Motown: Various fixes related to video playback support

services/media/framework_ffmpeg/ffmpeg_demux.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <condition_variable>
 #include <map>
 #include <mutex>
 #include <thread>
 
 #include "base/logging.h"
@@ skipping 277 matching lines @@
 
   if (av_read_frame(format_context_.get(), av_packet.get()) < 0) {
     // End of stream. Start producing end-of-stream packets for all the streams.
     next_stream_to_end_ = 0;
     return PullEndOfStreamPacket(stream_index_out);
   }
 
   *stream_index_out = static_cast<size_t>(av_packet->stream_index);
   // TODO(dalesat): What if the packet has no PTS or duration?
   next_pts_ = av_packet->pts + av_packet->duration;
+  // TODO(dalesat): Implement packet side data.
+  DCHECK(av_packet->side_data == nullptr) << "side data not implemented";
+  DCHECK(av_packet->side_data_elems == 0);
 
   return DemuxPacket::Create(std::move(av_packet));
 }
 
 PacketPtr FfmpegDemuxImpl::PullEndOfStreamPacket(size_t* stream_index_out) {
   DCHECK(next_stream_to_end_ >= 0);
 
   if (static_cast<std::size_t>(next_stream_to_end_) >= streams_.size()) {
     NOTREACHED() << "PullPacket called after all streams have ended";
     return nullptr;
@@ skipping 32 matching lines @@
   return index_;
 }
 
 std::unique_ptr<StreamType> FfmpegDemuxImpl::FfmpegDemuxStream::stream_type()
     const {
   return SafeClone(stream_type_);
 }
 
 }  // namespace media
 }  // namespace mojo