Call stop() to fully play out remaining audio!

Issue: #707

extensions/opus/src/main/java/com/google/android/exoplayer/ext/opus/LibopusAudioTrackRenderer.java

@@ -212,6 +212,7 @@ public final class LibopusAudioTrackRenderer extends SampleSourceTrackRenderer
 
     if (outputBuffer.getFlag(OpusDecoderWrapper.FLAG_END_OF_STREAM)) {
       outputStreamEnded = true;
+      audioTrack.handleEndOfStream();
       decoder.releaseOutputBuffer(outputBuffer);
       outputBuffer = null;
       return;
@@ -304,8 +305,7 @@ public final class LibopusAudioTrackRenderer extends SampleSourceTrackRenderer
 
   @Override
   protected boolean isEnded() {
-    return outputStreamEnded && (!audioTrack.hasPendingData()
-        || !audioTrack.hasEnoughDataToBeginPlayback());
+    return outputStreamEnded && !audioTrack.hasPendingData();
   }
 
   @Override

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

@@ -265,10 +265,7 @@ public class MediaCodecAudioTrackRenderer extends MediaCodecTrackRenderer implem
 
   @Override
   protected boolean isEnded() {
-    // We've exhausted the output stream, and the AudioTrack has either played all of the data
-    // submitted, or has been fed insufficient data to begin playback.
-    return super.isEnded() && (!audioTrack.hasPendingData()
-        || !audioTrack.hasEnoughDataToBeginPlayback());
+    return super.isEnded() && !audioTrack.hasPendingData();
   }
 
   @Override
@@ -366,6 +363,11 @@ public class MediaCodecAudioTrackRenderer extends MediaCodecTrackRenderer implem
     return false;
   }
 
+  @Override
+  protected void onOutputStreamEnded() {
+    audioTrack.handleEndOfStream();
+  }
+
   protected void handleDiscontinuity() {
     // Do nothing
   }

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

@@ -719,6 +719,17 @@ public abstract class MediaCodecTrackRenderer extends SampleSourceTrackRenderer
     // Do nothing.
   }
 
+  /**
+   * Invoked when the output stream ends, meaning that the last output buffer has been processed
+   * and the {@link MediaCodec#BUFFER_FLAG_END_OF_STREAM} flag has been propagated through the
+   * decoder.
+   * <p>
+   * The default implementation is a no-op.
+   */
+  protected void onOutputStreamEnded() {
+    // Do nothing.
+  }
+
   /**
    * Determines whether the existing {@link MediaCodec} should be reconfigured for a new format by
    * sending codec specific initialization data at the start of the next input buffer. If true is
@@ -846,6 +857,7 @@ public abstract class MediaCodecTrackRenderer extends SampleSourceTrackRenderer
       maybeInitCodec();
     } else {
       outputStreamEnded = true;
+      onOutputStreamEnded();
     }
   }
 

library/src/main/java/com/google/android/exoplayer/audio/AudioTrack.java

@@ -562,6 +562,17 @@ public final class AudioTrack {
     return result;
   }
 
+  /**
+   * Ensures that the last data passed to {@link #handleBuffer(ByteBuffer, int, int, long)} is
+   * played out in full.
+   */
+  public void handleEndOfStream() {
+    if (audioTrack != null) {
+      // Required to ensure that the media written to the AudioTrack is played out in full.
+      audioTrack.stop();
+    }
+  }
+
   @TargetApi(21)
   private static int writeNonBlockingV21(
       android.media.AudioTrack audioTrack, ByteBuffer buffer, int size) {
@@ -575,13 +586,6 @@ public final class AudioTrack {
             || audioTrackUtil.overrideHasPendingData());
   }
 
-  /** Returns whether enough data has been supplied via {@link #handleBuffer} to begin playback. */
-  public boolean hasEnoughDataToBeginPlayback() {
-    // The value of minBufferSize can be slightly less than what's actually required for playback
-    // to start, hence the multiplication factor.
-    return submittedBytes > (minBufferSize * 3) / 2;
-  }
-
   /** Sets the playback volume. */
   public void setVolume(float volume) {
     if (this.volume != volume) {