Add a unified audio I/O backend for ChromeOS.

media/audio/cras/cras_input.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/cras/cras_input.h"
 
 #include <math.h>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 90 matching lines @@
 
 void CrasInputStream::Start(AudioInputCallback* callback) {
   DCHECK(client_);
   DCHECK(callback);
 
   // If already playing, stop before re-starting.
   if (started_)
     return;
 
   callback_ = callback;
+  LOG(ERROR) << "Input Start";
 
   // Prepare |audio_format| and |stream_params| for the stream we
   // will create.
   cras_audio_format* audio_format = cras_audio_format_create(
       alsa_util::BitsToFormat(params_.bits_per_sample()),
       params_.sample_rate(),
       params_.channels());
   if (!audio_format) {
     DLOG(WARNING) << "Error setting up audio parameters.";
     callback_->OnError(this);
@@ skipping 148 matching lines @@
 
 double CrasInputStream::GetVolumeRatioFromDecibels(double dB) const {
   return pow(10, dB / 20.0);
 }
 
 double CrasInputStream::GetDecibelsFromVolumeRatio(double volume_ratio) const {
   return 20 * log10(volume_ratio);
 }
 
 }  // namespace media