Associate audio streams with their source/destination RenderView.

content/renderer/media/audio_message_filter.cc

Index: content/renderer/media/audio_message_filter.cc
diff --git a/content/renderer/media/audio_message_filter.cc b/content/renderer/media/audio_message_filter.cc
index d8a6e70c77eac5fa03ad3251e617b6f7b670e02c..3cbb355f7bb666027786f9ebfc1997df30f9a80e 100644
--- a/content/renderer/media/audio_message_filter.cc
+++ b/content/renderer/media/audio_message_filter.cc
@@ -11,6 +11,7 @@
 #include "content/common/media/audio_messages.h"
 #include "content/renderer/render_thread_impl.h"
 #include "ipc/ipc_logging.h"
+#include "media/audio/audio_output_device.h"
 
 namespace content {
 
@@ -42,6 +43,26 @@ void AudioMessageFilter::CreateStream(int stream_id,
   Send(new AudioHostMsg_CreateStream(stream_id, params, input_channels));
 }
 
+void AudioMessageFilter::AssociateStreamWithProducer(int stream_id,
+                                                     int render_view_id) {
+  Send(new AudioHostMsg_AssociateStreamWithProducer(stream_id, render_view_id));
+}
+
+void AudioMessageFilter::AssociateDeviceWithProducer(
+    const scoped_refptr<media::AudioOutputDevice>& device,
+    int render_view_id) {
+  ChildProcess::current()->io_message_loop()->PostTask(

[scherkus (not reviewing), 2012/11/27 22:55:26]

curiously enough, Send() will re-post to the IO thread so I'm not sure how much
faith I have in the comments that these public methods must be called on the IO
thread... can you investigate? 

if not, then I'd prefer to drop the extra method and have callsites call
AssociateStreamWithProduce(device->stream_id(), render_view_id)

[miu, 2012/11/28 07:26:20]

Done.

+      FROM_HERE,
+      base::Bind(&AudioMessageFilter::AssociateDeviceWithProducerOnIOThread,
+                 this, device, render_view_id));
+}
+
+void AudioMessageFilter::AssociateDeviceWithProducerOnIOThread(
+    const scoped_refptr<media::AudioOutputDevice>& device,
+    int render_view_id) {
+  AssociateStreamWithProducer(device->stream_id(), render_view_id);
+}
+
 void AudioMessageFilter::PlayStream(int stream_id) {
   Send(new AudioHostMsg_PlayStream(stream_id));
 }