diff options
| -rw-r--r-- | sbc/Makefile.am | 6 | ||||
| -rw-r--r-- | sbc/sbcdec.c | 33 | ||||
| -rw-r--r-- | sbc/sbcenc.c | 33 | ||||
| -rw-r--r-- | sbc/sbcinfo.c | 300 |
4 files changed, 372 insertions, 0 deletions
diff --git a/sbc/Makefile.am b/sbc/Makefile.am index 9478d120..d17a77d0 100644 --- a/sbc/Makefile.am +++ b/sbc/Makefile.am @@ -3,4 +3,10 @@ noinst_LTLIBRARIES = libsbc.la libsbc_la_SOURCES = sbc.h sbc.c +noinst_PROGRAMS = sbcinfo sbcdec sbcenc + +sbcdec_LDADD = libsbc.la + +sbcenc_LDADD = libsbc.la + MAINTAINERCLEANFILES = Makefile.in diff --git a/sbc/sbcdec.c b/sbc/sbcdec.c new file mode 100644 index 00000000..208cdfd8 --- /dev/null +++ b/sbc/sbcdec.c @@ -0,0 +1,33 @@ +/* + * + * Bluetooth low-complexity, subband codec (SBC) library + * + * Copyright (C) 2004-2007 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 "sbc.h" + +int main(int argc, char *argv[]) +{ + return 0; +} diff --git a/sbc/sbcenc.c b/sbc/sbcenc.c new file mode 100644 index 00000000..208cdfd8 --- /dev/null +++ b/sbc/sbcenc.c @@ -0,0 +1,33 @@ +/* + * + * Bluetooth low-complexity, subband codec (SBC) library + * + * Copyright (C) 2004-2007 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 "sbc.h" + +int main(int argc, char *argv[]) +{ + return 0; +} diff --git a/sbc/sbcinfo.c b/sbc/sbcinfo.c new file mode 100644 index 00000000..e34f5618 --- /dev/null +++ b/sbc/sbcinfo.c @@ -0,0 +1,300 @@ +/* + * + * Bluetooth low-complexity, subband codec (SBC) library + * + * Copyright (C) 2004-2007 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> + +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)); + +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, mode, method; + int n, p1, p2, fd, len, size, count, num; + + 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; + mode = hdr.channel_mode; + 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 (len < sizeof(hdr) || hdr.syncword != 0x9c) { + fprintf(stderr, "Corrupted SBC stream (len %d 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; +} |