mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-25 12:11:36 +08:00
89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
/*
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* Copyright (c) 2016-present 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-like 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 <set>
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#include <map>
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#include <deque>
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#include <unordered_map>
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#include "Rtsp/Rtsp.h"
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#include "Rtcp/RtcpFCI.h"
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namespace mediakit {
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class NackList {
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public:
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void pushBack(RtpPacket::Ptr rtp);
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void forEach(const FCI_NACK &nack, const std::function<void(const RtpPacket::Ptr &rtp)> &cb);
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private:
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void popFront();
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uint32_t getCacheMS();
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int64_t getRtpStamp(uint16_t seq);
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RtpPacket::Ptr *getRtp(uint16_t seq);
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private:
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uint32_t _cache_ms_check = 0;
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std::deque<uint16_t> _nack_cache_seq;
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std::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 = std::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 = 2048;
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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 = 15;
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// nack重传频率，rtt的倍数
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static constexpr auto kNackIntervalRatio = 1.0f;
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// nack包中rtp个数，减小此值可以让nack包响应更灵敏
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static constexpr auto kNackRtpSize = 8;
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static_assert(kNackRtpSize >=0 && kNackRtpSize <= FCI_NACK::kBitSize, "NackContext::kNackRtpSize must between 0 and 16");
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NackContext();
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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 clearNackStatus(uint16_t seq);
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void makeNack(uint16_t max, bool flush = false);
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private:
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bool _started = false;
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int _rtt = 50;
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onNack _cb;
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std::set<uint16_t> _seq;
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// 最新nack包中的rtp seq值
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uint16_t _nack_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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std::map<uint16_t /*seq*/, NackStatus> _nack_send_status;
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};
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} // namespace mediakit
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#endif //ZLMEDIAKIT_NACK_H
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