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/*
parse/stores GOP (group of picture) information from a mpegVideoStream
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 "gop.h"
#include <iostream>
using namespace std;
GOP::GOP() {
drop_flag=false;
tc_hours=0;
tc_minutes=0;
tc_seconds=0;
tc_pictures=0;
closed_gop=false;
broken_link=false;
mpegExtension=new MpegExtension();
}
GOP::~GOP() {
delete mpegExtension;
}
/*
*--------------------------------------------------------------
*
* ParseGOP --
*
* Parses of group of pictures header from bit stream
* associated with vid_stream.
*
* Results:
* Values in gop header placed into video stream structure.
*
* Side effects:
* Bit stream irreversibly parsed.
*
*--------------------------------------------------------------
*/
int GOP::processGOP(MpegVideoStream* mpegVideoStream) {
unsigned int data;
/* Flush group of pictures start code. */
mpegVideoStream->flushBits(32);
/* Parse off drop frame flag. */
data=mpegVideoStream->getBits(1);
if (data) {
drop_flag = true;
} else
drop_flag = false;
/* Parse off hour component of time code. */
tc_hours=mpegVideoStream->getBits(5);
/* Parse off minute component of time code. */
tc_minutes=mpegVideoStream->getBits(6);
/* Flush marker bit. */
mpegVideoStream->flushBits(1);
/* Parse off second component of time code. */
tc_seconds=mpegVideoStream->getBits(6);
/* Parse off picture count component of time code. */
tc_pictures=mpegVideoStream->getBits(6);
/* Parse off closed gop and broken link flags. */
data=mpegVideoStream->getBits(2);
if (data > 1) {
closed_gop = true;
if (data > 2) {
broken_link = true;
} else
broken_link = false;
} else {
closed_gop = false;
if (data) {
broken_link = true;
} else
broken_link = false;
}
/*
* If next start code is extension/user start code,
* parse off extension data.
*/
mpegExtension->processExtensionData(mpegVideoStream);
return true;
}
int GOP::substract(GOP* minus,GOP* dest) {
int hours;
int minutes;
int seconds;
hours=getHour()-minus->getHour();
minutes=getMinutes()-minus->getMinutes();
seconds=getSeconds()-minus->getSeconds();
if (seconds < 0) {
seconds+=60;
minutes--;
}
if (minutes < 0) {
minutes+=60;
hours--;
}
dest->tc_hours=hours;
dest->tc_minutes=minutes;
dest->tc_seconds=seconds;
if (hours < 0) {
return false;
}
return true;
}
void GOP::copyTo(GOP* dest) {
dest->tc_hours=getHour();
dest->tc_minutes=getMinutes();
dest->tc_seconds=getSeconds();
dest->drop_flag=getDropFlag();
dest->tc_pictures=getPictures();
dest->closed_gop=getClosedGOP();
dest->broken_link=getBrokenLink();
// currently do not copy ext/user data FIX ME
}
void GOP::print(const char* description) {
cout << "GOP [START]:"<<description<<endl;
cout << "tc_hours:"<<getHour()<<endl;
cout << "tc_minutes:"<<getMinutes()<<endl;
cout << "tc_seconds:"<<getSeconds()<<endl;
cout << "drop_flag:"<<getDropFlag()<<endl;
cout << "tc_pictures:"<<getPictures()<<endl;
cout << "closed_gop:"<<getClosedGOP()<<endl;
cout << "broken_link:"<<getBrokenLink()<<endl;
cout << "GOP [END]"<<endl;
}
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