/* * * 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; }