You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.0 KiB
94 lines
2.0 KiB
15 years ago
|
/*
|
||
|
|
mpg I video/audio player plugin
|
||
|
|
Copyright (C) 1999 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
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef __MPEGVIDEOLENGTH_H
|
||
|
|
#define __MPEGVIDEOLENGTH_H
|
||
|
|
|
||
|
|
#include "../input/inputPlugin.h"
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
This class calculates the length (in seconds) of an mpeg stream.
|
||
|
|
I do not know how to make it right, my approach
|
||
|
|
seeks at the beginning of the stream for the timecode in
|
||
|
|
the picture gop then jumps near the end and does the same.
|
||
|
|
then it substracts the values.
|
||
|
|
It has some limitations, it does not seek higher than 600 MB,
|
||
|
|
because it seems the kernel has some problems with this.
|
||
|
|
(It resets the scsi system, and sometimes hang/crash)
|
||
|
|
Thus it only seek near 600 and assumes linear relation
|
||
|
|
for the rest. (Means: it calculates the length of the rest
|
||
|
|
with the sec/mb value calculates from the 600 mb
|
||
|
|
should be exact enough.
|
||
|
|
*/
|
||
|
|
|
||
|
|
class MpegVideoStream;
|
||
|
|
class MpegVideoHeader;
|
||
|
|
class MpegSystemStream;
|
||
|
|
class MpegSystemHeader;
|
||
|
|
class GOP;
|
||
|
|
|
||
|
|
class MpegVideoLength {
|
||
|
|
|
||
|
|
// these are used fo non system streams
|
||
|
|
MpegVideoHeader* mpegVideoHeader;
|
||
|
|
MpegVideoStream* mpegVideoStream;
|
||
|
|
|
||
|
|
// these for system streams
|
||
|
|
MpegSystemHeader* mpegSystemHeader;
|
||
|
|
MpegSystemStream* mpegSystemStream;
|
||
|
|
|
||
|
|
|
||
|
|
InputStream* input;
|
||
|
|
GOP* startGOP;
|
||
|
|
GOP* endGOP;
|
||
|
|
GOP* lengthGOP;
|
||
|
|
|
||
|
|
|
||
|
|
int lHasStart;
|
||
|
|
int lHasEnd;
|
||
|
|
int lCanSeek;
|
||
|
|
int lHasStream;
|
||
|
|
int lHasSystemStream;
|
||
|
|
int lHasRawStream;
|
||
|
|
int lHasResync;
|
||
|
|
int lSysLayer;
|
||
|
|
long upperEnd;
|
||
|
|
long realLength;
|
||
|
|
|
||
|
|
public:
|
||
|
|
MpegVideoLength(InputStream* input);
|
||
|
|
~MpegVideoLength();
|
||
|
|
|
||
|
|
int firstInitialize();
|
||
|
|
|
||
|
|
long getLength();
|
||
|
|
long getSeekPos(int seconds);
|
||
|
|
|
||
|
|
|
||
|
|
private:
|
||
|
|
int seekToStart();
|
||
|
|
int seekToEnd();
|
||
|
|
int seekValue(unsigned int code,long& endPos);
|
||
|
|
int parseToGOP(GOP* gop);
|
||
|
|
int parseToPTS(GOP* gop);
|
||
|
|
|
||
|
|
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
|