Audio software mixer.

media/audio/audio_output_proxy.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_AUDIO_AUDIO_OUTPUT_PROXY_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 35 matching lines @@
     kPlaying,
     kClosed,
     kError,
   };
 
   virtual ~AudioOutputProxy();
 
   scoped_refptr<AudioOutputDispatcher> dispatcher_;
   State state_;
 
-  // The actual audio stream. Must be set to NULL in any state other
-  // than kPlaying.
-  AudioOutputStream* physical_stream_;
-
   // Need to save volume here, so that we can restore it in case the stream
   // is stopped, and then started again.
   double volume_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputProxy);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_