mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-27 13:49:01 +08:00
116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
/*
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* MIT License
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*
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* Copyright (c) 2016-2019 xiongziliang <771730766@qq.com>
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*
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* This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef ZLMEDIAKIT_STAMP_H
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#define ZLMEDIAKIT_STAMP_H
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#include <set>
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#include <cstdint>
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#include "Util/TimeTicker.h"
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using namespace toolkit;
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namespace mediakit {
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class DeltaStamp{
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public:
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DeltaStamp() = default;
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~DeltaStamp() = default;
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/**
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* 计算时间戳增量
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* @param stamp 绝对时间戳
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* @return 时间戳增量
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*/
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int64_t deltaStamp(int64_t stamp);
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/**
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* 设置是否为回放模式，回放模式运行时间戳回退
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* @param playback 是否为回放模式
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*/
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void setPlayBack(bool playback = true);
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private:
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int64_t _last_stamp = 0;
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bool _playback = false;
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};
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//该类解决时间戳回环、回退问题
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//计算相对时间戳或者产生平滑时间戳
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class Stamp : public DeltaStamp{
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public:
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Stamp() = default;
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~Stamp() = default;
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/**
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* 修正时间戳
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* @param dts 输入dts，如果为0则根据系统时间戳生成
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* @param pts 输入pts，如果为0则等于dts
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* @param dts_out 输出dts
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* @param pts_out 输出pts
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* @param modifyStamp 是否用系统时间戳覆盖
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*/
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void revise(int64_t dts, int64_t pts, int64_t &dts_out, int64_t &pts_out,bool modifyStamp = false);
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/**
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* 再设置相对时间戳，用于seek用
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* @param relativeStamp 相对时间戳
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*/
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void setRelativeStamp(int64_t relativeStamp);
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/**
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* 获取当前相对时间戳
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* @return
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*/
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int64_t getRelativeStamp() const ;
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private:
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int64_t _relativeStamp = 0;
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int64_t _last_dts = -1;
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SmoothTicker _ticker;
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};
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class DtsGenerator{
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public:
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DtsGenerator() = default;
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~DtsGenerator() = default;
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bool getDts(uint32_t pts, uint32_t &dts);
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private:
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bool getDts_l(uint32_t pts, uint32_t &dts);
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private:
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uint32_t _dts_pts_offset = 0;
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uint32_t _last_dts = 0;
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uint32_t _last_pts = 0;
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uint32_t _last_max_pts = 0;
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int _frames_since_last_max_pts = 0;
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int _sorter_max_size = 0;
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int _count_sorter_max_size = 0;
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set<uint32_t> _pts_sorter;
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};
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}//namespace mediakit
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#endif //ZLMEDIAKIT_STAMP_H
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