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/*
synchronisation of audio/video (PTS) against system clock stamps (SCR)
Copyright (C) 2000 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "syncClockMPEG.h"
#include <iostream>
using namespace std;
SyncClockMPEG::SyncClockMPEG() {
syncMode=__SYNC_NONE;
abs_thread_mutex_init(&scrMut);
abs_thread_mutex_init(&changeMut);
lastSCR=0.0;
lastPTS=0.0;
jitter=0.0;
oldjitter=0.0;
TimeWrapper::gettimeofday(&lastPTS_time);
}
SyncClockMPEG::~SyncClockMPEG() {
abs_thread_mutex_destroy(&changeMut);
abs_thread_mutex_destroy(&scrMut);
}
int SyncClockMPEG::getSyncMode() {
return syncMode;
}
void SyncClockMPEG::setSyncMode(int syncMode) {
this->syncMode=syncMode;
}
int SyncClockMPEG::syncAudio(double pts,double scr) {
switch(syncMode) {
case __SYNC_AUDIO:
markLastPTSTime(scr,pts);
break;
default:
cout << "syncMode not implemented:"<<syncMode<<endl;
}
return true;
}
int SyncClockMPEG::syncVideo(double pts,double scr,
TimeStamp* earlyTime,
TimeStamp* waitTime) {
int back;
switch(syncMode) {
case __SYNC_AUDIO:
back=gowait(scr,pts,earlyTime,waitTime);
return back;
break;
case __SYNC_NONE:
return true;
default:
cout << "syncMode not implemented"<<endl;
}
return true;
}
void SyncClockMPEG::lockSyncClock() {
abs_thread_mutex_lock(&changeMut);
abs_thread_mutex_lock(&scrMut);
abs_thread_mutex_unlock(&changeMut);
}
void SyncClockMPEG::unlockSyncClock() {
abs_thread_mutex_unlock(&scrMut);
}
double SyncClockMPEG::getPTSTime(double* window) {
lockSyncClock();
double currentPTS;
timeval_t current_time;
timeval_t passed_time;
TimeWrapper::gettimeofday(¤t_time);
a_Minus_b_Is_C(¤t_time,&lastPTS_time,&passed_time);
currentPTS=lastPTS+timeval2Double(&passed_time);
*window=jitter+oldjitter;
unlockSyncClock();
return currentPTS;
}
void SyncClockMPEG::markLastPTSTime(double ,double pts) {
double tmp;
double expect_time=getPTSTime(&tmp);
lockSyncClock();
oldjitter=jitter;
jitter=expect_time-pts;
TimeWrapper::gettimeofday(&lastPTS_time);
lastPTS=pts;
unlockSyncClock();
/*
cout << "(audio) pts stream:"<<pts
<< " expect:"<<expect_time<<" jitter:"<<jitter<<endl;
*/
}
int SyncClockMPEG::a_Minus_b_Is_C(timeval_t* a,timeval_t* b,timeval_t* c){
c->tv_usec=a->tv_usec;
c->tv_sec=a->tv_sec;
c->tv_usec-=b->tv_usec;
c->tv_sec-=b->tv_sec;
if (c->tv_usec <= 0) {
c->tv_usec=c->tv_usec+1000000;
c->tv_sec--;
}
if (c->tv_usec >= 1000000) {
c->tv_usec=c->tv_usec-1000000;
c->tv_sec++;
}
return true;
}
double SyncClockMPEG::timeval2Double(timeval_t* a) {
return (double)a->tv_sec+(double)(a->tv_usec)/1000000.0;
}
void SyncClockMPEG::double2Timeval(double a,timeval_t* dest) {
dest->tv_sec=(int)a;
dest->tv_usec=(int)(1000000.0*(double)(a-(double)dest->tv_sec));
}
int SyncClockMPEG::gowait(double ,double pts,
TimeStamp* earlyTime,TimeStamp* ) {
double window;
double currentPTS=getPTSTime(&window);
double diff_time;
// in window we have the jitter
// diff_time is positive when we are in the future
diff_time=pts-(currentPTS+window);
// tolerate one frame (for 25 frames/s) in the future
// but wait a bit
if (diff_time > 0.0) {
diff_time=diff_time/4.0;
double2Timeval(diff_time,earlyTime->getTime());
if (diff_time > 1) {
// cannot be, we assume stange clock error
earlyTime->set(1,0);
}
return true;
}
earlyTime->set(0,0);
// one frame late, display it, without waiting
// and hope we catch up
if (diff_time > -0.04) {
return true;
}
/*
cout << "(video) pts stream:"<<pts
<< " pts expect:"<<currentPTS
<< " window:"<<window<<endl;
*/
return false;
}
void SyncClockMPEG::printTime(timeval_t* a,char* text) {
cout << text
<< "time(sec):"<<a->tv_sec
<< "time(usec)"<<a->tv_usec<<endl;
}
void SyncClockMPEG::print(char* text) {
cout << text
<< " lastPTS:"<<lastPTS
<< " lastSCR:"<<lastSCR
<< " jitter:"<<jitter;
printTime(&lastPTS_time,(char*)"lastPTS_time");
printTime(&lastSCR_time,(char*)"lastSCR_time");
}
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