record.c revision 1.39
1 /* $NetBSD: record.c,v 1.39 2005/07/05 21:05:50 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1999, 2002 Matthew R. Green 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * SunOS compatible audiorecord(1) 33 */ 34 #include <sys/cdefs.h> 35 36 #ifndef lint 37 __RCSID("$NetBSD: record.c,v 1.39 2005/07/05 21:05:50 mrg Exp $"); 38 #endif 39 40 41 #include <sys/types.h> 42 #include <sys/audioio.h> 43 #include <sys/ioctl.h> 44 #include <sys/time.h> 45 #include <sys/uio.h> 46 47 #include <err.h> 48 #include <fcntl.h> 49 #include <paths.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include "libaudio.h" 57 #include "auconv.h" 58 59 audio_info_t info, oinfo; 60 ssize_t total_size = -1; 61 const char *device; 62 int format = AUDIO_FORMAT_DEFAULT; 63 char *header_info; 64 char default_info[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' }; 65 int audiofd, outfd; 66 int qflag, aflag, fflag; 67 int verbose; 68 int monitor_gain, omonitor_gain; 69 int gain; 70 int balance; 71 int port; 72 int encoding; 73 char *encoding_str; 74 int precision; 75 int sample_rate; 76 int channels; 77 struct timeval record_time; 78 struct timeval start_time; 79 80 void (*conv_func) (u_char *, int); 81 82 void usage (void); 83 int main (int, char *[]); 84 int timeleft (struct timeval *, struct timeval *); 85 void cleanup (int) __attribute__((__noreturn__)); 86 int write_header_sun (void **, size_t *, int *); 87 int write_header_wav (void **, size_t *, int *); 88 void write_header (void); 89 void rewrite_header (void); 90 91 int 92 main(argc, argv) 93 int argc; 94 char *argv[]; 95 { 96 char *buffer; 97 size_t len, bufsize; 98 int ch, no_time_limit = 1; 99 const char *defdevice = _PATH_SOUND; 100 101 while ((ch = getopt(argc, argv, "ab:C:F:c:d:e:fhi:m:P:p:qt:s:Vv:")) != -1) { 102 switch (ch) { 103 case 'a': 104 aflag++; 105 break; 106 case 'b': 107 decode_int(optarg, &balance); 108 if (balance < 0 || balance > 63) 109 errx(1, "balance must be between 0 and 63"); 110 break; 111 case 'C': 112 /* Ignore, compatibility */ 113 break; 114 case 'F': 115 format = audio_format_from_str(optarg); 116 if (format < 0) 117 errx(1, "Unknown audio format; supported " 118 "formats: \"sun\", \"wav\", and \"none\""); 119 break; 120 case 'c': 121 decode_int(optarg, &channels); 122 if (channels < 0 || channels > 16) 123 errx(1, "channels must be between 0 and 16"); 124 break; 125 case 'd': 126 device = optarg; 127 break; 128 case 'e': 129 encoding_str = optarg; 130 break; 131 case 'f': 132 fflag++; 133 break; 134 case 'i': 135 header_info = optarg; 136 break; 137 case 'm': 138 decode_int(optarg, &monitor_gain); 139 if (monitor_gain < 0 || monitor_gain > 255) 140 errx(1, "monitor volume must be between 0 and 255"); 141 break; 142 case 'P': 143 decode_int(optarg, &precision); 144 if (precision != 4 && precision != 8 && 145 precision != 16 && precision != 24 && 146 precision != 32) 147 errx(1, "precision must be between 4, 8, 16, 24 or 32"); 148 break; 149 case 'p': 150 len = strlen(optarg); 151 152 if (strncmp(optarg, "mic", len) == 0) 153 port |= AUDIO_MICROPHONE; 154 else if (strncmp(optarg, "cd", len) == 0 || 155 strncmp(optarg, "internal-cd", len) == 0) 156 port |= AUDIO_CD; 157 else if (strncmp(optarg, "line", len) == 0) 158 port |= AUDIO_LINE_IN; 159 else 160 errx(1, 161 "port must be `cd', `internal-cd', `mic', or `line'"); 162 break; 163 case 'q': 164 qflag++; 165 break; 166 case 's': 167 decode_int(optarg, &sample_rate); 168 if (sample_rate < 0 || sample_rate > 48000 * 2) /* XXX */ 169 errx(1, "sample rate must be between 0 and 96000"); 170 break; 171 case 't': 172 no_time_limit = 0; 173 decode_time(optarg, &record_time); 174 break; 175 case 'V': 176 verbose++; 177 break; 178 case 'v': 179 decode_int(optarg, &gain); 180 if (gain < 0 || gain > 255) 181 errx(1, "volume must be between 0 and 255"); 182 break; 183 /* case 'h': */ 184 default: 185 usage(); 186 /* NOTREACHED */ 187 } 188 } 189 argc -= optind; 190 argv += optind; 191 192 if (argc != 1) 193 usage(); 194 195 /* 196 * open the audio device 197 */ 198 if (device == NULL && (device = getenv("AUDIODEVICE")) == NULL && 199 (device = getenv("AUDIODEV")) == NULL) /* Sun compatibility */ 200 device = defdevice; 201 202 audiofd = open(device, O_RDONLY); 203 if (audiofd < 0 && device == defdevice) { 204 device = _PATH_SOUND0; 205 audiofd = open(device, O_RDONLY); 206 } 207 if (audiofd < 0) 208 err(1, "failed to open %s", device); 209 210 /* 211 * work out the buffer size to use, and allocate it. also work out 212 * what the old monitor gain value is, so that we can reset it later. 213 */ 214 if (ioctl(audiofd, AUDIO_GETINFO, &oinfo) < 0) 215 err(1, "failed to get audio info"); 216 bufsize = oinfo.record.buffer_size; 217 if (bufsize < 32 * 1024) 218 bufsize = 32 * 1024; 219 omonitor_gain = oinfo.monitor_gain; 220 221 buffer = malloc(bufsize); 222 if (buffer == NULL) 223 err(1, "couldn't malloc buffer of %d size", (int)bufsize); 224 225 /* 226 * open the output file 227 */ 228 if (argv[0][0] != '-' && argv[0][1] != '\0') { 229 /* intuit the file type from the name */ 230 if (format == AUDIO_FORMAT_DEFAULT) 231 { 232 size_t flen = strlen(*argv); 233 const char *arg = *argv; 234 235 if (strcasecmp(arg + flen - 3, ".au") == 0) 236 format = AUDIO_FORMAT_SUN; 237 else if (strcasecmp(arg + flen - 4, ".wav") == 0) 238 format = AUDIO_FORMAT_WAV; 239 } 240 outfd = open(*argv, O_CREAT|(aflag ? O_APPEND : O_TRUNC)|O_WRONLY, 0666); 241 if (outfd < 0) 242 err(1, "could not open %s", *argv); 243 } else 244 outfd = STDOUT_FILENO; 245 246 /* 247 * convert the encoding string into a value. 248 */ 249 if (encoding_str) { 250 encoding = audio_enc_to_val(encoding_str); 251 if (encoding == -1) 252 errx(1, "unknown encoding, bailing..."); 253 } 254 else 255 encoding = AUDIO_ENCODING_ULAW; 256 257 /* 258 * set up audio device for recording with the speified parameters 259 */ 260 AUDIO_INITINFO(&info); 261 262 /* 263 * for these, get the current values for stuffing into the header 264 */ 265 #define SETINFO(x) if (x) info.record.x = x; else x = oinfo.record.x 266 SETINFO (sample_rate); 267 SETINFO (channels); 268 SETINFO (precision); 269 SETINFO (encoding); 270 SETINFO (gain); 271 SETINFO (port); 272 SETINFO (balance); 273 #undef SETINFO 274 275 if (monitor_gain) 276 info.monitor_gain = monitor_gain; 277 else 278 monitor_gain = oinfo.monitor_gain; 279 280 info.mode = AUMODE_RECORD; 281 if (ioctl(audiofd, AUDIO_SETINFO, &info) < 0) 282 err(1, "failed to set audio info"); 283 284 signal(SIGINT, cleanup); 285 write_header(); 286 total_size = 0; 287 288 if (verbose && conv_func) { 289 const char *s = NULL; 290 291 if (conv_func == swap_bytes) 292 s = "swap bytes (16 bit)"; 293 else if (conv_func == swap_bytes32) 294 s = "swap bytes (32 bit)"; 295 else if (conv_func == change_sign16_be) 296 s = "change sign (big-endian, 16 bit)"; 297 else if (conv_func == change_sign16_le) 298 s = "change sign (little-endian, 16 bit)"; 299 else if (conv_func == change_sign32_be) 300 s = "change sign (big-endian, 32 bit)"; 301 else if (conv_func == change_sign32_le) 302 s = "change sign (little-endian, 32 bit)"; 303 else if (conv_func == change_sign16_swap_bytes_be) 304 s = "change sign & swap bytes (big-endian, 16 bit)"; 305 else if (conv_func == change_sign16_swap_bytes_le) 306 s = "change sign & swap bytes (little-endian, 16 bit)"; 307 else if (conv_func == change_sign32_swap_bytes_be) 308 s = "change sign (big-endian, 32 bit)"; 309 else if (conv_func == change_sign32_swap_bytes_le) 310 s = "change sign & swap bytes (little-endian, 32 bit)"; 311 312 if (s) 313 fprintf(stderr, "%s: converting, using function: %s\n", 314 getprogname(), s); 315 else 316 fprintf(stderr, "%s: using unnamed conversion " 317 "function\n", getprogname()); 318 } 319 320 if (verbose) 321 fprintf(stderr, 322 "sample_rate=%d channels=%d precision=%d encoding=%s\n", 323 info.record.sample_rate, info.record.channels, 324 info.record.precision, 325 audio_enc_from_val(info.record.encoding)); 326 327 if (!no_time_limit && verbose) 328 fprintf(stderr, "recording for %lu seconds, %lu microseconds\n", 329 (u_long)record_time.tv_sec, (u_long)record_time.tv_usec); 330 331 (void)gettimeofday(&start_time, NULL); 332 while (no_time_limit || timeleft(&start_time, &record_time)) { 333 if (read(audiofd, buffer, bufsize) != bufsize) 334 err(1, "read failed"); 335 if (conv_func) 336 (*conv_func)(buffer, bufsize); 337 if (write(outfd, buffer, bufsize) != bufsize) 338 err(1, "write failed"); 339 total_size += bufsize; 340 } 341 cleanup(0); 342 } 343 344 int 345 timeleft(start_tvp, record_tvp) 346 struct timeval *start_tvp; 347 struct timeval *record_tvp; 348 { 349 struct timeval now, diff; 350 351 (void)gettimeofday(&now, NULL); 352 timersub(&now, start_tvp, &diff); 353 timersub(record_tvp, &diff, &now); 354 355 return (now.tv_sec > 0 || (now.tv_sec == 0 && now.tv_usec > 0)); 356 } 357 358 void 359 cleanup(signo) 360 int signo; 361 { 362 363 rewrite_header(); 364 close(outfd); 365 if (omonitor_gain) { 366 AUDIO_INITINFO(&info); 367 info.monitor_gain = omonitor_gain; 368 if (ioctl(audiofd, AUDIO_SETINFO, &info) < 0) 369 err(1, "failed to reset audio info"); 370 } 371 close(audiofd); 372 exit(0); 373 } 374 375 int 376 write_header_sun(hdrp, lenp, leftp) 377 void **hdrp; 378 size_t *lenp; 379 int *leftp; 380 { 381 static int warned = 0; 382 static sun_audioheader auh; 383 int sunenc, oencoding = encoding; 384 385 /* only perform conversions if we don't specify the encoding */ 386 switch (encoding) { 387 case AUDIO_ENCODING_ULINEAR_LE: 388 #if BYTE_ORDER == LITTLE_ENDIAN 389 case AUDIO_ENCODING_ULINEAR: 390 #endif 391 if (precision == 16) 392 conv_func = change_sign16_swap_bytes_le; 393 else if (precision == 32) 394 conv_func = change_sign32_swap_bytes_le; 395 if (conv_func) 396 encoding = AUDIO_ENCODING_SLINEAR_BE; 397 break; 398 399 case AUDIO_ENCODING_ULINEAR_BE: 400 #if BYTE_ORDER == BIG_ENDIAN 401 case AUDIO_ENCODING_ULINEAR: 402 #endif 403 if (precision == 16) 404 conv_func = change_sign16_be; 405 else if (precision == 32) 406 conv_func = change_sign32_be; 407 if (conv_func) 408 encoding = AUDIO_ENCODING_SLINEAR_BE; 409 break; 410 411 case AUDIO_ENCODING_SLINEAR_LE: 412 #if BYTE_ORDER == LITTLE_ENDIAN 413 case AUDIO_ENCODING_SLINEAR: 414 #endif 415 if (precision == 16) 416 conv_func = swap_bytes; 417 else if (precision == 32) 418 conv_func = swap_bytes32; 419 if (conv_func) 420 encoding = AUDIO_ENCODING_SLINEAR_BE; 421 break; 422 423 #if BYTE_ORDER == BIG_ENDIAN 424 case AUDIO_ENCODING_SLINEAR: 425 encoding = AUDIO_ENCODING_SLINEAR_BE; 426 break; 427 #endif 428 } 429 430 /* if we can't express this as a Sun header, don't write any */ 431 if (audio_encoding_to_sun(encoding, precision, &sunenc) != 0) { 432 if (!qflag && !warned) { 433 const char *s = audio_enc_from_val(oencoding); 434 435 if (s == NULL) 436 s = "(unknown)"; 437 warnx("failed to convert to sun encoding from %s " 438 "(precision %d);\nSun audio header not written", 439 s, precision); 440 } 441 format = AUDIO_FORMAT_NONE; 442 conv_func = 0; 443 warned = 1; 444 return -1; 445 } 446 447 auh.magic = htonl(AUDIO_FILE_MAGIC); 448 if (outfd == STDOUT_FILENO) 449 auh.data_size = htonl(AUDIO_UNKNOWN_SIZE); 450 else 451 auh.data_size = htonl(total_size); 452 auh.encoding = htonl(sunenc); 453 auh.sample_rate = htonl(sample_rate); 454 auh.channels = htonl(channels); 455 if (header_info) { 456 int len, infolen; 457 458 infolen = ((len = strlen(header_info)) + 7) & 0xfffffff8; 459 *leftp = infolen - len; 460 auh.hdr_size = htonl(sizeof(auh) + infolen); 461 } else { 462 *leftp = sizeof(default_info); 463 auh.hdr_size = htonl(sizeof(auh) + *leftp); 464 } 465 *(sun_audioheader **)hdrp = &auh; 466 *lenp = sizeof auh; 467 return 0; 468 } 469 470 int 471 write_header_wav(hdrp, lenp, leftp) 472 void **hdrp; 473 size_t *lenp; 474 int *leftp; 475 { 476 /* 477 * WAV header we write looks like this: 478 * 479 * bytes purpose 480 * 0-3 "RIFF" 481 * 4-7 file length (minus 8) 482 * 8-15 "WAVEfmt " 483 * 16-19 format size 484 * 20-21 format tag 485 * 22-23 number of channels 486 * 24-27 sample rate 487 * 28-31 average bytes per second 488 * 32-33 block alignment 489 * 34-35 bits per sample 490 * 491 * then for ULAW and ALAW outputs, we have an extended chunk size 492 * and a WAV "fact" to add: 493 * 494 * 36-37 length of extension (== 0) 495 * 38-41 "fact" 496 * 42-45 fact size 497 * 46-49 number of samples written 498 * 50-53 "data" 499 * 54-57 data length 500 * 58- raw audio data 501 * 502 * for PCM outputs we have just the data remaining: 503 * 504 * 36-39 "data" 505 * 40-43 data length 506 * 44- raw audio data 507 * 508 * RIFF\^@^C^@WAVEfmt ^P^@^@^@^A^@^B^@D<AC>^@^@^P<B1>^B^@^D^@^P^@data^@^@^C^@^@^@^@^@^@^@^@^@^@ 509 */ 510 char wavheaderbuf[64], *p = wavheaderbuf; 511 const char *riff = "RIFF", 512 *wavefmt = "WAVEfmt ", 513 *fact = "fact", 514 *data = "data"; 515 u_int32_t filelen, fmtsz, sps, abps, factsz = 4, nsample, datalen; 516 u_int16_t fmttag, nchan, align, bps, extln = 0; 517 518 if (header_info) 519 warnx("header information not supported for WAV"); 520 *leftp = 0; 521 522 switch (precision) { 523 case 8: 524 bps = 8; 525 break; 526 case 16: 527 bps = 16; 528 break; 529 case 32: 530 bps = 32; 531 break; 532 default: 533 { 534 static int warned = 0; 535 536 if (warned == 0) { 537 warnx("can not support precision of %d", precision); 538 warned = 1; 539 } 540 } 541 return (-1); 542 } 543 544 switch (encoding) { 545 case AUDIO_ENCODING_ULAW: 546 fmttag = WAVE_FORMAT_MULAW; 547 fmtsz = 18; 548 align = channels; 549 break; 550 551 case AUDIO_ENCODING_ALAW: 552 fmttag = WAVE_FORMAT_ALAW; 553 fmtsz = 18; 554 align = channels; 555 break; 556 557 /* 558 * we could try to support RIFX but it seems to be more portable 559 * to output little-endian data for WAV files. 560 */ 561 case AUDIO_ENCODING_ULINEAR_BE: 562 #if BYTE_ORDER == BIG_ENDIAN 563 case AUDIO_ENCODING_ULINEAR: 564 #endif 565 if (bps == 16) 566 conv_func = change_sign16_swap_bytes_be; 567 else if (bps == 32) 568 conv_func = change_sign32_swap_bytes_be; 569 goto fmt_pcm; 570 571 case AUDIO_ENCODING_SLINEAR_BE: 572 #if BYTE_ORDER == BIG_ENDIAN 573 case AUDIO_ENCODING_SLINEAR: 574 #endif 575 if (bps == 8) 576 conv_func = change_sign8; 577 else if (bps == 16) 578 conv_func = swap_bytes; 579 else if (bps == 32) 580 conv_func = swap_bytes32; 581 goto fmt_pcm; 582 583 case AUDIO_ENCODING_ULINEAR_LE: 584 #if BYTE_ORDER == LITTLE_ENDIAN 585 case AUDIO_ENCODING_ULINEAR: 586 #endif 587 if (bps == 16) 588 conv_func = change_sign16_le; 589 else if (bps == 32) 590 conv_func = change_sign32_le; 591 /* FALLTHROUGH */ 592 593 case AUDIO_ENCODING_SLINEAR_LE: 594 case AUDIO_ENCODING_PCM16: 595 #if BYTE_ORDER == LITTLE_ENDIAN 596 case AUDIO_ENCODING_SLINEAR: 597 #endif 598 if (bps == 8) 599 conv_func = change_sign8; 600 fmt_pcm: 601 fmttag = WAVE_FORMAT_PCM; 602 fmtsz = 16; 603 align = channels * (bps / 8); 604 break; 605 606 default: 607 { 608 static int warned = 0; 609 610 if (warned == 0) { 611 const char *s = wav_enc_from_val(encoding); 612 613 if (s == NULL) 614 warnx("can not support encoding of %s", s); 615 else 616 warnx("can not support encoding of %d", encoding); 617 warned = 1; 618 } 619 } 620 format = AUDIO_FORMAT_NONE; 621 return (-1); 622 } 623 624 nchan = channels; 625 sps = sample_rate; 626 627 /* data length */ 628 if (outfd == STDOUT_FILENO) 629 datalen = 0; 630 else 631 datalen = total_size; 632 633 /* file length */ 634 filelen = 4 + (8 + fmtsz) + (8 + datalen); 635 if (fmttag != WAVE_FORMAT_PCM) 636 filelen += 8 + factsz; 637 638 abps = (double)align*sample_rate / (double)1 + 0.5; 639 640 nsample = (datalen / bps) / sample_rate; 641 642 /* 643 * now we've calculated the info, write it out! 644 */ 645 #define put32(x) do { \ 646 u_int32_t _f; \ 647 putle32(_f, (x)); \ 648 memcpy(p, &_f, 4); \ 649 } while (0) 650 #define put16(x) do { \ 651 u_int16_t _f; \ 652 putle16(_f, (x)); \ 653 memcpy(p, &_f, 2); \ 654 } while (0) 655 memcpy(p, riff, 4); 656 p += 4; /* 4 */ 657 put32(filelen); 658 p += 4; /* 8 */ 659 memcpy(p, wavefmt, 8); 660 p += 8; /* 16 */ 661 put32(fmtsz); 662 p += 4; /* 20 */ 663 put16(fmttag); 664 p += 2; /* 22 */ 665 put16(nchan); 666 p += 2; /* 24 */ 667 put32(sps); 668 p += 4; /* 28 */ 669 put32(abps); 670 p += 4; /* 32 */ 671 put16(align); 672 p += 2; /* 34 */ 673 put16(bps); 674 p += 2; /* 36 */ 675 /* NON PCM formats have an extended chunk; write it */ 676 if (fmttag != WAVE_FORMAT_PCM) { 677 put16(extln); 678 p += 2; /* 38 */ 679 memcpy(p, fact, 4); 680 p += 4; /* 42 */ 681 put32(factsz); 682 p += 4; /* 46 */ 683 put32(nsample); 684 p += 4; /* 50 */ 685 } 686 memcpy(p, data, 4); 687 p += 4; /* 40/54 */ 688 put32(datalen); 689 p += 4; /* 44/58 */ 690 #undef put32 691 #undef put16 692 693 *hdrp = wavheaderbuf; 694 *lenp = (p - wavheaderbuf); 695 696 return 0; 697 } 698 699 void 700 write_header() 701 { 702 struct iovec iv[3]; 703 int veclen, left, tlen; 704 void *hdr; 705 size_t hdrlen; 706 707 switch (format) { 708 case AUDIO_FORMAT_DEFAULT: 709 case AUDIO_FORMAT_SUN: 710 if (write_header_sun(&hdr, &hdrlen, &left) != 0) 711 return; 712 break; 713 case AUDIO_FORMAT_WAV: 714 if (write_header_wav(&hdr, &hdrlen, &left) != 0) 715 return; 716 break; 717 case AUDIO_FORMAT_NONE: 718 return; 719 default: 720 errx(1, "unknown audio format"); 721 } 722 723 veclen = 0; 724 tlen = 0; 725 726 if (hdrlen != 0) { 727 iv[veclen].iov_base = hdr; 728 iv[veclen].iov_len = hdrlen; 729 tlen += iv[veclen++].iov_len; 730 } 731 if (header_info) { 732 iv[veclen].iov_base = header_info; 733 iv[veclen].iov_len = (int)strlen(header_info) + 1; 734 tlen += iv[veclen++].iov_len; 735 } 736 if (left) { 737 iv[veclen].iov_base = default_info; 738 iv[veclen].iov_len = left; 739 tlen += iv[veclen++].iov_len; 740 } 741 742 if (tlen == 0) 743 return; 744 745 if (writev(outfd, iv, veclen) != tlen) 746 err(1, "could not write audio header"); 747 } 748 749 void 750 rewrite_header() 751 { 752 753 /* can't do this here! */ 754 if (outfd == STDOUT_FILENO) 755 return; 756 757 if (lseek(outfd, SEEK_SET, 0) < 0) 758 err(1, "could not seek to start of file for header rewrite"); 759 write_header(); 760 } 761 762 void 763 usage() 764 { 765 766 fprintf(stderr, "Usage: %s [-afhqV] [options] {files ...|-}\n", 767 getprogname()); 768 fprintf(stderr, "Options:\n\t" 769 "-b balance (0-63)\n\t" 770 "-c channels\n\t" 771 "-d audio device\n\t" 772 "-e encoding\n\t" 773 "-F format\n\t" 774 "-i header information\n\t" 775 "-m monitor volume\n\t" 776 "-P precision (4, 8, 16, 24, or 32 bits)\n\t" 777 "-p input port\n\t" 778 "-s sample rate\n\t" 779 "-t recording time\n\t" 780 "-v volume\n"); 781 exit(EXIT_FAILURE); 782 } 783
Indexes created Fri Oct 03 02:09:57 GMT 2025