src: Move subband encoder, decoder and info tools

4 files changed, 977 insertions, 0 deletions

diff --git a/src/formats.h b/src/formats.h
new file mode 100644
index 0000000..3050b25
--- /dev/null
+++ b/src/formats.h
@@ -0,0 +1,55 @@
+/*
+ *
+ *  Bluetooth low-complexity, subband codec (SBC) library
+ *
+ *  Copyright (C) 2004-2010  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
+ *
+ */
+
+#include <byteswap.h>
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define COMPOSE_ID(a,b,c,d)	((a) | ((b)<<8) | ((c)<<16) | ((d)<<24))
+#define LE_SHORT(v)		(v)
+#define LE_INT(v)		(v)
+#define BE_SHORT(v)		bswap_16(v)
+#define BE_INT(v)		bswap_32(v)
+#elif __BYTE_ORDER == __BIG_ENDIAN
+#define COMPOSE_ID(a,b,c,d)	((d) | ((c)<<8) | ((b)<<16) | ((a)<<24))
+#define LE_SHORT(v)		bswap_16(v)
+#define LE_INT(v)		bswap_32(v)
+#define BE_SHORT(v)		(v)
+#define BE_INT(v)		(v)
+#else
+#error "Wrong endian"
+#endif
+
+#define AU_MAGIC		COMPOSE_ID('.','s','n','d')
+
+#define AU_FMT_ULAW		1
+#define AU_FMT_LIN8		2
+#define AU_FMT_LIN16		3
+
+struct au_header {
+	uint32_t magic;		/* '.snd' */
+	uint32_t hdr_size;	/* size of header (min 24) */
+	uint32_t data_size;	/* size of data */
+	uint32_t encoding;	/* see to AU_FMT_XXXX */
+	uint32_t sample_rate;	/* sample rate */
+	uint32_t channels;	/* number of channels (voices) */
+};
diff --git a/src/sbcdec.c b/src/sbcdec.c
new file mode 100644
index 0000000..0077a82
--- /dev/null
+++ b/src/sbcdec.c
@@ -0,0 +1,293 @@
+/*
+ *
+ *  Bluetooth low-complexity, subband codec (SBC) decoder
+ *
+ *  Copyright (C) 2008-2010  Nokia Corporation
+ *  Copyright (C) 2004-2010  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/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) 2004-2010  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':
+			free(output);
+			output = strdup(optarg);
+			tofile = 0;
+			break;
+
+		case 'f' :
+			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);
+
+	free(output);
+
+	return 0;
+}
diff --git a/src/sbcenc.c b/src/sbcenc.c
new file mode 100644
index 0000000..a723b03
--- /dev/null
+++ b/src/sbcenc.c
@@ -0,0 +1,308 @@
+/*
+ *
+ *  Bluetooth low-complexity, subband codec (SBC) encoder
+ *
+ *  Copyright (C) 2008-2010  Nokia Corporation
+ *  Copyright (C) 2004-2010  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 <stdint.h>
+#include <string.h>
+#include <getopt.h>
+#include <sys/stat.h>
+
+#include "sbc/sbc.h"
+#include "formats.h"
+
+static int verbose = 0;
+
+#define BUF_SIZE 32768
+static unsigned char input[BUF_SIZE], output[BUF_SIZE + BUF_SIZE / 4];
+
+static void encode(char *filename, int subbands, int bitpool, int joint,
+					int dualchannel, int snr, int blocks)
+{
+	struct au_header au_hdr;
+	sbc_t sbc;
+	int fd, size, srate, codesize, nframes;
+	ssize_t encoded;
+	ssize_t len;
+
+	if (sizeof(au_hdr) != 24) {
+		/* Sanity check just in case */
+		fprintf(stderr, "FIXME: sizeof(au_hdr) != 24\n");
+		return;
+	}
+
+	if (strcmp(filename, "-")) {
+		fd = open(filename, O_RDONLY);
+		if (fd < 0) {
+			fprintf(stderr, "Can't open file %s: %s\n",
+						filename, strerror(errno));
+			return;
+		}
+	} else
+		fd = fileno(stdin);
+
+	len = read(fd, &au_hdr, sizeof(au_hdr));
+	if (len < (ssize_t) sizeof(au_hdr)) {
+		if (fd > fileno(stderr))
+			fprintf(stderr, "Can't read header from file %s: %s\n",
+						filename, strerror(errno));
+		else
+			perror("Can't read audio header");
+		goto done;
+	}
+
+	if (au_hdr.magic != AU_MAGIC ||
+			BE_INT(au_hdr.hdr_size) > 128 ||
+			BE_INT(au_hdr.hdr_size) < sizeof(au_hdr) ||
+			BE_INT(au_hdr.encoding) != AU_FMT_LIN16) {
+		fprintf(stderr, "Not in Sun/NeXT audio S16_BE format\n");
+		goto done;
+	}
+
+	sbc_init(&sbc, 0L);
+
+	switch (BE_INT(au_hdr.sample_rate)) {
+	case 16000:
+		sbc.frequency = SBC_FREQ_16000;
+		break;
+	case 32000:
+		sbc.frequency = SBC_FREQ_32000;
+		break;
+	case 44100:
+		sbc.frequency = SBC_FREQ_44100;
+		break;
+	case 48000:
+		sbc.frequency = SBC_FREQ_48000;
+		break;
+	}
+
+	srate = BE_INT(au_hdr.sample_rate);
+
+	sbc.subbands = subbands == 4 ? SBC_SB_4 : SBC_SB_8;
+
+	if (BE_INT(au_hdr.channels) == 1) {
+		sbc.mode = SBC_MODE_MONO;
+		if (joint || dualchannel) {
+			fprintf(stderr, "Audio is mono but joint or "
+				"dualchannel mode has been specified\n");
+			goto done;
+		}
+	} else if (joint && !dualchannel)
+		sbc.mode = SBC_MODE_JOINT_STEREO;
+	else if (!joint && dualchannel)
+		sbc.mode = SBC_MODE_DUAL_CHANNEL;
+	else if (!joint && !dualchannel)
+		sbc.mode = SBC_MODE_STEREO;
+	else {
+		fprintf(stderr, "Both joint and dualchannel mode have been "
+								"specified\n");
+		goto done;
+	}
+
+	sbc.endian = SBC_BE;
+	/* Skip extra bytes of the header if any */
+	if (read(fd, input, BE_INT(au_hdr.hdr_size) - len) < 0)
+		goto done;
+
+	sbc.bitpool = bitpool;
+	sbc.allocation = snr ? SBC_AM_SNR : SBC_AM_LOUDNESS;
+	sbc.blocks = blocks == 4 ? SBC_BLK_4 :
+			blocks == 8 ? SBC_BLK_8 :
+				blocks == 12 ? SBC_BLK_12 : SBC_BLK_16;
+
+	if (verbose) {
+		fprintf(stderr, "encoding %s with rate %d, %d blocks, "
+			"%d subbands, %d bits, allocation method %s, "
+							"and mode %s\n",
+			filename, srate, blocks, subbands, bitpool,
+			sbc.allocation == SBC_AM_SNR ? "SNR" : "LOUDNESS",
+			sbc.mode == SBC_MODE_MONO ? "MONO" :
+					sbc.mode == SBC_MODE_STEREO ?
+						"STEREO" : "JOINTSTEREO");
+	}
+
+	codesize = sbc_get_codesize(&sbc);
+	nframes = sizeof(input) / codesize;
+	while (1) {
+		unsigned char *inp, *outp;
+		/* read data for up to 'nframes' frames of input data */
+		size = read(fd, input, codesize * nframes);
+		if (size < 0) {
+			/* Something really bad happened */
+			perror("Can't read audio data");
+			break;
+		}
+		if (size < codesize) {
+			/* Not enough data for encoding even a single frame */
+			break;
+		}
+		/* encode all the data from the input buffer in a loop */
+		inp = input;
+		outp = output;
+		while (size >= codesize) {
+			len = sbc_encode(&sbc, inp, codesize,
+				outp, sizeof(output) - (outp - output),
+				&encoded);
+			if (len != codesize || encoded <= 0) {
+				fprintf(stderr,
+					"sbc_encode fail, len=%zd, encoded=%lu\n",
+					len, (unsigned long) encoded);
+				break;
+			}
+			size -= len;
+			inp += len;
+			outp += encoded;
+		}
+		len = write(fileno(stdout), output, outp - output);
+		if (len != outp - output) {
+			perror("Can't write SBC output");
+			break;
+		}
+		if (size != 0) {
+			/*
+			 * sbc_encode failure has been detected earlier or end
+			 * of file reached (have trailing partial data which is
+			 * insufficient to encode SBC frame)
+			 */
+			break;
+		}
+	}
+
+	sbc_finish(&sbc);
+
+done:
+	if (fd > fileno(stderr))
+		close(fd);
+}
+
+static void usage(void)
+{
+	printf("SBC encoder utility ver %s\n", VERSION);
+	printf("Copyright (c) 2004-2010  Marcel Holtmann\n\n");
+
+	printf("Usage:\n"
+		"\tsbcenc [options] file(s)\n"
+		"\n");
+
+	printf("Options:\n"
+		"\t-h, --help           Display help\n"
+		"\t-v, --verbose        Verbose mode\n"
+		"\t-s, --subbands       Number of subbands to use (4 or 8)\n"
+		"\t-b, --bitpool        Bitpool value (default is 32)\n"
+		"\t-j, --joint          Joint stereo\n"
+		"\t-d, --dualchannel    Dual channel\n"
+		"\t-S, --snr            Use SNR mode (default is loudness)\n"
+		"\t-B, --blocks         Number of blocks (4, 8, 12 or 16)\n"
+		"\n");
+}
+
+static struct option main_options[] = {
+	{ "help",	0, 0, 'h' },
+	{ "verbose",	0, 0, 'v' },
+	{ "subbands",	1, 0, 's' },
+	{ "bitpool",	1, 0, 'b' },
+	{ "joint",	0, 0, 'j' },
+	{ "dualchannel",0, 0, 'd' },
+	{ "snr",	0, 0, 'S' },
+	{ "blocks",	1, 0, 'B' },
+	{ 0, 0, 0, 0 }
+};
+
+int main(int argc, char *argv[])
+{
+	int i, opt, subbands = 8, bitpool = 32, joint = 0, dualchannel = 0;
+	int snr = 0, blocks = 16;
+
+	while ((opt = getopt_long(argc, argv, "+hvs:b:jdSB:",
+						main_options, NULL)) != -1) {
+		switch(opt) {
+		case 'h':
+			usage();
+			exit(0);
+
+		case 'v':
+			verbose = 1;
+			break;
+
+		case 's':
+			subbands = atoi(optarg);
+			if (subbands != 8 && subbands != 4) {
+				fprintf(stderr, "Invalid subbands\n");
+				exit(1);
+			}
+			break;
+
+		case 'b':
+			bitpool = atoi(optarg);
+			break;
+
+		case 'j':
+			joint = 1;
+			break;
+
+		case 'd':
+			dualchannel = 1;
+			break;
+
+		case 'S':
+			snr = 1;
+			break;
+
+		case 'B':
+			blocks = atoi(optarg);
+			if (blocks != 16 && blocks != 12 &&
+						blocks != 8 && blocks != 4) {
+				fprintf(stderr, "Invalid blocks\n");
+				exit(1);
+			}
+			break;
+
+		default:
+			usage();
+			exit(1);
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+	optind = 0;
+
+	if (argc < 1) {
+		usage();
+		exit(1);
+	}
+
+	for (i = 0; i < argc; i++)
+		encode(argv[i], subbands, bitpool, joint, dualchannel,
+								snr, blocks);
+
+	return 0;
+}
diff --git a/src/sbcinfo.c b/src/sbcinfo.c
new file mode 100644
index 0000000..8cfb54a
--- /dev/null
+++ b/src/sbcinfo.c
@@ -0,0 +1,321 @@
+/*
+ *
+ *  Bluetooth low-complexity, subband codec (SBC) library
+ *
+ *  Copyright (C) 2008-2010  Nokia Corporation
+ *  Copyright (C) 2004-2010  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 <stdint.h>
+#include <string.h>
+#include <libgen.h>
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+struct sbc_frame_hdr {
+	uint8_t syncword:8;		/* Sync word */
+	uint8_t subbands:1;		/* Subbands */
+	uint8_t allocation_method:1;	/* Allocation method */
+	uint8_t channel_mode:2;		/* Channel mode */
+	uint8_t blocks:2;		/* Blocks */
+	uint8_t sampling_frequency:2;	/* Sampling frequency */
+	uint8_t bitpool:8;		/* Bitpool */
+	uint8_t crc_check:8;		/* CRC check */
+} __attribute__ ((packed));
+#elif __BYTE_ORDER == __BIG_ENDIAN
+struct sbc_frame_hdr {
+	uint8_t syncword:8;		/* Sync word */
+	uint8_t sampling_frequency:2;	/* Sampling frequency */
+	uint8_t blocks:2;		/* Blocks */
+	uint8_t channel_mode:2;		/* Channel mode */
+	uint8_t allocation_method:1;	/* Allocation method */
+	uint8_t subbands:1;		/* Subbands */
+	uint8_t bitpool:8;		/* Bitpool */
+	uint8_t crc_check:8;		/* CRC check */
+} __attribute__ ((packed));
+#else
+#error "Unknown byte order"
+#endif
+
+static int calc_frame_len(struct sbc_frame_hdr *hdr)
+{
+	int tmp, nrof_subbands, nrof_blocks;
+
+	nrof_subbands = (hdr->subbands + 1) * 4;
+	nrof_blocks = (hdr->blocks + 1) * 4;
+
+	switch (hdr->channel_mode) {
+	case 0x00:
+		nrof_subbands /= 2;
+		tmp = nrof_blocks * hdr->bitpool;
+		break;
+	case 0x01:
+		tmp = nrof_blocks * hdr->bitpool * 2;
+		break;
+	case 0x02:
+		tmp = nrof_blocks * hdr->bitpool;
+		break;
+	case 0x03:
+		tmp = nrof_blocks * hdr->bitpool + nrof_subbands;
+		break;
+	default:
+		return 0;
+	}
+
+	return (nrof_subbands + ((tmp + 7) / 8));
+}
+
+static double calc_bit_rate(struct sbc_frame_hdr *hdr)
+{
+	int nrof_subbands, nrof_blocks;
+	double f;
+
+	nrof_subbands = (hdr->subbands + 1) * 4;
+	nrof_blocks = (hdr->blocks + 1) * 4;
+
+	switch (hdr->sampling_frequency) {
+	case 0:
+		f = 16;
+		break;
+	case 1:
+		f = 32;
+		break;
+	case 2:
+		f = 44.1;
+		break;
+	case 3:
+		f = 48;
+		break;
+	default:
+		return 0;
+	}
+
+	return ((8 * (calc_frame_len(hdr) + 4) * f) /
+			(nrof_subbands * nrof_blocks));
+}
+
+static char *freq2str(uint8_t freq)
+{
+	switch (freq) {
+	case 0:
+		return "16 kHz";
+	case 1:
+		return "32 kHz";
+	case 2:
+		return "44.1 kHz";
+	case 3:
+		return "48 kHz";
+	default:
+		return "Unknown";
+	}
+}
+
+static char *mode2str(uint8_t mode)
+{
+	switch (mode) {
+	case 0:
+		return "Mono";
+	case 1:
+		return "Dual Channel";
+	case 2:
+		return "Stereo";
+	case 3:
+		return "Joint Stereo";
+	default:
+		return "Unknown";
+	}
+}
+
+static ssize_t __read(int fd, void *buf, size_t count)
+{
+	ssize_t len, pos = 0;
+
+	while (count > 0) {
+		len = read(fd, buf + pos, count);
+		if (len <= 0)
+			return len;
+
+		count -= len;
+		pos   += len;
+	}
+
+	return pos;
+}
+
+#define SIZE 32
+
+static int analyze_file(char *filename)
+{
+	struct sbc_frame_hdr hdr;
+	unsigned char buf[64];
+	double rate;
+	int bitpool[SIZE], frame_len[SIZE];
+	int subbands, blocks, freq, method;
+	int n, p1, p2, fd, size, num;
+	ssize_t len;
+	unsigned int count;
+
+	if (strcmp(filename, "-")) {
+		printf("Filename\t\t%s\n", basename(filename));
+
+		fd = open(filename, O_RDONLY);
+		if (fd < 0) {
+			perror("Can't open file");
+			return -1;
+		}
+	} else
+		fd = fileno(stdin);
+
+	len = __read(fd, &hdr, sizeof(hdr));
+	if (len != sizeof(hdr) || hdr.syncword != 0x9c) {
+		fprintf(stderr, "Not a SBC audio file\n");
+		return -1;
+	}
+
+	subbands = (hdr.subbands + 1) * 4;
+	blocks = (hdr.blocks + 1) * 4;
+	freq = hdr.sampling_frequency;
+	method = hdr.allocation_method;
+
+	count = calc_frame_len(&hdr);
+
+	bitpool[0] = hdr.bitpool;
+	frame_len[0] = count + 4;
+
+	for (n = 1; n < SIZE; n++) {
+		bitpool[n] = 0;
+		frame_len[n] = 0;
+	}
+
+	if (lseek(fd, 0, SEEK_SET) < 0) {
+		num = 1;
+		rate = calc_bit_rate(&hdr);
+		while (count) {
+			size = count > sizeof(buf) ? sizeof(buf) : count;
+			len = __read(fd, buf, size);
+			if (len < 0)
+				break;
+			count -= len;
+		}
+	} else {
+		num = 0;
+		rate = 0;
+	}
+
+	while (1) {
+		len = __read(fd, &hdr, sizeof(hdr));
+		if (len < 0) {
+			fprintf(stderr, "Unable to read frame header"
+					" (error %d)\n", errno);
+			break;
+		}
+
+		if (len == 0)
+			break;
+
+		if ((size_t) len < sizeof(hdr) || hdr.syncword != 0x9c) {
+			fprintf(stderr, "Corrupted SBC stream "
+					"(len %zd syncword 0x%02x)\n",
+					len, hdr.syncword);
+			break;
+		}
+
+		count = calc_frame_len(&hdr);
+		len = count + 4;
+
+		p1 = -1;
+		p2 = -1;
+		for (n = 0; n < SIZE; n++) {
+			if (p1 < 0 && (bitpool[n] == 0 || bitpool[n] == hdr.bitpool))
+				p1 = n;
+			if (p2 < 0 && (frame_len[n] == 0 || frame_len[n] == len))
+				p2 = n;
+		}
+		if (p1 >= 0)
+			bitpool[p1] = hdr.bitpool;
+		if (p2 >= 0)
+			frame_len[p2] = len;
+
+		while (count) {
+			size = count > sizeof(buf) ? sizeof(buf) : count;
+
+			len = __read(fd, buf, size);
+			if (len != size) {
+				fprintf(stderr, "Unable to read frame data "
+						"(error %d)\n", errno);
+				break;
+			}
+
+			count -= len;
+		}
+
+		rate += calc_bit_rate(&hdr);
+		num++;
+	}
+
+	printf("Subbands\t\t%d\n", subbands);
+	printf("Block length\t\t%d\n", blocks);
+	printf("Sampling frequency\t%s\n", freq2str(freq));
+	printf("Channel mode\t\t%s\n", mode2str(hdr.channel_mode));
+	printf("Allocation method\t%s\n", method ? "SNR" : "Loudness");
+	printf("Bitpool\t\t\t%d", bitpool[0]);
+	for (n = 1; n < SIZE; n++)
+		if (bitpool[n] > 0)
+			printf(", %d", bitpool[n]);
+	printf("\n");
+	printf("Number of frames\t%d\n", num);
+	printf("Frame length\t\t%d", frame_len[0]);
+	for (n = 1; n < SIZE; n++)
+		if (frame_len[n] > 0)
+			printf(", %d", frame_len[n]);
+	printf(" Bytes\n");
+	if (num > 0)
+		printf("Bit rate\t\t%.3f kbps\n", rate / num);
+
+	if (fd > fileno(stderr))
+		close(fd);
+
+	printf("\n");
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int i;
+
+	if (argc < 2) {
+		fprintf(stderr, "Usage: sbcinfo <file>\n");
+		exit(1);
+	}
+
+	for (i = 0; i < argc - 1; i++)
+		if (analyze_file(argv[i + 1]) < 0)
+			exit(1);
+
+	return 0;
+}