1 /* 2 * QEMU OSS audio driver 3 * 4 * Copyright (c) 2003-2005 Vassili Karpov (malc) 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include <sys/ioctl.h> 27 #include <sys/soundcard.h> 28 #include "qemu/main-loop.h" 29 #include "qemu/module.h" 30 #include "qemu/host-utils.h" 31 #include "audio.h" 32 #include "trace.h" 33 34 #define AUDIO_CAP "oss" 35 #include "audio_int.h" 36 37 #if defined OSS_GETVERSION && defined SNDCTL_DSP_POLICY 38 #define USE_DSP_POLICY 39 #endif 40 41 typedef struct OSSVoiceOut { 42 HWVoiceOut hw; 43 int fd; 44 int nfrags; 45 int fragsize; 46 int mmapped; 47 Audiodev *dev; 48 } OSSVoiceOut; 49 50 typedef struct OSSVoiceIn { 51 HWVoiceIn hw; 52 int fd; 53 int nfrags; 54 int fragsize; 55 Audiodev *dev; 56 } OSSVoiceIn; 57 58 struct oss_params { 59 int freq; 60 int fmt; 61 int nchannels; 62 int nfrags; 63 int fragsize; 64 }; 65 66 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...) 67 { 68 va_list ap; 69 70 va_start (ap, fmt); 71 AUD_vlog (AUDIO_CAP, fmt, ap); 72 va_end (ap); 73 74 AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err)); 75 } 76 77 static void GCC_FMT_ATTR (3, 4) oss_logerr2 ( 78 int err, 79 const char *typ, 80 const char *fmt, 81 ... 82 ) 83 { 84 va_list ap; 85 86 AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ); 87 88 va_start (ap, fmt); 89 AUD_vlog (AUDIO_CAP, fmt, ap); 90 va_end (ap); 91 92 AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err)); 93 } 94 95 static void oss_anal_close (int *fdp) 96 { 97 int err; 98 99 qemu_set_fd_handler (*fdp, NULL, NULL, NULL); 100 err = close (*fdp); 101 if (err) { 102 oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp); 103 } 104 *fdp = -1; 105 } 106 107 static void oss_helper_poll_out (void *opaque) 108 { 109 AudioState *s = opaque; 110 audio_run(s, "oss_poll_out"); 111 } 112 113 static void oss_helper_poll_in (void *opaque) 114 { 115 AudioState *s = opaque; 116 audio_run(s, "oss_poll_in"); 117 } 118 119 static void oss_poll_out (HWVoiceOut *hw) 120 { 121 OSSVoiceOut *oss = (OSSVoiceOut *) hw; 122 123 qemu_set_fd_handler(oss->fd, NULL, oss_helper_poll_out, hw->s); 124 } 125 126 static void oss_poll_in (HWVoiceIn *hw) 127 { 128 OSSVoiceIn *oss = (OSSVoiceIn *) hw; 129 130 qemu_set_fd_handler(oss->fd, oss_helper_poll_in, NULL, hw->s); 131 } 132 133 static int aud_to_ossfmt (AudioFormat fmt, int endianness) 134 { 135 switch (fmt) { 136 case AUDIO_FORMAT_S8: 137 return AFMT_S8; 138 139 case AUDIO_FORMAT_U8: 140 return AFMT_U8; 141 142 case AUDIO_FORMAT_S16: 143 if (endianness) { 144 return AFMT_S16_BE; 145 } 146 else { 147 return AFMT_S16_LE; 148 } 149 150 case AUDIO_FORMAT_U16: 151 if (endianness) { 152 return AFMT_U16_BE; 153 } 154 else { 155 return AFMT_U16_LE; 156 } 157 158 default: 159 dolog ("Internal logic error: Bad audio format %d\n", fmt); 160 #ifdef DEBUG_AUDIO 161 abort (); 162 #endif 163 return AFMT_U8; 164 } 165 } 166 167 static int oss_to_audfmt (int ossfmt, AudioFormat *fmt, int *endianness) 168 { 169 switch (ossfmt) { 170 case AFMT_S8: 171 *endianness = 0; 172 *fmt = AUDIO_FORMAT_S8; 173 break; 174 175 case AFMT_U8: 176 *endianness = 0; 177 *fmt = AUDIO_FORMAT_U8; 178 break; 179 180 case AFMT_S16_LE: 181 *endianness = 0; 182 *fmt = AUDIO_FORMAT_S16; 183 break; 184 185 case AFMT_U16_LE: 186 *endianness = 0; 187 *fmt = AUDIO_FORMAT_U16; 188 break; 189 190 case AFMT_S16_BE: 191 *endianness = 1; 192 *fmt = AUDIO_FORMAT_S16; 193 break; 194 195 case AFMT_U16_BE: 196 *endianness = 1; 197 *fmt = AUDIO_FORMAT_U16; 198 break; 199 200 default: 201 dolog ("Unrecognized audio format %d\n", ossfmt); 202 return -1; 203 } 204 205 return 0; 206 } 207 208 #if defined DEBUG_MISMATCHES || defined DEBUG 209 static void oss_dump_info (struct oss_params *req, struct oss_params *obt) 210 { 211 dolog ("parameter | requested value | obtained value\n"); 212 dolog ("format | %10d | %10d\n", req->fmt, obt->fmt); 213 dolog ("channels | %10d | %10d\n", 214 req->nchannels, obt->nchannels); 215 dolog ("frequency | %10d | %10d\n", req->freq, obt->freq); 216 dolog ("nfrags | %10d | %10d\n", req->nfrags, obt->nfrags); 217 dolog ("fragsize | %10d | %10d\n", 218 req->fragsize, obt->fragsize); 219 } 220 #endif 221 222 #ifdef USE_DSP_POLICY 223 static int oss_get_version (int fd, int *version, const char *typ) 224 { 225 if (ioctl (fd, OSS_GETVERSION, &version)) { 226 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) 227 /* 228 * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION 229 * since 7.x, but currently only on the mixer device (or in 230 * the Linuxolator), and in the native version that part of 231 * the code is in fact never reached so the ioctl fails anyway. 232 * Until this is fixed, just check the errno and if its what 233 * FreeBSD's sound drivers return atm assume they are new enough. 234 */ 235 if (errno == EINVAL) { 236 *version = 0x040000; 237 return 0; 238 } 239 #endif 240 oss_logerr2 (errno, typ, "Failed to get OSS version\n"); 241 return -1; 242 } 243 return 0; 244 } 245 #endif 246 247 static int oss_open(int in, struct oss_params *req, audsettings *as, 248 struct oss_params *obt, int *pfd, Audiodev *dev) 249 { 250 AudiodevOssOptions *oopts = &dev->u.oss; 251 AudiodevOssPerDirectionOptions *opdo = in ? oopts->in : oopts->out; 252 int fd; 253 int oflags = (oopts->has_exclusive && oopts->exclusive) ? O_EXCL : 0; 254 audio_buf_info abinfo; 255 int fmt, freq, nchannels; 256 int setfragment = 1; 257 const char *dspname = opdo->has_dev ? opdo->dev : "/dev/dsp"; 258 const char *typ = in ? "ADC" : "DAC"; 259 #ifdef USE_DSP_POLICY 260 int policy = oopts->has_dsp_policy ? oopts->dsp_policy : 5; 261 #endif 262 263 /* Kludge needed to have working mmap on Linux */ 264 oflags |= (oopts->has_try_mmap && oopts->try_mmap) ? 265 O_RDWR : (in ? O_RDONLY : O_WRONLY); 266 267 fd = open (dspname, oflags | O_NONBLOCK); 268 if (-1 == fd) { 269 oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname); 270 return -1; 271 } 272 273 freq = req->freq; 274 nchannels = req->nchannels; 275 fmt = req->fmt; 276 req->nfrags = opdo->has_buffer_count ? opdo->buffer_count : 4; 277 req->fragsize = audio_buffer_bytes( 278 qapi_AudiodevOssPerDirectionOptions_base(opdo), as, 23220); 279 280 if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) { 281 oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt); 282 goto err; 283 } 284 285 if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) { 286 oss_logerr2 (errno, typ, "Failed to set number of channels %d\n", 287 req->nchannels); 288 goto err; 289 } 290 291 if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) { 292 oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq); 293 goto err; 294 } 295 296 if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) { 297 oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n"); 298 goto err; 299 } 300 301 #ifdef USE_DSP_POLICY 302 if (policy >= 0) { 303 int version; 304 305 if (!oss_get_version (fd, &version, typ)) { 306 trace_oss_version(version); 307 308 if (version >= 0x040000) { 309 int policy2 = policy; 310 if (ioctl(fd, SNDCTL_DSP_POLICY, &policy2)) { 311 oss_logerr2 (errno, typ, 312 "Failed to set timing policy to %d\n", 313 policy); 314 goto err; 315 } 316 setfragment = 0; 317 } 318 } 319 } 320 #endif 321 322 if (setfragment) { 323 int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize); 324 if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) { 325 oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n", 326 req->nfrags, req->fragsize); 327 goto err; 328 } 329 } 330 331 if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) { 332 oss_logerr2 (errno, typ, "Failed to get buffer length\n"); 333 goto err; 334 } 335 336 if (!abinfo.fragstotal || !abinfo.fragsize) { 337 AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n", 338 abinfo.fragstotal, abinfo.fragsize, typ); 339 goto err; 340 } 341 342 obt->fmt = fmt; 343 obt->nchannels = nchannels; 344 obt->freq = freq; 345 obt->nfrags = abinfo.fragstotal; 346 obt->fragsize = abinfo.fragsize; 347 *pfd = fd; 348 349 #ifdef DEBUG_MISMATCHES 350 if ((req->fmt != obt->fmt) || 351 (req->nchannels != obt->nchannels) || 352 (req->freq != obt->freq) || 353 (req->fragsize != obt->fragsize) || 354 (req->nfrags != obt->nfrags)) { 355 dolog ("Audio parameters mismatch\n"); 356 oss_dump_info (req, obt); 357 } 358 #endif 359 360 #ifdef DEBUG 361 oss_dump_info (req, obt); 362 #endif 363 return 0; 364 365 err: 366 oss_anal_close (&fd); 367 return -1; 368 } 369 370 static size_t oss_get_available_bytes(OSSVoiceOut *oss) 371 { 372 int err; 373 struct count_info cntinfo; 374 assert(oss->mmapped); 375 376 err = ioctl(oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo); 377 if (err < 0) { 378 oss_logerr(errno, "SNDCTL_DSP_GETOPTR failed\n"); 379 return 0; 380 } 381 382 return audio_ring_dist(cntinfo.ptr, oss->hw.pos_emul, oss->hw.size_emul); 383 } 384 385 static void *oss_get_buffer_out(HWVoiceOut *hw, size_t *size) 386 { 387 OSSVoiceOut *oss = (OSSVoiceOut *) hw; 388 if (oss->mmapped) { 389 *size = MIN(oss_get_available_bytes(oss), hw->size_emul - hw->pos_emul); 390 return hw->buf_emul + hw->pos_emul; 391 } else { 392 return audio_generic_get_buffer_out(hw, size); 393 } 394 } 395 396 static size_t oss_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size) 397 { 398 OSSVoiceOut *oss = (OSSVoiceOut *) hw; 399 if (oss->mmapped) { 400 assert(buf == hw->buf_emul + hw->pos_emul && size < hw->size_emul); 401 402 hw->pos_emul = (hw->pos_emul + size) % hw->size_emul; 403 return size; 404 } else { 405 return audio_generic_put_buffer_out(hw, buf, size); 406 } 407 } 408 409 static size_t oss_write(HWVoiceOut *hw, void *buf, size_t len) 410 { 411 OSSVoiceOut *oss = (OSSVoiceOut *) hw; 412 size_t pos; 413 414 if (oss->mmapped) { 415 size_t total_len; 416 len = MIN(len, oss_get_available_bytes(oss)); 417 418 total_len = len; 419 while (len) { 420 size_t to_copy = MIN(len, hw->size_emul - hw->pos_emul); 421 memcpy(hw->buf_emul + hw->pos_emul, buf, to_copy); 422 423 hw->pos_emul = (hw->pos_emul + to_copy) % hw->pos_emul; 424 buf += to_copy; 425 len -= to_copy; 426 } 427 return total_len; 428 } 429 430 pos = 0; 431 while (len) { 432 ssize_t bytes_written; 433 void *pcm = advance(buf, pos); 434 435 bytes_written = write(oss->fd, pcm, len); 436 if (bytes_written < 0) { 437 if (errno != EAGAIN) { 438 oss_logerr(errno, "failed to write %zu bytes\n", 439 len); 440 } 441 return pos; 442 } 443 444 pos += bytes_written; 445 if (bytes_written < len) { 446 break; 447 } 448 len -= bytes_written; 449 } 450 return pos; 451 } 452 453 static void oss_fini_out (HWVoiceOut *hw) 454 { 455 int err; 456 OSSVoiceOut *oss = (OSSVoiceOut *) hw; 457 458 ldebug ("oss_fini\n"); 459 oss_anal_close (&oss->fd); 460 461 if (oss->mmapped && hw->buf_emul) { 462 err = munmap(hw->buf_emul, hw->size_emul); 463 if (err) { 464 oss_logerr(errno, "Failed to unmap buffer %p, size %zu\n", 465 hw->buf_emul, hw->size_emul); 466 } 467 hw->buf_emul = NULL; 468 } 469 } 470 471 static int oss_init_out(HWVoiceOut *hw, struct audsettings *as, 472 void *drv_opaque) 473 { 474 OSSVoiceOut *oss = (OSSVoiceOut *) hw; 475 struct oss_params req, obt; 476 int endianness; 477 int err; 478 int fd; 479 AudioFormat effective_fmt; 480 struct audsettings obt_as; 481 Audiodev *dev = drv_opaque; 482 AudiodevOssOptions *oopts = &dev->u.oss; 483 484 oss->fd = -1; 485 486 req.fmt = aud_to_ossfmt (as->fmt, as->endianness); 487 req.freq = as->freq; 488 req.nchannels = as->nchannels; 489 490 if (oss_open(0, &req, as, &obt, &fd, dev)) { 491 return -1; 492 } 493 494 err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness); 495 if (err) { 496 oss_anal_close (&fd); 497 return -1; 498 } 499 500 obt_as.freq = obt.freq; 501 obt_as.nchannels = obt.nchannels; 502 obt_as.fmt = effective_fmt; 503 obt_as.endianness = endianness; 504 505 audio_pcm_init_info (&hw->info, &obt_as); 506 oss->nfrags = obt.nfrags; 507 oss->fragsize = obt.fragsize; 508 509 if (obt.nfrags * obt.fragsize % hw->info.bytes_per_frame) { 510 dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n", 511 obt.nfrags * obt.fragsize, hw->info.bytes_per_frame); 512 } 513 514 hw->samples = (obt.nfrags * obt.fragsize) / hw->info.bytes_per_frame; 515 516 oss->mmapped = 0; 517 if (oopts->has_try_mmap && oopts->try_mmap) { 518 hw->size_emul = hw->samples * hw->info.bytes_per_frame; 519 hw->buf_emul = mmap( 520 NULL, 521 hw->size_emul, 522 PROT_READ | PROT_WRITE, 523 MAP_SHARED, 524 fd, 525 0 526 ); 527 if (hw->buf_emul == MAP_FAILED) { 528 oss_logerr(errno, "Failed to map %zu bytes of DAC\n", 529 hw->size_emul); 530 hw->buf_emul = NULL; 531 } else { 532 int err; 533 int trig = 0; 534 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) { 535 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n"); 536 } 537 else { 538 trig = PCM_ENABLE_OUTPUT; 539 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) { 540 oss_logerr ( 541 errno, 542 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n" 543 ); 544 } 545 else { 546 oss->mmapped = 1; 547 } 548 } 549 550 if (!oss->mmapped) { 551 err = munmap(hw->buf_emul, hw->size_emul); 552 if (err) { 553 oss_logerr(errno, "Failed to unmap buffer %p size %zu\n", 554 hw->buf_emul, hw->size_emul); 555 } 556 hw->buf_emul = NULL; 557 } 558 } 559 } 560 561 oss->fd = fd; 562 oss->dev = dev; 563 return 0; 564 } 565 566 static void oss_enable_out(HWVoiceOut *hw, bool enable) 567 { 568 int trig; 569 OSSVoiceOut *oss = (OSSVoiceOut *) hw; 570 AudiodevOssPerDirectionOptions *opdo = oss->dev->u.oss.out; 571 572 if (enable) { 573 bool poll_mode = opdo->try_poll; 574 575 ldebug("enabling voice\n"); 576 if (poll_mode) { 577 oss_poll_out(hw); 578 poll_mode = 0; 579 } 580 hw->poll_mode = poll_mode; 581 582 if (!oss->mmapped) { 583 return; 584 } 585 586 audio_pcm_info_clear_buf(&hw->info, hw->buf_emul, hw->mix_buf->size); 587 trig = PCM_ENABLE_OUTPUT; 588 if (ioctl(oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) { 589 oss_logerr(errno, 590 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"); 591 return; 592 } 593 } else { 594 if (hw->poll_mode) { 595 qemu_set_fd_handler (oss->fd, NULL, NULL, NULL); 596 hw->poll_mode = 0; 597 } 598 599 if (!oss->mmapped) { 600 return; 601 } 602 603 ldebug ("disabling voice\n"); 604 trig = 0; 605 if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) { 606 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n"); 607 return; 608 } 609 } 610 } 611 612 static int oss_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque) 613 { 614 OSSVoiceIn *oss = (OSSVoiceIn *) hw; 615 struct oss_params req, obt; 616 int endianness; 617 int err; 618 int fd; 619 AudioFormat effective_fmt; 620 struct audsettings obt_as; 621 Audiodev *dev = drv_opaque; 622 623 oss->fd = -1; 624 625 req.fmt = aud_to_ossfmt (as->fmt, as->endianness); 626 req.freq = as->freq; 627 req.nchannels = as->nchannels; 628 if (oss_open(1, &req, as, &obt, &fd, dev)) { 629 return -1; 630 } 631 632 err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness); 633 if (err) { 634 oss_anal_close (&fd); 635 return -1; 636 } 637 638 obt_as.freq = obt.freq; 639 obt_as.nchannels = obt.nchannels; 640 obt_as.fmt = effective_fmt; 641 obt_as.endianness = endianness; 642 643 audio_pcm_init_info (&hw->info, &obt_as); 644 oss->nfrags = obt.nfrags; 645 oss->fragsize = obt.fragsize; 646 647 if (obt.nfrags * obt.fragsize % hw->info.bytes_per_frame) { 648 dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n", 649 obt.nfrags * obt.fragsize, hw->info.bytes_per_frame); 650 } 651 652 hw->samples = (obt.nfrags * obt.fragsize) / hw->info.bytes_per_frame; 653 654 oss->fd = fd; 655 oss->dev = dev; 656 return 0; 657 } 658 659 static void oss_fini_in (HWVoiceIn *hw) 660 { 661 OSSVoiceIn *oss = (OSSVoiceIn *) hw; 662 663 oss_anal_close (&oss->fd); 664 } 665 666 static size_t oss_read(HWVoiceIn *hw, void *buf, size_t len) 667 { 668 OSSVoiceIn *oss = (OSSVoiceIn *) hw; 669 size_t pos = 0; 670 671 while (len) { 672 ssize_t nread; 673 674 void *dst = advance(buf, pos); 675 nread = read(oss->fd, dst, len); 676 677 if (nread == -1) { 678 switch (errno) { 679 case EINTR: 680 case EAGAIN: 681 break; 682 default: 683 oss_logerr(errno, "Failed to read %zu bytes of audio (to %p)\n", 684 len, dst); 685 break; 686 } 687 } 688 689 pos += nread; 690 len -= nread; 691 } 692 693 return pos; 694 } 695 696 static void oss_enable_in(HWVoiceIn *hw, bool enable) 697 { 698 OSSVoiceIn *oss = (OSSVoiceIn *) hw; 699 AudiodevOssPerDirectionOptions *opdo = oss->dev->u.oss.out; 700 701 if (enable) { 702 bool poll_mode = opdo->try_poll; 703 704 if (poll_mode) { 705 oss_poll_in(hw); 706 poll_mode = 0; 707 } 708 hw->poll_mode = poll_mode; 709 } else { 710 if (hw->poll_mode) { 711 hw->poll_mode = 0; 712 qemu_set_fd_handler (oss->fd, NULL, NULL, NULL); 713 } 714 } 715 } 716 717 static void oss_init_per_direction(AudiodevOssPerDirectionOptions *opdo) 718 { 719 if (!opdo->has_try_poll) { 720 opdo->try_poll = true; 721 opdo->has_try_poll = true; 722 } 723 } 724 725 static void *oss_audio_init(Audiodev *dev) 726 { 727 AudiodevOssOptions *oopts; 728 assert(dev->driver == AUDIODEV_DRIVER_OSS); 729 730 oopts = &dev->u.oss; 731 oss_init_per_direction(oopts->in); 732 oss_init_per_direction(oopts->out); 733 734 if (access(oopts->in->has_dev ? oopts->in->dev : "/dev/dsp", 735 R_OK | W_OK) < 0 || 736 access(oopts->out->has_dev ? oopts->out->dev : "/dev/dsp", 737 R_OK | W_OK) < 0) { 738 return NULL; 739 } 740 return dev; 741 } 742 743 static void oss_audio_fini (void *opaque) 744 { 745 } 746 747 static struct audio_pcm_ops oss_pcm_ops = { 748 .init_out = oss_init_out, 749 .fini_out = oss_fini_out, 750 .write = oss_write, 751 .get_buffer_out = oss_get_buffer_out, 752 .put_buffer_out = oss_put_buffer_out, 753 .enable_out = oss_enable_out, 754 755 .init_in = oss_init_in, 756 .fini_in = oss_fini_in, 757 .read = oss_read, 758 .enable_in = oss_enable_in 759 }; 760 761 static struct audio_driver oss_audio_driver = { 762 .name = "oss", 763 .descr = "OSS http://www.opensound.com", 764 .init = oss_audio_init, 765 .fini = oss_audio_fini, 766 .pcm_ops = &oss_pcm_ops, 767 .can_be_default = 1, 768 .max_voices_out = INT_MAX, 769 .max_voices_in = INT_MAX, 770 .voice_size_out = sizeof (OSSVoiceOut), 771 .voice_size_in = sizeof (OSSVoiceIn) 772 }; 773 774 static void register_audio_oss(void) 775 { 776 audio_driver_register(&oss_audio_driver); 777 } 778 type_init(register_audio_oss); 779