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-rw-r--r--sbc/sbcdec.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/sbc/sbcdec.c b/sbc/sbcdec.c
new file mode 100644
index 0000000..7008e88
--- /dev/null
+++ b/sbc/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.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;
+}
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