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89 lines
3.2 KiB
C++
89 lines
3.2 KiB
C++
/*
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* Copyright (c) 2024 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_REMOTE_BITRATE_ESTIMATOR_CONGESTION_CONTROL_FEEDBACK_GENERATOR_H_
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#define MODULES_REMOTE_BITRATE_ESTIMATOR_CONGESTION_CONTROL_FEEDBACK_GENERATOR_H_
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#include <cstdint>
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#include <map>
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#include <memory>
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#include <optional>
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#include "api/clock/clock.h"
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#include "api/units/data_rate.h"
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#include "api/units/data_size.h"
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#include "api/units/time_delta.h"
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#include "api/units/timestamp.h"
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#include "congestion_control_feedback_tracker.h"
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#include "rtp_packet_received.h"
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#include "rtp_transport_feedback_generator.h"
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namespace webrtc {
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// The class is responsible for generating RTCP feedback packets based on
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// incoming media packets. Feedback format will comply with RFC 8888.
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// https://datatracker.ietf.org/doc/rfc8888/
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// Feedback should not use more than 5% of the configured send bandwidth
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// estimate. Min and max duration between feedback is configurable using field
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// trials, but per default, min is 25ms and max is 250ms.
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// If possible, given the other constraints, feedback will be sent when a packet
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// with marker bit is received in order to provide feedback as soon as possible
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// after receiving a complete video frame. If no packet with marker bit is
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// received, feedback can be delayed up to 25ms after the first packet since the
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// last sent feedback. On good networks, this means that a sender may receive
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// feedback for every sent frame.
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class CongestionControlFeedbackGenerator
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: public RtpTransportFeedbackGenerator {
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public:
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CongestionControlFeedbackGenerator(
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std::shared_ptr<Clock> clock,
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RtpTransportFeedbackGenerator::RtcpSender feedback_sender);
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~CongestionControlFeedbackGenerator() = default;
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void OnReceivedPacket(const RtpPacketReceived& packet) override;
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void OnSendBandwidthEstimateChanged(DataRate estimate) override;
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TimeDelta Process(Timestamp now) override;
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void SetTransportOverhead(DataSize overhead_per_packet) override;
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private:
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Timestamp NextFeedbackTime() const;
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void SendFeedback(Timestamp now);
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void CalculateNextPossibleSendTime(DataSize feedback_size, Timestamp now);
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std::shared_ptr<Clock> clock_;
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const RtcpSender rtcp_sender_;
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TimeDelta min_time_between_feedback_;
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TimeDelta max_time_to_wait_for_packet_with_marker_;
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TimeDelta max_time_between_feedback_;
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DataRate max_feedback_rate_ = DataRate::KilobitsPerSec(1000);
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DataSize packet_overhead_ = DataSize::Zero();
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DataSize send_rate_debt_ = DataSize::Zero();
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std::map</*ssrc=*/uint32_t, CongestionControlFeedbackTracker>
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feedback_trackers_;
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// std::vector<PacketInfo> packets_;
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Timestamp last_feedback_sent_time_ = Timestamp::Zero();
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std::optional<Timestamp> first_arrival_time_since_feedback_;
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bool marker_bit_seen_ = false;
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Timestamp next_possible_feedback_send_time_ = Timestamp::Zero();
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};
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} // namespace webrtc
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#endif // MODULES_REMOTE_BITRATE_ESTIMATOR_CONGESTION_CONTROL_FEEDBACK_GENERATOR_H_
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