Adding microphone volume support to chrome.

media/audio/win/audio_low_latency_input_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_input_win.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "media/audio/audio_util.h"
@@ skipping 164 matching lines @@
   if (sink_) {
     sink_->OnClose(this);
     sink_ = NULL;
   }
 
   // Inform the audio manager that we have been closed. This will cause our
   // destruction.
   manager_->ReleaseInputStream(this);
 }
 
+double WASAPIAudioInputStream::GetMaxVolume() {
+  // TODO(xians): Add volume support.
+  return 0.0;
+}
+
+void WASAPIAudioInputStream::SetVolume(double volume) {
+  // TODO(xians): Add volume support.
+}
+
+double WASAPIAudioInputStream::GetVolume() {
+  // TODO(xians): Add volume support.
+  return 0.0;
+}
+
 // static
 double WASAPIAudioInputStream::HardwareSampleRate(ERole device_role) {
   base::win::ScopedCoMem<WAVEFORMATEX> audio_engine_mix_format;
   HRESULT hr = GetMixFormat(device_role, &audio_engine_mix_format);
   if (FAILED(hr))
     return 0.0;
 
   return static_cast<double>(audio_engine_mix_format->nSamplesPerSec);
 }
 
@@ skipping 331 matching lines @@
   hr = audio_client_->SetEventHandle(audio_samples_ready_event_.Get());
   if (FAILED(hr))
     return hr;
 
   // Get access to the IAudioCaptureClient interface. This interface
   // enables us to read input data from the capture endpoint buffer.
   hr = audio_client_->GetService(__uuidof(IAudioCaptureClient),
                                  audio_capture_client_.ReceiveVoid());
   return hr;
 }