Adding microphone volume support to chrome.

media/audio/audio_io.h

 // Copyright (c) 2011 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_IO_H_
 #define MEDIA_AUDIO_AUDIO_IO_H_
 
 #include "base/basictypes.h"
 #include "media/audio/audio_buffers_state.h"
 
@@ skipping 136 matching lines @@
   virtual void Start(AudioInputCallback* callback) = 0;
 
   // Stops recording audio. Effect might not be instantaneous as there could be
   // pending audio callbacks in the queue which will be issued first before
   // recording stops.
   virtual void Stop() = 0;
 
   // Close the stream. This also generates AudioInputCallback::OnClose(). This
   // should be the last call made on this object.
   virtual void Close() = 0;
+
+  // Sets the microphone analog volume, with range [0.0, max_volume] inclusive.
+  virtual void SetMicVolume(double volume) = 0;
+
+  // Gets the microphone analog volume, with range [0.0, max_volume] inclusive.
+  virtual void GetMicVolume(double* volume) = 0;
+
+  // Gets the maximum microphone analog volume.
+  virtual void GetMaxMicVolume(double* max_volume) = 0;

[henrika (OOO until Aug 14), 2012/02/21 14:03:47]

What about moving this API up to make it more clear what max_volume is? Also, we
could use bool here instead.

[no longer working on chromium, 2012/02/21 18:01:38]

Done.

 };
 
 #endif  // MEDIA_AUDIO_AUDIO_IO_H_