| /* |
| * |
| * 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, mode, 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; |
| 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 ((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; |
| } |