Implements MediaStreamVideoSource.

content/renderer/media/media_stream_video_source.cc

 // Copyright 2014 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_video_source.h"
 
-#include "base/logging.h"
-#include "content/public/renderer/media_stream_video_sink.h"
+#include "content/renderer/media/media_stream_dependency_factory.h"
+#include "media/base/video_frame.h"
+#include "third_party/libjingle/source/talk/app/webrtc/remotevideocapturer.h"
+#include "third_party/libjingle/source/talk/media/webrtc/webrtcvideoframe.h"
 
 namespace content {
 
+MediaStreamVideoSource::MediaStreamVideoSource(
+    MediaStreamDependencyFactory* factory)
+    : factory_(factory),
+      width_(0),
+      height_(0),
+      first_frame_timestamp_(media::kNoTimestamp()) {
+  DCHECK(factory_);
+}
+
 void MediaStreamVideoSource::AddTrack(
     const blink::WebMediaStreamTrack& track,
     const blink::WebMediaConstraints& constraints) {
-  // TODO(ronghuawu): Put |track| in the registered tracks list. Will later
-  // deliver frames to it according to |constraints|.
+  factory_->CreateNativeMediaStreamTrack(track);
 }
 
 void MediaStreamVideoSource::RemoveTrack(
     const blink::WebMediaStreamTrack& track) {
-  // TODO(ronghuawu): Remove |track| from the list, i.e. will stop delivering
-  // frame to |track|.
+  // TODO(ronghuawu): What should be done here? Do we really need RemoveTrack?
+}
+
+void MediaStreamVideoSource::Init() {

[no longer working on chromium, 2014/01/15 15:57:22]

how this Init() should be used? can it be called more than once?

[Ronghua Wu (Left Chromium), 2014/01/15 18:38:58]

Added comments in header file.

+  if (!adapter_) {
+    const webrtc::MediaConstraintsInterface* constraints = NULL;
+    adapter_ = factory_->CreateVideoSource(new webrtc::RemoteVideoCapturer(),
+                                           constraints);
+  }
 }
 
 void MediaStreamVideoSource::SetReadyState(
     blink::WebMediaStreamSource::ReadyState state) {
   // TODO(ronghuawu): Sets WebMediaStreamSource's ready state and notifies the
   // ready state to all registered tracks.
 }
 
 void MediaStreamVideoSource::DeliverVideoFrame(
     const scoped_refptr<media::VideoFrame>& frame) {
-  // TODO(ronghuawu): Deliver |frame| to all the registered tracks.
+  if (first_frame_timestamp_ == media::kNoTimestamp()) {
+    first_frame_timestamp_ = frame->GetTimestamp();
+  }
+
+  cricket::VideoRenderer* input = adapter_->FrameInput();
+  if (width_ != frame->coded_size().width() ||
+      height_ != frame->coded_size().height()) {
+    width_ = frame->coded_size().width();
+    height_ = frame->coded_size().height();
+    const int reserved = 0;
+    input->SetSize(width_, height_, reserved);
+  }
+
+  cricket::WebRtcVideoFrame cricket_frame;
+  // TODO(ronghuawu): we assume contiguous layout of image planes and

[no longer working on chromium, 2014/01/15 15:57:22]

Is this a comment or TODO?

[Ronghua Wu (Left Chromium), 2014/01/15 18:38:58]

Moved to header as a note.

+  // FOURCC_I420.
+  const int64 elapsed_time =

[no longer working on chromium, 2014/01/15 15:57:22]

nit, s/elapsed_time/elapsed_time_ns/g
the same for time_stamp

[Ronghua Wu (Left Chromium), 2014/01/15 18:38:58]

Done.

+      (frame->GetTimestamp() - first_frame_timestamp_).InMicroseconds() *
+      base::Time::kNanosecondsPerMicrosecond;
+  const int64 time_stamp = frame->GetTimestamp().InMicroseconds() *
+      base::Time::kNanosecondsPerMicrosecond;
+  const size_t size =
+      media::VideoFrame::AllocationSize(frame->format(), frame->coded_size());
+  const size_t pixel_width = 1;
+  const size_t pixel_height = 1;
+  const int rotation = 0;
+  cricket_frame.Alias(frame->data(0), size,
+                      width_, height_,
+                      pixel_width, pixel_height,
+                      elapsed_time, time_stamp,
+                      rotation);
+  input->RenderFrame(&cricket_frame);
 }
 
 MediaStreamVideoSource::~MediaStreamVideoSource() {
 }
 
 }  // namespace content