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/*
* 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.
*/
#ifndef PC_VIDEO_TRACK_H_
#define PC_VIDEO_TRACK_H_
#include <string>
#include "absl/types/optional.h"
#include "api/media_stream_interface.h"
#include "api/media_stream_track.h"
#include "api/scoped_refptr.h"
#include "api/sequence_checker.h"
#include "api/video/video_frame.h"
#include "api/video/video_sink_interface.h"
#include "api/video/video_source_interface.h"
#include "media/base/video_source_base.h"
#include "pc/video_track_source_proxy.h"
#include "rtc_base/system/no_unique_address.h"
#include "rtc_base/thread.h"
#include "rtc_base/thread_annotations.h"
namespace webrtc {
// TODO(tommi): Instead of inheriting from `MediaStreamTrack<>`, implement the
// properties directly in this class. `MediaStreamTrack` doesn't guard against
// conflicting access, so we'd need to override those methods anyway in this
// class in order to make sure things are correctly checked.
class VideoTrack : public MediaStreamTrack<VideoTrackInterface>,
public rtc::VideoSourceBaseGuarded,
public ObserverInterface {
public:
static rtc::scoped_refptr<VideoTrack> Create(
absl::string_view label,
rtc::scoped_refptr<VideoTrackSourceInterface> source,
rtc::Thread* worker_thread);
void AddOrUpdateSink(rtc::VideoSinkInterface<VideoFrame>* sink,
const rtc::VideoSinkWants& wants) override;
void RemoveSink(rtc::VideoSinkInterface<VideoFrame>* sink) override;
void RequestRefreshFrame() override;
VideoTrackSourceInterface* GetSource() const override;
ContentHint content_hint() const override;
void set_content_hint(ContentHint hint) override;
bool set_enabled(bool enable) override;
bool enabled() const override;
MediaStreamTrackInterface::TrackState state() const override;
std::string kind() const override;
// Direct access to the non-proxied source object for internal implementation.
VideoTrackSourceInterface* GetSourceInternal() const;
protected:
VideoTrack(
absl::string_view id,
rtc::scoped_refptr<
VideoTrackSourceProxyWithInternal<VideoTrackSourceInterface>> source,
rtc::Thread* worker_thread);
~VideoTrack();
private:
// Implements ObserverInterface. Observes `video_source_` state.
void OnChanged() override;
RTC_NO_UNIQUE_ADDRESS SequenceChecker signaling_thread_;
rtc::Thread* const worker_thread_;
const rtc::scoped_refptr<
VideoTrackSourceProxyWithInternal<VideoTrackSourceInterface>>
video_source_;
ContentHint content_hint_ RTC_GUARDED_BY(&signaling_thread_);
// Cached `enabled` state for the worker thread. This is kept in sync with
// the state maintained on the signaling thread via set_enabled() but can
// be queried without blocking on the worker thread by callers that don't
// use an api proxy to call the `enabled()` method.
bool enabled_w_ RTC_GUARDED_BY(worker_thread_) = true;
};
} // namespace webrtc
#endif // PC_VIDEO_TRACK_H_
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