[skanman]

Sorry I didn't post this back in 2010. I was busy going through a nasty divorce and my ex-wife hid my cars.

---

/*
* BMWCONV v0.10 - BMW Audio File Converter
*
* Converts BMW audio files (BR3/BR4/BR5) to/from regular audio files (MP4/MP3/WMA)
*
* Written quickly by Justin Newman <180ring@gmail.com>
*
* No license, it's public domain (feel free to do what you want with it)
*
* This code should convert the above-mentioned audio files to/from each other. I
* wrote and built this code under Cygwin on Windows XP. It should build/run on
* most Windows releases with or without Cygwin. It should also build/run on most
* Linux and Mac distros/releases. I did a quick test on Debian and it worked fine.
*
* To build, go to the directory with this code and type:
*
* gcc bmwconv.c -o bmwconv
*
* If gcc does not exist, you may need to install it. If you run into errors
* compiling, you may need to fix them.
*
* This code has not been fully tested, but it should work. I tested this code with
* my 2013 BMW 550i and 2010 BMW 535i. It converted to/from without any issues. The
* export capability does not exist on my 2006 BMW 330i.
*
* If you need to process a lot of files, multiple directories, etc, just write a
* small script that passes the directory and name of each file to this code. It is
* very easy to do.
*
* WARNING: Use at your own risk. Only operate on backup files in a safe directory.
* This code will overwrite files with the same name.
*
*/

#include <stdio.h>
#include <string.h>

void usage() {
printf("bmwconv v0.10 - converts bmw's audio files (br3/br4/br5) to/from regular audio files (mp4/mp3/wma)\n");
printf("written quickly by justin newman <180ring@gmail.com> - no license, it's public domain\n");
printf("\n");
printf("usage: bmwconv [options] <input.ext> [output.ext]\n");
printf("\n");
printf("options:\n");
printf(" -h | --help shows this help screen\n");
printf("\n");
printf("mapping:\n");
printf(" br3 = mp4\n");
printf(" br4 = mp3\n");
printf(" br5 = wma\n");
printf("\n");
printf("example: bmwconv depeche_mode_enjoy_the_silence.BR4\n");
printf(" (converts to depeche_mode_enjoy_the_silence.mp3)\n");
printf("\n");
printf("note: use correct input ext or output ext will be wrong\n");
}

char *swapext(char *ext, char *buf, int maxlen) {

if (!buf) {
return NULL;
}

buf[0] = '\0';

if (!ext) {
return buf;
}

if (!strcasecmp(ext, "BR3")) {
strncpy(buf, "mp4", maxlen);
} else if (!strcasecmp(ext, "BR4")) {
strncpy(buf, "mp3", maxlen);
} else if (!strcasecmp(ext, "BR5")) {
strncpy(buf, "wma", maxlen);
} else if (!strcasecmp(ext, "mp4")) {
strncpy(buf, "BR3", maxlen);
} else if (!strcasecmp(ext, "mp3")) {
strncpy(buf, "BR4", maxlen);
} else if (!strcasecmp(ext, "wma")) {
strncpy(buf, "BR5", maxlen);
}

return buf;
}

int main(int argc, char **argv) {

FILE *fpi, *fpo;
char input[256] = "\0";
char output[256] = "\0";
char ext[256] = "\0";
char buf[1024] = "\0";
char *p;
int i, l, c;

for (i = 1; i < argc; i++) {
if (*argv[i] != '-' && *argv[i] != '/') {
break;
}
if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")) {
usage();
return 0;
} else {
printf("error: invalid option specified\n");
return -1;
}
}

if (i >= argc) {
printf("error: missing input filename\n");
return -1;
}

strncpy(input, argv[1], sizeof(input));
strncpy(output, (argc > 2) ? argv[2] : input, sizeof(output));

if (argc < 3) {
if ((p = strrchr(output, '.')) != NULL) {
*p++ = '\0';
}
swapext(p, ext, sizeof(ext));
if (strlen(ext) < 1) {
printf("error: cannot figure file type from input ext\n");
return -1;
}
strncat(output, ".", sizeof(output) - strlen(output));
strncat(output, ext, sizeof(output) - strlen(output));
}

if ((fpi = fopen(input, "rb")) == NULL) {
printf("error: could not open input \"%s\"\n", input);
return -1;
}

unlink(output);
if ((fpo = fopen(output, "wb")) == NULL) {
printf("error: could not open output \"%s\"\n", output);
return -1;
}

while (!feof(fpi)) {
l = fread(buf, 1, sizeof(buf), fpi);
if (l < 1) {
break;
}
for (i = 0; i < l; i++) {
c = ~(buf[i] & 0xff) & 0xff;
buf[i] = c;
}
fwrite(buf, 1, l, fpo);
}

fflush(fpo);
fclose(fpo);

fclose(fpi);

return 0;
}