[video_player] Add speed adjustment support for Android

packages/video_player/android/src/main/java/io/flutter/plugins/videoplayer/VideoPlayerPlugin.java

@@ -15,6 +15,7 @@
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayerFactory;
+import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Player.DefaultEventListener;
 import com.google.android.exoplayer2.SimpleExoPlayer;
@@ -207,6 +208,14 @@ void setVolume(double value) {
       exoPlayer.setVolume(bracketedValue);
     }
 
+    void setSpeed(double value) {
+      if (value <= 0.0) return;
+      PlaybackParameters parameters = exoPlayer.getPlaybackParameters();
+      PlaybackParameters newParameters =
+          new PlaybackParameters((float) value, parameters.pitch, parameters.skipSilence);
+      exoPlayer.setPlaybackParameters(newParameters);
+    }
+
     void seekTo(int location) {
       exoPlayer.seekTo(location);
     }
@@ -356,6 +365,10 @@ private void onMethodCall(MethodCall call, Result result, long textureId, VideoP
         player.setVolume((Double) call.argument("volume"));
         result.success(null);
         break;
+      case "setSpeed":
+        player.setSpeed((Double) call.argument("speed"));
+        result.success(null);
+        break;
       case "play":
         player.play();
         result.success(null);

packages/video_player/ios/Classes/VideoPlayerPlugin.m

@@ -368,6 +368,9 @@ - (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
     } else if ([@"setVolume" isEqualToString:call.method]) {
       [player setVolume:[[argsMap objectForKey:@"volume"] doubleValue]];
       result(nil);
+    } else if ([@"setSpeed" isEqualToString:call.method]) {
+      // TODO: Implement setSpeed
+      result(nil);
     } else if ([@"play" isEqualToString:call.method]) {
       [player play];
       result(nil);

packages/video_player/lib/video_player.dart

@@ -44,6 +44,7 @@ class VideoPlayerValue {
     this.isLooping = false,
     this.isBuffering = false,
     this.volume = 1.0,
+    this.speed = 1.0,
     this.errorDescription,
   });
 
@@ -75,6 +76,9 @@ class VideoPlayerValue {
   /// The current volume of the playback.
   final double volume;
 
+  /// The current speed of the playback.
+  final double speed;
+
   /// A description of the error if present.
   ///
   /// If [hasError] is false this is [null].
@@ -98,6 +102,7 @@ class VideoPlayerValue {
     bool isLooping,
     bool isBuffering,
     double volume,
+    double speed,
     String errorDescription,
   }) {
     return VideoPlayerValue(
@@ -109,6 +114,7 @@ class VideoPlayerValue {
       isLooping: isLooping ?? this.isLooping,
       isBuffering: isBuffering ?? this.isBuffering,
       volume: volume ?? this.volume,
+      speed: speed ?? this.speed,
       errorDescription: errorDescription ?? this.errorDescription,
     );
   }
@@ -122,8 +128,9 @@ class VideoPlayerValue {
         'buffered: [${buffered.join(', ')}], '
         'isPlaying: $isPlaying, '
         'isLooping: $isLooping, '
-        'isBuffering: $isBuffering'
+        'isBuffering: $isBuffering, '
         'volume: $volume, '
+        'speed: $speed, '
         'errorDescription: $errorDescription)';
   }
 }
@@ -233,6 +240,7 @@ class VideoPlayerController extends ValueNotifier<VideoPlayerValue> {
           initializingCompleter.complete(null);
           _applyLooping();
           _applyVolume();
+          _applySpeed();
           _applyPlayPause();
           break;
         case 'completed':
@@ -355,6 +363,16 @@ class VideoPlayerController extends ValueNotifier<VideoPlayerValue> {
     );
   }
 
+  Future<void> _applySpeed() async {
+    if (!value.initialized || _isDisposed) {
+      return;
+    }
+    await _channel.invokeMethod(
+      'setSpeed',
+      <String, dynamic>{'textureId': _textureId, 'speed': value.speed},
+    );
+  }
+
   /// The position in the current video.
   Future<Duration> get position async {
     if (_isDisposed) {
@@ -392,6 +410,15 @@ class VideoPlayerController extends ValueNotifier<VideoPlayerValue> {
     value = value.copyWith(volume: volume.clamp(0.0, 1.0));
     await _applyVolume();
   }
+
+  /// Sets the playback speed of [this].
+  ///
+  /// [speed] must be greater than zero.
+  Future<void> setSpeed(double speed) async {
+    if (speed <= 0.0) return;
+    value = value.copyWith(speed: speed);
+    await _applySpeed();
+  }
 }
 
 class _VideoAppLifeCycleObserver extends Object with WidgetsBindingObserver {

packages/video_player/test/video_player_test.dart

@@ -30,6 +30,8 @@ class FakeController extends ValueNotifier<VideoPlayerValue>
   @override
   Future<void> setVolume(double volume) async {}
   @override
+  Future<void> setSpeed(double speed) async {}
+  @override
   Future<void> initialize() async {}
   @override
   Future<void> pause() async {}