Adding microphone volume support to chrome.

media/audio/win/wavein_input_win.cc

 // 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.
 
 #include "media/audio/win/wavein_input_win.h"
 
 #include <windows.h>
 #include <mmsystem.h>
 #pragma comment(lib, "winmm.lib")
 
@@ skipping 169 matching lines @@
     state_ = kStateClosed;
     wavein_ = NULL;
     FreeBuffers();
   }
   // Tell the audio manager that we have been released. This can result in
   // the manager destroying us in-place so this needs to be the last thing
   // we do on this function.
   manager_->ReleaseInputStream(this);
 }
 
+double PCMWaveInAudioInputStream::GetMaxVolume() {
+  // TODO(xians): Add volume support.
+  return 0.0;
+}
+
+void PCMWaveInAudioInputStream::SetVolume(double volume) {
+  // TODO(xians): Add volume support.
+}
+
+double PCMWaveInAudioInputStream::GetVolume() {
+  // TODO(xians): Add volume support.
+  return 0.0;
+}
+
 void PCMWaveInAudioInputStream::HandleError(MMRESULT error) {
   DLOG(WARNING) << "PCMWaveInAudio error " << error;
   callback_->OnError(this, error);
 }
 
 void PCMWaveInAudioInputStream::QueueNextPacket(WAVEHDR *buffer) {
   MMRESULT res = ::waveInAddBuffer(wavein_, buffer, sizeof(WAVEHDR));
   if (res != MMSYSERR_NOERROR)
     HandleError(res);
 }
@@ skipping 64 matching lines @@
       // waveInPrepareHeader.
       obj->QueueNextPacket(buffer);
     }
   } else if (msg == WIM_CLOSE) {
     // We can be closed before calling Start, so it is possible to have a
     // null callback at this point.
     if (obj->callback_)
       obj->callback_->OnClose(obj);
   }
 }