Ballofsnow: New page:

 /*    find field order by reading vob file      start code: 00 00 01 B5   picture coding extension id: 8   field order in fourth byte after start code, first bit. tff=1, bff=...

2007-08-02T07:33:42Z

New page: <pre><nowiki> /* find field order by reading vob file start code: 00 00 01 B5 picture coding extension id: 8 field order in fourth byte after start code, first bit. tff=1, bff=...

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<pre><nowiki>
/*

find field order by reading vob file

start code: 00 00 01 B5
picture coding extension id: 8
field order in fourth byte after start code, first bit. tff=1, bff=0

author: ballofsnow
date: 2 August 2007
license: none (public domain)
target: win32 (MINGW), recommend using the free IDE from bloodshed.net
version: beta 0.1

big thanks to DJ Grenola

*/

#define LARGE_FILE_SUPPORT
#ifdef LARGE_FILE_SUPPORT
/* not necessary for mingw/win32 but will probably become so if we start
trying to compile it on linux and friends */
#define _FILE_OFFSET_BITS 64
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <bitset>
using namespace std;

/* #define VERBOSE */
#define BUFSIZE 1024*1024
#define STARTCODE_LEN 4
#define STARTCODE { 0x00, 0x00, 0x01, 0xB5 }

#ifdef LARGE_FILE_SUPPORT
#define FOPEN fopen64
#define FSEEK fseeko64
#define FTELL ftello64
#define OFF_T off64_t
#else
#define FOPEN fopen
#define FSEEK fseek
#define FTELL ftell
#define OFF_T int
#endif

typedef long long int s64;

void usage(char *argv0);
unsigned char startcode[STARTCODE_LEN]=STARTCODE;
unsigned char buffer[BUFSIZE];

int main (int argc, char **argv) {
FILE *vob;
unsigned int bufstart=0;
unsigned int bytes_to_read;
unsigned int error=0;
unsigned char idlo[1]= { 0x80 };
unsigned char idhi[1]= { 0x8F };

s64 br;
OFF_T pos=0,tmp64;
char *vobname=NULL;
printf ("Determine field order\n");
printf ("beta 0.1, ballofsnow\n");
printf ("This software comes with no warranty.\n");
printf ("Returns 1 for TFF, 0 for BFF.\n");

if (argc!=2) {
usage(argv[0]);
return -1;
}

vobname=argv[1];
if ((vob=FOPEN(vobname,"rb"))==NULL) {
printf ("[-] Failed to open file \"%s\".\n", vobname);
return -1;
}
printf ("[+] Using %u KiB chunks.\n", BUFSIZE/1024);
printf ("[+] Scanning file \"%s\".\n", vobname);
while (~0) {
int i;
bytes_to_read=BUFSIZE-bufstart;
br=fread(buffer+bufstart,1,bytes_to_read,vob);
pos+=br;
#ifdef VERBOSE
printf ("[+] Read %llu bytes.\n", pos);
#endif
for (i=0;i<br+bufstart;i++) {
if (!memcmp(startcode,buffer+i,STARTCODE_LEN)) {
if ( memcmp(buffer+i+4,idlo,1)>=0 && memcmp(buffer+i+4,idhi,1)<=0 ) {
/* MASK THE BYTE TO GET THE RELEVANT BITS */
bitset<CHAR_BIT> fo (buffer[i+7]);
fo &= 0x80;
if (fo == 0x00) {
printf ("BFF\n");
free(buffer);
fclose(vob);
return 0;
}
else if (fo == 0x80) {
printf ("TFF\n");
free(buffer);
fclose(vob);
return 1;
}
}
}
}
bufstart=STARTCODE_LEN-1;
memmove(buffer,buffer+(BUFSIZE-(STARTCODE_LEN-1)),STARTCODE_LEN-1);
if (br!=bytes_to_read)
break;
}
printf("Didn't find TFF flag!");
free(buffer);
fclose(vob);
return -1;
}

void usage(char *argv0) {
printf ("Usage: %s <VOB file>\n\n", argv0);
}
</nowiki></pre>

Anri-chan/Source/fieldorder.cpp - Revision history

Ballofsnow: New page:
/* find field order by reading vob file start code: 00 00 01 B5 picture coding extension id: 8 field order in fourth byte after start code, first bit. tff=1, bff=...