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With this cl, sending can be forced with field trial "WebRTC-RFC8888CongestionControlFeedback/force_send:true/" In the future, ReceiveSideCongestionController::EnablSendCongestionControlFeedbackAccordingToRfc8888 if RFC 8888 has been negotiated. Bug: webrtc:42225697 Change-Id: Ib09066aa89ca7b3fffc551da541090c69ab8d75f Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/352720 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42413}
102 lines
4 KiB
C++
102 lines
4 KiB
C++
/*
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* Copyright (c) 2017 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 MODULES_CONGESTION_CONTROLLER_INCLUDE_RECEIVE_SIDE_CONGESTION_CONTROLLER_H_
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#define MODULES_CONGESTION_CONTROLLER_INCLUDE_RECEIVE_SIDE_CONGESTION_CONTROLLER_H_
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#include <memory>
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#include "absl/base/nullability.h"
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#include "api/environment/environment.h"
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#include "api/sequence_checker.h"
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#include "api/transport/network_control.h"
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#include "api/units/data_rate.h"
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#include "api/units/time_delta.h"
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#include "modules/congestion_controller/remb_throttler.h"
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#include "modules/remote_bitrate_estimator/congestion_control_feedback_generator.h"
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#include "modules/remote_bitrate_estimator/transport_sequence_number_feedback_generator.h"
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#include "modules/rtp_rtcp/source/rtp_packet_received.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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namespace webrtc {
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class RemoteBitrateEstimator;
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// This class represents the congestion control state for receive
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// streams. For send side bandwidth estimation, this is simply
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// relaying for each received RTP packet back to the sender. While for
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// receive side bandwidth estimation, we do the estimation locally and
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// send our results back to the sender.
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class ReceiveSideCongestionController : public CallStatsObserver {
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public:
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ReceiveSideCongestionController(
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const Environment& env,
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TransportSequenceNumberFeedbackGenenerator::RtcpSender feedback_sender,
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RembThrottler::RembSender remb_sender,
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absl::Nullable<NetworkStateEstimator*> network_state_estimator);
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~ReceiveSideCongestionController() override = default;
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void EnablSendCongestionControlFeedbackAccordingToRfc8888();
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void OnReceivedPacket(const RtpPacketReceived& packet, MediaType media_type);
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// Implements CallStatsObserver.
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void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) override;
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// This is send bitrate, used to control the rate of feedback messages.
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void OnBitrateChanged(int bitrate_bps);
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// Ensures the remote party is notified of the receive bitrate no larger than
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// `bitrate` using RTCP REMB.
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void SetMaxDesiredReceiveBitrate(DataRate bitrate);
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void SetTransportOverhead(DataSize overhead_per_packet);
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// Returns latest receive side bandwidth estimation.
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// Returns zero if receive side bandwidth estimation is unavailable.
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DataRate LatestReceiveSideEstimate() const;
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// Removes stream from receive side bandwidth estimation.
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// Noop if receive side bwe is not used or stream doesn't participate in it.
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void RemoveStream(uint32_t ssrc);
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// Runs periodic tasks if it is time to run them, returns time until next
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// call to `MaybeProcess` should be non idle.
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TimeDelta MaybeProcess();
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private:
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void PickEstimator(bool has_absolute_send_time)
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RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
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const Environment env_;
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RembThrottler remb_throttler_;
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// TODO: bugs.webrtc.org/42224904 - Use sequence checker for all usage of
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// ReceiveSideCongestionController. At the time of
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// writing OnReceivedPacket and MaybeProcess can unfortunately be called on an
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// arbitrary thread by external projects.
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SequenceChecker sequence_checker_;
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bool send_rfc8888_congestion_feedback_ = false;
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TransportSequenceNumberFeedbackGenenerator
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transport_sequence_number_feedback_generator_;
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CongestionControlFeedbackGenerator congestion_control_feedback_generator_
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RTC_GUARDED_BY(sequence_checker_);
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mutable Mutex mutex_;
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std::unique_ptr<RemoteBitrateEstimator> rbe_ RTC_GUARDED_BY(mutex_);
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bool using_absolute_send_time_ RTC_GUARDED_BY(mutex_);
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uint32_t packets_since_absolute_send_time_ RTC_GUARDED_BY(mutex_);
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};
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} // namespace webrtc
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#endif // MODULES_CONGESTION_CONTROLLER_INCLUDE_RECEIVE_SIDE_CONGESTION_CONTROLLER_H_
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