blob: 312ec7be1f5edb9b31bc398d5e6b090c2c83c8b1 [file] [log] [blame]
* Copyright (c) 2016 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 <memory>
#include <utility>
#include <vector>
#include "webrtc/api/video/video_frame.h"
#include "webrtc/media/base/videosinkinterface.h"
#include "webrtc/media/base/videosourcebase.h"
#include "webrtc/rtc_base/criticalsection.h"
#include "webrtc/rtc_base/thread_checker.h"
namespace rtc {
// VideoBroadcaster broadcast video frames to sinks and combines
// VideoSinkWants from its sinks. It does that by implementing
// rtc::VideoSourceInterface and rtc::VideoSinkInterface.
// Sinks must be added and removed on one and only one thread.
// Video frames can be broadcasted on any thread. I.e VideoBroadcaster::OnFrame
// can be called on any thread.
class VideoBroadcaster : public VideoSourceBase,
public VideoSinkInterface<webrtc::VideoFrame> {
void AddOrUpdateSink(VideoSinkInterface<webrtc::VideoFrame>* sink,
const VideoSinkWants& wants) override;
void RemoveSink(VideoSinkInterface<webrtc::VideoFrame>* sink) override;
// Returns true if the next frame will be delivered to at least one sink.
bool frame_wanted() const;
// Returns VideoSinkWants a source is requested to fulfill. They are
// aggregated by all VideoSinkWants from all sinks.
VideoSinkWants wants() const;
// This method ensures that if a sink sets rotation_applied == true,
// it will never receive a frame with pending rotation. Our caller
// may pass in frames without precise synchronization with changes
// to the VideoSinkWants.
void OnFrame(const webrtc::VideoFrame& frame) override;
void UpdateWants() EXCLUSIVE_LOCKS_REQUIRED(sinks_and_wants_lock_);
const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& GetBlackFrameBuffer(
int width, int height)
ThreadChecker thread_checker_;
rtc::CriticalSection sinks_and_wants_lock_;
VideoSinkWants current_wants_ GUARDED_BY(sinks_and_wants_lock_);
rtc::scoped_refptr<webrtc::VideoFrameBuffer> black_frame_buffer_;
} // namespace rtc