Adding callback support to media filter Initialize() and Seek().

media/filters/ffmpeg_demuxer.h

 // Copyright (c) 2009 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 the Demuxer interface using FFmpeg's libavformat.  At this time
 // will support demuxing any audio/video format thrown at it.  The streams
 // output mime types audio/x-ffmpeg and video/x-ffmpeg and include an integer
 // key FFmpegCodecID which contains the CodecID enumeration value.  The CodecIDs
 // can be used to create and initialize the corresponding FFmpeg decoder.
 //
@@ skipping 102 matching lines @@
   // FilterFactory provider.
   static FilterFactory* CreateFilterFactory() {
     return new FilterFactoryImpl0<FFmpegDemuxer>();
   }
 
   // Posts a task to perform additional demuxing.
   virtual void PostDemuxTask();
 
   // MediaFilter implementation.
   virtual void Stop();
-  virtual void Seek(base::TimeDelta time);
+  virtual void Seek(base::TimeDelta time, FilterCallback* callback);
 
   // Demuxer implementation.
-  virtual bool Initialize(DataSource* data_source);
+  virtual void Initialize(DataSource* data_source, FilterCallback* callback);
   virtual size_t GetNumberOfStreams();
   virtual scoped_refptr<DemuxerStream> GetStream(int stream_id);
 
  private:
   // Only allow a factory to create this class.
   friend class FilterFactoryImpl0<FFmpegDemuxer>;
   FFmpegDemuxer();
   virtual ~FFmpegDemuxer();
 
   // Carries out initialization on the demuxer thread.
-  void InititalizeTask(DataSource* data_source);
+  void InititalizeTask(DataSource* data_source, FilterCallback* callback);
 
   // Carries out a seek on the demuxer thread.
-  void SeekTask(base::TimeDelta time);
+  void SeekTask(base::TimeDelta time, FilterCallback* callback);
 
   // Carries out demuxing and satisfying stream reads on the demuxer thread.
   void DemuxTask();
 
   // Carries out stopping the demuxer streams on the demuxer thread.
   void StopTask();
 
   // Returns true if any of the streams have pending reads.  Since we lazily
   // post a DemuxTask() for every read, we use this method to quickly terminate
   // the tasks if there is no work to do.
@@ skipping 26 matching lines @@
   typedef std::vector< scoped_refptr<FFmpegDemuxerStream> > StreamVector;
   StreamVector streams_;
   StreamVector packet_streams_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_DEMUXER_H_