ZLMediaKit/webrtc/TwccContext.h
2022-09-18 21:03:05 +08:00

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/*
* Copyright (c) 2021 The ZLMediaKit project authors. All Rights Reserved.
*
* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
*
* Use of this source code is governed by MIT license that can be found in the
* LICENSE file in the root of the source tree. All contributing project authors
* may be found in the AUTHORS file in the root of the source tree.
*/
#ifndef ZLMEDIAKIT_TWCCCONTEXT_H
#define ZLMEDIAKIT_TWCCCONTEXT_H
#include <stdint.h>
#include <map>
#include <functional>
#include "Util/TimeTicker.h"
namespace mediakit {
class TwccContext {
public:
using onSendTwccCB = std::function<void(uint32_t ssrc, std::string fci)>;
//每个twcc rtcp包最多表明的rtp ext seq增量
static constexpr size_t kMaxSeqSize = 20;
//每个twcc rtcp包发送的最大时间间隔单位毫秒
static constexpr size_t kMaxTimeDelta = 256;
TwccContext() = default;
~TwccContext() = default;
void onRtp(uint32_t ssrc, uint16_t twcc_ext_seq, uint64_t stamp_ms);
void setOnSendTwccCB(onSendTwccCB cb);
private:
void onSendTwcc(uint32_t ssrc);
bool needSendTwcc() const;
int checkSeqStatus(uint16_t twcc_ext_seq) const;
void clearStatus();
private:
uint64_t _min_stamp = 0;
uint64_t _max_stamp;
std::map<uint32_t /*twcc_ext_seq*/, uint64_t/*recv time in ms*/> _rtp_recv_status;
uint8_t _twcc_pkt_count = 0;
onSendTwccCB _cb;
};
}// namespace mediakit
#endif //ZLMEDIAKIT_TWCCCONTEXT_H