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/*
* Copyright 2019 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_RTP_RECEIVER_H_
#define PC_VIDEO_RTP_RECEIVER_H_
#include <stdint.h>
#include <string>
#include <vector>
#include "absl/types/optional.h"
#include "api/crypto/frame_decryptor_interface.h"
#include "api/dtls_transport_interface.h"
#include "api/frame_transformer_interface.h"
#include "api/media_stream_interface.h"
#include "api/media_types.h"
#include "api/rtp_parameters.h"
#include "api/rtp_receiver_interface.h"
#include "api/scoped_refptr.h"
#include "api/sequence_checker.h"
#include "api/transport/rtp/rtp_source.h"
#include "api/video/video_frame.h"
#include "api/video/video_sink_interface.h"
#include "api/video/video_source_interface.h"
#include "media/base/media_channel.h"
#include "pc/jitter_buffer_delay.h"
#include "pc/media_stream_track_proxy.h"
#include "pc/rtp_receiver.h"
#include "pc/video_rtp_track_source.h"
#include "pc/video_track.h"
#include "rtc_base/ref_counted_object.h"
#include "rtc_base/system/no_unique_address.h"
#include "rtc_base/thread.h"
#include "rtc_base/thread_annotations.h"
namespace webrtc {
class VideoRtpReceiver : public RtpReceiverInternal {
public:
// An SSRC of 0 will create a receiver that will match the first SSRC it
// sees. Must be called on signaling thread.
VideoRtpReceiver(rtc::Thread* worker_thread,
std::string receiver_id,
std::vector<std::string> streams_ids);
// TODO(hbos): Remove this when streams() is removed.
// https://crbug.com/webrtc/9480
VideoRtpReceiver(
rtc::Thread* worker_thread,
const std::string& receiver_id,
const std::vector<rtc::scoped_refptr<MediaStreamInterface>>& streams);
virtual ~VideoRtpReceiver();
rtc::scoped_refptr<VideoTrackInterface> video_track() const { return track_; }
// RtpReceiverInterface implementation
rtc::scoped_refptr<MediaStreamTrackInterface> track() const override {
return track_;
}
rtc::scoped_refptr<DtlsTransportInterface> dtls_transport() const override;
std::vector<std::string> stream_ids() const override;
std::vector<rtc::scoped_refptr<MediaStreamInterface>> streams()
const override;
cricket::MediaType media_type() const override {
return cricket::MEDIA_TYPE_VIDEO;
}
std::string id() const override { return id_; }
RtpParameters GetParameters() const override;
void SetFrameDecryptor(
rtc::scoped_refptr<FrameDecryptorInterface> frame_decryptor) override;
rtc::scoped_refptr<FrameDecryptorInterface> GetFrameDecryptor()
const override;
void SetDepacketizerToDecoderFrameTransformer(
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer) override;
// RtpReceiverInternal implementation.
void Stop() override;
void StopAndEndTrack() override;
void SetupMediaChannel(uint32_t ssrc) override;
void SetupUnsignaledMediaChannel() override;
uint32_t ssrc() const override;
void NotifyFirstPacketReceived() override;
void set_stream_ids(std::vector<std::string> stream_ids) override;
void set_transport(
rtc::scoped_refptr<DtlsTransportInterface> dtls_transport) override;
void SetStreams(const std::vector<rtc::scoped_refptr<MediaStreamInterface>>&
streams) override;
void SetObserver(RtpReceiverObserverInterface* observer) override;
void SetJitterBufferMinimumDelay(
absl::optional<double> delay_seconds) override;
void SetMediaChannel(cricket::MediaChannel* media_channel) override;
int AttachmentId() const override { return attachment_id_; }
std::vector<RtpSource> GetSources() const override;
private:
void RestartMediaChannel(absl::optional<uint32_t> ssrc);
void SetSink(rtc::VideoSinkInterface<VideoFrame>* sink)
RTC_RUN_ON(worker_thread_);
void SetMediaChannel_w(cricket::MediaChannel* media_channel)
RTC_RUN_ON(worker_thread_);
// VideoRtpTrackSource::Callback
void OnGenerateKeyFrame();
void OnEncodedSinkEnabled(bool enable);
void SetEncodedSinkEnabled(bool enable) RTC_RUN_ON(worker_thread_);
class SourceCallback : public VideoRtpTrackSource::Callback {
public:
explicit SourceCallback(VideoRtpReceiver* receiver) : receiver_(receiver) {}
~SourceCallback() override = default;
private:
void OnGenerateKeyFrame() override { receiver_->OnGenerateKeyFrame(); }
void OnEncodedSinkEnabled(bool enable) override {
receiver_->OnEncodedSinkEnabled(enable);
}
VideoRtpReceiver* const receiver_;
} source_callback_{this};
RTC_NO_UNIQUE_ADDRESS SequenceChecker signaling_thread_checker_;
rtc::Thread* const worker_thread_;
const std::string id_;
// See documentation for `stopped_` below for when a valid media channel
// has been assigned and when this pointer will be null.
cricket::VideoMediaChannel* media_channel_ RTC_GUARDED_BY(worker_thread_) =
nullptr;
absl::optional<uint32_t> ssrc_ RTC_GUARDED_BY(worker_thread_);
// |source_| is held here to be able to change the state of the source when
// the VideoRtpReceiver is stopped.
const rtc::scoped_refptr<VideoRtpTrackSource> source_;
const rtc::scoped_refptr<VideoTrackProxyWithInternal<VideoTrack>> track_;
std::vector<rtc::scoped_refptr<MediaStreamInterface>> streams_
RTC_GUARDED_BY(&signaling_thread_checker_);
// `stopped` is state that's used on the signaling thread to indicate whether
// a valid `media_channel_` has been assigned and configured. When an instance
// of VideoRtpReceiver is initially created, `stopped_` is true and will
// remain true until either `SetupMediaChannel` or
// `SetupUnsignaledMediaChannel` is called after assigning a media channel.
// After that, `stopped_` will remain false until `Stop()` is called.
// Note, for checking the state of the class on the worker thread,
// check `media_channel_` instead, as that's the main worker thread state.
bool stopped_ RTC_GUARDED_BY(&signaling_thread_checker_) = true;
RtpReceiverObserverInterface* observer_
RTC_GUARDED_BY(&signaling_thread_checker_) = nullptr;
bool received_first_packet_ RTC_GUARDED_BY(&signaling_thread_checker_) =
false;
const int attachment_id_;
rtc::scoped_refptr<FrameDecryptorInterface> frame_decryptor_
RTC_GUARDED_BY(worker_thread_);
rtc::scoped_refptr<DtlsTransportInterface> dtls_transport_
RTC_GUARDED_BY(&signaling_thread_checker_);
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer_
RTC_GUARDED_BY(worker_thread_);
// Stores the minimum jitter buffer delay. Handles caching cases
// if |SetJitterBufferMinimumDelay| is called before start.
JitterBufferDelay delay_ RTC_GUARDED_BY(worker_thread_);
// Records if we should generate a keyframe when |media_channel_| gets set up
// or switched.
bool saved_generate_keyframe_ RTC_GUARDED_BY(worker_thread_) = false;
bool saved_encoded_sink_enabled_ RTC_GUARDED_BY(worker_thread_) = false;
};
} // namespace webrtc
#endif // PC_VIDEO_RTP_RECEIVER_H_
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