/*
*
* Bluetooth low-complexity, subband codec (SBC) decoder
*
* Copyright (C) 2004-2009 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"
#include "formats.h"
#define BUF_SIZE 8192
static int verbose = 0;
static void decode(char *filename, char *output, int tofile)
{
unsigned char buf[BUF_SIZE], *stream;
struct stat st;
sbc_t sbc;
int fd, ad, pos, streamlen, framelen, count;
size_t len;
int format = AFMT_S16_BE, frequency, channels;
ssize_t written;
if (stat(filename, &st) < 0) {
fprintf(stderr, "Can't get size of file %s: %s\n",
filename, strerror(errno));
return;
}
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.endian = SBC_BE;
framelen = sbc_decode(&sbc, stream, streamlen, buf, sizeof(buf), &len);
channels = sbc.mode == SBC_MODE_MONO ? 1 : 2;
switch (sbc.frequency) {
case SBC_FREQ_16000:
frequency = 16000;
break;
case SBC_FREQ_32000:
frequency = 32000;
break;
case SBC_FREQ_44100:
frequency = 44100;
break;
case SBC_FREQ_48000:
frequency = 48000;
break;
default:
frequency = 0;
}
if (verbose) {
fprintf(stderr,"decoding %s with rate %d, %d subbands, "
"%d bits, allocation method %s and mode %s\n",
filename, frequency, sbc.subbands * 4 + 4, sbc.bitpool,
sbc.allocation == SBC_AM_SNR ? "SNR" : "LOUDNESS",
sbc.mode == SBC_MODE_MONO ? "MONO" :
sbc.mode == SBC_MODE_STEREO ?
"STEREO" : "JOINTSTEREO");
}
if (tofile) {
struct au_header au_hdr;
au_hdr.magic = AU_MAGIC;
au_hdr.hdr_size = BE_INT(24);
au_hdr.data_size = BE_INT(0);
au_hdr.encoding = BE_INT(AU_FMT_LIN16);
au_hdr.sample_rate = BE_INT(frequency);
au_hdr.channels = BE_INT(channels);
written = write(ad, &au_hdr, sizeof(au_hdr));
if (written < (ssize_t) sizeof(au_hdr)) {
fprintf(stderr, "Failed to write header\n");
goto close;
}
} else {
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, &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, &frequency) < 0) {
fprintf(stderr, "Can't set audio rate on %s: %s\n",
output, strerror(errno));
goto close;
}
}
count = len;
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 + 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 + len >= BUF_SIZE) {
fprintf(stderr,
"buffer size of %d is too small for decoded"
" data (%lu)\n", BUF_SIZE, (unsigned long) (len + count));
exit(1);
}
/* 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,
buf + count, sizeof(buf) - count, &len);
/* increase the count */
count += len;
}
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) 2004-2009 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, 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;
}