Introduce AudioDecoderConfig to migrate away from GetAVStream().

media/filters/chunk_demuxer.cc

 // Copyright (c) 2011 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.
 
 // Implements a Demuxer that can switch among different data sources mid-stream.
 // Uses FFmpegDemuxer under the covers, so see the caveats at the top of
 // ffmpeg_demuxer.h.
 
 #include "media/filters/chunk_demuxer.h"
 
@@ skipping 62 matching lines @@
   void AddBuffers(const BufferQueue& buffers);
   void Shutdown();
 
   bool GetLastBufferTimestamp(base::TimeDelta* timestamp) const;
 
   // DemuxerStream methods.
   virtual void Read(const ReadCallback& read_callback);
   virtual Type type();
   virtual void EnableBitstreamConverter();
   virtual AVStream* GetAVStream();
+  virtual AudioDecoderConfig* audio_decoder_config();
 
  private:
   static void RunCallback(ReadCallback cb, scoped_refptr<Buffer> buffer);
 
   Type type_;
   AVStream* av_stream_;
+  scoped_ptr<AudioDecoderConfig> audio_config_;
 
   mutable base::Lock lock_;
   ReadCBQueue read_cbs_;
   BufferQueue buffers_;
   bool shutdown_called_;
   bool received_end_of_stream_;
 
   // Keeps track of the timestamp of the last buffer we have
   // added to |buffers_|. This is used to enforce buffers with strictly
   // monotonically increasing timestamps.
   base::TimeDelta last_buffer_timestamp_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChunkDemuxerStream);
 };
 
 ChunkDemuxerStream::ChunkDemuxerStream(Type type, AVStream* stream)
     : type_(type),
       av_stream_(stream),
       shutdown_called_(false),
       received_end_of_stream_(false),
       last_buffer_timestamp_(kNoTimestamp) {
+  if (type_ == AUDIO) {
+    audio_config_.reset(AVCodecContextToAudioDecoderConfig(stream->codec));
+  }
 }
 
 ChunkDemuxerStream::~ChunkDemuxerStream() {}
 
 void ChunkDemuxerStream::Flush() {
   VLOG(1) << "Flush()";
   base::AutoLock auto_lock(lock_);
   buffers_.clear();
   received_end_of_stream_ = false;
   last_buffer_timestamp_ = kNoTimestamp;
@@ skipping 154 matching lines @@
   DCHECK(buffer.get());
   read_callback.Run(buffer);
 }
 
 DemuxerStream::Type ChunkDemuxerStream::type() { return type_; }
 
 void ChunkDemuxerStream::EnableBitstreamConverter() {}
 
 AVStream* ChunkDemuxerStream::GetAVStream() { return av_stream_; }
 
+AudioDecoderConfig* ChunkDemuxerStream::audio_decoder_config() {
+  return audio_config_.get();
+}
+
 ChunkDemuxer::ChunkDemuxer(ChunkDemuxerClient* client)
     : state_(WAITING_FOR_INIT),
       client_(client),
       format_context_(NULL),
       buffered_bytes_(0),
       seek_waits_for_data_(true) {
   DCHECK(client);
 }
 
 ChunkDemuxer::~ChunkDemuxer() {
@@ skipping 421 matching lines @@
     base::AutoUnlock auto_unlock(lock_);
     if (cb.is_null()) {
       host()->SetError(error);
       return;
     }
     cb.Run(error);
   }
 }
 
 }  // namespace media