Adding audio support to the new webmediaplyer

content/renderer/media/media_stream_impl.cc

Index: content/renderer/media/media_stream_impl.cc
diff --git a/content/renderer/media/media_stream_impl.cc b/content/renderer/media/media_stream_impl.cc
index 95ad1a5d486784ee05c322a92a11afd47f4a4837..f55172ed8dc8810dc7e9ae185c0976e34552bb3e 100644
--- a/content/renderer/media/media_stream_impl.cc
+++ b/content/renderer/media/media_stream_impl.cc
@@ -20,7 +20,9 @@
 #include "content/renderer/media/rtc_video_renderer.h"
 #include "content/renderer/media/video_capture_impl_manager.h"
 #include "content/renderer/media/webrtc_uma_histograms.h"
+#include "content/renderer/media/webrtc_audio_renderer.h"
 #include "media/base/message_loop_factory.h"
+#include "media/base/rtc_audio_renderer.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebMediaConstraints.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
@@ -262,6 +264,40 @@ scoped_refptr<media::VideoDecoder> MediaStreamImpl::GetVideoDecoder(
   return NULL;
 }
 
+scoped_refptr<media::RtcAudioRenderer> MediaStreamImpl::GetAudioRenderer(
+    const GURL& url) {
+  DCHECK(CalledOnValidThread());
+  WebKit::WebMediaStreamDescriptor descriptor(GetMediaStream(url));
+
+  if (descriptor.isNull() || !descriptor.extraData())
+    return NULL;  // This is not a valid stream.
+
+  DVLOG(1) << "MediaStreamImpl::GetAudioRenderer stream:"
+           << UTF16ToUTF8(descriptor.label());
+
+  MediaStreamExtraData* extra_data =
+      static_cast<MediaStreamExtraData*>(descriptor.extraData());
+  if (extra_data->remote_stream()) {
+    scoped_refptr<WebRtcAudioRenderer> renderer =
+        CreateRemoteAudioRenderer(extra_data->remote_stream());
+
+    if (dependency_factory_->GetWebRtcAudioDevice()->SetRenderer(renderer)) {
+      return renderer;
+    } else {
+      // WebRtcAudioDeviceImpl can only support one renderer.
+      return NULL;
+    }
+  }
+
+  if (extra_data->local_stream()) {
+    // TODO(xians): Implement a WebRtcAudioFIFO to handle the local loopback.
+    return NULL;
+  }
+
+  NOTREACHED();
+  return NULL;
+}
+
 // Callback from MediaStreamDispatcher.
 // The requested stream have been generated.
 void MediaStreamImpl::OnStreamGenerated(
@@ -472,6 +508,17 @@ scoped_refptr<media::VideoDecoder> MediaStreamImpl::CreateRemoteVideoDecoder(
       stream->video_tracks()->at(0));
 }
 
+scoped_refptr<WebRtcAudioRenderer> MediaStreamImpl::CreateRemoteAudioRenderer(
+    webrtc::MediaStreamInterface* stream) {
+  if (!stream->audio_tracks() || stream->audio_tracks()->count() == 0)
+    return NULL;
+
+  DVLOG(1) << "MediaStreamImpl::CreateRemoteAudioRenderer label:"
+           << stream->label();
+
+  return new WebRtcAudioRenderer();
+}
+
 MediaStreamExtraData::MediaStreamExtraData(
     webrtc::MediaStreamInterface* remote_stream)
     : remote_stream_(remote_stream) {