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/*
* Copyright (c) 2024 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 MODULES_REMOTE_BITRATE_ESTIMATOR_CONGESTION_CONTROL_FEEDBACK_TRACKER_H_
#define MODULES_REMOTE_BITRATE_ESTIMATOR_CONGESTION_CONTROL_FEEDBACK_TRACKER_H_
#include <cstdint>
#include <optional>
#include <vector>
#include "api/units/timestamp.h"
#include "modules/rtp_rtcp/source/rtcp_packet/congestion_control_feedback.h"
#include "modules/rtp_rtcp/source/rtp_packet_received.h"
#include "rtc_base/network/ecn_marking.h"
#include "rtc_base/numerics/sequence_number_unwrapper.h"
namespace webrtc {
// CongestionControlFeedbackTracker is reponsible for creating and keeping track
// of feedback sent for a specific SSRC when feedback is sent according to
// https://datatracker.ietf.org/doc/rfc8888/
class CongestionControlFeedbackTracker {
public:
CongestionControlFeedbackTracker() = default;
void ReceivedPacket(const RtpPacketReceived& packet);
// Adds received packets to `packet_feedback`
// RTP sequence numbers are continous from the last created feedback unless
// reordering has occured between feedback packets. If so, the sequence
// number range may overlap with previousely sent feedback.
void AddPacketsToFeedback(
Timestamp feedback_time,
std::vector<rtcp::CongestionControlFeedback::PacketInfo>&
packet_feedback);
private:
struct PacketInfo {
uint32_t ssrc;
int64_t unwrapped_sequence_number = 0;
Timestamp arrival_time;
rtc::EcnMarking ecn = rtc::EcnMarking::kNotEct;
};
std::optional<int64_t> last_sequence_number_in_feedback_;
SeqNumUnwrapper<uint16_t> unwrapper_;
std::vector<PacketInfo> packets_;
};
} // namespace webrtc
#endif // MODULES_REMOTE_BITRATE_ESTIMATOR_CONGESTION_CONTROL_FEEDBACK_TRACKER_H_