frame the user is looking at —
	963	// that wait was the last reproducible "Loading Media…" spinner.
	964	// Everything else respects maxBuilds, and during playback keeps one
	965	// slot free for urgent coverage on top.
	966	if !job.urgent {
	967	if activeBuilds >= maxBuilds { break }
	968	if ctx.playback.isPlaying, activeBuilds >= maxBuilds - 1 { break }
	969	}
	970	let (media, index, urgent, tier) = job
	971	// RESCUE: the playhead is sitting on this uncovered chunk right
	972	// now. A full 30-second encode makes the user wait for content
	973	// they're already staring at — so first land a short slice
	974	// starting AT the playhead (read-bound NAS sources scale with
	975	// encoded seconds, so this is fast even when quality drops
	976	// aren't), then immediately re-queue the full chunk behind it.
	977	var slice: (offset: Double, dur: Double)? = nil
	978	let dk = DemandKey(key: media.cacheKey, index: index)
	979	if urgent, let st = states[media.cacheKey], st.built[index] == nil,
	980	st.partial[index] == nil, !st.rescueAttempted.contains(index),
	981	let srcT = demandRescue[dk] {
	982	let chunkStart = Double(index) * Self.chunkSeconds
	983	let content = min(Self.chunkSeconds, media.duration - chunkStart)
	984	let offset = min(max(0, (srcT - chunkStart - 1).rounded(.down)),
	985	max(0, content - 2))
	986	let dur = min(Self.rescueSeconds, content - offset)
	987	// Only worth two encodes when the slice is a real shortcut.
	988	if dur >= 4, dur <= content - offset, dur < content * 0.7 {
	989	slice = (offset, dur)
	990	}
	991	}
422	992	// Urgent builds ride the adaptive realtime level; background builds
423		// go for the full preview-quality target.
424		let level = urgent ? (states[media.cacheKey]?.qualityIndex ?? 0) : 0
	993	// go for the full preview-quality target. A rescue slice drops one
	994	// more rung — landing NOW is its whole purpose.
	995	var level = urgent ? (states[media.cacheKey]?.qualityIndex ?? 0) : 0
	996	if slice != nil { level = min(Self.qualities.count - 1, level + 1) }
425	997	let width = buildWidth(level: level, media: media)
426	998	let fpsDiv = Self.qualities[min(max(0, level), Self.qualities.count - 1)].fpsDivisor
427	999	let fps = max(1, Int((media.fps / Double(fpsDiv)).rounded()))
	1000	// Admission gate: the cap is enforced BEFORE bytes hit the disk.
	1001	// No reservation, no build — first try to make room by evicting
	1002	// strictly-colder bytes (closed projects for any tier; open
	1003	// documents' cold chunks only for window builds), and if nothing
	1004	// colder exists, this tier starves until the budget changes.
	1005	let est = estimateChunkBytes(media: media, width: width, index: index,
	1006	seconds: slice?.dur)
	1007	let ceiling = tier == .window ? MediaPipeline.shared.maxCacheBytes
	1008	: MediaPipeline.shared.lowWatermarkBytes
	1009	if !MediaPipeline.shared.tryReserve(bytes: est, upTo: ceiling) {
	1010	if Self.buildLog {
	1011	SeqLog.log("[cache] admission blocked %@#%d est=%.0fMB tier=%@",
	1012	String(media.cacheKey.prefix(8)), index,
	1013	Double(est) / 1e6, tier == .window ? "window" : "fill")
	1014	}
	1015	// Try to make room by evicting strictly-colder bytes: closed
	1016	// projects' dirs for any tier; open documents' cold chunks
	1017	// only for window builds (fill must never displace a chunk —
	1018	// it stops at the watermark instead, which is what keeps
	1019	// fill and eviction from fighting over the same bytes).
	1020	MediaPipeline.shared.evictToFit(need: est, openDocChunks: tier == .window,
	1021	upTo: ceiling) { [weak self] ok in
	1022	guard let self, !self.stopped, !ok else { return }
	1023	// Eviction couldn't free enough (or one is already running
	1024	// — resolved via budgetChanged when it lands): starve the
	1025	// tier so pump stops retrying until the budget moves.
	1026	if tier == .window { self.windowStarved = true }
	1027	else { self.fillStarved = true }
	1028	NotificationCenter.default.post(name: .mediaStatusChanged, object: nil)
	1029	}
	1030	break
	1031	}
428	1032	states[media.cacheKey]?.inFlight.insert(index)
429		states[media.cacheKey]?.attempted[index] = width
	1033	if slice == nil {
	1034	states[media.cacheKey]?.attempted[index] = width
	1035	} else {
	1036	states[media.cacheKey]?.rescueAttempted.insert(index)
	1037	}
430	1038	activeBuilds += 1
	1039	if Self.buildLog {
	1040	SeqLog.log("[cache] start %@#%d w=%d urgent=%d tier=%@%@",
	1041	String(media.cacheKey.prefix(8)), index, width, urgent ? 1 : 0,
	1042	tier == .window ? "window" : "fill",
	1043	slice != nil ? " rescue" : "")
	1044	}
431	1045	DispatchQueue.global(qos: .userInitiated).async { [self] in
432		let r = buildChunk(media: media, index: index, width: width, fps: fps)
	1046	let r = buildChunk(media: media, index: index, width: width, fps: fps,
	1047	slice: slice)
433	1048	DispatchQueue.main.async {
	1049	if !r.ok {
	1050	SeqLog.log("[cache] build FAILED %@#%d w=%d%@",
	1051	String(media.cacheKey.prefix(8)), index, width,
	1052	slice != nil ? " (rescue)" : "")
	1053	}
	1054	MediaPipeline.shared.commitBuild(
	1055	reserved: est, delta: r.ok ? r.newBytes - r.oldBytes : 0)
	1056	if r.ok, r.newBytes > 0, slice == nil {
	1057	// Fold the measured size into the estimator (clamped so
	1058	// one weird chunk can't poison admissions).
	1059	let raw = self.rawChunkEstimate(media: media, width: width, index: index)
	1060	if raw > 0 {
	1061	let ratio = Double(r.newBytes) / raw
	1062	Self.chunkRateEMA = min(10, max(0.1,
	1063	Self.chunkRateEMA * 0.7 + ratio * 0.3))
	1064	}
	1065	}
434	1066	self.activeBuilds -= 1
435	1067	var s = self.states[media.cacheKey] ?? MediaState()
436	1068	s.inFlight.remove(index)
437		if r.ok {
	1069	if r.ok, let slice {
	1070	// Slice landed: cover the playhead NOW; the chunk still
	1071	// reads as unbuilt so the full encode queues right behind.
	1072	s.partial[index] = Rescue(offset: slice.offset, dur: r.dur,
	1073	width: width)
	1074	s.failed.remove(index)
	1075	s.version += 1
	1076	SeqLog.log("[cache] rescue %@#%d %.0fs@%.0fs w=%d in %.1fs",
	1077	String(media.cacheKey.prefix(8)), index, r.dur,
	1078	slice.offset, width, r.wall)
	1079	} else if r.ok {
438	1080	s.built[index] = width
439	1081	s.failed.remove(index)
440	1082	s.version += 1
441		} else if s.built[index] == nil {
	1083	// The full chunk supersedes any rescue slice under it.
	1084	if s.partial.removeValue(forKey: index) != nil {
	1085	let rURL = self.rescueURL(key: media.cacheKey, index: index)
	1086	DispatchQueue.global(qos: .utility).async {
	1087	let sz = (try? FileManager.default.attributesOfItem(
	1088	atPath: rURL.path)[.size] as? NSNumber)?.int64Value ?? 0
	1089	try? FileManager.default.removeItem(at: rURL)
	1090	if sz > 0 {
	1091	DispatchQueue.main.async {
	1092	MediaPipeline.shared.noteBytesAdded(-sz)
	1093	}
	1094	}
	1095	}
	1096	}
	1097	} else if s.built[index] == nil, slice == nil {
442	1098	// Only a hard failure when we have NOTHING; a failed
443	1099	// upgrade just keeps the existing lower-quality chunk.
	1100	// (A failed rescue is not a failure — the full build
	1101	// is still queued and gets its own attempt.)
444	1102	s.failed.insert(index)
445	1103	}
446	1104	self.states[media.cacheKey] = s
447		if r.ok {
	1105	if r.ok, slice == nil {
448	1106	self.persistWidths(key: media.cacheKey)
449	1107	// Only realtime (urgent) builds inform the realtime
450	1108	// controller — a slow, quality-first background build
...	...	@@ -462,9 +1120,19 @@ final class ChunkManager {
462	1120	}
463	1121	}
464	1122
465		struct BuildResult { var ok: Bool; var wall: Double; var dur: Double; var isNetwork: Bool }
	1123	struct BuildResult {
	1124	var ok: Bool; var wall: Double; var dur: Double; var isNetwork: Bool
	1125	/// Bytes of the finished chunk file / of the file it replaced (an
	1126	/// upgrade re-encode) — the ledger records the difference.
	1127	var newBytes: Int64 = 0; var oldBytes: Int64 = 0
	1128	}
	1129
	1130	/// Seconds of content a rescue slice encodes — enough to watch while the
	1131	/// full chunk builds behind it, small enough to land in a few seconds.
	1132	private static let rescueSeconds = 10.0
466	1133
467		private func buildChunk(media: MediaItem, index: Int, width: Int, fps: Int) -> BuildResult {
	1134	private func buildChunk(media: MediaItem, index: Int, width: Int, fps: Int,
	1135	slice: (offset: Double, dur: Double)? = nil) -> BuildResult {
468	1136	let isNet = Self.isNetworkPath(media.path)
469	1137	func fail(_ wall: Double = 0, _ dur: Double = 0) -> BuildResult {
470	1138	BuildResult(ok: false, wall: wall, dur: dur, isNetwork: isNet)
...	...	@@ -472,11 +1140,14 @@ final class ChunkManager {
472	1140	guard let ffmpeg = MediaPipeline.findExecutable("ffmpeg") else { return fail() }
473	1141	let dir = chunksDir(media.cacheKey)
474	1142	try? FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
475		let final = chunkURL(key: media.cacheKey, index: index)
476		let tmp = dir.appendingPathComponent(String(format: ".c%06d.partial.mov", index))
	1143	let final = slice == nil ? chunkURL(key: media.cacheKey, index: index)
	1144	: rescueURL(key: media.cacheKey, index: index)
	1145	let tmp = dir.appendingPathComponent(String(
	1146	format: slice == nil ? ".c%06d.partial.mov" : ".r%06d.partial.mov", index))
477	1147	try? FileManager.default.removeItem(at: tmp)
478		let start = Double(index) * Self.chunkSeconds
479		let dur = min(Self.chunkSeconds, media.duration - start)
	1148	let start = Double(index) * Self.chunkSeconds + (slice?.offset ?? 0)
	1149	var dur = min(Self.chunkSeconds - (slice?.offset ?? 0), media.duration - start)
	1150	if let slice { dur = min(dur, slice.dur) }
480	1151	guard dur > 0.01 else { return fail() }
481	1152
482	1153	func args(encoder: String) -> [String] {
...	...	@@ -485,7 +1156,12 @@ final class ChunkManager {
485	1156	"-i", media.path,
486	1157	"-t", String(format: "%.3f", dur),
487	1158	"-map", "0:v:0",
488		"-vf", "scale='min(\(width),iw)':-2,fps=\(fps)",
	1159	// Lanczos downscale: swscale's default (bicubic) softens the
	1160	// hard edges of up-scaled/pixel-art content into an annoying
	1161	// blur; lanczos keeps the downscaled proxy crisp (not
	1162	// nearest-neighbour "pixely", just sharp) — which matters more
	1163	// than resolution for editing legibility.
	1164	"-vf", "scale=w='min(\(width),iw)':h=-2:flags=lanczos,fps=\(fps)",
489	1165	"-c:v", encoder, "-profile:v", "proxy"]
490	1166	if media.hasAudio { a += ["-map", "0:a:0", "-c:a", "pcm_s16le"] }
491	1167	a.append(tmp.path)
...	...	@@ -498,10 +1174,16 @@ final class ChunkManager {
498	1174	}
499	1175	let wall = Date().timeIntervalSince(t0)
500	1176	if res.exitCode == 0 {
	1177	func size(_ url: URL) -> Int64 {
	1178	(try? FileManager.default.attributesOfItem(atPath: url.path)[.size]
	1179	as? NSNumber)?.int64Value ?? 0
	1180	}
	1181	let newBytes = size(tmp), oldBytes = size(final)
501	1182	try? FileManager.default.removeItem(at: final)
502	1183	do { try FileManager.default.moveItem(at: tmp, to: final) }
503	1184	catch { return fail(wall, dur) }
504		return BuildResult(ok: true, wall: wall, dur: dur, isNetwork: isNet)
	1185	return BuildResult(ok: true, wall: wall, dur: dur, isNetwork: isNet,
	1186	newBytes: newBytes, oldBytes: oldBytes)
505	1187	}
506	1188	try? FileManager.default.removeItem(at: tmp)
507	1189	return fail(wall, dur)
...	...	@@ -611,16 +1293,30 @@ final class ChunkManager {
611	1293	return (AVMutableComposition(), -2)
612	1294	}
613	1295
	1296	/// One stitched piece of a media's composition: a full chunk (offset 0,
	1297	/// dur nil) or a rescue slice sitting `offset` seconds into its grid slot.
	1298	private struct CompPart {
	1299	let url: URL
	1300	let offset: Double
	1301	let dur: Double?
	1302	}
	1303
614	1304	private func kickCompositionBuild(media: MediaItem) {
615	1305	let key = media.cacheKey
616	1306	guard !compBuilding.contains(key) else { return }
617	1307	compBuilding.insert(key)
618	1308	let s = state(for: media)
619	1309	let version = s.version
620		let chunkURLs = Dictionary(uniqueKeysWithValues:
621		s.built.keys.map { ($0, chunkURL(key: key, index: $0)) })
	1310	var parts: [Int: CompPart] = [:]
	1311	for i in s.built.keys {
	1312	parts[i] = CompPart(url: chunkURL(key: key, index: i), offset: 0, dur: nil)
	1313	}
	1314	for (i, p) in s.partial where parts[i] == nil {
	1315	parts[i] = CompPart(url: rescueURL(key: key, index: i),
	1316	offset: p.offset, dur: p.dur)
	1317	}
622	1318	Task.detached(priority: .userInitiated) {
623		let (comp, playable) = await Self.assemble(media: media, chunkURLs: chunkURLs)
	1319	let (comp, playable) = await Self.assemble(media: media, parts: parts)
624	1320	await MainActor.run { [self] in
625	1321	self.compBuilding.remove(key)
626	1322	var s = self.states[key] ?? MediaState()
...	...	@@ -634,8 +1330,24 @@ final class ChunkManager {
634	1330	}
635	1331	}
636	1332
	1333	/// A chunk asset's tracks, loaded and ready to insert. `asset` is what
	1334	/// keeps the tracks alive: an AVAssetTrack does NOT retain its asset, and
	1335	/// inserting a track whose asset has been deallocated fails with
	1336	/// -11800/-12780 — silently under `try?`, leaving a black GAP in the
	1337	/// composition for a chunk that's perfectly healthy on disk. (Bit us for
	1338	/// real: the task-group refactor returned bare tracks, and whether a slot
	1339	/// went black depended on autorelease timing.)
	1340	private struct LoadedPart {
	1341	let index: Int
	1342	let asset: AVURLAsset
	1343	let v: AVAssetTrack
	1344	let a: AVAssetTrack?
	1345	let duration: CMTime
	1346	let offset: Double
	1347	}
	1348
637	1349	private static func assemble(media: MediaItem,
638		chunkURLs: [Int: URL]) async -> (AVComposition, Bool) {
	1350	parts: [Int: CompPart]) async -> (AVComposition, Bool) {
639	1351	let comp = AVMutableComposition()
640	1352	guard let vTrack = comp.addMutableTrack(
641	1353	withMediaType: .video, preferredTrackID: kCMPersistentTrackID_Invalid)
...	...	@@ -647,6 +1359,51 @@ final class ChunkManager {
647	1359	let origV = try? await original.loadTracks(withMediaType: .video).first
648	1360	let origA = try? await original.loadTracks(withMediaType: .audio).first
649	1361
	1362	// Load every chunk asset's tracks CONCURRENTLY (bounded), then insert
	1363	// in order. The old one-await-per-chunk loop made a media with
	1364	// hundreds of built chunks take seconds to reassemble — and a
	1365	// reassembly runs every time a chunk lands, right when the user is
	1366	// waiting to see it.
	1367	let wantAudio = aTrack != nil
	1368	var loaded: [Int: LoadedPart] = [:]
	1369	await withTaskGroup(of: LoadedPart?.self) { group in
	1370	var pending = Array(parts).sorted { $0.key < $1.key }[...]
	1371	var inFlight = 0
	1372	func addNext() {
	1373	guard let (i, part) = pending.first else { return }
	1374	pending = pending.dropFirst()
	1375	inFlight += 1
	1376	group.addTask {
	1377	let chunk = AVURLAsset(url: part.url)
	1378	guard let v = try? await chunk.loadTracks(withMediaType: .video).first
	1379	else { return nil }
	1380	let d = (try? await chunk.load(.duration)) ?? .zero
	1381	let a = wantAudio
	1382	? try? await chunk.loadTracks(withMediaType: .audio).first : nil
	1383	return LoadedPart(index: i, asset: chunk, v: v, a: a, duration: d,
	1384	offset: part.offset)
	1385	}
	1386	}
	1387	for _ in 0..<8 { addNext() }
	1388	while inFlight > 0 {
	1389	guard let r = await group.next() else { break }
	1390	inFlight -= 1
	1391	if let r { loaded[r.index] = r }
	1392	addNext()
	1393	}
	1394	}
	1395
	1396	func fillFromOriginal(_ range: CMTimeRange) {
	1397	if let origV {
	1398	try? vTrack.insertTimeRange(range, of: origV, at: range.start)
	1399	if let aTrack, let origA {
	1400	try? aTrack.insertTimeRange(range, of: origA, at: range.start)
	1401	}
	1402	} else {
	1403	vTrack.insertEmptyTimeRange(range)
	1404	}
	1405	}
	1406
650	1407	let n = Self.chunkCount(duration: media.duration)
651	1408	for i in 0..<n {
652	1409	let startSec = Double(i) * Self.chunkSeconds
...	...	@@ -654,29 +1411,36 @@ final class ChunkManager {
654	1411	guard durSec > 0.001 else { break }
655	1412	let at = CMTime(seconds: startSec, preferredTimescale: 600)
656	1413	let dur = CMTime(seconds: durSec, preferredTimescale: 600)
657		var inserted = false
658		if let url = chunkURLs[i] {
659		let chunk = AVURLAsset(url: url)
660		if let v = try? await chunk.loadTracks(withMediaType: .video).first {
661		let chunkDuration = (try? await chunk.load(.duration)) ?? .zero
662		let r = CMTimeRange(start: .zero, duration: min(dur, chunkDuration))
663		try? vTrack.insertTimeRange(r, of: v, at: at)
664		if let aTrack, let a = try? await chunk.loadTracks(withMediaType: .audio).first {
665		try? aTrack.insertTimeRange(r, of: a, at: at)
666		}
667		inserted = true
668		}
	1414	guard let part = loaded[i] else {
	1415	fillFromOriginal(CMTimeRange(start: at, duration: dur))
	1416	continue
669	1417	}
670		if !inserted {
671		if let origV {
672		let r = CMTimeRange(start: at, duration: dur)
673		try? vTrack.insertTimeRange(r, of: origV, at: at)
674		if let aTrack, let origA {
675		try? aTrack.insertTimeRange(r, of: origA, at: at)
676		}
677		} else {
678		vTrack.insertEmptyTimeRange(CMTimeRange(start: at, duration: dur))
679		}
	1418	let sliceAt = CMTime(seconds: startSec + part.offset, preferredTimescale: 600)
	1419	let sliceDur = min(part.duration,
	1420	CMTime(seconds: durSec - part.offset, preferredTimescale: 600))
	1421	// Rescue slice: original (or empty) leads in, the slice covers the
	1422	// playhead's neighborhood, original (or empty) fills the tail.
	1423	if part.offset > 0.001 {
	1424	fillFromOriginal(CMTimeRange(start: at, end: sliceAt))
	1425	}
	1426	let r = CMTimeRange(start: .zero, duration: sliceDur)
	1427	do {
	1428	try vTrack.insertTimeRange(r, of: part.v, at: sliceAt)
	1429	} catch {
	1430	// A healthy chunk that fails to stitch plays back as a BLACK
	1431	// gap — never let that be silent again (a dropped asset
	1432	// reference made every insert fail exactly this way once).
	1433	SeqLog.log("[cache] comp insert FAILED %@#%d dur=%.2f: %@",
	1434	String(media.cacheKey.prefix(8)), i, sliceDur.seconds,
	1435	String(describing: error))
	1436	}
	1437	if let aTrack, let a = part.a {
	1438	try? aTrack.insertTimeRange(r, of: a, at: sliceAt)
	1439	}
	1440	let sliceEnd = sliceAt + sliceDur
	1441	let slotEnd = at + dur
	1442	if sliceEnd + CMTime(seconds: 0.001, preferredTimescale: 600) < slotEnd {
	1443	fillFromOriginal(CMTimeRange(start: sliceEnd, end: slotEnd))
680	1444	}
681	1445	}
682	1446	return (comp, origV != nil)

sequencer/Sources/Sequencer/Document.swift+31-1

...	...	@@ -12,7 +12,7 @@ import AppKit
12	12	/// and force the document type for any `.sq` URL — regardless of what
13	13	/// LaunchServices believes — so opening always resolves to `ProjectDocument`.
14	14	final class ProjectDocumentController: NSDocumentController {
15		private static let projectType = "com.clover.sequencer.project"
	15	private static let projectType = "net.paperclover.sequencer.project"
16	16	private let sqPanelDelegate = SQOpenPanelDelegate()
17	17
18	18	/// Pin the document type for `.sq` URLs so it never resolves to a folder,
...	...	@@ -41,6 +41,21 @@ final class ProjectDocumentController: NSDocumentController {
41	41	}
42	42	}
43	43	}
	44
	45	/// Opening a project from a pristine untitled window replaces that window
	46	/// instead of leaving an empty one behind.
	47	override func openDocument(withContentsOf url: URL, display displayDocument: Bool,
	48	completionHandler: @escaping (NSDocument?, Bool, Error?) -> Void) {
	49	let blanks = documents.compactMap { $0 as? ProjectDocument }.filter(\.isPristineUntitled)
	50	super.openDocument(withContentsOf: url, display: displayDocument) { doc, alreadyOpen, error in
	51	if doc != nil, error == nil {
	52	for blank in blanks where blank.isPristineUntitled && blank !== doc {
	53	blank.close()
	54	}
	55	}
	56	completionHandler(doc, alreadyOpen, error)
	57	}
	58	}
44	59	}
45	60
46	61	/// Enables only `.sq` items (package directories or legacy flat files) in the
...	...	@@ -73,6 +88,21 @@ final class ProjectDocument: NSDocument {
73	88	/// first explicit save.
74	89	override class var autosavesInPlace: Bool { true }
75	90
	91	/// Never saved, never edited, and nothing on the timeline — safe to close
	92	/// when a real project opens over it.
	93	var isPristineUntitled: Bool {
	94	fileURL == nil && !isDocumentEdited
	95	&& ctx.store.project.media.isEmpty && ctx.store.project.clips.isEmpty
	96	}
	97
	98	/// Stop per-document services before AppKit tears the document down, so a
	99	/// proxy build or the playback clock finishing after close can't touch the
	100	/// now-dangling `unowned` context.
	101	override func close() {
	102	ctx.shutdown()
	103	super.close()
	104	}
	105
76	106	override func makeWindowControllers() {
77	107	let wc = SequencerWindowController(ctx: ctx)
78	108	addWindowController(wc)

sequencer/Sources/Sequencer/DocumentContext.swift+40-3

...	...	@@ -47,6 +47,25 @@ final class DocumentContext {
47	47	}
48	48	}
49	49
	50	private var didShutdown = false
	51
	52	/// Tear the document's services down while `self` is still alive — called
	53	/// from `ProjectDocument.close()`. Services hold `unowned var ctx`; an
	54	/// in-flight chunk build or the 60 Hz clock landing a callback AFTER the
	55	/// context deallocs would trap on that dangling reference. Stopping them here
	56	/// (before dealloc) makes every such late callback a no-op.
	57	func shutdown() {
	58	guard !didShutdown else { return }
	59	didShutdown = true
	60	playback.stop()
	61	chunks.stop()
	62	comps.stopWatching()
	63	if let reconcileObserver {
	64	NotificationCenter.default.removeObserver(reconcileObserver)
	65	self.reconcileObserver = nil
	66	}
	67	}
	68
50	69	deinit {
51	70	if let reconcileObserver { NotificationCenter.default.removeObserver(reconcileObserver) }
52	71	comps.stopWatching()
...	...	@@ -55,8 +74,22 @@ final class DocumentContext {
55	74	/// Start the per-document services (playback clock, comps folder watch,
56	75	/// derived-asset warmup). Called once by the window controller after load.
57	76	func startServices() {
	77	// Trim the shared media cache under its byte cap now that this project's
	78	// media is registered (so its own cache is protected). Opening a
	79	// document is also the natural moment to re-measure the cache from
	80	// disk (reconcile) so the incremental ledger can't drift for long.
	81	MediaPipeline.shared.evictIfNeeded(reconcile: true)
58	82	MediaPipeline.shared.ensureDerivedAssets(for: store.project)
59		chunks.ensure(for: store.project)
	83	// NOTE: the whole-project proxy pre-build (`chunks.ensure`) is NOT kicked
	84	// here. macOS state restoration reopens every previously-open project on
	85	// launch, and each one running `ensure` would transcode its full ProRes
	86	// proxy set in parallel — every open project's media counts as "in use", so
	87	// eviction can't trim any of it and the shared cache blows past its cap and
	88	// fills the disk. Instead the fill is triggered when a document's window
	89	// becomes main (SequencerWindowController.windowDidBecomeMain): the
	90	// frontmost project fills immediately, a background/restored project fills
	91	// only once you switch to it. On-demand playhead builds (`want`) still run
	92	// for whatever is actually playing.
60	93	comps.rescan()
61	94	comps.startWatching()
62	95	playback.start()
...	...	@@ -69,10 +102,14 @@ final class DocumentContext {
69	102	/// (Settings, Export, cache eviction) that operate on whichever project is
70	103	/// frontmost. Falls back to the headless context when nothing is open.
71	104	static var current: DocumentContext {
72		if let wc = NSApp.keyWindow?.windowController as? SequencerWindowController {
	105	// `NSApp` is nil in the headless `--selftest` harness (no NSApplication);
	106	// guard it so callers on the build path can ask "am I frontmost?" without
	107	// crashing — with no app, the headless context is by definition current.
	108	guard let app = NSApp else { return headless }
	109	if let wc = app.keyWindow?.windowController as? SequencerWindowController {
73	110	return wc.ctx
74	111	}
75		if let wc = NSApp.mainWindow?.windowController as? SequencerWindowController {
	112	if let wc = app.mainWindow?.windowController as? SequencerWindowController {
76	113	return wc.ctx
77	114	}
78	115	if let doc = NSDocumentController.shared.currentDocument as? ProjectDocument {

sequencer/Sources/Sequencer/Export.swift+30-4

...	...	@@ -186,6 +186,7 @@ enum ExportError: Error, LocalizedError {
186	186	case fusion(String)
187	187	case intermediateFailed
188	188	case encodeFailed(String)
	189	case missingMedia([String])
189	190
190	191	var errorDescription: String? {
191	192	switch self {
...	...	@@ -194,6 +195,11 @@ enum ExportError: Error, LocalizedError {
194	195	case .fusion(let s): return s
195	196	case .intermediateFailed: return "Could not render the timeline composition."
196	197	case .encodeFailed(let s): return "ffmpeg failed to encode the output.\n\n\(s)"
	198	case .missingMedia(let names):
	199	let list = names.map { " • \($0)" }.joined(separator: "\n")
	200	return "Export was stopped because this media could not be read — the "
	201	+ "output would silently drop those clips. Reconnect the drive or "
	202	+ "relink the files and try again:\n\n\(list)"
197	203	}
198	204	}
199	205	}
...	...	@@ -244,24 +250,34 @@ enum Exporter {
244	250	let comp = AVMutableComposition()
245	251	let wantVideo = job.format.isVideo && !segments.isEmpty
246	252
	253	// Media that couldn't be read while building the composition. A silent
	254	// gap here means the render quietly drops content, so we collect every
	255	// offending source and abort (below) rather than hand ffmpeg a truncated
	256	// intermediate that looks like a successful export.
	257	var missing = Set<String>()
	258
247	259	// Video: one track, segments appended left-to-right with empty gaps.
248	260	if wantVideo, let vTrack = comp.addMutableTrack(
249	261	withMediaType: .video, preferredTrackID: kCMPersistentTrackID_Invalid) {
250	262	var cursor = 0.0
251	263	for seg in segments {
252		guard let media = project.media(seg.mediaId) else { continue }
	264	guard let media = project.media(seg.mediaId) else {
	265	missing.insert("(missing media reference)"); continue
	266	}
253	267	if seg.start > cursor + 1e-6 {
254	268	vTrack.insertEmptyTimeRange(cmRange(cursor, seg.start - cursor))
255	269	cursor = seg.start
256	270	}
257	271	let asset = AVURLAsset(url: media.url)
258	272	guard let src = loadTracksSync(asset, mediaType: .video).first else {
	273	missing.insert(media.displayName)
259	274	vTrack.insertEmptyTimeRange(cmRange(cursor, seg.duration)); cursor += seg.duration; continue
260	275	}
261	276	let srcDur = seg.duration * seg.speed
262	277	let range = cmRange(seg.srcIn, srcDur)
263	278	let at = cm(cursor)
264		try? vTrack.insertTimeRange(range, of: src, at: at)
	279	do { try vTrack.insertTimeRange(range, of: src, at: at) }
	280	catch { missing.insert(media.displayName) }
265	281	if abs(seg.speed - 1) > 1e-6 {
266	282	// Nothing has been appended after `at` yet, so scaling this
267	283	// range back to timeline duration is safe.
...	...	@@ -280,9 +296,12 @@ enum Exporter {
280	296	withMediaType: .audio, preferredTrackID: kCMPersistentTrackID_Invalid)
281	297	else { continue }
282	298	let asset = AVURLAsset(url: media.url)
283		guard let src = loadTracksSync(asset, mediaType: .audio).first else { continue }
	299	guard let src = loadTracksSync(asset, mediaType: .audio).first else {
	300	missing.insert(media.displayName); continue
	301	}
284	302	let srcDur = clip.duration * clip.speed
285		try? aTrack.insertTimeRange(cmRange(clip.srcIn, srcDur), of: src, at: cm(clip.start))
	303	do { try aTrack.insertTimeRange(cmRange(clip.srcIn, srcDur), of: src, at: cm(clip.start)) }
	304	catch { missing.insert(media.displayName) }
286	305	if abs(clip.speed - 1) > 1e-6 {
287	306	aTrack.scaleTimeRange(cmRange(clip.start, srcDur), toDuration: cm(clip.duration))
288	307	}
...	...	@@ -298,6 +317,13 @@ enum Exporter {
298	317	mixParams.append(p)
299	318	}
300	319
	320	// Any unreadable source means the render would be silently truncated —
	321	// stop and tell the user exactly which files, rather than produce a
	322	// partial export that looks complete.
	323	if !missing.isEmpty {
	324	throw ExportError.missingMedia(missing.sorted())
	325	}
	326
301	327	// Render the composition to an intermediate the encoder can read.
302	328	let tmp = tempDir()
303	329	defer { try? FileManager.default.removeItem(at: tmp) }

sequencer/Sources/Sequencer/FrameCache.swift created+106

...	...	@@ -0,0 +1,106 @@
	1	import Foundation
	2	import AVFoundation
	3	import QuartzCore
	4
	5	/// RAM cache of decoded, full-quality stand-in frames.
	6	///
	7	/// The players keep only ~1s of decoded video buffered, so the instant of a
	8	/// clip boundary (an item swap, or a long seek inside a stitched composition)
	9	/// has nothing exact to show for a beat — the viewer fell back to a 240px
	10	/// filmstrip thumb, or the "Loading Media…" spinner when even that missed.
	11	/// This cache holds the exact frames those moments need: cut heads and
	12	/// tails near the playhead are warmed before the boundary arrives, and any
	13	/// frame the viewer is currently unable to show gets decoded on demand from
	14	/// the sharpest thing on disk (chunk, rescue slice, or playable original).
	15	///
	16	/// Budget comes from the `maxRAMGB` default (Settings → Global, 2 GB when
	17	/// unset); a 1080p frame is ~8 MB, so even the default holds a couple of
	18	/// hundred boundaries. Frames are keyed on 0.25s buckets — a stand-in a
	19	/// fraction of a second off is indistinguishable during the sub-second hold
	20	/// it covers.
	21	final class FrameCache {
	22	static let shared = FrameCache()
	23	private static let bucket = 0.25
	24
	25	static var ramGB: Int {
	26	let gb = UserDefaults.standard.integer(forKey: "maxRAMGB")
	27	return gb > 0 ? gb : 2
	28	}
	29
	30	private let cache = NSCache<NSString, CGImage>()
	31	/// Decodes in flight / recently failed (source vanished mid-decode, or a
	32	/// truncated file) — failures back off so a hopeless frame isn't retried
	33	/// every tick. Main-thread only.
	34	private var inFlight = Set<String>()
	35	private var failedAt: [String: Double] = [:]
	36	private let genQueue = DispatchQueue(label: "sequencer.framecache",
	37	qos: .userInitiated)
	38
	39	init() { refreshBudget() }
	40
	41	/// Re-read the budget after the Settings field changes.
	42	func refreshBudget() {
	43	cache.totalCostLimit = Self.ramGB * 1_000_000_000
	44	}
	45
	46	private func key(_ mediaKey: String, bucket: Int) -> NSString {
	47	"\(mediaKey)@\(bucket)" as NSString
	48	}
	49	private func bucketIndex(_ src: Double) -> Int {
	50	Int((src / Self.bucket).rounded())
	51	}
	52
	53	/// The cached frame nearest `src`, if any (this bucket or a neighbor).
	54	func image(media: MediaItem, at src: Double) -> CGImage? {
	55	let b = bucketIndex(src)
	56	for d in [0, -1, 1] {
	57	if let img = cache.object(forKey: key(media.cacheKey, bucket: b + d)) {
	58	return img
	59	}
	60	}
	61	return nil
	62	}
	63
	64	/// Decode the frame at `src` into the cache if it isn't there already.
	65	/// `source` is a playable (file, time-in-file) pair for this moment,
	66	/// resolved on the main thread by `ChunkManager.frameSource` — nil (no
	67	/// chunk, no playable original) is a silent no-op. Posts
	68	/// `.viewerNeedsRefresh` when the frame lands so a waiting cell picks it
	69	/// up. Cheap and self-deduping; safe to call every tick.
	70	/// `SEQ_NOWARM=1` disables decodes (diagnostic kill switch).
	71	private static let disabled = ProcessInfo.processInfo.environment["SEQ_NOWARM"] != nil
	72
	73	func warm(mediaKey: String, at src: Double, source: (url: URL, time: Double)?) {
	74	guard !Self.disabled, let source else { return }
	75	let k = key(mediaKey, bucket: bucketIndex(src))
	76	let ks = k as String
	77	guard cache.object(forKey: k) == nil, !inFlight.contains(ks) else { return }
	78	let now = CACurrentMediaTime()
	79	if let failed = failedAt[ks], now - failed < 5 { return }
	80	inFlight.insert(ks)
	81	genQueue.async { [self] in
	82	let asset = AVURLAsset(url: source.url)
	83	let gen = AVAssetImageGenerator(asset: asset)
	84	gen.appliesPreferredTrackTransform = true
	85	// Exact going in, a hair of slack after: the frame ON the cut is
	86	// what a boundary needs, but a keyframe-snap decode is far cheaper
	87	// than a precise reverse walk.
	88	gen.requestedTimeToleranceBefore = .zero
	89	gen.requestedTimeToleranceAfter = CMTime(seconds: 0.2, preferredTimescale: 600)
	90	let t = CMTime(seconds: max(0, source.time), preferredTimescale: 60000)
	91	let img = try? gen.copyCGImage(at: t, actualTime: nil)
	92	DispatchQueue.main.async {
	93	self.inFlight.remove(ks)
	94	if let img {
	95	self.failedAt.removeValue(forKey: ks)
	96	self.cache.setObject(img, forKey: k,
	97	cost: img.bytesPerRow * img.height)
	98	NotificationCenter.default.post(name: .viewerNeedsRefresh,
	99	object: nil)
	100	} else {
	101	self.failedAt[ks] = CACurrentMediaTime()
	102	}
	103	}
	104	}
	105	}
	106	}

sequencer/Sources/Sequencer/HangMonitor.swift created+190

...	...	@@ -0,0 +1,190 @@
	1	import Foundation
	2	import Darwin
	3
	4	/// Main-thread hang watchdog. A background thread pings the main queue every
	5	/// 20ms; when the pong stops coming back for >100ms, the main thread is
	6	/// stalled — exactly the "microhang" that makes playback video stutter while
	7	/// audio (decoded off-main by CoreAudio) keeps going. While the stall lasts,
	8	/// the watchdog suspends the main thread for microseconds at a time, walks its
	9	/// frame pointers, and symbolicates — so the log names the culprit, not just
	10	/// the duration. Lines go to ~/Library/Logs/Sequencer.log via SeqLog:
	11	///
	12	/// [hang] main thread 0.34s during playback (rate 1.0) — 3 samples,
	13	/// top: ViewerGridView.update() ← CA::Transaction::commit ← …
	14	///
	15	/// Cost when healthy: one trivial main-queue block per 20ms. Disable with
	16	/// SEQ_NOHANGWATCH=1.
	17	/// SEQ_HANGTEST target: a recognizable frame that should appear in the
	18	/// sampled stack. Spins (not sleeps) so the pc sits in our own code.
	19	@inline(never)
	20	func hangTestStall() {
	21	let until = CFAbsoluteTimeGetCurrent() + 0.4
	22	var sink = 0.0
	23	while CFAbsoluteTimeGetCurrent() < until { sink += sin(sink) + 1 }
	24	_ = sink
	25	}
	26
	27	enum HangMonitor {
	28	/// Written from PlaybackController.setRate (main), read by the watchdog
	29	/// thread. Benign race — it only annotates log lines.
	30	nonisolated(unsafe) static var playbackRate: Double = 0
	31
	32	private nonisolated(unsafe) static var mainThread: thread_t = 0
	33	private nonisolated(unsafe) static var lastPong = CFAbsoluteTimeGetCurrent()
	34	private nonisolated(unsafe) static var pingInFlight = false
	35	private static let lock = NSLock()
	36	private static let threshold = 0.1 // report stalls longer than this
	37
	38	/// Call once from the main thread at startup.
	39	static func start() {
	40	guard ProcessInfo.processInfo.environment["SEQ_NOHANGWATCH"] == nil else { return }
	41	mainThread = pthread_mach_thread_np(pthread_self())
	42	let t = Thread { watch() }
	43	t.name = "sequencer.hangwatch"
	44	t.qualityOfService = .userInitiated
	45	t.start()
	46	}
	47
	48	private static func watch() {
	49	while true {
	50	usleep(20_000)
	51	lock.lock()
	52	let age = CFAbsoluteTimeGetCurrent() - lastPong
	53	let busy = pingInFlight
	54	if !busy {
	55	pingInFlight = true
	56	lock.unlock()
	57	DispatchQueue.main.async {
	58	lock.lock()
	59	lastPong = CFAbsoluteTimeGetCurrent()
	60	pingInFlight = false
	61	lock.unlock()
	62	}
	63	} else {
	64	lock.unlock()
	65	}
	66	if busy, age > threshold { observeStall(begunAge: age) }
	67	}
	68	}
	69
	70	/// Main thread has been unresponsive for `begunAge` already. Sample its
	71	/// stack periodically until it recovers, then log one line.
	72	private static func observeStall(begunAge: Double) {
	73	let start = CFAbsoluteTimeGetCurrent() - begunAge
	74	var samples: [[String]] = []
	75	while true {
	76	if samples.count < 5 {
	77	let frames = sampleMainStack()
	78	if !frames.isEmpty { samples.append(frames) }
	79	}
	80	usleep(100_000)
	81	lock.lock()
	82	let stillStalled = pingInFlight && lastPong < start
	83	lock.unlock()
	84	if !stillStalled { break }
	85	}
	86	// Wait for the pong to actually land so the duration is honest.
	87	var duration = CFAbsoluteTimeGetCurrent() - start
	88	for _ in 0..<200 { // give the queued pong up to 2s to run
	89	lock.lock(); let pong = lastPong; lock.unlock()
	90	if pong >= start { duration = pong - start; break }
	91	usleep(10_000)
	92	}
	93	guard duration > threshold else { return }
	94	let rate = playbackRate
	95	let during = rate != 0 ? String(format: " during playback (rate %.1f)", rate) : ""
	96	let top = samples.first?.prefix(8).joined(separator: " ← ") ?? "no stack (sampling failed)"
	97	SeqLog.log("[hang] main thread %.2fs%@ — %d sample%@, top: %@",
	98	duration, during, samples.count, samples.count == 1 ? "" : "s", top)
	99	for extra in samples.dropFirst() where extra.first != samples.first?.first {
	100	SeqLog.log("[hang] also seen: %@", extra.prefix(5).joined(separator: " ← "))
	101	}
	102	}
	103
	104	// MARK: stack sampling (arm64 frame-pointer walk)
	105
	106	/// Fixed buffers, touched only by the watchdog thread. They exist so the
	107	/// suspend window below performs ZERO allocations: if the main thread is
	108	/// suspended while holding the malloc lock, any malloc here deadlocks the
	109	/// whole app (watchdog waits on the lock, suspended main can never release
	110	/// it, thread_resume never runs). This happened — main frozen mid free()
	111	/// in drawRuler, watchdog frozen in Array.append → permanent freeze.
	112	private static let maxFrames = 50
	113	private nonisolated(unsafe) static var pcBuf = [UInt64](repeating: 0, count: maxFrames)
	114	private nonisolated(unsafe) static var pairBuf = [UInt64](repeating: 0, count: 2)
	115
	116	private static func sampleMainStack() -> [String] {
	117	guard mainThread != 0, thread_suspend(mainThread) == KERN_SUCCESS else { return [] }
	118	// ---- suspend window: no allocation, no locks, no ObjC/Swift runtime
	119	// calls that might take either. Only mach syscalls and raw stores. ----
	120	var n = 0
	121	var state = arm_thread_state64_t()
	122	var count = mach_msg_type_number_t(MemoryLayout<arm_thread_state64_t>.size
	123	/ MemoryLayout<natural_t>.size)
	124	let kr = withUnsafeMutablePointer(to: &state) { ptr in
	125	ptr.withMemoryRebound(to: natural_t.self, capacity: Int(count)) {
	126	thread_get_state(mainThread, ARM_THREAD_STATE64, $0, &count)
	127	}
	128	}
	129	if kr == KERN_SUCCESS {
	130	pcBuf[n] = arm64PC(state); n += 1
	131	let lr = arm64LR(state)
	132	var fp = arm64FP(state)
	133	if lr != 0 { pcBuf[n] = lr; n += 1 }
	134	// Frame layout: [fp] = caller fp, [fp+8] = return address.
	135	while n < maxFrames {
	136	guard fp != 0, fp & 0x7 == 0 else { break }
	137	var outSize: mach_vm_size_t = 16
	138	let r = pairBuf.withUnsafeMutableBytes { buf in
	139	mach_vm_read_overwrite(mach_task_self_, mach_vm_address_t(fp), 16,
	140	mach_vm_address_t(UInt(bitPattern: buf.baseAddress)),
	141	&outSize)
	142	}
	143	guard r == KERN_SUCCESS, pairBuf[1] != 0 else { break }
	144	pcBuf[n] = pairBuf[1]; n += 1
	145	guard pairBuf[0] > fp else { break } // stacks grow down; fp chain grows up
	146	fp = pairBuf[0]
	147	}
	148	}
	149	thread_resume(mainThread)
	150	// ---- end suspend window; symbolication may allocate freely. ----
	151	return (0..<n).compactMap { symbolicate(pcBuf[$0]) }
	152	}
	153
	154	private static func arm64PC(_ s: arm_thread_state64_t) -> UInt64 { s.__pc }
	155	private static func arm64LR(_ s: arm_thread_state64_t) -> UInt64 {
	156	s.__lr & 0x0000_7FFF_FFFF_FFFF // strip ptrauth bits
	157	}
	158	private static func arm64FP(_ s: arm_thread_state64_t) -> UInt64 { s.__fp }
	159
	160	private typealias DemangleFn = @convention(c) (
	161	UnsafePointer<CChar>?, Int, UnsafeMutablePointer<CChar>?,
	162	UnsafeMutablePointer<Int>?, UInt32) -> UnsafeMutablePointer<CChar>?
	163	private static let demangleFn: DemangleFn? = {
	164	guard let sym = dlsym(dlopen(nil, RTLD_NOW), "swift_demangle") else { return nil }
	165	return unsafeBitCast(sym, to: DemangleFn.self)
	166	}()
	167
	168	private static func symbolicate(_ pc: UInt64) -> String? {
	169	let stripped = pc & 0x0000_7FFF_FFFF_FFFF
	170	var info = Dl_info()
	171	guard dladdr(UnsafeRawPointer(bitPattern: UInt(stripped)), &info) != 0 else { return nil }
	172	var name: String
	173	if let sname = info.dli_sname {
	174	name = String(cString: sname)
	175	if name.hasPrefix("$s") \|\| name.hasPrefix("_$s"), let fn = demangleFn,
	176	let d = fn(name, name.utf8.count, nil, nil, 0) {
	177	name = String(cString: d)
	178	free(d)
	179	// Demangled Swift names are long; keep the signature-free head.
	180	if let paren = name.firstIndex(of: "(") { name = String(name[..<paren]) + "()" }
	181	}
	182	} else if let fname = info.dli_fname {
	183	name = (String(cString: fname) as NSString).lastPathComponent
	184	+ String(format: "+0x%llx", stripped - UInt64(UInt(bitPattern: info.dli_fbase)))
	185	} else {
	186	return nil
	187	}
	188	return name
	189	}
	190	}

sequencer/Sources/Sequencer/LayerTest.swift created+77

...	...	@@ -0,0 +1,77 @@
	1	import AppKit
	2	import AVFoundation
	3
	4	/// Diagnostic (temporary): `sequencer --layertest <key:orig> [<key:orig> …]`.
	5	/// Builds the same chunk+original stitched compositions the app plays and
	6	/// shows each in a bare AVPlayerLayer tile — isolating "do N of these render
	7	/// concurrently" from every other moving part of the app. Seeks all tiles to
	8	/// SEQ_LAYERTEST_T (default 16.6).
	9	@MainActor
	10	func runLayerTest(specs: [String]) {
	11	let t = Double(ProcessInfo.processInfo.environment["SEQ_LAYERTEST_T"] ?? "") ?? 16.6
	12	let cols = specs.count
	13	let tileW = 420.0, tileH = 260.0
	14	let win = NSWindow(contentRect: NSRect(x: 100, y: 300,
	15	width: tileW * Double(cols), height: tileH),
	16	styleMask: [.titled], backing: .buffered, defer: false)
	17	win.title = "LayerTest t=\(t)"
	18	win.contentView!.wantsLayer = true
	19	win.makeKeyAndOrderFront(nil)
	20	NSApp.activate(ignoringOtherApps: true)
	21
	22	for (col, spec) in specs.enumerated() {
	23	let bits = spec.split(separator: ":", maxSplits: 1).map(String.init)
	24	guard bits.count == 2 else { continue }
	25	let key = bits[0], orig = bits[1]
	26	let player = AVPlayer()
	27	player.automaticallyWaitsToMinimizeStalling = false
	28	let layer = AVPlayerLayer(player: player)
	29	layer.frame = NSRect(x: Double(col) * tileW, y: 0, width: tileW, height: tileH)
	30	layer.videoGravity = .resizeAspect
	31	layer.backgroundColor = NSColor.purple.cgColor // un-rendered = purple
	32	win.contentView!.layer!.addSublayer(layer)
	33	let chunkDir = MediaPipeline.shared.cacheRoot
	34	.appendingPathComponent(key).appendingPathComponent("chunks")
	35	Task { @MainActor in
	36	let comp = AVMutableComposition()
	37	let vTrack = comp.addMutableTrack(withMediaType: .video,
	38	preferredTrackID: kCMPersistentTrackID_Invalid)!
	39	let original = AVURLAsset(url: URL(fileURLWithPath: orig))
	40	let origV = try? await original.loadTracks(withMediaType: .video).first
	41	let origDur = (try? await original.load(.duration))?.seconds ?? 0
	42	for i in 0..<Int(ceil(origDur / 30)) {
	43	let startSec = Double(i) * 30
	44	let at = CMTime(seconds: startSec, preferredTimescale: 600)
	45	let dur = CMTime(seconds: min(30, origDur - startSec),
	46	preferredTimescale: 600)
	47	let url = chunkDir.appendingPathComponent(String(format: "c%06d.mov", i))
	48	if FileManager.default.fileExists(atPath: url.path) {
	49	let chunk = AVURLAsset(url: url)
	50	if let v = try? await chunk.loadTracks(withMediaType: .video).first {
	51	let d = (try? await chunk.load(.duration)) ?? .zero
	52	try? vTrack.insertTimeRange(
	53	CMTimeRange(start: .zero, duration: min(d, dur)), of: v, at: at)
	54	continue
	55	}
	56	}
	57	if let origV {
	58	try? vTrack.insertTimeRange(CMTimeRange(start: at, duration: dur),
	59	of: origV, at: at)
	60	}
	61	}
	62	let item = AVPlayerItem(asset: comp)
	63	item.preferredForwardBufferDuration = 1
	64	player.replaceCurrentItem(with: item)
	65	while item.status != .readyToPlay {
	66	try? await Task.sleep(nanoseconds: 100_000_000)
	67	}
	68	let t0 = CACurrentMediaTime()
	69	nonisolated(unsafe) let layerRef = layer // diagnostic: read on main at completion
	70	player.seek(to: CMTime(seconds: t, preferredTimescale: 60000),
	71	toleranceBefore: .zero, toleranceAfter: .zero) { _ in
	72	NSLog("[layertest] %@ seek landed in %.1fs ready=%d", key,
	73	CACurrentMediaTime() - t0, layerRef.isReadyForDisplay ? 1 : 0)
	74	}
	75	}
	76	}
	77	}

sequencer/Sources/Sequencer/Log.swift created+44

...	...	@@ -0,0 +1,44 @@
	1	import Foundation
	2
	3	/// Diagnostics that must survive without a console attached. NSLog only
	4	/// reaches the unified log (invisible for `open`-launched apps unless you go
	5	/// digging in Console.app), so the lines worth keeping — every [miss] spinner
	6	/// event, rescue/build failures, admission blocks — are ALSO appended to
	7	/// `~/Library/Logs/Sequencer.log`. Plain text, timestamped, rotated at 5 MB
	8	/// (one `.old` generation kept).
	9	enum SeqLog {
	10	private static let queue = DispatchQueue(label: "sequencer.log", qos: .utility)
	11	private static let url: URL = {
	12	let dir = FileManager.default.urls(for: .libraryDirectory, in: .userDomainMask)[0]
	13	.appendingPathComponent("Logs", isDirectory: true)
	14	try? FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
	15	return dir.appendingPathComponent("Sequencer.log")
	16	}()
	17	private static let stamp: DateFormatter = {
	18	let f = DateFormatter()
	19	f.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
	20	return f
	21	}()
	22
	23	/// Log to the unified log (NSLog) AND the plain-text file.
	24	static func log(_ format: String, _ args: CVarArg...) {
	25	let line = String(format: format, arguments: args)
	26	NSLog("%@", line)
	27	let dated = "\(stamp.string(from: Date())) \(line)\n"
	28	queue.async {
	29	if let size = (try? FileManager.default.attributesOfItem(atPath: url.path)[.size]
	30	as? NSNumber)?.int64Value, size > 5_000_000 {
	31	let old = url.deletingPathExtension().appendingPathExtension("old.log")
	32	try? FileManager.default.removeItem(at: old)
	33	try? FileManager.default.moveItem(at: url, to: old)
	34	}
	35	if let h = FileHandle(forWritingAtPath: url.path) {
	36	defer { try? h.close() }
	37	_ = try? h.seekToEnd()
	38	try? h.write(contentsOf: Data(dated.utf8))
	39	} else {
	40	try? Data(dated.utf8).write(to: url)
	41	}
	42	}
	43	}
	44	}

sequencer/Sources/Sequencer/MediaPipeline.swift+350-55

...	...	@@ -17,8 +17,8 @@ final class MediaPipeline {
17	17	static let shared = MediaPipeline()
18	18
19	19	let cacheRoot: URL
20		/// LRU cap in bytes (default 50 GB). Override with `defaults write
21		/// com.sequencer maxCacheGB -int 100`.
	20	/// LRU cap in bytes (default 50 GB). Override in Settings, or `defaults
	21	/// write net.paperclover.Sequencer maxCacheGB -int 100`.
22	22	var maxCacheBytes: Int64 {
23	23	let gb = UserDefaults.standard.integer(forKey: "maxCacheGB")
24	24	return Int64(gb > 0 ? gb : 50) * 1_000_000_000
...	...	@@ -28,7 +28,7 @@ final class MediaPipeline {
28	28	private let ffprobe: String?
29	29	private let workQueue = OperationQueue()
30	30	private var statuses: [UUID: MediaStatus] = [:] // main-thread only
31		private let thumbCache = NSCache<NSString, NSImage>()
	31	private let thumbCache = NSCache<NSString, CGImage>()
32	32	private var stripInfoCache: [String: (interval: Double, count: Int)] = [:]
33	33	private var lruTouched: [String: Date] = [:]
34	34
...	...	@@ -44,6 +44,12 @@ final class MediaPipeline {
44	44	ffprobe = Self.findExecutable("ffprobe")
45	45	workQueue.maxConcurrentOperationCount = 2
46	46	thumbCache.countLimit = 2000
	47	// A previous instance killed mid-build (rebuild relaunch, force quit)
	48	// leaves orphaned ffmpeg encoders holding shared VideoToolbox decode
	49	// sessions — enough of them and every AVPlayer here renders black.
	50	Self.reapOrphans(cacheRoot: cacheRoot)
	51	// Measure the cache once at launch; chunk builds wait on `budgetReady`.
	52	DispatchQueue.main.async { self.reconcileLedger() }
47	53	}
48	54
49	55	static func findExecutable(_ name: String) -> String? {
...	...	@@ -68,6 +74,18 @@ final class MediaPipeline {
68	74	return s
69	75	}
70	76
	77	private var offlineCache: [String: (offline: Bool, until: Date)] = [:] // main-thread only
	78	/// Whether the media's ORIGINAL file is currently unreachable (moved, or on
	79	/// an unmounted NAS). Cached briefly so the viewer can call it every frame
	80	/// without a `stat` each time, and so it auto-recovers when the drive returns.
	81	func isOffline(_ media: MediaItem) -> Bool {
	82	let now = Date()
	83	if let c = offlineCache[media.cacheKey], c.until > now { return c.offline }
	84	let off = !FileManager.default.fileExists(atPath: media.path)
	85	offlineCache[media.cacheKey] = (off, now.addingTimeInterval(2))
	86	return off
	87	}
	88
71	89	// MARK: - Cache paths
72	90
73	91	/// The shape `cacheKey(for:)` produces: exactly 16 lowercase hex chars. A
...	...	@@ -236,25 +254,71 @@ final class MediaPipeline {
236	254	"aformat=channel_layouts=mono,showwavespic=s=2048x200:colors=white",
237	255	"-frames:v", "1", waveformURL(media.cacheKey).path,
238	256	])
	257	let bytes = (try? FileManager.default.attributesOfItem(
	258	atPath: waveformURL(media.cacheKey).path)[.size] as? NSNumber)?.int64Value ?? 0
239	259	DispatchQueue.main.async {
240	260	self.touchLRU(media.cacheKey)
241	261	if res.exitCode == 0 {
242		NotificationCenter.default.post(name: .mediaStatusChanged, object: nil)
	262	self.noteBytesAdded(bytes)
	263	self.imgStateLock.lock()
	264	self.waveformMissing.remove(media.cacheKey)
	265	self.imgStateLock.unlock()
	266	// `scene: true` — a waveform image changes timeline pixels
	267	// (the tile cache flushes on it; plain chunk churn must not).
	268	NotificationCenter.default.post(name: .mediaStatusChanged, object: nil,
	269	userInfo: ["scene": true])
243	270	}
244	271	}
245	272	}
246	273
247		private let waveformCache = NSCache<NSString, NSImage>()
	274	private let waveformCache = NSCache<NSString, CGImage>()
	275
	276	/// Decode an image file straight into the display's raster format (BGRA
	277	/// premultiplied, screen colorspace). A plain NSImage/CGImageSource image
	278	/// keeps the file's own format (RGB JPEG, generic colorspace), and Quartz
	279	/// then converts it on EVERY draw — per thumbnail, per frame. Converting
	280	/// once at load makes the timeline's image blits plain memory copies.
	281	static func displayImage(contentsOf url: URL) -> CGImage? {
	282	guard let src = CGImageSourceCreateWithURL(url as CFURL, nil),
	283	let raw = CGImageSourceCreateImageAtIndex(
	284	src, 0, [kCGImageSourceShouldCache: false] as CFDictionary)
	285	else { return nil }
	286	let space = NSScreen.main?.colorSpace?.cgColorSpace
	287	?? CGColorSpace(name: CGColorSpace.sRGB)!
	288	guard let ctx = CGContext(
	289	data: nil, width: raw.width, height: raw.height,
	290	bitsPerComponent: 8, bytesPerRow: 0, space: space,
	291	bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue
	292	\| CGBitmapInfo.byteOrder32Little.rawValue) else { return raw }
	293	ctx.draw(raw, in: CGRect(x: 0, y: 0, width: raw.width, height: raw.height))
	294	return ctx.makeImage() ?? raw
	295	}
248	296
249		func waveformImage(for media: MediaItem) -> NSImage? {
250		let key = media.cacheKey as NSString
251		if let img = waveformCache.object(forKey: key) { return img }
252		let url = waveformURL(media.cacheKey)
	297	/// Same negative/in-flight bookkeeping as thumbnails: a missing waveform
	298	/// must not re-dispatch a load per audio clip per frame.
	299	private var waveformMissing = Set<String>()
	300	private var waveformLoading = Set<String>()
	301
	302	func waveformImage(for media: MediaItem) -> CGImage? {
	303	let key = media.cacheKey
	304	if let img = waveformCache.object(forKey: key as NSString) { return img }
	305	imgStateLock.lock()
	306	let skip = waveformMissing.contains(key) \|\| waveformLoading.contains(key)
	307	if !skip { waveformLoading.insert(key) }
	308	imgStateLock.unlock()
	309	guard !skip else { return nil }
	310	let url = waveformURL(key)
253	311	DispatchQueue.global(qos: .utility).async {
254		guard let img = NSImage(contentsOf: url) else { return }
	312	let img = Self.displayImage(contentsOf: url)
255	313	DispatchQueue.main.async {
256		self.waveformCache.setObject(img, forKey: key)
257		self.notifyThumbsCoalesced()
	314	self.imgStateLock.lock()
	315	self.waveformLoading.remove(key)
	316	if img == nil { self.waveformMissing.insert(key) }
	317	self.imgStateLock.unlock()
	318	if let img {
	319	self.waveformCache.setObject(img, forKey: key as NSString)
	320	self.notifyThumbsCoalesced()
	321	}
258	322	}
259	323	}
260	324	return nil
...	...	@@ -279,41 +343,72 @@ final class MediaPipeline {
279	343	try? d.write(to: stripInfoURL(media.cacheKey))
280	344	}
281	345	}
	346	let bytes = Self.directorySize(dir)
282	347	DispatchQueue.main.async {
283	348	var s = self.status(for: media)
284	349	s.filmstripReady = res.exitCode == 0 && count > 0
285	350	self.statuses[media.id] = s
286	351	self.touchLRU(media.cacheKey)
287		NotificationCenter.default.post(name: .mediaStatusChanged, object: nil)
	352	self.noteBytesAdded(bytes)
	353	self.imgStateLock.lock()
	354	self.thumbMissing.removeAll() // a fresh strip supersedes misses
	355	self.imgStateLock.unlock()
	356	NotificationCenter.default.post(name: .mediaStatusChanged, object: nil,
	357	userInfo: ["scene": true])
288	358	}
289	359	}
290	360
291	361	// MARK: - Filmstrip access
292	362
293	363	func filmstripInfo(_ key: String) -> (interval: Double, count: Int)? {
294		if let c = stripInfoCache[key] { return c }
	364	imgStateLock.lock()
	365	let cached = stripInfoCache[key]
	366	imgStateLock.unlock()
	367	if let cached { return cached }
295	368	guard let data = try? Data(contentsOf: stripInfoURL(key)),
296	369	let json = try? JSONSerialization.jsonObject(with: data) as? [String: Any],
297	370	let interval = json["interval"] as? Double,
298	371	let count = json["count"] as? Int else { return nil }
	372	imgStateLock.lock()
299	373	stripInfoCache[key] = (interval, count)
	374	imgStateLock.unlock()
300	375	return (interval, count)
301	376	}
302	377
303	378	/// Cached thumbnail nearest to `seconds`; loads async and posts a single
304	379	/// coalesced .mediaStatusChanged when thumbs land (a post per thumb
305	380	/// cascades into an app-wide refresh storm while a filmstrip streams in).
306		func filmstripImage(for media: MediaItem, at seconds: Double) -> NSImage? {
	381	/// Thumbs that failed to load (file absent/evicted) or are mid-load.
	382	/// Without these a dense timeline re-dispatches a load per missing thumb
	383	/// per FRAME — hundreds of no-op queue hops every draw. Misses are
	384	/// forgotten whenever fresh thumbs land (strips may have regenerated).
	385	/// Lock-guarded: the timeline rasterizes lanes on parallel threads.
	386	private var thumbMissing = Set<String>()
	387	private var thumbLoading = Set<String>()
	388	private let imgStateLock = NSLock()
	389
	390	func filmstripImage(for media: MediaItem, at seconds: Double) -> CGImage? {
307	391	guard let info = filmstripInfo(media.cacheKey) else { return nil }
308	392	let index = min(info.count, max(1, Int(seconds / info.interval) + 1))
309		let cacheId = "\(media.cacheKey)/\(index)" as NSString
310		if let img = thumbCache.object(forKey: cacheId) { return img }
	393	let cacheId = "\(media.cacheKey)/\(index)"
	394	if let img = thumbCache.object(forKey: cacheId as NSString) { return img }
	395	imgStateLock.lock()
	396	let skip = thumbMissing.contains(cacheId) \|\| thumbLoading.contains(cacheId)
	397	if !skip { thumbLoading.insert(cacheId) }
	398	imgStateLock.unlock()
	399	guard !skip else { return nil }
311	400	let url = stripDir(media.cacheKey).appendingPathComponent(String(format: "%06d.jpg", index))
312	401	DispatchQueue.global(qos: .utility).async {
313		guard let img = NSImage(contentsOf: url) else { return }
	402	let img = Self.displayImage(contentsOf: url)
314	403	DispatchQueue.main.async {
315		self.thumbCache.setObject(img, forKey: cacheId)
316		self.notifyThumbsCoalesced()
	404	self.imgStateLock.lock()
	405	self.thumbLoading.remove(cacheId)
	406	if img == nil { self.thumbMissing.insert(cacheId) }
	407	self.imgStateLock.unlock()
	408	if let img {
	409	self.thumbCache.setObject(img, forKey: cacheId as NSString)
	410	self.notifyThumbsCoalesced()
	411	}
317	412	}
318	413	}
319	414	return nil
...	...	@@ -325,7 +420,11 @@ final class MediaPipeline {
325	420	thumbNotifyPending = true
326	421	DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
327	422	self.thumbNotifyPending = false
328		NotificationCenter.default.post(name: .mediaStatusChanged, object: nil)
	423	self.imgStateLock.lock()
	424	self.thumbMissing.removeAll() // strips may have (re)generated
	425	self.imgStateLock.unlock()
	426	NotificationCenter.default.post(name: .mediaStatusChanged, object: nil,
	427	userInfo: ["scene": true])
329	428	}
330	429	}
331	430
...	...	@@ -341,52 +440,202 @@ final class MediaPipeline {
341	440
342	441	private var evicting = false
343	442
344		/// LRU eviction under the byte cap. Size scan and deletion run off-main
345		/// (the cache walk is I/O); never touches the current project's media.
346		func evictIfNeeded() {
347		guard !evicting else { return }
	443	// MARK: - Cache budget ledger
	444
	445	/// Approximate cache size in bytes, maintained incrementally (builds add,
	446	/// evictions subtract) and reconciled against a real walk at launch and on
	447	/// document open. With the ledger, staying under the cap is enforced BEFORE
	448	/// bytes hit the disk (`tryReserve`), and the per-build full-cache walk the
	449	/// old eviction did is gone. Main-thread only.
	450	private(set) var ledgerBytes: Int64 = 0
	451	/// Bytes promised to in-flight chunk builds; released on completion.
	452	private var reservedBytes: Int64 = 0
	453	/// False until the first reconcile walk finishes. Admission stays closed
	454	/// while false, so an unmeasured cache can never be built past the cap.
	455	private(set) var budgetReady = false
	456	private var reconciling = false
	457
	458	/// When eviction runs at all it frees down to here (not just under the
	459	/// cap), so it works in batches instead of one chunk per build.
	460	var lowWatermarkBytes: Int64 { Int64(Double(maxCacheBytes) * 0.92) }
	461
	462	/// Re-measure the cache and set the ledger to ground truth. Called at
	463	/// launch, on document open, and when the cap changes; incremental updates
	464	/// keep it honest in between.
	465	/// Anything on disk with an mtime before this was left by a previous
	466	/// session — the test for purging session-transient files (rescue slices,
	467	/// crashed builds' .partial temps) without touching live ones.
	468	private static let processStart = Date()
	469
	470	func reconcileLedger() {
	471	guard !reconciling else { return }
	472	reconciling = true
	473	let root = cacheRoot
	474	DispatchQueue.global(qos: .utility).async {
	475	Self.purgeSessionTransients(root: root)
	476	let total = Self.directorySize(root)
	477	DispatchQueue.main.async {
	478	NSLog("[cache] reconcile: %.2f GB on disk (cap %.0f GB)",
	479	Double(total) / 1e9, Double(self.maxCacheBytes) / 1e9)
	480	self.ledgerBytes = total
	481	self.budgetReady = true
	482	self.reconciling = false
	483	if self.ledgerBytes + self.reservedBytes > self.maxCacheBytes {
	484	self.evictToFit(need: 0) { _ in }
	485	}
	486	for c in DocumentContext.allLive { c.chunks.budgetChanged() }
	487	}
	488	}
	489	}
	490
	491	/// Reserve room for a build about to start. The reservation counts against
	492	/// the ceiling alongside bytes already on disk, so two concurrent builds
	493	/// can't both squeeze into the same headroom. Window builds reserve up to
	494	/// the cap; background fill only up to the low watermark — the band in
	495	/// between is slack for playhead work, so fill can never trigger (or
	496	/// refight) an eviction. Main thread.
	497	func tryReserve(bytes: Int64, upTo ceiling: Int64) -> Bool {
	498	guard budgetReady, ledgerBytes + reservedBytes + bytes <= ceiling else { return false }
	499	reservedBytes += bytes
	500	return true
	501	}
	502
	503	/// A reserved build finished: release its reservation and record what
	504	/// actually landed on disk (new file minus any replaced one; 0 on failure).
	505	func commitBuild(reserved: Int64, delta: Int64) {
	506	reservedBytes = max(0, reservedBytes - reserved)
	507	ledgerBytes = max(0, ledgerBytes + delta)
	508	}
	509
	510	/// Bytes written outside the reservation flow (filmstrips, waveforms —
	511	/// small, but the ledger should still see them between reconciles).
	512	func noteBytesAdded(_ bytes: Int64) { ledgerBytes += bytes }
	513
	514	/// Cheap budget check for the old trigger sites (build completions, doc
	515	/// open, manual). `reconcile: true` re-walks the disk first — use it when
	516	/// ground truth matters (doc open, cap change, menu action).
	517	func evictIfNeeded(reconcile: Bool = false) {
	518	if reconcile \|\| !budgetReady { reconcileLedger(); return }
	519	if ledgerBytes + reservedBytes > maxCacheBytes {
	520	evictToFit(need: 0) { _ in }
	521	}
	522	}
	523
	524	/// Free cache space so `need` more bytes fit under `ceiling` (the cap for
	525	/// playhead work, the low watermark for fill), evicting down to the low
	526	/// watermark once it runs at all. Coldness order: whole cache dirs of
	527	/// projects no window has open (LRU) first, then — when `openDocChunks` —
	528	/// individual cold proxy chunks of open documents, never touching any
	529	/// document's working set (see ChunkManager.evictionCandidates).
	530	/// `completion(true)` on main once the space exists.
	531	func evictToFit(need: Int64, openDocChunks: Bool = true,
	532	upTo ceiling: Int64? = nil,
	533	completion: @escaping (Bool) -> Void) {
	534	let ceiling = ceiling ?? maxCacheBytes
	535	guard budgetReady, !evicting else { completion(false); return }
	536	let deficit = (ledgerBytes + reservedBytes + need) - lowWatermarkBytes
	537	guard deficit > 0 else { completion(true); return }
348	538	evicting = true
349		// Protect the media of every open document (not just the front one) so
350		// eviction can't drop cache another window is still using.
	539	// Whole-dir eviction must not touch any open document's media — those
	540	// dirs also hold filmstrips/waveforms other windows are showing. Their
	541	// cold CHUNKS are reclaimed individually via the candidates instead.
351	542	let inUse = Set(DocumentContext.allLive.flatMap { $0.store.project.media.map(\.cacheKey) })
	543	var chunkCands: [ChunkManager.EvictionCandidate] = []
	544	if openDocChunks {
	545	for c in DocumentContext.allLive { chunkCands += c.chunks.evictionCandidates() }
	546	chunkCands.sort { $0.coldness > $1.coldness }
	547	}
352	548	let root = cacheRoot
353		let cap = maxCacheBytes
354	549	DispatchQueue.global(qos: .utility).async {
355	550	let fm = FileManager.default
356		var evicted: [String] = []
357		defer {
358		DispatchQueue.main.async {
359		for k in evicted {
360		self.stripInfoCache[k] = nil
361		self.enqueued.remove(k)
362		}
363		for c in DocumentContext.allLive { c.chunks.forget(keys: evicted) }
364		self.evicting = false
	551	var freed: Int64 = 0
	552	var evictedDirs: [String] = []
	553	var evictedChunks: [String: [Int]] = [:]
	554	// 1. Closed projects' whole cache dirs, least recently used first.
	555	if let keys = try? fm.contentsOfDirectory(atPath: root.path) {
	556	var entries: [(key: String, lastUsed: Double)] = []
	557	for key in keys where !inUse.contains(key) {
	558	let dir = root.appendingPathComponent(key, isDirectory: true)
	559	var isDir: ObjCBool = false
	560	guard fm.fileExists(atPath: dir.path, isDirectory: &isDir), isDir.boolValue else { continue }
	561	let lastUsed = Double((try? String(contentsOf: dir.appendingPathComponent("lastUsed"), encoding: .utf8)) ?? "") ?? 0
	562	entries.append((key, lastUsed))
	563	}
	564	for e in entries.sorted(by: { $0.lastUsed < $1.lastUsed }) {
	565	guard freed < deficit else { break }
	566	let dir = root.appendingPathComponent(e.key, isDirectory: true)
	567	let bytes = Self.directorySize(dir)
	568	try? fm.removeItem(at: dir)
	569	evictedDirs.append(e.key)
	570	freed += bytes
365	571	}
366	572	}
367		guard let keys = try? fm.contentsOfDirectory(atPath: root.path) else { return }
368		var entries: [(key: String, bytes: Int64, lastUsed: Double)] = []
369		var total: Int64 = 0
370		for key in keys {
371		let dir = root.appendingPathComponent(key, isDirectory: true)
372		var isDir: ObjCBool = false
373		guard fm.fileExists(atPath: dir.path, isDirectory: &isDir), isDir.boolValue else { continue }
374		let bytes = Self.directorySize(dir)
375		let lastUsed = Double((try? String(contentsOf: dir.appendingPathComponent("lastUsed"), encoding: .utf8)) ?? "") ?? 0
376		total += bytes
377		entries.append((key, bytes, lastUsed))
	573	// 2. Cold chunks of open documents, coldest (farthest from any
	574	// playhead / off-timeline) first.
	575	for c in chunkCands {
	576	guard freed < deficit else { break }
	577	let bytes = (try? fm.attributesOfItem(atPath: c.url.path)[.size] as? NSNumber)?.int64Value ?? 0
	578	guard bytes > 0 else { continue }
	579	try? fm.removeItem(at: c.url)
	580	evictedChunks[c.key, default: []].append(c.index)
	581	freed += bytes
378	582	}
379		guard total > cap else { return }
380		for e in entries.sorted(by: { $0.lastUsed < $1.lastUsed }) where !inUse.contains(e.key) {
381		try? fm.removeItem(at: root.appendingPathComponent(e.key, isDirectory: true))
382		evicted.append(e.key)
383		total -= e.bytes
384		if total <= cap { break }
	583	DispatchQueue.main.async {
	584	self.ledgerBytes = max(0, self.ledgerBytes - freed)
	585	NSLog("[cache] evict: freed %.2f GB (%d dirs, %d chunks) → ledger %.2f GB",
	586	Double(freed) / 1e9, evictedDirs.count,
	587	evictedChunks.values.map(\.count).reduce(0, +),
	588	Double(self.ledgerBytes) / 1e9)
	589	self.imgStateLock.lock()
	590	for k in evictedDirs {
	591	self.stripInfoCache[k] = nil
	592	}
	593	self.imgStateLock.unlock()
	594	for k in evictedDirs {
	595	self.enqueued.remove(k)
	596	}
	597	for c in DocumentContext.allLive {
	598	c.chunks.forget(keys: evictedDirs)
	599	for (key, idxs) in evictedChunks {
	600	c.chunks.noteEvicted(key: key, indices: idxs)
	601	}
	602	}
	603	self.evicting = false
	604	let ok = self.ledgerBytes + self.reservedBytes + need <= ceiling
	605	if !evictedDirs.isEmpty \|\| !evictedChunks.isEmpty {
	606	NotificationCenter.default.post(name: .mediaStatusChanged, object: nil)
	607	// Only re-pump when something was actually freed — a no-op
	608	// eviction re-pumping would loop pump → evict → pump forever.
	609	for c in DocumentContext.allLive { c.chunks.budgetChanged() }
	610	}
	611	completion(ok)
385	612	}
386	613	}
387	614	}
388	615
389		private static func directorySize(_ url: URL) -> Int64 {
	616	/// Delete leftovers no session references anymore: rescue-slice files
	617	/// (`rNNNNNN.mov` — their state is memory-only, so a relaunch can't know
	618	/// which part of the chunk they cover) and `.partial.mov` temps from
	619	/// builds a crash interrupted. Only files from BEFORE this process
	620	/// started — a slice the current session just built stays.
	621	private static func purgeSessionTransients(root: URL) {
	622	let fm = FileManager.default
	623	guard let en = fm.enumerator(at: root,
	624	includingPropertiesForKeys: [.contentModificationDateKey])
	625	else { return }
	626	for case let f as URL in en {
	627	let name = f.lastPathComponent
	628	let isRescue = name.hasPrefix("r") && name.hasSuffix(".mov") && name.count == 11
	629	&& f.deletingLastPathComponent().lastPathComponent == "chunks"
	630	let isTemp = name.hasSuffix(".partial.mov")
	631	guard isRescue \|\| isTemp else { continue }
	632	let m = (try? f.resourceValues(forKeys: [.contentModificationDateKey])
	633	.contentModificationDate) ?? .distantPast
	634	if m < processStart { try? fm.removeItem(at: f) }
	635	}
	636	}
	637
	638	static func directorySize(_ url: URL) -> Int64 {
390	639	var total: Int64 = 0
391	640	if let en = FileManager.default.enumerator(at: url, includingPropertiesForKeys: [.fileSizeKey]) {
392	641	for case let f as URL in en {
...	...	@@ -400,6 +649,46 @@ final class MediaPipeline {
400	649
401	650	struct RunResult { var exitCode: Int32; var stdout: String }
402	651
	652	/// Every child process currently running, so app teardown can take them
	653	/// down too. A killed Sequencer otherwise leaves its in-flight ffmpeg
	654	/// encodes running as orphans — and each one holds VideoToolbox decode
	655	/// sessions from a SHARED machine-wide pool. Enough accumulated orphans
	656	/// (a few rebuild-relaunch cycles' worth) and every AVPlayer in the next
	657	/// app instance silently renders BLACK: items park, seeks land,
	658	/// isReadyForDisplay says true, no error anywhere. Diagnosed 2026-07-11
	659	/// after the viewer went black with all state reporting healthy.
	660	private static var liveChildren: [Int32: Process] = [:]
	661	private static let childLock = NSLock()
	662
	663	/// Terminate every live child (normal quit AND SIGTERM — run.sh pkills
	664	/// the app on every rebuild, which is exactly how orphans were minted).
	665	static func terminateChildren() {
	666	childLock.lock()
	667	let children = Array(liveChildren.values)
	668	childLock.unlock()
	669	for p in children where p.isRunning { p.terminate() }
	670	}
	671
	672	/// Kill orphaned ffmpeg processes from a PREVIOUS Sequencer instance
	673	/// (crash, force-quit, kill -9 — anything terminateChildren couldn't
	674	/// catch). Identified by their command line referencing our cache root,
	675	/// so nothing else on the machine can match. Runs once at launch.
	676	static func reapOrphans(cacheRoot: URL) {
	677	let marker = cacheRoot.path
	678	DispatchQueue.global(qos: .utility).async {
	679	let r = run("/usr/bin/pgrep", ["-fl", "ffmpeg"])
	680	var killed = 0
	681	for line in r.stdout.split(separator: "\n") where line.contains(marker) {
	682	guard let pid = Int32(line.prefix(while: \.isNumber)) else { continue }
	683	kill(pid, SIGKILL)
	684	killed += 1
	685	}
	686	if killed > 0 {
	687	SeqLog.log("[cache] reaped %d orphaned ffmpeg encoder(s) from a previous instance", killed)
	688	}
	689	}
	690	}
	691
403	692	@discardableResult
404	693	static func run(_ path: String, _ args: [String],
405	694	duration: Double? = nil,
...	...	@@ -426,7 +715,13 @@ final class MediaPipeline {
426	715	}
427	716	do {
428	717	try p.run()
	718	childLock.lock()
	719	liveChildren[p.processIdentifier] = p
	720	childLock.unlock()
429	721	p.waitUntilExit()
	722	childLock.lock()
	723	liveChildren.removeValue(forKey: p.processIdentifier)
	724	childLock.unlock()
430	725	} catch {
431	726	return RunResult(exitCode: -1, stdout: "")
432	727	}

sequencer/Sources/Sequencer/Model.swift+36-9

...	...	@@ -142,16 +142,22 @@ struct ViewState: Codable, Equatable {
142	142	var laneScale: Double = 1
143	143	var snapping = true
144	144	var showFilmstrips = true
	145	var subtitles = true // clover-transcript captions overlay
145	146	var previewsOnLeft = false
146	147	var priorityPane: TrackRef? = nil
147	148	var fusionHidden = false
148	149	var fusionFocus = false
	150	/// Where the playhead was parked at save. Reopening resumes here, which
	151	/// also tells the proxy cache which neighbourhood to keep warm/protected
	152	/// for this project while its window is in the background.
	153	var playhead: Double = 0
149	154
150	155	init() {}
151	156
152	157	enum CodingKeys: String, CodingKey {
153	158	case hiddenTracks, focusedTracks, trackHeights, laneScale, snapping,
154		showFilmstrips, previewsOnLeft, priorityPane, fusionHidden, fusionFocus
	159	showFilmstrips, subtitles, previewsOnLeft, priorityPane,
	160	fusionHidden, fusionFocus, playhead
155	161	}
156	162	init(from decoder: Decoder) throws {
157	163	let c = try decoder.container(keyedBy: CodingKeys.self)
...	...	@@ -161,10 +167,12 @@ struct ViewState: Codable, Equatable {
161	167	laneScale = try c.decodeIfPresent(Double.self, forKey: .laneScale) ?? 1
162	168	snapping = try c.decodeIfPresent(Bool.self, forKey: .snapping) ?? true
163	169	showFilmstrips = try c.decodeIfPresent(Bool.self, forKey: .showFilmstrips) ?? true
	170	subtitles = try c.decodeIfPresent(Bool.self, forKey: .subtitles) ?? true
164	171	previewsOnLeft = try c.decodeIfPresent(Bool.self, forKey: .previewsOnLeft) ?? false
165	172	priorityPane = try c.decodeIfPresent(TrackRef.self, forKey: .priorityPane)
166	173	fusionHidden = try c.decodeIfPresent(Bool.self, forKey: .fusionHidden) ?? false
167	174	fusionFocus = try c.decodeIfPresent(Bool.self, forKey: .fusionFocus) ?? false
	175	playhead = try c.decodeIfPresent(Double.self, forKey: .playhead) ?? 0
168	176	}
169	177	}
170	178
...	...	@@ -341,8 +349,10 @@ struct MediaItem: Codable, Equatable, Identifiable {
341	349	var isAudio: Bool = false // audio-only file (no video stream)
342	350	var cacheKey: String = ""
343	351
344		var url: URL { URL(fileURLWithPath: path) }
345		var displayName: String { url.lastPathComponent }
	352	// isDirectory:false skips URL's hidden stat() — path lives on the NAS,
	353	// and per-draw stats of a cold network volume freeze the whole UI.
	354	var url: URL { URL(fileURLWithPath: path, isDirectory: false) }
	355	var displayName: String { (path as NSString).lastPathComponent }
346	356
347	357	init(path: String) { self.path = path }
348	358
...	...	@@ -418,6 +428,14 @@ struct Clip: Codable, Equatable, Identifiable {
418	428	/// Source time for a timeline moment inside the clip.
419	429	func sourceTime(at t: Double) -> Double { srcIn + (t - start) * speed }
420	430
	431	/// Inverse of `sourceTime(at:)`: the timeline moment inside the clip that
	432	/// shows source second `s`. Clamped to the clip's own span so it can't jump
	433	/// the playhead onto a neighbour.
	434	func timelineTime(forSource s: Double) -> Double {
	435	let t = speed != 0 ? start + (s - srcIn) / speed : start
	436	return min(max(t, start), end)
	437	}
	438
421	439	init(mediaId: UUID?, track: TrackRef, start: Double, srcIn: Double,
422	440	duration: Double, kind: ClipKind = .video, linkId: UUID? = nil,
423	441	board: Board? = nil) {
...	...	@@ -572,14 +590,23 @@ extension ProjectModel {
572	590	by: \.track)
573	591	for (tref, arr) in grouped {
574	592	if let ref, tref != ref { continue }
575		let sorted = arr.sorted { ($0.start, $0.id.uuidString) < ($1.start, $1.id.uuidString) }
	593	// Tiebreak on the id only when starts collide — building a
	594	// uuidString per comparison made sorting a dense lane allocate
	595	// thousands of strings.
	596	let sorted = arr.sorted {
	597	$0.start != $1.start ? $0.start < $1.start
	598	: $0.id.uuidString < $1.id.uuidString
	599	}
576	600	for i in 0..<sorted.count {
	601	let a = sorted[i]
577	602	for j in (i + 1)..<sorted.count {
578		let a = sorted[i], b = sorted[j]
579		if b.start < a.end - 1e-9 {
580		out.append(ClipOverlap(a: a, b: b, track: tref,
581		start: b.start, end: min(a.end, b.end)))
582		}
	603	let b = sorted[j]
	604	// Sorted by start: once b starts at/after a's end, every
	605	// later clip does too. Without this break the scan is
	606	// O(n²) per lane — and it runs on every gesture update.
	607	if b.start >= a.end - 1e-9 { break }
	608	out.append(ClipOverlap(a: a, b: b, track: tref,
	609	start: b.start, end: min(a.end, b.end)))
583	610	}
584	611	}
585	612	}

sequencer/Sources/Sequencer/PerfTest.swift+78-15

...	...	@@ -44,7 +44,6 @@ func runPerfTest(path: String) {
44	44	// runloop until the loads land, so we then measure real thumbnail blits.
45	45	func warmThumbnails() {
46	46	ctx.session.showFilmstrips = true
47		timeline.testSetScrolling(false)
48	47	NSGraphicsContext.saveGraphicsState()
49	48	NSGraphicsContext.current = gctx
50	49	for _ in 0..<5 {
...	...	@@ -57,20 +56,34 @@ func runPerfTest(path: String) {
57	56	NSGraphicsContext.restoreGraphicsState()
58	57	}
59	58
60		// Pan across the first half of the timeline over `frames` steps, timing each
61		// direct draw. Returns mean ms/frame.
62		func measure(scrolling: Bool, frames: Int = 120) -> Double {
63		timeline.testSetScrolling(scrolling)
	59	// Pan the timeline over `frames` steps, timing each direct draw. Returns
	60	// (median, p90) ms/frame — the median resists the I/O-contention spikes
	61	// that async thumbnail loads inject into a mean.
	62	//
	63	// Two pan patterns: `panPxPerFrame` nil teleports across half the project
	64	// (cache-hostile — approximates fresh zooms and scrubber jumps); a value
	65	// pans that many px per frame like a real scroll gesture.
	66	func measure(frames: Int = 120, panPxPerFrame: Double? = nil)
	67	-> (median: Double, p90: Double) {
64	68	NSGraphicsContext.saveGraphicsState()
65	69	NSGraphicsContext.current = gctx
66	70	defer { NSGraphicsContext.restoreGraphicsState() }
67	71	for _ in 0..<3 { timeline.testRedraw() } // warm up
68		let t0 = Date()
	72	var times: [Double] = []
	73	times.reserveCapacity(frames)
69	74	for i in 0..<frames {
70		timeline.testSetOrigin(panSpan * Double(i) / Double(frames))
	75	if let px = panPxPerFrame {
	76	timeline.testSetOrigin(panSpan * 0.25
	77	+ Double(i) * px / timeline.testPxPerSecond)
	78	} else {
	79	timeline.testSetOrigin(panSpan * Double(i) / Double(frames))
	80	}
	81	let t0 = DispatchTime.now().uptimeNanoseconds
71	82	timeline.testRedraw()
	83	times.append(Double(DispatchTime.now().uptimeNanoseconds - t0) / 1e6)
72	84	}
73		return Date().timeIntervalSince(t0) / Double(frames) * 1000
	85	times.sort()
	86	return (times[frames / 2], times[Int(Double(frames) * 0.9)])
74	87	}
75	88
76	89	// pxPerSecond values: fit-all (everything on screen at once) up through
...	...	@@ -84,7 +97,7 @@ func runPerfTest(path: String) {
84	97	("empty", 4000),
85	98	]
86	99	ctx.session.showFilmstrips = true
87		print("mode zoom px/s visible ms/frame (fps) thumbs/frame")
	100	print("mode zoom px/s visible med ms p90 ms (fps) thumbs/frame")
88	101	for (name, pps) in zooms {
89	102	timeline.testSetPxPerSecond(pps)
90	103	timeline.testSetOrigin(0)
...	...	@@ -93,17 +106,67 @@ func runPerfTest(path: String) {
93	106	// Count thumbnails actually blitted over one profiled pan pass.
94	107	DrawProf.on = true; DrawProf.thumbHits = 0
95	108	NSGraphicsContext.saveGraphicsState(); NSGraphicsContext.current = gctx
96		timeline.testSetScrolling(false)
97	109	for i in 0..<60 { timeline.testSetOrigin(panSpan * Double(i) / 60); timeline.testRedraw() }
98	110	NSGraphicsContext.restoreGraphicsState()
99	111	let thumbsPerFrame = DrawProf.thumbHits / 60
100	112	DrawProf.on = false
101		for (mode, scrolling) in [("detail ", false), ("scrolling", true)] {
102		let ms = measure(scrolling: scrolling)
103		print(String(format: "%@ %-9@ %7.2f %7d %8.2f %5.0f %6d",
104		mode, name as NSString, pps, visible, ms, 1000 / max(0.001, ms),
105		scrolling ? 0 : thumbsPerFrame))
	113	// A/B inside one process: the direct (Stage-1) path vs the tile cache,
	114	// measured seconds apart so thermal drift can't skew the comparison.
	115	// "scroll" pans 8 px/frame like a real gesture; "jump" teleports
	116	// half-project strides (cache-hostile worst case).
	117	let px8 = 8.0
	118	for (mode, disabled, pan) in [
	119	("direct-scroll", true, px8 as Double?),
	120	("tiled·-scroll", false, px8),
	121	("direct-jump··", true, nil),
	122	("tiled·-jump··", false, nil),
	123	] {
	124	TimelineView.tilesDisabled = disabled
	125	_ = measure(frames: 30, panPxPerFrame: pan) // warm/fill cache
	126	let ms = measure(panPxPerFrame: pan)
	127	print(String(format: "%@ %-9@ %7.2f %7d %8.2f %8.2f %5.0f %6d",
	128	mode, name as NSString, pps, visible, ms.median, ms.p90,
	129	1000 / max(0.001, ms.median), thumbsPerFrame))
106	130	}
	131	// Zoom simulation: a continuous pinch around this zoom level (±1.5×,
	132	// ~1.5%/frame like a real magnify stream). Every frame changes
	133	// pxPerSecond, so the tile cache can never hit — this is the pure
	134	// cold-render rate that 60 Hz zooming needs.
	135	TimelineView.tilesDisabled = false
	136	do {
	137	let anchor = panSpan * 0.25
	138	NSGraphicsContext.saveGraphicsState()
	139	NSGraphicsContext.current = gctx
	140	for _ in 0..<3 { timeline.testRedraw() }
	141	var times: [Double] = []
	142	DrawProf.on = true; DrawProf.reset()
	143	for i in 0..<120 {
	144	let phase = Double(i) / 120 * 4 * .pi
	145	let f = exp(sin(phase) * 0.4) // pps swings ×0.67…×1.5
	146	timeline.testSetPxPerSecond(pps * f)
	147	timeline.testSetOrigin(anchor)
	148	let t0 = DispatchTime.now().uptimeNanoseconds
	149	timeline.testRedraw()
	150	times.append(Double(DispatchTime.now().uptimeNanoseconds - t0) / 1e6)
	151	}
	152	DrawProf.on = false
	153	NSGraphicsContext.restoreGraphicsState()
	154	times.sort()
	155	print(String(format: "zoom·-pinch·· %-9@ %7.2f %7d %8.2f %8.2f %5.0f",
	156	name as NSString, pps, visible, times[60], times[108],
	157	1000 / max(0.001, times[60])))
	158	DrawProf.report(frames: 120) // per-phase cost of a cold zoom frame
	159	timeline.testSetPxPerSecond(pps)
	160	}
	161	// Per-section breakdown of a tiled pan pass at this zoom.
	162	DrawProf.on = true; DrawProf.reset()
	163	DrawProf.tileRenders = 0; DrawProf.tileBlits = 0
	164	_ = measure(frames: 60)
	165	DrawProf.on = false
	166	DrawProf.report(frames: 60)
	167	print(String(format: " tiles: %.1f blits, %.2f renders /frame",
	168	Double(DrawProf.tileBlits) / 60, Double(DrawProf.tileRenders) / 60))
	169	TimelineView.tilesDisabled = false
107	170	}
108	171	exit(0)
109	172	}

sequencer/Sources/Sequencer/PlaybackController.swift+81-10

...	...	@@ -51,6 +51,15 @@ final class PlaybackController {
51	51	/// 60 Hz timer keeps running for the app's lifetime.
52	52	deinit { timer?.invalidate() }
53	53
	54	/// Called from `DocumentContext.shutdown()` on document close: kill the timer
	55	/// now (while `ctx` is still alive) so no `tick()` fires against a context
	56	/// that's mid-teardown.
	57	func stop() {
	58	rate = 0
	59	timer?.invalidate()
	60	timer = nil
	61	}
	62
54	63	private func tick() {
55	64	// While paused nothing moves; edits and proxy completions push their
56	65	// own syncs, so idle costs nothing.
...	...	@@ -81,6 +90,7 @@ final class PlaybackController {
81	90	let now = playhead
82	91	let wasStopped = rate == 0
83	92	rate = newRate
	93	HangMonitor.playbackRate = newRate
84	94	if newRate == 0 {
85	95	pausedPlayhead = now
86	96	playbackStartPlayhead = nil
...	...	@@ -313,12 +323,16 @@ final class TrackPlayer {
313	323	// PAUSED: a swap is a pure visual flash with no playback
314	324	// benefit, so swap only to REVEAL a frame we otherwise
315	325	// can't show at all — an unplayable original (DNx) whose
316		// covering chunk has just landed. Never swap to merely
317		// sharpen a still, and never trade a playable original
318		// (crisper than any proxy for a still) down to a proxy.
	326	// covering chunk has just landed, or a playable original
	327	// that still hasn't managed to park on the frame (a slow
	328	// NAS seek — the cell is showing a stand-in or spinner
	329	// while the proxy could show the frame now). Never swap to
	330	// merely sharpen a still that's already on screen.
319	331	// Pending quality upgrades take effect on the next play/seek.
	332	let cur = player.currentTime().seconds
	333	let parkedOff = !cur.isFinite \|\| abs(cur - sourceTime) > 0.5
320	334	swap = sharperProxy && had == nil
321		&& !ctx.chunks.originalPlayable(media: media)
	335	&& (!ctx.chunks.originalPlayable(media: media) \|\| parkedOff)
322	336	} else {
323	337	// PLAYING: adopt the proxy the moment it covers the playhead
324	338	// (a NAS original may stutter), throttled so rapid
...	...	@@ -352,7 +366,11 @@ final class TrackPlayer {
352	366	/// pass) seeks it to the live position and resumes. Without the hold it
353	367	/// blips wrong content from the file's head — audibly so on the audio track.
354	368	private func installItem(_ item: AVPlayerItem) {
355		item.preferredForwardBufferDuration = lenientSync ? 8 : 1
	369	// Video buffer depth scales with the RAM budget (Settings → Global):
	370	// the default 2 GB keeps the old 1s; a workstation-sized budget buys
	371	// deeper read-ahead, which is what smooths NAS originals.
	372	item.preferredForwardBufferDuration = lenientSync ? 8
	373	: Double(min(8, max(1, FrameCache.ramGB / 2)))
356	374	let wasPlaying = player.rate != 0
357	375	player.replaceCurrentItem(with: item)
358	376	if wasPlaying { player.rate = 0 }
...	...	@@ -438,8 +456,13 @@ final class VideoTrackPlayer {
438	456	var currentClipId: UUID? { front.currentClipId }
439	457
440	458	/// Spin up the next clip's buffer this many seconds before its cut — enough
441		/// to load + decode the first frame even off a NAS original.
442		private static let preroll = 1.5
	459	/// to load + decode the first frame even off a NAS original or a stitched
	460	/// composition whose seek has to open a fresh chunk file.
	461	private static let preroll = 4.0
	462	/// Warm exact cut frames (heads AND tails) into the RAM frame cache when
	463	/// their boundary is within this many seconds of the playhead, so even a
	464	/// swap that outruns the preroll has the right frame to stand in.
	465	private static let warmRadius = 10.0
443	466
444	467	func sync(ref: TrackRef, playhead: Double, rate: Double,
445	468	playheadMoved: Bool, force: Bool) {
...	...	@@ -462,9 +485,11 @@ final class VideoTrackPlayer {
462	485	}
463	486	}
464	487
465		// BACK: preroll the next different-media clip when its cut is imminent,
466		// parked (rate 0) and muted at its first frame. Forward playback only —
467		// a reverse/scrub cut falls back to the plain (tiny-gap) swap.
	488	// BACK: preroll the boundary clip when its cut is imminent, parked
	489	// (rate 0) and muted at the frame the cut lands on: forward playback
	490	// prerolls the NEXT different-media clip at its first frame; reverse
	491	// prerolls the PREVIOUS one at its last, so a backwards cut is just as
	492	// gapless.
468	493	var buffering = false
469	494	if rate >= 0, let next = nextDifferentClip(on: ref, after: playhead, current: cur),
470	495	next.start - playhead <= Self.preroll,
...	...	@@ -475,10 +500,46 @@ final class VideoTrackPlayer {
475	500	back.player.isMuted = true
476	501	back.syncTime(expected: next.srcIn, rate: 0, force: false)
477	502	buffering = true
	503	} else if rate < 0, let prev = prevDifferentClip(on: ref, before: playhead, current: cur),
	504	playhead - prev.end <= Self.preroll,
	505	let prevMedia = project.media(prev.mediaId) {
	506	let tail = max(prev.srcIn, prev.sourceTime(at: prev.end) - 0.05)
	507	if back.currentClipId != prev.id {
	508	back.setClip(prev, media: prevMedia, sourceTime: tail)
	509	}
	510	back.player.isMuted = true
	511	back.syncTime(expected: tail, rate: 0, force: false)
	512	buffering = true
478	513	}
479	514	if !buffering, back.currentClipId != nil {
480	515	back.setClip(nil, media: nil) // release the idle buffer
481	516	}
	517
	518	warmBoundaryFrames(ref: ref, playhead: playhead, project: project)
	519	}
	520
	521	/// Warm the exact frames every nearby cut will need into the RAM frame
	522	/// cache — clip heads for forward crossings, clip tails for reverse — so
	523	/// the beat between "boundary crossed" and "player ready" shows the real
	524	/// frame instead of a filmstrip thumb or a spinner. Self-deduping (the
	525	/// cache remembers, decodes are backgrounded), so per-tick calls are cheap.
	526	private func warmBoundaryFrames(ref: TrackRef, playhead: Double, project: ProjectModel) {
	527	for clip in project.clips where clip.track == ref && clip.kind == .video {
	528	guard abs(clip.start - playhead) <= Self.warmRadius
	529	\|\| abs(clip.end - playhead) <= Self.warmRadius,
	530	let media = project.media(clip.mediaId), !media.isAudio else { continue }
	531	if abs(clip.start - playhead) <= Self.warmRadius {
	532	FrameCache.shared.warm(
	533	mediaKey: media.cacheKey, at: clip.srcIn,
	534	source: ctx.chunks.frameSource(media: media, sourceTime: clip.srcIn))
	535	}
	536	if abs(clip.end - playhead) <= Self.warmRadius {
	537	let tail = max(clip.srcIn, clip.sourceTime(at: clip.end) - 0.05)
	538	FrameCache.shared.warm(
	539	mediaKey: media.cacheKey, at: tail,
	540	source: ctx.chunks.frameSource(media: media, sourceTime: tail))
	541	}
	542	}
482	543	}
483	544
484	545	/// The next clip on this track (in time) whose media differs from `current`
...	...	@@ -492,6 +553,16 @@ final class VideoTrackPlayer {
492	553	.min { $0.start < $1.start }
493	554	}
494	555
	556	/// The mirror for reverse playback: the previous clip (in time) whose media
	557	/// differs — the cut a rewinding playhead will cross next.
	558	private func prevDifferentClip(on ref: TrackRef, before t: Double,
	559	current: Clip?) -> Clip? {
	560	ctx.store.project.clips
	561	.filter { $0.track == ref && $0.kind == .video && $0.end < t + 1e-6
	562	&& $0.mediaId != current?.mediaId }
	563	.max { $0.end < $1.end }
	564	}
	565
495	566	func clear() {
496	567	a.player.replaceCurrentItem(with: nil)
497	568	b.player.replaceCurrentItem(with: nil)

sequencer/Sources/Sequencer/SessionState.swift+13

...	...	@@ -12,6 +12,10 @@ final class SessionState {
12	12
13	13	var snapping = true { didSet { postViewOptions() } }
14	14	var showFilmstrips = true { didSet { postViewOptions() } }
	15	/// Show the clover-recording transcript as synchronized captions over the
	16	/// viewer (only ever visible when a `cam.mov` with a sibling `transcript.json`
	17	/// is under the playhead).
	18	var subtitlesEnabled = true { didSet { postViewOptions() } }
15	19	/// Vertical zoom: multiplies the base lane height for all tracks.
16	20	var laneScale: CGFloat = 1 {
17	21	didSet {
...	...	@@ -24,6 +28,11 @@ final class SessionState {
24	28
25	29	var hiddenTracks: Set<TrackRef> = [] { didSet { postViewOptions() } }
26	30	var focusedTracks: Set<TrackRef> = [] { didSet { postViewOptions() } }
	31	/// The timeline span currently on screen (set by TimelineView as it
	32	/// scrolls/zooms). The proxy builder treats it as a heat anchor — the
	33	/// user scrubs inside what they can see. Not persisted; no notification
	34	/// (read lazily by the chunk scheduler).
	35	var visibleTimeRange: ClosedRange<Double>?
27	36	/// The Fusion comps band gets its own hide/focus.
28	37	var fusionHidden = false { didSet { postViewOptions() } }
29	38	var fusionFocus = false { didSet { postViewOptions() } }
...	...	@@ -101,10 +110,12 @@ final class SessionState {
101	110	v.laneScale = Double(laneScale)
102	111	v.snapping = snapping
103	112	v.showFilmstrips = showFilmstrips
	113	v.subtitles = subtitlesEnabled
104	114	v.previewsOnLeft = previewsOnLeft
105	115	v.priorityPane = priorityPane
106	116	v.fusionHidden = fusionHidden
107	117	v.fusionFocus = fusionFocus
	118	v.playhead = ctx.playback.playhead
108	119	return v
109	120	}
110	121
...	...	@@ -117,10 +128,12 @@ final class SessionState {
117	128	laneScale = CGFloat(v.laneScale)
118	129	snapping = v.snapping
119	130	showFilmstrips = v.showFilmstrips
	131	subtitlesEnabled = v.subtitles
120	132	previewsOnLeft = v.previewsOnLeft
121	133	priorityPane = v.priorityPane
122	134	fusionHidden = v.fusionHidden
123	135	fusionFocus = v.fusionFocus
	136	if v.playhead > 0 { ctx.playback.seek(to: v.playhead) }
124	137	}
125	138
126	139	private func postViewOptions() {

sequencer/Sources/Sequencer/Store.swift+85-14

...	...	@@ -1,4 +1,4 @@
1		import Foundation
	1	import AppKit
2	2
3	3	extension Notification.Name {
4	4	static let projectChanged = Notification.Name("projectChanged")
...	...	@@ -36,8 +36,18 @@ final class Store {
36	36	var playhead: Double
37	37	}
38	38
39		private var undoStack: [Snapshot] = []
40		private var redoStack: [Snapshot] = []
	39	/// One step on the undo timeline. Model edits and storyboard DRAWING edits
	40	/// share this single stack so ⌘Z / ⌘⇧Z step through them in the exact order
	41	/// they happened — regardless of which window is focused — and drawing is
	42	/// redoable like everything else. (Raster pixels live in `BoardStore`, out of
	43	/// the value-type model; the entry just carries the image to restore.)
	44	private enum UndoEntry {
	45	case model(Snapshot)
	46	case raster(boardId: UUID, image: NSImage?) // nil image = board was blank
	47	}
	48
	49	private var undoStack: [UndoEntry] = []
	50	private var redoStack: [UndoEntry] = []
41	51	private var gestureBase: Snapshot?
42	52
43	53	var canUndo: Bool { !undoStack.isEmpty \|\| gestureBase != nil }
...	...	@@ -70,6 +80,7 @@ final class Store {
70	80	project = copy
71	81	pruneSelection()
72	82	changed()
	83	noteEditLocus(before: before.model, after: copy)
73	84	}
74	85
75	86	/// Continuous-gesture mutations (drags): one undo entry for the whole
...	...	@@ -97,24 +108,58 @@ final class Store {
97	108	/// base snapshot and would discard the gesture's changes.
98	109	func endGesture(finalize: ((inout ProjectModel) -> Void)? = nil) {
99	110	guard let base = gestureBase else { return }
	111	// Did the drag move anything on screen (mid-gesture posts drew it)?
	112	let diverged = project != base.model
100	113	var copy = project
101	114	finalize?(&copy)
102	115	copy.normalizeStoryboards()
103	116	// A drag that vacated a bottom lane leaves it as an ephemeral drop
104	117	// target — collapse it (interior lanes and the clip's own lane stay).
105	118	copy.pruneTrailingEmptyTracks()
106		if copy != project {
107		project = copy
108		post(.projectChanged)
109		}
	119	project = copy
110	120	gestureBase = nil
	121	// Post `.projectChanged` exactly once. A net change goes through
	122	// `changed()` (undo + dirty + the post). A net-ZERO drag that still moved
	123	// things mid-gesture (dragged out and back, ephemeral lane pruned) has no
	124	// undo entry, but the view is drawing the mid-gesture state — refresh it.
	125	// A no-op gesture (a click that never dragged) posts nothing.
111	126	if project != base.model {
112	127	pushUndo(base)
	128	noteEditLocus(before: base.model, after: project)
113	129	pruneSelection()
114	130	changed()
	131	} else if diverged {
	132	post(.projectChanged)
115	133	}
116	134	}
117	135
	136	/// Report where an edit landed on the timeline — the proxy builder keeps
	137	/// chunks around recent edit sites warm (built early, evicted late), since
	138	/// editors scrub and re-play around where they're cutting.
	139	private func noteEditLocus(before: ProjectModel, after: ProjectModel) {
	140	var old: [UUID: Clip] = [:]
	141	for c in before.clips { old[c.id] = c }
	142	var times: [Double] = []
	143	func add(_ t: Double) {
	144	guard times.count < 4,
	145	!times.contains(where: { abs($0 - t) < 30 }) else { return }
	146	times.append(t)
	147	}
	148	for c in after.clips where c.kind == .video && old[c.id] != c {
	149	if times.count >= 4 { break }
	150	guard let o = old[c.id] else { add(c.start); continue } // new clip
	151	// Warm the EDGE that moved: a right-trim on a long clip should
	152	// anchor at its out point, not the (possibly minutes-away) head.
	153	let durChanged = abs(o.duration - c.duration) > 1e-9
	154	if durChanged, abs(o.end - c.end) > 1e-9 { add(c.end) } // tail edit
	155	if abs(o.srcIn - c.srcIn) > 1e-9 \|\| abs(o.start - c.start) > 1e-9
	156	\|\| !durChanged {
	157	add(c.start) // head edit, slip, move, or non-geometry change
	158	}
	159	}
	160	ctx.chunks.noteEdits(times: times)
	161	}
	162
118	163	/// Live, non-undoable edit for a floating control that has no discrete
119	164	/// start/end (the colour picker). Unlike a gesture it holds no open state,
120	165	/// so timeline edits mid-preview can't trip the gesture precondition.
...	...	@@ -143,19 +188,45 @@ final class Store {
143	188
144	189	func undo() {
145	190	if gestureBase != nil { cancelGesture(); return }
146		guard let prev = undoStack.popLast() else { return }
147		redoStack.append(snapshot())
148		restore(prev)
	191	guard let entry = undoStack.popLast() else { return }
	192	switch entry {
	193	case .model(let snap):
	194	redoStack.append(.model(snapshot()))
	195	restore(snap)
	196	case .raster(let boardId, let image):
	197	// Swap: what's on screen now becomes the redo target; restore the
	198	// stored (pre-edit) drawing.
	199	redoStack.append(.raster(boardId: boardId, image: ctx.boards.rasterSnapshot(boardId)))
	200	ctx.boards.applyRaster(image, boardId: boardId)
	201	}
149	202	}
150	203
151	204	func redo() {
152		guard let next = redoStack.popLast() else { return }
153		undoStack.append(snapshot())
154		restore(next)
	205	guard let entry = redoStack.popLast() else { return }
	206	switch entry {
	207	case .model(let snap):
	208	undoStack.append(.model(snapshot()))
	209	restore(snap)
	210	case .raster(let boardId, let image):
	211	undoStack.append(.raster(boardId: boardId, image: ctx.boards.rasterSnapshot(boardId)))
	212	ctx.boards.applyRaster(image, boardId: boardId)
	213	}
	214	}
	215
	216	/// Register a storyboard drawing edit on the shared undo timeline — called by
	217	/// `BoardStore.endStroke` after it commits a stroke. `before` is the drawing
	218	/// as it stood BEFORE the stroke, so undo restores it.
	219	func recordRasterEdit(boardId: UUID, before: NSImage?) {
	220	undoStack.append(.raster(boardId: boardId, image: before))
	221	if undoStack.count > 500 { undoStack.removeFirst() }
	222	redoStack.removeAll()
	223	// The stroke already marked the document dirty (via noteRasterChanged);
	224	// this refreshes the Undo menu's enabled state.
	225	post(.documentStateChanged)
155	226	}
156	227
157	228	private func pushUndo(_ snapshot: Snapshot) {
158		undoStack.append(snapshot)
	229	undoStack.append(.model(snapshot))
159	230	if undoStack.count > 500 { undoStack.removeFirst() }
160	231	redoStack.removeAll()
161	232	}

sequencer/Sources/Sequencer/Storyboard.swift+18-30

...	...	@@ -134,9 +134,9 @@ final class BoardStore {
134	134	// Board coordinates everywhere: top-left origin, y down. The engine owns
135	135	// the y-flip into image space so callers never think about it.
136	136	private var workingRasters: [UUID: NSImage] = [:]
137		private var strokeUndo: [UUID: [NSImage?]] = [:]
138		/// Boards in the order strokes were committed (global ⌘Z routing).
139		private(set) var strokeHistory: [UUID] = []
	137	/// Pre-stroke drawing captured at `beginStroke`, used by `endStroke` to push
	138	/// one undo entry onto the shared `Store` timeline.
	139	private var pendingStrokeBefore: [UUID: NSImage?] = [:]
140	140
141	141	/// Raster to DISPLAY: the in-progress stroke image when one is active.
142	142	func displayRaster(_ boardId: UUID) -> NSImage? {
...	...	@@ -153,10 +153,9 @@ final class BoardStore {
153	153	}
154	154
155	155	func beginStroke(board: Board) {
156		var stack = strokeUndo[board.id] ?? []
157		stack.append(rasterImage(board.id)?.copy() as? NSImage)
158		if stack.count > 24 { stack.removeFirst() }
159		strokeUndo[board.id] = stack
	156	// Remember the pre-stroke drawing so the commit can register one undo
	157	// step on the shared timeline.
	158	pendingStrokeBefore[board.id] = rasterImage(board.id)?.copy() as? NSImage
160	159	workingRasters[board.id] = (rasterImage(board.id)?.copy() as? NSImage)
161	160	?? blankRaster(size: board.size)
162	161	}
...	...	@@ -192,34 +191,23 @@ final class BoardStore {
192	191	func endStroke(board: Board) {
193	192	guard let img = workingRasters.removeValue(forKey: board.id) else { return }
194	193	saveRaster(img, boardId: board.id)
195		strokeHistory.append(board.id)
196		if strokeHistory.count > 48 { strokeHistory.removeFirst() }
197		NotificationCenter.default.post(name: .mediaStatusChanged, object: nil)
	194	// Register the completed stroke on the shared undo timeline.
	195	let before = pendingStrokeBefore.removeValue(forKey: board.id) ?? nil
	196	ctx.store.recordRasterEdit(boardId: board.id, before: before)
	197	NotificationCenter.default.post(name: .mediaStatusChanged, object: nil, userInfo: ["scene": true])
198	198	}
199	199
200		func canUndoStroke(_ boardId: UUID) -> Bool {
201		!(strokeUndo[boardId] ?? []).isEmpty
202		}
203		var canUndoAnyStroke: Bool {
204		strokeHistory.last.map(canUndoStroke) ?? false
	200	/// A copy of the current drawing for the undo timeline (nil = blank board).
	201	func rasterSnapshot(_ boardId: UUID) -> NSImage? {
	202	rasterImage(boardId)?.copy() as? NSImage
205	203	}
206	204
207		@discardableResult
208		func undoStroke(_ boardId: UUID) -> Bool {
209		guard var stack = strokeUndo[boardId], let prev = stack.popLast() else { return false }
210		strokeUndo[boardId] = stack
	205	/// Restore a drawing captured by `rasterSnapshot` (undo/redo of a stroke),
	206	/// dropping any in-progress stroke and refreshing the editor + viewer.
	207	func applyRaster(_ image: NSImage?, boardId: UUID) {
211	208	workingRasters.removeValue(forKey: boardId)
212		saveRaster(prev, boardId: boardId)
213		if let i = strokeHistory.lastIndex(of: boardId) { strokeHistory.remove(at: i) }
214		NotificationCenter.default.post(name: .mediaStatusChanged, object: nil)
215		return true
216		}
217
218		/// Undo the most recent stroke on any board.
219		@discardableResult
220		func undoLastStroke() -> Bool {
221		guard let boardId = strokeHistory.last else { return false }
222		return undoStroke(boardId)
	209	saveRaster(image, boardId: boardId)
	210	NotificationCenter.default.post(name: .projectChanged, object: nil)
223	211	}
224	212
225	213	/// Wipe the drawing layer (undoable as one stroke).

sequencer/Sources/Sequencer/StoryboardEditor.swift-18

...	...	@@ -132,15 +132,6 @@ final class StoryboardEditor: NSObject, NSWindowDelegate {
132	132	private var colorWell: NSColorWell?
133	133
134	134	var isKeyEditor: Bool { window != nil && NSApp.keyWindow === window }
135		var canUndoRaster: Bool { isKeyEditor && (canvas?.canUndoRaster ?? false) }
136
137		/// Raster strokes undo in their own lane while the editor is key; shape
138		/// edits ride the global Store undo like everything else.
139		func undoRasterIfKey() -> Bool {
140		guard canUndoRaster, let canvas else { return false }
141		canvas.undoRaster()
142		return true
143		}
144	135
145	136	/// Open on a panel belonging to `ctx`'s document. The single editor window
146	137	/// re-targets to whichever document asked for it.
...	...	@@ -381,9 +372,6 @@ final class BoardCanvas: NSView {
381	372	// Raster stroke state (pixels live in BoardStore's shared stroke engine)
382	373	private var strokeActive = false
383	374	private var lastStrokePoint: CGPoint?
384		var canUndoRaster: Bool {
385		board.map { boards.canUndoStroke($0.id) } ?? false
386		}
387	375
388	376	// Shape gesture state
389	377	private enum ShapeDrag { case none, create, move, resize }
...	...	@@ -596,12 +584,6 @@ final class BoardCanvas: NSView {
596	584
597	585	// MARK: Raster strokes (BoardStore's engine does the pixel work)
598	586
599		func undoRaster() {
600		guard let board else { return }
601		boards.undoStroke(board.id)
602		needsDisplay = true
603		}
604
605	587	private func strokeSegment(from a: CGPoint, to b: CGPoint, pressure: CGFloat) {
606	588	guard let board, let width = tool.strokeWidth else { return }
607	589	boards.strokeSegment(

sequencer/Sources/Sequencer/Theme.swift+23

...	...	@@ -84,4 +84,27 @@ enum Theme {
84	84	static var dragHint: NSColor {
85	85	pick(NSColor(calibratedWhite: 0.3, alpha: 1), NSColor(calibratedWhite: 0.55, alpha: 1))
86	86	}
	87
	88	// Optimization strip (the thin band under the ruler). Muted so a mostly
	89	// red/yellow strip informs rather than alarms.
	90	/// Proxy built at the full preview-quality target.
	91	static var stripFull: NSColor {
	92	pick(NSColor(calibratedHue: 0.36, saturation: 0.70, brightness: 0.62, alpha: 1),
	93	NSColor(calibratedHue: 0.36, saturation: 0.65, brightness: 0.60, alpha: 1))
	94	}
	95	/// Proxy built below target — usable now, an upgrade is still queued.
	96	static var stripUsable: NSColor {
	97	pick(NSColor(calibratedHue: 0.36, saturation: 0.50, brightness: 0.42, alpha: 1),
	98	NSColor(calibratedHue: 0.36, saturation: 0.40, brightness: 0.72, alpha: 1))
	99	}
	100	/// Building right now (or a rescue slice standing in).
	101	static var stripBuilding: NSColor {
	102	pick(NSColor(calibratedHue: 0.13, saturation: 0.80, brightness: 0.72, alpha: 1),
	103	NSColor(calibratedHue: 0.13, saturation: 0.85, brightness: 0.80, alpha: 1))
	104	}
	105	/// No proxy on disk (never built, evicted, or failed).
	106	static var stripMissing: NSColor {
	107	pick(NSColor(calibratedHue: 0.01, saturation: 0.65, brightness: 0.48, alpha: 1),
	108	NSColor(calibratedHue: 0.01, saturation: 0.55, brightness: 0.75, alpha: 1))
	109	}
87	110	}

sequencer/Sources/Sequencer/TimelineView.swift+1119-230

...	...	@@ -7,8 +7,13 @@ enum DrawProf {
7	7	static var acc: [String: Double] = [:]
8	8	static var order: [String] = []
9	9	static var thumbHits = 0 // filmstrip images actually blitted (cache hits)
	10	static var tileRenders = 0 // scene tiles rasterized (cache misses)
	11	static var tileBlits = 0 // scene tiles blitted (cache hits + fresh)
10	12	@inline(__always) static func t<T>(_ label: String, _ body: () -> T) -> T {
11		if !on { return body() }
	13	// Main-thread only: lanes rasterize in parallel, and racing the
	14	// accumulator dictionaries would crash. Off-main work is simply
	15	// not attributed (the enclosing main-thread section still is).
	16	if !on \|\| !Thread.isMainThread { return body() }
12	17	let t0 = DispatchTime.now().uptimeNanoseconds
13	18	let r = body()
14	19	let dt = Double(DispatchTime.now().uptimeNanoseconds - t0) / 1e6
...	...	@@ -55,10 +60,26 @@ final class TimelineView: NSView {
55	60	// New document ⇒ new model; the scene cache must rebuild even though
56	61	// no `.projectChanged` fires for the context swap itself.
57	62	sceneDirty = true
	63	stripKey = nil
	64	laneRefsCache = nil
	65	flushTiles()
58	66	}
59	67	}
60	68	private var store: Store { ctx.store }
61	69	private var project: ProjectModel { ctx.store.project }
	70
	71	/// The model's `laneRefs` getter scans EVERY clip (`hasStoryboard`) —
	72	/// O(clips). The draw path reaches it per clip drawn (`drawClip →
	73	/// clipRect → laneRect`), which is quadratic on big projects: 98% CPU
	74	/// redraw storms. Cache it; invalidated on `.projectChanged`/
	75	/// `.viewOptionsChanged` (redraw()) and on document swap (ctx.didSet).
	76	private var laneRefsCache: [TrackRef]?
	77	private var laneRows: [TrackRef] {
	78	if let rows = laneRefsCache { return rows }
	79	let rows = project.laneRefs
	80	laneRefsCache = rows
	81	return rows
	82	}
62	83	private var playback: PlaybackController { ctx.playback }
63	84	private var comps: FusionComps { ctx.comps }
64	85	private var boards: BoardStore { ctx.boards }
...	...	@@ -72,12 +93,21 @@ final class TimelineView: NSView {
72	93	override init(frame: NSRect) {
73	94	super.init(frame: frame)
74	95	registerForDraggedTypes([.fileURL])
75		for name: Notification.Name in [.projectChanged, .selectionChanged,
76		.mediaStatusChanged, .viewOptionsChanged,
77		.compsChanged] {
	96	// Only model/view-option changes invalidate the grouped-clip scene
	97	// cache. Selection changes just refresh the link-mate cache, and
	98	// media-status/comps changes (thumbnails landing, comps rescans) only
	99	// need a repaint — none of them regroup or re-sort thousands of clips.
	100	for name: Notification.Name in [.projectChanged, .viewOptionsChanged] {
78	101	NotificationCenter.default.addObserver(self, selector: #selector(redraw),
79	102	name: name, object: nil)
80	103	}
	104	NotificationCenter.default.addObserver(self, selector: #selector(selectionRedraw),
	105	name: .selectionChanged, object: nil)
	106	NotificationCenter.default.addObserver(self, selector: #selector(mediaRedraw(_:)),
	107	name: .mediaStatusChanged, object: nil)
	108	// The comps band isn't tiled — a comps rescan is repaint-only.
	109	NotificationCenter.default.addObserver(self, selector: #selector(repaintOnly),
	110	name: .compsChanged, object: nil)
81	111	// Per-document: bound against the current (headless) ctx here, re-bound
82	112	// when a real ctx is injected (see `ctx.didSet`).
83	113	ctx.notify.addObserver(self, selector: #selector(playheadMoved),
...	...	@@ -88,7 +118,37 @@ final class TimelineView: NSView {
88	118
89	119	required init?(coder: NSCoder) { fatalError() }
90	120
91		@objc private func redraw() { sceneDirty = true; needsDisplay = true }
	121	@objc private func redraw() {
	122	sceneDirty = true
	123	stripKey = nil
	124	laneRefsCache = nil
	125	flushTiles()
	126	needsDisplay = true
	127	}
	128
	129	@objc private func repaintOnly() { needsDisplay = true }
	130
	131	/// `.mediaStatusChanged` is posted for two very different things: scene
	132	/// pixels changing (a filmstrip/waveform/board raster landed — posts carry
	133	/// `scene: true`) and proxy-chunk bookkeeping (status bar / viewer badges —
	134	/// no timeline pixels). Only the former invalidates the tile cache; chunk
	135	/// churn during playback must not force full scene re-renders.
	136	@objc private func mediaRedraw(_ note: Notification) {
	137	if note.userInfo?["scene"] != nil { flushTiles() }
	138	stripKey = nil // chunk states changed — recompute the strip's runs
	139	needsDisplay = true
	140	}
	141
	142	@objc private func selectionRedraw() {
	143	// Link-mates of the selection outline aqua; recompute just that set —
	144	// a selection click must not regroup/re-sort the whole project.
	145	if !sceneDirty {
	146	linkedSelectionCache = project.expandLinks(store.selection)
	147	.subtracting(store.selection)
	148	}
	149	flushTiles() // selection tint/borders are baked into the rasters
	150	needsDisplay = true
	151	}
92	152
93	153	@objc private func playheadMoved() {
94	154	// Auto-follow while playing.
...	...	@@ -127,24 +187,31 @@ final class TimelineView: NSView {
127	187	}
128	188	private var frameDur: Double { 1.0 / project.fps }
129	189
	190	/// The optimization strip: a thin band under the ruler showing, per
	191	/// timeline column, how optimized the media the visible tracks need there
	192	/// is (see drawOptimizeStrip).
	193	private let stripH: CGFloat = 5
130	194	private var fusionBandH: CGFloat { comps.visible ? 46 : 0 }
131		private var lanesTop: CGFloat { rulerH + fusionBandH }
	195	private var fusionTop: CGFloat { rulerH + stripH }
	196	private var lanesTop: CGFloat { rulerH + stripH + fusionBandH }
132	197
133	198	private func laneHeight(_ ref: TrackRef) -> CGFloat {
134		max(24, baseLaneH * session.laneScale * (session.trackHeights[ref] ?? 1))
	199	// Device-pixel quantized so lane rasters (scene tiles) blit without
	200	// resampling; the ≤ half-device-pixel rounding is imperceptible.
	201	quantized(max(24, baseLaneH * session.laneScale * (session.trackHeights[ref] ?? 1)))
135	202	}
136		private var defaultLaneH: CGFloat { max(24, baseLaneH * session.laneScale) }
	203	private var defaultLaneH: CGFloat { quantized(max(24, baseLaneH * session.laneScale)) }
137	204
138	205	/// Total height of all lanes (for vertical scroll clamping).
139	206	private var lanesContentHeight: CGFloat {
140		project.laneRefs.reduce(laneGap) { $0 + laneHeight($1) + laneGap }
	207	laneRows.reduce(laneGap) { $0 + laneHeight($1) + laneGap }
141	208	}
142	209	private var maxScrollY: CGFloat {
143	210	max(0, lanesContentHeight - (bounds.height - lanesTop) + defaultLaneH)
144	211	}
145	212
146	213	private func laneRect(row: Int) -> NSRect {
147		let rows = project.laneRefs
	214	let rows = laneRows
148	215	var y = lanesTop + laneGap - scrollY
149	216	for (i, ref) in rows.enumerated() {
150	217	let h = laneHeight(ref)
...	...	@@ -161,7 +228,7 @@ final class TimelineView: NSView {
161	228	private func rowAt(y: CGFloat) -> Int? {
162	229	guard y > lanesTop else { return nil }
163	230	var yy = lanesTop + laneGap - scrollY
164		let rows = project.laneRefs
	231	let rows = laneRows
165	232	for (i, ref) in rows.enumerated() {
166	233	let h = laneHeight(ref)
167	234	if y < yy + h + laneGap { return i }
...	...	@@ -173,7 +240,7 @@ final class TimelineView: NSView {
173	240	/// Row whose bottom edge is under the cursor (for track-height resizing).
174	241	private func trackBoundaryAt(y: CGFloat) -> Int? {
175	242	guard y > lanesTop else { return nil }
176		let rows = project.laneRefs
	243	let rows = laneRows
177	244	var yy = lanesTop + laneGap - scrollY
178	245	for (i, ref) in rows.enumerated() {
179	246	yy += laneHeight(ref)
...	...	@@ -191,15 +258,17 @@ final class TimelineView: NSView {
191	258
192	259	/// The lane shown at a row, or nil past the last real lane (ghost rows).
193	260	private func laneRef(row: Int) -> TrackRef? {
194		let rows = project.laneRefs
	261	let rows = laneRows
195	262	return rows.indices.contains(row) ? rows[row] : nil
196	263	}
197	264
198	265	private func clipAt(point: NSPoint) -> (clip: Clip, row: Int)? {
199	266	guard let row = rowAt(y: point.y), let ref = laneRef(row: row) else { return nil }
	267	// The cached per-lane arrays are already start-sorted — no need to
	268	// re-filter and re-sort the whole project per mouse event.
	269	rebuildSceneIfNeeded()
200	270	// Later clips draw on top, so hit-test in reverse.
201		for clip in project.clips.filter({ $0.track == ref })
202		.sorted(by: { $0.start < $1.start }).reversed() {
	271	for clip in (clipsByLane[ref] ?? []).reversed() {
203	272	if clipRect(clip, row: row).contains(point) { return (clip, row) }
204	273	}
205	274	return nil
...	...	@@ -207,7 +276,8 @@ final class TimelineView: NSView {
207	276
208	277	private func overlapAt(point: NSPoint) -> ClipOverlap? {
209	278	guard let row = rowAt(y: point.y), let ref = laneRef(row: row) else { return nil }
210		for o in project.overlaps(on: ref) {
	279	rebuildSceneIfNeeded()
	280	for o in overlapsByLane[ref] ?? [] {
211	281	let lane = laneRect(row: row)
212	282	let r = NSRect(x: xFor(o.start), y: lane.minY,
213	283	width: max(2, xFor(o.end) - xFor(o.start)), height: lane.height)
...	...	@@ -228,6 +298,16 @@ final class TimelineView: NSView {
228	298	// large project is now a redraw of cached geometry, not a full recompute.
229	299	private var clipsByLane: [TrackRef: [Clip]] = [:]
230	300	private var overlapsByLane: [TrackRef: [ClipOverlap]] = [:]
	301	/// Ids of clips that are part of an overlap, per lane — hoisted out of
	302	/// `drawLane`, which used to rebuild this Set per lane per frame.
	303	private var overlapIdsByLane: [TrackRef: Set<UUID>] = [:]
	304	/// Longest clip duration per lane — bounds the binary-searched draw/culling
	305	/// window (a clip can start at most this far left of the view and still be
	306	/// visible).
	307	private var maxClipDurByLane: [TrackRef: Double] = [:]
	308	/// `project.timelineDuration` scans every clip; cached here so per-frame
	309	/// chrome (scrollbars, origin clamping) doesn't rescan 4k+ clips.
	310	private var cachedTimelineDuration: Double = 0
231	311	private var mediaById: [UUID: MediaItem] = [:]
232	312	private var sceneDirty = true
233	313
...	...	@@ -239,6 +319,43 @@ final class TimelineView: NSView {
239	319	.foregroundColor: NSColor(calibratedWhite: 0.92, alpha: 1),
240	320	]
241	321
	322	/// Clip titles as cached CTLines. `NSString.draw` runs a full CoreText
	323	/// layout per call — ~200 visible labels re-laid-out every cold frame,
	324	/// even though a multicam project has a handful of distinct names. Layout
	325	/// once per distinct title, then `CTLineDraw` is a glyph blit. Capped:
	326	/// titles are media names + panel names, a small closed set in practice.
	327	private static var titleLineCache: [String: (line: CTLine, ascent: CGFloat)] = [:]
	328	private static let titleLineLock = NSLock() // lanes rasterize in parallel
	329	private static func titleLine(_ s: String) -> (line: CTLine, ascent: CGFloat) {
	330	titleLineLock.lock()
	331	defer { titleLineLock.unlock() }
	332	if let c = titleLineCache[s] { return c }
	333	if titleLineCache.count > 512 { titleLineCache.removeAll(keepingCapacity: true) }
	334	let line = CTLineCreateWithAttributedString(
	335	NSAttributedString(string: s, attributes: titleAttrs))
	336	var ascent: CGFloat = 0
	337	CTLineGetTypographicBounds(line, &ascent, nil, nil)
	338	let entry = (line, ascent)
	339	titleLineCache[s] = entry
	340	return entry
	341	}
	342
	343	/// Draw a cached title line with its top-left at `point` in the flipped
	344	/// view space — positioned to match what `NSString.draw(at:)` produced.
	345	private func drawTitle(_ s: String, at point: NSPoint) {
	346	guard let cg = NSGraphicsContext.current?.cgContext else { return }
	347	let (line, ascent) = Self.titleLine(s)
	348	cg.saveGState()
	349	// Flipped context: un-flip locally for glyph drawing. The box-top to
	350	// baseline offset is the line's ascent, matching NSString.draw(at:).
	351	cg.translateBy(x: point.x, y: point.y + ascent)
	352	cg.scaleBy(x: 1, y: -1)
	353	cg.textMatrix = .identity
	354	cg.textPosition = .zero
	355	CTLineDraw(line, cg)
	356	cg.restoreGState()
	357	}
	358
242	359	/// SF Symbols, tinted and baked into flat bitmaps, cached by `key`. Building
243	360	/// an SF Symbol and tinting it (`tinted` does a `lockFocus` composite) *per
244	361	/// draw* was the single biggest timeline draw cost: nearly every clip is
...	...	@@ -246,9 +363,12 @@ final class TimelineView: NSView {
246	363	/// the track-header buttons re-baked every frame too. Cached, drawing a badge
247	364	/// is a plain blit. Main-thread only (all drawing is).
248	365	private static var symbolCache: [String: NSImage] = [:]
	366	private static let symbolCacheLock = NSLock() // lanes rasterize in parallel
249	367	static func bakedSymbol(_ name: String, pointSize: CGFloat = 0,
250	368	weight: NSFont.Weight = .regular,
251	369	tint: NSColor, key: String) -> NSImage? {
	370	symbolCacheLock.lock()
	371	defer { symbolCacheLock.unlock() }
252	372	if let img = symbolCache[key] { return img }
253	373	var base = NSImage(systemSymbolName: name, accessibilityDescription: name)
254	374	if pointSize > 0 {
...	...	@@ -281,25 +401,28 @@ final class TimelineView: NSView {
281	401	bakedSymbol("link", tint: .white, key: "badge.link")
282	402	}
283	403
284		/// True while the user is actively scrolling/zooming (cleared ~120 ms after
285		/// the last scroll event, which triggers one full-detail redraw). On its own
286		/// it changes nothing — clips draw at full detail while scrolling. It only
287		/// gates the `lightScroll` fallback: a very dense frame (see
288		/// `denseScrollClips`) sheds the heavy filmstrip/waveform pass mid-scroll so
289		/// a pathological timeline can't stall, restoring detail the moment it settles.
290		private var isScrolling = false
291		private var scrollSettleToken = 0
292
293		/// Mark a scroll/zoom in progress and schedule the settle redraw.
294		private func noteScrolling() {
295		isScrolling = true
296		scrollSettleToken &+= 1
297		let token = scrollSettleToken
298		DispatchQueue.main.asyncAfter(deadline: .now() + 0.12) { [weak self] in
299		guard let self, self.scrollSettleToken == token else { return }
300		self.isScrolling = false
301		self.needsDisplay = true
	404	/// Index range of a lane's (start-sorted) clips that can intersect the
	405	/// time window — binary-searched so a frame's work is proportional to
	406	/// what's on screen, not to how far into a 10-hour project it sits. The
	407	/// lower bound backs off by the lane's longest clip (any clip starting
	408	/// earlier than that has necessarily ended before `left`); the upper bound
	409	/// is the first start past `right`. Callers still skip the odd short clip
	410	/// inside the backoff span with an `end < left` check.
	411	private func visibleIndexRange(_ clips: [Clip], lane: TrackRef,
	412	left: Double, right: Double) -> Range<Int> {
	413	let backoff = left - (maxClipDurByLane[lane] ?? 0)
	414	var lo = 0, hi = clips.count
	415	while lo < hi { // first index with start >= backoff
	416	let mid = (lo + hi) / 2
	417	if clips[mid].start < backoff { lo = mid + 1 } else { hi = mid }
	418	}
	419	let first = lo
	420	hi = clips.count
	421	while lo < hi { // first index with start > right
	422	let mid = (lo + hi) / 2
	423	if clips[mid].start <= right { lo = mid + 1 } else { hi = mid }
302	424	}
	425	return first..<lo
303	426	}
304	427
305	428	private func rebuildSceneIfNeeded() {
...	...	@@ -315,6 +438,13 @@ final class TimelineView: NSView {
315	438	// `overlaps()` (no arg) computes every lane in one pass; grouping by
316	439	// track yields the same per-lane arrays `overlaps(on:)` returned.
317	440	overlapsByLane = Dictionary(grouping: project.overlaps(), by: \.track)
	441	overlapIdsByLane = overlapsByLane.mapValues {
	442	Set($0.flatMap { [$0.a.id, $0.b.id] })
	443	}
	444	maxClipDurByLane = clipsByLane.mapValues {
	445	$0.map(\.duration).max() ?? 0
	446	}
	447	cachedTimelineDuration = project.timelineDuration
318	448	mediaById = Dictionary(project.media.map { ($0.id, $0) },
319	449	uniquingKeysWith: { a, _ in a })
320	450	// Per-lane colours: the track colour and its black-blended body/strip
...	...	@@ -322,7 +452,7 @@ final class TimelineView: NSView {
322	452	// alloc + two colour-space `blended()` conversions) for every clip every
323	453	// frame. Compute them once per lane here.
324	454	laneColorCache = [:]
325		for ref in project.laneRefs {
	455	for ref in laneRows {
326	456	let base = trackColor(ref)
327	457	laneColorCache[ref] = LaneColors(
328	458	base: base,
...	...	@@ -357,39 +487,308 @@ final class TimelineView: NSView {
357	487	let left = originSecond
358	488	let right = originSecond + Double(bounds.width - headerW) / pxPerSecond
359	489	var n = 0
360		for ref in project.laneRefs {
361		for c in clipsByLane[ref] ?? [] {
362		if c.start > right { break }
363		if c.end < left { continue }
	490	for ref in laneRows {
	491	let clips = clipsByLane[ref] ?? []
	492	for i in visibleIndexRange(clips, lane: ref, left: left, right: right)
	493	where clips[i].end >= left {
364	494	n += 1
365	495	}
366	496	}
367	497	return n
368	498	}
369	499
370		/// While actively scrolling a very dense frame, shed the heavy filmstrip/
371		/// waveform pass so the pan stays fluid; it returns the instant the scroll
372		/// settles. Ordinary-density views keep full detail — thumbnails, waveforms
373		/// and labels — even mid-scroll, so nothing visibly "drops out" in normal use.
374		private var lightScroll = false
375		private static let denseScrollClips = 350
	500	/// Below this on-screen width a clip physically cannot show its corner
	501	/// radius, title strip text, badges, or a meaningful filmstrip/waveform
	502	/// column — so `drawClip` takes a flat-rect fast path that produces the
	503	/// same pixels for a fraction of the cost. Detail is a function of what's
	504	/// resolvable at the current zoom, never of whether the user is scrolling:
	505	/// this replaces the old `lightScroll` mode, which shed thumbnails and
	506	/// labels mid-pan (visibly) yet saved almost nothing — the real per-clip
	507	/// cost was the path/clip-state chrome that ran for sub-pixel clips.
	508	private static let lodMinWidth: CGFloat = 3
	509
	510	// MARK: - Scene tile cache
	511	//
	512	// The scene (lane clips: bodies, filmstrips, waveforms, strips, labels,
	513	// badges, selection tint) is rasterized into per-lane, 512-pt-wide tiles in
	514	// TIMELINE space — a tile's x axis is (t − sliceStart)·pxPerSecond, which
	515	// is independent of the pan origin. Panning and the 60 Hz playhead redraw
	516	// therefore cost a handful of blits plus the (cheap) chrome, instead of
	517	// re-rendering thousands of clips. Anything that changes scene pixels —
	518	// model edits, selection, thumbnails landing, theme, zoom, lane heights —
	519	// flushes; tiles rebuild lazily, visible-first, at direct-render cost.
	520	// Active edit gestures bypass tiles entirely (direct draw), so a drag never
	521	// thrashes the cache mid-gesture.
	522
	523	private struct TileKey: Hashable {
	524	let ref: TrackRef
	525	let slice: Int
	526	}
	527	/// Everything a tile's pixels depend on besides the model/selection (those
	528	/// flush via notifications). A mismatch flushes the whole cache.
	529	private struct TileParams: Equatable {
	530	var pps: Double
	531	var scale: CGFloat
	532	var light: Bool
	533	var heights: [TrackRef: CGFloat]
	534	var showFilmstrips: Bool
	535	}
	536	private var tiles: [TileKey: CGImage] = [:]
	537	private var tileUse: [TileKey: Int] = [:]
	538	private var tileTick = 0
	539	private var tileParams: TileParams?
	540	private static let tileW: CGFloat = 512
	541	/// ~96 tiles ≈ a few viewports of 2× lane strips (~100 MB worst case).
	542	private static let maxTiles = 96
	543	/// Cap on tile rasterizations per frame. A cold viewport (fresh zoom, big
	544	/// jump) draws the un-cached slices directly this frame — same pixels,
	545	/// direct cost — and fills the cache over the next few frames instead of
	546	/// paying ~25 bitmap allocations in one frame.
	547	private static let tileRendersPerFrame = 6
	548	private var tileRenderBudget = 0
	549	private var tileFillPending = false
	550	private var lastDrawOrigin = 0.0
	551	private var lastDrawPps = 0.0
	552	/// Escape hatch for A/B measurement and debugging: SEQ_NOTILES=1 forces
	553	/// the direct (Stage-1) render path. Mutable so --perftest can A/B both
	554	/// paths inside one process (immune to thermal drift between runs).
	555	static var tilesDisabled =
	556	ProcessInfo.processInfo.environment["SEQ_NOTILES"] == "1"
	557
	558	private func flushTiles() {
	559	tiles.removeAll(keepingCapacity: true)
	560	tileUse.removeAll(keepingCapacity: true)
	561	}
	562
	563	/// Device-pixel scale of the surface actually being drawn into, captured
	564	/// from the context CTM at the top of `draw`. Falling back to the window's
	565	/// backing scale is only right when they agree — an offscreen 1× target
	566	/// (like --perftest's bitmap) on a 2× machine would otherwise get 2× tiles
	567	/// downsampled on every blit.
	568	private var renderScale: CGFloat = 2
	569
	570	private var backingScale: CGFloat {
	571	window?.backingScaleFactor ?? NSScreen.main?.backingScaleFactor ?? 2
	572	}
	573
	574	/// Quantize a length/offset to the device-pixel grid. Tiles are blitted at
	575	/// integral device pixels; quantizing the shared geometry (origin, scroll,
	576	/// lane heights) keeps the tile and direct paths on the same sub-pixel
	577	/// phase, so their output is pixel-identical and blits never resample.
	578	private func quantized(_ v: CGFloat) -> CGFloat {
	579	(v * renderScale).rounded() / renderScale
	580	}
	581
	582	private func evictTilesIfNeeded() {
	583	guard tiles.count > Self.maxTiles else { return }
	584	for (key, _) in tileUse.sorted(by: { $0.value < $1.value })
	585	.prefix(tiles.count - Self.maxTiles) {
	586	tiles[key] = nil
	587	tileUse[key] = nil
	588	}
	589	}
	590
	591	/// Blit the lane's visible tiles. Missing tiles are rendered up to the
	592	/// per-frame budget; past it, their span draws directly (identical pixels)
	593	/// and a follow-up display pass finishes filling the cache.
	594	private func blitLaneTiles(ref: TrackRef, lane: NSRect) {
	595	guard let cg = NSGraphicsContext.current?.cgContext else { return }
	596	let sliceDur = Double(Self.tileW) / pxPerSecond
	597	let leftSec = secondsFor(headerW)
	598	let rightSec = secondsFor(bounds.width)
	599	var slice = Int(floor(leftSec / sliceDur))
	600	let last = Int(floor(rightSec / sliceDur))
	601	while slice <= last {
	602	let x = xFor(Double(slice) * sliceDur)
	603	if let img = tileImage(ref: ref, lane: lane, slice: slice, sliceDur: sliceDur) {
	604	// CGContext blit (NSImage.draw pays rep-matching/colorspace
	605	// overhead per call). Local flip: CGImages draw bottom-up.
	606	cg.saveGState()
	607	cg.translateBy(x: x, y: lane.maxY)
	608	cg.scaleBy(x: 1, y: -1)
	609	cg.draw(img, in: CGRect(x: 0, y: 0, width: Self.tileW,
	610	height: lane.height))
	611	cg.restoreGState()
	612	if DrawProf.on { DrawProf.tileBlits += 1 }
	613	} else {
	614	// Over budget this frame: draw the slice's span directly.
	615	NSGraphicsContext.current?.saveGraphicsState()
	616	NSRect(x: x, y: lane.minY, width: Self.tileW,
	617	height: lane.height).clip()
	618	drawLaneClips(ref: ref, lane: lane, cullX0: x, cullX1: x + Self.tileW)
	619	NSGraphicsContext.current?.restoreGraphicsState()
	620	scheduleTileFill()
	621	}
	622	slice += 1
	623	}
	624	}
	625
	626	/// One coalesced follow-up display pass to keep rasterizing missed tiles
	627	/// after a budget-limited frame.
	628	private func scheduleTileFill() {
	629	guard !tileFillPending else { return }
	630	tileFillPending = true
	631	DispatchQueue.main.async { [weak self] in
	632	guard let self else { return }
	633	self.tileFillPending = false
	634	self.needsDisplay = true
	635	}
	636	}
	637
	638	/// The cached tile for (lane, slice), rendering it via the SAME
	639	/// `drawLaneClips` code the direct path uses — pixel-equivalent by
	640	/// construction. The context is translated so the slice's start lands at
	641	/// x = 0 and the lane's top at y = 0; both offsets cancel the pan origin,
	642	/// which is what makes the raster reusable across scroll positions.
	643	private func tileImage(ref: TrackRef, lane: NSRect, slice: Int,
	644	sliceDur: Double) -> CGImage? {
	645	let key = TileKey(ref: ref, slice: slice)
	646	tileTick += 1
	647	tileUse[key] = tileTick
	648	if let img = tiles[key] { return img }
	649	guard tileRenderBudget > 0 else { return nil }
	650	tileRenderBudget -= 1
	651
	652	let scale = renderScale
	653	let pxW = Int((Self.tileW * scale).rounded())
	654	let pxH = Int((lane.height * scale).rounded())
	655	// Native Quartz raster format (BGRA premultiplied, little-endian) in
	656	// the window's own colorspace: blits are then straight memory copies.
	657	// An NSBitmapImageRep here (RGBA, deviceRGB) costs a per-blit swizzle
	658	// + colorspace conversion — ~1.5 ms per tile, wiping out the caching.
	659	let space = window?.colorSpace?.cgColorSpace
	660	?? CGColorSpace(name: CGColorSpace.sRGB)!
	661	guard pxW > 0, pxH > 0,
	662	let cg = CGContext(
	663	data: nil, width: pxW, height: pxH, bitsPerComponent: 8,
	664	bytesPerRow: 0, space: space,
	665	bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue
	666	\| CGBitmapInfo.byteOrder32Little.rawValue) else { return nil }
	667
	668	NSGraphicsContext.saveGraphicsState()
	669	// Map: device pixels → points, unflipped → flipped (the view draws
	670	// top-down), view space → tile space. Wrapped in a `flipped: true`
	671	// NSGraphicsContext so text and images orient correctly.
	672	cg.scaleBy(x: scale, y: scale)
	673	cg.translateBy(x: 0, y: lane.height)
	674	cg.scaleBy(x: 1, y: -1)
	675	let x0 = xFor(Double(slice) * sliceDur)
	676	cg.translateBy(x: -x0, y: -lane.minY)
	677	NSGraphicsContext.current = NSGraphicsContext(cgContext: cg, flipped: true)
	678	drawLaneClips(ref: ref, lane: lane, cullX0: x0, cullX1: x0 + Self.tileW)
	679	NSGraphicsContext.restoreGraphicsState()
	680
	681	guard let img = cg.makeImage() else { return nil }
	682	tiles[key] = img
	683	evictTilesIfNeeded()
	684	if DrawProf.on { DrawProf.tileRenders += 1 }
	685	return img
	686	}
	687
	688	/// Live draw-time telemetry, on when the app is launched with
	689	/// SEQ_DRAWPROF=1 in the environment (run the binary directly with stderr
	690	/// to a file — NSLog is invisible under `open`). Prints one line per
	691	/// second: draws that second and mean/max ms per draw. Purely additive so
	692	/// GUI perf work can be judged against real numbers, like --perftest.
	693	private static let liveProf = ProcessInfo.processInfo.environment["SEQ_DRAWPROF"] == "1"
	694	private var profWindowStart = CACurrentMediaTime()
	695	private var profFrames = 0
	696	private var profTotalMs = 0.0
	697	private var profMaxMs = 0.0
376	698
377	699	override func draw(_ dirtyRect: NSRect) {
	700	let profT0 = Self.liveProf ? CACurrentMediaTime() : 0
	701	defer {
	702	if Self.liveProf {
	703	let ms = (CACurrentMediaTime() - profT0) * 1000
	704	profFrames += 1
	705	profTotalMs += ms
	706	profMaxMs = max(profMaxMs, ms)
	707	let now = CACurrentMediaTime()
	708	if now - profWindowStart >= 1.0 {
	709	FileHandle.standardError.write(Data(String(format:
	710	"[drawprof] %d draws, avg %.2f ms, max %.2f ms\n",
	711	profFrames, profTotalMs / Double(profFrames),
	712	profMaxMs).utf8))
	713	profWindowStart = now
	714	profFrames = 0
	715	profTotalMs = 0
	716	profMaxMs = 0
	717	}
	718	}
	719	}
378	720	Theme.timelineBg.setFill()
379	721	bounds.fill()
380	722
	723	// Publish the on-screen time span — a heat anchor for the proxy
	724	// builder (the user scrubs inside what they can see). Cheap enough
	725	// to set every frame; read lazily by the chunk scheduler.
	726	let visibleSpan = Double(bounds.width - headerW) / pxPerSecond
	727	ctx.session.visibleTimeRange = originSecond...(originSecond + max(1, visibleSpan))
	728
381	729	DrawProf.t("scene") { rebuildSceneIfNeeded() }
382		lightScroll = isScrolling && visibleClipCount() > Self.denseScrollClips
383		scrollY = min(scrollY, maxScrollY)
384		let rows = project.laneRefs
	730	DrawProf.t("cull") {
	731	// Match the tile raster scale to the surface being drawn into.
	732	if let ctm = NSGraphicsContext.current?.cgContext
	733	.userSpaceToDeviceSpaceTransform {
	734	let s = abs(ctm.a)
	735	if s > 0.1, s != renderScale {
	736	renderScale = s
	737	flushTiles()
	738	}
	739	}
	740	scrollY = quantized(min(scrollY, maxScrollY))
	741	// Snap the pan origin to the device-pixel grid (≤ half a device
	742	// pixel, imperceptible) so tile blits land on integral pixels and
	743	// the tile and direct paths share one sub-pixel phase.
	744	let q = pxPerSecond * Double(renderScale)
	745	originSecond = (originSecond * q).rounded() / q
	746	}
	747	// Route the frame: warm frames (rest, pan, playback) blit the tile
	748	// cache; cold frames — a zoom in flight (every tile invalid), a
	749	// teleport jump (a whole viewport of new slices), or a live edit
	750	// gesture (model changes per event) — rasterize all lanes in parallel
	751	// instead, and the cache refills once things settle.
	752	let editing = store.gestureBaseModel != nil \|\| drag.mode == .box
	753	let jumped = abs(originSecond - lastDrawOrigin) * pxPerSecond
	754	> Double(Self.tileW)
	755	let zoomed = pxPerSecond != lastDrawPps
	756	lastDrawOrigin = originSecond
	757	lastDrawPps = pxPerSecond
	758	let tiled = !Self.tilesDisabled && !editing && !zoomed && !jumped
	759	tileRenderBudget = Self.tileRendersPerFrame
	760	if tiled {
	761	let params = TileParams(
	762	pps: pxPerSecond, scale: renderScale, light: Theme.light,
	763	heights: Dictionary(uniqueKeysWithValues:
	764	laneRows.map { ($0, laneHeight($0)) }),
	765	showFilmstrips: session.showFilmstrips)
	766	if params != tileParams {
	767	flushTiles()
	768	tileParams = params
	769	}
	770	} else if zoomed \|\| jumped {
	771	// The gesture invalidated the cache; warm it back up as soon as
	772	// the stream of cold frames stops.
	773	flushTiles()
	774	tileParams = nil
	775	scheduleTileFill()
	776	}
	777	let rows = laneRows
385	778	DrawProf.t("lanes") {
386		for row in 0..<rows.count {
387		drawLane(row: row, ref: rows[row])
	779	if tiled {
	780	for row in 0..<rows.count {
	781	drawLane(row: row, ref: rows[row], tiled: true)
	782	}
	783	} else {
	784	drawLanesDirectParallel(rows: rows)
388	785	}
389	786	}
390		drawDragHintLanes()
391		drawFileDropPreview()
392		drawFusionBand()
	787	DrawProf.t("hints") {
	788	drawDragHintLanes()
	789	drawFileDropPreview()
	790	}
	791	DrawProf.t("fusion") { drawFusionBand() }
393	792	// Opaque header column so clips never show behind the buttons.
394	793	Theme.timelineBg.setFill()
395	794	NSRect(x: 0, y: rulerH, width: headerW, height: bounds.height - rulerH).fill()
...	...	@@ -399,13 +798,16 @@ final class TimelineView: NSView {
399	798	drawTrackHeader(row: row, ref: rows[row], lane: laneRect(row: row))
400	799	}
401	800	}
402		drawRuler()
403		drawInOut()
404		drawMarkers()
405		drawSnapIndicator()
406		drawBoxSelect()
407		drawPlayhead()
408		drawScrollbars()
	801	DrawProf.t("ruler") { drawRuler() }
	802	DrawProf.t("strip") { drawOptimizeStrip() }
	803	DrawProf.t("overlays") {
	804	drawInOut()
	805	drawMarkers()
	806	drawSnapIndicator()
	807	drawBoxSelect()
	808	drawPlayhead()
	809	}
	810	DrawProf.t("scrollbars") { drawScrollbars() }
409	811	}
410	812
411	813	// MARK: - Scroll/zoom bars
...	...	@@ -427,7 +829,8 @@ final class TimelineView: NSView {
427	829	private func hDomain() -> (lo: Double, hi: Double) {
428	830	let viewSec = Double(bounds.width - headerW) / pxPerSecond
429	831	let lo = min(0, originSecond)
430		let hi = max(project.timelineDuration + 10, originSecond + viewSec)
	832	rebuildSceneIfNeeded()
	833	let hi = max(cachedTimelineDuration + 10, originSecond + viewSec)
431	834	return (lo, hi)
432	835	}
433	836
...	...	@@ -491,33 +894,30 @@ final class TimelineView: NSView {
491	894	return nil
492	895	}
493	896
494		private func drawLane(row: Int, ref: TrackRef) {
	897	private func drawLane(row: Int, ref: TrackRef, tiled: Bool) {
495	898	let lane = laneRect(row: row)
496	899	guard lane.minY < bounds.maxY, lane.maxY > lanesTop else { return }
497	900	(ref == .storyboard ? Theme.storyboardLaneBg : Theme.laneBg).setFill()
498	901	NSBezierPath(roundedRect: lane, xRadius: 4, yRadius: 4).fill()
499	902
500		let overlaps = overlapsByLane[ref] ?? []
501		let overlappingIds = Set(overlaps.flatMap { [$0.a.id, $0.b.id] })
502
503		// Horizontal culling: clips are sorted by start, so once one starts past
504		// the right edge every later clip does too — stop. Clips ending before
505		// the left edge are skipped. Keeps the loop proportional to what's
506		// on-screen, not to the whole (possibly huge) lane.
507		let leftSec = originSecond
508		let rightSec = originSecond + Double(bounds.width - headerW) / pxPerSecond
509		let colors = laneColors(ref)
510		for clip in clipsByLane[ref] ?? [] {
511		if clip.start > rightSec { break }
512		if clip.end < leftSec { continue }
513		drawClip(clip, row: row, ref: ref, colors: colors,
514		overlapping: overlappingIds.contains(clip.id))
	903	if tiled {
	904	blitLaneTiles(ref: ref, lane: lane)
	905	} else {
	906	drawLaneClips(ref: ref, lane: lane,
	907	cullX0: headerW, cullX1: bounds.width)
515	908	}
	909	drawLaneDecorations(ref: ref, lane: lane)
	910	}
	911
	912	/// Pinned labels + overlap bands — main-thread, over blits or direct clips.
	913	private func drawLaneDecorations(ref: TrackRef, lane: NSRect) {
	914	drawPinnedLabels(ref: ref, lane: lane)
516	915
517	916	// Bright red overlap ranges on top of the clip bodies.
518		for o in overlaps {
	917	for o in overlapsByLane[ref] ?? [] {
519	918	let r = NSRect(x: xFor(o.start), y: lane.minY + 1,
520	919	width: max(2, xFor(o.end) - xFor(o.start)), height: lane.height - 2)
	920	guard r.maxX > headerW, r.minX < bounds.width else { continue }
521	921	NSColor.systemRed.withAlphaComponent(0.40).setFill()
522	922	r.fill()
523	923	NSColor.systemRed.setStroke()
...	...	@@ -527,6 +927,123 @@ final class TimelineView: NSView {
527	927	}
528	928	}
529	929
	930	// MARK: - Parallel direct rendering (cold frames)
	931
	932	/// Persistent per-lane raster buffers for cold frames; recreated on size/
	933	/// scale change. ~7 MB per lane at 2× on a wide window — the price of
	934	/// rasterizing a zoom gesture on every core instead of one.
	935	private var laneBufs: [TrackRef: CGContext] = [:]
	936
	937	/// A cold frame (zoom in flight, teleport jump, live edit gesture) must
	938	/// re-render every visible lane from scratch — but lanes are independent,
	939	/// so rasterize them CONCURRENTLY into per-lane buffers with the exact
	940	/// same `drawLaneClips` code and composite on main. Same rasterizer, same
	941	/// pixels; wall-clock is the slowest lane, not the sum. The storyboard
	942	/// lane draws serially on main (BoardStore's raster cache isn't locked).
	943	private func drawLanesDirectParallel(rows: [TrackRef]) {
	944	var work: [(ref: TrackRef, lane: NSRect)] = []
	945	for (row, ref) in rows.enumerated() {
	946	let lane = laneRect(row: row)
	947	guard lane.minY < bounds.maxY, lane.maxY > lanesTop else { continue }
	948	(ref == .storyboard ? Theme.storyboardLaneBg : Theme.laneBg).setFill()
	949	NSBezierPath(roundedRect: lane, xRadius: 4, yRadius: 4).fill()
	950	work.append((ref, lane))
	951	}
	952	guard !work.isEmpty, let mainCG = NSGraphicsContext.current?.cgContext
	953	else { return }
	954
	955	let scale = renderScale
	956	let pxW = Int((bounds.width * scale).rounded())
	957	let space = window?.colorSpace?.cgColorSpace
	958	?? CGColorSpace(name: CGColorSpace.sRGB)!
	959	let ctxs: [CGContext?] = work.map { item in
	960	if item.ref == .storyboard { return nil }
	961	let pxH = Int((item.lane.height * scale).rounded())
	962	if let c = laneBufs[item.ref], c.width == pxW, c.height == pxH {
	963	return c
	964	}
	965	let c = CGContext(
	966	data: nil, width: pxW, height: pxH, bitsPerComponent: 8,
	967	bytesPerRow: 0, space: space,
	968	bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue
	969	\| CGBitmapInfo.byteOrder32Little.rawValue)
	970	laneBufs[item.ref] = c
	971	return c
	972	}
	973
	974	DispatchQueue.concurrentPerform(iterations: work.count) { i in
	975	guard let cg = ctxs[i] else { return } // storyboard → main below
	976	let (ref, lane) = work[i]
	977	autoreleasepool {
	978	cg.clear(CGRect(x: 0, y: 0, width: CGFloat(cg.width),
	979	height: CGFloat(cg.height)))
	980	cg.saveGState()
	981	cg.scaleBy(x: scale, y: scale)
	982	cg.translateBy(x: 0, y: lane.height)
	983	cg.scaleBy(x: 1, y: -1)
	984	cg.translateBy(x: 0, y: -lane.minY)
	985	// NSGraphicsContext.current is thread-local — but
	986	// concurrentPerform runs one of these iterations ON the
	987	// calling (main) thread, so the view's own context must be
	988	// restored, not nilled.
	989	let prev = NSGraphicsContext.current
	990	NSGraphicsContext.current = NSGraphicsContext(cgContext: cg, flipped: true)
	991	drawLaneClips(ref: ref, lane: lane,
	992	cullX0: headerW, cullX1: bounds.width)
	993	NSGraphicsContext.current = prev
	994	cg.restoreGState()
	995	}
	996	}
	997
	998	for (i, item) in work.enumerated() {
	999	if let cg = ctxs[i] {
	1000	if let img = cg.makeImage() {
	1001	mainCG.saveGState()
	1002	mainCG.translateBy(x: 0, y: item.lane.maxY)
	1003	mainCG.scaleBy(x: 1, y: -1)
	1004	mainCG.draw(img, in: CGRect(x: 0, y: 0, width: bounds.width,
	1005	height: item.lane.height))
	1006	mainCG.restoreGState()
	1007	}
	1008	} else {
	1009	drawLaneClips(ref: item.ref, lane: item.lane,
	1010	cullX0: headerW, cullX1: bounds.width)
	1011	}
	1012	drawLaneDecorations(ref: item.ref, lane: item.lane)
	1013	}
	1014	}
	1015
	1016	/// One lane's clips into the current context, culled and clamped to the
	1017	/// window [cullX0, cullX1] (view coordinates). The window is the view for
	1018	/// direct drawing and the tile's span (± bleed) when rendering a tile —
	1019	/// the drawing itself is identical, so the two paths are pixel-equivalent.
	1020	private func drawLaneClips(ref: TrackRef, lane: NSRect,
	1021	cullX0: CGFloat, cullX1: CGFloat) {
	1022	let overlappingIds = overlapIdsByLane[ref] ?? []
	1023	// Bleed: fade handles / shot dividers / borders paint a few points
	1024	// past a clip's rect, so a clip just outside the window still owns
	1025	// pixels inside it.
	1026	let bleed: CGFloat = 8
	1027	let leftSec = secondsFor(cullX0 - bleed)
	1028	let rightSec = secondsFor(cullX1 + bleed)
	1029	let colors = laneColors(ref)
	1030	let clips = clipsByLane[ref] ?? []
	1031	// A storyboard panel's left divider depends on whether an earlier panel
	1032	// exists on the lane; the array is start-sorted, so any predecessor
	1033	// with a strictly smaller start means "has previous".
	1034	let range = visibleIndexRange(clips, lane: ref, left: leftSec, right: rightSec)
	1035	for i in range {
	1036	let clip = clips[i]
	1037	if clip.end < leftSec { continue }
	1038	let hasPrevPanel = ref == .storyboard && i > 0
	1039	&& clips[0].start < clip.start - 1e-6
	1040	drawClip(clip, lane: lane, ref: ref, colors: colors,
	1041	overlapping: overlappingIds.contains(clip.id),
	1042	hasPrevPanel: hasPrevPanel,
	1043	cullX0: cullX0 - bleed, cullX1: cullX1 + bleed)
	1044	}
	1045	}
	1046
530	1047	/// Circular SF-Symbol button in the header column (hide preview / focus).
531	1048	private func drawHeaderButton(_ symbolName: String, centerY: CGFloat, on: Bool) {
532	1049	drawHeaderButton(symbolName, in: NSRect(x: headerW / 2 - 8.5, y: centerY - 8.5,
...	...	@@ -637,7 +1154,7 @@ final class TimelineView: NSView {
637	1154
638	1155	private func drawFusionHeader() {
639	1156	guard fusionBandH > 0 else { return }
640		let band = NSRect(x: 0, y: rulerH, width: headerW, height: fusionBandH)
	1157	let band = NSRect(x: 0, y: fusionTop, width: headerW, height: fusionBandH)
641	1158	FusionComps.yellow.withAlphaComponent(session.fusionHidden ? 0.25 : 0.6).setFill()
642	1159	NSBezierPath(roundedRect: band.insetBy(dx: 2, dy: 2), xRadius: 3, yRadius: 3).fill()
643	1160	let attrs: [NSAttributedString.Key: Any] = [
...	...	@@ -656,7 +1173,7 @@ final class TimelineView: NSView {
656	1173	// become tracks. No resident placeholder lane. (Dropped FILES get their
657	1174	// own landing preview in drawFileDropPreview.)
658	1175	var rows: [Int] = []
659		let count = project.laneRefs.count
	1176	let count = laneRows.count
660	1177	if drag.mode == .move, let row = dragHintRow, row >= count {
661	1178	rows = Array(count...row)
662	1179	}
...	...	@@ -672,46 +1189,113 @@ final class TimelineView: NSView {
672	1189	}
673	1190	}
674	1191
675		private func drawClip(_ clip: Clip, row: Int, ref: TrackRef, colors: LaneColors,
676		overlapping: Bool) {
677		let rect = clipRect(clip, row: row)
678		guard rect.maxX > headerW, rect.minX < bounds.width else { return }
	1192	private func drawClip(_ clip: Clip, lane: NSRect, ref: TrackRef, colors: LaneColors,
	1193	overlapping: Bool, hasPrevPanel: Bool,
	1194	cullX0: CGFloat, cullX1: CGFloat) {
	1195	let x0 = xFor(clip.start), x1 = xFor(clip.end)
	1196	let rect = NSRect(x: x0, y: lane.minY, width: max(2, x1 - x0), height: lane.height)
	1197	guard rect.maxX > cullX0, rect.minX < cullX1 else { return }
679	1198	let media = clip.mediaId.flatMap { mediaById[$0] }
680	1199	let color = colors.base
681	1200	let selected = store.selection.contains(clip.id)
	1201	let linkedSel = !selected && linkedSelectionCache.contains(clip.id)
682	1202
683	1203	// Storyboard panels tile edge-to-edge (they're gapless) so the track
684	1204	// reads as one continuous filmstrip — square corners, no per-panel
685	1205	// card, dividers drawn between shots below.
686	1206	let storyboard = clip.kind == .storyboard
	1207
	1208	func bodyFillColor() -> NSColor {
	1209	switch clip.kind {
	1210	case .storyboard: NSColor(calibratedWhite: 0.88, alpha: 1)
	1211	case .audio: colors.audioBody
	1212	case .video: media == nil ? NSColor(calibratedWhite: 0.25, alpha: 1)
	1213	: colors.videoBody
	1214	}
	1215	}
	1216
	1217	// ---- Fast path: a clip too narrow to resolve any detail. ----
	1218	// Below `lodMinWidth` the rounded corners, strip text, badges and
	1219	// filmstrip/waveform columns are physically invisible, so flat rect
	1220	// fills produce the same picture without the bezier/clip-state chrome
	1221	// that made dense zooms cost hundreds of ms. Everything that still
	1222	// reads at this size is kept: body + strip colors, the audio center
	1223	// line and fade handles (the texture of dense audio lanes), status
	1224	// tint/borders, storyboard dividers.
	1225	if rect.width < Self.lodMinWidth {
	1226	bodyFillColor().setFill()
	1227	rect.fill()
	1228	colors.strip.setFill()
	1229	NSRect(x: rect.minX, y: rect.minY, width: rect.width, height: 13).fill()
	1230	if clip.kind == .audio {
	1231	color.withAlphaComponent(0.35).setFill()
	1232	NSRect(x: rect.minX, y: rect.midY + 6, width: rect.width, height: 1).fill()
	1233	// Fade-handle slivers: the full path clips the 7 px handle
	1234	// ovals to the clip body, so at this width only a couple of
	1235	// white columns survive — the speckle texture of a dense audio
	1236	// lane. Fill the same intersection directly.
	1237	(selected ? NSColor.white : NSColor(calibratedWhite: 0.85, alpha: 0.9)).setFill()
	1238	let hy = rect.minY + 13.5
	1239	for x in [xFor(clip.start + clip.fadeIn), xFor(clip.end - clip.fadeOut)] {
	1240	let sliver = NSRect(x: x - 3.5, y: hy, width: 7, height: 7)
	1241	.intersection(rect)
	1242	if !sliver.isEmpty { sliver.fill() }
	1243	}
	1244	}
	1245	// Status tint only: at this width the border stroke's inset path is
	1246	// degenerate (sub-zero width) and renders nothing today, and the
	1247	// red overlap band is painted at lane level. The tint is what reads.
	1248	if selected \|\| linkedSel {
	1249	(selected ? NSColor.controlAccentColor : NSColor.systemCyan)
	1250	.withAlphaComponent(selected ? 0.34 : 0.20).setFill()
	1251	rect.fill()
	1252	}
	1253	if storyboard { drawShotDivider(clip, rect: rect, hasPrev: hasPrevPanel) }
	1254	return
	1255	}
	1256
	1257	// A zoomed-in clip's rect can be literally millions of points wide;
	1258	// building paths and image draws at that size costs real time even
	1259	// though almost all of it is clipped away. Clamp the card geometry to
	1260	// the view plus a margin that keeps the rounded corners and border
	1261	// strokes of the clamped edges safely offscreen — the pixels inside
	1262	// the view are identical. (The filmstrip keeps the TRUE rect: its
	1263	// thumbnail tiling is phase-anchored to the clip's real left edge, and
	1264	// it already culls to the visible span internally.)
	1265	let clampMargin: CGFloat = 12
	1266	let cardRect: NSRect = {
	1267	let cx0 = max(rect.minX, cullX0 - clampMargin)
	1268	let cx1 = min(rect.maxX, cullX1 + clampMargin)
	1269	return NSRect(x: cx0, y: rect.minY, width: cx1 - cx0, height: rect.height)
	1270	}()
	1271
687	1272	let bodyRect = storyboard
688		? NSRect(x: rect.minX, y: rect.minY + 0.5, width: rect.width, height: rect.height - 1)
689		: rect.insetBy(dx: 0.5, dy: 0.5)
	1273	? NSRect(x: cardRect.minX, y: cardRect.minY + 0.5,
	1274	width: cardRect.width, height: cardRect.height - 1)
	1275	: cardRect.insetBy(dx: 0.5, dy: 0.5)
690	1276	let bodyRadius: CGFloat = storyboard ? 0 : 3
691		let body = NSBezierPath(roundedRect: bodyRect, xRadius: bodyRadius, yRadius: bodyRadius)
692		switch clip.kind {
693		case .storyboard:
694		NSColor(calibratedWhite: 0.88, alpha: 1).setFill()
695		case .audio:
696		colors.audioBody.setFill()
697		case .video:
698		(media == nil ? NSColor(calibratedWhite: 0.25, alpha: 1) : colors.videoBody).setFill()
699		}
700		body.fill()
701
702		// Full detail (thumbnails, waveforms, labels) normally — including while
703		// scrolling. Only a very dense frame mid-scroll drops to bodies + strip +
704		// border (see `lightScroll`), and only until the pan settles.
705		let detail = !lightScroll
706
707		if detail {
	1277	let body = DrawProf.t("clip.body") {
	1278	let p = NSBezierPath(roundedRect: bodyRect, xRadius: bodyRadius,
	1279	yRadius: bodyRadius)
	1280	bodyFillColor().setFill()
	1281	p.fill()
	1282	return p
	1283	}
	1284
	1285	DrawProf.t("clip.content") {
708	1286	NSGraphicsContext.current?.saveGraphicsState()
709	1287	body.addClip()
710	1288	switch clip.kind {
711	1289	case .video:
712		if let media, session.showFilmstrips { drawFilmstrip(clip, media: media, rect: rect) }
	1290	if let media, session.showFilmstrips {
	1291	drawFilmstrip(clip, media: media, rect: rect,
	1292	cullX0: cullX0, cullX1: cullX1)
	1293	}
713	1294	case .audio:
714		if let media { drawWaveform(clip, media: media, rect: rect, color: color) }
	1295	if let media {
	1296	drawWaveform(clip, media: media, rect: rect, color: color,
	1297	cullX0: cullX0, cullX1: cullX1)
	1298	}
715	1299	drawFades(clip, rect: rect, selected: selected)
716	1300	case .storyboard:
717	1301	drawBoardThumb(clip, rect: rect)
...	...	@@ -719,23 +1303,22 @@ final class TimelineView: NSView {
719	1303	NSGraphicsContext.current?.restoreGraphicsState()
720	1304	}
721	1305
722		let linkedSel = !selected && linkedSelectionCache.contains(clip.id)
723
724	1306	// Title strip
725		var title = media?.displayName
726		?? (clip.kind == .storyboard
727		? (panelNamesCache[clip.id] ?? "Panel") : "missing media")
728		if clip.kind != .storyboard && media == nil { title = "⚠︎ " + title }
729		if clip.kind == .audio { title = "♪ " + title }
730		// The label is drawn only at rest and only when the clip is wide enough
731		// to read; a clip narrower than this shows no legible text anyway.
732		let showLabel = detail && rect.width >= 22
733		if detail { NSGraphicsContext.current?.saveGraphicsState(); body.addClip() }
	1307	let title = clipTitle(clip, media: media)
	1308	// The label is drawn only when the clip is wide enough to read; a clip
	1309	// narrower than this shows no legible text anyway.
	1310	let showLabel = rect.width >= 22
	1311	DrawProf.t("clip.strip") {
	1312	NSGraphicsContext.current?.saveGraphicsState()
	1313	body.addClip()
734	1314	colors.strip.setFill()
735		NSRect(x: rect.minX, y: rect.minY, width: rect.width, height: 13).fill()
	1315	NSRect(x: cardRect.minX, y: cardRect.minY, width: cardRect.width, height: 13).fill()
736	1316	if showLabel {
737		title.draw(at: NSPoint(x: max(rect.minX, headerW) + 5, y: rect.minY + 1),
738		withAttributes: Self.titleAttrs)
	1317	// Unpinned: the label sits at the clip's true left edge. A clip
	1318	// scrolled off the left edge gets its label re-pinned to the view
	1319	// edge by `drawPinnedLabels` — an overlay pass, so the pinning
	1320	// never gets baked into a cached tile.
	1321	drawTitle(title, at: NSPoint(x: rect.minX + 5, y: rect.minY + 1))
739	1322
740	1323	var badgeX = rect.maxX - 16
741	1324	if clip.speed != 1 {
...	...	@@ -759,16 +1342,19 @@ final class TimelineView: NSView {
759	1342	from: .zero, operation: .sourceOver, fraction: 0.7)
760	1343	}
761	1344	}
762		if detail { NSGraphicsContext.current?.restoreGraphicsState() }
	1345	NSGraphicsContext.current?.restoreGraphicsState()
	1346	}
763	1347
	1348	DrawProf.t("clip.chrome") {
764	1349	// Selection reads as a full-card tint, not just an outline. Link-mates
765	1350	// of the selection (they act selected) tint aqua.
766	1351	if selected \|\| linkedSel {
767		if detail { NSGraphicsContext.current?.saveGraphicsState(); body.addClip() }
	1352	NSGraphicsContext.current?.saveGraphicsState()
	1353	body.addClip()
768	1354	(selected ? NSColor.controlAccentColor : NSColor.systemCyan)
769	1355	.withAlphaComponent(selected ? 0.34 : 0.20).setFill()
770		(detail ? rect : bodyRect).fill()
771		if detail { NSGraphicsContext.current?.restoreGraphicsState() }
	1356	cardRect.fill()
	1357	NSGraphicsContext.current?.restoreGraphicsState()
772	1358	}
773	1359
774	1360	// Border LAST, on top of the tint: overlap = red, selection = accent
...	...	@@ -777,7 +1363,7 @@ final class TimelineView: NSView {
777	1363	// outline (selected / linked / overlapping).
778	1364	if !storyboard \|\| selected \|\| linkedSel \|\| overlapping {
779	1365	let radius: CGFloat = storyboard ? 0 : 3
780		let border = NSBezierPath(roundedRect: rect.insetBy(dx: 1.25, dy: 1.25),
	1366	let border = NSBezierPath(roundedRect: cardRect.insetBy(dx: 1.25, dy: 1.25),
781	1367	xRadius: radius, yRadius: radius)
782	1368	border.lineWidth = selected ? 3.5 : linkedSel ? 3 : (overlapping ? 2 : 1.5)
783	1369	(selected ? Theme.selection
...	...	@@ -786,42 +1372,141 @@ final class TimelineView: NSView {
786	1372	border.stroke()
787	1373	}
788	1374
789		// Shot divider: an opaque line sitting ON the boundary between two
790		// storyboard panels (they tile gaplessly). A new shot gets a bold
791		// orange bar; frames within a shot get a thin neutral line. The first
792		// panel of the track has no divider on its left.
793		if storyboard {
794		let hasPrev = project.clips.contains {
795		$0.id != clip.id && $0.kind == .storyboard
796		&& $0.track == clip.track && $0.start < clip.start - 1e-6
	1375	if storyboard { drawShotDivider(clip, rect: rect, hasPrev: hasPrevPanel) }
	1376	}
	1377	}
	1378
	1379	private func clipTitle(_ clip: Clip, media: MediaItem?) -> String {
	1380	var title = media?.displayName
	1381	?? (clip.kind == .storyboard
	1382	? (panelNamesCache[clip.id] ?? "Panel") : "missing media")
	1383	if clip.kind != .storyboard && media == nil { title = "⚠︎ " + title }
	1384	if clip.kind == .audio { title = "♪ " + title }
	1385	return title
	1386	}
	1387
	1388	/// Re-pin the title of any clip whose left edge is scrolled offscreen: the
	1389	/// label follows the view edge (as it always has), but the pinning is an
	1390	/// overlay so it is never baked into a scene tile. The patch repaints the
	1391	/// clip's own strip pixels under the new label position (covering the
	1392	/// baked, unpinned label's tail), then restrokes the border segment it
	1393	/// covered — output matches the old single-pass pinned render.
	1394	private func drawPinnedLabels(ref: TrackRef, lane: NSRect) {
	1395	let leftSec = secondsFor(headerW)
	1396	let colors = laneColors(ref)
	1397	let clips = clipsByLane[ref] ?? []
	1398	// Only clips STRADDLING the left edge qualify; binary search the
	1399	// candidate window instead of scanning every clip left of the view.
	1400	for i in visibleIndexRange(clips, lane: ref, left: leftSec, right: leftSec) {
	1401	let clip = clips[i]
	1402	guard clip.start < leftSec, clip.end > leftSec else { continue }
	1403	let x0 = xFor(clip.start), x1 = xFor(clip.end)
	1404	let rect = NSRect(x: x0, y: lane.minY, width: max(2, x1 - x0),
	1405	height: lane.height)
	1406	guard rect.width >= 22 else { continue }
	1407	let media = clip.mediaId.flatMap { mediaById[$0] }
	1408	let title = clipTitle(clip, media: media)
	1409	let selected = store.selection.contains(clip.id)
	1410	let linkedSel = !selected && linkedSelectionCache.contains(clip.id)
	1411	let overlapping = (overlapIdsByLane[ref] ?? []).contains(clip.id)
	1412
	1413	let labelW = title.size(withAttributes: Self.titleAttrs).width
	1414	let patch = NSRect(x: headerW, y: rect.minY,
	1415	width: min(labelW + 12, rect.maxX - headerW), height: 13)
	1416	let storyboard = clip.kind == .storyboard
	1417	let cx1 = min(rect.maxX, bounds.width + 12)
	1418	let cardRect = NSRect(x: max(rect.minX, headerW - 12), y: rect.minY,
	1419	width: cx1 - max(rect.minX, headerW - 12),
	1420	height: rect.height)
	1421	let bodyRect = storyboard
	1422	? NSRect(x: cardRect.minX, y: cardRect.minY + 0.5,
	1423	width: cardRect.width, height: cardRect.height - 1)
	1424	: cardRect.insetBy(dx: 0.5, dy: 0.5)
	1425	let radius: CGFloat = storyboard ? 0 : 3
	1426	let body = NSBezierPath(roundedRect: bodyRect, xRadius: radius, yRadius: radius)
	1427
	1428	NSGraphicsContext.current?.saveGraphicsState()
	1429	NSRect(x: patch.minX, y: patch.minY, width: patch.width,
	1430	height: patch.height).clip()
	1431	body.addClip()
	1432	// Rebuild the strip composite: body color under the 0.85-alpha strip.
	1433	switch clip.kind {
	1434	case .storyboard: NSColor(calibratedWhite: 0.88, alpha: 1).setFill()
	1435	case .audio: colors.audioBody.setFill()
	1436	case .video: (media == nil ? NSColor(calibratedWhite: 0.25, alpha: 1)
	1437	: colors.videoBody).setFill()
797	1438	}
798		if hasPrev {
799		if clip.newShot {
800		NSColor.systemOrange.setFill()
801		NSRect(x: rect.minX - 1.5, y: rect.minY, width: 3, height: rect.height).fill()
802		} else {
803		NSColor(calibratedWhite: Theme.light ? 0.45 : 0.30, alpha: 1).setFill()
804		NSRect(x: rect.minX - 0.5, y: rect.minY, width: 1, height: rect.height).fill()
805		}
	1439	patch.fill()
	1440	colors.strip.setFill()
	1441	patch.fill()
	1442	drawTitle(title, at: NSPoint(x: headerW + 5, y: rect.minY + 1))
	1443	if selected \|\| linkedSel {
	1444	(selected ? NSColor.controlAccentColor : NSColor.systemCyan)
	1445	.withAlphaComponent(selected ? 0.34 : 0.20).setFill()
	1446	patch.fill()
	1447	}
	1448	NSGraphicsContext.current?.restoreGraphicsState()
	1449
	1450	// Restroke the border segment the patch painted over — clipped to
	1451	// the patch only (drawClip strokes the border unclipped, so a
	1452	// body clip here would shave its outer antialiasing).
	1453	if !storyboard \|\| selected \|\| linkedSel \|\| overlapping {
	1454	NSGraphicsContext.current?.saveGraphicsState()
	1455	patch.insetBy(dx: 0, dy: -1).clip()
	1456	let border = NSBezierPath(
	1457	roundedRect: cardRect.insetBy(dx: 1.25, dy: 1.25),
	1458	xRadius: radius, yRadius: radius)
	1459	border.lineWidth = selected ? 3.5 : linkedSel ? 3 : (overlapping ? 2 : 1.5)
	1460	(selected ? Theme.selection
	1461	: linkedSel ? NSColor.systemCyan
	1462	: overlapping ? NSColor.systemRed : colors.base).setStroke()
	1463	border.stroke()
	1464	NSGraphicsContext.current?.restoreGraphicsState()
806	1465	}
807	1466	}
808	1467	}
809	1468
810		private func drawFilmstrip(_ clip: Clip, media: MediaItem, rect: NSRect) {
	1469	/// Shot divider: an opaque line sitting ON the boundary between two
	1470	/// storyboard panels (they tile gaplessly). A new shot gets a bold
	1471	/// orange bar; frames within a shot get a thin neutral line. The first
	1472	/// panel of the track has no divider on its left.
	1473	private func drawShotDivider(_ clip: Clip, rect: NSRect, hasPrev: Bool) {
	1474	guard hasPrev else { return }
	1475	if clip.newShot {
	1476	NSColor.systemOrange.setFill()
	1477	NSRect(x: rect.minX - 1.5, y: rect.minY, width: 3, height: rect.height).fill()
	1478	} else {
	1479	NSColor(calibratedWhite: Theme.light ? 0.45 : 0.30, alpha: 1).setFill()
	1480	NSRect(x: rect.minX - 0.5, y: rect.minY, width: 1, height: rect.height).fill()
	1481	}
	1482	}
	1483
	1484	private func drawFilmstrip(_ clip: Clip, media: MediaItem, rect: NSRect,
	1485	cullX0: CGFloat, cullX1: CGFloat) {
811	1486	let thumbH = rect.height - 14
812	1487	guard thumbH > 6 else { return }
813	1488	let mediaAspect = media.width > 0 && media.height > 0
814	1489	? CGFloat(media.width) / CGFloat(media.height) : 16.0 / 9.0
815	1490	let thumbW = thumbH * mediaAspect
816		let visX0 = max(rect.minX, headerW), visX1 = min(rect.maxX, bounds.width)
	1491	// Thumb tiling stays phase-anchored to the clip's TRUE left edge (so
	1492	// thumbnails never slide as the window changes); the window only culls.
	1493	let visX0 = max(rect.minX, cullX0), visX1 = min(rect.maxX, cullX1)
	1494	guard let cg = NSGraphicsContext.current?.cgContext else { return }
817	1495	var x = rect.minX + floor((visX0 - rect.minX) / thumbW) * thumbW
818	1496	while x < visX1 {
819	1497	let tlSec = secondsFor(x + thumbW / 2)
820	1498	let srcSec = clip.sourceTime(at: tlSec)
821	1499	if let img = MediaPipeline.shared.filmstripImage(for: media, at: max(0, srcSec)) {
822	1500	if DrawProf.on { DrawProf.thumbHits += 1 }
823		img.draw(in: NSRect(x: x, y: rect.minY + 14, width: thumbW, height: thumbH),
824		from: .zero, operation: .sourceOver, fraction: 0.9)
	1501	// CGContext blit with a local flip (CGImages draw bottom-up;
	1502	// the view is flipped). The images are pre-converted to the
	1503	// display's format, so this is a plain copy.
	1504	cg.saveGState()
	1505	cg.setAlpha(0.9)
	1506	cg.translateBy(x: x, y: rect.minY + 14 + thumbH)
	1507	cg.scaleBy(x: 1, y: -1)
	1508	cg.draw(img, in: CGRect(x: 0, y: 0, width: thumbW, height: thumbH))
	1509	cg.restoreGState()
825	1510	}
826	1511	x += thumbW
827	1512	}
...	...	@@ -829,20 +1514,36 @@ final class TimelineView: NSView {
829	1514	rect.fill()
830	1515	}
831	1516
832		private func drawWaveform(_ clip: Clip, media: MediaItem, rect: NSRect, color: NSColor) {
	1517	private func drawWaveform(_ clip: Clip, media: MediaItem, rect: NSRect, color: NSColor,
	1518	cullX0: CGFloat, cullX1: CGFloat) {
833	1519	// Center line
834	1520	color.withAlphaComponent(0.35).setFill()
835	1521	NSRect(x: rect.minX, y: rect.midY + 6, width: rect.width, height: 1).fill()
836	1522	guard let img = MediaPipeline.shared.waveformImage(for: media), media.duration > 0
837	1523	else { return }
838		let imgW = img.size.width
	1524	// Draw only the visible span — a zoomed-in clip's full rect can be
	1525	// millions of points wide, and image draws at that size are slow even
	1526	// though it's all clipped away. CGImage has no source-rect draw, so
	1527	// map the FULL image through the source→dest transform and clip to
	1528	// the visible span: pixel-identical to a fractional source rect
	1529	// (cropping(to:) would round to whole source pixels), and Quartz only
	1530	// rasterizes the clipped part.
	1531	let visX0 = max(rect.minX, cullX0 - 2), visX1 = min(rect.maxX, cullX1 + 2)
	1532	guard visX1 > visX0, let cg = NSGraphicsContext.current?.cgContext else { return }
	1533	let imgW = CGFloat(img.width)
839	1534	let fromX = CGFloat(clip.srcIn / media.duration) * imgW
840		let fromW = CGFloat(clip.duration / media.duration) * imgW
	1535	let fromW = max(1, CGFloat(clip.duration / media.duration) * imgW)
841	1536	let dest = NSRect(x: rect.minX, y: rect.minY + 14,
842	1537	width: rect.width, height: rect.height - 16)
843		img.draw(in: dest, from: NSRect(x: fromX, y: 0, width: max(1, fromW),
844		height: img.size.height),
845		operation: .sourceOver, fraction: 0.85)
	1538	let scaleX = dest.width / fromW
	1539	cg.saveGState()
	1540	cg.setAlpha(0.85)
	1541	cg.clip(to: CGRect(x: visX0, y: dest.minY, width: visX1 - visX0,
	1542	height: dest.height))
	1543	cg.translateBy(x: dest.minX - fromX * scaleX, y: dest.maxY)
	1544	cg.scaleBy(x: 1, y: -1)
	1545	cg.draw(img, in: CGRect(x: 0, y: 0, width: imgW * scaleX, height: dest.height))
	1546	cg.restoreGState()
846	1547	}
847	1548
848	1549	private func drawFades(_ clip: Clip, rect: NSRect, selected: Bool) {
...	...	@@ -867,7 +1568,16 @@ final class TimelineView: NSView {
867	1568	let xOut = xFor(clip.end - clip.fadeOut)
868	1569	if clip.fadeIn > 0.001 { fadeShape(from: xFor(clip.start), to: xIn, leading: true) }
869	1570	if clip.fadeOut > 0.001 { fadeShape(from: xFor(clip.end), to: xOut, leading: false) }
870		// Handles (always visible so fades stay discoverable).
	1571	drawFadeHandles(clip, rect: rect, selected: selected)
	1572	}
	1573
	1574	/// Fade handles (always visible so fades stay discoverable). Split out of
	1575	/// `drawFades` because narrow (LOD) clips draw the handles — they're the
	1576	/// speckled texture of a dense audio lane — without the fade shapes.
	1577	private func drawFadeHandles(_ clip: Clip, rect: NSRect, selected: Bool) {
	1578	let top = rect.minY + 13
	1579	let xIn = xFor(clip.start + clip.fadeIn)
	1580	let xOut = xFor(clip.end - clip.fadeOut)
871	1581	for x in [xIn, xOut] {
872	1582	let r = NSRect(x: x - 3.5, y: top - 3.5 + 4, width: 7, height: 7)
873	1583	(selected ? NSColor.white : NSColor(calibratedWhite: 0.85, alpha: 0.9)).setFill()
...	...	@@ -891,8 +1601,9 @@ final class TimelineView: NSView {
891	1601	x += w + 2
892	1602	break // one panel image; boards are one still, no need to tile
893	1603	}
894		NSImage(systemSymbolName: "pencil.and.outline", accessibilityDescription: nil)?
895		.tinted(NSColor(calibratedWhite: 0.2, alpha: 1))
	1604	Self.bakedSymbol("pencil.and.outline",
	1605	tint: NSColor(calibratedWhite: 0.2, alpha: 1),
	1606	key: "board.pencil")?
896	1607	.draw(in: NSRect(x: rect.minX + 4, y: rect.minY + 16, width: 11, height: 11),
897	1608	from: .zero, operation: .sourceOver, fraction: 0.9)
898	1609	}
...	...	@@ -901,7 +1612,7 @@ final class TimelineView: NSView {
901	1612
902	1613	private func drawFusionBand() {
903	1614	guard fusionBandH > 0 else { return }
904		let band = NSRect(x: 0, y: rulerH, width: bounds.width, height: fusionBandH)
	1615	let band = NSRect(x: 0, y: fusionTop, width: bounds.width, height: fusionBandH)
905	1616	NSColor(calibratedRed: 0.16, green: 0.14, blue: 0.05, alpha: 1).setFill()
906	1617	band.fill()
907	1618	FusionComps.yellow.withAlphaComponent(0.5).setFill()
...	...	@@ -943,10 +1654,10 @@ final class TimelineView: NSView {
943	1654	}
944	1655
945	1656	private func compAt(point: NSPoint) -> FusionComp? {
946		guard fusionBandH > 0, point.y > rulerH, point.y < rulerH + fusionBandH
	1657	guard fusionBandH > 0, point.y > fusionTop, point.y < fusionTop + fusionBandH
947	1658	else { return nil }
948	1659	let fps = project.fps
949		let band = NSRect(x: 0, y: rulerH, width: bounds.width, height: fusionBandH)
	1660	let band = NSRect(x: 0, y: fusionTop, width: bounds.width, height: fusionBandH)
950	1661	for (comp, lane, lanes) in comps.stacked() {
951	1662	let x0 = xFor(comp.startSeconds(fps: fps))
952	1663	let x1 = xFor(comp.endSeconds(fps: fps))
...	...	@@ -958,6 +1669,109 @@ final class TimelineView: NSView {
958	1669	return nil
959	1670	}
960	1671
	1672	// MARK: - Optimization strip
	1673
	1674	/// Per-column optimization state for the thin band under the ruler:
	1675	/// GREEN — every proxy chunk the visible tracks need at that time is
	1676	/// built at the preview-quality target; DIM GREEN — built but below
	1677	/// target (usable now, upgrade queued); YELLOW — building right now (or
	1678	/// a rescue slice is standing in); RED — no proxy on disk (never built,
	1679	/// evicted, or failed). Aggregated worst-wins across visible video
	1680	/// tracks, so one glance says whether playing here will be instant.
	1681	///
	1682	/// The runs are cached — recomputed only when the view moves (origin/
	1683	/// zoom/width) or something actually changed (.projectChanged /
	1684	/// .mediaStatusChanged clear the key) — so playback frames just re-fill
	1685	/// a few dozen rects.
	1686	private var stripRuns: [(x: CGFloat, w: CGFloat, color: NSColor)] = []
	1687	private var stripKey: (origin: Double, pps: Double, width: CGFloat)?
	1688
	1689	private func rebuildStripIfNeeded() {
	1690	if let k = stripKey, k.origin == originSecond, k.pps == pxPerSecond,
	1691	k.width == bounds.width { return }
	1692	stripKey = (originSecond, pxPerSecond, bounds.width)
	1693	stripRuns.removeAll(keepingCapacity: true)
	1694	rebuildSceneIfNeeded()
	1695
	1696	let colW: CGFloat = 2
	1697	let ncols = Int((bounds.width - headerW) / colW) + 1
	1698	guard ncols > 0 else { return }
	1699	var vals = [UInt8](repeating: .max, count: ncols)
	1700	let leftSec = secondsFor(headerW), rightSec = secondsFor(bounds.width)
	1701	var snaps: [String: ChunkManager.StripSnapshot?] = [:]
	1702
	1703	func mark(_ lo: Double, _ hi: Double, _ v: UInt8) {
	1704	let c0 = max(0, Int((xFor(lo) - headerW) / colW))
	1705	let c1 = min(ncols - 1, Int((xFor(hi) - headerW) / colW))
	1706	guard c1 >= c0 else { return }
	1707	for c in c0...c1 where vals[c] > v { vals[c] = v }
	1708	}
	1709
	1710	for ref in laneRows {
	1711	guard ref.videoIndex != nil, !session.hiddenTracks.contains(ref) else { continue }
	1712	let clips = clipsByLane[ref] ?? []
	1713	for i in visibleIndexRange(clips, lane: ref, left: leftSec, right: rightSec) {
	1714	let clip = clips[i]
	1715	guard clip.kind == .video,
	1716	let media = project.media(clip.mediaId), !media.isAudio,
	1717	media.duration > 0 else { continue }
	1718	let a = max(clip.start, leftSec), b = min(clip.end, rightSec)
	1719	guard b > a else { continue }
	1720	let snap: ChunkManager.StripSnapshot?
	1721	if let cached = snaps[media.cacheKey] { snap = cached }
	1722	else { snap = ctx.chunks.stripSnapshot(media: media); snaps[media.cacheKey] = snap }
	1723	guard let snap else { mark(a, b, 0); continue } // unscanned: unknown
	1724	if snap.fullProxy { mark(a, b, 3); continue } // legacy whole-file proxy
	1725	let srcA = clip.srcIn + (a - clip.start) * clip.speed
	1726	let srcB = clip.srcIn + (b - clip.start) * clip.speed
	1727	let ci = min(snap.n - 1, ChunkManager.chunkIndex(forSource: min(srcA, srcB)))
	1728	let cj = min(snap.n - 1, ChunkManager.chunkIndex(forSource: max(srcA, srcB) - 1e-6))
	1729	for idx in ci...max(ci, cj) {
	1730	let v: UInt8
	1731	if let w = snap.built[idx] {
	1732	v = w >= snap.target ? 3 : 2
	1733	} else if snap.inFlight.contains(idx) \|\| snap.partial.contains(idx) {
	1734	v = 1
	1735	} else {
	1736	v = 0 // missing, evicted, or failed
	1737	}
	1738	let t0 = clip.start
	1739	+ (Double(idx) * ChunkManager.chunkSeconds - clip.srcIn) / max(1e-4, clip.speed)
	1740	let t1 = clip.start
	1741	+ (Double(idx + 1) * ChunkManager.chunkSeconds - clip.srcIn) / max(1e-4, clip.speed)
	1742	mark(max(min(t0, t1), a), min(max(t0, t1), b), v)
	1743	}
	1744	}
	1745	}
	1746
	1747	// Compress equal-valued columns into fill runs.
	1748	let palette = [Theme.stripMissing, Theme.stripBuilding,
	1749	Theme.stripUsable, Theme.stripFull]
	1750	var c = 0
	1751	while c < ncols {
	1752	let v = vals[c]
	1753	var e = c + 1
	1754	while e < ncols, vals[e] == v { e += 1 }
	1755	if v != .max {
	1756	stripRuns.append((x: headerW + CGFloat(c) * colW,
	1757	w: CGFloat(e - c) * colW,
	1758	color: palette[Int(v)]))
	1759	}
	1760	c = e
	1761	}
	1762	}
	1763
	1764	private func drawOptimizeStrip() {
	1765	Theme.timelineBg.setFill()
	1766	NSRect(x: 0, y: rulerH, width: bounds.width, height: stripH).fill()
	1767	rebuildStripIfNeeded()
	1768	let y = rulerH + 1
	1769	for run in stripRuns {
	1770	run.color.setFill()
	1771	NSRect(x: run.x, y: y, width: run.w, height: stripH - 2).fill()
	1772	}
	1773	}
	1774
961	1775	// MARK: - Ruler / playhead / indicators
962	1776
963	1777	private func drawRuler() {
...	...	@@ -1164,7 +1978,7 @@ final class TimelineView: NSView {
1164	1978	// MARK: - Mouse editing
1165	1979
1166	1980	private enum DragMode {
1167		case none, scrub, move, trimIn, trimOut, rippleOut, slip,
	1981	case none, scrub, move, trimIn, trimOut, rippleOut, rippleIn, slip,
1168	1982	stretchIn, stretchOut, fadeIn, fadeOut, box, resizeTrack,
1169	1983	hBarPan, hBarLeft, hBarRight, vBarPan, vBarTop, vBarBottom
1170	1984	}
...	...	@@ -1235,7 +2049,7 @@ final class TimelineView: NSView {
1235	2049	return
1236	2050	}
1237	2051
1238		if p.y < rulerH {
	2052	if p.y < rulerH + stripH { // ruler + optimization strip both scrub
1239	2053	drag.mode = .scrub
1240	2054	playback.setRate(0)
1241	2055	playback.seek(to: max(0, quantize(secondsFor(p.x))))
...	...	@@ -1243,8 +2057,8 @@ final class TimelineView: NSView {
1243	2057	}
1244	2058
1245	2059	// Fusion band header: hide preview (top) / focus (bottom)
1246		if fusionBandH > 0, p.x < headerW, p.y > rulerH, p.y < lanesTop {
1247		if p.y < rulerH + fusionBandH * 0.55 { session.fusionHidden.toggle() }
	2060	if fusionBandH > 0, p.x < headerW, p.y > fusionTop, p.y < lanesTop {
	2061	if p.y < fusionTop + fusionBandH * 0.55 { session.fusionHidden.toggle() }
1248	2062	else { session.fusionFocus.toggle() }
1249	2063	needsDisplay = true
1250	2064	return
...	...	@@ -1348,13 +2162,17 @@ final class TimelineView: NSView {
1348	2162	if drag.mode == .none {
1349	2163	let stretch = event.modifierFlags.contains(.command) && clip.kind == .video
1350	2164	let opt = event.modifierFlags.contains(.option)
1351		if opt, rect.maxX - p.x < edge {
1352		drag.mode = .rippleOut // ⌥-drag out edge: push everything after
	2165	let onIn = p.x - rect.minX < edge
	2166	let onOut = rect.maxX - p.x < edge
	2167	if opt, onOut {
	2168	drag.mode = .rippleOut // ⌥-drag out edge: ripple the tail away
	2169	} else if opt, onIn, clip.kind != .storyboard {
	2170	drag.mode = .rippleIn // ⌥-drag in edge: ripple-trim the head
1353	2171	} else if opt \|\| session.mainTool == .slide {
1354		drag.mode = .slip
1355		} else if p.x - rect.minX < edge {
	2172	drag.mode = .slip // ⌥-drag body: slip source under the clip
	2173	} else if onIn {
1356	2174	drag.mode = stretch ? .stretchIn : .trimIn
1357		} else if rect.maxX - p.x < edge {
	2175	} else if onOut {
1358	2176	drag.mode = stretch ? .stretchOut : .trimOut
1359	2177	} else {
1360	2178	drag.mode = .move
...	...	@@ -1395,7 +2213,7 @@ final class TimelineView: NSView {
1395	2213
1396	2214	// Dragging against the view edges pans the timeline (there's no
1397	2215	// enclosing scroll view, so the playhead could never leave the screen).
1398		if [.scrub, .move, .trimIn, .trimOut, .rippleOut, .slip,
	2216	if [.scrub, .move, .trimIn, .trimOut, .rippleOut, .rippleIn, .slip,
1399	2217	.stretchIn, .stretchOut, .fadeIn, .fadeOut].contains(drag.mode) {
1400	2218	if p.x > bounds.width - 30 {
1401	2219	originSecond += Double(p.x - (bounds.width - 30)) * 0.12 / pxPerSecond
...	...	@@ -1413,6 +2231,7 @@ final class TimelineView: NSView {
1413	2231	case .trimIn: dragTrimIn(dSec: dSec)
1414	2232	case .trimOut: dragTrimOut(dSec: dSec)
1415	2233	case .rippleOut: dragRippleOut(dSec: dSec)
	2234	case .rippleIn: dragRippleIn(dSec: dSec)
1416	2235	case .slip: dragSlip(dSec: dSec)
1417	2236	case .stretchIn: dragStretch(dSec: dSec, fromStart: true)
1418	2237	case .stretchOut: dragStretch(dSec: dSec, fromStart: false)
...	...	@@ -1458,8 +2277,9 @@ final class TimelineView: NSView {
1458	2277	case .box:
1459	2278	let r = boxRect()
1460	2279	var hit = drag.baseSelection
1461		for (row, ref) in project.laneRefs.enumerated() {
1462		for clip in project.clips(on: ref)
	2280	rebuildSceneIfNeeded()
	2281	for (row, ref) in laneRows.enumerated() {
	2282	for clip in clipsByLane[ref] ?? []
1463	2283	where clipRect(clip, row: row).intersects(r) {
1464	2284	hit.insert(clip.id)
1465	2285	}
...	...	@@ -1472,12 +2292,6 @@ final class TimelineView: NSView {
1472	2292	session.trackHeights[ref] = min(4, max(0.35, factor))
1473	2293	}
1474	2294	}
1475		// Dragging the floating scrollbars is a scroll/zoom — simplify while it
1476		// moves, like the wheel and pinch paths.
1477		if [.hBarPan, .hBarLeft, .hBarRight,
1478		.vBarPan, .vBarTop, .vBarBottom].contains(drag.mode) {
1479		noteScrolling()
1480		}
1481	2295	drag.moved = true
1482	2296	autoscroll(with: event)
1483	2297	needsDisplay = true
...	...	@@ -1485,7 +2299,7 @@ final class TimelineView: NSView {
1485	2299
1486	2300	override func mouseUp(with event: NSEvent) {
1487	2301	switch drag.mode {
1488		case .move, .trimIn, .trimOut, .rippleOut, .slip,
	2302	case .move, .trimIn, .trimOut, .rippleOut, .rippleIn, .slip,
1489	2303	.stretchIn, .stretchOut, .fadeIn, .fadeOut:
1490	2304	store.endGesture()
1491	2305	default:
...	...	@@ -1518,7 +2332,6 @@ final class TimelineView: NSView {
1518	2332	if maxScrollY > 0 {
1519	2333	scrollY = min(max(0, panDrag.origScrollY - (p.y - panDrag.start.y)), maxScrollY)
1520	2334	}
1521		noteScrolling()
1522	2335	needsDisplay = true
1523	2336	}
1524	2337
...	...	@@ -1532,14 +2345,11 @@ final class TimelineView: NSView {
1532	2345	// Vertical retracking only for a lone unlinked clip.
1533	2346	let multi = drag.origSelection.count > 1 \|\| store.selection.count > 1
1534	2347
1535		var delta = dSec
1536		if let adj = snapAdjust(start: orig.start + dSec, duration: orig.duration,
1537		excluding: Set(drag.origSelection.keys)) {
1538		delta += adj.adjust
1539		activeSnapTarget = adj.target
1540		}
1541		// Frame-quantize the moved edge, clamp to t >= 0 for all moved clips.
1542		delta = quantize(orig.start + delta) - orig.start
	2348	// Snap+quantize the moved start edge, then clamp to t >= 0 for all moved clips.
	2349	let snappedStart = snapAndQuantize(orig.start + dSec,
	2350	excluding: Set(drag.origSelection.keys),
	2351	duration: orig.duration)
	2352	var delta = snappedStart - orig.start
1543	2353	let minStart = drag.origSelection.values.map(\.start).min() ?? 0
1544	2354	if minStart + delta < 0 { delta = -minStart }
1545	2355
...	...	@@ -1625,6 +2435,16 @@ final class TimelineView: NSView {
1625	2435	}
1626	2436	}
1627	2437
	2438	/// A trim/slip drag is exposing source material the clip didn't use
	2439	/// before — tell the proxy builder NOW (mid-drag), not at mouse-up, so
	2440	/// the newly extended range is often already covered when the user plays
	2441	/// it. `direction` is which way the exposure grows in source time.
	2442	private func prefetchExposure(_ orig: Clip, sourceTime: Double, direction: Int) {
	2443	guard orig.kind == .video, let media = project.media(orig.mediaId) else { return }
	2444	ctx.chunks.noteGestureExposure(media: media, sourceTime: sourceTime,
	2445	direction: direction)
	2446	}
	2447
1628	2448	/// Non-audio clips on the same track whose head would be swallowed by
1629	2449	/// dragging `orig`'s out-edge to `newEnd` (audio layers freely, so it
1630	2450	/// never gets pushed).
...	...	@@ -1657,12 +2477,7 @@ final class TimelineView: NSView {
1657	2477	return
1658	2478	}
1659	2479	let media = project.media(orig.mediaId)
1660		var desired = orig.end + dSec
1661		if let adj = snapAdjust(start: desired, duration: 0, excluding: [orig.id]) {
1662		desired += adj.adjust
1663		activeSnapTarget = adj.target
1664		}
1665		desired = quantize(desired)
	2480	let desired = snapAndQuantize(orig.end + dSec, excluding: [orig.id])
1666	2481	var maxEnd = Double.greatestFiniteMagnitude
1667	2482	if let media {
1668	2483	maxEnd = orig.start + (media.duration - orig.srcIn) / max(0.001, orig.speed)
...	...	@@ -1677,6 +2492,10 @@ final class TimelineView: NSView {
1677	2492	// The grabbed clip's clamped change is the delta applied to every
1678	2493	// selected/linked clip.
1679	2494	let delta = newEnd - orig.end
	2495	if delta > 0 { // extending the tail exposes fresh source material
	2496	prefetchExposure(orig, sourceTime: orig.srcIn + (newEnd - orig.start) * orig.speed,
	2497	direction: 1)
	2498	}
1680	2499	let targets = drag.origSelection.values.filter { $0.kind != .storyboard }
1681	2500	let single = targets.count <= 1
1682	2501	store.updateGesture { model in
...	...	@@ -1703,12 +2522,7 @@ final class TimelineView: NSView {
1703	2522
1704	2523	private func dragTrimIn(dSec: Double) {
1705	2524	guard let orig = drag.origClip else { return }
1706		var desired = orig.start + dSec
1707		if let adj = snapAdjust(start: desired, duration: 0, excluding: [orig.id]) {
1708		desired += adj.adjust
1709		activeSnapTarget = adj.target
1710		}
1711		desired = quantize(desired)
	2525	let desired = snapAndQuantize(orig.start + dSec, excluding: [orig.id])
1712	2526	// Storyboard panels are pure start positions (no source media), so the
1713	2527	// in-edge just slides the panel's start either way — bounded only by the
1714	2528	// previous panel (a frame of clearance) and this panel's own end.
...	...	@@ -1732,6 +2546,10 @@ final class TimelineView: NSView {
1732	2546	minStart = max(0, minStart)
1733	2547	let maxStart = orig.end - frameDur
1734	2548	let newStart = min(max(desired, minStart), maxStart)
	2549	if newStart < orig.start { // extending the head exposes earlier source
	2550	prefetchExposure(orig, sourceTime: orig.srcIn + (newStart - orig.start) * orig.speed,
	2551	direction: -1)
	2552	}
1735	2553	let base = store.gestureBaseModel ?? project
1736	2554	// The grabbed clip's clamped change is the delta applied to every
1737	2555	// selected/linked clip. A storyboard in-edge just moves that panel's
...	...	@@ -1768,12 +2586,7 @@ final class TimelineView: NSView {
1768	2586	private func dragRippleOut(dSec: Double) {
1769	2587	guard let orig = drag.origClip else { return }
1770	2588	let base = store.gestureBaseModel ?? project
1771		var desired = quantize(orig.end + dSec)
1772		if let adj = snapAdjust(start: desired, duration: 0, excluding: [orig.id]) {
1773		desired += adj.adjust
1774		activeSnapTarget = adj.target
1775		desired = quantize(desired)
1776		}
	2589	let desired = snapAndQuantize(orig.end + dSec, excluding: [orig.id])
1777	2590	var newEnd = max(desired, orig.start + frameDur)
1778	2591	if orig.kind == .video, let media = base.media(orig.mediaId) {
1779	2592	newEnd = min(newEnd, orig.start + (media.duration - orig.srcIn) / max(0.001, orig.speed))
...	...	@@ -1785,6 +2598,11 @@ final class TimelineView: NSView {
1785	2598	// Never push anything below t = 0.
1786	2599	let minStart = followers.map(\.start).min() ?? 0
1787	2600	let clampedDelta = max(delta, -minStart)
	2601	if clampedDelta > 0 { // ripple-extending the tail exposes fresh source
	2602	prefetchExposure(orig,
	2603	sourceTime: orig.srcIn + (orig.end + clampedDelta - orig.start) * orig.speed,
	2604	direction: 1)
	2605	}
1788	2606	store.updateGesture { model in
1789	2607	if orig.kind != .storyboard,
1790	2608	let i = model.clips.firstIndex(where: { $0.id == orig.id }) {
...	...	@@ -1797,10 +2615,54 @@ final class TimelineView: NSView {
1797	2615	}
1798	2616	}
1799	2617
	2618	/// ⌥-drag a clip's IN edge: ripple-trim the head while pinning the clip's
	2619	/// start. The in-point (`srcIn`) and length change —
	2620	/// the clip's OUT edge moves — and every later clip on the track shifts by the
	2621	/// same amount so the timeline stays gapless. Unlike a normal trim-in (which
	2622	/// slides the clip's start and opens blank space before it), the start stays
	2623	/// put and the space is taken out of the track. Dragging right trims the head
	2624	/// (clip shrinks, followers pull in); left extends it (clip grows, followers
	2625	/// push out). The out edge — the source out-point — never moves.
	2626	private func dragRippleIn(dSec: Double) {
	2627	guard let orig = drag.origClip, orig.kind != .storyboard else { return }
	2628	let base = store.gestureBaseModel ?? project
	2629	let followers = base.clips.filter {
	2630	$0.id != orig.id && $0.track == orig.track && $0.start >= orig.end - 1e-9
	2631	}
	2632	// Snap the moving OUT edge to static references only — the followers ride
	2633	// along with it, so they can't be snap targets. d > 0 trims the head.
	2634	var exclude = Set(followers.map(\.id)); exclude.insert(orig.id)
	2635	let newEnd = snapAndQuantize(orig.end - dSec, excluding: exclude)
	2636	var d = orig.end - newEnd
	2637	d = min(d, orig.duration - frameDur) // keep ≥ one frame
	2638	d = max(d, -orig.srcIn / max(0.001, orig.speed)) // head ≥ source start
	2639	if let firstStart = followers.map(\.start).min() { // followers ≥ t = 0
	2640	d = min(d, firstStart)
	2641	}
	2642	if d < 0 { // ripple-extending the head exposes earlier source
	2643	prefetchExposure(orig, sourceTime: orig.srcIn + d * orig.speed, direction: -1)
	2644	}
	2645	store.updateGesture { model in
	2646	guard let i = model.clips.firstIndex(where: { $0.id == orig.id }) else { return }
	2647	model.clips[i].srcIn = orig.srcIn + d * orig.speed
	2648	model.clips[i].duration = orig.duration - d
	2649	for f in followers {
	2650	guard let j = model.clips.firstIndex(where: { $0.id == f.id }) else { continue }
	2651	model.clips[j].start = f.start - d
	2652	}
	2653	}
	2654	}
	2655
1800	2656	private func dragSlip(dSec: Double) {
1801	2657	guard let orig = drag.origClip, let media = project.media(orig.mediaId) else { return }
1802	2658	let maxIn = max(0, media.duration - orig.sourceLength)
1803	2659	let newIn = min(max(orig.srcIn - dSec * orig.speed, 0), maxIn)
	2660	// Slipping reveals source on the side the content is sliding from.
	2661	if newIn < orig.srcIn {
	2662	prefetchExposure(orig, sourceTime: newIn, direction: -1)
	2663	} else if newIn > orig.srcIn {
	2664	prefetchExposure(orig, sourceTime: newIn + orig.sourceLength, direction: 1)
	2665	}
1804	2666	store.updateGesture { model in
1805	2667	guard let i = model.clips.firstIndex(where: { $0.id == drag.clipId }) else { return }
1806	2668	model.clips[i].srcIn = newIn
...	...	@@ -1847,6 +2709,21 @@ final class TimelineView: NSView {
1847	2709	}
1848	2710	}
1849	2711
	2712	/// The single place edge alignment is decided: snap `desired` to nearby clip
	2713	/// edges / playhead / 0 (unless snapping is off), record the snap indicator,
	2714	/// then frame-quantize — snap FIRST, quantize ONCE. Every drag handler routes
	2715	/// through here so trims, moves and ripples align identically (previously each
	2716	/// re-implemented this, and the ripple handler quantized twice out of order).
	2717	private func snapAndQuantize(_ desired: Double, excluding: Set<UUID>,
	2718	duration: Double = 0) -> Double {
	2719	var v = desired
	2720	if let adj = snapAdjust(start: v, duration: duration, excluding: excluding) {
	2721	v += adj.adjust
	2722	activeSnapTarget = adj.target
	2723	}
	2724	return quantize(v)
	2725	}
	2726
1850	2727	private func snapAdjust(start: Double, duration: Double, excluding: Set<UUID>)
1851	2728	-> (adjust: Double, target: Double)? {
1852	2729	// Holding ⇧ mid-drag temporarily inverts snapping.
...	...	@@ -1882,36 +2759,50 @@ final class TimelineView: NSView {
1882	2759	}
1883	2760
1884	2761	override func mouseMoved(with event: NSEvent) {
1885		let p = convert(event.locationInWindow, from: nil)
1886		lastMousePoint = p
1887		var cursor = NSCursor.arrow
	2762	lastMousePoint = convert(event.locationInWindow, from: nil)
	2763	cursor(for: event.modifierFlags).set()
	2764	}
	2765
	2766	// Holding a modifier changes what a drag would do, so refresh the cursor even
	2767	// when the pointer is still (mouseMoved won't fire on a bare key press).
	2768	override func flagsChanged(with event: NSEvent) {
	2769	cursor(for: event.modifierFlags).set()
	2770	}
	2771
	2772	/// The cursor for the pointer's current spot, given the held modifiers, so it
	2773	/// previews the gesture a drag would start: ⌥ over a clip body slips it, ⌥/⌘
	2774	/// or a plain hover over an edge resizes (trim / ripple / stretch).
	2775	private func cursor(for mods: NSEvent.ModifierFlags) -> NSCursor {
	2776	let p = lastMousePoint
1888	2777	if let barMode = scrollbarHit(p) {
1889	2778	switch barMode {
1890		case .hBarLeft, .hBarRight: cursor = .resizeLeftRight
1891		case .vBarTop, .vBarBottom: cursor = .resizeUpDown
1892		default: break
1893		}
1894		} else if trackBoundaryAt(y: p.y) != nil, p.y > lanesTop {
1895		cursor = .resizeUpDown
1896		} else if let (clip, row) = clipAt(point: p) {
1897		if session.mainTool == .blade {
1898		cursor = .crosshair
1899		} else if session.mainTool == .slide {
1900		cursor = .openHand
1901		} else {
1902		let rect = clipRect(clip, row: row)
1903		if p.x - rect.minX < 7 \|\| rect.maxX - p.x < 7 {
1904		cursor = .resizeLeftRight
1905		}
	2779	case .hBarLeft, .hBarRight: return .resizeLeftRight
	2780	case .vBarTop, .vBarBottom: return .resizeUpDown
	2781	default: return .arrow
1906	2782	}
1907	2783	}
1908		cursor.set()
	2784	if trackBoundaryAt(y: p.y) != nil, p.y > lanesTop { return .resizeUpDown }
	2785	guard let (clip, row) = clipAt(point: p) else { return .arrow }
	2786	if session.mainTool == .blade { return .crosshair }
	2787	if session.mainTool == .slide { return .openHand }
	2788	let rect = clipRect(clip, row: row)
	2789	let onEdge = p.x - rect.minX < 7 \|\| rect.maxX - p.x < 7
	2790	if mods.contains(.option), !onEdge { return .openHand } // ⌥ body: slip
	2791	return onEdge ? .resizeLeftRight : .arrow
1909	2792	}
1910	2793
1911	2794	// MARK: - Keyboard (fallbacks; the menu bar owns the canonical bindings)
1912	2795
1913	2796	override func keyDown(with event: NSEvent) {
1914	2797	let pc = playback
	2798	// A key pressed WHILE a mouse drag holds an open gesture must not run —
	2799	// a mutating shortcut (split/delete/nudge) calls `store.mutate`, whose
	2800	// `precondition(gestureBase == nil)` would trap mid-drag. Ignore keys
	2801	// until the drag ends; Escape still cancels it.
	2802	if store.gestureBaseModel != nil {
	2803	if event.keyCode == 53 { cancelOperation(nil) } // Esc → cancel drag
	2804	return
	2805	}
1915	2806	switch event.charactersIgnoringModifiers?.lowercased() {
1916	2807	case " ": pc.togglePlay()
1917	2808	case "j": pc.shuttle(-1)
...	...	@@ -2745,7 +3636,7 @@ final class TimelineView: NSView {
2745	3636	add("Rescan Comps", #selector(ctxRescanComps))
2746	3637	return menu
2747	3638	}
2748		if fusionBandH > 0, p.y > rulerH, p.y < lanesTop {
	3639	if fusionBandH > 0, p.y > fusionTop, p.y < lanesTop {
2749	3640	add(session.fusionHidden ? "Show Fusion Preview" : "Hide Fusion Preview",
2750	3641	#selector(ctxToggleFusionHidden))
2751	3642	add(session.fusionFocus ? "Unfocus Fusion" : "Focus Fusion",
...	...	@@ -2888,7 +3779,8 @@ final class TimelineView: NSView {
2888	3779	/// past the last clip (the playhead may live out there), but bounded.
2889	3780	private func clampOrigin(_ o: Double) -> Double {
2890	3781	let overscroll = 600.0 / pxPerSecond
2891		return min(max(o, -overscroll), project.timelineDuration + 120)
	3782	rebuildSceneIfNeeded()
	3783	return min(max(o, -overscroll), cachedTimelineDuration + 120)
2892	3784	}
2893	3785
2894	3786	override func scrollWheel(with event: NSEvent) {
...	...	@@ -2905,12 +3797,10 @@ final class TimelineView: NSView {
2905	3797	originSecond = clampOrigin(originSecond - Double(dx) / pxPerSecond)
2906	3798	}
2907	3799	}
2908		noteScrolling()
2909	3800	needsDisplay = true
2910	3801	}
2911	3802
2912	3803	override func magnify(with event: NSEvent) {
2913		noteScrolling()
2914	3804	zoom(by: 1 + event.magnification, anchorX: convert(event.locationInWindow, from: nil).x)
2915	3805	}
2916	3806
...	...	@@ -2969,7 +3859,7 @@ final class TimelineView: NSView {
2969	3859	let streams = expandDropStreams(droppableFiles(from: sender))
2970	3860	guard !streams.isEmpty else { fileDropPreview = nil; needsDisplay = true; return }
2971	3861	let p = convert(sender.draggingLocation, from: nil)
2972		let count = project.laneRefs.count
	3862	let count = laneRows.count
2973	3863	fileDropPreview = FileDropPreview(
2974	3864	streams: streams,
2975	3865	minOffset: streams.map(\.offset).min() ?? 0,
...	...	@@ -3001,7 +3891,7 @@ final class TimelineView: NSView {
3001	3891	let files = droppableFiles(from: sender)
3002	3892	guard !files.isEmpty else { return false }
3003	3893	let dropSec = max(0, quantize(secondsFor(p.x)))
3004		let row = rowAt(y: p.y).flatMap { $0 < project.laneRefs.count ? $0 : nil }
	3894	let row = rowAt(y: p.y).flatMap { $0 < laneRows.count ? $0 : nil }
3005	3895	importFiles(files, atSecond: dropSec, targetRow: row)
3006	3896	return true
3007	3897	}
...	...	@@ -3011,7 +3901,7 @@ final class TimelineView: NSView {
3011	3901	/// track exactly the way dragging an existing clip down does.
3012	3902	private func drawFileDropPreview() {
3013	3903	guard let dp = fileDropPreview else { return }
3014		let count = project.laneRefs.count
	3904	let count = laneRows.count
3015	3905	for (i, s) in dp.streams.enumerated() {
3016	3906	let row = dp.baseRow + i
3017	3907	let lane = laneRect(row: row)
...	...	@@ -3167,7 +4057,6 @@ final class TimelineView: NSView {
3167	4057	func testVThumb() -> NSRect { vThumbRect() }
3168	4058	func testSetOrigin(_ sec: Double) { originSecond = sec }
3169	4059	func testSetPxPerSecond(_ p: Double) { pxPerSecond = p }
3170		func testSetScrolling(_ b: Bool) { isScrolling = b }
3171	4060	/// Draw straight into the current graphics context (set by the harness),
3172	4061	/// bypassing `cacheDisplay`'s per-call bitmap allocation so we time `draw`.
3173	4062	func testRedraw() { draw(bounds) }

sequencer/Sources/Sequencer/Tools.swift+46-6

...	...	@@ -220,6 +220,8 @@ final class SettingsWindow: NSObject {
220	220	private let compsLabel = NSTextField(labelWithString: "—")
221	221	// Global tab
222	222	private let cacheField = NSTextField(string: "")
	223	private let ramField = NSTextField(string: "")
	224	private let usageLabel = NSTextField(labelWithString: "")
223	225	private let cacheLabel = NSTextField(labelWithString: "")
224	226
225	227	// Aspect label → concrete storyboard resolution (stored in the model as
...	...	@@ -231,9 +233,9 @@ final class SettingsWindow: NSObject {
231	233
232	234	func show() {
233	235	buildIfNeeded()
234		sync()
235		window?.makeKeyAndOrderFront(nil)
	236	window?.makeKeyAndOrderFront(nil) // visible first — sync() guards on it
236	237	NSApp.activate(ignoringOtherApps: true)
	238	sync()
237	239	}
238	240
239	241	private func label(_ s: String) -> NSTextField {
...	...	@@ -242,9 +244,17 @@ final class SettingsWindow: NSObject {
242	244	return l
243	245	}
244	246
	247	/// Key (fields need focus) but never MAIN: `DocumentContext.current`
	248	/// resolves through the main window, so a main Settings window would read
	249	/// a blank headless project (fps/comps/estimate all defaults) AND starve
	250	/// the front-document build gate while it's open.
	251	private final class SettingsPanel: NSWindow {
	252	override var canBecomeMain: Bool { false }
	253	}
	254
245	255	private func buildIfNeeded() {
246	256	guard window == nil else { return }
247		let w = NSWindow(
	257	let w = SettingsPanel(
248	258	contentRect: NSRect(x: 0, y: 0, width: 560, height: 300),
249	259	styleMask: [.titled, .closable],
250	260	backing: .buffered, defer: false)
...	...	@@ -300,13 +310,27 @@ final class SettingsWindow: NSObject {
300	310	cacheField.widthAnchor.constraint(equalToConstant: 60).isActive = true
301	311	let cacheRow = NSStackView(views: [cacheField, NSTextField(labelWithString: "GB")])
302	312	cacheRow.spacing = 4
	313	ramField.target = self
	314	ramField.action = #selector(ramChanged)
	315	ramField.widthAnchor.constraint(equalToConstant: 60).isActive = true
	316	let ramRow = NSStackView(views: [ramField, NSTextField(labelWithString: "GB")])
	317	ramRow.spacing = 4
	318	let ramNote = NSTextField(labelWithString:
	319	"Decoded stand-in frames + player read-ahead; more = fewer hiccups.")
	320	ramNote.textColor = .secondaryLabelColor
	321	ramNote.font = .systemFont(ofSize: 11)
303	322	let reveal = NSButton(title: "Reveal Cache", target: self, action: #selector(revealCache))
304	323	reveal.controlSize = .small
	324	usageLabel.textColor = .secondaryLabelColor
	325	usageLabel.font = .systemFont(ofSize: 11)
305	326	cacheLabel.textColor = .secondaryLabelColor
306	327	cacheLabel.font = .systemFont(ofSize: 11)
307	328
308	329	let globalGrid = NSGridView(views: [
309	330	[label("Proxy cache limit"), cacheRow],
	331	[label("RAM frame cache"), ramRow],
	332	[NSView(), ramNote],
	333	[NSView(), usageLabel],
310	334	[NSView(), reveal],
311	335	[NSView(), cacheLabel],
312	336	])
...	...	@@ -343,7 +367,9 @@ final class SettingsWindow: NSObject {
343	367	}
344	368
345	369	@objc private func sync() {
346		guard window != nil else { return }
	370	// The estimate below walks each media's chunk dir — fine on demand,
	371	// wasteful on every .projectChanged while the window is closed.
	372	guard let window, window.isVisible else { return }
347	373	let project = DocumentContext.current.store.project
348	374	// Rebuild the fps popup: presets plus the project's own rate when it's
349	375	// not a preset (e.g. 29.50 fps probed from a screen recording).
...	...	@@ -363,7 +389,14 @@ final class SettingsWindow: NSObject {
363	389	compsLabel.stringValue = project.compsFolder ?? "not set"
364	390	let gb = UserDefaults.standard.integer(forKey: "maxCacheGB")
365	391	cacheField.stringValue = "\(gb > 0 ? gb : 50)"
366		cacheLabel.stringValue = "Cache: \(MediaPipeline.shared.cacheRoot.path)"
	392	ramField.stringValue = "\(FrameCache.ramGB)"
	393	let pipeline = MediaPipeline.shared
	394	let est = DocumentContext.current.chunks.optimizeEstimate(for: project)
	395	usageLabel.stringValue = String(
	396	format: "Using %.1f of %.0f GB · this project fully optimized ≈ %.1f GB (%.1f GB built)",
	397	Double(pipeline.ledgerBytes) / 1e9, Double(pipeline.maxCacheBytes) / 1e9,
	398	Double(est.total) / 1e9, Double(est.built) / 1e9)
	399	cacheLabel.stringValue = "Cache: \(pipeline.cacheRoot.path)"
367	400	}
368	401
369	402	@objc private func fpsChanged() {
...	...	@@ -393,7 +426,14 @@ final class SettingsWindow: NSObject {
393	426	@objc private func cacheChanged() {
394	427	let gb = Int(cacheField.stringValue) ?? 50
395	428	UserDefaults.standard.set(max(1, gb), forKey: "maxCacheGB")
396		MediaPipeline.shared.evictIfNeeded()
	429	MediaPipeline.shared.evictIfNeeded(reconcile: true)
	430	sync()
	431	}
	432	@objc private func ramChanged() {
	433	let gb = Int(ramField.stringValue) ?? 2
	434	UserDefaults.standard.set(max(1, gb), forKey: "maxRAMGB")
	435	FrameCache.shared.refreshBudget()
	436	sync()
397	437	}
398	438	@objc private func revealCache() {
399	439	NSWorkspace.shared.activateFileViewerSelecting([MediaPipeline.shared.cacheRoot])

sequencer/Sources/Sequencer/Transcript.swift created+469

...	...	@@ -0,0 +1,469 @@
	1	import AppKit
	2
	3	// Clover-recorder transcript integration: when a `cam.mov` has a sibling
	4	// `transcript.json` (the format the recorder writes), the viewer shows
	5	// synchronized two-line karaoke captions over the picture.
	6	//
	7	// All transcript times are in the media's OWN (source) timebase — seconds from
	8	// the start of cam.mov — so a clip's `sourceTime(at:)` maps the playhead into
	9	// them, respecting trim (srcIn) and speed.
	10
	11	/// One spoken word with its timing (source seconds) and which segment
	12	/// (sentence) it came from — segment changes force a line break so sentences
	13	/// don't run together.
	14	struct TranscriptWord {
	15	var text: String
	16	var start: Double
	17	var end: Double
	18	var seg: Int
	19	}
	20
	21	/// A parsed clover `transcript.json`: words flattened across segments in time
	22	/// order. `key` is the file path — its identity for layout caching.
	23	struct Transcript {
	24	var words: [TranscriptWord]
	25	var key: String
	26
	27	// MARK: Decoding shapes (tolerant — unknown/missing fields are skipped)
	28
	29	private struct RawWord: Decodable { var word: String?; var start: Double?; var end: Double? }
	30	private struct RawSeg: Decodable {
	31	var start: Double?; var end: Double?; var text: String?; var words: [RawWord]?
	32	}
	33	private struct RawTranscript: Decodable { var segments: [RawSeg]? }
	34
	35	/// Parse raw JSON. Returns nil if there's nothing usable to show.
	36	static func parse(_ data: Data, key: String) -> Transcript? {
	37	guard let raw = try? JSONDecoder().decode(RawTranscript.self, from: data),
	38	let segments = raw.segments else { return nil }
	39	var words: [TranscriptWord] = []
	40	for (si, seg) in segments.enumerated() {
	41	let wordList = seg.words ?? []
	42	var added = false
	43	for rw in wordList {
	44	guard let start = rw.start else { continue }
	45	let text = (rw.word ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
	46	guard !text.isEmpty else { continue }
	47	words.append(TranscriptWord(text: text, start: start,
	48	end: max(start, rw.end ?? start), seg: si))
	49	added = true
	50	}
	51	// A segment with no per-word timing still shows as one block spanning
	52	// the segment, so nothing goes silently missing.
	53	if !added, let start = seg.start {
	54	let text = (seg.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
	55	if !text.isEmpty {
	56	words.append(TranscriptWord(text: text, start: start,
	57	end: max(start, seg.end ?? start), seg: si))
	58	}
	59	}
	60	}
	61	guard !words.isEmpty else { return nil }
	62	// Recorder output is monotonic in start time; sort defensively (stable,
	63	// so an already-sorted file keeps its segment contiguity) so the
	64	// active-word binary search below is always valid.
	65	words.sort { $0.start < $1.start }
	66	return Transcript(words: words, key: key)
	67	}
	68
	69	// MARK: Sibling-file loading (cached)
	70
	71	private static var cache: [String: Transcript?] = [:]
	72
	73	/// The transcript for a media file, or nil unless it is named `cam.mov` and
	74	/// has a readable `transcript.json` in the same folder. Cached by path so
	75	/// the per-frame visibility probe is cheap.
	76	static func load(forVideo url: URL) -> Transcript? {
	77	guard url.lastPathComponent.lowercased() == "cam.mov" else { return nil }
	78	let path = url.deletingLastPathComponent()
	79	.appendingPathComponent("transcript.json").path
	80	if let hit = cache[path] { return hit }
	81	let parsed = (try? Data(contentsOf: URL(fileURLWithPath: path)))
	82	.flatMap { parse($0, key: path) }
	83	cache[path] = parsed
	84	return parsed
	85	}
	86
	87	/// Drop cached parses so a re-imported/edited transcript is re-read.
	88	static func clearCache() { cache.removeAll() }
	89
	90	// MARK: Lookup
	91
	92	/// Index of the word active at source time `s` — the last word that has
	93	/// started. A word stays "current" until the next one begins, so there are
	94	/// no gaps. Returns -1 before the first word.
	95	func activeIndex(at s: Double) -> Int {
	96	var lo = 0, hi = words.count - 1, res = -1
	97	while lo <= hi {
	98	let mid = (lo + hi) / 2
	99	if words[mid].start <= s { res = mid; lo = mid + 1 } else { hi = mid - 1 }
	100	}
	101	return res
	102	}
	103	}
	104
	105	/// Two-line synchronized captions drawn over the viewer: white text on a black
	106	/// clipped background, the active word in magenta, always on the TOP line.
	107	/// New lines rise from the bottom and leave above the top as speech advances.
	108	///
	109	/// The whole thing is a pure function of the playhead. Nothing here uses a
	110	/// timer, Core Animation, or wall-clock tween: the vertical scroll offset is
	111	/// computed straight from the source time, so stepping frame-by-frame steps the
	112	/// animation and seeking lands with no motion (exactly what was asked for).
	113	final class SubtitleOverlay: NSView {
	114	var ctx: DocumentContext = .headless {
	115	didSet {
	116	guard oldValue !== ctx else { return }
	117	oldValue.notify.removeObserver(self, name: .playheadChanged, object: nil)
	118	ctx.notify.addObserver(self, selector: #selector(sync),
	119	name: .playheadChanged, object: nil)
	120	sync()
	121	}
	122	}
	123	private var store: Store { ctx.store }
	124	private var playback: PlaybackController { ctx.playback }
	125	private var session: SessionState { ctx.session }
	126
	127	/// The transcript being shown and the source time to render it at — both
	128	/// recomputed on every playhead move in `sync()`.
	129	private var transcript: Transcript?
	130	private var sourceTime: Double = 0
	131	/// The clip the transcript is being shown for — kept so a word click can map
	132	/// the word's source time back to a timeline moment (inverse of the scroll).
	133	private var clip: Clip?
	134
	135	/// Laid-out lines (each an array of positioned words) cached per transcript
	136	/// + box width. `lineOfWord[i]` is the line word `i` landed on.
	137	private struct LaidWord { var index: Int; var text: String; var x: CGFloat; var width: CGFloat }
	138	private var lines: [[LaidWord]] = []
	139	private var lineOfWord: [Int] = []
	140	/// Natural content width (points) of each laid-out line — drives the black
	141	/// backing that hugs the visible two lines.
	142	private var lineWidths: [CGFloat] = []
	143	private var laidKey: String?
	144	private var laidWidth: CGFloat = -1
	145
	146	/// What to mark at the current source time: a spoken word painted magenta,
	147	/// or — during a real pause between two words — a magenta caret sitting
	148	/// after the last spoken word, signalling that nothing is being said.
	149	private enum Mark { case word(Int); case caret(after: Int); case none }
	150
	151	/// Gaps up to this (seconds) hold the previous word lit instead of blinking
	152	/// off; longer gaps show the caret. Small inter-word silences are noise and
	153	/// shouldn't flicker the highlight.
	154	private static let extendGap = 0.25
	155
	156	private static let magenta = NSColor(srgbRed: 1.0, green: 0.22, blue: 0.86, alpha: 1)
	157
	158	override init(frame: NSRect) {
	159	super.init(frame: frame)
	160	wantsLayer = true
	161	layer?.backgroundColor = NSColor.clear.cgColor
	162	isHidden = true
	163	NotificationCenter.default.addObserver(self, selector: #selector(sync),
	164	name: .projectChanged, object: nil)
	165	NotificationCenter.default.addObserver(self, selector: #selector(sync),
	166	name: .viewOptionsChanged, object: nil)
	167	NotificationCenter.default.addObserver(self, selector: #selector(sync),
	168	name: .viewerNeedsRefresh, object: nil)
	169	ctx.notify.addObserver(self, selector: #selector(sync),
	170	name: .playheadChanged, object: nil)
	171	}
	172	required init?(coder: NSCoder) { fatalError() }
	173
	174	override var isFlipped: Bool { true } // y grows downward: top line at small y
	175
	176	// Swallow clicks only when they land on a word — a word click scrubs the
	177	// playhead to that word (see `mouseDown`). Clicks on the box's gaps/padding
	178	// pass through to the cell beneath so clip selection still works there.
	179	override func hitTest(_ point: NSPoint) -> NSView? {
	180	guard !isHidden, transcript != nil else { return nil }
	181	return wordIndex(atLocal: convert(point, from: superview)) != nil ? self : nil
	182	}
	183
	184	/// Scrub to the clicked word's start.
	185	override func mouseDown(with event: NSEvent) {
	186	let local = convert(event.locationInWindow, from: nil)
	187	guard let transcript, let clip,
	188	let idx = wordIndex(atLocal: local) else { return }
	189	playback.seek(to: clip.timelineTime(forSource: transcript.words[idx].start))
	190	}
	191
	192	/// The transcript word whose drawn rect contains `p` (this view's flipped,
	193	/// local coords), or nil. Mirrors `draw`'s layout so hit-testing and painting
	194	/// never disagree.
	195	private func wordIndex(atLocal p: NSPoint) -> Int? {
	196	guard transcript != nil, bounds.width > 40 else { return nil }
	197	rebuildLayoutIfNeeded()
	198	guard !lines.isEmpty else { return nil }
	199	let m = Metrics(width: bounds.width)
	200	// Only the visible two-line band is clickable (matches what's drawn).
	201	guard p.y >= m.vpad, p.y <= bounds.height - m.vpad else { return nil }
	202	let scroll = scrollLines(at: sourceTime)
	203	for (li, line) in lines.enumerated() {
	204	let topY = m.vpad + (CGFloat(li) - scroll) * m.lineH
	205	guard p.y >= topY, p.y < topY + m.lineH else { continue }
	206	for lw in line where p.x >= lw.x && p.x < lw.x + lw.width {
	207	return lw.index
	208	}
	209	}
	210	return nil
	211	}
	212
	213	// MARK: Geometry
	214
	215	/// Box metrics for a given width. Font scales gently with the box so the
	216	/// captions stay legible on small viewers without ballooning on large ones.
	217	struct Metrics {
	218	let fontSize, lineH, vpad, hpad, height: CGFloat
	219	init(width: CGFloat) {
	220	fontSize = min(26, max(14, width / 30))
	221	lineH = (fontSize * 1.32).rounded(.up)
	222	vpad = (lineH * 0.34).rounded()
	223	hpad = 16
	224	height = lineH * 2 + vpad * 2
	225	}
	226	}
	227
	228	private static func font(_ size: CGFloat) -> NSFont {
	229	.systemFont(ofSize: size, weight: .semibold)
	230	}
	231
	232	/// Where the caption box sits inside the viewer: centred horizontally, near
	233	/// the bottom. Sized only from the viewer bounds, so the parent can position
	234	/// it in `layout()` without knowing the content.
	235	func preferredFrame(in bounds: NSRect) -> NSRect {
	236	let w = min(max(bounds.width * 0.72, 260), 860)
	237	let m = Metrics(width: w)
	238	let x = ((bounds.width - w) / 2).rounded()
	239	let margin = max(16, bounds.height * 0.045)
	240	let y = max(m.vpad, (bounds.height - m.height - margin).rounded())
	241	return NSRect(x: x, y: y, width: w, height: m.height)
	242	}
	243
	244	// MARK: State
	245
	246	/// Recompute which transcript/clip is under the playhead and at what source
	247	/// time, then redraw. Hidden whenever the toggle is off or nothing under the
	248	/// playhead carries a transcript.
	249	@objc func sync() {
	250	guard session.subtitlesEnabled, let (clip, media) = transcriptClipUnderPlayhead() else {
	251	if !isHidden { isHidden = true }
	252	transcript = nil
	253	self.clip = nil
	254	return
	255	}
	256	transcript = Transcript.load(forVideo: media.url)
	257	self.clip = clip
	258	sourceTime = max(0, clip.sourceTime(at: playback.playhead))
	259	isHidden = transcript == nil
	260	needsDisplay = true
	261	}
	262
	263	/// The visible video clip under the playhead whose media is a transcript-
	264	/// bearing `cam.mov`. Mirrors the viewer's own hide/focus visibility rule;
	265	/// the Priority pane wins when it qualifies.
	266	private func transcriptClipUnderPlayhead() -> (Clip, MediaItem)? {
	267	let project = store.project
	268	let t = playback.playhead
	269	let focusActive = !session.focusedTracks.isEmpty \|\| session.fusionFocus
	270	func visible(_ ref: TrackRef) -> Bool {
	271	focusActive ? session.focusedTracks.contains(ref)
	272	: !session.hiddenTracks.contains(ref)
	273	}
	274	var found: (TrackRef, Clip, MediaItem)?
	275	for ref in project.laneRefs where visible(ref) {
	276	guard let clip = project.clipAt(track: ref, time: t, kind: .video),
	277	let m = project.media(clip.mediaId),
	278	Transcript.load(forVideo: m.url) != nil else { continue }
	279	if ref == session.priorityPane { return (clip, m) }
	280	if found == nil { found = (ref, clip, m) }
	281	}
	282	return found.map { ($0.1, $0.2) }
	283	}
	284
	285	// MARK: Layout
	286
	287	/// Wrap the transcript into center-aligned lines that fit the box, breaking
	288	/// at segment (sentence) boundaries. Cached until the box width or the
	289	/// transcript changes.
	290	private func rebuildLayoutIfNeeded() {
	291	guard let transcript else { lines = []; lineOfWord = []; lineWidths = []; return }
	292	let m = Metrics(width: bounds.width)
	293	if laidKey == transcript.key && abs(laidWidth - bounds.width) < 0.5 { return }
	294	laidKey = transcript.key
	295	laidWidth = bounds.width
	296
	297	let font = Self.font(m.fontSize)
	298	let attrs: [NSAttributedString.Key: Any] = [.font: font]
	299	func measure(_ s: String) -> CGFloat { (s as NSString).size(withAttributes: attrs).width }
	300	let space = measure(" ")
	301	let maxW = bounds.width - m.hpad * 2
	302
	303	var built: [[LaidWord]] = []
	304	var widths: [CGFloat] = []
	305	var lineIdx = [Int](repeating: 0, count: transcript.words.count)
	306	var cur: [LaidWord] = []
	307	var penX: CGFloat = 0
	308
	309	func flush() {
	310	guard !cur.isEmpty else { return }
	311	let lineW = (cur.last?.x ?? 0) + (cur.last?.width ?? 0)
	312	let off = (m.hpad + max(0, (maxW - lineW) / 2)).rounded()
	313	built.append(cur.map { LaidWord(index: $0.index, text: $0.text,
	314	x: $0.x + off, width: $0.width) })
	315	widths.append(lineW)
	316	cur = []
	317	penX = 0
	318	}
	319
	320	for (gi, w) in transcript.words.enumerated() {
	321	let width = measure(w.text)
	322	let newSegment = gi > 0 && w.seg != transcript.words[gi - 1].seg
	323	let x = cur.isEmpty ? 0 : penX + space
	324	if newSegment \|\| (!cur.isEmpty && x + width > maxW) {
	325	flush()
	326	}
	327	let placeX = cur.isEmpty ? 0 : penX + space
	328	cur.append(LaidWord(index: gi, text: w.text, x: placeX, width: width))
	329	penX = placeX + width
	330	lineIdx[gi] = built.count // the line this word will land on once flushed
	331	}
	332	flush()
	333	lines = built
	334	lineOfWord = lineIdx
	335	lineWidths = widths
	336	}
	337
	338	/// Content width (points) to draw the black backing at for a given vertical
	339	/// scroll. At rest on line `k` this is the wider of the two visible lines
	340	/// (`k` and `k+1`); mid-slide it blends the outgoing and incoming pairs, so
	341	/// the box width eases in lockstep with the scroll — same playhead-driven,
	342	/// frame-steppable motion, no Core Animation.
	343	private func contentWidth(atScroll s: CGFloat) -> CGFloat {
	344	guard !lineWidths.isEmpty else { return 0 }
	345	func pair(_ k: Int) -> CGFloat {
	346	let a = (k >= 0 && k < lineWidths.count) ? lineWidths[k] : 0
	347	let b = (k + 1 >= 0 && k + 1 < lineWidths.count) ? lineWidths[k + 1] : 0
	348	return max(a, b)
	349	}
	350	let k = Int(s.rounded(.down))
	351	let f = s - CGFloat(k)
	352	return pair(k) + (pair(k + 1) - pair(k)) * f
	353	}
	354
	355	/// Continuous vertical scroll, in line units, as a pure function of source
	356	/// time. Holds on the active word's line, then slides up over ~0.3s when a
	357	/// new line begins — so the focused word slides into the top row and stays
	358	/// there. Interpolating over time (not a CA animation) is what makes it
	359	/// frame-steppable and animation-free on a seek.
	360	private func scrollLines(at s: Double) -> CGFloat {
	361	guard let transcript, !lineOfWord.isEmpty else { return 0 }
	362	let i = transcript.activeIndex(at: s)
	363	guard i >= 0 else { return 0 }
	364	let cur = lineOfWord[i]
	365	let prev = i > 0 ? lineOfWord[i - 1] : cur
	366	if cur == prev { return CGFloat(cur) }
	367	let startI = transcript.words[i].start
	368	let nextStart = i + 1 < transcript.words.count
	369	? transcript.words[i + 1].start : transcript.words[i].end
	370	let slide = min(0.30, max(0.0001, nextStart - startI))
	371	let t = min(1, max(0, (s - startI) / slide))
	372	let e = t * t * (3 - 2 * t) // smoothstep
	373	return CGFloat(prev) + (CGFloat(cur) - CGFloat(prev)) * e
	374	}
	375
	376	/// Resolve what to highlight at source time `s`. While a word is being
	377	/// spoken it lights up. In the gap after it: a small gap holds the word lit
	378	/// right up to the next one (so brief silences don't flicker); a longer gap
	379	/// shows a caret between the two words, marking the pause. Trailing silence
	380	/// after the final word fades to nothing.
	381	private func mark(at s: Double) -> Mark {
	382	guard let transcript else { return .none }
	383	let i = transcript.activeIndex(at: s)
	384	guard i >= 0 else { return .none }
	385	let w = transcript.words[i]
	386	if s <= w.end { return .word(i) } // still being spoken
	387	if i + 1 < transcript.words.count {
	388	let gap = transcript.words[i + 1].start - w.end
	389	return gap <= Self.extendGap ? .word(i) // tiny gap: extend it
	390	: .caret(after: i) // real pause: caret
	391	}
	392	return s <= w.end + 0.05 ? .word(i) : .none // trailing silence
	393	}
	394
	395	// MARK: Draw
	396
	397	override func draw(_ dirty: NSRect) {
	398	guard transcript != nil, bounds.width > 40 else { return }
	399	rebuildLayoutIfNeeded()
	400	guard !lines.isEmpty else { return }
	401	let m = Metrics(width: bounds.width)
	402
	403	let font = Self.font(m.fontSize)
	404	let scroll = scrollLines(at: sourceTime)
	405	let markResult = mark(at: sourceTime)
	406	var highlight = -1
	407	if case .word(let idx) = markResult { highlight = idx }
	408
	409	// Black rounded backing, sized to hug the two visible lines and centred
	410	// in the (fixed, transparent) container — width eases with the scroll.
	411	let boxW = min(bounds.width, (contentWidth(atScroll: scroll) + m.hpad * 2).rounded())
	412	let boxX = ((bounds.width - boxW) / 2).rounded()
	413	let boxRect = NSRect(x: boxX, y: 0, width: boxW, height: bounds.height)
	414	let bg = NSBezierPath(roundedRect: boxRect, xRadius: 10, yRadius: 10)
	415	NSColor(calibratedWhite: 0, alpha: 0.8).setFill()
	416	bg.fill()
	417	NSGraphicsContext.saveGraphicsState()
	418	bg.addClip()
	419	// Clip text to the inner TWO-line band (inset by the vertical padding),
	420	// not the full padded box. This is what keeps the focused word pinned to
	421	// the top line: without it, a settled neighbour line's descenders bleed
	422	// into the top/bottom padding and the active line reads as the 2nd row.
	423	// Lines still animate through this band — they're simply cut off cleanly
	424	// at its top/bottom edges as they rise away / come up from below. The
	425	// rounded-box clip above also trims lines sliding through a narrower box.
	426	NSBezierPath(rect: NSRect(x: 0, y: m.vpad,
	427	width: bounds.width,
	428	height: bounds.height - m.vpad * 2)).addClip()
	429
	430	// Vertical inset so the glyphs sit centred in their line box.
	431	let glyphH = font.ascender - font.descender
	432	let textInset = ((m.lineH - glyphH) / 2).rounded()
	433
	434	// A caret (magenta cursor) sits just after the last spoken word during a
	435	// real pause. Resolve its line/x from that word's laid-out position.
	436	var caretLine = -1
	437	var caretX: CGFloat = 0
	438	if case .caret(let after) = markResult, after < lineOfWord.count {
	439	let li = lineOfWord[after]
	440	if li < lines.count, let prev = lines[li].first(where: { $0.index == after }) {
	441	caretLine = li
	442	let rightEdge = prev.x + prev.width
	443	// Centre the caret in the gap to the next word when it shares
	444	// this line; if the next word wrapped away, sit just past this one.
	445	if let next = lines[li].first(where: { $0.index == after + 1 }) {
	446	caretX = ((rightEdge + next.x) / 2).rounded()
	447	} else {
	448	caretX = (rightEdge + 3).rounded()
	449	}
	450	}
	451	}
	452
	453	for (li, line) in lines.enumerated() {
	454	let topY = m.vpad + (CGFloat(li) - scroll) * m.lineH
	455	if topY > bounds.height \|\| topY + m.lineH < 0 { continue } // fully clipped
	456	let baselineY = topY + textInset
	457	for lw in line {
	458	let color = lw.index == highlight ? Self.magenta : NSColor.white
	459	let attrs: [NSAttributedString.Key: Any] = [.font: font, .foregroundColor: color]
	460	(lw.text as NSString).draw(at: NSPoint(x: lw.x, y: baselineY), withAttributes: attrs)
	461	}
	462	if li == caretLine {
	463	Self.magenta.setFill()
	464	NSBezierPath(rect: NSRect(x: caretX - 1, y: baselineY, width: 2, height: glyphH)).fill()
	465	}
	466	}
	467	NSGraphicsContext.restoreGraphicsState()
	468	}
	469	}

sequencer/Sources/Sequencer/TransportBar.swift+25-2

...	...	@@ -90,6 +90,7 @@ final class TransportBar: NSView {
90	90	private let shapesButton = InstantButton(title: "", target: nil, action: nil)
91	91	private let colorSwatch = InstantButton(title: "", target: nil, action: nil)
92	92	private let snapButton = InstantButton(title: "", target: nil, action: nil)
	93	private let subtitleButton = InstantButton(title: "", target: nil, action: nil)
93	94	private let filmstripButton = InstantButton(title: "", target: nil, action: nil)
94	95	private let viewerButton = InstantButton(title: "", target: nil, action: nil)
95	96
...	...	@@ -237,6 +238,11 @@ final class TransportBar: NSView {
237	238	snapButton.target = self
238	239	snapButton.action = #selector(toggleSnap)
239	240	styleIconButton(snapButton, tip: "Snap (Y)")
	241	subtitleButton.image = NSImage(systemSymbolName: "captions.bubble",
	242	accessibilityDescription: "subtitles")
	243	subtitleButton.target = self
	244	subtitleButton.action = #selector(toggleSubtitles)
	245	styleIconButton(subtitleButton, tip: "Subtitles")
240	246	filmstripButton.image = NSImage(systemSymbolName: "film",
241	247	accessibilityDescription: "clip thumbnails")
242	248	filmstripButton.target = self
...	...	@@ -257,8 +263,8 @@ final class TransportBar: NSView {
257	263	heightSlider.toolTip = "Track height (⌥⌘= / ⌥⌘- / ⌥⌘0)"
258	264	heightSlider.widthAnchor.constraint(equalToConstant: 80).isActive = true
259	265
260		let rightStack = NSStackView(views: [netWarn, jobs, snapButton, filmstripButton,
261		viewerButton, heightSlider])
	266	let rightStack = NSStackView(views: [netWarn, jobs, snapButton, subtitleButton,
	267	filmstripButton, viewerButton, heightSlider])
262	268	rightStack.orientation = .horizontal
263	269	rightStack.spacing = 4
264	270	rightStack.setCustomSpacing(8, after: netWarn)
...	...	@@ -390,6 +396,7 @@ final class TransportBar: NSView {
390	396	}
391	397
392	398	@objc private func toggleSnap() { session.snapping.toggle() }
	399	@objc private func toggleSubtitles() { session.subtitlesEnabled.toggle() }
393	400	@objc private func toggleFilmstrips() { session.showFilmstrips.toggle() }
394	401
395	402	@objc private func viewerClicked() {
...	...	@@ -614,6 +621,7 @@ final class TransportBar: NSView {
614	621	shapesButton.alphaValue = canDraw ? 1 : 0.3
615	622	colorSwatch.layer?.backgroundColor = session.drawColor.cgColor
616	623	highlight(snapButton, session.snapping)
	624	highlight(subtitleButton, session.subtitlesEnabled)
617	625	highlight(filmstripButton, session.showFilmstrips)
618	626	highlight(viewerButton, session.previewsOnLeft
619	627	\|\| ((window?.windowController as? SequencerWindowController)?.previewsArePopped ?? false))
...	...	@@ -667,6 +675,21 @@ final class TransportBar: NSView {
667	675	jobs.textColor = Theme.subtleLabel
668	676	jobs.stringValue = "⏸ \(total) chunk\(total == 1 ? "" : "s")"
669	677	jobs.toolTip = "When paused, clip optimization happens only during playback."
	678	} else if chunks.budgetStarved {
	679	// The cache is at its cap and the project is bigger than it: the
	680	// builder is deliberately NOT trying to finish the queue — it
	681	// maintains a working set around where you play and edit. Say so,
	682	// instead of dangling a queue count that will never drain.
	683	jobs.textColor = Theme.subtleLabel
	684	jobs.stringValue = building > 0
	685	? "cache full — optimizing \(building) near playhead"
	686	: "cache full — optimizing on demand"
	687	let gb = Double(MediaPipeline.shared.maxCacheBytes) / 1e9
	688	jobs.toolTip = String(format:
	689	"The proxy cache is at its %.0f GB cap, so this project can't be "
	690	+ "fully optimized at once. Proxies are kept where you play, edit, "
	691	+ "and land on clips, and rebuilt on demand elsewhere. Raise the "
	692	+ "cap in Settings to fit more. Click to pause optimization.", gb)
670	693	} else if queued == 0 {
671	694	jobs.textColor = .systemOrange
672	695	jobs.stringValue = "optimizing \(building) chunk\(building == 1 ? "" : "s")"

sequencer/Sources/Sequencer/UITest.swift+46-1

...	...	@@ -37,7 +37,8 @@ func runUITest() {
37	37
38	38	// Coordinate helpers mirroring the view's layout constants.
39	39	func x(_ sec: Double) -> CGFloat { timeline.testXFor(sec) }
40		func laneY(_ row: Int) -> CGFloat { 26 + CGFloat(row) * (64 + 4) + 4 + 32 } // lane mid
	40	// lane mid: ruler (26) + optimization strip (5) + row offset
	41	func laneY(_ row: Int) -> CGFloat { 26 + 5 + CGFloat(row) * (64 + 4) + 4 + 32 }
41	42	// NSEvent locationInWindow is bottom-left origin; view is flipped & fills window.
42	43	func winPoint(_ vx: CGFloat, _ vy: CGFloat) -> NSPoint { NSPoint(x: vx, y: 400 - vy) }
43	44
...	...	@@ -487,6 +488,16 @@ func runUITest() {
487	488	let top = lum(comp27, 0.5, 0.15), bottom = lum(comp27, 0.5, 0.85)
488	489	check(top >= 0 && top < 0.5 && bottom > 0.9,
489	490	"stroke drawn at top STAYS at top (top=\(top), bottom=\(bottom))")
	491
	492	// 27e. The stroke rides the SHARED undo timeline: ⌘Z clears the drawing,
	493	// ⌘⇧Z brings it back — no separate raster-undo lane.
	494	store.undo()
	495	let undone = lum(DocumentContext.headless.boards.composite(for: board27), 0.5, 0.15)
	496	store.redo()
	497	let redone = lum(DocumentContext.headless.boards.composite(for: board27), 0.5, 0.15)
	498	check(undone > 0.9 && redone < 0.5,
	499	"raster stroke undoes and redoes on the shared undo timeline "
	500	+ "(drawn=\(top) undone=\(undone) redone=\(redone))")
490	501	DocumentContext.headless.boards.saveRaster(nil, boardId: board27.id)
491	502
492	503	// 28. Overlaps ignore audio (layering is allowed).
...	...	@@ -597,6 +608,40 @@ func runUITest() {
597	608	check(lcs.count == 2 && abs(lcs[1].start - 20) < 1e-6 && abs(lcs[1].duration - 15) < 1e-6,
598	609	"⌥← ripple-trims the left side to the playhead")
599	610
	611	// 31d-ripple. ⌥-drag a clip's IN edge = ripple trim: the clip's start stays
	612	// pinned, its in-point re-trims, and the follower shifts to stay gapless.
	613	// Media out-point is fixed, so the source range only loses (or regains)
	614	// frames at the head.
	615	var mri = ProjectModel(); mri.fps = 30; mri.media = [media]
	616	mri.tracks = [Track(hue: 0.6)]
	617	let ra = Clip(mediaId: media.id, track: .video(0), start: 20, srcIn: 10, duration: 20)
	618	let rb = Clip(mediaId: media.id, track: .video(0), start: 40, srcIn: 0, duration: 20)
	619	mri.clips = [ra, rb]
	620	store.replaceForTest(mri)
	621	store.selection = []
	622	DocumentContext.headless.session.snapping = false
	623	timeline.zoomToFit()
	624	// Drag ra's in edge right by 10s: trim the head, pull rb in with it.
	625	drag(from: winPoint(x(20) + 3, laneY(0)), to: winPoint(x(30) + 3, laneY(0)), flags: [.option])
	626	let ra1 = clip(ra.id)!, rb1 = clip(rb.id)!
	627	check(abs(ra1.start - 20) < 1e-6 && abs(ra1.srcIn - 20) < 0.5
	628	&& abs(ra1.duration - 10) < 0.5 && abs(rb1.start - 30) < 0.5,
	629	"⌥ in-edge ripple: start pinned, head trimmed, follower pulled in "
	630	+ "(got start \(ra1.start), srcIn \(ra1.srcIn), dur \(ra1.duration), rb \(rb1.start))")
	631	check(abs((ra1.srcIn + ra1.duration) - (ra.srcIn + ra.duration)) < 0.5,
	632	"⌥ in-edge ripple keeps the source out-point fixed")
	633	store.undo()
	634	check(abs(clip(ra.id)!.srcIn - 10) < 1e-6 && abs(clip(rb.id)!.start - 40) < 1e-6,
	635	"⌥ in-edge ripple undoes as one step")
	636	// Drag left by 10s: extend the head, push the follower out.
	637	drag(from: winPoint(x(20) + 3, laneY(0)), to: winPoint(x(10) + 3, laneY(0)), flags: [.option])
	638	let ra2 = clip(ra.id)!, rb2 = clip(rb.id)!
	639	check(abs(ra2.start - 20) < 1e-6 && abs(ra2.srcIn - 0) < 0.5
	640	&& abs(ra2.duration - 30) < 0.5 && abs(rb2.start - 50) < 0.5,
	641	"⌥ in-edge ripple (drag left): head extended, follower pushed out "
	642	+ "(got start \(ra2.start), srcIn \(ra2.srcIn), dur \(ra2.duration), rb \(rb2.start))")
	643	store.undo()
	644
600	645	// 31e. Delete-the-space closes a blank gap at the playhead.
601	646	var mb = ProjectModel(); mb.fps = 30; mb.media = [media]
602	647	mb.tracks = [Track(hue: 0.4)]

sequencer/Sources/Sequencer/ViewerGridView.swift+121-15

...	...	@@ -20,6 +20,7 @@ final class ViewerGridView: NSView {
20	20	// and render nothing but the black cell background.
21	21	for c in cells.values { c.ctx = ctx }
22	22	fusionCell?.ctx = ctx
	23	subtitles.ctx = ctx
23	24	}
24	25	}
25	26	private var store: Store { ctx.store }
...	...	@@ -46,6 +47,11 @@ final class ViewerGridView: NSView {
46	47	/// one-click way back). Only shown when there are no panes at all.
47	48	private let placeholder = ViewerPlaceholder()
48	49
	50	/// Synchronized clover-transcript captions, drawn on top of the cells.
	51	/// Positions itself (via `preferredFrame`) but hides itself unless a
	52	/// transcript-bearing clip is under the playhead and captions are enabled.
	53	private let subtitles = SubtitleOverlay()
	54
49	55	override init(frame: NSRect) {
50	56	super.init(frame: frame)
51	57	wantsLayer = true
...	...	@@ -76,6 +82,11 @@ final class ViewerGridView: NSView {
76	82	placeholder.leadingAnchor.constraint(greaterThanOrEqualTo: leadingAnchor, constant: 16),
77	83	placeholder.trailingAnchor.constraint(lessThanOrEqualTo: trailingAnchor, constant: -16),
78	84	])
	85	// Captions ride on top of the cells. Added last so later cells (inserted
	86	// `.below`) stay under it; positioned in `layout()`.
	87	subtitles.ctx = ctx
	88	addSubview(subtitles)
	89
79	90	// Dropping media anywhere in the empty viewer imports it (delegating to
80	91	// the timeline's importer), so the "Drag files…" prompt is real.
81	92	registerForDraggedTypes([.fileURL])
...	...	@@ -304,6 +315,12 @@ final class ViewerGridView: NSView {
304	315	override func layout() {
305	316	super.layout()
306	317	applyFrames(animated: false, appearing: [])
	318	// Keep the caption box centred near the bottom and above every cell.
	319	subtitles.frame = subtitles.preferredFrame(in: bounds)
	320	if subviews.last !== subtitles {
	321	subtitles.removeFromSuperview()
	322	addSubview(subtitles)
	323	}
307	324	}
308	325
309	326	/// Lay out the panes and animate them into place. Normally a justified-rows
...	...	@@ -967,11 +984,33 @@ final class ViewerCell: ViewerCellBase {
967	984	/// those flash; instead we wait out a short grace period and only reveal it
968	985	/// if the cell is still empty. Any resolved frame cancels it.
969	986	private var pendingSpinner: DispatchWorkItem?
970		private func scheduleLoadingOverlay() {
971		guard !overlayVisible, pendingSpinner == nil else { return }
	987	private var overlayText: String?
	988
	989	// Miss metrics: every spinner that actually shows is one recorded "miss",
	990	// logged with a diagnosis of WHY the frame wasn't ready (see
	991	// ChunkManager.missDiagnosis) and, on recovery, how long it lasted —
	992	// so "I saw the loading screen" is answerable from the log.
	993	private static var missCount = 0
	994	private static var missSeconds = 0.0
	995	private var missStart: Date?
	996
	997	private func scheduleLoadingOverlay(media: MediaItem?, clip: Clip?) {
	998	guard overlayText == nil, pendingSpinner == nil else { return }
972	999	let work = DispatchWorkItem { [weak self] in
973		self?.pendingSpinner = nil
974		self?.showLoadingOverlay(true)
	1000	guard let self else { return }
	1001	self.pendingSpinner = nil
	1002	self.showOverlay("Loading Media…", spinning: true)
	1003	self.missStart = Date()
	1004	Self.missCount += 1
	1005	if let media, let clip {
	1006	let src = max(0, clip.sourceTime(at: self.playback.playhead))
	1007	SeqLog.log("[miss] spinner ON %@ src=%.1f %@ (miss #%d)",
	1008	media.displayName, src,
	1009	self.chunks.missDiagnosis(media: media, sourceTime: src),
	1010	Self.missCount)
	1011	} else {
	1012	SeqLog.log("[miss] spinner ON (no clip resolved) (miss #%d)", Self.missCount)
	1013	}
975	1014	}
976	1015	pendingSpinner = work
977	1016	DispatchQueue.main.asyncAfter(deadline: .now() + 0.25, execute: work)
...	...	@@ -979,15 +1018,38 @@ final class ViewerCell: ViewerCellBase {
979	1018	private func cancelLoadingOverlay() {
980	1019	pendingSpinner?.cancel()
981	1020	pendingSpinner = nil
982		showLoadingOverlay(false)
983		}
984
985		private func showLoadingOverlay(_ show: Bool) {
986		if show { layoutOverlay(in: bounds) }
987		guard overlayVisible != show else { return }
988		overlayVisible = show
989		overlayBg.isHidden = !show
990		if show {
	1021	if let start = missStart {
	1022	missStart = nil
	1023	let d = Date().timeIntervalSince(start)
	1024	Self.missSeconds += d
	1025	SeqLog.log("[miss] spinner OFF after %.1fs (session: %d misses, %.0fs total)",
	1026	d, Self.missCount, Self.missSeconds)
	1027	}
	1028	hideOverlay()
	1029	}
	1030
	1031	/// A persistent (non-transient) overlay — media offline / failed to decode.
	1032	/// No debounce and no spinner: it's a steady state, not a "wait a moment."
	1033	private func showStateOverlay(_ text: String) {
	1034	pendingSpinner?.cancel(); pendingSpinner = nil
	1035	if let start = missStart { // spinner resolved INTO a steady state
	1036	missStart = nil
	1037	let d = Date().timeIntervalSince(start)
	1038	Self.missSeconds += d
	1039	SeqLog.log("[miss] spinner OFF after %.1fs → %@", d, text)
	1040	}
	1041	showOverlay(text, spinning: false)
	1042	}
	1043
	1044	private func showOverlay(_ text: String, spinning: Bool) {
	1045	guard overlayText != text else { return } // already showing this
	1046	overlayText = text
	1047	overlayVisible = true
	1048	layoutOverlay(in: bounds)
	1049	loadingText.string = text
	1050	spinnerLayer.isHidden = !spinning
	1051	overlayBg.isHidden = false
	1052	if spinning {
991	1053	if spinnerLayer.animation(forKey: "spin") == nil {
992	1054	let a = CABasicAnimation(keyPath: "transform.rotation.z")
993	1055	a.fromValue = 0
...	...	@@ -1000,6 +1062,13 @@ final class ViewerCell: ViewerCellBase {
1000	1062	spinnerLayer.removeAnimation(forKey: "spin")
1001	1063	}
1002	1064	}
	1065	private func hideOverlay() {
	1066	guard overlayText != nil else { return }
	1067	overlayText = nil
	1068	overlayVisible = false
	1069	overlayBg.isHidden = true
	1070	spinnerLayer.removeAnimation(forKey: "spin")
	1071	}
1003	1072
1004	1073	private var currentClipId: UUID?
1005	1074
...	...	@@ -1285,17 +1354,54 @@ final class ViewerCell: ViewerCellBase {
1285	1354	&& frontLayer.isReadyForDisplay
1286	1355	&& onTime
1287	1356	var status = covered ? "" : "processing…"
	1357	if !itemOK {
	1358	// The player can't show this moment yet: start decoding the real
	1359	// frame into the RAM cache now (from a chunk, rescue slice, or
	1360	// playable original) so the next update can stand in with it —
	1361	// exact where the filmstrip is a 240px thumb. Self-deduping.
	1362	FrameCache.shared.warm(mediaKey: media.cacheKey, at: src,
	1363	source: chunks.frameSource(media: media, sourceTime: src))
	1364	}
1288	1365	if itemOK {
1289	1366	frontLayer.isHidden = false
1290	1367	imageLayer.isHidden = true
1291	1368	cancelLoadingOverlay()
	1369	} else if let frame = FrameCache.shared.image(media: media, at: src) {
	1370	// The RAM frame cache has the exact (full-quality) frame for this
	1371	// moment — a warmed cut boundary, or a stand-in decoded on demand
	1372	// below. Better than the 240px filmstrip thumb, and it makes the
	1373	// hold across an item swap invisible.
	1374	frontLayer.isHidden = true
	1375	imageLayer.isHidden = false
	1376	imageLayer.contents = frame
	1377	cancelLoadingOverlay()
	1378	if MediaPipeline.shared.isOffline(media) { status = "offline" }
1292	1379	} else if let strip = MediaPipeline.shared.filmstripImage(for: media, at: src) {
1293	1380	// A filmstrip is a real frame for this moment: stand in with it so
1294		// the transition is filmstrip → video, never black.
	1381	// the transition is filmstrip → video, never black. If the original
	1382	// is offline the cached strip still previews, but flag it in the
	1383	// corner so it's clear playback/export won't work until it's back.
1295	1384	frontLayer.isHidden = true
1296	1385	imageLayer.isHidden = false
1297	1386	imageLayer.contents = strip
1298	1387	cancelLoadingOverlay()
	1388	if MediaPipeline.shared.isOffline(media) { status = "offline" }
	1389	} else if MediaPipeline.shared.isOffline(media) {
	1390	// The original file is gone (unmounted NAS / moved). Don't imply it's
	1391	// loading — say so plainly, and don't spin forever.
	1392	frontLayer.isHidden = true
	1393	imageLayer.isHidden = true
	1394	imageLayer.contents = nil
	1395	showStateOverlay("Media Offline")
	1396	status = "offline"
	1397	} else if chunks.buildFailed(media: media, sourceTime: src) {
	1398	// The proxy chunk hard-failed and the original isn't playable — this
	1399	// frame genuinely can't be shown; surface it instead of spinning.
	1400	frontLayer.isHidden = true
	1401	imageLayer.isHidden = true
	1402	imageLayer.contents = nil
	1403	showStateOverlay("Can't Decode")
	1404	status = "failed"
1299	1405	} else {
1300	1406	// No live video AND no stand-in. This is usually just a transient
1301	1407	// (an item swap or a seek that lands within a few frames), so do
...	...	@@ -1303,7 +1409,7 @@ final class ViewerCell: ViewerCellBase {
1303	1409	// on screen and only escalate to the framed "Loading Media…"
1304	1410	// overlay if the empty state actually persists (see
1305	1411	// scheduleLoadingOverlay). That kills the paused spinner flashes.
1306		scheduleLoadingOverlay()
	1412	scheduleLoadingOverlay(media: media, clip: clip)
1307	1413	status = ""
1308	1414	}
1309	1415	setStatus(status)

sequencer/Sources/Sequencer/WindowController.swift+16-6

...	...	@@ -167,11 +167,23 @@ final class SequencerWindowController: NSWindowController, NSWindowDelegate,
167	167	}
168	168	}
169	169
	170	/// This project became frontmost — now (and only now) kick the whole-project
	171	/// proxy pre-build so scrubbing anywhere is smooth. Deferring the fill to here
	172	/// rather than document load is what stops state-restored background projects
	173	/// from all transcoding their full proxy sets at once and overflowing the
	174	/// shared cache (see DocumentContext.startServices). `ensure` is idempotent —
	175	/// already-built chunks are skipped — so re-focusing a project is essentially
	176	/// free. Ignore the popout window becoming main (it shares this ctx).
	177	func windowDidBecomeMain(_ notification: Notification) {
	178	guard (notification.object as? NSWindow) === window else { return }
	179	ctx.chunks.ensure(for: ctx.store.project)
	180	}
	181
170	182	// MARK: - Menu validation (per-document items)
171	183
172	184	func validateMenuItem(_ menuItem: NSMenuItem) -> Bool {
173	185	switch menuItem.action {
174		case #selector(undo): return store.canUndo \|\| StoryboardEditor.shared.canUndoRaster
	186	case #selector(undo): return store.canUndo
175	187	case #selector(redo): return store.canRedo
176	188	case #selector(deleteSelected), #selector(rippleDeleteSelected):
177	189	return !store.selection.isEmpty
...	...	@@ -211,11 +223,9 @@ final class SequencerWindowController: NSWindowController, NSWindowDelegate,
211	223
212	224	// MARK: - Edit / Clip actions
213	225
214		@objc func undo() {
215		if StoryboardEditor.shared.undoRasterIfKey() { return }
216		if session.mainTool.isDraw, ctx.boards.undoLastStroke() { return }
217		store.undo()
218		}
	226	// Drawing edits now live on the same undo timeline as model edits, so ⌘Z /
	227	// ⌘⇧Z route through the Store regardless of which window is focused.
	228	@objc func undo() { store.undo() }
219	229	@objc func redo() { store.redo() }
220	230	@objc func deselectAll() {
221	231	store.selection = []

sequencer/Sources/Sequencer/main.swift+43

...	...	@@ -6,16 +6,59 @@ if CommandLine.arguments.count >= 3, CommandLine.arguments[1] == "--selftest" {
6	6	exit(0)
7	7	}
8	8
	9	// Headless cache-budget test: sequencer --cachetest <file.sq> [capGB]
	10	if CommandLine.arguments.count >= 3, CommandLine.arguments[1] == "--cachetest" {
	11	let cap = CommandLine.arguments.count >= 4 ? Int(CommandLine.arguments[3]) ?? 0 : 0
	12	runCacheTest(path: CommandLine.arguments[2], capGB: cap)
	13	exit(0)
	14	}
	15
9	16	if CommandLine.arguments.contains("--uitest") {
10	17	_ = NSApplication.shared // AppKit needs an app instance for views/windows
11	18	MainActor.assumeIsolated { runUITest() }
12	19	}
13	20
	21	// Diagnostic: bare AVPlayerLayer window on a stitched composition, using the
	22	// app's own bundle/signing — isolates layer rendering from the app machinery.
	23	if CommandLine.arguments.count >= 3, CommandLine.arguments[1] == "--layertest" {
	24	let app = NSApplication.shared
	25	app.setActivationPolicy(.regular)
	26	MainActor.assumeIsolated {
	27	runLayerTest(specs: Array(CommandLine.arguments.dropFirst(2)))
	28	}
	29	app.run()
	30	}
	31
14	32	if CommandLine.arguments.count >= 3, CommandLine.arguments[1] == "--perftest" {
15	33	_ = NSApplication.shared
16	34	MainActor.assumeIsolated { runPerfTest(path: CommandLine.arguments[2]) }
17	35	}
18	36
	37	// pkill/SIGTERM (run.sh does one per rebuild) must also take the ffmpeg
	38	// children down — the default handler kills only this process, minting the
	39	// orphan encoders that exhaust VideoToolbox and black out the next launch.
	40	// A background queue, NOT main: a wedged main thread must not make the app
	41	// unkillable (pkill looked ignored while main was frozen).
	42	signal(SIGTERM, SIG_IGN)
	43	signal(SIGINT, SIG_IGN)
	44	let signalQueue = DispatchQueue(label: "sequencer.signals", qos: .userInteractive)
	45	let termSource = DispatchSource.makeSignalSource(signal: SIGTERM, queue: signalQueue)
	46	let intSource = DispatchSource.makeSignalSource(signal: SIGINT, queue: signalQueue)
	47	for src in [termSource, intSource] {
	48	src.setEventHandler {
	49	MediaPipeline.terminateChildren()
	50	exit(0)
	51	}
	52	src.resume()
	53	}
	54
	55	HangMonitor.start()
	56	// SEQ_HANGTEST=1: deliberately stall the main thread once, to verify the
	57	// watchdog end-to-end (a [hang] line with this frame should hit the log).
	58	if ProcessInfo.processInfo.environment["SEQ_HANGTEST"] != nil {
	59	DispatchQueue.main.asyncAfter(deadline: .now() + 2) { hangTestStall() }
	60	}
	61
19	62	let app = SeqApplication.shared
20	63	let delegate = AppDelegate()
21	64	app.delegate = delegate

sequencer/build.sh+3-3

...	...	@@ -81,7 +81,7 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
81	81	<key>CFBundleExecutable</key>
82	82	<string>Sequencer</string>
83	83	<key>CFBundleIdentifier</key>
84		<string>com.clover.Sequencer</string>
	84	<string>net.paperclover.Sequencer</string>
85	85	<key>CFBundlePackageType</key>
86	86	<string>APPL</string>
87	87	<key>CFBundleShortVersionString</key>
...	...	@@ -109,7 +109,7 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
109	109	<string>Sequencer.ProjectDocument</string>
110	110	<key>LSItemContentTypes</key>
111	111	<array>
112		<string>com.clover.sequencer.project</string>
	112	<string>net.paperclover.sequencer.project</string>
113	113	</array>
114	114	<key>CFBundleTypeExtensions</key>
115	115	<array>
...	...	@@ -121,7 +121,7 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
121	121	<array>
122	122	<dict>
123	123	<key>UTTypeIdentifier</key>
124		<string>com.clover.sequencer.project</string>
	124	<string>net.paperclover.sequencer.project</string>
125	125	<key>UTTypeDescription</key>
126	126	<string>Sequencer Project</string>
127	127	<key>UTTypeConformsTo</key>

sequencer/run.sh+13-2

...	...	@@ -1,8 +1,19 @@
1	1	#!/bin/sh
	2	# Build and relaunch the app. Ships the RELEASE binary — the timeline is
	3	# measurably 4× slower under -Onone, so the app people actually run must be
	4	# optimized. Pass --debug to ship the debug build (e.g. when chasing a crash
	5	# with full assertions/symbols).
2	6	set -e
3	7	cd "$(dirname "$0")"
4		swift build
	8	CONF=release
	9	[ "$1" = "--debug" ] && CONF=debug
	10	swift build -c "$CONF"
5	11	pkill -x Sequencer 2>/dev/null \|\| true
6		cp .build/debug/Sequencer Sequencer.app/Contents/MacOS/Sequencer
	12	# The app terminates its ffmpeg children on SIGTERM, but sweep any strays from
	13	# older builds anyway — orphaned encoders exhaust the shared VideoToolbox
	14	# session pool and the next launch's players silently render black.
	15	sleep 1
	16	pkill -9 -f "Library/Caches/Sequencer" 2>/dev/null \|\| true
	17	cp ".build/$CONF/Sequencer" Sequencer.app/Contents/MacOS/Sequencer
7	18	codesign --force --deep --sign "Sequencer Dev" Sequencer.app
8	19	open Sequencer.app