mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
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78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef ZLMEDIAKIT_NACK_H
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#define ZLMEDIAKIT_NACK_H
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#include "Rtsp/Rtsp.h"
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#include "Rtcp/RtcpFCI.h"
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using namespace mediakit;
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class NackList {
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public:
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NackList() = default;
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~NackList() = default;
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void push_back(RtpPacket::Ptr rtp);
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void for_each_nack(const FCI_NACK &nack, const function<void(const RtpPacket::Ptr &rtp)> &cb);
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private:
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void pop_front();
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uint32_t get_cache_ms();
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RtpPacket::Ptr *get_rtp(uint16_t seq);
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private:
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deque<uint16_t> _nack_cache_seq;
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unordered_map<uint16_t, RtpPacket::Ptr> _nack_cache_pkt;
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};
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class NackContext {
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public:
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using Ptr = std::shared_ptr<NackContext>;
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using onNack = function<void(const FCI_NACK &nack)>;
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//最大保留的rtp丢包状态个数
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static constexpr auto kNackMaxSize = 1024;
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//rtp丢包状态最长保留时间
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static constexpr auto kNackMaxMS = 3 * 1000;
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//nack最多请求重传10次
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static constexpr auto kNackMaxCount = 10;
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//nack重传频率，rtt的倍数
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static constexpr auto kNackIntervalRatio = 2.0f;
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NackContext() = default;
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~NackContext() = default;
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void received(uint16_t seq, bool is_rtx = false);
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void setOnNack(onNack cb);
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uint64_t reSendNack();
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private:
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void eraseFrontSeq();
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void doNack(const FCI_NACK &nack, bool record_nack);
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void recordNack(const FCI_NACK &nack);
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void onRtx(uint16_t seq);
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private:
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int _rtt = 50;
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onNack _cb;
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set<uint16_t> _seq;
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uint16_t _last_max_seq = 0;
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struct NackStatus{
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uint64_t first_stamp;
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uint64_t update_stamp;
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int nack_count = 0;
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};
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map<uint16_t/*seq*/, NackStatus > _nack_send_status;
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};
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#endif //ZLMEDIAKIT_NACK_H
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