Add initial AC3 passthrough support.

demo/src/main/java/com/google/android/exoplayer/demo/full/FullPlayerActivity.java

@@ -17,6 +17,8 @@ package com.google.android.exoplayer.demo.full;
 
 import com.google.android.exoplayer.ExoPlayer;
 import com.google.android.exoplayer.VideoSurfaceView;
+import com.google.android.exoplayer.audio.AudioCapabilities;
+import com.google.android.exoplayer.audio.AudioCapabilitiesReceiver;
 import com.google.android.exoplayer.demo.DemoUtil;
 import com.google.android.exoplayer.demo.R;
 import com.google.android.exoplayer.demo.full.player.DashRendererBuilder;
@@ -59,7 +61,7 @@ import android.widget.Toast;
  * An activity that plays media using {@link DemoPlayer}.
  */
 public class FullPlayerActivity extends Activity implements SurfaceHolder.Callback, OnClickListener,
-    DemoPlayer.Listener, DemoPlayer.TextListener {
+    DemoPlayer.Listener, DemoPlayer.TextListener, AudioCapabilitiesReceiver.Listener {
 
   private static final float CAPTION_LINE_HEIGHT_RATIO = 0.0533f;
   private static final int MENU_GROUP_TRACKS = 1;
@@ -89,6 +91,9 @@ public class FullPlayerActivity extends Activity implements SurfaceHolder.Callba
   private int contentType;
   private String contentId;
 
+  private AudioCapabilitiesReceiver audioCapabilitiesReceiver;
+  private AudioCapabilities audioCapabilities;
+
   // Activity lifecycle
 
   @Override
@@ -112,6 +117,8 @@ public class FullPlayerActivity extends Activity implements SurfaceHolder.Callba
       }
     });
 
+    audioCapabilitiesReceiver = new AudioCapabilitiesReceiver(getApplicationContext(), this);
+
     shutterView = findViewById(R.id.shutter);
     debugRootView = findViewById(R.id.controls_root);
 
@@ -137,7 +144,9 @@ public class FullPlayerActivity extends Activity implements SurfaceHolder.Callba
   public void onResume() {
     super.onResume();
     configureSubtitleView();
-    preparePlayer();
+
+    // The player will be prepared on receiving audio capabilities.
+    audioCapabilitiesReceiver.register();
   }
 
   @Override
@@ -148,6 +157,8 @@ public class FullPlayerActivity extends Activity implements SurfaceHolder.Callba
     } else {
       player.blockingClearSurface();
     }
+
+    audioCapabilitiesReceiver.unregister();
   }
 
   @Override
@@ -166,6 +177,17 @@ public class FullPlayerActivity extends Activity implements SurfaceHolder.Callba
     }
   }
 
+  // AudioCapabilitiesReceiver.Listener methods
+
+  @Override
+  public void onAudioCapabilitiesChanged(AudioCapabilities audioCapabilities) {
+    this.audioCapabilities = audioCapabilities;
+    releasePlayer();
+
+    autoPlay = true;
+    preparePlayer();
+  }
+
   // Internal methods
 
   private RendererBuilder getRendererBuilder() {
@@ -176,7 +198,7 @@ public class FullPlayerActivity extends Activity implements SurfaceHolder.Callba
             new SmoothStreamingTestMediaDrmCallback(), debugTextView);
       case DemoUtil.TYPE_DASH:
         return new DashRendererBuilder(userAgent, contentUri.toString(), contentId,
-            new WidevineTestMediaDrmCallback(contentId), debugTextView);
+            new WidevineTestMediaDrmCallback(contentId), debugTextView, audioCapabilities);
       default:
         return new DefaultRendererBuilder(this, contentUri, debugTextView);
     }

demo/src/main/java/com/google/android/exoplayer/demo/full/player/DashRendererBuilder.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.demo.full.player;
 
+import com.google.android.exoplayer.Ac3PassthroughAudioTrackRenderer;
 import com.google.android.exoplayer.DefaultLoadControl;
 import com.google.android.exoplayer.LoadControl;
 import com.google.android.exoplayer.MediaCodecAudioTrackRenderer;
@@ -22,6 +23,7 @@ import com.google.android.exoplayer.MediaCodecUtil;
 import com.google.android.exoplayer.MediaCodecVideoTrackRenderer;
 import com.google.android.exoplayer.SampleSource;
 import com.google.android.exoplayer.TrackRenderer;
+import com.google.android.exoplayer.audio.AudioCapabilities;
 import com.google.android.exoplayer.chunk.ChunkSampleSource;
 import com.google.android.exoplayer.chunk.ChunkSource;
 import com.google.android.exoplayer.chunk.Format;
@@ -84,18 +86,20 @@ public class DashRendererBuilder implements RendererBuilder,
   private final String contentId;
   private final MediaDrmCallback drmCallback;
   private final TextView debugTextView;
+  private final AudioCapabilities audioCapabilities;
 
   private DemoPlayer player;
   private RendererBuilderCallback callback;
   private ManifestFetcher<MediaPresentationDescription> manifestFetcher;
 
   public DashRendererBuilder(String userAgent, String url, String contentId,
-      MediaDrmCallback drmCallback, TextView debugTextView) {
+      MediaDrmCallback drmCallback, TextView debugTextView, AudioCapabilities audioCapabilities) {
     this.userAgent = userAgent;
     this.url = url;
     this.contentId = contentId;
     this.drmCallback = drmCallback;
     this.debugTextView = debugTextView;
+    this.audioCapabilities = audioCapabilities;
   }
 
   @Override
@@ -208,6 +212,7 @@ public class DashRendererBuilder implements RendererBuilder,
     }
 
     // Build the audio chunk sources.
+    boolean haveAc3Tracks = false;
     List<ChunkSource> audioChunkSourceList = new ArrayList<ChunkSource>();
     List<String> audioTrackNameList = new ArrayList<String>();
     if (audioAdaptationSet != null) {
@@ -220,6 +225,19 @@ public class DashRendererBuilder implements RendererBuilder,
             format.audioSamplingRate + "Hz)");
         audioChunkSourceList.add(new DashChunkSource(manifestFetcher, audioAdaptationSetIndex,
             new int[] {i}, audioDataSource, audioEvaluator, LIVE_EDGE_LATENCY_MS));
+        haveAc3Tracks |= format.mimeType.equals(MimeTypes.AUDIO_AC3)
+            || format.mimeType.equals(MimeTypes.AUDIO_EC3);
+      }
+      // Filter out non-AC-3 tracks if there is an AC-3 track, to avoid having to switch renderers.
+      if (haveAc3Tracks) {
+        for (int i = audioRepresentations.size() - 1; i >= 0; i--) {
+          Format format = audioRepresentations.get(i).format;
+          if (!format.mimeType.equals(MimeTypes.AUDIO_AC3)
+              && !format.mimeType.equals(MimeTypes.AUDIO_EC3)) {
+            audioTrackNameList.remove(i);
+            audioChunkSourceList.remove(i);
+          }
+        }
       }
     }
 
@@ -238,8 +256,16 @@ public class DashRendererBuilder implements RendererBuilder,
       SampleSource audioSampleSource = new ChunkSampleSource(audioChunkSource, loadControl,
           AUDIO_BUFFER_SEGMENTS * BUFFER_SEGMENT_SIZE, true, mainHandler, player,
           DemoPlayer.TYPE_AUDIO);
-      audioRenderer = new MediaCodecAudioTrackRenderer(audioSampleSource, drmSessionManager, true,
-          mainHandler, player);
+      // TODO: There needs to be some logic to filter out non-AC3 tracks when selecting to use AC3.
+      boolean useAc3Passthrough = haveAc3Tracks && audioCapabilities != null
+          && (audioCapabilities.supportsAc3() || audioCapabilities.supportsEAc3());
+      if (useAc3Passthrough) {
+        audioRenderer =
+            new Ac3PassthroughAudioTrackRenderer(audioSampleSource, mainHandler, player);
+      } else {
+        audioRenderer = new MediaCodecAudioTrackRenderer(audioSampleSource, drmSessionManager, true,
+            mainHandler, player);
+      }
     }
 
     // Build the text chunk sources.

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

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.demo.full.player;
 
+import com.google.android.exoplayer.Ac3PassthroughAudioTrackRenderer;
 import com.google.android.exoplayer.DummyTrackRenderer;
 import com.google.android.exoplayer.ExoPlaybackException;
 import com.google.android.exoplayer.ExoPlayer;
@@ -45,8 +46,8 @@ import java.util.concurrent.CopyOnWriteArrayList;
  */
 public class DemoPlayer implements ExoPlayer.Listener, ChunkSampleSource.EventListener,
     DefaultBandwidthMeter.EventListener, MediaCodecVideoTrackRenderer.EventListener,
-    MediaCodecAudioTrackRenderer.EventListener, TextTrackRenderer.TextRenderer,
-    StreamingDrmSessionManager.EventListener {
+    MediaCodecAudioTrackRenderer.EventListener, Ac3PassthroughAudioTrackRenderer.EventListener,
+    TextTrackRenderer.TextRenderer, StreamingDrmSessionManager.EventListener {
 
   /**
    * Builds renderers for the player.