Implements MediaStreamVideoSource.

content/renderer/media/media_stream_dependency_factory.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_dependency_factory.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 596 matching lines @@
     case blink::WebMediaStreamSource::TypeAudio:
       return native_stream->RemoveTrack(
           native_stream->FindAudioTrack(track_id));
     case blink::WebMediaStreamSource::TypeVideo:
       return native_stream->RemoveTrack(
           native_stream->FindVideoTrack(track_id));
   }
   return false;
 }
 
+blink::WebMediaStreamTrack
+    MediaStreamDependencyFactory::CreateMediaStreamVideoTrack(

[perkj_chrome, 2014/01/10 13:07:00]

I am not sure this belong here. The dependency factory was created originally to
wrap instansiating the webrtc classes. 

[Ronghua Wu (Left Chromium), 2014/01/11 01:22:58]

Not sure where else should I put this though. The comment for the dependency
factory does say "Object factory for RTC MediaStreams and RTC PeerConnections.".

+        const std::string& id) {
+  blink::WebMediaStreamTrack track;
+  blink::WebMediaStreamSource source;
+  blink::WebString idw(base::UTF8ToUTF16(id));
+  source.initialize(idw, blink::WebMediaStreamSource::TypeVideo, idw);
+  track.initialize(idw, source);
+  return track;
+}
+
+scoped_refptr<webrtc::VideoSourceInterface>
+    MediaStreamDependencyFactory::CreateVideoSource(

[perkj_chrome, 2014/01/10 13:07:00]

Make sure this method is used everywhere in this class to remove code
duplication.

[Ronghua Wu (Left Chromium), 2014/01/11 01:22:58]

Done.

+        cricket::VideoCapturer* capturer,
+        const blink::WebMediaConstraints& constraints) {
+  RTCMediaConstraints native_constraints(constraints);
+  // The video source takes ownership of |capturer|.
+  scoped_refptr<webrtc::VideoSourceInterface> source =
+      pc_factory_->CreateVideoSource(capturer, &native_constraints).get();
+  return source;
+}
+
 bool MediaStreamDependencyFactory::CreatePeerConnectionFactory() {
   DCHECK(!pc_factory_.get());
   DCHECK(!audio_device_.get());
   DVLOG(1) << "MediaStreamDependencyFactory::CreatePeerConnectionFactory()";
 
   scoped_ptr<cricket::WebRtcVideoDecoderFactory> decoder_factory;
   scoped_ptr<cricket::WebRtcVideoEncoderFactory> encoder_factory;
 
   const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
   scoped_refptr<RendererGpuVideoAcceleratorFactories> gpu_factories =
@@ skipping 416 matching lines @@
   if (!aec_dump_file_stream) {
     VLOG(1) << "Could not open AEC dump file.";
     base::ClosePlatformFile(aec_dump_file);
   } else {
     // |pc_factory_| takes ownership of |aec_dump_file_stream|.
     pc_factory_->StartAecDump(aec_dump_file_stream);
   }
 }
 
 }  // namespace content