Adds proper IPC usage for AudioDevice::GetAudioHardwareBufferSize().

This method did previously call directly into media/audio.

BUG=none
TEST=WebAudio demo in multi-process mode
Review URL: http://codereview.chromium.org/8497014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@109388 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 17 insertions, 5 deletions

diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index 624af29..8f58ec8 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -356,6 +356,8 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message,
                         OnCacheableMetadataAvailable)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_Keygen, OnKeygen)
     IPC_MESSAGE_HANDLER(ViewHostMsg_AsyncOpenFile, OnAsyncOpenFile)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_GetHardwareBufferSize,
+                        OnGetHardwareBufferSize)
     IPC_MESSAGE_HANDLER(ViewHostMsg_GetHardwareInputSampleRate,
                         OnGetHardwareInputSampleRate)
     IPC_MESSAGE_HANDLER(ViewHostMsg_GetHardwareSampleRate,
@@ -606,6 +608,10 @@ void RenderMessageFilter::OnGenerateRoutingID(int* route_id) {
   *route_id = render_widget_helper_->GetNextRoutingID();
 }
 
+void RenderMessageFilter::OnGetHardwareBufferSize(uint32* buffer_size) {
+  *buffer_size = static_cast<uint32>(media::GetAudioHardwareBufferSize());
+}
+
 void RenderMessageFilter::OnGetHardwareInputSampleRate(double* sample_rate) {
   *sample_rate = media::GetAudioInputHardwareSampleRate();
 }
diff --git a/content/browser/renderer_host/render_message_filter.h b/content/browser/renderer_host/render_message_filter.h
index a38aa9e..1215554 100644
--- a/content/browser/renderer_host/render_message_filter.h
+++ b/content/browser/renderer_host/render_message_filter.h
@@ -178,6 +178,7 @@ class RenderMessageFilter : public BrowserMessageFilter {
   void OnCheckNotificationPermission(const GURL& source_origin,
                                      int* permission_level);
 
+  void OnGetHardwareBufferSize(uint32* buffer_size);
   void OnGetHardwareInputSampleRate(double* sample_rate);
   void OnGetHardwareSampleRate(double* sample_rate);
 
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index ce9ea3e..a5315e6 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -682,6 +682,10 @@ IPC_MESSAGE_ROUTED1(ViewMsg_SetCSSColors,
 IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GenerateRoutingID,
                             int /* routing_id */)
 
+// Asks the browser for the default audio hardware buffer-size.
+IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetHardwareBufferSize,
+                            uint32 /* buffer_size */)
+
 // Asks the browser for the default audio input hardware sample-rate.
 IPC_SYNC_MESSAGE_CONTROL0_1(ViewHostMsg_GetHardwareInputSampleRate,
                             double /* sample_rate */)
diff --git a/content/renderer/media/audio_device.cc b/content/renderer/media/audio_device.cc
index 7f007da..22edb16 100644
--- a/content/renderer/media/audio_device.cc
+++ b/content/renderer/media/audio_device.cc
@@ -213,7 +213,6 @@ void AudioDevice::Run() {
   while ((sizeof(pending_data) == socket_->Receive(&pending_data,
                                                    sizeof(pending_data))) &&
          (pending_data >= 0)) {
-
     // Convert the number of pending bytes in the render buffer
     // into milliseconds.
     audio_delay_milliseconds_ = pending_data / bytes_per_ms;
@@ -247,10 +246,12 @@ double AudioDevice::GetAudioHardwareSampleRate() {
 
 size_t AudioDevice::GetAudioHardwareBufferSize() {
   // Uses cached value if possible.
-  static size_t buffer_size = 0;
+  static uint32 buffer_size = 0;
 
-  if (!buffer_size)
-    buffer_size = media::GetAudioHardwareBufferSize();
+  if (!buffer_size) {
+    RenderThreadImpl::current()->Send(
+        new ViewHostMsg_GetHardwareBufferSize(&buffer_size));
+  }
 
-  return buffer_size;
+  return static_cast<size_t>(buffer_size);
 }