Simplify passthrough playback rate calculation.

This change also fixes pre-M DTS HD passthrough playback on NVIDIA Shield.

demo/src/main/java/com/google/android/exoplayer/demo/EventLogger.java

@@ -160,8 +160,8 @@ public class EventLogger implements DemoPlayer.Listener, DemoPlayer.InfoListener
   }
 
   @Override
-  public void onAudioTrackUnderrun(long audioTrackBufferSizeMs, long elapsedSinceLastFeedMs) {
-    printInternalError("audioTrackUnderrun [" + audioTrackBufferSizeMs + ", "
+  public void onAudioTrackUnderrun(int bufferSize, long bufferSizeMs, long elapsedSinceLastFeedMs) {
+    printInternalError("audioTrackUnderrun [" + bufferSize + ", " + bufferSizeMs + ", "
         + elapsedSinceLastFeedMs + "]", null);
   }
 

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

@@ -105,7 +105,7 @@ public class DemoPlayer implements ExoPlayer.Listener, ChunkSampleSource.EventLi
     void onRendererInitializationError(Exception e);
     void onAudioTrackInitializationError(AudioTrack.InitializationException e);
     void onAudioTrackWriteError(AudioTrack.WriteException e);
-    void onAudioTrackUnderrun(long audioTrackBufferSizeMs, long elapsedSinceLastFeedMs);
+    void onAudioTrackUnderrun(int bufferSize, long bufferSizeMs, long elapsedSinceLastFeedMs);
     void onDecoderInitializationError(DecoderInitializationException e);
     void onCryptoError(CryptoException e);
     void onLoadError(int sourceId, IOException e);
@@ -483,9 +483,9 @@ public class DemoPlayer implements ExoPlayer.Listener, ChunkSampleSource.EventLi
   }
 
   @Override
-  public void onAudioTrackUnderrun(long audioTrackBufferSizeMs, long elapsedSinceLastFeedMs) {
+  public void onAudioTrackUnderrun(int bufferSize, long bufferSizeMs, long elapsedSinceLastFeedMs) {
     if (internalErrorListener != null) {
-      internalErrorListener.onAudioTrackUnderrun(audioTrackBufferSizeMs, elapsedSinceLastFeedMs);
+      internalErrorListener.onAudioTrackUnderrun(bufferSize, bufferSizeMs, elapsedSinceLastFeedMs);
     }
   }
 

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

@@ -59,10 +59,13 @@ public class MediaCodecAudioTrackRenderer extends MediaCodecTrackRenderer implem
     /**
      * Invoked when an {@link AudioTrack} underrun occurs.
      *
-     * @param audioTrackBufferSizeMs The size of the {@link AudioTrack}'s buffer, in milliseconds.
+     * @param bufferSize The size of the {@link AudioTrack}'s buffer, in bytes.
+     * @param bufferSizeMs The size of the {@link AudioTrack}'s buffer, in milliseconds, if it is
+     *     configured for PCM output. -1 if it is configured for passthrough output, as the buffered
+     *     media can have a variable bitrate so the duration may be unknown.
      * @param elapsedSinceLastFeedMs The time since the {@link AudioTrack} was last fed data.
      */
-    void onAudioTrackUnderrun(long audioTrackBufferSizeMs, long elapsedSinceLastFeedMs);
+    void onAudioTrackUnderrun(int bufferSize, long bufferSizeMs, long elapsedSinceLastFeedMs);
 
   }
 
@@ -355,7 +358,9 @@ public class MediaCodecAudioTrackRenderer extends MediaCodecTrackRenderer implem
       audioTrackHasData = audioTrack.hasPendingData();
       if (audioTrackHadData && !audioTrackHasData && getState() == TrackRenderer.STATE_STARTED) {
         long elapsedSinceLastFeedMs = SystemClock.elapsedRealtime() - lastFeedElapsedRealtimeMs;
-        notifyAudioTrackUnderrun(audioTrack.getBufferSizeUs() / 1000, elapsedSinceLastFeedMs);
+        long bufferSizeUs = audioTrack.getBufferSizeUs();
+        long bufferSizeMs = bufferSizeUs == C.UNKNOWN_TIME_US ? -1 : bufferSizeUs / 1000;
+        notifyAudioTrackUnderrun(audioTrack.getBufferSize(), bufferSizeMs, elapsedSinceLastFeedMs);
       }
     }
 
@@ -425,13 +430,13 @@ public class MediaCodecAudioTrackRenderer extends MediaCodecTrackRenderer implem
     }
   }
 
-  private void notifyAudioTrackUnderrun(final long audioTrackBufferSizeMs,
+  private void notifyAudioTrackUnderrun(final int bufferSize, final long bufferSizeMs,
       final long elapsedSinceLastFeedMs) {
     if (eventHandler != null && eventListener != null) {
       eventHandler.post(new Runnable()  {
         @Override
         public void run() {
-          eventListener.onAudioTrackUnderrun(audioTrackBufferSizeMs, elapsedSinceLastFeedMs);
+          eventListener.onAudioTrackUnderrun(bufferSize, bufferSizeMs, elapsedSinceLastFeedMs);
         }
       });
     }

library/src/main/java/com/google/android/exoplayer/util/Ac3Util.java

@@ -17,19 +17,41 @@ package com.google.android.exoplayer.util;
 
 import com.google.android.exoplayer.MediaFormat;
 
+import java.nio.ByteBuffer;
+
 /**
  * Utility methods for parsing AC-3 headers.
  */
 public final class Ac3Util {
 
-  /** Sample rates, indexed by fscod. */
+  /**
+   * The number of new samples per (E-)AC-3 audio block.
+   */
+  private static final int SAMPLES_PER_AUDIO_BLOCK = 256;
+  /**
+   * Each syncframe has 6 blocks that provide 256 new samples. See ETSI TS 102 366 subsection 4.1.
+   */
+  private static final int AC3_SAMPLES_PER_SYNCFRAME = 6 * SAMPLES_PER_AUDIO_BLOCK;
+  /**
+   * Number of audio blocks per E-AC-3 sync frame, indexed by numblkscod.
+   */
+  private static final int[] AUDIO_BLOCKS_PER_SYNCFRAME_BY_NUMBLKSCOD = new int[] {1, 2, 3, 6};
+  /**
+   * Sample rates, indexed by fscod.
+   */
   private static final int[] SAMPLE_RATES = new int[] {48000, 44100, 32000};
-  /** Channel counts, indexed by acmod. */
+  /**
+   * Channel counts, indexed by acmod.
+   */
   private static final int[] CHANNEL_COUNTS = new int[] {2, 1, 2, 3, 3, 4, 4, 5};
-  /** Nominal bitrates in kbps, indexed by bit_rate_code. */
+  /**
+   * Nominal bitrates in kbps, indexed by bit_rate_code.
+   */
   private static final int[] BITRATES = new int[] {32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192,
       224, 256, 320, 384, 448, 512, 576, 640};
-  /** 16-bit words per sync frame, indexed by frmsizecod / 2. (See ETSI TS 102 366 table 4.13.) */
+  /**
+   * 16-bit words per sync frame, indexed by frmsizecod / 2. (See ETSI TS 102 366 table 4.13.)
+   */
   private static final int[] FRMSIZECOD_TO_FRAME_SIZE_44_1 = new int[] {69, 87, 104, 121, 139, 174,
       208, 243, 278, 348, 417, 487, 557, 696, 835, 975, 1114, 1253, 1393};
 
@@ -161,6 +183,31 @@ public final class Ac3Util {
     return (unscaledBitrate + divisor / 2) / divisor;
   }
 
+  /**
+   * Returns the number of samples per AC-3 syncframe.
+   */
+  public static int getAc3SamplesPerSyncframe() {
+    return AC3_SAMPLES_PER_SYNCFRAME;
+  }
+
+  /**
+   * Returns the number of samples per syncframe for the E-AC-3 frame in {@code buffer}.
+   *
+   * @param buffer The frame to parse.
+   * @return The number of samples per syncframe.
+   */
+  public static int parseEac3SamplesPerSyncframe(ByteBuffer buffer) {
+    // See ETSI TS 102 366 subsection E.1.2.2.
+    int audioBlocks;
+    if (((buffer.get(buffer.position() + 4) & 0xC0) >> 6) == 0x03) { // fscod
+      audioBlocks = 6;
+    } else {
+      int numblkscod = (buffer.get(buffer.position() + 4) & 0x30) >> 4;
+      audioBlocks = AUDIO_BLOCKS_PER_SYNCFRAME_BY_NUMBLKSCOD[numblkscod] * 256;
+    }
+    return audioBlocks * SAMPLES_PER_AUDIO_BLOCK;
+  }
+
   private Ac3Util() {
     // Prevent instantiation.
   }

playbacktests/src/main/java/com/google/android/exoplayer/playbacktests/util/LogcatLogger.java

@@ -105,9 +105,9 @@ public final class LogcatLogger implements ExoPlayer.Listener,
   }
 
   @Override
-  public void onAudioTrackUnderrun(long audioTrackBufferSizeMs, long elapsedSinceLastFeedMs) {
-    Log.e(tag, "Audio track underrun (" + audioTrackBufferSizeMs + ", " + elapsedSinceLastFeedMs
-        + ")");
+  public void onAudioTrackUnderrun(int bufferSize, long bufferSizeMs, long elapsedSinceLastFeedMs) {
+    Log.e(tag, "Audio track underrun (" + bufferSize + ", " + bufferSizeMs + ", "
+        + elapsedSinceLastFeedMs + ")");
   }
 
   @Override