Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/MediaPlayer/Sources/MediaFrameSource.swift

@@ -0,0 +1,31 @@
+import Foundation
+import SwiftSignalKit
+import CoreMedia
+
+public enum MediaTrackEvent {
+    case frames([MediaTrackDecodableFrame])
+    case endOfStream
+}
+
+public final class MediaFrameSourceSeekResult {
+    public let buffers: MediaPlaybackBuffers
+    public let extraDecodedVideoFrames: [MediaTrackFrame]
+    public let timestamp: CMTime
+    
+    public init(buffers: MediaPlaybackBuffers, extraDecodedVideoFrames: [MediaTrackFrame], timestamp: CMTime) {
+        self.buffers = buffers
+        self.extraDecodedVideoFrames = extraDecodedVideoFrames
+        self.timestamp = timestamp
+    }
+}
+
+public enum MediaFrameSourceSeekError {
+    case generic
+}
+
+public protocol MediaFrameSource {
+    func addEventSink(_ f: @escaping (MediaTrackEvent) -> Void) -> Int
+    func removeEventSink(_ index: Int)
+    func generateFrames(until timestamp: Double, types: [MediaTrackFrameType])
+    func seek(timestamp: Double) -> Signal<QueueLocalObject<MediaFrameSourceSeekResult>, MediaFrameSourceSeekError>
+}