Move AudioComponent to ExoPlayer leaving key methods in Player

PiperOrigin-RevId: 368413660

extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java

@@ -30,6 +30,7 @@ import com.google.android.exoplayer2.MediaMetadata;
 import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Timeline;
+import com.google.android.exoplayer2.audio.AudioAttributes;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.source.TrackGroup;
 import com.google.android.exoplayer2.source.TrackGroupArray;
@@ -251,14 +252,13 @@ public final class CastPlayer extends BasePlayer {
   public MediaQueueItem getItem(int periodId) {
     MediaStatus mediaStatus = getMediaStatus();
     return mediaStatus != null && currentTimeline.getIndexOfPeriod(periodId) != C.INDEX_UNSET
-        ? mediaStatus.getItemById(periodId) : null;
+        ? mediaStatus.getItemById(periodId)
+        : null;
   }
 
   // CastSession methods.
 
-  /**
-   * Returns whether a cast session is available.
-   */
+  /** Returns whether a cast session is available. */
   public boolean isCastSessionAvailable() {
     return remoteMediaClient != null;
   }
@@ -274,12 +274,6 @@ public final class CastPlayer extends BasePlayer {
 
   // Player implementation.
 
-  @Override
-  @Nullable
-  public AudioComponent getAudioComponent() {
-    return null;
-  }
-
   @Override
   @Nullable
   public VideoComponent getVideoComponent() {
@@ -461,8 +455,10 @@ public final class CastPlayer extends BasePlayer {
     positionMs = positionMs != C.TIME_UNSET ? positionMs : 0;
     if (mediaStatus != null) {
       if (getCurrentWindowIndex() != windowIndex) {
-        remoteMediaClient.queueJumpToItem((int) currentTimeline.getPeriod(windowIndex, period).uid,
-            positionMs, null).setResultCallback(seekResultCallback);
+        remoteMediaClient
+            .queueJumpToItem(
+                (int) currentTimeline.getPeriod(windowIndex, period).uid, positionMs, null)
+            .setResultCallback(seekResultCallback);
       } else {
         remoteMediaClient.seek(positionMs).setResultCallback(seekResultCallback);
       }
@@ -545,7 +541,8 @@ public final class CastPlayer extends BasePlayer {
   }
 
   @Override
-  @RepeatMode public int getRepeatMode() {
+  @RepeatMode
+  public int getRepeatMode() {
     return repeatMode.value;
   }
 
@@ -657,6 +654,22 @@ public final class CastPlayer extends BasePlayer {
     return getBufferedPosition();
   }
 
+  /** This method is not supported and returns {@link AudioAttributes#DEFAULT}. */
+  @Override
+  public AudioAttributes getAudioAttributes() {
+    return AudioAttributes.DEFAULT;
+  }
+
+  /** This method is not supported and does nothing. */
+  @Override
+  public void setVolume(float audioVolume) {}
+
+  /** This method is not supported and returns 1. */
+  @Override
+  public float getVolume() {
+    return 1;
+  }
+
   // Internal methods.
 
   // Call deprecated callbacks.
@@ -897,7 +910,8 @@ public final class CastPlayer extends BasePlayer {
       long id = mediaTrack.getId();
       int trackType = MimeTypes.getTrackType(mediaTrack.getContentType());
       int rendererIndex = getRendererIndexForTrackType(trackType);
-      if (isTrackActive(id, activeTrackIds) && rendererIndex != C.INDEX_UNSET
+      if (isTrackActive(id, activeTrackIds)
+          && rendererIndex != C.INDEX_UNSET
           && trackSelections[rendererIndex] == null) {
         trackSelections[rendererIndex] = new CastTrackSelection(trackGroups[i]);
       }
@@ -1097,8 +1111,8 @@ public final class CastPlayer extends BasePlayer {
   }
 
   /**
-   * Retrieves the repeat mode from {@code remoteMediaClient} and maps it into a
-   * {@link Player.RepeatMode}.
+   * Retrieves the repeat mode from {@code remoteMediaClient} and maps it into a {@link
+   * Player.RepeatMode}.
    */
   @RepeatMode
   private static int fetchRepeatMode(RemoteMediaClient remoteMediaClient) {
@@ -1238,8 +1252,12 @@ public final class CastPlayer extends BasePlayer {
 
     @Override
     public void onSessionResumeFailed(CastSession castSession, int statusCode) {
-      Log.e(TAG, "Session resume failed. Error code " + statusCode + ": "
-          + CastUtils.getLogString(statusCode));
+      Log.e(
+          TAG,
+          "Session resume failed. Error code "
+              + statusCode
+              + ": "
+              + CastUtils.getLogString(statusCode));
     }
 
     @Override
@@ -1249,8 +1267,12 @@ public final class CastPlayer extends BasePlayer {
 
     @Override
     public void onSessionStartFailed(CastSession castSession, int statusCode) {
-      Log.e(TAG, "Session start failed. Error code " + statusCode + ": "
-          + CastUtils.getLogString(statusCode));
+      Log.e(
+          TAG,
+          "Session start failed. Error code "
+              + statusCode
+              + ": "
+              + CastUtils.getLogString(statusCode));
     }
 
     @Override
@@ -1262,7 +1284,6 @@ public final class CastPlayer extends BasePlayer {
     public void onSessionResuming(CastSession castSession, String s) {
       // Do nothing.
     }
-
   }
 
   private final class SeekResultCallback implements ResultCallback<MediaChannelResult> {
@@ -1274,8 +1295,9 @@ public final class CastPlayer extends BasePlayer {
     public void onResult(MediaChannelResult result) {
       int statusCode = result.getStatus().getStatusCode();
       if (statusCode != CastStatusCodes.SUCCESS && statusCode != CastStatusCodes.REPLACED) {
-        Log.e(TAG, "Seek failed. Error code " + statusCode + ": "
-            + CastUtils.getLogString(statusCode));
+        Log.e(
+            TAG,
+            "Seek failed. Error code " + statusCode + ": " + CastUtils.getLogString(statusCode));
       }
       if (--pendingSeekCount == 0) {
         currentWindowIndex = pendingSeekWindowIndex;

extensions/cast/src/test/java/com/google/android/exoplayer2/ext/cast/CastPlayerTest.java

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2.ext.cast;
 
 import static com.google.android.exoplayer2.Player.COMMAND_ADJUST_DEVICE_VOLUME;
 import static com.google.android.exoplayer2.Player.COMMAND_CHANGE_MEDIA_ITEMS;
+import static com.google.android.exoplayer2.Player.COMMAND_GET_AUDIO_ATTRIBUTES;
 import static com.google.android.exoplayer2.Player.COMMAND_GET_CURRENT_MEDIA_ITEM;
 import static com.google.android.exoplayer2.Player.COMMAND_GET_DEVICE_VOLUME;
 import static com.google.android.exoplayer2.Player.COMMAND_GET_MEDIA_ITEMS;
@@ -102,6 +103,7 @@ public class CastPlayerTest {
   @Captor
   private ArgumentCaptor<ResultCallback<RemoteMediaClient.MediaChannelResult>>
       setResultCallbackArgumentCaptor;
+
   @Captor private ArgumentCaptor<RemoteMediaClient.Callback> callbackArgumentCaptor;
   @Captor private ArgumentCaptor<MediaQueueItem[]> queueItemsArgumentCaptor;
   @Captor private ArgumentCaptor<MediaItem> mediaItemCaptor;
@@ -1119,6 +1121,7 @@ public class CastPlayerTest {
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_MEDIA_ITEMS)).isTrue();
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_MEDIA_ITEMS_METADATA)).isTrue();
     assertThat(castPlayer.isCommandAvailable(COMMAND_CHANGE_MEDIA_ITEMS)).isTrue();
+    assertThat(castPlayer.isCommandAvailable(COMMAND_GET_AUDIO_ATTRIBUTES)).isFalse();
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_VOLUME)).isFalse();
     assertThat(castPlayer.isCommandAvailable(COMMAND_GET_DEVICE_VOLUME)).isFalse();
     assertThat(castPlayer.isCommandAvailable(COMMAND_SET_VOLUME)).isFalse();

extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/AdTagLoader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.ext.ima;
 
+import static com.google.android.exoplayer2.Player.COMMAND_GET_VOLUME;
 import static com.google.android.exoplayer2.ext.ima.ImaUtil.BITRATE_UNSET;
 import static com.google.android.exoplayer2.ext.ima.ImaUtil.TIMEOUT_UNSET;
 import static com.google.android.exoplayer2.ext.ima.ImaUtil.getAdGroupTimesUsForCuePoints;
@@ -700,9 +701,8 @@ import java.util.Map;
       return lastVolumePercent;
     }
 
-    @Nullable Player.AudioComponent audioComponent = player.getAudioComponent();
-    if (audioComponent != null) {
-      return (int) (audioComponent.getVolume() * 100);
+    if (player.isCommandAvailable(COMMAND_GET_VOLUME)) {
+      return (int) (player.getVolume() * 100);
     }
 
     // Check for a selected track using an audio renderer.

extensions/ima/src/test/java/com/google/android/exoplayer2/ext/ima/FakePlayer.java

@@ -194,6 +194,17 @@ import com.google.android.exoplayer2.util.ListenerSet;
     listeners.remove(listener);
   }
 
+  @Override
+  public boolean isCommandAvailable(@Command int command) {
+    // Only support querrying the minimal set of command for testing.
+    switch (command) {
+      case COMMAND_GET_VOLUME:
+        return false;
+      default:
+        throw new UnsupportedOperationException();
+    }
+  }
+
   @Override
   @Player.State
   public int getPlaybackState() {

extensions/media2/src/main/java/com/google/android/exoplayer2/ext/media2/PlayerWrapper.java

@@ -33,7 +33,6 @@ import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.audio.AudioAttributes;
-import com.google.android.exoplayer2.audio.AudioListener;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.Util;
@@ -138,10 +137,6 @@ import java.util.List;
     controlDispatcher = new DefaultControlDispatcher();
     componentListener = new ComponentListener();
     player.addListener(componentListener);
-    @Nullable Player.AudioComponent audioComponent = player.getAudioComponent();
-    if (audioComponent != null) {
-      audioComponent.addAudioListener(componentListener);
-    }
 
     handler = new Handler(player.getApplicationLooper());
     pollBufferRunnable = new PollBufferRunnable();
@@ -455,15 +450,15 @@ import java.util.List;
   }
 
   public void setAudioAttributes(AudioAttributesCompat audioAttributes) {
-    Player.AudioComponent audioComponent = Assertions.checkStateNotNull(player.getAudioComponent());
-    audioComponent.setAudioAttributes(
-        Utils.getAudioAttributes(audioAttributes), /* handleAudioFocus= */ true);
+    // Player interface doesn't support setting audio attributes.
   }
 
   public AudioAttributesCompat getAudioAttributes() {
-    @Nullable Player.AudioComponent audioComponent = player.getAudioComponent();
-    return Utils.getAudioAttributesCompat(
-        audioComponent != null ? audioComponent.getAudioAttributes() : AudioAttributes.DEFAULT);
+    AudioAttributes audioAttributes = AudioAttributes.DEFAULT;
+    if (player.isCommandAvailable(Player.COMMAND_GET_AUDIO_ATTRIBUTES)) {
+      audioAttributes = player.getAudioAttributes();
+    }
+    return Utils.getAudioAttributesCompat(audioAttributes);
   }
 
   public void setPlaybackSpeed(float playbackSpeed) {
@@ -483,11 +478,6 @@ import java.util.List;
   public void close() {
     handler.removeCallbacks(pollBufferRunnable);
     player.removeListener(componentListener);
-
-    @Nullable Player.AudioComponent audioComponent = player.getAudioComponent();
-    if (audioComponent != null) {
-      audioComponent.removeAudioListener(componentListener);
-    }
   }
 
   public boolean isCurrentMediaItemSeekable() {
@@ -584,7 +574,7 @@ import java.util.List;
     }
   }
 
-  private final class ComponentListener implements Player.EventListener, AudioListener {
+  private final class ComponentListener implements Player.Listener {
 
     // Player.EventListener implementation.
 

library/common/src/main/java/com/google/android/exoplayer2/Player.java

@@ -15,7 +15,6 @@
  */
 package com.google.android.exoplayer2;
 
-import android.content.Context;
 import android.os.Looper;
 import android.view.Surface;
 import android.view.SurfaceHolder;
@@ -25,7 +24,6 @@ import androidx.annotation.IntDef;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.audio.AudioAttributes;
 import com.google.android.exoplayer2.audio.AudioListener;
-import com.google.android.exoplayer2.audio.AuxEffectInfo;
 import com.google.android.exoplayer2.device.DeviceInfo;
 import com.google.android.exoplayer2.device.DeviceListener;
 import com.google.android.exoplayer2.metadata.Metadata;
@@ -68,95 +66,6 @@ import java.util.List;
  */
 public interface Player {
 
-  /** The audio component of a {@link Player}. */
-  interface AudioComponent {
-
-    /**
-     * Adds a listener to receive audio events.
-     *
-     * @param listener The listener to register.
-     */
-    void addAudioListener(AudioListener listener);
-
-    /**
-     * Removes a listener of audio events.
-     *
-     * @param listener The listener to unregister.
-     */
-    void removeAudioListener(AudioListener listener);
-
-    /**
-     * Sets the attributes for audio playback, used by the underlying audio track. If not set, the
-     * default audio attributes will be used. They are suitable for general media playback.
-     *
-     * <p>Setting the audio attributes during playback may introduce a short gap in audio output as
-     * the audio track is recreated. A new audio session id will also be generated.
-     *
-     * <p>If tunneling is enabled by the track selector, the specified audio attributes will be
-     * ignored, but they will take effect if audio is later played without tunneling.
-     *
-     * <p>If the device is running a build before platform API version 21, audio attributes cannot
-     * be set directly on the underlying audio track. In this case, the usage will be mapped onto an
-     * equivalent stream type using {@link Util#getStreamTypeForAudioUsage(int)}.
-     *
-     * <p>If audio focus should be handled, the {@link AudioAttributes#usage} must be {@link
-     * C#USAGE_MEDIA} or {@link C#USAGE_GAME}. Other usages will throw an {@link
-     * IllegalArgumentException}.
-     *
-     * @param audioAttributes The attributes to use for audio playback.
-     * @param handleAudioFocus True if the player should handle audio focus, false otherwise.
-     */
-    void setAudioAttributes(AudioAttributes audioAttributes, boolean handleAudioFocus);
-
-    /** Returns the attributes for audio playback. */
-    AudioAttributes getAudioAttributes();
-
-    /**
-     * Sets the ID of the audio session to attach to the underlying {@link
-     * android.media.AudioTrack}.
-     *
-     * <p>The audio session ID can be generated using {@link C#generateAudioSessionIdV21(Context)}
-     * for API 21+.
-     *
-     * @param audioSessionId The audio session ID, or {@link C#AUDIO_SESSION_ID_UNSET} if it should
-     *     be generated by the framework.
-     */
-    void setAudioSessionId(int audioSessionId);
-
-    /** Returns the audio session identifier, or {@link C#AUDIO_SESSION_ID_UNSET} if not set. */
-    int getAudioSessionId();
-
-    /** Sets information on an auxiliary audio effect to attach to the underlying audio track. */
-    void setAuxEffectInfo(AuxEffectInfo auxEffectInfo);
-
-    /** Detaches any previously attached auxiliary audio effect from the underlying audio track. */
-    void clearAuxEffectInfo();
-
-    /**
-     * Sets the audio volume, with 0 being silence and 1 being unity gain (signal unchanged).
-     *
-     * @param audioVolume Linear output gain to apply to all audio channels.
-     */
-    void setVolume(float audioVolume);
-
-    /**
-     * Returns the audio volume, with 0 being silence and 1 being unity gain (signal unchanged).
-     *
-     * @return The linear gain applied to all audio channels.
-     */
-    float getVolume();
-
-    /**
-     * Sets whether skipping silences in the audio stream is enabled.
-     *
-     * @param skipSilenceEnabled Whether skipping silences in the audio stream is enabled.
-     */
-    void setSkipSilenceEnabled(boolean skipSilenceEnabled);
-
-    /** Returns whether skipping silences in the audio stream is enabled. */
-    boolean getSkipSilenceEnabled();
-  }
-
   /** The video component of a {@link Player}. */
   interface VideoComponent {
 
@@ -354,8 +263,7 @@ public interface Player {
      * <p>For devices with {@link DeviceInfo#PLAYBACK_TYPE_LOCAL local playback}, the volume
      * returned by this method varies according to the current {@link C.StreamType stream type}. The
      * stream type is determined by {@link AudioAttributes#usage} which can be converted to stream
-     * type with {@link Util#getStreamTypeForAudioUsage(int)}. The audio attributes can be set to
-     * the player by calling {@link AudioComponent#setAudioAttributes}.
+     * type with {@link Util#getStreamTypeForAudioUsage(int)}.
      *
      * <p>For devices with {@link DeviceInfo#PLAYBACK_TYPE_REMOTE remote playback}, the volume of
      * the remote device is returned.
@@ -930,11 +838,12 @@ public interface Player {
           DeviceListener,
           EventListener {
 
-    @Override
-    default void onMetadata(Metadata metadata) {}
-
+    // For backward compatibility TextOutput and MetadataOutput must stay functional interfaces.
     @Override
     default void onCues(List<Cue> cues) {}
+
+    @Override
+    default void onMetadata(Metadata metadata) {}
   }
 
   /**
@@ -1179,10 +1088,10 @@ public interface Player {
    * #COMMAND_SET_SPEED_AND_PITCH}, {@link #COMMAND_SET_SHUFFLE_MODE}, {@link
    * #COMMAND_SET_REPEAT_MODE}, {@link #COMMAND_GET_CURRENT_MEDIA_ITEM}, {@link
    * #COMMAND_GET_MEDIA_ITEMS}, {@link #COMMAND_GET_MEDIA_ITEMS_METADATA}, {@link
-   * #COMMAND_CHANGE_MEDIA_ITEMS}, {@link #COMMAND_GET_VOLUME}, {@link #COMMAND_GET_DEVICE_VOLUME},
-   * {@link #COMMAND_SET_VOLUME}, {@link #COMMAND_SET_DEVICE_VOLUME}, {@link
-   * #COMMAND_ADJUST_DEVICE_VOLUME}, {@link #COMMAND_SET_VIDEO_SURFACE} or {@link
-   * #COMMAND_GET_TEXT}.
+   * #COMMAND_CHANGE_MEDIA_ITEMS}, {@link #COMMAND_GET_AUDIO_ATTRIBUTES}, {@link
+   * #COMMAND_GET_VOLUME}, {@link #COMMAND_GET_DEVICE_VOLUME}, {@link #COMMAND_SET_VOLUME}, {@link
+   * #COMMAND_SET_DEVICE_VOLUME}, {@link #COMMAND_ADJUST_DEVICE_VOLUME}, {@link
+   * #COMMAND_SET_VIDEO_SURFACE} or {@link #COMMAND_GET_TEXT}.
    */
   @Documented
   @Retention(RetentionPolicy.SOURCE)
@@ -1201,6 +1110,7 @@ public interface Player {
     COMMAND_GET_MEDIA_ITEMS,
     COMMAND_GET_MEDIA_ITEMS_METADATA,
     COMMAND_CHANGE_MEDIA_ITEMS,
+    COMMAND_GET_AUDIO_ATTRIBUTES,
     COMMAND_GET_VOLUME,
     COMMAND_GET_DEVICE_VOLUME,
     COMMAND_SET_VOLUME,
@@ -1238,24 +1148,22 @@ public interface Player {
   int COMMAND_GET_MEDIA_ITEMS_METADATA = 13;
   /** Command to change the {@link MediaItem MediaItems} in the playlist. */
   int COMMAND_CHANGE_MEDIA_ITEMS = 14;
+  /** Command to get the player current {@link AudioAttributes}. */
+  int COMMAND_GET_AUDIO_ATTRIBUTES = 15;
   /** Command to get the player volume. */
-  int COMMAND_GET_VOLUME = 15;
+  int COMMAND_GET_VOLUME = 16;
   /** Command to get the device volume and whether it is muted. */
-  int COMMAND_GET_DEVICE_VOLUME = 16;
+  int COMMAND_GET_DEVICE_VOLUME = 17;
   /** Command to set the player volume. */
-  int COMMAND_SET_VOLUME = 17;
+  int COMMAND_SET_VOLUME = 18;
   /** Command to set the device volume and mute it. */
-  int COMMAND_SET_DEVICE_VOLUME = 18;
+  int COMMAND_SET_DEVICE_VOLUME = 19;
   /** Command to increase and decrease the device volume and mute it. */
-  int COMMAND_ADJUST_DEVICE_VOLUME = 19;
+  int COMMAND_ADJUST_DEVICE_VOLUME = 20;
   /** Command to set and clear the surface on which to render the video. */
-  int COMMAND_SET_VIDEO_SURFACE = 20;
+  int COMMAND_SET_VIDEO_SURFACE = 21;
   /** Command to get the text that should currently be displayed by the player. */
-  int COMMAND_GET_TEXT = 21;
-
-  /** Returns the component of this player for audio output, or null if audio is not supported. */
-  @Nullable
-  AudioComponent getAudioComponent();
+  int COMMAND_GET_TEXT = 22;
 
   /** Returns the component of this player for video output, or null if video is not supported. */
   @Nullable
@@ -1293,11 +1201,6 @@ public interface Player {
   /**
    * Registers a listener to receive all events from the player.
    *
-   * <p>Do not register the listener additionally in individual `Player` components (such as {@link
-   * Player.AudioComponent#addAudioListener(AudioListener)}, {@link
-   * Player.VideoComponent#addVideoListener(VideoListener)}) as it will already receive all their
-   * events.
-   *
    * @param listener The listener to register.
    */
   void addListener(Listener listener);
@@ -1936,4 +1839,21 @@ public interface Player {
    * playing, the returned position is the same as that returned by {@link #getBufferedPosition()}.
    */
   long getContentBufferedPosition();
+
+  /** Returns the attributes for audio playback. */
+  AudioAttributes getAudioAttributes();
+
+  /**
+   * Sets the audio volume, with 0 being silence and 1 being unity gain (signal unchanged).
+   *
+   * @param audioVolume Linear output gain to apply to all audio channels.
+   */
+  void setVolume(float audioVolume);
+
+  /**
+   * Returns the audio volume, with 0 being silence and 1 being unity gain (signal unchanged).
+   *
+   * @return The linear gain applied to all audio channels.
+   */
+  float getVolume();
 }

library/common/src/main/java/com/google/android/exoplayer2/metadata/MetadataOutput.java

@@ -15,9 +15,7 @@
  */
 package com.google.android.exoplayer2.metadata;
 
-/**
- * Receives metadata output.
- */
+/** Receives metadata output. */
 public interface MetadataOutput {
 
   /**
@@ -26,5 +24,4 @@ public interface MetadataOutput {
    * @param metadata The metadata.
    */
   void onMetadata(Metadata metadata);
-
 }

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

@@ -21,8 +21,11 @@ import android.os.Looper;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 import com.google.android.exoplayer2.analytics.AnalyticsCollector;
+import com.google.android.exoplayer2.audio.AudioAttributes;
 import com.google.android.exoplayer2.audio.AudioCapabilities;
+import com.google.android.exoplayer2.audio.AudioListener;
 import com.google.android.exoplayer2.audio.AudioSink;
+import com.google.android.exoplayer2.audio.AuxEffectInfo;
 import com.google.android.exoplayer2.audio.DefaultAudioSink;
 import com.google.android.exoplayer2.audio.MediaCodecAudioRenderer;
 import com.google.android.exoplayer2.metadata.MetadataRenderer;
@@ -126,6 +129,95 @@ import java.util.List;
  */
 public interface ExoPlayer extends Player {
 
+  /** The audio component of an {@link ExoPlayer}. */
+  interface AudioComponent {
+
+    /**
+     * Adds a listener to receive audio events.
+     *
+     * @param listener The listener to register.
+     */
+    void addAudioListener(AudioListener listener);
+
+    /**
+     * Removes a listener of audio events.
+     *
+     * @param listener The listener to unregister.
+     */
+    void removeAudioListener(AudioListener listener);
+
+    /**
+     * Sets the attributes for audio playback, used by the underlying audio track. If not set, the
+     * default audio attributes will be used. They are suitable for general media playback.
+     *
+     * <p>Setting the audio attributes during playback may introduce a short gap in audio output as
+     * the audio track is recreated. A new audio session id will also be generated.
+     *
+     * <p>If tunneling is enabled by the track selector, the specified audio attributes will be
+     * ignored, but they will take effect if audio is later played without tunneling.
+     *
+     * <p>If the device is running a build before platform API version 21, audio attributes cannot
+     * be set directly on the underlying audio track. In this case, the usage will be mapped onto an
+     * equivalent stream type using {@link Util#getStreamTypeForAudioUsage(int)}.
+     *
+     * <p>If audio focus should be handled, the {@link AudioAttributes#usage} must be {@link
+     * C#USAGE_MEDIA} or {@link C#USAGE_GAME}. Other usages will throw an {@link
+     * IllegalArgumentException}.
+     *
+     * @param audioAttributes The attributes to use for audio playback.
+     * @param handleAudioFocus True if the player should handle audio focus, false otherwise.
+     */
+    void setAudioAttributes(AudioAttributes audioAttributes, boolean handleAudioFocus);
+
+    /** Returns the attributes for audio playback. */
+    AudioAttributes getAudioAttributes();
+
+    /**
+     * Sets the ID of the audio session to attach to the underlying {@link
+     * android.media.AudioTrack}.
+     *
+     * <p>The audio session ID can be generated using {@link C#generateAudioSessionIdV21(Context)}
+     * for API 21+.
+     *
+     * @param audioSessionId The audio session ID, or {@link C#AUDIO_SESSION_ID_UNSET} if it should
+     *     be generated by the framework.
+     */
+    void setAudioSessionId(int audioSessionId);
+
+    /** Returns the audio session identifier, or {@link C#AUDIO_SESSION_ID_UNSET} if not set. */
+    int getAudioSessionId();
+
+    /** Sets information on an auxiliary audio effect to attach to the underlying audio track. */
+    void setAuxEffectInfo(AuxEffectInfo auxEffectInfo);
+
+    /** Detaches any previously attached auxiliary audio effect from the underlying audio track. */
+    void clearAuxEffectInfo();
+
+    /**
+     * Sets the audio volume, with 0 being silence and 1 being unity gain (signal unchanged).
+     *
+     * @param audioVolume Linear output gain to apply to all audio channels.
+     */
+    void setVolume(float audioVolume);
+
+    /**
+     * Returns the audio volume, with 0 being silence and 1 being unity gain (signal unchanged).
+     *
+     * @return The linear gain applied to all audio channels.
+     */
+    float getVolume();
+
+    /**
+     * Sets whether skipping silences in the audio stream is enabled.
+     *
+     * @param skipSilenceEnabled Whether skipping silences in the audio stream is enabled.
+     */
+    void setSkipSilenceEnabled(boolean skipSilenceEnabled);
+
+    /** Returns whether skipping silences in the audio stream is enabled. */
+    boolean getSkipSilenceEnabled();
+  }
+
   /**
    * The default timeout for calls to {@link #release} and {@link #setForegroundMode}, in
    * milliseconds.
@@ -465,6 +557,10 @@ public interface ExoPlayer extends Player {
     }
   }
 
+  /** Returns the component of this player for audio output, or null if audio is not supported. */
+  @Nullable
+  AudioComponent getAudioComponent();
+
   /**
    * Adds a listener to receive audio offload events.
    *

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

@@ -28,6 +28,7 @@ import android.util.Pair;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.PlayerMessage.Target;
 import com.google.android.exoplayer2.analytics.AnalyticsCollector;
+import com.google.android.exoplayer2.audio.AudioAttributes;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.source.MediaSource;
 import com.google.android.exoplayer2.source.MediaSource.MediaPeriodId;
@@ -985,6 +986,22 @@ import java.util.concurrent.CopyOnWriteArraySet;
     return playbackInfo.timeline;
   }
 
+  /** This method is not supported and returns {@link AudioAttributes#DEFAULT}. */
+  @Override
+  public AudioAttributes getAudioAttributes() {
+    return AudioAttributes.DEFAULT;
+  }
+
+  /** This method is not supported and does nothing. */
+  @Override
+  public void setVolume(float audioVolume) {}
+
+  /** This method is not supported and returns 1. */
+  @Override
+  public float getVolume() {
+    return 1;
+  }
+
   private int getCurrentWindowIndexInternal() {
     if (playbackInfo.timeline.isEmpty()) {
       return maskingWindowIndex;

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

@@ -78,7 +78,7 @@ import java.util.concurrent.TimeoutException;
  */
 public class SimpleExoPlayer extends BasePlayer
     implements ExoPlayer,
-        Player.AudioComponent,
+        ExoPlayer.AudioComponent,
         Player.VideoComponent,
         Player.TextComponent,
         Player.MetadataComponent,
@@ -676,6 +676,7 @@ public class SimpleExoPlayer extends BasePlayer
       Commands additionalPermanentAvailableCommands =
           new Commands.Builder()
               .addAll(
+                  COMMAND_GET_AUDIO_ATTRIBUTES,
                   COMMAND_GET_VOLUME,
                   COMMAND_GET_DEVICE_VOLUME,
                   COMMAND_SET_VOLUME,

library/core/src/test/java/com/google/android/exoplayer2/ExoPlayerTest.java

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2;
 
 import static com.google.android.exoplayer2.Player.COMMAND_ADJUST_DEVICE_VOLUME;
 import static com.google.android.exoplayer2.Player.COMMAND_CHANGE_MEDIA_ITEMS;
+import static com.google.android.exoplayer2.Player.COMMAND_GET_AUDIO_ATTRIBUTES;
 import static com.google.android.exoplayer2.Player.COMMAND_GET_CURRENT_MEDIA_ITEM;
 import static com.google.android.exoplayer2.Player.COMMAND_GET_DEVICE_VOLUME;
 import static com.google.android.exoplayer2.Player.COMMAND_GET_MEDIA_ITEMS;
@@ -8086,6 +8087,7 @@ public final class ExoPlayerTest {
     assertThat(player.isCommandAvailable(COMMAND_GET_MEDIA_ITEMS)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_GET_MEDIA_ITEMS_METADATA)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_CHANGE_MEDIA_ITEMS)).isTrue();
+    assertThat(player.isCommandAvailable(COMMAND_GET_AUDIO_ATTRIBUTES)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_GET_VOLUME)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_GET_DEVICE_VOLUME)).isTrue();
     assertThat(player.isCommandAvailable(COMMAND_SET_VOLUME)).isTrue();
@@ -10275,6 +10277,7 @@ public final class ExoPlayerTest {
         COMMAND_GET_MEDIA_ITEMS,
         COMMAND_GET_MEDIA_ITEMS_METADATA,
         COMMAND_CHANGE_MEDIA_ITEMS,
+        COMMAND_GET_AUDIO_ATTRIBUTES,
         COMMAND_GET_VOLUME,
         COMMAND_GET_DEVICE_VOLUME,
         COMMAND_SET_VOLUME,

testutils/src/main/java/com/google/android/exoplayer2/testutil/StubExoPlayer.java

@@ -27,6 +27,7 @@ import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.PlayerMessage;
 import com.google.android.exoplayer2.SeekParameters;
 import com.google.android.exoplayer2.Timeline;
+import com.google.android.exoplayer2.audio.AudioAttributes;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.source.MediaSource;
 import com.google.android.exoplayer2.source.ShuffleOrder;
@@ -422,6 +423,21 @@ public class StubExoPlayer extends BasePlayer implements ExoPlayer {
     throw new UnsupportedOperationException();
   }
 
+  @Override
+  public AudioAttributes getAudioAttributes() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void setVolume(float audioVolume) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public float getVolume() {
+    throw new UnsupportedOperationException();
+  }
+
   @Override
   public void setForegroundMode(boolean foregroundMode) {
     throw new UnsupportedOperationException();