aboutsummaryrefslogtreecommitdiffhomepage
path: root/TOOLS/avi-fix.c
blob: 19aa55384a4607b83e6923215a4a728550061aec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
// 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 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;
}