1 /* $OpenBSD: sio.c,v 1.21 2016/01/09 08:27:24 ratchov Exp $ */ 2 /* 3 * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/types.h> 19 #include <sys/stat.h> 20 21 #include <errno.h> 22 #include <fcntl.h> 23 #include <poll.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <time.h> 28 #include <unistd.h> 29 30 #include "debug.h" 31 #include "sio_priv.h" 32 33 #define SIO_PAR_MAGIC 0x83b905a4 34 35 void 36 sio_initpar(struct sio_par *par) 37 { 38 memset(par, 0xff, sizeof(struct sio_par)); 39 par->__magic = SIO_PAR_MAGIC; 40 } 41 42 struct sio_hdl * 43 sio_open(const char *str, unsigned int mode, int nbio) 44 { 45 static char devany[] = SIO_DEVANY; 46 struct sio_hdl *hdl; 47 48 #ifdef DEBUG 49 _sndio_debug_init(); 50 #endif 51 if ((mode & (SIO_PLAY | SIO_REC)) == 0) 52 return NULL; 53 if (str == NULL) /* backward compat */ 54 str = devany; 55 if (strcmp(str, devany) == 0 && !issetugid()) { 56 str = getenv("AUDIODEVICE"); 57 if (str == NULL) 58 str = devany; 59 } 60 if (strcmp(str, devany) == 0) { 61 hdl = _sio_aucat_open("snd/0", mode, nbio); 62 if (hdl != NULL) 63 return hdl; 64 return _sio_sun_open("rsnd/0", mode, nbio); 65 } 66 if (_sndio_parsetype(str, "snd")) 67 return _sio_aucat_open(str, mode, nbio); 68 if (_sndio_parsetype(str, "rsnd")) 69 return _sio_sun_open(str, mode, nbio); 70 DPRINTF("sio_open: %s: unknown device type\n", str); 71 return NULL; 72 } 73 74 void 75 _sio_create(struct sio_hdl *hdl, struct sio_ops *ops, 76 unsigned int mode, int nbio) 77 { 78 hdl->ops = ops; 79 hdl->mode = mode; 80 hdl->nbio = nbio; 81 hdl->started = 0; 82 hdl->eof = 0; 83 hdl->move_cb = NULL; 84 hdl->vol_cb = NULL; 85 } 86 87 void 88 sio_close(struct sio_hdl *hdl) 89 { 90 hdl->ops->close(hdl); 91 } 92 93 int 94 sio_start(struct sio_hdl *hdl) 95 { 96 #ifdef DEBUG 97 struct timespec ts; 98 #endif 99 100 if (hdl->eof) { 101 DPRINTF("sio_start: eof\n"); 102 return 0; 103 } 104 if (hdl->started) { 105 DPRINTF("sio_start: already started\n"); 106 hdl->eof = 1; 107 return 0; 108 } 109 hdl->cpos = 0; 110 hdl->rused = hdl->wused = 0; 111 if (!sio_getpar(hdl, &hdl->par)) 112 return 0; 113 #ifdef DEBUG 114 hdl->pollcnt = 0; 115 clock_gettime(CLOCK_MONOTONIC, &ts); 116 hdl->start_nsec = 1000000000LL * ts.tv_sec + ts.tv_nsec; 117 #endif 118 hdl->rdrop = hdl->wsil = 0; 119 if (!hdl->ops->start(hdl)) 120 return 0; 121 hdl->started = 1; 122 return 1; 123 } 124 125 int 126 sio_stop(struct sio_hdl *hdl) 127 { 128 if (hdl->eof) { 129 DPRINTF("sio_stop: eof\n"); 130 return 0; 131 } 132 if (!hdl->started) { 133 DPRINTF("sio_stop: not started\n"); 134 hdl->eof = 1; 135 return 0; 136 } 137 if (!hdl->ops->stop(hdl)) 138 return 0; 139 #ifdef DEBUG 140 DPRINTFN(2, "libsndio: polls: %llu, samples = %llu\n", 141 hdl->pollcnt, hdl->cpos); 142 #endif 143 hdl->started = 0; 144 return 1; 145 } 146 147 int 148 sio_setpar(struct sio_hdl *hdl, struct sio_par *par) 149 { 150 if (hdl->eof) { 151 DPRINTF("sio_setpar: eof\n"); 152 return 0; 153 } 154 if (par->__magic != SIO_PAR_MAGIC) { 155 DPRINTF("sio_setpar: uninitialized sio_par structure\n"); 156 hdl->eof = 1; 157 return 0; 158 } 159 if (hdl->started) { 160 DPRINTF("sio_setpar: already started\n"); 161 hdl->eof = 1; 162 return 0; 163 } 164 if (par->bufsz != ~0U) { 165 DPRINTF("sio_setpar: setting bufsz is deprecated\n"); 166 par->appbufsz = par->bufsz; 167 par->bufsz = ~0U; 168 } 169 if (par->rate != ~0U && par->appbufsz == ~0U) 170 par->appbufsz = par->rate * 200 / 1000; 171 return hdl->ops->setpar(hdl, par); 172 } 173 174 int 175 sio_getpar(struct sio_hdl *hdl, struct sio_par *par) 176 { 177 if (hdl->eof) { 178 DPRINTF("sio_getpar: eof\n"); 179 return 0; 180 } 181 if (hdl->started) { 182 DPRINTF("sio_getpar: already started\n"); 183 hdl->eof = 1; 184 return 0; 185 } 186 if (!hdl->ops->getpar(hdl, par)) { 187 par->__magic = 0; 188 return 0; 189 } 190 par->__magic = 0; 191 return 1; 192 } 193 194 int 195 sio_getcap(struct sio_hdl *hdl, struct sio_cap *cap) 196 { 197 if (hdl->eof) { 198 DPRINTF("sio_getcap: eof\n"); 199 return 0; 200 } 201 if (hdl->started) { 202 DPRINTF("sio_getcap: already started\n"); 203 hdl->eof = 1; 204 return 0; 205 } 206 return hdl->ops->getcap(hdl, cap); 207 } 208 209 static int 210 sio_psleep(struct sio_hdl *hdl, int event) 211 { 212 struct pollfd pfd[SIO_MAXNFDS]; 213 int revents; 214 int nfds; 215 216 nfds = sio_nfds(hdl); 217 if (nfds > SIO_MAXNFDS) { 218 DPRINTF("sio_psleep: %d: too many descriptors\n", nfds); 219 hdl->eof = 1; 220 return 0; 221 } 222 for (;;) { 223 nfds = sio_pollfd(hdl, pfd, event); 224 while (poll(pfd, nfds, -1) < 0) { 225 if (errno == EINTR) 226 continue; 227 DPERROR("sio_psleep: poll"); 228 hdl->eof = 1; 229 return 0; 230 } 231 revents = sio_revents(hdl, pfd); 232 if (revents & POLLHUP) { 233 DPRINTF("sio_psleep: hang-up\n"); 234 return 0; 235 } 236 if (revents & event) 237 break; 238 } 239 return 1; 240 } 241 242 static int 243 sio_rdrop(struct sio_hdl *hdl) 244 { 245 #define DROP_NMAX 0x1000 246 static char dummy[DROP_NMAX]; 247 ssize_t n, todo; 248 249 while (hdl->rdrop > 0) { 250 todo = hdl->rdrop; 251 if (todo > DROP_NMAX) 252 todo = DROP_NMAX; 253 n = hdl->ops->read(hdl, dummy, todo); 254 if (n == 0) 255 return 0; 256 hdl->rdrop -= n; 257 DPRINTF("sio_rdrop: dropped %zu bytes\n", n); 258 } 259 return 1; 260 } 261 262 static int 263 sio_wsil(struct sio_hdl *hdl) 264 { 265 #define ZERO_NMAX 0x1000 266 static char zero[ZERO_NMAX]; 267 ssize_t n, todo; 268 269 while (hdl->wsil > 0) { 270 todo = hdl->wsil; 271 if (todo > ZERO_NMAX) 272 todo = ZERO_NMAX; 273 n = hdl->ops->write(hdl, zero, todo); 274 if (n == 0) 275 return 0; 276 hdl->wsil -= n; 277 DPRINTF("sio_wsil: inserted %zu bytes\n", n); 278 } 279 return 1; 280 } 281 282 size_t 283 sio_read(struct sio_hdl *hdl, void *buf, size_t len) 284 { 285 unsigned int n; 286 char *data = buf; 287 size_t todo = len, maxread; 288 289 if (hdl->eof) { 290 DPRINTF("sio_read: eof\n"); 291 return 0; 292 } 293 if (!hdl->started || !(hdl->mode & SIO_REC)) { 294 DPRINTF("sio_read: recording not started\n"); 295 hdl->eof = 1; 296 return 0; 297 } 298 if (todo == 0) { 299 DPRINTF("sio_read: zero length read ignored\n"); 300 return 0; 301 } 302 while (todo > 0) { 303 if (!sio_rdrop(hdl)) 304 return 0; 305 maxread = hdl->rused; 306 if (maxread > todo) 307 maxread = todo; 308 n = maxread > 0 ? hdl->ops->read(hdl, data, maxread) : 0; 309 if (n == 0) { 310 if (hdl->nbio || hdl->eof || todo < len) 311 break; 312 if (!sio_psleep(hdl, POLLIN)) 313 break; 314 continue; 315 } 316 data += n; 317 todo -= n; 318 hdl->rused -= n; 319 } 320 return len - todo; 321 } 322 323 size_t 324 sio_write(struct sio_hdl *hdl, const void *buf, size_t len) 325 { 326 unsigned int n; 327 const unsigned char *data = buf; 328 size_t todo = len, maxwrite; 329 330 if (hdl->eof) { 331 DPRINTF("sio_write: eof\n"); 332 return 0; 333 } 334 if (!hdl->started || !(hdl->mode & SIO_PLAY)) { 335 DPRINTF("sio_write: playback not started\n"); 336 hdl->eof = 1; 337 return 0; 338 } 339 if (todo == 0) { 340 DPRINTF("sio_write: zero length write ignored\n"); 341 return 0; 342 } 343 while (todo > 0) { 344 if (!sio_wsil(hdl)) 345 return 0; 346 maxwrite = hdl->par.bufsz * hdl->par.pchan * hdl->par.bps - 347 hdl->wused; 348 if (maxwrite > todo) 349 maxwrite = todo; 350 n = maxwrite > 0 ? hdl->ops->write(hdl, data, maxwrite) : 0; 351 if (n == 0) { 352 if (hdl->nbio || hdl->eof) 353 break; 354 if (!sio_psleep(hdl, POLLOUT)) 355 break; 356 continue; 357 } 358 data += n; 359 todo -= n; 360 hdl->wused += n; 361 } 362 return len - todo; 363 } 364 365 int 366 sio_nfds(struct sio_hdl *hdl) 367 { 368 return hdl->ops->nfds(hdl); 369 } 370 371 int 372 sio_pollfd(struct sio_hdl *hdl, struct pollfd *pfd, int events) 373 { 374 if (hdl->eof) 375 return 0; 376 if (!hdl->started) 377 events = 0; 378 return hdl->ops->pollfd(hdl, pfd, events); 379 } 380 381 int 382 sio_revents(struct sio_hdl *hdl, struct pollfd *pfd) 383 { 384 int revents; 385 #ifdef DEBUG 386 struct timespec ts0, ts1; 387 388 if (_sndio_debug >= 4) 389 clock_gettime(CLOCK_MONOTONIC, &ts0); 390 #endif 391 if (hdl->eof) 392 return POLLHUP; 393 #ifdef DEBUG 394 hdl->pollcnt++; 395 #endif 396 revents = hdl->ops->revents(hdl, pfd); 397 if (!hdl->started) 398 return revents & POLLHUP; 399 #ifdef DEBUG 400 if (_sndio_debug >= 4) { 401 clock_gettime(CLOCK_MONOTONIC, &ts1); 402 DPRINTF("%09lld: sio_revents: revents = 0x%x, took %lldns\n", 403 1000000000LL * ts0.tv_sec + 404 ts0.tv_nsec - hdl->start_nsec, 405 revents, 406 1000000000LL * (ts1.tv_sec - ts0.tv_sec) + 407 ts1.tv_nsec - ts0.tv_nsec); 408 } 409 #endif 410 if ((hdl->mode & SIO_PLAY) && !sio_wsil(hdl)) 411 revents &= ~POLLOUT; 412 if ((hdl->mode & SIO_REC) && !sio_rdrop(hdl)) 413 revents &= ~POLLIN; 414 return revents; 415 } 416 417 int 418 sio_eof(struct sio_hdl *hdl) 419 { 420 return hdl->eof; 421 } 422 423 void 424 sio_onmove(struct sio_hdl *hdl, void (*cb)(void *, int), void *addr) 425 { 426 if (hdl->started) { 427 DPRINTF("sio_onmove: already started\n"); 428 hdl->eof = 1; 429 return; 430 } 431 hdl->move_cb = cb; 432 hdl->move_addr = addr; 433 } 434 435 #ifdef DEBUG 436 void 437 _sio_printpos(struct sio_hdl *hdl) 438 { 439 struct timespec ts; 440 long long rpos, rdiff; 441 long long cpos, cdiff; 442 long long wpos, wdiff; 443 unsigned rbpf, wbpf, rround, wround; 444 445 clock_gettime(CLOCK_MONOTONIC, &ts); 446 rbpf = (hdl->mode & SIO_REC) ? hdl->par.bps * hdl->par.rchan : 1; 447 wbpf = (hdl->mode & SIO_PLAY) ? hdl->par.bps * hdl->par.pchan : 1; 448 rround = hdl->par.round * rbpf; 449 wround = hdl->par.round * wbpf; 450 451 rpos = (hdl->mode & SIO_REC) ? 452 hdl->cpos * rbpf - hdl->rused : 0; 453 wpos = (hdl->mode & SIO_PLAY) ? 454 hdl->cpos * wbpf + hdl->wused : 0; 455 456 cdiff = hdl->cpos % hdl->par.round; 457 cpos = hdl->cpos / hdl->par.round; 458 if (cdiff > hdl->par.round / 2) { 459 cpos++; 460 cdiff = cdiff - hdl->par.round; 461 } 462 rdiff = rpos % rround; 463 rpos = rpos / rround; 464 if (rdiff > rround / 2) { 465 rpos++; 466 rdiff = rdiff - rround; 467 } 468 wdiff = wpos % wround; 469 wpos = wpos / wround; 470 if (wdiff > wround / 2) { 471 wpos++; 472 wdiff = wdiff - wround; 473 } 474 DPRINTF("%011lld: " 475 "clk %+5lld%+5lld, wr %+5lld%+5lld rd: %+5lld%+5lld\n", 476 1000000000LL * ts.tv_sec + ts.tv_nsec - hdl->start_nsec, 477 cpos, cdiff, wpos, wdiff, rpos, rdiff); 478 } 479 #endif 480 481 void 482 _sio_onmove_cb(struct sio_hdl *hdl, int delta) 483 { 484 hdl->cpos += delta; 485 if (hdl->mode & SIO_REC) 486 hdl->rused += delta * (hdl->par.bps * hdl->par.rchan); 487 if (hdl->mode & SIO_PLAY) 488 hdl->wused -= delta * (hdl->par.bps * hdl->par.pchan); 489 #ifdef DEBUG 490 if (_sndio_debug >= 3) 491 _sio_printpos(hdl); 492 if ((hdl->mode & SIO_PLAY) && hdl->wused < 0) { 493 DPRINTFN(1, "sndio: h/w failure: negative buffer usage\n"); 494 hdl->eof = 1; 495 return; 496 } 497 #endif 498 if (hdl->move_cb) 499 hdl->move_cb(hdl->move_addr, delta); 500 } 501 502 int 503 sio_setvol(struct sio_hdl *hdl, unsigned int ctl) 504 { 505 if (hdl->eof) 506 return 0; 507 if (!hdl->ops->setvol) 508 return 1; 509 if (!hdl->ops->setvol(hdl, ctl)) 510 return 0; 511 hdl->ops->getvol(hdl); 512 return 1; 513 } 514 515 int 516 sio_onvol(struct sio_hdl *hdl, void (*cb)(void *, unsigned int), void *addr) 517 { 518 if (hdl->started) { 519 DPRINTF("sio_onvol: already started\n"); 520 hdl->eof = 1; 521 return 0; 522 } 523 if (!hdl->ops->setvol) 524 return 0; 525 hdl->vol_cb = cb; 526 hdl->vol_addr = addr; 527 hdl->ops->getvol(hdl); 528 return 1; 529 } 530 531 void 532 _sio_onvol_cb(struct sio_hdl *hdl, unsigned int ctl) 533 { 534 if (hdl->vol_cb) 535 hdl->vol_cb(hdl->vol_addr, ctl); 536 } 537