Revert of Make cricket::VideoCapturer implement VideoSourceInterface

webrtc/media/base/capturerenderadapter.cc

 /*
  *  Copyright (c) 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.
  */
 
-// TODO(perkj): Remove this dummy file once Chrome is not depending on it.
+#include "webrtc/media/base/capturerenderadapter.h"
+
+#include "webrtc/base/logging.h"
+#include "webrtc/media/base/videocapturer.h"
+#include "webrtc/media/base/videorenderer.h"
+
+namespace cricket {
+
+CaptureRenderAdapter::CaptureRenderAdapter(VideoCapturer* video_capturer)
+    : video_capturer_(video_capturer) {
+}
+
+CaptureRenderAdapter::~CaptureRenderAdapter() {
+  // Since the signal we're connecting to is multi-threaded,
+  // disconnect_all() will block until all calls are serviced, meaning any
+  // outstanding calls to OnVideoFrame will be done when this is done, and no
+  // more calls will be serviced by this.
+  // We do this explicitly instead of just letting the has_slots<> destructor
+  // take care of it because we need to do this *before* sinks_ is
+  // cleared by the destructor; otherwise we could mess with it while
+  // OnVideoFrame is running.
+  // We *don't* take capture_crit_ here since it could deadlock with the lock
+  // taken by the video frame signal.
+  disconnect_all();
+}
+
+CaptureRenderAdapter* CaptureRenderAdapter::Create(
+    VideoCapturer* video_capturer) {
+  if (!video_capturer) {
+    return NULL;
+  }
+  CaptureRenderAdapter* return_value = new CaptureRenderAdapter(video_capturer);
+  return_value->Init();  // Can't fail.
+  return return_value;
+}
+
+void CaptureRenderAdapter::AddSink(rtc::VideoSinkInterface<VideoFrame>* sink) {
+  RTC_DCHECK(sink);
+
+  rtc::CritScope cs(&capture_crit_);
+  // This implements set semantics, the same renderer can only be
+  // added once.
+  // TODO(nisse): Is this really needed?
+  if (std::find(sinks_.begin(), sinks_.end(), sink) == sinks_.end())
+    sinks_.push_back(sink);
+}
+
+void CaptureRenderAdapter::RemoveSink(
+    rtc::VideoSinkInterface<VideoFrame>* sink) {
+  RTC_DCHECK(sink);
+
+  rtc::CritScope cs(&capture_crit_);
+  sinks_.erase(std::remove(sinks_.begin(), sinks_.end(), sink), sinks_.end());
+}
+
+void CaptureRenderAdapter::Init() {
+  video_capturer_->SignalVideoFrame.connect(
+      this,
+      &CaptureRenderAdapter::OnVideoFrame);
+}
+
+void CaptureRenderAdapter::OnVideoFrame(VideoCapturer* capturer,
+                                        const VideoFrame* video_frame) {
+  rtc::CritScope cs(&capture_crit_);
+  if (sinks_.empty()) {
+    return;
+  }
+
+  for (auto* sink : sinks_)
+    sink->OnFrame(*video_frame);
+}
+
+}  // namespace cricket