Add support for external video renderers in mojo.

media/mojo/services/mojo_demuxer_stream_adapter.h

 // Copyright 2014 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.
 
 #ifndef MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_
 #define MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_
 
 #include <queue>
 
 #include "base/memory/weak_ptr.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/video_decoder_config.h"
 #include "media/mojo/interfaces/demuxer_stream.mojom.h"
 
 namespace media {
 
-// This class acts as a MojoRendererService-side stub for a real
-// media::DemuxerStream that is part of a media::Pipeline in a remote
-// application. Roughly speaking, it takes a mojo::DemuxerStreamPtr and exposes
-// it as a media::DemuxerStream for use by media components.
-class MojoDemuxerStreamAdapter : public media::DemuxerStream,
+// This class acts as a MojoRendererService-side stub for a real DemuxerStream
+// that is part of a Pipeline in a remote application. Roughly speaking, it
+// takes a mojo::DemuxerStreamPtr and exposes it as a DemuxerStream for use by
+// media components.
+class MojoDemuxerStreamAdapter : public DemuxerStream,
                                  public mojo::DemuxerStreamClient {
  public:
   // |demuxer_stream| is connected to the mojo::DemuxerStream that |this| will
   //     become the client of.
   // |stream_ready_cb| will be invoked when |stream| has fully initialized
   //     and |this| is ready for use.
   // NOTE: Illegal to call any methods until |stream_ready_cb| is invoked.
   MojoDemuxerStreamAdapter(mojo::DemuxerStreamPtr demuxer_stream,
-                           const base::Closure& stream_ready_cb);
+                           const base::Closure& stream_ready_cb,
+                           DemuxerStream::Type type);
   ~MojoDemuxerStreamAdapter() override;
 
-  // media::DemuxerStream implementation.
+  // DemuxerStream implementation.
   void Read(const ReadCB& read_cb) override;
   AudioDecoderConfig audio_decoder_config() override;
   VideoDecoderConfig video_decoder_config() override;
   Type type() override;
   void EnableBitstreamConverter() override;
   bool SupportsConfigChanges() override;
   VideoRotation video_rotation() override;
 
   // mojo::DemuxerStreamClient implementation.
   void OnStreamReady(mojo::ScopedDataPipeConsumerHandle pipe) override;
   void OnAudioDecoderConfigChanged(mojo::AudioDecoderConfigPtr config) override;
+  void OnVideoDecoderConfigChanged(mojo::VideoDecoderConfigPtr config) override;
 
  private:
   // The callback from |demuxer_stream_| that a read operation has completed.
   // |read_cb| is a callback from the client who invoked Read() on |this|.
   void OnBufferReady(mojo::DemuxerStream::Status status,
                      mojo::MediaDecoderBufferPtr buffer);
 
   // See constructor for descriptions.
   mojo::DemuxerStreamPtr demuxer_stream_;
   base::Closure stream_ready_cb_;
 
   // The last ReadCB received through a call to Read().
   // Used to store the results of OnBufferReady() in the event it is called
   // with DemuxerStream::Status::kConfigChanged and we don't have an up to
   // date AudioDecoderConfig yet. In that case we can't forward the results
   // on to the caller of Read() until OnAudioDecoderConfigChanged is observed.
   DemuxerStream::ReadCB read_cb_;
 
   // The front of the queue is the current config. We pop when we observe
   // DemuxerStatus::CONFIG_CHANGED.
-  std::queue<media::AudioDecoderConfig> config_queue_;
+  std::queue<AudioDecoderConfig> audio_config_queue_;
+  std::queue<VideoDecoderConfig> video_config_queue_;
+
+  DemuxerStream::Type type_;
 
   base::WeakPtrFactory<MojoDemuxerStreamAdapter> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(MojoDemuxerStreamAdapter);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_ADAPTER_H_