/* * *  Bluetooth low-complexity, subband codec (SBC) decoder * *  Copyright (C) 2004-2008  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 8192static 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, len;	int format = AFMT_S16_BE, frequency, channels;	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.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;	}	printf("%d Hz, %d channels\n", frequency, 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, &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 = 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 + 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 (%d)\n", BUF_SIZE, len + count);			exit(1);		}		/* increase the count */		count += 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,					buf + count, sizeof(buf) - 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) 2004-2008  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;}