Expose new multi-track APIs in the ExoPlayer interface + plumb

multi-track support upstream to the ChunkSource interface.

This change does not yet make use of the newly exposed APIs. This
will come in a subsequent CL.

Issue #514.

demo/src/main/java/com/google/android/exoplayer/demo/player/DemoPlayer.java

@@ -245,6 +245,7 @@ public class DemoPlayer implements ExoPlayer.Listener, ChunkSampleSource.EventLi
     pushSurface(true);
   }
 
+  @SuppressWarnings("deprecation")
   public int getTrackCount(int type) {
     return !player.getRendererHasMedia(type) ? 0 : trackNames[type].length;
   }
@@ -330,7 +331,7 @@ public class DemoPlayer implements ExoPlayer.Listener, ChunkSampleSource.EventLi
       if (trackNames[rendererIndex] == null) {
         // Convert a null trackNames to an array of suitable length.
         int trackCount = multiTrackSources[rendererIndex] != null
-            ? multiTrackSources[rendererIndex].getTrackCount() : 1;
+            ? multiTrackSources[rendererIndex].getMultiTrackCount() : 1;
         trackNames[rendererIndex] = new String[trackCount];
       }
     }
@@ -619,6 +620,7 @@ public class DemoPlayer implements ExoPlayer.Listener, ChunkSampleSource.EventLi
     }
   }
 
+  @SuppressWarnings("deprecation")
   private void pushTrackSelection(int type, boolean allowRendererEnable) {
     if (multiTrackSources == null) {
       return;

library/src/androidTest/java/com/google/android/exoplayer/dash/DashChunkSourceTest.java

@@ -101,7 +101,7 @@ public class DashChunkSourceTest extends InstrumentationTestCase {
   public void testGetSeekRangeOnVod() {
     DashChunkSource chunkSource = new DashChunkSource(generateVodMpd(), AdaptationSet.TYPE_VIDEO,
         null, null, mock(FormatEvaluator.class));
-    chunkSource.enable();
+    chunkSource.enable(0);
     TimeRange seekRange = chunkSource.getSeekRange();
 
     checkSeekRange(seekRange, 0, VOD_DURATION_MS * 1000);
@@ -394,7 +394,7 @@ public class DashChunkSourceTest extends InstrumentationTestCase {
         AdaptationSet.TYPE_VIDEO, null, mockDataSource, EVALUATOR,
         new FakeClock(AVAILABILITY_CURRENT_TIME_MS + periodStartMs), liveEdgeLatencyMs * 1000,
         AVAILABILITY_REALTIME_OFFSET_MS * 1000, false, null, null);
-    chunkSource.enable();
+    chunkSource.enable(0);
     return chunkSource;
   }
 

library/src/main/java/com/google/android/exoplayer/ExoPlayer.java

@@ -74,7 +74,7 @@ import android.os.Looper;
  * <h3>Player state</h3>
  *
  * <p>The components of an {@link ExoPlayer}'s state can be divided into two distinct groups. State
- * accessed by {@link #getRendererEnabled(int)} and {@link #getPlayWhenReady()} are only ever
+ * accessed by {@link #getSelectedTrack(int)} and {@link #getPlayWhenReady()} is only ever
  * changed by invoking the player's methods, and are never changed as a result of operations that
  * have been performed asynchronously by the playback thread. In contrast, the playback state
  * accessed by {@link #getPlaybackState()} is only ever changed as a result of operations
@@ -219,6 +219,18 @@ public interface ExoPlayer {
    * The player has finished playing the media.
    */
   public static final int STATE_ENDED = 5;
+
+  /**
+   * A value that can be passed as the second argument to {@link #setSelectedTrack(int, int)} to
+   * disable the renderer.
+   */
+  public static final int TRACK_DISABLED = -1;
+  /**
+   * A value that can be passed as the second argument to {@link #setSelectedTrack(int, int)} to
+   * select the default track.
+   */
+  public static final int TRACK_DEFAULT = 0;
+
   /**
    * Represents an unknown time or duration.
    */
@@ -266,27 +278,73 @@ public interface ExoPlayer {
    * <p>
    * Always returns false whilst the player is in the {@link #STATE_PREPARING} state.
    *
+   * @deprecated Use {@code getTrackCount(rendererIndex) > 0}.
    * @param rendererIndex The index of the renderer.
    * @return True if the renderer has media to play, false otherwise.
    */
+  @Deprecated
   public boolean getRendererHasMedia(int rendererIndex);
 
   /**
    * Sets whether the renderer at the given index is enabled.
    *
+   * @deprecated Use {@code setSelectedTrack(rendererIndex, trackIndex)}. Passing
+   *     {@link #TRACK_DEFAULT} as {@code trackIndex} is equivalent to enabling the renderer with
+   *     this method. Passing {@link #TRACK_DISABLED} is equivalent to disabling the renderer.
    * @param rendererIndex The index of the renderer.
    * @param enabled Whether the renderer at the given index should be enabled.
    */
+  @Deprecated
   public void setRendererEnabled(int rendererIndex, boolean enabled);
 
   /**
    * Whether the renderer at the given index is enabled.
    *
+   * @deprecated Use {@code getSelectedTrack(rendererIndex)}. A return value between 0 (inclusive)
+   *      and {@code getTrackCount(rendererIndex)} (exclusive) indicate the renderer is enabled. A
+   *      value outside of this range (e.g. {@link #TRACK_DISABLED}) indicates that the renderer is
+   *      disabled.
    * @param rendererIndex The index of the renderer.
    * @return Whether the renderer is enabled.
    */
+  @Deprecated
   public boolean getRendererEnabled(int rendererIndex);
 
+  /**
+   * Returns the number of tracks exposed by the specified renderer.
+   *
+   * @param rendererIndex The index of the renderer.
+   * @return The number of tracks.
+   */
+  public int getTrackCount(int rendererIndex);
+
+  /**
+   * Returns the format of a track.
+   *
+   * @param rendererIndex The index of the renderer.
+   * @param trackIndex The index of the track.
+   * @return The format of the track.
+   */
+  public MediaFormat getTrackFormat(int rendererIndex, int trackIndex);
+
+  /**
+   * Selects a track for the specified renderer.
+   *
+   * @param rendererIndex The index of the renderer.
+   * @param trackIndex The index of the track. A negative value or a value greater than or equal to
+   *     the renderer's track count will disable the renderer.
+   */
+  public void setSelectedTrack(int rendererIndex, int trackIndex);
+
+  /**
+   * Returns the index of the currently selected track for the specified renderer.
+   *
+   * @param rendererIndex The index of the renderer.
+   * @return The selected track. A negative value or a value greater than or equal to the renderer's
+   *     track count indicates that the renderer is disabled.
+   */
+  public int getSelectedTrack(int rendererIndex);
+
   /**
    * Sets whether playback should proceed when {@link #getPlaybackState()} == {@link #STATE_READY}.
    * If the player is already in this state, then this method can be used to pause and resume

library/src/main/java/com/google/android/exoplayer/ExoPlayerImpl.java

@@ -96,44 +96,45 @@ import java.util.concurrent.CopyOnWriteArraySet;
     internalPlayer.prepare(renderers);
   }
 
+  @Deprecated
   @Override
-  // TODO: Deprecate in ExoPlayer.
   public boolean getRendererHasMedia(int rendererIndex) {
-    return getRendererTrackCount(rendererIndex) > 0;
+    return getTrackCount(rendererIndex) > 0;
   }
 
+  @Deprecated
   @Override
-  // TODO: Deprecate in ExoPlayer.
   public void setRendererEnabled(int rendererIndex, boolean enabled) {
-    setRendererSelectedTrack(rendererIndex, enabled ? 0 : -1);
+    setSelectedTrack(rendererIndex, enabled ? ExoPlayer.TRACK_DEFAULT : ExoPlayer.TRACK_DISABLED);
+  }
+
+  @Deprecated
+  @Override
+  public boolean getRendererEnabled(int rendererIndex) {
+    int selectedTrack = getSelectedTrack(rendererIndex);
+    return 0 <= selectedTrack && selectedTrack < getTrackCount(rendererIndex);
   }
 
   @Override
-  // TODO: Deprecate in ExoPlayer.
-  public boolean getRendererEnabled(int rendererIndex) {
-    return getRendererSelectedTrack(rendererIndex) == 0;
-  }
-
-  // TODO: Expose in ExoPlayer.
-  public int getRendererTrackCount(int rendererIndex) {
+  public int getTrackCount(int rendererIndex) {
     return trackFormats[rendererIndex] != null ? trackFormats[rendererIndex].length : 0;
   }
 
-  // TODO: Expose in ExoPlayer.
-  public MediaFormat getRendererTrackInfo(int rendererIndex, int trackIndex) {
+  @Override
+  public MediaFormat getTrackFormat(int rendererIndex, int trackIndex) {
     return trackFormats[rendererIndex][trackIndex];
   }
 
-  // TODO: Expose in ExoPlayer.
-  public void setRendererSelectedTrack(int rendererIndex, int trackIndex) {
+  @Override
+  public void setSelectedTrack(int rendererIndex, int trackIndex) {
     if (selectedTrackIndices[rendererIndex] != trackIndex) {
       selectedTrackIndices[rendererIndex] = trackIndex;
       internalPlayer.setRendererSelectedTrack(rendererIndex, trackIndex);
     }
   }
 
-  // TODO: Expose in ExoPlayer.
-  public int getRendererSelectedTrack(int rendererIndex) {
+  @Override
+  public int getSelectedTrack(int rendererIndex) {
     return selectedTrackIndices[rendererIndex];
   }
 

library/src/main/java/com/google/android/exoplayer/chunk/ChunkSampleSource.java

@@ -81,6 +81,7 @@ public class ChunkSampleSource implements SampleSource, SampleSourceReader, Load
   private Loader loader;
   private boolean loadingFinished;
   private IOException currentLoadableException;
+  private int enabledTrackCount;
   private int currentLoadableExceptionCount;
   private long currentLoadableExceptionTimestamp;
   private long currentLoadStartTimeMs;
@@ -131,7 +132,7 @@ public class ChunkSampleSource implements SampleSource, SampleSourceReader, Load
     if (state == STATE_PREPARED) {
       return true;
     }
-    loader = new Loader("Loader:" + chunkSource.getFormat().mimeType);
+    loader = new Loader("Loader:" + chunkSource.getFormat(0).mimeType);
     state = STATE_PREPARED;
     return true;
   }
@@ -139,22 +140,21 @@ public class ChunkSampleSource implements SampleSource, SampleSourceReader, Load
   @Override
   public int getTrackCount() {
     Assertions.checkState(state == STATE_PREPARED || state == STATE_ENABLED);
-    return 1;
+    return chunkSource.getTrackCount();
   }
 
   @Override
   public MediaFormat getFormat(int track) {
     Assertions.checkState(state == STATE_PREPARED || state == STATE_ENABLED);
-    Assertions.checkState(track == 0);
-    return chunkSource.getFormat();
+    return chunkSource.getFormat(track);
   }
 
   @Override
   public void enable(int track, long positionUs) {
     Assertions.checkState(state == STATE_PREPARED);
-    Assertions.checkState(track == 0);
+    Assertions.checkState(enabledTrackCount++ == 0);
     state = STATE_ENABLED;
-    chunkSource.enable();
+    chunkSource.enable(track);
     loadControl.register(this, bufferSizeContribution);
     downstreamFormat = null;
     downstreamMediaFormat = null;
@@ -167,7 +167,7 @@ public class ChunkSampleSource implements SampleSource, SampleSourceReader, Load
   @Override
   public void disable(int track) {
     Assertions.checkState(state == STATE_ENABLED);
-    Assertions.checkState(track == 0);
+    Assertions.checkState(--enabledTrackCount == 0);
     state = STATE_PREPARED;
     try {
       chunkSource.disable(mediaChunks);
@@ -187,7 +187,6 @@ public class ChunkSampleSource implements SampleSource, SampleSourceReader, Load
   @Override
   public boolean continueBuffering(int track, long positionUs) {
     Assertions.checkState(state == STATE_ENABLED);
-    Assertions.checkState(track == 0);
     downstreamPositionUs = positionUs;
     chunkSource.continueBuffering(positionUs);
     updateLoadControl();
@@ -198,7 +197,6 @@ public class ChunkSampleSource implements SampleSource, SampleSourceReader, Load
   public int readData(int track, long positionUs, MediaFormatHolder formatHolder,
       SampleHolder sampleHolder, boolean onlyReadDiscontinuity) {
     Assertions.checkState(state == STATE_ENABLED);
-    Assertions.checkState(track == 0);
     downstreamPositionUs = positionUs;
 
     if (pendingDiscontinuity) {

library/src/main/java/com/google/android/exoplayer/chunk/ChunkSource.java

@@ -31,13 +31,21 @@ import java.util.List;
 public interface ChunkSource {
 
   /**
-   * Gets the format.
+   * Returns the number of tracks exposed by the source.
+   *
+   * @return The number of tracks.
+   */
+  int getTrackCount();
+
+  /**
+   * Gets the format of the specified track.
    * <p>
    * May be called when the source is disabled or enabled.
    *
-   * @return The format.
+   * @param track The track index.
+   * @return The format of the track.
    */
-  MediaFormat getFormat();
+  MediaFormat getFormat(int track);
 
   /**
    * Adaptive video {@link ChunkSource} implementations must return a copy of the provided
@@ -52,8 +60,10 @@ public interface ChunkSource {
 
   /**
    * Called when the source is enabled.
+   *
+   * @param track The track index.
    */
-  void enable();
+  void enable(int track);
 
   /**
    * Called when the source is disabled.

library/src/main/java/com/google/android/exoplayer/chunk/MultiTrackChunkSource.java

@@ -27,6 +27,8 @@ import java.util.List;
  * A {@link ChunkSource} providing the ability to switch between multiple other {@link ChunkSource}
  * instances.
  */
+// TODO: Expose multiple tracks directly in DashChunkSource and SmoothStreamingChunkSource, and
+// delete this class.
 public final class MultiTrackChunkSource implements ChunkSource, ExoPlayerComponent {
 
   /**
@@ -55,18 +57,23 @@ public final class MultiTrackChunkSource implements ChunkSource, ExoPlayerCompon
    *
    * @return The number of tracks.
    */
-  public int getTrackCount() {
+  public int getMultiTrackCount() {
     return allSources.length;
   }
 
   @Override
-  public MediaFormat getFormat() {
-    return selectedSource.getFormat();
+  public int getTrackCount() {
+    return selectedSource.getTrackCount();
   }
 
   @Override
-  public void enable() {
-    selectedSource.enable();
+  public MediaFormat getFormat(int track) {
+    return selectedSource.getFormat(track);
+  }
+
+  @Override
+  public void enable(int track) {
+    selectedSource.enable(track);
     enabled = true;
   }
 

library/src/main/java/com/google/android/exoplayer/chunk/SingleSampleChunkSource.java

@@ -55,7 +55,12 @@ public final class SingleSampleChunkSource implements ChunkSource {
   }
 
   @Override
-  public MediaFormat getFormat() {
+  public int getTrackCount() {
+    return 1;
+  }
+
+  @Override
+  public MediaFormat getFormat(int track) {
     return mediaFormat;
   }
 
@@ -65,7 +70,7 @@ public final class SingleSampleChunkSource implements ChunkSource {
   }
 
   @Override
-  public void enable() {
+  public void enable(int track) {
     // Do nothing.
   }
 

library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java

@@ -291,7 +291,12 @@ public class DashChunkSource implements ChunkSource {
   }
 
   @Override
-  public final MediaFormat getFormat() {
+  public int getTrackCount() {
+    return 1;
+  }
+
+  @Override
+  public final MediaFormat getFormat(int track) {
     return mediaFormat;
   }
 
@@ -301,7 +306,7 @@ public class DashChunkSource implements ChunkSource {
   }
 
   @Override
-  public void enable() {
+  public void enable(int track) {
     fatalError = null;
     formatEvaluator.enable();
     if (manifestFetcher != null) {

library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java

@@ -187,12 +187,17 @@ public class SmoothStreamingChunkSource implements ChunkSource {
   }
 
   @Override
-  public final MediaFormat getFormat() {
+  public int getTrackCount() {
+    return 1;
+  }
+
+  @Override
+  public final MediaFormat getFormat(int track) {
     return mediaFormat;
   }
 
   @Override
-  public void enable() {
+  public void enable(int track) {
     fatalError = null;
     formatEvaluator.enable();
     if (manifestFetcher != null) {