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78 lines
1.8 KiB
78 lines
1.8 KiB
15 years ago
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/*
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synchronisation of audio/video (PTS) against system clock stamps (SCR)
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Copyright (C) 2000 Martin Vogt
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation.
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For more information look at the file COPYRIGHT in this package
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*/
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#ifndef __SYNCCLOCKMPEG_H
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#define __SYNCCLOCKMPEG_H
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#include "syncClock.h"
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/**
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The idea is similar to this:
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We start a clock and selext a synchronisation mode.
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(AUDIO,VIDEO,BOTH,NONE)
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Assume we select AUDIO. When the audio thread delivers an SCR
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and an PTS, we set the SCR from this set, as the new
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time reference fo rthis clock.
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If a video thread enters the class, with an SCR,PTS we wait,
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or directly return if the PTS is in time or out of time,
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but we never set the SCR.
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*/
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class SyncClockMPEG : public SyncClock {
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int syncMode;
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double lastSCR;
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double lastPTS;
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double jitter;
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double oldjitter;
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timeval_t lastSCR_time;
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timeval_t lastPTS_time;
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timeval_t drift_time;
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public:
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SyncClockMPEG();
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~SyncClockMPEG();
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int getSyncMode();
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void setSyncMode(int syncMode);
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int syncAudio(double pts,double scr);
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int syncVideo(double pts,double scr,
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class TimeStamp* earlyTime,class TimeStamp* waitTime);
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void print(char* text);
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double getPTSTime(double* window);
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private:
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void printTime(timeval_t* a,char* text);
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void markLastPTSTime(double scr,double pts);
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int gowait(double scr,double pts,
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class TimeStamp* earlyTime,class TimeStamp* waitTime);
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int a_Minus_b_Is_C(timeval_t* a,timeval_t* b,timeval_t* c);
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double timeval2Double(timeval_t* a);
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void double2Timeval(double a,timeval_t* dest);
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void lockSyncClock();
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void unlockSyncClock();
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abs_thread_mutex_t scrMut;
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abs_thread_mutex_t changeMut;
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};
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#endif
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