| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2007, 2008 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file server/decode.c |
| 19 | * @brief General-purpose decoder for use by speaker process |
| 20 | */ |
| 21 | |
| 22 | #include "disorder-server.h" |
| 23 | |
| 24 | #include <mad.h> |
| 25 | #include <vorbis/vorbisfile.h> |
| 26 | |
| 27 | /* libFLAC has had an API change and stupidly taken away the old API */ |
| 28 | #if HAVE_FLAC_FILE_DECODER_H |
| 29 | # include <FLAC/file_decoder.h> |
| 30 | #else |
| 31 | # include <FLAC/stream_decoder.h> |
| 32 | #define FLAC__FileDecoder FLAC__StreamDecoder |
| 33 | #define FLAC__FileDecoderState FLAC__StreamDecoderState |
| 34 | #endif |
| 35 | |
| 36 | #include "wav.h" |
| 37 | #include "speaker-protocol.h" |
| 38 | |
| 39 | |
| 40 | /** @brief Encoding lookup table type */ |
| 41 | struct decoder { |
| 42 | /** @brief Glob pattern matching file */ |
| 43 | const char *pattern; |
| 44 | /** @brief Decoder function */ |
| 45 | void (*decode)(void); |
| 46 | }; |
| 47 | |
| 48 | /** @brief Input file */ |
| 49 | static int inputfd; |
| 50 | |
| 51 | /** @brief Output file */ |
| 52 | static FILE *outputfp; |
| 53 | |
| 54 | /** @brief Filename */ |
| 55 | static const char *path; |
| 56 | |
| 57 | /** @brief Input buffer */ |
| 58 | static char input_buffer[1048576]; |
| 59 | |
| 60 | /** @brief Number of bytes read into buffer */ |
| 61 | static int input_count; |
| 62 | |
| 63 | /** @brief Write an 8-bit word */ |
| 64 | static inline void output_8(int n) { |
| 65 | if(putc(n, outputfp) < 0) |
| 66 | fatal(errno, "decoding %s: output error", path); |
| 67 | } |
| 68 | |
| 69 | /** @brief Write a 16-bit word in bigendian format */ |
| 70 | static inline void output_16(uint16_t n) { |
| 71 | if(putc(n >> 8, outputfp) < 0 |
| 72 | || putc(n, outputfp) < 0) |
| 73 | fatal(errno, "decoding %s: output error", path); |
| 74 | } |
| 75 | |
| 76 | /** @brief Write a 24-bit word in bigendian format */ |
| 77 | static inline void output_24(uint32_t n) { |
| 78 | if(putc(n >> 16, outputfp) < 0 |
| 79 | || putc(n >> 8, outputfp) < 0 |
| 80 | || putc(n, outputfp) < 0) |
| 81 | fatal(errno, "decoding %s: output error", path); |
| 82 | } |
| 83 | |
| 84 | /** @brief Write a 32-bit word in bigendian format */ |
| 85 | static inline void output_32(uint32_t n) { |
| 86 | if(putc(n >> 24, outputfp) < 0 |
| 87 | || putc(n >> 16, outputfp) < 0 |
| 88 | || putc(n >> 8, outputfp) < 0 |
| 89 | || putc(n, outputfp) < 0) |
| 90 | fatal(errno, "decoding %s: output error", path); |
| 91 | } |
| 92 | |
| 93 | /** @brief Write a block header |
| 94 | * @param rate Sample rate in Hz |
| 95 | * @param channels Channel count (currently only 1 or 2 supported) |
| 96 | * @param bits Bits per sample (must be a multiple of 8, no more than 64) |
| 97 | * @param nbytes Total number of data bytes |
| 98 | * @param endian @ref ENDIAN_BIG or @ref ENDIAN_LITTLE |
| 99 | * |
| 100 | * Checks that the sample format is a supported one (so other calls do not have |
| 101 | * to) and calls fatal() on error. |
| 102 | */ |
| 103 | static void output_header(int rate, |
| 104 | int channels, |
| 105 | int bits, |
| 106 | int nbytes, |
| 107 | int endian) { |
| 108 | struct stream_header header; |
| 109 | |
| 110 | if(bits <= 0 || bits % 8 || bits > 64) |
| 111 | fatal(0, "decoding %s: unsupported sample size %d bits", path, bits); |
| 112 | if(channels <= 0 || channels > 2) |
| 113 | fatal(0, "decoding %s: unsupported channel count %d", path, channels); |
| 114 | if(rate <= 0) |
| 115 | fatal(0, "decoding %s: nonsensical sample rate %dHz", path, rate); |
| 116 | header.rate = rate; |
| 117 | header.bits = bits; |
| 118 | header.channels = channels; |
| 119 | header.endian = endian; |
| 120 | header.nbytes = nbytes; |
| 121 | if(fwrite(&header, sizeof header, 1, outputfp) < 1) |
| 122 | fatal(errno, "decoding %s: writing format header", path); |
| 123 | } |
| 124 | |
| 125 | /** @brief Dithering state |
| 126 | * Filched from mpg321, which credits it to Robert Leslie */ |
| 127 | struct audio_dither { |
| 128 | mad_fixed_t error[3]; |
| 129 | mad_fixed_t random; |
| 130 | }; |
| 131 | |
| 132 | /** @brief 32-bit PRNG |
| 133 | * Filched from mpg321, which credits it to Robert Leslie */ |
| 134 | static inline unsigned long prng(unsigned long state) |
| 135 | { |
| 136 | return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL; |
| 137 | } |
| 138 | |
| 139 | /** @brief Generic linear sample quantize and dither routine |
| 140 | * Filched from mpg321, which credits it to Robert Leslie */ |
| 141 | static long audio_linear_dither(mad_fixed_t sample, |
| 142 | struct audio_dither *dither) { |
| 143 | unsigned int scalebits; |
| 144 | mad_fixed_t output, mask, rnd; |
| 145 | const int bits = 16; |
| 146 | |
| 147 | enum { |
| 148 | MIN = -MAD_F_ONE, |
| 149 | MAX = MAD_F_ONE - 1 |
| 150 | }; |
| 151 | |
| 152 | /* noise shape */ |
| 153 | sample += dither->error[0] - dither->error[1] + dither->error[2]; |
| 154 | |
| 155 | dither->error[2] = dither->error[1]; |
| 156 | dither->error[1] = dither->error[0] / 2; |
| 157 | |
| 158 | /* bias */ |
| 159 | output = sample + (1L << (MAD_F_FRACBITS + 1 - bits - 1)); |
| 160 | |
| 161 | scalebits = MAD_F_FRACBITS + 1 - bits; |
| 162 | mask = (1L << scalebits) - 1; |
| 163 | |
| 164 | /* dither */ |
| 165 | rnd = prng(dither->random); |
| 166 | output += (rnd & mask) - (dither->random & mask); |
| 167 | |
| 168 | dither->random = rnd; |
| 169 | |
| 170 | /* clip */ |
| 171 | if (output > MAX) { |
| 172 | output = MAX; |
| 173 | |
| 174 | if (sample > MAX) |
| 175 | sample = MAX; |
| 176 | } |
| 177 | else if (output < MIN) { |
| 178 | output = MIN; |
| 179 | |
| 180 | if (sample < MIN) |
| 181 | sample = MIN; |
| 182 | } |
| 183 | |
| 184 | /* quantize */ |
| 185 | output &= ~mask; |
| 186 | |
| 187 | /* error feedback */ |
| 188 | dither->error[0] = sample - output; |
| 189 | |
| 190 | /* scale */ |
| 191 | return output >> scalebits; |
| 192 | } |
| 193 | |
| 194 | /** @brief MP3 output callback */ |
| 195 | static enum mad_flow mp3_output(void attribute((unused)) *data, |
| 196 | struct mad_header const *header, |
| 197 | struct mad_pcm *pcm) { |
| 198 | size_t n = pcm->length; |
| 199 | const mad_fixed_t *l = pcm->samples[0], *r = pcm->samples[1]; |
| 200 | static struct audio_dither ld[1], rd[1]; |
| 201 | |
| 202 | output_header(header->samplerate, |
| 203 | pcm->channels, |
| 204 | 16, |
| 205 | 2 * pcm->channels * pcm->length, |
| 206 | ENDIAN_BIG); |
| 207 | switch(pcm->channels) { |
| 208 | case 1: |
| 209 | while(n--) |
| 210 | output_16(audio_linear_dither(*l++, ld)); |
| 211 | break; |
| 212 | case 2: |
| 213 | while(n--) { |
| 214 | output_16(audio_linear_dither(*l++, ld)); |
| 215 | output_16(audio_linear_dither(*r++, rd)); |
| 216 | } |
| 217 | break; |
| 218 | } |
| 219 | return MAD_FLOW_CONTINUE; |
| 220 | } |
| 221 | |
| 222 | /** @brief MP3 input callback */ |
| 223 | static enum mad_flow mp3_input(void attribute((unused)) *data, |
| 224 | struct mad_stream *stream) { |
| 225 | int used, remain, n; |
| 226 | |
| 227 | /* libmad requires its caller to do ALL the buffering work, including coping |
| 228 | * with partial frames. Given that it appears to be completely undocumented |
| 229 | * you could perhaps be forgiven for not discovering this... */ |
| 230 | if(input_count) { |
| 231 | /* Compute total number of bytes consumed */ |
| 232 | used = (char *)stream->next_frame - input_buffer; |
| 233 | /* Compute number of bytes left to consume */ |
| 234 | remain = input_count - used; |
| 235 | memmove(input_buffer, input_buffer + used, remain); |
| 236 | } else { |
| 237 | remain = 0; |
| 238 | } |
| 239 | /* Read new data */ |
| 240 | n = read(inputfd, input_buffer + remain, (sizeof input_buffer) - remain); |
| 241 | if(n < 0) |
| 242 | fatal(errno, "reading from %s", path); |
| 243 | /* Compute total number of bytes available */ |
| 244 | input_count = remain + n; |
| 245 | if(input_count) |
| 246 | mad_stream_buffer(stream, (unsigned char *)input_buffer, input_count); |
| 247 | if(n) |
| 248 | return MAD_FLOW_CONTINUE; |
| 249 | else |
| 250 | return MAD_FLOW_STOP; |
| 251 | } |
| 252 | |
| 253 | /** @brief MP3 error callback */ |
| 254 | static enum mad_flow mp3_error(void attribute((unused)) *data, |
| 255 | struct mad_stream *stream, |
| 256 | struct mad_frame attribute((unused)) *frame) { |
| 257 | if(0) |
| 258 | /* Just generates pointless verbosity l-( */ |
| 259 | error(0, "decoding %s: %s (%#04x)", |
| 260 | path, mad_stream_errorstr(stream), stream->error); |
| 261 | return MAD_FLOW_CONTINUE; |
| 262 | } |
| 263 | |
| 264 | /** @brief MP3 decoder */ |
| 265 | static void decode_mp3(void) { |
| 266 | struct mad_decoder mad[1]; |
| 267 | |
| 268 | if((inputfd = open(path, O_RDONLY)) < 0) |
| 269 | fatal(errno, "opening %s", path); |
| 270 | mad_decoder_init(mad, 0/*data*/, mp3_input, 0/*header*/, 0/*filter*/, |
| 271 | mp3_output, mp3_error, 0/*message*/); |
| 272 | if(mad_decoder_run(mad, MAD_DECODER_MODE_SYNC)) |
| 273 | exit(1); |
| 274 | mad_decoder_finish(mad); |
| 275 | } |
| 276 | |
| 277 | /** @brief OGG decoder */ |
| 278 | static void decode_ogg(void) { |
| 279 | FILE *fp; |
| 280 | OggVorbis_File vf[1]; |
| 281 | int err; |
| 282 | long n; |
| 283 | int bitstream; |
| 284 | vorbis_info *vi; |
| 285 | |
| 286 | if(!(fp = fopen(path, "rb"))) |
| 287 | fatal(errno, "cannot open %s", path); |
| 288 | /* There doesn't seem to be any standard function for mapping the error codes |
| 289 | * to strings l-( */ |
| 290 | if((err = ov_open(fp, vf, 0/*initial*/, 0/*ibytes*/))) |
| 291 | fatal(0, "ov_fopen %s: %d", path, err); |
| 292 | if(!(vi = ov_info(vf, 0/*link*/))) |
| 293 | fatal(0, "ov_info %s: failed", path); |
| 294 | while((n = ov_read(vf, input_buffer, sizeof input_buffer, 1/*bigendianp*/, |
| 295 | 2/*bytes/word*/, 1/*signed*/, &bitstream))) { |
| 296 | if(n < 0) |
| 297 | fatal(0, "ov_read %s: %ld", path, n); |
| 298 | if(bitstream > 0) |
| 299 | fatal(0, "only single-bitstream ogg files are supported"); |
| 300 | output_header(vi->rate, vi->channels, 16/*bits*/, n, ENDIAN_BIG); |
| 301 | if(fwrite(input_buffer, 1, n, outputfp) < (size_t)n) |
| 302 | fatal(errno, "decoding %s: writing sample data", path); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | /** @brief Sample data callback used by decode_wav() */ |
| 307 | static int wav_write(struct wavfile attribute((unused)) *f, |
| 308 | const char *data, |
| 309 | size_t nbytes, |
| 310 | void attribute((unused)) *u) { |
| 311 | if(fwrite(data, 1, nbytes, outputfp) < nbytes) |
| 312 | fatal(errno, "decoding %s: writing sample data", path); |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | /** @brief WAV file decoder */ |
| 317 | static void decode_wav(void) { |
| 318 | struct wavfile f[1]; |
| 319 | int err; |
| 320 | |
| 321 | if((err = wav_init(f, path))) |
| 322 | fatal(err, "opening %s", path); |
| 323 | output_header(f->rate, f->channels, f->bits, f->datasize, ENDIAN_LITTLE); |
| 324 | if((err = wav_data(f, wav_write, 0))) |
| 325 | fatal(err, "error decoding %s", path); |
| 326 | } |
| 327 | |
| 328 | /** @brief Metadata callback for FLAC decoder |
| 329 | * |
| 330 | * This is a no-op here. |
| 331 | */ |
| 332 | static void flac_metadata(const FLAC__FileDecoder attribute((unused)) *decoder, |
| 333 | const FLAC__StreamMetadata attribute((unused)) *metadata, |
| 334 | void attribute((unused)) *client_data) { |
| 335 | } |
| 336 | |
| 337 | /** @brief Error callback for FLAC decoder */ |
| 338 | static void flac_error(const FLAC__FileDecoder attribute((unused)) *decoder, |
| 339 | FLAC__StreamDecoderErrorStatus status, |
| 340 | void attribute((unused)) *client_data) { |
| 341 | fatal(0, "error decoding %s: %s", path, |
| 342 | FLAC__StreamDecoderErrorStatusString[status]); |
| 343 | } |
| 344 | |
| 345 | /** @brief Write callback for FLAC decoder */ |
| 346 | static FLAC__StreamDecoderWriteStatus flac_write |
| 347 | (const FLAC__FileDecoder attribute((unused)) *decoder, |
| 348 | const FLAC__Frame *frame, |
| 349 | const FLAC__int32 *const buffer[], |
| 350 | void attribute((unused)) *client_data) { |
| 351 | size_t n, c; |
| 352 | |
| 353 | output_header(frame->header.sample_rate, |
| 354 | frame->header.channels, |
| 355 | frame->header.bits_per_sample, |
| 356 | (frame->header.channels * frame->header.blocksize |
| 357 | * frame->header.bits_per_sample) / 8, |
| 358 | ENDIAN_BIG); |
| 359 | for(n = 0; n < frame->header.blocksize; ++n) { |
| 360 | for(c = 0; c < frame->header.channels; ++c) { |
| 361 | switch(frame->header.bits_per_sample) { |
| 362 | case 8: output_8(buffer[c][n]); break; |
| 363 | case 16: output_16(buffer[c][n]); break; |
| 364 | case 24: output_24(buffer[c][n]); break; |
| 365 | case 32: output_32(buffer[c][n]); break; |
| 366 | } |
| 367 | } |
| 368 | } |
| 369 | return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; |
| 370 | } |
| 371 | |
| 372 | |
| 373 | /** @brief FLAC file decoder */ |
| 374 | static void decode_flac(void) { |
| 375 | #if HAVE_FLAC_FILE_DECODER_H |
| 376 | FLAC__FileDecoder *fd = 0; |
| 377 | FLAC__FileDecoderState fs; |
| 378 | |
| 379 | if(!(fd = FLAC__file_decoder_new())) |
| 380 | fatal(0, "FLAC__file_decoder_new failed"); |
| 381 | if(!(FLAC__file_decoder_set_filename(fd, path))) |
| 382 | fatal(0, "FLAC__file_set_filename failed"); |
| 383 | FLAC__file_decoder_set_metadata_callback(fd, flac_metadata); |
| 384 | FLAC__file_decoder_set_error_callback(fd, flac_error); |
| 385 | FLAC__file_decoder_set_write_callback(fd, flac_write); |
| 386 | if((fs = FLAC__file_decoder_init(fd))) |
| 387 | fatal(0, "FLAC__file_decoder_init: %s", FLAC__FileDecoderStateString[fs]); |
| 388 | FLAC__file_decoder_process_until_end_of_file(fd); |
| 389 | #else |
| 390 | FLAC__StreamDecoder *sd = 0; |
| 391 | FLAC__StreamDecoderInitStatus is; |
| 392 | |
| 393 | if((is = FLAC__stream_decoder_init_file(sd, path, flac_write, flac_metadata, |
| 394 | flac_error, 0))) |
| 395 | fatal(0, "FLAC__stream_decoder_init_file %s: %s", |
| 396 | path, FLAC__StreamDecoderInitStatusString[is]); |
| 397 | #endif |
| 398 | } |
| 399 | |
| 400 | /** @brief Lookup table of decoders */ |
| 401 | static const struct decoder decoders[] = { |
| 402 | { "*.mp3", decode_mp3 }, |
| 403 | { "*.MP3", decode_mp3 }, |
| 404 | { "*.ogg", decode_ogg }, |
| 405 | { "*.OGG", decode_ogg }, |
| 406 | { "*.flac", decode_flac }, |
| 407 | { "*.FLAC", decode_flac }, |
| 408 | { "*.wav", decode_wav }, |
| 409 | { "*.WAV", decode_wav }, |
| 410 | { 0, 0 } |
| 411 | }; |
| 412 | |
| 413 | static const struct option options[] = { |
| 414 | { "help", no_argument, 0, 'h' }, |
| 415 | { "version", no_argument, 0, 'V' }, |
| 416 | { 0, 0, 0, 0 } |
| 417 | }; |
| 418 | |
| 419 | /* Display usage message and terminate. */ |
| 420 | static void help(void) { |
| 421 | xprintf("Usage:\n" |
| 422 | " disorder-decode [OPTIONS] PATH\n" |
| 423 | "Options:\n" |
| 424 | " --help, -h Display usage message\n" |
| 425 | " --version, -V Display version number\n" |
| 426 | "\n" |
| 427 | "Audio decoder for DisOrder. Only intended to be used by speaker\n" |
| 428 | "process, not for normal users.\n"); |
| 429 | xfclose(stdout); |
| 430 | exit(0); |
| 431 | } |
| 432 | |
| 433 | int main(int argc, char **argv) { |
| 434 | int n; |
| 435 | const char *e; |
| 436 | |
| 437 | set_progname(argv); |
| 438 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "calling setlocale"); |
| 439 | while((n = getopt_long(argc, argv, "hV", options, 0)) >= 0) { |
| 440 | switch(n) { |
| 441 | case 'h': help(); |
| 442 | case 'V': version("disorder-decode"); |
| 443 | default: fatal(0, "invalid option"); |
| 444 | } |
| 445 | } |
| 446 | if(optind >= argc) |
| 447 | fatal(0, "missing filename"); |
| 448 | if(optind + 1 < argc) |
| 449 | fatal(0, "excess arguments"); |
| 450 | if((e = getenv("DISORDER_RAW_FD"))) { |
| 451 | if(!(outputfp = fdopen(atoi(e), "wb"))) |
| 452 | fatal(errno, "fdopen"); |
| 453 | } else |
| 454 | outputfp = stdout; |
| 455 | path = argv[optind]; |
| 456 | for(n = 0; |
| 457 | decoders[n].pattern |
| 458 | && fnmatch(decoders[n].pattern, path, 0) != 0; |
| 459 | ++n) |
| 460 | ; |
| 461 | if(!decoders[n].pattern) |
| 462 | fatal(0, "cannot determine file type for %s", path); |
| 463 | decoders[n].decode(); |
| 464 | xfclose(outputfp); |
| 465 | return 0; |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | Local Variables: |
| 470 | c-basic-offset:2 |
| 471 | comment-column:40 |
| 472 | fill-column:79 |
| 473 | indent-tabs-mode:nil |
| 474 | End: |
| 475 | */ |