Remove AudioDecoder from the Filter heirarchy.

media/filters/audio_renderer_base.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.
 
 // AudioRendererBase takes care of the tricky queuing work and provides simple
 // methods for subclasses to peek and poke at audio data.  In addition to
 // AudioRenderer interface methods this classes doesn't implement, subclasses
 // must also implement the following methods:
 //   OnInitialized
 //   OnStop
 //   OnRenderEndOfStream
 //
 // The general assumption is that subclasses start a callback-based audio thread
 // which needs to be filled with decoded audio data.  AudioDecoderBase provides
 // FillBuffer which handles filling the provided buffer, dequeuing items,
 // scheduling additional reads and updating the clock.  In a sense,
 // AudioRendererBase is the producer and the subclass is the consumer.
 
 #ifndef MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_
 #define MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_
 
 #include <deque>
 
 #include "base/synchronization/lock.h"
+#include "media/base/audio_decoder.h"
 #include "media/base/buffers.h"
 #include "media/base/filters.h"
 #include "media/filters/audio_renderer_algorithm_base.h"
 
 namespace media {
 
 class MEDIA_EXPORT AudioRendererBase : public AudioRenderer {
  public:
   AudioRendererBase();
   virtual ~AudioRendererBase();
 
   // Filter implementation.
   virtual void Play(const base::Closure& callback) OVERRIDE;
   virtual void Pause(const base::Closure& callback) OVERRIDE;
+  virtual void Flush(const base::Closure& callback) OVERRIDE;
   virtual void Stop(const base::Closure& callback) OVERRIDE;
-
   virtual void Seek(base::TimeDelta time, const FilterStatusCB& cb) OVERRIDE;
 
   // AudioRenderer implementation.
-  virtual void Initialize(AudioDecoder* decoder,
+  virtual void Initialize(const scoped_refptr<AudioDecoder>& decoder,
                           const PipelineStatusCB& init_callback,
                           const base::Closure& underflow_callback,
                           const AudioTimeCB& audio_time_cb) OVERRIDE;
   virtual bool HasEnded() OVERRIDE;
   virtual void ResumeAfterUnderflow(bool buffer_more_audio) OVERRIDE;
 
  protected:
   FRIEND_TEST_ALL_PREFIXES(AudioRendererBaseTest, EndOfStream);
   FRIEND_TEST_ALL_PREFIXES(AudioRendererBaseTest, Underflow_EndOfStream);
 
@@ skipping 106 matching lines @@
   base::TimeDelta seek_timestamp_;
 
   AudioDecoder::ReadCB read_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererBase);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_