// 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 <mplaylib.h>#include <mplaylib.h>#include <mplaylib.h>#define FCC(a,b,c,d)  (((a)<<24)|((b)<<16)|((c)<<8)|(d))static inline char 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;}