Adds Analog Gain Control (AGC) to the WebRTC client.

media/audio/win/wavein_input_win.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_WIN_WAVEIN_INPUT_WIN_H_
 #define MEDIA_AUDIO_WIN_WAVEIN_INPUT_WIN_H_
 
 #include <windows.h>
 #include <mmsystem.h>
 
@@ skipping 18 matching lines @@
 
   // Implementation of AudioInputStream.
   virtual bool Open() OVERRIDE;
   virtual void Start(AudioInputCallback* callback) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void Close() OVERRIDE;
   // TODO(henrika): Add volume support using the Audio Mixer API.
   virtual double GetMaxVolume() OVERRIDE;
   virtual void SetVolume(double volume) OVERRIDE;
   virtual double GetVolume() OVERRIDE;
+  virtual void SetAutomaticGainControl(bool enabled) OVERRIDE;
+  virtual bool GetAutomaticGainControl() OVERRIDE;
 
  private:
   enum State {
     kStateEmpty,      // Initial state.
     kStateReady,      // Device obtained and ready to record.
     kStateRecording,  // Recording audio.
     kStateStopping,   // Trying to stop, waiting for callback to finish.
     kStateStopped,    // Stopped. Device was reset.
     kStateClosed      // Device has been released.
   };
@@ skipping 58 matching lines @@
   // Pointer to the first allocated audio buffer. This object owns it.
   WAVEHDR* buffer_;
 
   // An event that is signaled when the callback thread is ready to stop.
   base::win::ScopedHandle stopped_event_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMWaveInAudioInputStream);
 };
 
 #endif  // MEDIA_AUDIO_WIN_WAVEIN_INPUT_WIN_H_