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/*
*
* Bluetooth low-complexity, subband codec (SBC) decoder
*
* Copyright (C) 2004-2007 Marcel Holtmann <marcel@holtmann.org>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include "sbc.h"
#define BUF_SIZE 8192
static void decode(char *filename, char *output, int tofile)
{
unsigned char buf[BUF_SIZE], *stream;
struct stat st;
off_t filesize;
sbc_t sbc;
int fd, ad, pos, streamlen, framelen, count, written;
int format = AFMT_S16_BE;
if (stat(filename, &st) < 0) {
fprintf(stderr, "Can't get size of file %s: %s\n",
filename, strerror(errno));
return;
}
filesize = st.st_size;
stream = malloc(st.st_size);
if (!stream) {
fprintf(stderr, "Can't allocate memory for %s: %s\n",
filename, strerror(errno));
return;
}
fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Can't open file %s: %s\n",
filename, strerror(errno));
goto free;
}
if (read(fd, stream, st.st_size) != st.st_size) {
fprintf(stderr, "Can't read content of %s: %s\n",
filename, strerror(errno));
close(fd);
goto free;
}
close(fd);
pos = 0;
streamlen = st.st_size;
if (tofile)
ad = open(output, O_WRONLY | O_CREAT | O_TRUNC, 0644);
else
ad = open(output, O_WRONLY, 0);
if (ad < 0) {
fprintf(stderr, "Can't open output %s: %s\n",
output, strerror(errno));
goto free;
}
sbc_init(&sbc, 0L);
sbc.swap = 1;
framelen = sbc_decode(&sbc, stream, streamlen);
printf("%d Hz, %d channels\n", sbc.rate, sbc.channels);
if (!tofile) {
if (ioctl(ad, SNDCTL_DSP_SETFMT, &format) < 0) {
fprintf(stderr, "Can't set audio format on %s: %s\n",
output, strerror(errno));
goto close;
}
if (ioctl(ad, SNDCTL_DSP_CHANNELS, &sbc.channels) < 0) {
fprintf(stderr,
"Can't set number of channels on %s: %s\n",
output, strerror(errno));
goto close;
}
if (ioctl(ad, SNDCTL_DSP_SPEED, &sbc.rate) < 0) {
fprintf(stderr, "Can't set audio rate on %s: %s\n",
output, strerror(errno));
goto close;
}
}
count = 0;
while (framelen > 0) {
/* we have completed an sbc_decode at this point sbc.len is the
* length of the frame we just decoded count is the number of
* decoded bytes yet to be written */
if (count + sbc.len > BUF_SIZE) {
/* buffer is too full to stuff decoded audio in so it
* must be written to the device */
written = write(ad, buf, count);
if (written > 0)
count -= written;
}
/* sanity check */
if (count + sbc.len > BUF_SIZE) {
fprintf(stderr,
"buffer size of %d is too small for decoded"
" data (%d)\n", BUF_SIZE, sbc.len + count);
exit(1);
}
/* move the latest decoded data into buf and increase
* the count */
memcpy(buf + count, sbc.data, sbc.len);
count += sbc.len;
/* push the pointer in the file forward to the next bit to be
* decoded tell the decoder to decode up to the remaining
* length of the file (!) */
pos += framelen;
framelen = sbc_decode(&sbc, stream + pos, streamlen - pos);
}
if (count > 0) {
written = write(ad, buf, count);
if (written > 0)
count -= written;
}
close:
sbc_finish(&sbc);
close(ad);
free:
free(stream);
}
static void usage(void)
{
printf("SBC decoder utility ver %s\n", VERSION);
printf("Copyright (c) 2004-2007 Marcel Holtmann\n\n");
printf("Usage:\n"
"\tsbcdec [options] file(s)\n"
"\n");
printf("Options:\n"
"\t-h, --help Display help\n"
"\t-v, --verbose Verbose mode\n"
"\t-d, --device <dsp> Sound device\n"
"\t-f, --file <file> Decode to a file\n"
"\n");
}
static struct option main_options[] = {
{ "help", 0, 0, 'h' },
{ "device", 1, 0, 'd' },
{ "verbose", 0, 0, 'v' },
{ "file", 1, 0, 'f' },
{ 0, 0, 0, 0 }
};
int main(int argc, char *argv[])
{
char *output = NULL;
int i, opt, verbose = 0, tofile = 0;
while ((opt = getopt_long(argc, argv, "+hvd:f:", main_options, NULL)) != -1) {
switch(opt) {
case 'h':
usage();
exit(0);
case 'v':
verbose = 1;
break;
case 'd':
if (output)
free(output);
output = strdup(optarg);
tofile = 0;
break;
case 'f' :
if (output)
free(output);
output = strdup(optarg);
tofile = 1;
break;
default:
exit(1);
}
}
argc -= optind;
argv += optind;
optind = 0;
if (argc < 1) {
usage();
exit(1);
}
for (i = 0; i < argc; i++)
decode(argv[i], output ? output : "/dev/dsp", tofile);
if (output)
free(output);
return 0;
}
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