Reland: Remove reference counting from media::VideoDecoder and friends.

media/filters/ffmpeg_video_decoder.h

 // Copyright (c) 2012 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_FILTERS_FFMPEG_VIDEO_DECODER_H_
 #define MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_
 
 #include <list>
 
 #include "base/callback.h"
-#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/video_decoder.h"
 
 struct AVCodecContext;
 struct AVFrame;
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace media {
 
 class DecoderBuffer;
 
 class MEDIA_EXPORT FFmpegVideoDecoder : public VideoDecoder {
  public:
   explicit FFmpegVideoDecoder(
       const scoped_refptr<base::MessageLoopProxy>& message_loop);
+  virtual ~FFmpegVideoDecoder();
 
   // VideoDecoder implementation.
   virtual void Initialize(const scoped_refptr<DemuxerStream>& stream,
                           const PipelineStatusCB& status_cb,
                           const StatisticsCB& statistics_cb) OVERRIDE;
   virtual void Read(const ReadCB& read_cb) OVERRIDE;
   virtual void Reset(const base::Closure& closure) OVERRIDE;
   virtual void Stop(const base::Closure& closure) OVERRIDE;
 
   // Callback called from within FFmpeg to allocate a buffer based on
   // the dimensions of |codec_context|. See AVCodecContext.get_buffer
   // documentation inside FFmpeg.
   int GetVideoBuffer(AVCodecContext *codec_context, AVFrame* frame);
 
- protected:
-  virtual ~FFmpegVideoDecoder();
-
  private:
   enum DecoderState {
     kUninitialized,
     kNormal,
     kFlushCodec,
     kDecodeFinished
   };
 
   // Reads from the demuxer stream and corresponding read callback.
   void ReturnFrameOrReadFromDemuxerStream();
@@ skipping 10 matching lines @@
   bool ConfigureDecoder();
 
   // Releases resources associated with |codec_context_| and |av_frame_|
   // and resets them to NULL.
   void ReleaseFFmpegResources();
 
   // Reset decoder and call |reset_cb_|.
   void DoReset();
 
   scoped_refptr<base::MessageLoopProxy> message_loop_;
+  base::WeakPtrFactory<FFmpegVideoDecoder> weak_factory_;
+  base::WeakPtr<FFmpegVideoDecoder> weak_this_;
 
   DecoderState state_;
 
   StatisticsCB statistics_cb_;
 
   ReadCB read_cb_;
   base::Closure reset_cb_;
 
   // FFmpeg structures owned by this object.
   AVCodecContext* codec_context_;
   AVFrame* av_frame_;
 
   // Pointer to the demuxer stream that will feed us compressed buffers.
   scoped_refptr<DemuxerStream> demuxer_stream_;
 
   std::list<scoped_refptr<VideoFrame> > decoded_frames_;
 
   DISALLOW_COPY_AND_ASSIGN(FFmpegVideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_FFMPEG_VIDEO_DECODER_H_