Improved AGC update scheme for the audio backend in Chrome

media/audio/cras/cras_input.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_CRAS_CRAS_INPUT_H_
 #define MEDIA_AUDIO_CRAS_CRAS_INPUT_H_
 
 #include <cras_client.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "media/audio/audio_input_stream_impl.h"
+#include "media/audio/agc_audio_stream.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 
 namespace media {
 
 class AudioManagerCras;
 
 // Provides an input stream for audio capture based on CRAS, the ChromeOS Audio
 // Server.  This object is not thread safe and all methods should be invoked in
 // the thread that created the object.
-class CrasInputStream : public AudioInputStreamImpl {
+class CrasInputStream : public AgcAudioStream<AudioInputStream> {
  public:
   // The ctor takes all the usual parameters, plus |manager| which is the
   // audio manager who is creating this object.
   CrasInputStream(const AudioParameters& params, AudioManagerCras* manager);
 
   // The dtor is typically called by the AudioManager only and it is usually
   // triggered by calling AudioOutputStream::Close().
   virtual ~CrasInputStream();
 
   // Implementation of AudioInputStream.
@@ skipping 58 matching lines @@
 
   // ID of the playing stream.
   cras_stream_id_t stream_id_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_CRAS_ALSA_INPUT_H_