Introduce AudioHardwareConfig for renderer side audio device info.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index d9baea00cb95471840b09fce25f6193420800a58..428c893ae557121c15bcdac9320883255f5683a3 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -55,7 +55,6 @@
 #include "content/renderer/gpu/compositor_thread.h"
 #include "content/renderer/gpu/compositor_output_surface.h"
 #include "content/renderer/gpu/gpu_benchmarking_extension.h"
-#include "content/renderer/media/audio_hardware.h"
 #include "content/renderer/media/audio_input_message_filter.h"
 #include "content/renderer/media/audio_message_filter.h"
 #include "content/renderer/media/audio_renderer_mixer_manager.h"
@@ -73,6 +72,7 @@
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_forwarding_message_filter.h"
 #include "ipc/ipc_platform_file.h"
+#include "media/base/audio_hardware_config.h"
 #include "media/base/media.h"
 #include "media/base/media_switches.h"
 #include "net/base/net_errors.h"
@@ -897,13 +897,32 @@ RenderThreadImpl::GetGpuVDAContext3D() {
 AudioRendererMixerManager* RenderThreadImpl::GetAudioRendererMixerManager() {
   if (!audio_renderer_mixer_manager_.get()) {
     audio_renderer_mixer_manager_.reset(new AudioRendererMixerManager(
-        GetAudioOutputSampleRate(),
-        GetAudioOutputBufferSize()));
+        GetAudioHardwareConfig()));
   }
 
   return audio_renderer_mixer_manager_.get();
 }
 
+media::AudioHardwareConfig* RenderThreadImpl::GetAudioHardwareConfig() {
+  if (!audio_hardware_config_) {
+    int output_buffer_size;
+    int output_sample_rate;
+    int input_sample_rate;
+    media::ChannelLayout input_channel_layout;
+
+    Send(new ViewHostMsg_GetAudioHardwareConfig(
+        &output_buffer_size, &output_sample_rate,
+        &input_sample_rate, &input_channel_layout));
+
+    audio_hardware_config_.reset(new media::AudioHardwareConfig(
+        output_buffer_size, output_sample_rate, input_sample_rate,
+        input_channel_layout));
+    audio_message_filter_->SetAudioHardwareConfig(audio_hardware_config_.get());

[henrika (OOO until Aug 14), 2013/01/30 10:28:13]

Nice!

+  }
+
+  return audio_hardware_config_.get();
+}
+
 #if defined(OS_WIN)
 void RenderThreadImpl::PreCacheFontCharacters(const LOGFONT& log_font,
                                               const string16& str) {