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/*
* avisubdump
*
* avi vobsub subtitle stream dumper (c) 2004 Tobias Diedrich
* Licensed under GNU GPLv2 or (at your option) any later version.
*
* The subtitles are dumped to stdout.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#define FCC(a,b,c,d) (((a))|((b)<<8)|((c)<<16)|((d)<<24))
#define FCC_RIFF FCC('R','I','F','F')
#define FCC_LIST FCC('L','I','S','T')
#define FCC_strh FCC('s','t','r','h')
#define FCC_txts FCC('t','x','t','s')
#define FCC_GAB2 FCC('G','A','B','2')
#define GAB_LANGUAGE 0
#define GAB_ENTRY 1
#define GAB_LANGUAGE_UNICODE 2
#define GAB_ENTRY_UNICODE 3
#define GAB_RAWTEXTSUBTITLE 4
static unsigned int getle16(FILE* f){
unsigned int res;
res = fgetc(f);
res |= fgetc(f) << 8;
return res;
}
static unsigned int getle(FILE* f){
unsigned int res;
res = fgetc(f);
res |= fgetc(f) << 8;
res |= fgetc(f) << 16;
res |= fgetc(f) << 24;
return res;
}
static void skip(FILE *f, int len)
{
if (f != stdin) {
fseek(f,len,SEEK_CUR);
} else {
void *buf = malloc(len);
fread(buf,len,1,f);
free(buf);
}
}
static int stream_id(unsigned int id)
{
char c1,c2;
c1 = (char)(id & 0xff);
c2 = (char)((id >> 8) & 0xff);
if (c1 >= '0' && c1 <= '9' &&
c2 >= '0' && c2 <= '9') {
c1 -= '0';
c2 -= '0';
return c1*10+c2;
}
return -1;
}
static int dumpsub_gab2(FILE *f, int size) {
int ret = 0;
while (ret + 6 <= size) {
unsigned int len, id;
char *buf;
int i;
id = getle16(f); ret += 2;
len = getle(f); ret += 4;
if (ret + len > size) break;
buf = malloc(len);
ret += fread(buf, 1, len, f);
switch (id) {
case GAB_LANGUAGE_UNICODE: /* FIXME: convert to utf-8; endianness */
for (i=0; i<len; i++) buf[i] = buf[i*2];
case GAB_LANGUAGE:
fprintf(stderr, "LANGUAGE: %s\n", buf);
break;
case GAB_ENTRY_UNICODE: /* FIXME: convert to utf-8; endianness */
for (i=0; i<len; i++) buf[i] = buf[i*2];
case GAB_ENTRY:
fprintf(stderr, "ENTRY: %s\n", buf);
break;
case GAB_RAWTEXTSUBTITLE:
printf("%s", buf);
break;
default:
fprintf(stderr, "Unknown type %d, len %d\n", id, len);
break;
}
free(buf);
}
return ret;
}
static void dump(FILE *f) {
unsigned int id, len;
int stream = 0;
int substream = -2;
while (1) {
id = getle(f);
len = getle(f);
if(feof(f)) break;
if (id == FCC_RIFF ||
id == FCC_LIST) {
getle(f);
continue;
} else if (id == FCC_strh) {
id = getle(f); len -= 4;
fprintf(stderr, "Stream %d is %c%c%c%c",
stream,
id,
id >> 8,
id >> 16,
id >> 24);
if (id == FCC_txts) {
substream = stream;
fprintf(stderr, " (subtitle stream)");
}
fprintf(stderr, ".\n");
stream++;
} else if (stream_id(id) == substream) {
unsigned int subid;
subid = getle(f); len -= 4;
if (subid != FCC_GAB2) {
fprintf(stderr,
"Unknown subtitle chunk %c%c%c%c (%08x).\n",
id, id >> 8, id >> 16, id >> 24, subid);
} else {
skip(f,1); len -= 1;
len -= dumpsub_gab2(f, len);
}
}
len+=len&1;
skip(f,len);
}
}
int main(int argc,char* argv[])
{
FILE* f;
if (argc != 2) {
fprintf(stderr, "Usage: %s <avi>\n", argv[0]);
exit(1);
}
if (strcmp(argv[argc-1], "-") == 0) f=stdin;
else f=fopen(argv[argc-1],"rb");
if (!f) {
fprintf(stderr, "Could not open '%s': %s\n",
argv[argc-1], strerror(errno));
exit(-errno);
}
dump(f);
return 0;
}
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