MediaStream audio sourcing: Bypass audio processing for non-WebRTC cases.

content/renderer/media/media_stream_center.cc

 // Copyright (c) 2012 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/media_stream_center.h"
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/common/media/media_stream_messages.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/media_stream_audio_sink.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/renderer/media/media_stream.h"
+#include "content/renderer/media/media_stream_audio_track.h"
 #include "content/renderer/media/media_stream_source.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
+#include "content/renderer/media/webaudio_media_stream_source.h"
 #include "content/renderer/media/webrtc/peer_connection_dependency_factory.h"
 #include "content/renderer/media/webrtc_local_audio_source_provider.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamCenterClient.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrackSourcesRequest.h"
 #include "third_party/WebKit/public/platform/WebSourceInfo.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 
 using blink::WebFrame;
 using blink::WebView;
 
 namespace content {
 
 namespace {
 
 void CreateNativeAudioMediaStreamTrack(
     const blink::WebMediaStreamTrack& track,
     PeerConnectionDependencyFactory* factory) {
-  DCHECK(!track.extraData());
+  DCHECK(!MediaStreamAudioTrack::Get(track));
   blink::WebMediaStreamSource source = track.source();
   DCHECK_EQ(source.type(), blink::WebMediaStreamSource::TypeAudio);
-  if (source.remote()) {
-    factory->CreateRemoteAudioTrack(track);
+
+  if (!source.extraData()) {
+    // TODO(miu): This needs to be moved to an appropriate location.  The source
+    // should have been created before this method was called.
+    if (source.requiresAudioConsumer()) {
+      DVLOG(1) << "Creating WebAudio media stream source.";
+      source.setExtraData(new WebAudioMediaStreamSource(source));
+    }
   } else {
-    factory->CreateLocalAudioTrack(track);
+    NOTREACHED()
+        << "WebMediaStreamSource missing its MediaStreamAudioSource.";
+    return;
   }
+
+  static_cast<MediaStreamAudioSource*>(source.extraData())
+      ->ConnectToTrack(track);
 }
 
 void CreateNativeVideoMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
   DCHECK(track.extraData() == NULL);
   blink::WebMediaStreamSource source = track.source();
   DCHECK_EQ(source.type(), blink::WebMediaStreamSource::TypeVideo);
   MediaStreamVideoSource* native_source =
       MediaStreamVideoSource::GetVideoSource(source);
   DCHECK(native_source);
@@ skipping 36 matching lines @@
 MediaStreamCenter::~MediaStreamCenter() {}
 
 void MediaStreamCenter::didCreateMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
   DVLOG(1) << "MediaStreamCenter::didCreateMediaStreamTrack";
   CreateNativeMediaStreamTrack(track, rtc_factory_);
 }
 
 void MediaStreamCenter::didEnableMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
-  MediaStreamTrack* native_track =
-      MediaStreamTrack::GetTrack(track);
-  if (native_track)
+  if (MediaStreamTrack* native_track = MediaStreamTrack::GetTrack(track))
     native_track->SetEnabled(true);
 }
 
 void MediaStreamCenter::didDisableMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
-  MediaStreamTrack* native_track =
-      MediaStreamTrack::GetTrack(track);
-  if (native_track)
+  if (MediaStreamTrack* native_track = MediaStreamTrack::GetTrack(track))
     native_track->SetEnabled(false);
 }
 
 bool MediaStreamCenter::didStopMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
   DVLOG(1) << "MediaStreamCenter::didStopMediaStreamTrack";
-  MediaStreamTrack* native_track = MediaStreamTrack::GetTrack(track);
-  native_track->Stop();
-  return true;
+  if (MediaStreamTrack* native_track = MediaStreamTrack::GetTrack(track)) {
+    native_track->Stop();
+    return true;
+  }
+  return false;
 }
 
 blink::WebAudioSourceProvider*
 MediaStreamCenter::createWebAudioSourceFromMediaStreamTrack(
     const blink::WebMediaStreamTrack& track) {
   DVLOG(1) << "MediaStreamCenter::createWebAudioSourceFromMediaStreamTrack";
-  MediaStreamTrack* media_stream_track =
-      static_cast<MediaStreamTrack*>(track.extraData());
-  if (!media_stream_track) {
+  if (!MediaStreamAudioTrack::Get(track)) {
     DLOG(ERROR) << "Native track missing for webaudio source.";
     return nullptr;
   }
 
   blink::WebMediaStreamSource source = track.source();
   DCHECK_EQ(source.type(), blink::WebMediaStreamSource::TypeAudio);
 
   // TODO(tommi): Rename WebRtcLocalAudioSourceProvider to
   // WebRtcAudioSourceProvider since it's not specific to local.
   return new WebRtcLocalAudioSourceProvider(track);
@@ skipping 38 matching lines @@
 
 bool MediaStreamCenter::didRemoveMediaStreamTrack(
     const blink::WebMediaStream& stream,
     const blink::WebMediaStreamTrack& track) {
   DVLOG(1) << "MediaStreamCenter::didRemoveMediaStreamTrack";
   MediaStream* native_stream = MediaStream::GetMediaStream(stream);
   return native_stream->RemoveTrack(track);
 }
 
 }  // namespace content