2019-08-08 19:01:45 +08:00
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/*
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2019-08-02 18:06:37 +08:00
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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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#include "Stamp.h"
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namespace mediakit {
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void Stamp::revise(uint32_t dts, uint32_t pts, int64_t &dts_out, int64_t &pts_out) {
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2019-08-22 14:56:58 +08:00
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if(!pts){
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//没有播放时间戳,使其赋值为解码时间戳
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pts = dts;
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}
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//pts和dts的差值
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int pts_dts_diff = pts - dts;
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2019-08-02 18:06:37 +08:00
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if(_first){
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//记录第一次时间戳，后面好计算时间戳增量
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_start_dts = dts;
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_first = false;
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2019-08-06 22:54:37 +08:00
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_ticker = std::make_shared<SmoothTicker>();
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}
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2019-08-22 14:56:58 +08:00
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if (!dts) {
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//没有解码时间戳，我们生成解码时间戳
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2019-08-06 22:54:37 +08:00
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dts = _ticker->elapsedTime();
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2019-08-02 18:06:37 +08:00
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}
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//相对时间戳
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dts_out = dts - _start_dts;
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if(dts_out < _dts_inc){
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//本次相对时间戳竟然小于上次？
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if(dts_out < 0 || _dts_inc - dts_out > 0xFFFF){
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//时间戳回环,保证下次相对时间戳与本次相对合理增长
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_start_dts = dts - _dts_inc;
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//本次时间戳强制等于上次时间戳
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dts_out = _dts_inc;
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}else{
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//时间戳变小了？,那么取上次时间戳
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dts_out = _dts_inc;
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}
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}
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//保留这次相对时间戳，以便下次对比是否回环或乱序
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_dts_inc = dts_out;
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//////////////以下是播放时间戳的计算//////////////////
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if(pts_dts_diff > 200 || pts_dts_diff < -200){
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//如果差值大于200毫秒，则认为由于回环导致时间戳错乱了
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pts_dts_diff = 0;
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}
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pts_out = dts_out + pts_dts_diff;
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if(pts_out < 0){
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//时间戳不能小于0
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pts_out = 0;
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}
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}
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}//namespace mediakit
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