mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
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120 lines
3.1 KiB
C++
120 lines
3.1 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/xia-chu/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_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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private:
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int64_t _last_stamp = 0;
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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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* 求取相对时间戳,同时实现了音视频同步、限制dts回退等功能
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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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/**
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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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/**
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* 音视频同步用，音频应该同步于视频(只修改音频时间戳)
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* 因为音频时间戳修改后不影响播放速度
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*/
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void syncTo(Stamp &other);
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private:
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//主要实现音视频时间戳同步功能
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void revise_l(int64_t dts, int64_t pts, int64_t &dts_out, int64_t &pts_out,bool modifyStamp = false);
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//主要实现获取相对时间戳功能
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void revise_l2(int64_t dts, int64_t pts, int64_t &dts_out, int64_t &pts_out,bool modifyStamp = false);
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private:
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int64_t _relative_stamp = 0;
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int64_t _last_dts_in = 0;
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int64_t _last_dts_out = 0;
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int64_t _last_pts_out = 0;
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SmoothTicker _ticker;
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bool _playback = false;
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Stamp *_sync_master = nullptr;
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};
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//dts生成器，
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//pts排序后就是dts
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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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size_t _frames_since_last_max_pts = 0;
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size_t _sorter_max_size = 0;
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size_t _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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