Support setPlaybackSpeed(float) with the MediaSessionConnector

Issue: #8229
#exofixit
PiperOrigin-RevId: 346968046

RELEASENOTES.md

@@ -116,6 +116,10 @@
     *   Notify onBufferingEnded when the state of origin player becomes
         `STATE_IDLE` or `STATE_ENDED`.
     *   Allow to remove all playlist items that makes the player reset.
+*   MediaSession extension:
+    *   Support `setPlaybackSpeed(float)` and disable it by default. Use
+        `MediaSessionConnector.setEnabledPlaybackActions(long)` to enable
+        ([#8229](https://github.com/google/ExoPlayer/issues/8229)).
 
 ### 2.12.1 (2020-10-23) ###
 

constants.gradle

@@ -32,7 +32,7 @@ project.ext {
     androidxAnnotationVersion = '1.1.0'
     androidxAppCompatVersion = '1.1.0'
     androidxCollectionVersion = '1.1.0'
-    androidxMediaVersion = '1.0.1'
+    androidxMediaVersion = '1.2.1'
     androidxMultidexVersion = '2.0.0'
     androidxRecyclerViewVersion = '1.1.0'
     androidxTestCoreVersion = '1.3.0'

extensions/mediasession/src/main/java/com/google/android/exoplayer2/ext/mediasession/MediaSessionConnector.java

@@ -101,6 +101,10 @@ public final class MediaSessionConnector {
     ExoPlayerLibraryInfo.registerModule("goog.exo.mediasession");
   }
 
+  /** Indicates this session supports the set playback speed command. */
+  // TODO(b/174297519) Replace with PlaybackStateCompat.ACTION_SET_PLAYBACK_SPEED when released.
+  public static final long ACTION_SET_PLAYBACK_SPEED = 1 << 22;
+
   /** Playback actions supported by the connector. */
   @LongDef(
       flag = true,
@@ -113,7 +117,8 @@ public final class MediaSessionConnector {
         PlaybackStateCompat.ACTION_REWIND,
         PlaybackStateCompat.ACTION_STOP,
         PlaybackStateCompat.ACTION_SET_REPEAT_MODE,
-        PlaybackStateCompat.ACTION_SET_SHUFFLE_MODE
+        PlaybackStateCompat.ACTION_SET_SHUFFLE_MODE,
+        ACTION_SET_PLAYBACK_SPEED
       })
   @Retention(RetentionPolicy.SOURCE)
   public @interface PlaybackActions {}
@@ -128,10 +133,13 @@ public final class MediaSessionConnector {
           | PlaybackStateCompat.ACTION_REWIND
           | PlaybackStateCompat.ACTION_STOP
           | PlaybackStateCompat.ACTION_SET_REPEAT_MODE
-          | PlaybackStateCompat.ACTION_SET_SHUFFLE_MODE;
+          | PlaybackStateCompat.ACTION_SET_SHUFFLE_MODE
+          | ACTION_SET_PLAYBACK_SPEED;
 
   /** The default playback actions. */
-  @PlaybackActions public static final long DEFAULT_PLAYBACK_ACTIONS = ALL_PLAYBACK_ACTIONS;
+  @PlaybackActions
+  public static final long DEFAULT_PLAYBACK_ACTIONS =
+      ALL_PLAYBACK_ACTIONS - ACTION_SET_PLAYBACK_SPEED;
 
   /**
    * The name of the {@link PlaybackStateCompat} float extra with the value of {@code
@@ -145,7 +153,8 @@ public final class MediaSessionConnector {
           | PlaybackStateCompat.ACTION_PAUSE
           | PlaybackStateCompat.ACTION_STOP
           | PlaybackStateCompat.ACTION_SET_SHUFFLE_MODE
-          | PlaybackStateCompat.ACTION_SET_REPEAT_MODE;
+          | PlaybackStateCompat.ACTION_SET_REPEAT_MODE
+          | ACTION_SET_PLAYBACK_SPEED;
   private static final int BASE_MEDIA_SESSION_FLAGS =
       MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS
           | MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS;
@@ -1230,6 +1239,14 @@ public final class MediaSessionConnector {
       }
     }
 
+    @Override
+    public void onSetPlaybackSpeed(float speed) {
+      if (canDispatchPlaybackAction(ACTION_SET_PLAYBACK_SPEED) && speed > 0) {
+        controlDispatcher.dispatchSetPlaybackParameters(
+            player, player.getPlaybackParameters().withSpeed(speed));
+      }
+    }
+
     @Override
     public void onSkipToNext() {
       if (canDispatchToQueueNavigator(PlaybackStateCompat.ACTION_SKIP_TO_NEXT)) {

library/core/src/main/java/com/google/android/exoplayer2/ControlDispatcher.java

@@ -113,6 +113,15 @@ public interface ControlDispatcher {
    */
   boolean dispatchStop(Player player, boolean reset);
 
+  /**
+   * Dispatches a {@link Player#setPlaybackParameters(PlaybackParameters)} operation.
+   *
+   * @param player The {@link Player} to which the operation should be dispatched.
+   * @param playbackParameters The playback parameters.
+   * @return True if the operation was dispatched. False if suppressed.
+   */
+  boolean dispatchSetPlaybackParameters(Player player, PlaybackParameters playbackParameters);
+
   /** Returns {@code true} if rewind is enabled, {@code false} otherwise. */
   boolean isRewindEnabled();
 

library/core/src/main/java/com/google/android/exoplayer2/DefaultControlDispatcher.java

@@ -139,6 +139,13 @@ public class DefaultControlDispatcher implements ControlDispatcher {
     return true;
   }
 
+  @Override
+  public boolean dispatchSetPlaybackParameters(
+      Player player, PlaybackParameters playbackParameters) {
+    player.setPlaybackParameters(playbackParameters);
+    return true;
+  }
+
   @Override
   public boolean isRewindEnabled() {
     return rewindIncrementMs > 0;