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

media/audio/win/audio_low_latency_output_win.cc

 // 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.
 
 #include "media/audio/win/audio_low_latency_output_win.h"
 
 #include <Functiondiscoverykeys_devpkey.h>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 223 matching lines @@
     DLOG_IF(ERROR, FAILED(hr)) << "Failed to disable device notifications: "
                                << std::hex << hr;
   }
 
   // Inform the audio manager that we have been closed. This will cause our
   // destruction.
   manager_->ReleaseOutputStream(this);
 }
 
 void WASAPIAudioOutputStream::SetVolume(double volume) {
+  DVLOG(1) << "SetVolume(volume=" << volume << ")";
   float volume_float = static_cast<float>(volume);
   if (volume_float < 0.0f || volume_float > 1.0f) {
     return;
   }
   volume_ = volume_float;
 }
 
 void WASAPIAudioOutputStream::GetVolume(double* volume) {
+  DVLOG(1) << "GetVolume()";
   *volume = static_cast<double>(volume_);
 }
 
 // static
 int WASAPIAudioOutputStream::HardwareSampleRate(ERole device_role) {
   // It is assumed that this static method is called from a COM thread, i.e.,
   // CoInitializeEx() is not called here again to avoid STA/MTA conflicts.
   ScopedComPtr<IMMDeviceEnumerator> enumerator;
   HRESULT hr =  CoCreateInstance(__uuidof(MMDeviceEnumerator),
                                  NULL,
@@ skipping 537 matching lines @@
 
   // All released interfaces (IAudioRenderClient, IAudioClient, IMMDevice)
   // are now re-initiated and it is now possible to re-start audio rendering.
 
   // Start rendering again using the new default audio endpoint.
   hr = audio_client_->Start();
 
   restart_rendering_mode_ = false;
   return SUCCEEDED(hr);
 }