Work around broken AAC decoder EoS handling on L.

SoftAAC2 would cause an exception to be thrown from
dequeueOutputBuffer/releaseOutputBuffer after queueing an end-of-stream buffer
for certain streams.

The bug was introduced in L and fixed in L MR1, so the workaround is targeted to
API 21.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=147613659

library/src/main/java/com/google/android/exoplayer2/mediacodec/MediaCodecRenderer.java

@@ -183,6 +183,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   private boolean codecNeedsAdaptationWorkaround;
   private boolean codecNeedsEosPropagationWorkaround;
   private boolean codecNeedsEosFlushWorkaround;
+  private boolean codecNeedsEosOutputExceptionWorkaround;
   private boolean codecNeedsMonoChannelCountWorkaround;
   private boolean codecNeedsAdaptationWorkaroundBuffer;
   private boolean shouldSkipAdaptationWorkaroundOutputBuffer;
@@ -342,6 +343,7 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
     codecNeedsAdaptationWorkaround = codecNeedsAdaptationWorkaround(codecName);
     codecNeedsEosPropagationWorkaround = codecNeedsEosPropagationWorkaround(codecName);
     codecNeedsEosFlushWorkaround = codecNeedsEosFlushWorkaround(codecName);
+    codecNeedsEosOutputExceptionWorkaround = codecNeedsEosOutputExceptionWorkaround(codecName);
     codecNeedsMonoChannelCountWorkaround = codecNeedsMonoChannelCountWorkaround(codecName, format);
     try {
       long codecInitializingTimestamp = SystemClock.elapsedRealtime();
@@ -513,7 +515,6 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
     codecNeedsAdaptationWorkaroundBuffer = false;
     shouldSkipAdaptationWorkaroundOutputBuffer = false;
     if (codecNeedsFlushWorkaround || (codecNeedsEosFlushWorkaround && codecReceivedEos)) {
-      // Workaround framework bugs. See [Internal: b/8347958, b/8578467, b/8543366, b/23361053].
       releaseCodec();
       maybeInitCodec();
     } else if (codecReinitializationState != REINITIALIZATION_STATE_NONE) {
@@ -867,7 +868,22 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   private boolean drainOutputBuffer(long positionUs, long elapsedRealtimeUs)
       throws ExoPlaybackException {
     if (outputIndex < 0) {
-      outputIndex = codec.dequeueOutputBuffer(outputBufferInfo, getDequeueOutputBufferTimeoutUs());
+      if (codecNeedsEosOutputExceptionWorkaround && codecReceivedEos) {
+        try {
+          outputIndex = codec.dequeueOutputBuffer(outputBufferInfo,
+              getDequeueOutputBufferTimeoutUs());
+        } catch (IllegalStateException e) {
+          processEndOfStream();
+          if (outputStreamEnded) {
+            // Release the codec, as it's in an error state.
+            releaseCodec();
+          }
+          return false;
+        }
+      } else {
+        outputIndex = codec.dequeueOutputBuffer(outputBufferInfo,
+            getDequeueOutputBufferTimeoutUs());
+      }
       if (outputIndex >= 0) {
         // We've dequeued a buffer.
         if (shouldSkipAdaptationWorkaroundOutputBuffer) {
@@ -906,9 +922,27 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
       }
     }
 
-    if (processOutputBuffer(positionUs, elapsedRealtimeUs, codec, outputBuffers[outputIndex],
-        outputIndex, outputBufferInfo.flags, outputBufferInfo.presentationTimeUs,
-        shouldSkipOutputBuffer)) {
+    boolean processedOutputBuffer;
+    if (codecNeedsEosOutputExceptionWorkaround && codecReceivedEos) {
+      try {
+        processedOutputBuffer = processOutputBuffer(positionUs, elapsedRealtimeUs, codec,
+            outputBuffers[outputIndex], outputIndex, outputBufferInfo.flags,
+            outputBufferInfo.presentationTimeUs, shouldSkipOutputBuffer);
+      } catch (IllegalStateException e) {
+        processEndOfStream();
+        if (outputStreamEnded) {
+          // Release the codec, as it's in an error state.
+          releaseCodec();
+        }
+        return false;
+      }
+    } else {
+      processedOutputBuffer = processOutputBuffer(positionUs, elapsedRealtimeUs, codec,
+          outputBuffers[outputIndex], outputIndex, outputBufferInfo.flags,
+          outputBufferInfo.presentationTimeUs, shouldSkipOutputBuffer);
+    }
+
+    if (processedOutputBuffer) {
       onProcessedOutputBuffer(outputBufferInfo.presentationTimeUs);
       outputIndex = C.INDEX_UNSET;
       return true;
@@ -1010,6 +1044,8 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
    * <p>
    * If true is returned, the renderer will work around the issue by releasing the decoder and
    * instantiating a new one rather than flushing the current instance.
+   * <p>
+   * See [Internal: b/8347958, b/8543366].
    *
    * @param name The name of the decoder.
    * @return True if the decoder is known to fail when flushed.
@@ -1079,6 +1115,8 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
    * <p>
    * If true is returned, the renderer will work around the issue by instantiating a new decoder
    * when this case occurs.
+   * <p>
+   * See [Internal: b/8578467, b/23361053].
    *
    * @param name The name of the decoder.
    * @return True if the decoder is known to behave incorrectly if flushed after receiving an input
@@ -1092,6 +1130,21 @@ public abstract class MediaCodecRenderer extends BaseRenderer {
   }
 
   /**
+   * Returns whether the decoder may throw an {@link IllegalStateException} from
+   * {@link MediaCodec#dequeueOutputBuffer(MediaCodec.BufferInfo, long)} or
+   * {@link MediaCodec#releaseOutputBuffer(int, boolean)} after receiving an input
+   * buffer with {@link MediaCodec#BUFFER_FLAG_END_OF_STREAM} set.
+   * <p>
+   * See [Internal: b/17933838].
+   *
+   * @param name The name of the decoder.
+   * @return True if the decoder may throw an exception after receiving an end-of-stream buffer.
+   */
+  private static boolean codecNeedsEosOutputExceptionWorkaround(String name) {
+    return Util.SDK_INT == 21 && "OMX.google.aac.decoder".equals(name);
+  }
+
+  /**
    * Returns whether the decoder is known to set the number of audio channels in the output format
    * to 2 for the given input format, whilst only actually outputting a single channel.
    * <p>