| 1 | import Foundation |
| 2 | |
| 3 | /// A recorder `sync.json` manifest. Each stream names a file and carries the |
| 4 | /// relative `offsetSeconds` (from the session's clock start) that keeps the |
| 5 | /// streams aligned. Importing the manifest (or a folder holding it, or the |
| 6 | /// media files that sit beside it) places each clip at its offset so the whole |
| 7 | /// multicam session lands in sync. |
| 8 | struct SyncManifest: Decodable { |
| 9 | struct Stream: Decodable { |
| 10 | var file: String |
| 11 | var offsetSeconds: Double? |
| 12 | } |
| 13 | var streams: [Stream] |
| 14 | |
| 15 | /// Load a manifest only if `url` is a readable JSON with a streams array. |
| 16 | static func load(_ url: URL) -> SyncManifest? { |
| 17 | guard let data = try? Data(contentsOf: url), |
| 18 | let m = try? JSONDecoder().decode(SyncManifest.self, from: data), |
| 19 | !m.streams.isEmpty else { return nil } |
| 20 | return m |
| 21 | } |
| 22 | |
| 23 | /// filename → offset seconds (missing offsets count as 0). |
| 24 | var offsetsByFile: [String: Double] { |
| 25 | Dictionary(streams.map { ($0.file, $0.offsetSeconds ?? 0) }, |
| 26 | uniquingKeysWith: { first, _ in first }) |
| 27 | } |
| 28 | } |