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// avi-fix v0.1 (C) A'rpi, license GPL
// simple tool to fix chunk sizes in a RIFF AVI file
// it doesn't check/fix index, use mencoder -forceidx -oac copy -ovc copy to fix index!
#include "config.h"
#ifdef MP_DEBUG
#define mp_debug(...) printf(__VA_ARGS__)
#else
#define mp_debug(...)
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define FCC(a,b,c,d) (((a)<<24)|((b)<<16)|((c)<<8)|(d))
static inline xx(unsigned char c){
if(c>=32 && c<128) return c;
return '?';
}
static inline unsigned int getid(FILE* f){
unsigned int id;
id=fgetc(f);
id=(id<<8)|fgetc(f);
id=(id<<8)|fgetc(f);
id=(id<<8)|fgetc(f);
return id;
}
int main(int argc,char* argv[]){
//FILE* f=fopen("edgar.avi","rb"); // readonly (report errors)
//FILE* f=fopen("edgar.avi","rb+"); // fix mode (fix chunk sizes)
unsigned int lastgood=0;
unsigned int fixat=0;
unsigned int offset=0;
int fix_flag=0;
FILE* f;
if(argc<=1){
printf("Usage: %s [-fix] badfile.avi\n",argv[0]);
exit(1);
}
if(!strcmp(argv[1],"-fix")){
fix_flag=1;
f=fopen(argv[argc-1],"rb+");
} else
f=fopen(argv[argc-1],"rb");
if(!f){
perror("error");
printf("couldnt open '%s'\n",argv[argc-1]);
exit(2);
}
while(1){
unsigned int id,len;
again:
id=fgetc(f);
id=(id<<8)|fgetc(f);
id=(id<<8)|fgetc(f);
faszom:
if(feof(f)) break;
// if(!lastgood && feof(f)) break;
id=(id<<8)|fgetc(f);
// lastgood=ftell(f);
mp_debug("%08X: %c%c%c%c\n",(int)ftell(f)-4,xx(id>>24),xx(id>>16),xx(id>>8),xx(id));
switch(id){
case FCC('R','I','F','F'):
fread(&len,4,1,f); // filesize
id=getid(f); // AVI
mp_debug("RIFF header, filesize=0x%X format=%c%c%c%c\n",len,xx(id>>24),xx(id>>16),xx(id>>8),xx(id));
break;
case FCC('L','I','S','T'):
fread(&len,4,1,f); // size
id=getid(f); // AVI
mp_debug("LIST size=0x%X format=%c%c%c%c\n",len,xx(id>>24),xx(id>>16),xx(id>>8),xx(id));
//case FCC('h','d','r','l'):
//case FCC('s','t','r','l'):
//case FCC('o','d','m','l'):
//case FCC('m','o','v','i'):
break;
// legal chunk IDs:
case FCC('a','v','i','h'): // avi header
case FCC('s','t','r','h'): // stream header
case FCC('s','t','r','f'): // stream format
case FCC('J','U','N','K'): // official shit
// index:
case FCC('i','d','x','1'): // main index??
case FCC('d','m','l','h'): // opendml header
case FCC('i','n','d','x'): // opendml main index??
case FCC('i','x','0','0'): // opendml sub index??
case FCC('i','x','0','1'): // opendml sub index??
// data:
case FCC('0','1','w','b'): // audio track #1
case FCC('0','2','w','b'): // audio track #2
case FCC('0','3','w','b'): // audio track #3
case FCC('0','0','d','b'): // uncompressed video
case FCC('0','0','d','c'): // compressed video
case FCC('0','0','_','_'): // A-V interleaved (type2 DV file)
// info:
case FCC('I','S','F','T'): // INFO: software
case FCC('I','S','R','C'): // INFO: source
case FCC('I','N','A','M'): // INFO: name
case FCC('I','S','B','J'): // INFO: subject
case FCC('I','A','R','T'): // INFO: artist
case FCC('I','C','O','P'): // INFO: copyright
case FCC('I','C','M','T'): // INFO: comment
lastgood=ftell(f);
if(fixat && fix_flag){
// fix last chunk's size field:
fseek(f,fixat,SEEK_SET);
len=lastgood-fixat-8;
mp_debug("Correct len to 0x%X\n",len);
fwrite(&len,4,1,f);
fseek(f,lastgood,SEEK_SET);
fixat=0;
}
fread(&len,4,1,f); // size
mp_debug("ID ok, chunk len=0x%X\n",len);
len+=len&1; // align at 2
fseek(f,len,SEEK_CUR); // skip data
break;
default:
if(!lastgood){
++offset;
mp_debug("invalid ID, trying %d byte offset\n",offset);
goto faszom; // try again @ next post
}
mp_debug("invalid ID, parsing next chunk's data at 0x%X\n",lastgood);
fseek(f,lastgood,SEEK_SET);
fixat=lastgood;
lastgood=0;
goto again;
}
offset=0;
}
return 0;
}
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