Introduce AudioHardwareConfig for renderer side audio device info.

content/renderer/media/renderer_audio_hardware_config.cc

+// Copyright (c) 2013 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 "content/renderer/media/renderer_audio_hardware_config.h"
+
+#include "content/common/view_messages.h"
+#include "content/renderer/render_thread_impl.h"
+
+namespace content {
+
+RendererAudioHardwareConfig::RendererAudioHardwareConfig()
+    : output_buffer_size_(0),
+      output_sample_rate_(0),
+      input_sample_rate_(0),
+      input_channel_layout_(media::CHANNEL_LAYOUT_NONE) {
+  CHECK(RenderThreadImpl::current());
+  RenderThreadImpl::current()->Send(new ViewHostMsg_GetAudioHardwareConfig(

[henrika (OOO until Aug 14), 2013/01/29 10:46:49]

Is it OK to call a sync IPC from a ctor? It just feels a bit risky if you ask
me.

[DaleCurtis, 2013/01/29 19:36:00]

Why do you think it's riskier? Also what's riskier vs. calling a synchronous IPC
in each method as before?  The idea is that the object is fully constructed with
valid values and can then be safely called from any thread.

[henrika (OOO until Aug 14), 2013/01/30 10:10:06]

I am just used to always making as lightweight tasks as possible during
constructions. That's all. I see your point.

+      &output_buffer_size_, &output_sample_rate_, &input_sample_rate_,
+      &input_channel_layout_));
+}
+
+RendererAudioHardwareConfig::RendererAudioHardwareConfig(
+    int output_buffer_size, int output_sample_rate,
+    int input_sample_rate, media::ChannelLayout input_channel_layout)
+    : output_buffer_size_(output_buffer_size),
+      output_sample_rate_(output_sample_rate),
+      input_sample_rate_(input_sample_rate),
+      input_channel_layout_(input_channel_layout) {
+}
+
+RendererAudioHardwareConfig::~RendererAudioHardwareConfig() {}
+
+int RendererAudioHardwareConfig::GetOutputBufferSize() {
+  base::AutoLock auto_lock(config_lock_);
+  return output_buffer_size_;
+}
+
+int RendererAudioHardwareConfig::GetOutputSampleRate() {
+  base::AutoLock auto_lock(config_lock_);
+  return output_sample_rate_;
+}
+
+int RendererAudioHardwareConfig::GetInputSampleRate() {
+  base::AutoLock auto_lock(config_lock_);
+  return input_sample_rate_;
+}
+
+media::ChannelLayout RendererAudioHardwareConfig::GetInputChannelLayout() {
+  base::AutoLock auto_lock(config_lock_);
+  return input_channel_layout_;
+}
+
+void RendererAudioHardwareConfig::UpdateInputConfig(
+    int sample_rate, media::ChannelLayout channel_layout) {
+  base::AutoLock auto_lock(config_lock_);
+  input_sample_rate_ = sample_rate;
+  input_channel_layout_ = channel_layout;
+}
+
+void RendererAudioHardwareConfig::UpdateOutputConfig(int buffer_size,
+                                                     int sample_rate) {
+  base::AutoLock auto_lock(config_lock_);
+  output_buffer_size_ = buffer_size;
+  output_sample_rate_ = sample_rate;
+}
+
+}  // namespace content