1e257cacbf
Bug: webrtc:11567 Change-Id: I69e4a1b37737ac8dd852a032612623c4c4f3a30b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176744 Commit-Queue: Markus Handell <handellm@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31648}
70 lines
2.7 KiB
C++
70 lines
2.7 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MEDIA_BASE_VIDEO_BROADCASTER_H_
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#define MEDIA_BASE_VIDEO_BROADCASTER_H_
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#include "api/scoped_refptr.h"
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#include "api/video/video_frame_buffer.h"
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#include "api/video/video_source_interface.h"
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#include "media/base/video_source_base.h"
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#include "rtc_base/synchronization/mutex.h"
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#include "rtc_base/thread_annotations.h"
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#include "rtc_base/thread_checker.h"
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namespace rtc {
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// VideoBroadcaster broadcast video frames to sinks and combines VideoSinkWants
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// from its sinks. It does that by implementing rtc::VideoSourceInterface and
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// rtc::VideoSinkInterface. The class is threadsafe; methods may be called on
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// any thread. This is needed because VideoStreamEncoder calls AddOrUpdateSink
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// both on the worker thread and on the encoder task queue.
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class VideoBroadcaster : public VideoSourceBase,
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public VideoSinkInterface<webrtc::VideoFrame> {
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public:
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VideoBroadcaster();
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~VideoBroadcaster() override;
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void AddOrUpdateSink(VideoSinkInterface<webrtc::VideoFrame>* sink,
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const VideoSinkWants& wants) override;
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void RemoveSink(VideoSinkInterface<webrtc::VideoFrame>* sink) override;
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// Returns true if the next frame will be delivered to at least one sink.
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bool frame_wanted() const;
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// Returns VideoSinkWants a source is requested to fulfill. They are
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// aggregated by all VideoSinkWants from all sinks.
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VideoSinkWants wants() const;
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// This method ensures that if a sink sets rotation_applied == true,
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// it will never receive a frame with pending rotation. Our caller
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// may pass in frames without precise synchronization with changes
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// to the VideoSinkWants.
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void OnFrame(const webrtc::VideoFrame& frame) override;
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void OnDiscardedFrame() override;
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protected:
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void UpdateWants() RTC_EXCLUSIVE_LOCKS_REQUIRED(sinks_and_wants_lock_);
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const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& GetBlackFrameBuffer(
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int width,
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int height) RTC_EXCLUSIVE_LOCKS_REQUIRED(sinks_and_wants_lock_);
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mutable webrtc::Mutex sinks_and_wants_lock_;
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VideoSinkWants current_wants_ RTC_GUARDED_BY(sinks_and_wants_lock_);
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rtc::scoped_refptr<webrtc::VideoFrameBuffer> black_frame_buffer_;
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bool previous_frame_sent_to_all_sinks_ RTC_GUARDED_BY(sinks_and_wants_lock_) =
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true;
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};
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} // namespace rtc
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#endif // MEDIA_BASE_VIDEO_BROADCASTER_H_
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