Refactor VideoTracks to forward all sinks to its source

webrtc/api/videotrackrenderers.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/api/videotrackrenderers.h"
-#include "webrtc/media/engine/webrtcvideoframe.h"
 
-namespace webrtc {
-
-VideoTrackRenderers::VideoTrackRenderers() : enabled_(true) {
-}
-
-VideoTrackRenderers::~VideoTrackRenderers() {
-}
-
-void VideoTrackRenderers::AddOrUpdateSink(
-    VideoSinkInterface<cricket::VideoFrame>* sink,
-    const rtc::VideoSinkWants& wants) {
-  // TODO(nisse): Currently ignores wants. We should somehow use
-  // VideoBroadcaster, but we need to sort out its threading issues
-  // first.
-  rtc::CritScope cs(&critical_section_);
-  if (std::find(sinks_.begin(), sinks_.end(), sink) == sinks_.end())
-    sinks_.push_back(sink);
-}
-
-void VideoTrackRenderers::RemoveSink(
-    VideoSinkInterface<cricket::VideoFrame>* sink) {
-  rtc::CritScope cs(&critical_section_);
-  sinks_.erase(std::remove(sinks_.begin(), sinks_.end(), sink), sinks_.end());
-}
-
-void VideoTrackRenderers::SetEnabled(bool enable) {
-  rtc::CritScope cs(&critical_section_);
-  enabled_ = enable;
-}
-
-bool VideoTrackRenderers::RenderFrame(const cricket::VideoFrame* frame) {
-  {
-    rtc::CritScope cs(&critical_section_);
-    if (enabled_) {
-      RenderFrameToSinks(*frame);
-      return true;
-    }
-  }
-
-  // Generate the black frame outside of the critical section. Note
-  // that this may result in unexpected frame order, in the unlikely
-  // case that RenderFrame is called from multiple threads without
-  // proper serialization, and the track is switched from disabled to
-  // enabled in the middle of the first call.
-  cricket::WebRtcVideoFrame black(new rtc::RefCountedObject<I420Buffer>(
-                                      static_cast<int>(frame->GetWidth()),
-                                      static_cast<int>(frame->GetHeight())),
-                                  frame->GetTimeStamp(),
-                                  frame->GetVideoRotation());
-  black.SetToBlack();
-
-  {
-    rtc::CritScope cs(&critical_section_);
-    // Check enabled_ flag again, since the track might have been
-    // enabled while we generated the black frame. I think the
-    // enabled-ness ought to be applied at the track output, and hence
-    // an enabled track shouldn't send any blacked out frames.
-    RenderFrameToSinks(enabled_ ? *frame : black);
-
-    return true;
-  }
-}
-
-// Called with critical_section_ already locked
-void VideoTrackRenderers::RenderFrameToSinks(const cricket::VideoFrame& frame) {
-  for (auto sink : sinks_) {
-    sink->OnFrame(frame);
-  }
-}
-
-}  // namespace webrtc
+// TODO(perkj): Remove this file once Chrome builds doesnt depend on it.