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.
- */
-
-#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