Switch audio synchronization from sleep() based to select() based.

media/audio/audio_parameters.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/audio_parameters.h"
 
 #include "base/logging.h"
 #include "media/base/limits.h"
 
 namespace media {
@@ skipping 71 matching lines @@
 }
 
 int AudioParameters::GetBytesPerSecond() const {
   return sample_rate_ * GetBytesPerFrame();
 }
 
 int AudioParameters::GetBytesPerFrame() const {
   return channels_ * bits_per_sample_ / 8;
 }
 
+base::TimeDelta AudioParameters::GetBufferDuration() const {
+  return base::TimeDelta::FromMicroseconds(
+      frames_per_buffer_ * base::Time::kMicrosecondsPerSecond /
+      static_cast<float>(sample_rate_));
+}
+
 void AudioParameters::SetDiscreteChannels(int channels) {
   channel_layout_ = CHANNEL_LAYOUT_DISCRETE;
   channels_ = channels;
 }
 
 }  // namespace media