Strip private ID3 data from HLS sample formats

Issue: #5063
PiperOrigin-RevId: 222975020

RELEASENOTES.md

@@ -2,8 +2,11 @@
 
 ### dev-v2 (not yet released) ###
 
-* HLS: Fix issue causing unnecessary media playlist requests when playing live
-  streams ([#5059](https://github.com/google/ExoPlayer/issues/5059)).
+* HLS:
+  * Fix issue causing unnecessary media playlist requests when playing live
+    streams ([#5059](https://github.com/google/ExoPlayer/issues/5059)).
+  * Fix decoder re-instantiation issue for packed audio streams
+    ([#5063](https://github.com/google/ExoPlayer/issues/5063)).
 * MP4: Support Opus and FLAC in the MP4 container, and in DASH
   ([#4883](https://github.com/google/ExoPlayer/issues/4883)).
 * DASH: Fix detecting the end of live events

library/core/src/main/java/com/google/android/exoplayer2/source/SampleQueue.java

@@ -30,10 +30,8 @@ import java.io.EOFException;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 
-/**
- * A queue of media samples.
- */
-public final class SampleQueue implements TrackOutput {
+/** A queue of media samples. */
+public class SampleQueue implements TrackOutput {
 
   /**
    * A listener for changes to the upstream format.

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaChunk.java

@@ -42,7 +42,7 @@ import java.util.concurrent.atomic.AtomicInteger;
  */
 /* package */ final class HlsMediaChunk extends MediaChunk {
 
-  private static final String PRIV_TIMESTAMP_FRAME_OWNER =
+  public static final String PRIV_TIMESTAMP_FRAME_OWNER =
       "com.apple.streaming.transportStreamTimestamp";
 
   private static final AtomicInteger uidSource = new AtomicInteger();

library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsSampleStreamWrapper.java

@@ -16,6 +16,7 @@
 package com.google.android.exoplayer2.source.hls;
 
 import android.os.Handler;
+import android.support.annotation.Nullable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.FormatHolder;
@@ -24,6 +25,8 @@ import com.google.android.exoplayer2.extractor.DummyTrackOutput;
 import com.google.android.exoplayer2.extractor.ExtractorOutput;
 import com.google.android.exoplayer2.extractor.SeekMap;
 import com.google.android.exoplayer2.extractor.TrackOutput;
+import com.google.android.exoplayer2.metadata.Metadata;
+import com.google.android.exoplayer2.metadata.id3.PrivFrame;
 import com.google.android.exoplayer2.source.MediaSourceEventListener.EventDispatcher;
 import com.google.android.exoplayer2.source.SampleQueue;
 import com.google.android.exoplayer2.source.SampleQueue.UpstreamFormatChangedListener;
@@ -791,7 +794,7 @@ import java.util.List;
         return createDummyTrackOutput(id, type);
       }
     }
-    SampleQueue trackOutput = new SampleQueue(allocator);
+    SampleQueue trackOutput = new PrivTimestampStrippingSampleQueue(allocator);
     trackOutput.setSampleOffsetUs(sampleOffsetUs);
     trackOutput.sourceId(chunkUid);
     trackOutput.setUpstreamFormatChangeListener(this);
@@ -1126,4 +1129,53 @@ import java.util.List;
     Log.w(TAG, "Unmapped track with id " + id + " of type " + type);
     return new DummyTrackOutput();
   }
+
+  private static final class PrivTimestampStrippingSampleQueue extends SampleQueue {
+
+    public PrivTimestampStrippingSampleQueue(Allocator allocator) {
+      super(allocator);
+    }
+
+    @Override
+    public void format(Format format) {
+      super.format(format.copyWithMetadata(getAdjustedMetadata(format.metadata)));
+    }
+
+    /**
+     * Strips the private timestamp frame from metadata, if present. See:
+     * https://github.com/google/ExoPlayer/issues/5063
+     */
+    @Nullable
+    private Metadata getAdjustedMetadata(@Nullable Metadata metadata) {
+      if (metadata == null) {
+        return null;
+      }
+      int length = metadata.length();
+      int transportStreamTimestampMetadataIndex = C.INDEX_UNSET;
+      for (int i = 0; i < length; i++) {
+        Metadata.Entry metadataEntry = metadata.get(i);
+        if (metadataEntry instanceof PrivFrame) {
+          PrivFrame privFrame = (PrivFrame) metadataEntry;
+          if (HlsMediaChunk.PRIV_TIMESTAMP_FRAME_OWNER.equals(privFrame.owner)) {
+            transportStreamTimestampMetadataIndex = i;
+            break;
+          }
+        }
+      }
+      if (transportStreamTimestampMetadataIndex == C.INDEX_UNSET) {
+        return metadata;
+      }
+      if (length == 1) {
+        return null;
+      }
+      Metadata.Entry[] newMetadataEntries = new Metadata.Entry[length - 1];
+      for (int i = 0; i < length; i++) {
+        if (i != transportStreamTimestampMetadataIndex) {
+          int newIndex = i < transportStreamTimestampMetadataIndex ? i : i - 1;
+          newMetadataEntries[newIndex] = metadata.get(i);
+        }
+      }
+      return new Metadata(newMetadataEntries);
+    }
+  }
 }