Refactor AudioRendererBase to use scoped_refptr<AudioDecoder>

media/filters/audio_renderer_base.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.
 
 // 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
@@ skipping 75 matching lines @@
                                int* channels_out, int* sample_rate_out,
                                int* sample_bits_out);
 
  private:
   // Helper method that schedules an asynchronous read from the decoder.
   //
   // Safe to call from any thread.
   void ScheduleRead();
 
   // Audio decoder.
-  AudioDecoder* decoder_;
+  scoped_refptr<AudioDecoder> decoder_;
 
   // Maximum queue size, configuration parameter passed in during construction.
   size_t max_queue_size_;
 
   // Queued audio data.
   typedef std::deque< scoped_refptr<Buffer> > BufferQueue;
   BufferQueue queue_;
   Lock lock_;
 
   // Remembers the amount of remaining audio data for the front buffer.
   size_t data_offset_;
 
   // Whether or not we're initialized.
   bool initialized_;
 
   // Whether or not we've stopped.
   bool stopped_;
 
   // Audio time at end of last call to FillBuffer().
   // TODO(ralphl): Update this value after seeking.
   base::TimeDelta last_fill_buffer_time_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererBase);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_RENDERER_BASE_H_