add native player controls and captions

Dreamio/VLCNativePlaybackBackend.swift

@@ -16,10 +16,13 @@ final class VLCNativePlaybackBackend: NSObject, NativePlaybackBackend {
     let view = UIView()
     var onReady: (() -> Void)?
     var onFailure: ((Error) -> Void)?
+    var onStateChange: (() -> Void)?
+    var onSubtitleTracksChange: (() -> Void)?
 
 #if canImport(MobileVLCKit)
     private let mediaPlayer = VLCMediaPlayer()
 #endif
+    private var attachedSubtitleURLs = Set<URL>()
 
     override init() {
         super.init()
@@ -54,11 +57,61 @@ final class VLCNativePlaybackBackend: NSObject, NativePlaybackBackend {
         print("[DreamioVLC] opening url=\(URLRedactor.redactedURLString(request.playbackURL.absoluteString))")
 #endif
         mediaPlayer.play()
+        attachSubtitles(request.subtitleCandidates)
 #else
         onFailure?(NativePlaybackError.backendUnavailable)
 #endif
     }
 
+    func play() {
+#if canImport(MobileVLCKit)
+        mediaPlayer.play()
+#endif
+    }
+
+    func pause() {
+#if canImport(MobileVLCKit)
+        mediaPlayer.pause()
+#endif
+    }
+
+    func togglePlayPause() {
+        isPlaying ? pause() : play()
+    }
+
+    func seek(to position: Float) {
+#if canImport(MobileVLCKit)
+        guard isSeekable else {
+            return
+        }
+        mediaPlayer.position = max(0, min(1, position))
+#endif
+    }
+
+    func jump(by seconds: TimeInterval) {
+#if canImport(MobileVLCKit)
+        guard isSeekable else {
+            return
+        }
+        let nextTime = max(0, min(duration, currentTime + seconds))
+        mediaPlayer.time = VLCTime(int: Int32(nextTime * 1000))
+#endif
+    }
+
+    func selectSubtitleTrack(id: Int32) {
+#if canImport(MobileVLCKit)
+        mediaPlayer.currentVideoSubTitleIndex = id
+        onSubtitleTracksChange?()
+#endif
+    }
+
+    func adjustSubtitleDelay(by seconds: TimeInterval) {
+#if canImport(MobileVLCKit)
+        mediaPlayer.currentVideoSubTitleDelay += Int(seconds * 1_000_000)
+        onSubtitleTracksChange?()
+#endif
+    }
+
     func stop() {
 #if canImport(MobileVLCKit)
         mediaPlayer.stop()
@@ -66,6 +119,93 @@ final class VLCNativePlaybackBackend: NSObject, NativePlaybackBackend {
         mediaPlayer.media = nil
 #endif
     }
+
+    var isPlaying: Bool {
+#if canImport(MobileVLCKit)
+        mediaPlayer.isPlaying
+#else
+        false
+#endif
+    }
+
+    var isSeekable: Bool {
+#if canImport(MobileVLCKit)
+        mediaPlayer.isSeekable
+#else
+        false
+#endif
+    }
+
+    var duration: TimeInterval {
+#if canImport(MobileVLCKit)
+        TimeInterval(max(0, mediaPlayer.media?.length.intValue ?? 0)) / 1000
+#else
+        0
+#endif
+    }
+
+    var currentTime: TimeInterval {
+#if canImport(MobileVLCKit)
+        TimeInterval(max(0, mediaPlayer.time.intValue)) / 1000
+#else
+        0
+#endif
+    }
+
+    var remainingTime: TimeInterval {
+        max(0, duration - currentTime)
+    }
+
+    var position: Float {
+#if canImport(MobileVLCKit)
+        mediaPlayer.position
+#else
+        0
+#endif
+    }
+
+    var subtitleTracks: [SubtitleTrack] {
+#if canImport(MobileVLCKit)
+        let names = mediaPlayer.videoSubTitlesNames as? [String] ?? []
+        let indexes = mediaPlayer.videoSubTitlesIndexes as? [NSNumber] ?? []
+        return zip(indexes, names).map { index, name in
+            SubtitleTrack(id: index.int32Value, name: name)
+        }
+#else
+        []
+#endif
+    }
+
+    var selectedSubtitleTrackID: Int32 {
+#if canImport(MobileVLCKit)
+        mediaPlayer.currentVideoSubTitleIndex
+#else
+        -1
+#endif
+    }
+
+    var subtitleDelay: TimeInterval {
+#if canImport(MobileVLCKit)
+        TimeInterval(mediaPlayer.currentVideoSubTitleDelay) / 1_000_000
+#else
+        0
+#endif
+    }
+
+#if canImport(MobileVLCKit)
+    private func attachSubtitles(_ candidates: [SubtitleCandidate]) {
+        candidates.forEach { candidate in
+            guard !attachedSubtitleURLs.contains(candidate.url) else {
+                return
+            }
+            attachedSubtitleURLs.insert(candidate.url)
+            mediaPlayer.addPlaybackSlave(candidate.url, type: .subtitle, enforce: false)
+#if DEBUG
+            print("[DreamioVLC] attached subtitle=\(URLRedactor.redactedURLString(candidate.url.absoluteString))")
+#endif
+        }
+    }
+#endif
 }
 
 #if canImport(MobileVLCKit)
@@ -77,8 +217,13 @@ extension VLCNativePlaybackBackend: VLCMediaPlayerDelegate {
         switch mediaPlayer.state {
         case .buffering, .playing:
             onReady?()
+            onStateChange?()
         case .error:
             onFailure?(NativePlaybackError.playbackFailed)
+        case .paused, .stopped, .ended:
+            onStateChange?()
+        case .esAdded:
+            onSubtitleTracksChange?()
         default:
             break
         }