Add setPreferredAudioDevice method to ExoPlayer

This allows to access the associated functionality of AudioTrack and
fills a feature gap to MediaPlayer, which has a similar method.

Issue: #135
PiperOrigin-RevId: 476398964

RELEASENOTES.md

@@ -27,6 +27,8 @@
     *   Make `AudioTrackBufferSizeProvider` a public interface.
     *   Add `WrappingMediaSource` to simplify wrapping a single `MediaSource`
         ([#7279](https://github.com/google/ExoPlayer/issues/7279)).
+    *   Add `ExoPlayer.setPreferredAudioDevice` to set the preferred audio
+        output device ([#135](https://github.com/androidx/media/issues/135)).
 *   Metadata:
     *   `MetadataRenderer` can now be configured to render metadata as soon as
         they are available. Create an instance with

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayer.java

@@ -20,6 +20,7 @@
 import static androidx.media3.common.util.Assertions.checkState;
 
 import android.content.Context;
+import android.media.AudioDeviceInfo;
 import android.media.AudioTrack;
 import android.media.MediaCodec;
 import android.os.Looper;
@@ -29,6 +30,7 @@
 import android.view.TextureView;
 import androidx.annotation.IntRange;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 import androidx.annotation.VisibleForTesting;
 import androidx.media3.common.AudioAttributes;
 import androidx.media3.common.AuxEffectInfo;
@@ -1473,6 +1475,16 @@ void setMediaSources(
   @UnstableApi
   void clearAuxEffectInfo();
 
+  /**
+   * Sets the preferred audio device.
+   *
+   * @param audioDeviceInfo The preferred {@linkplain AudioDeviceInfo audio device}, or null to
+   *     restore the default.
+   */
+  @UnstableApi
+  @RequiresApi(23)
+  void setPreferredAudioDevice(@Nullable AudioDeviceInfo audioDeviceInfo);
+
   /**
    * Sets whether skipping silences in the audio stream is enabled.
    *

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayerImpl.java

@@ -26,6 +26,7 @@
 import static androidx.media3.exoplayer.Renderer.MSG_SET_AUX_EFFECT_INFO;
 import static androidx.media3.exoplayer.Renderer.MSG_SET_CAMERA_MOTION_LISTENER;
 import static androidx.media3.exoplayer.Renderer.MSG_SET_CHANGE_FRAME_RATE_STRATEGY;
+import static androidx.media3.exoplayer.Renderer.MSG_SET_PREFERRED_AUDIO_DEVICE;
 import static androidx.media3.exoplayer.Renderer.MSG_SET_SCALING_MODE;
 import static androidx.media3.exoplayer.Renderer.MSG_SET_SKIP_SILENCE_ENABLED;
 import static androidx.media3.exoplayer.Renderer.MSG_SET_VIDEO_FRAME_METADATA_LISTENER;
@@ -38,6 +39,7 @@
 import android.content.Context;
 import android.graphics.Rect;
 import android.graphics.SurfaceTexture;
+import android.media.AudioDeviceInfo;
 import android.media.AudioFormat;
 import android.media.AudioTrack;
 import android.media.MediaFormat;
@@ -1442,6 +1444,13 @@ public void clearAuxEffectInfo() {
     setAuxEffectInfo(new AuxEffectInfo(AuxEffectInfo.NO_AUX_EFFECT_ID, /* sendLevel= */ 0f));
   }
 
+  @RequiresApi(23)
+  @Override
+  public void setPreferredAudioDevice(@Nullable AudioDeviceInfo audioDeviceInfo) {
+    verifyApplicationThread();
+    sendRendererMessage(TRACK_TYPE_AUDIO, MSG_SET_PREFERRED_AUDIO_DEVICE, audioDeviceInfo);
+  }
+
   @Override
   public void setVolume(float volume) {
     verifyApplicationThread();

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/Renderer.java

@@ -198,6 +198,13 @@ interface WakeupListener {
    * <p>The message payload must be a {@link WakeupListener} instance.
    */
   int MSG_SET_WAKEUP_LISTENER = 11;
+  /**
+   * The type of a message that can be passed to audio renderers via {@link
+   * ExoPlayer#createMessage(PlayerMessage.Target)}. The message payload should be an {@link
+   * android.media.AudioDeviceInfo} instance representing the preferred audio device, or null to
+   * restore the default.
+   */
+  int MSG_SET_PREFERRED_AUDIO_DEVICE = 12;
   /**
    * Applications or extensions may define custom {@code MSG_*} constants that can be passed to
    * renderers. These custom constants must be greater than or equal to this value.

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/SimpleExoPlayer.java

@@ -16,13 +16,15 @@
 package androidx.media3.exoplayer;
 
 import android.content.Context;
+import android.media.AudioDeviceInfo;
 import android.os.Looper;
 import android.view.Surface;
 import android.view.SurfaceHolder;
 import android.view.SurfaceView;
 import android.view.TextureView;
 import androidx.annotation.IntRange;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 import androidx.annotation.VisibleForTesting;
 import androidx.media3.common.AudioAttributes;
 import androidx.media3.common.AuxEffectInfo;
@@ -628,6 +630,13 @@ public void clearAuxEffectInfo() {
     player.clearAuxEffectInfo();
   }
 
+  @RequiresApi(23)
+  @Override
+  public void setPreferredAudioDevice(@Nullable AudioDeviceInfo audioDeviceInfo) {
+    blockUntilConstructorFinished();
+    player.setPreferredAudioDevice(audioDeviceInfo);
+  }
+
   @Override
   public void setVolume(float volume) {
     blockUntilConstructorFinished();

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/AudioSink.java

@@ -17,9 +17,11 @@
 
 import static java.lang.annotation.ElementType.TYPE_USE;
 
+import android.media.AudioDeviceInfo;
 import android.media.AudioTrack;
 import androidx.annotation.IntDef;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 import androidx.media3.common.AudioAttributes;
 import androidx.media3.common.AuxEffectInfo;
 import androidx.media3.common.C;
@@ -420,6 +422,15 @@ boolean handleBuffer(ByteBuffer buffer, long presentationTimeUs, int encodedAcce
   /** Sets the auxiliary effect. */
   void setAuxEffectInfo(AuxEffectInfo auxEffectInfo);
 
+  /**
+   * Sets the preferred audio device.
+   *
+   * @param audioDeviceInfo The preferred {@linkplain AudioDeviceInfo audio device}, or null to
+   *     restore the default.
+   */
+  @RequiresApi(23)
+  default void setPreferredDevice(@Nullable AudioDeviceInfo audioDeviceInfo) {}
+
   /**
    * Enables tunneling, if possible. The sink is reset if tunneling was previously disabled.
    * Enabling tunneling is only possible if the sink is based on a platform {@link AudioTrack}, and

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DecoderAudioRenderer.java

@@ -23,11 +23,14 @@
 import static java.lang.Math.max;
 import static java.lang.annotation.ElementType.TYPE_USE;
 
+import android.media.AudioDeviceInfo;
 import android.os.Handler;
 import android.os.SystemClock;
 import androidx.annotation.CallSuper;
+import androidx.annotation.DoNotInline;
 import androidx.annotation.IntDef;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 import androidx.media3.common.AudioAttributes;
 import androidx.media3.common.AuxEffectInfo;
 import androidx.media3.common.C;
@@ -623,6 +626,11 @@ public void handleMessage(@MessageType int messageType, @Nullable Object message
       case MSG_SET_AUDIO_SESSION_ID:
         audioSink.setAudioSessionId((Integer) message);
         break;
+      case MSG_SET_PREFERRED_AUDIO_DEVICE:
+        if (Util.SDK_INT >= 23) {
+          Api23.setAudioSinkPreferredDevice(audioSink, message);
+        }
+        break;
       case MSG_SET_CAMERA_MOTION_LISTENER:
       case MSG_SET_CHANGE_FRAME_RATE_STRATEGY:
       case MSG_SET_SCALING_MODE:
@@ -795,4 +803,16 @@ public void onAudioSinkError(Exception audioSinkError) {
       eventDispatcher.audioSinkError(audioSinkError);
     }
   }
+
+  @RequiresApi(23)
+  private static final class Api23 {
+    private Api23() {}
+
+    @DoNotInline
+    public static void setAudioSinkPreferredDevice(
+        AudioSink audioSink, @Nullable Object messagePayload) {
+      @Nullable AudioDeviceInfo audioDeviceInfo = (AudioDeviceInfo) messagePayload;
+      audioSink.setPreferredDevice(audioDeviceInfo);
+    }
+  }
 }

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/DefaultAudioSink.java

@@ -24,6 +24,7 @@
 import static java.lang.annotation.ElementType.TYPE_USE;
 
 import android.annotation.SuppressLint;
+import android.media.AudioDeviceInfo;
 import android.media.AudioFormat;
 import android.media.AudioManager;
 import android.media.AudioTrack;
@@ -565,6 +566,7 @@ public DefaultAudioSink build() {
   private boolean externalAudioSessionIdProvided;
   private int audioSessionId;
   private AuxEffectInfo auxEffectInfo;
+  @Nullable private AudioDeviceInfoApi23 preferredDevice;
   private boolean tunneling;
   private long lastFeedElapsedRealtimeMs;
   private boolean offloadDisabledUntilNextConfiguration;
@@ -913,6 +915,9 @@ private boolean initializeAudioTrack() throws InitializationException {
       audioTrack.attachAuxEffect(auxEffectInfo.effectId);
       audioTrack.setAuxEffectSendLevel(auxEffectInfo.sendLevel);
     }
+    if (preferredDevice != null && Util.SDK_INT >= 23) {
+      Api23.setPreferredDeviceOnAudioTrack(audioTrack, preferredDevice);
+    }
 
     startMediaTimeUsNeedsInit = true;
     return true;
@@ -1413,6 +1418,16 @@ public void setAuxEffectInfo(AuxEffectInfo auxEffectInfo) {
     this.auxEffectInfo = auxEffectInfo;
   }
 
+  @RequiresApi(23)
+  @Override
+  public void setPreferredDevice(@Nullable AudioDeviceInfo audioDeviceInfo) {
+    this.preferredDevice =
+        audioDeviceInfo == null ? null : new AudioDeviceInfoApi23(audioDeviceInfo);
+    if (audioTrack != null) {
+      Api23.setPreferredDeviceOnAudioTrack(audioTrack, this.preferredDevice);
+    }
+  }
+
   @Override
   public void enableTunnelingV21() {
     Assertions.checkState(Util.SDK_INT >= 21);
@@ -2309,6 +2324,28 @@ public void clear() {
     }
   }
 
+  @RequiresApi(23)
+  private static final class AudioDeviceInfoApi23 {
+
+    public final AudioDeviceInfo audioDeviceInfo;
+
+    public AudioDeviceInfoApi23(AudioDeviceInfo audioDeviceInfo) {
+      this.audioDeviceInfo = audioDeviceInfo;
+    }
+  }
+
+  @RequiresApi(23)
+  private static final class Api23 {
+    private Api23() {}
+
+    @DoNotInline
+    public static void setPreferredDeviceOnAudioTrack(
+        AudioTrack audioTrack, @Nullable AudioDeviceInfoApi23 audioDeviceInfo) {
+      audioTrack.setPreferredDevice(
+          audioDeviceInfo == null ? null : audioDeviceInfo.audioDeviceInfo);
+    }
+  }
+
   @RequiresApi(31)
   private static final class Api31 {
     private Api31() {}

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/ForwardingAudioSink.java

@@ -15,7 +15,9 @@
  */
 package androidx.media3.exoplayer.audio;
 
+import android.media.AudioDeviceInfo;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 import androidx.media3.common.AudioAttributes;
 import androidx.media3.common.AuxEffectInfo;
 import androidx.media3.common.Format;
@@ -138,6 +140,12 @@ public void setAuxEffectInfo(AuxEffectInfo auxEffectInfo) {
     sink.setAuxEffectInfo(auxEffectInfo);
   }
 
+  @RequiresApi(23)
+  @Override
+  public void setPreferredDevice(@Nullable AudioDeviceInfo audioDeviceInfo) {
+    sink.setPreferredDevice(audioDeviceInfo);
+  }
+
   @Override
   public void enableTunnelingV21() {
     sink.enableTunnelingV21();

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/MediaCodecAudioRenderer.java

@@ -23,13 +23,16 @@
 
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.media.AudioDeviceInfo;
 import android.media.AudioFormat;
 import android.media.MediaCodec;
 import android.media.MediaCrypto;
 import android.media.MediaFormat;
 import android.os.Handler;
 import androidx.annotation.CallSuper;
+import androidx.annotation.DoNotInline;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 import androidx.media3.common.AudioAttributes;
 import androidx.media3.common.AuxEffectInfo;
 import androidx.media3.common.C;
@@ -749,6 +752,11 @@ public void handleMessage(@MessageType int messageType, @Nullable Object message
         AuxEffectInfo auxEffectInfo = (AuxEffectInfo) message;
         audioSink.setAuxEffectInfo(auxEffectInfo);
         break;
+      case MSG_SET_PREFERRED_AUDIO_DEVICE:
+        if (Util.SDK_INT >= 23) {
+          Api23.setAudioSinkPreferredDevice(audioSink, message);
+        }
+        break;
       case MSG_SET_SKIP_SILENCE_ENABLED:
         audioSink.setSkipSilenceEnabled((Boolean) message);
         break;
@@ -942,4 +950,16 @@ public void onAudioSinkError(Exception audioSinkError) {
       eventDispatcher.audioSinkError(audioSinkError);
     }
   }
+
+  @RequiresApi(23)
+  private static final class Api23 {
+    private Api23() {}
+
+    @DoNotInline
+    public static void setAudioSinkPreferredDevice(
+        AudioSink audioSink, @Nullable Object messagePayload) {
+      @Nullable AudioDeviceInfo audioDeviceInfo = (AudioDeviceInfo) messagePayload;
+      audioSink.setPreferredDevice(audioDeviceInfo);
+    }
+  }
 }

libraries/test_utils/src/main/java/androidx/media3/test/utils/StubExoPlayer.java

@@ -15,6 +15,7 @@
  */
 package androidx.media3.test.utils;
 
+import android.media.AudioDeviceInfo;
 import android.os.Looper;
 import androidx.annotation.Nullable;
 import androidx.media3.common.AudioAttributes;
@@ -236,6 +237,11 @@ public void clearAuxEffectInfo() {
     throw new UnsupportedOperationException();
   }
 
+  @Override
+  public void setPreferredAudioDevice(@Nullable AudioDeviceInfo audioDeviceInfo) {
+    throw new UnsupportedOperationException();
+  }
+
   @Override
   public void setSkipSilenceEnabled(boolean skipSilenceEnabled) {
     throw new UnsupportedOperationException();