Bug 1320705: P7. Ensure audio decoder is recreated when chaining encountered. r=gerald

The Opus decoder will error if we feed it new data if it has seen the last packet of a stream.

MozReview-Commit-ID: Kw3cZuEKxie

--HG--
extra : rebase_source : 8758ec63304677fe8ab2eeae7fc65f46de2db701

dom/media/ogg/OggDemuxer.cpp

@@ -9,6 +9,7 @@
 #include "AbstractMediaDecoder.h"
 #include "OggDemuxer.h"
 #include "OggCodecState.h"
+#include "mozilla/Atomics.h"
 #include "mozilla/PodOperations.h"
 #include "mozilla/SharedThreadPool.h"
 #include "mozilla/Telemetry.h"
@@ -50,6 +51,8 @@ static const uint32_t OGG_SEEK_FUZZ_USECS = 500000;
 // The specification recommends 80 ms.
 static const int64_t OGG_SEEK_OPUS_PREROLL = 80 * USECS_PER_MS;
 
+static Atomic<uint32_t> sStreamSourceID(0u);
+
 class OggHeaders
 {
 public:
@@ -885,6 +888,9 @@ OggDemuxer::ReadOggChain(const media::TimeUnit& aLastEndTime)
                       Move(tags),
                       nsAutoPtr<MediaInfo>(new MediaInfo(mInfo))));
     }
+    // Setup a new TrackInfo so that the MediaFormatReader will flush the
+    // current decoder.
+    mSharedAudioTrackInfo = new SharedTrackInfo(mInfo.mAudio, ++sStreamSourceID);
     return true;
   }
 
@@ -1488,6 +1494,9 @@ OggTrackDemuxer::NextSample()
   if (mQueuedSample) {
     RefPtr<MediaRawData> nextSample = mQueuedSample;
     mQueuedSample = nullptr;
+    if (mType == TrackInfo::kAudioTrack) {
+      nextSample->mTrackInfo = mParent->mSharedAudioTrackInfo;
+    }
     return nextSample;
   }
   ogg_packet* packet = mParent->GetNextPacket(mType);
@@ -1497,10 +1506,14 @@ OggTrackDemuxer::NextSample()
   // Check the eos state in case we need to look for chained streams.
   bool eos = packet->e_o_s;
   OggCodecState* state = mParent->GetTrackCodecState(mType);
-  RefPtr<MediaRawData> data = state->PacketOutAsMediaRawData();;
+  RefPtr<MediaRawData> data = state->PacketOutAsMediaRawData();
+  if (mType == TrackInfo::kAudioTrack) {
+    data->mTrackInfo = mParent->mSharedAudioTrackInfo;
+  }
   if (eos) {
     // We've encountered an end of bitstream packet; check for a chained
     // bitstream following this one.
+    // This will also update mSharedAudioTrackInfo.
     mParent->ReadOggChain(TimeUnit::FromMicroseconds(data->GetEndTime()));
   }
   return data;

dom/media/ogg/OggDemuxer.h

@@ -340,6 +340,13 @@ private:
   TimedMetadataEventProducer* mTimedMetadataEvent;
   MediaEventProducer<void>* mOnSeekableEvent;
 
+  // This will be populated only if a content change occurs, otherwise it
+  // will be left as null so the original metadata is used.
+  // It is updated once a chained ogg is encountered.
+  // As Ogg chaining is only supported for audio, we only need an audio track
+  // info.
+  RefPtr<SharedTrackInfo> mSharedAudioTrackInfo;
+
   friend class OggTrackDemuxer;
 };