1 /* 2 * 3 * Bluetooth low-complexity, subband codec (SBC) decoder 4 * 5 * Copyright (C) 2008-2010 Nokia Corporation 6 * Copyright (C) 2004-2010 Marcel Holtmann <marcel (at) holtmann.org> 7 * 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 22 * 23 */ 24 25 #ifdef HAVE_CONFIG_H 26 #include <config.h> 27 #endif 28 29 #include <stdio.h> 30 #include <errno.h> 31 #include <fcntl.h> 32 #include <unistd.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <getopt.h> 36 #include <sys/stat.h> 37 #include <sys/ioctl.h> 38 #include <sys/soundcard.h> 39 40 #include "sbc.h" 41 #include "formats.h" 42 43 #define BUF_SIZE 8192 44 45 static int verbose = 0; 46 47 static void decode(char *filename, char *output, int tofile) 48 { 49 unsigned char buf[BUF_SIZE], *stream; 50 struct stat st; 51 sbc_t sbc; 52 int fd, ad, pos, streamlen, framelen, count; 53 size_t len; 54 int format = AFMT_S16_BE, frequency, channels; 55 ssize_t written; 56 57 if (stat(filename, &st) < 0) { 58 fprintf(stderr, "Can't get size of file %s: %s\n", 59 filename, strerror(errno)); 60 return; 61 } 62 63 stream = malloc(st.st_size); 64 65 if (!stream) { 66 fprintf(stderr, "Can't allocate memory for %s: %s\n", 67 filename, strerror(errno)); 68 return; 69 } 70 71 fd = open(filename, O_RDONLY); 72 if (fd < 0) { 73 fprintf(stderr, "Can't open file %s: %s\n", 74 filename, strerror(errno)); 75 goto free; 76 } 77 78 if (read(fd, stream, st.st_size) != st.st_size) { 79 fprintf(stderr, "Can't read content of %s: %s\n", 80 filename, strerror(errno)); 81 close(fd); 82 goto free; 83 } 84 85 close(fd); 86 87 pos = 0; 88 streamlen = st.st_size; 89 90 if (tofile) 91 ad = open(output, O_WRONLY | O_CREAT | O_TRUNC, 0644); 92 else 93 ad = open(output, O_WRONLY, 0); 94 95 if (ad < 0) { 96 fprintf(stderr, "Can't open output %s: %s\n", 97 output, strerror(errno)); 98 goto free; 99 } 100 101 sbc_init(&sbc, 0L); 102 sbc.endian = SBC_BE; 103 104 framelen = sbc_decode(&sbc, stream, streamlen, buf, sizeof(buf), &len); 105 channels = sbc.mode == SBC_MODE_MONO ? 1 : 2; 106 switch (sbc.frequency) { 107 case SBC_FREQ_16000: 108 frequency = 16000; 109 break; 110 111 case SBC_FREQ_32000: 112 frequency = 32000; 113 break; 114 115 case SBC_FREQ_44100: 116 frequency = 44100; 117 break; 118 119 case SBC_FREQ_48000: 120 frequency = 48000; 121 break; 122 default: 123 frequency = 0; 124 } 125 126 if (verbose) { 127 fprintf(stderr,"decoding %s with rate %d, %d subbands, " 128 "%d bits, allocation method %s and mode %s\n", 129 filename, frequency, sbc.subbands * 4 + 4, sbc.bitpool, 130 sbc.allocation == SBC_AM_SNR ? "SNR" : "LOUDNESS", 131 sbc.mode == SBC_MODE_MONO ? "MONO" : 132 sbc.mode == SBC_MODE_STEREO ? 133 "STEREO" : "JOINTSTEREO"); 134 } 135 136 if (tofile) { 137 struct au_header au_hdr; 138 139 au_hdr.magic = AU_MAGIC; 140 au_hdr.hdr_size = BE_INT(24); 141 au_hdr.data_size = BE_INT(0); 142 au_hdr.encoding = BE_INT(AU_FMT_LIN16); 143 au_hdr.sample_rate = BE_INT(frequency); 144 au_hdr.channels = BE_INT(channels); 145 146 written = write(ad, &au_hdr, sizeof(au_hdr)); 147 if (written < (ssize_t) sizeof(au_hdr)) { 148 fprintf(stderr, "Failed to write header\n"); 149 goto close; 150 } 151 } else { 152 if (ioctl(ad, SNDCTL_DSP_SETFMT, &format) < 0) { 153 fprintf(stderr, "Can't set audio format on %s: %s\n", 154 output, strerror(errno)); 155 goto close; 156 } 157 158 if (ioctl(ad, SNDCTL_DSP_CHANNELS, &channels) < 0) { 159 fprintf(stderr, "Can't set number of channels on %s: %s\n", 160 output, strerror(errno)); 161 goto close; 162 } 163 164 if (ioctl(ad, SNDCTL_DSP_SPEED, &frequency) < 0) { 165 fprintf(stderr, "Can't set audio rate on %s: %s\n", 166 output, strerror(errno)); 167 goto close; 168 } 169 } 170 171 count = len; 172 173 while (framelen > 0) { 174 /* we have completed an sbc_decode at this point sbc.len is the 175 * length of the frame we just decoded count is the number of 176 * decoded bytes yet to be written */ 177 178 if (count + len >= BUF_SIZE) { 179 /* buffer is too full to stuff decoded audio in so it 180 * must be written to the device */ 181 written = write(ad, buf, count); 182 if (written > 0) 183 count -= written; 184 } 185 186 /* sanity check */ 187 if (count + len >= BUF_SIZE) { 188 fprintf(stderr, 189 "buffer size of %d is too small for decoded" 190 " data (%lu)\n", BUF_SIZE, (unsigned long) (len + count)); 191 exit(1); 192 } 193 194 /* push the pointer in the file forward to the next bit to be 195 * decoded tell the decoder to decode up to the remaining 196 * length of the file (!) */ 197 pos += framelen; 198 framelen = sbc_decode(&sbc, stream + pos, streamlen - pos, 199 buf + count, sizeof(buf) - count, &len); 200 201 /* increase the count */ 202 count += len; 203 } 204 205 if (count > 0) { 206 written = write(ad, buf, count); 207 if (written > 0) 208 count -= written; 209 } 210 211 close: 212 sbc_finish(&sbc); 213 214 close(ad); 215 216 free: 217 free(stream); 218 } 219 220 static void usage(void) 221 { 222 printf("SBC decoder utility ver %s\n", VERSION); 223 printf("Copyright (c) 2004-2010 Marcel Holtmann\n\n"); 224 225 printf("Usage:\n" 226 "\tsbcdec [options] file(s)\n" 227 "\n"); 228 229 printf("Options:\n" 230 "\t-h, --help Display help\n" 231 "\t-v, --verbose Verbose mode\n" 232 "\t-d, --device <dsp> Sound device\n" 233 "\t-f, --file <file> Decode to a file\n" 234 "\n"); 235 } 236 237 static struct option main_options[] = { 238 { "help", 0, 0, 'h' }, 239 { "device", 1, 0, 'd' }, 240 { "verbose", 0, 0, 'v' }, 241 { "file", 1, 0, 'f' }, 242 { 0, 0, 0, 0 } 243 }; 244 245 int main(int argc, char *argv[]) 246 { 247 char *output = NULL; 248 int i, opt, tofile = 0; 249 250 while ((opt = getopt_long(argc, argv, "+hvd:f:", 251 main_options, NULL)) != -1) { 252 switch(opt) { 253 case 'h': 254 usage(); 255 exit(0); 256 257 case 'v': 258 verbose = 1; 259 break; 260 261 case 'd': 262 free(output); 263 output = strdup(optarg); 264 tofile = 0; 265 break; 266 267 case 'f' : 268 free(output); 269 output = strdup(optarg); 270 tofile = 1; 271 break; 272 273 default: 274 exit(1); 275 } 276 } 277 278 argc -= optind; 279 argv += optind; 280 optind = 0; 281 282 if (argc < 1) { 283 usage(); 284 exit(1); 285 } 286 287 for (i = 0; i < argc; i++) 288 decode(argv[i], output ? output : "/dev/dsp", tofile); 289 290 free(output); 291 292 return 0; 293 } 294
