audio/ossaudio.c

   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 #include <sys/mman.h>
  25 #include <sys/types.h>
  26 #include <sys/ioctl.h>
  27 #include <sys/soundcard.h>
  28 #include "vl.h"
  29
  30 #define AUDIO_CAP "oss"
  31 #include "audio_int.h"
  32
  33 typedef struct OSSVoiceOut {
  34     HWVoiceOut hw;
  35     void *pcm_buf;
  36     int fd;
  37     int nfrags;
  38     int fragsize;
  39     int mmapped;
  40     int old_optr;
  41 } OSSVoiceOut;
  42
  43 typedef struct OSSVoiceIn {
  44     HWVoiceIn hw;
  45     void *pcm_buf;
  46     int fd;
  47     int nfrags;
  48     int fragsize;
  49     int old_optr;
  50 } OSSVoiceIn;
  51
  52 static struct {
  53     int try_mmap;
  54     int nfrags;
  55     int fragsize;
  56     const char *devpath_out;
  57     const char *devpath_in;
  58     int debug;
  59 } conf = {
  60     .try_mmap = 0,
  61     .nfrags = 4,
  62     .fragsize = 4096,
  63     .devpath_out = "/dev/dsp",
  64     .devpath_in = "/dev/dsp",
  65     .debug = 0
  66 };
  67
  68 struct oss_params {
  69     int freq;
  70     audfmt_e fmt;
  71     int nchannels;
  72     int nfrags;
  73     int fragsize;
  74 };
  75
  76 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
  77 {
  78     va_list ap;
  79
  80     va_start (ap, fmt);
  81     AUD_vlog (AUDIO_CAP, fmt, ap);
  82     va_end (ap);
  83
  84     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
  85 }
  86
  87 static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
  88     int err,
  89     const char *typ,
  90     const char *fmt,
  91     ...
  92     )
  93 {
  94     va_list ap;
  95
  96     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
  97
  98     va_start (ap, fmt);
  99     AUD_vlog (AUDIO_CAP, fmt, ap);
 100     va_end (ap);
 101
 102     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
 103 }
 104
 105 static void oss_anal_close (int *fdp)
 106 {
 107     int err = close (*fdp);
 108     if (err) {
 109         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 110     }
 111     *fdp = -1;
 112 }
 113
 114 static int oss_write (SWVoiceOut *sw, void *buf, int len)
 115 {
 116     return audio_pcm_sw_write (sw, buf, len);
 117 }
 118
 119 static int aud_to_ossfmt (audfmt_e fmt)
 120 {
 121     switch (fmt) {
 122     case AUD_FMT_S8:
 123         return AFMT_S8;
 124
 125     case AUD_FMT_U8:
 126         return AFMT_U8;
 127
 128     case AUD_FMT_S16:
 129         return AFMT_S16_LE;
 130
 131     case AUD_FMT_U16:
 132         return AFMT_U16_LE;
 133
 134     default:
 135         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 136 #ifdef DEBUG_AUDIO
 137         abort ();
 138 #endif
 139         return AFMT_U8;
 140     }
 141 }
 142
 143 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
 144 {
 145     switch (ossfmt) {
 146     case AFMT_S8:
 147         *endianness =0;
 148         *fmt = AUD_FMT_S8;
 149         break;
 150
 151     case AFMT_U8:
 152         *endianness = 0;
 153         *fmt = AUD_FMT_U8;
 154         break;
 155
 156     case AFMT_S16_LE:
 157         *endianness = 0;
 158         *fmt = AUD_FMT_S16;
 159         break;
 160
 161     case AFMT_U16_LE:
 162         *endianness = 0;
 163         *fmt = AUD_FMT_U16;
 164         break;
 165
 166     case AFMT_S16_BE:
 167         *endianness = 1;
 168         *fmt = AUD_FMT_S16;
 169         break;
 170
 171     case AFMT_U16_BE:
 172         *endianness = 1;
 173         *fmt = AUD_FMT_U16;
 174         break;
 175
 176     default:
 177         dolog ("Unrecognized audio format %d\n", ossfmt);
 178         return -1;
 179     }
 180
 181     return 0;
 182 }
 183
 184 #if defined DEBUG_MISMATCHES || defined DEBUG
 185 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 186 {
 187     dolog ("parameter | requested value | obtained value\n");
 188     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 189     dolog ("channels  |      %10d |     %10d\n",
 190            req->nchannels, obt->nchannels);
 191     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 192     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 193     dolog ("fragsize  |      %10d |     %10d\n",
 194            req->fragsize, obt->fragsize);
 195 }
 196 #endif
 197
 198 static int oss_open (int in, struct oss_params *req,
 199                      struct oss_params *obt, int *pfd)
 200 {
 201     int fd;
 202     int mmmmssss;
 203     audio_buf_info abinfo;
 204     int fmt, freq, nchannels;
 205     const char *dspname = in ? conf.devpath_in : conf.devpath_out;
 206     const char *typ = in ? "ADC" : "DAC";
 207
 208     fd = open (dspname, (in ? O_RDONLY : O_WRONLY) | O_NONBLOCK);
 209     if (-1 == fd) {
 210         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 211         return -1;
 212     }
 213
 214     freq = req->freq;
 215     nchannels = req->nchannels;
 216     fmt = req->fmt;
 217
 218     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 219         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 220         goto err;
 221     }
 222
 223     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 224         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 225                      req->nchannels);
 226         goto err;
 227     }
 228
 229     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 230         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 231         goto err;
 232     }
 233
 234     if (ioctl (fd, SNDCTL_DSP_NONBLOCK)) {
 235         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 236         goto err;
 237     }
 238
 239     mmmmssss = (req->nfrags << 16) | lsbindex (req->fragsize);
 240     if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 241         oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 242                      req->nfrags, req->fragsize);
 243         goto err;
 244     }
 245
 246     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 247         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 248         goto err;
 249     }
 250
 251     obt->fmt = fmt;
 252     obt->nchannels = nchannels;
 253     obt->freq = freq;
 254     obt->nfrags = abinfo.fragstotal;
 255     obt->fragsize = abinfo.fragsize;
 256     *pfd = fd;
 257
 258 #ifdef DEBUG_MISMATCHES
 259     if ((req->fmt != obt->fmt) ||
 260         (req->nchannels != obt->nchannels) ||
 261         (req->freq != obt->freq) ||
 262         (req->fragsize != obt->fragsize) ||
 263         (req->nfrags != obt->nfrags)) {
 264         dolog ("Audio parameters mismatch\n");
 265         oss_dump_info (req, obt);
 266     }
 267 #endif
 268
 269 #ifdef DEBUG
 270     oss_dump_info (req, obt);
 271 #endif
 272     return 0;
 273
 274  err:
 275     oss_anal_close (&fd);
 276     return -1;
 277 }
 278
 279 static int oss_run_out (HWVoiceOut *hw)
 280 {
 281     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 282     int err, rpos, live, decr;
 283     int samples;
 284     uint8_t *dst;
 285     st_sample_t *src;
 286     struct audio_buf_info abinfo;
 287     struct count_info cntinfo;
 288     int bufsize;
 289
 290     live = audio_pcm_hw_get_live_out (hw);
 291     if (!live) {
 292         return 0;
 293     }
 294
 295     bufsize = hw->samples << hw->info.shift;
 296
 297     if (oss->mmapped) {
 298         int bytes;
 299
 300         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 301         if (err < 0) {
 302             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 303             return 0;
 304         }
 305
 306         if (cntinfo.ptr == oss->old_optr) {
 307             if (abs (hw->samples - live) < 64) {
 308                 dolog ("warning: Overrun\n");
 309             }
 310             return 0;
 311         }
 312
 313         if (cntinfo.ptr > oss->old_optr) {
 314             bytes = cntinfo.ptr - oss->old_optr;
 315         }
 316         else {
 317             bytes = bufsize + cntinfo.ptr - oss->old_optr;
 318         }
 319
 320         decr = audio_MIN (bytes >> hw->info.shift, live);
 321     }
 322     else {
 323         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 324         if (err < 0) {
 325             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 326             return 0;
 327         }
 328
 329         if (abinfo.bytes > bufsize) {
 330             if (conf.debug) {
 331                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
 332                        "please report your OS/audio hw to malc@pulsesoft.com\n",
 333                        abinfo.bytes, bufsize);
 334             }
 335             abinfo.bytes = bufsize;
 336         }
 337
 338         if (abinfo.bytes < 0) {
 339             if (conf.debug) {
 340                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
 341                        abinfo.bytes, bufsize);
 342             }
 343             return 0;
 344         }
 345
 346         decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
 347         if (!decr) {
 348             return 0;
 349         }
 350     }
 351
 352     samples = decr;
 353     rpos = hw->rpos;
 354     while (samples) {
 355         int left_till_end_samples = hw->samples - rpos;
 356         int convert_samples = audio_MIN (samples, left_till_end_samples);
 357
 358         src = hw->mix_buf + rpos;
 359         dst = advance (oss->pcm_buf, rpos << hw->info.shift);
 360
 361         hw->clip (dst, src, convert_samples);
 362         if (!oss->mmapped) {
 363             int written;
 364
 365             written = write (oss->fd, dst, convert_samples << hw->info.shift);
 366             /* XXX: follow errno recommendations ? */
 367             if (written == -1) {
 368                 oss_logerr (
 369                     errno,
 370                     "Failed to write %d bytes of audio data from %p\n",
 371                     convert_samples << hw->info.shift,
 372                     dst
 373                     );
 374                 continue;
 375             }
 376
 377             if (written != convert_samples << hw->info.shift) {
 378                 int wsamples = written >> hw->info.shift;
 379                 int wbytes = wsamples << hw->info.shift;
 380                 if (wbytes != written) {
 381                     dolog ("warning: Misaligned write %d (requested %d), "
 382                            "alignment %d\n",
 383                            wbytes, written, hw->info.align + 1);
 384                 }
 385                 decr -= wsamples;
 386                 rpos = (rpos + wsamples) % hw->samples;
 387                 break;
 388             }
 389         }
 390
 391         rpos = (rpos + convert_samples) % hw->samples;
 392         samples -= convert_samples;
 393     }
 394     if (oss->mmapped) {
 395         oss->old_optr = cntinfo.ptr;
 396     }
 397
 398     hw->rpos = rpos;
 399     return decr;
 400 }
 401
 402 static void oss_fini_out (HWVoiceOut *hw)
 403 {
 404     int err;
 405     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 406
 407     ldebug ("oss_fini\n");
 408     oss_anal_close (&oss->fd);
 409
 410     if (oss->pcm_buf) {
 411         if (oss->mmapped) {
 412             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 413             if (err) {
 414                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 415                             oss->pcm_buf, hw->samples << hw->info.shift);
 416             }
 417         }
 418         else {
 419             qemu_free (oss->pcm_buf);
 420         }
 421         oss->pcm_buf = NULL;
 422     }
 423 }
 424
 425 static int oss_init_out (HWVoiceOut *hw, audsettings_t *as)
 426 {
 427     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 428     struct oss_params req, obt;
 429     int endianness;
 430     int err;
 431     int fd;
 432     audfmt_e effective_fmt;
 433     audsettings_t obt_as;
 434
 435     oss->fd = -1;
 436
 437     req.fmt = aud_to_ossfmt (as->fmt);
 438     req.freq = as->freq;
 439     req.nchannels = as->nchannels;
 440     req.fragsize = conf.fragsize;
 441     req.nfrags = conf.nfrags;
 442
 443     if (oss_open (0, &req, &obt, &fd)) {
 444         return -1;
 445     }
 446
 447     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 448     if (err) {
 449         oss_anal_close (&fd);
 450         return -1;
 451     }
 452
 453     obt_as.freq = obt.freq;
 454     obt_as.nchannels = obt.nchannels;
 455     obt_as.fmt = effective_fmt;
 456     obt_as.endianness = endianness;
 457
 458     audio_pcm_init_info (&hw->info, &obt_as);
 459     oss->nfrags = obt.nfrags;
 460     oss->fragsize = obt.fragsize;
 461
 462     if (obt.nfrags * obt.fragsize & hw->info.align) {
 463         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 464                obt.nfrags * obt.fragsize, hw->info.align + 1);
 465     }
 466
 467     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 468
 469     oss->mmapped = 0;
 470     if (conf.try_mmap) {
 471         oss->pcm_buf = mmap (
 472             0,
 473             hw->samples << hw->info.shift,
 474             PROT_READ | PROT_WRITE,
 475             MAP_SHARED,
 476             fd,
 477             0
 478             );
 479         if (oss->pcm_buf == MAP_FAILED) {
 480             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 481                         hw->samples << hw->info.shift);
 482         } else {
 483             int err;
 484             int trig = 0;
 485             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 486                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 487             }
 488             else {
 489                 trig = PCM_ENABLE_OUTPUT;
 490                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 491                     oss_logerr (
 492                         errno,
 493                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 494                         );
 495                 }
 496                 else {
 497                     oss->mmapped = 1;
 498                 }
 499             }
 500
 501             if (!oss->mmapped) {
 502                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 503                 if (err) {
 504                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 505                                 oss->pcm_buf, hw->samples << hw->info.shift);
 506                 }
 507             }
 508         }
 509     }
 510
 511     if (!oss->mmapped) {
 512         oss->pcm_buf = audio_calloc (
 513             AUDIO_FUNC,
 514             hw->samples,
 515             1 << hw->info.shift
 516             );
 517         if (!oss->pcm_buf) {
 518             dolog (
 519                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 520                 hw->samples,
 521                 1 << hw->info.shift
 522                 );
 523             oss_anal_close (&fd);
 524             return -1;
 525         }
 526     }
 527
 528     oss->fd = fd;
 529     return 0;
 530 }
 531
 532 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 533 {
 534     int trig;
 535     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 536
 537     if (!oss->mmapped) {
 538         return 0;
 539     }
 540
 541     switch (cmd) {
 542     case VOICE_ENABLE:
 543         ldebug ("enabling voice\n");
 544         audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 545         trig = PCM_ENABLE_OUTPUT;
 546         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 547             oss_logerr (
 548                 errno,
 549                 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 550                 );
 551             return -1;
 552         }
 553         break;
 554
 555     case VOICE_DISABLE:
 556         ldebug ("disabling voice\n");
 557         trig = 0;
 558         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 559             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 560             return -1;
 561         }
 562         break;
 563     }
 564     return 0;
 565 }
 566
 567 static int oss_init_in (HWVoiceIn *hw, audsettings_t *as)
 568 {
 569     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 570     struct oss_params req, obt;
 571     int endianness;
 572     int err;
 573     int fd;
 574     audfmt_e effective_fmt;
 575     audsettings_t obt_as;
 576
 577     oss->fd = -1;
 578
 579     req.fmt = aud_to_ossfmt (as->fmt);
 580     req.freq = as->freq;
 581     req.nchannels = as->nchannels;
 582     req.fragsize = conf.fragsize;
 583     req.nfrags = conf.nfrags;
 584     if (oss_open (1, &req, &obt, &fd)) {
 585         return -1;
 586     }
 587
 588     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 589     if (err) {
 590         oss_anal_close (&fd);
 591         return -1;
 592     }
 593
 594     obt_as.freq = obt.freq;
 595     obt_as.nchannels = obt.nchannels;
 596     obt_as.fmt = effective_fmt;
 597     obt_as.endianness = endianness;
 598
 599     audio_pcm_init_info (&hw->info, &obt_as);
 600     oss->nfrags = obt.nfrags;
 601     oss->fragsize = obt.fragsize;
 602
 603     if (obt.nfrags * obt.fragsize & hw->info.align) {
 604         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 605                obt.nfrags * obt.fragsize, hw->info.align + 1);
 606     }
 607
 608     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 609     oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 610     if (!oss->pcm_buf) {
 611         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 612                hw->samples, 1 << hw->info.shift);
 613         oss_anal_close (&fd);
 614         return -1;
 615     }
 616
 617     oss->fd = fd;
 618     return 0;
 619 }
 620
 621 static void oss_fini_in (HWVoiceIn *hw)
 622 {
 623     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 624
 625     oss_anal_close (&oss->fd);
 626
 627     if (oss->pcm_buf) {
 628         qemu_free (oss->pcm_buf);
 629         oss->pcm_buf = NULL;
 630     }
 631 }
 632
 633 static int oss_run_in (HWVoiceIn *hw)
 634 {
 635     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 636     int hwshift = hw->info.shift;
 637     int i;
 638     int live = audio_pcm_hw_get_live_in (hw);
 639     int dead = hw->samples - live;
 640     size_t read_samples = 0;
 641     struct {
 642         int add;
 643         int len;
 644     } bufs[2] = {
 645         { hw->wpos, 0 },
 646         { 0, 0 }
 647     };
 648
 649     if (!dead) {
 650         return 0;
 651     }
 652
 653     if (hw->wpos + dead > hw->samples) {
 654         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 655         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 656     }
 657     else {
 658         bufs[0].len = dead << hwshift;
 659     }
 660
 661
 662     for (i = 0; i < 2; ++i) {
 663         ssize_t nread;
 664
 665         if (bufs[i].len) {
 666             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 667             nread = read (oss->fd, p, bufs[i].len);
 668
 669             if (nread > 0) {
 670                 if (nread & hw->info.align) {
 671                     dolog ("warning: Misaligned read %zd (requested %d), "
 672                            "alignment %d\n", nread, bufs[i].add << hwshift,
 673                            hw->info.align + 1);
 674                 }
 675                 read_samples += nread >> hwshift;
 676                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
 677                           &nominal_volume);
 678             }
 679
 680             if (bufs[i].len - nread) {
 681                 if (nread == -1) {
 682                     switch (errno) {
 683                     case EINTR:
 684                     case EAGAIN:
 685                         break;
 686                     default:
 687                         oss_logerr (
 688                             errno,
 689                             "Failed to read %d bytes of audio (to %p)\n",
 690                             bufs[i].len, p
 691                             );
 692                         break;
 693                     }
 694                 }
 695                 break;
 696             }
 697         }
 698     }
 699
 700     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 701     return read_samples;
 702 }
 703
 704 static int oss_read (SWVoiceIn *sw, void *buf, int size)
 705 {
 706     return audio_pcm_sw_read (sw, buf, size);
 707 }
 708
 709 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 710 {
 711     (void) hw;
 712     (void) cmd;
 713     return 0;
 714 }
 715
 716 static void *oss_audio_init (void)
 717 {
 718     return &conf;
 719 }
 720
 721 static void oss_audio_fini (void *opaque)
 722 {
 723     (void) opaque;
 724 }
 725
 726 static struct audio_option oss_options[] = {
 727     {"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
 728      "Fragment size in bytes", NULL, 0},
 729     {"NFRAGS", AUD_OPT_INT, &conf.nfrags,
 730      "Number of fragments", NULL, 0},
 731     {"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
 732      "Try using memory mapped access", NULL, 0},
 733     {"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
 734      "Path to DAC device", NULL, 0},
 735     {"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
 736      "Path to ADC device", NULL, 0},
 737     {"DEBUG", AUD_OPT_BOOL, &conf.debug,
 738      "Turn on some debugging messages", NULL, 0},
 739     {NULL, 0, NULL, NULL, NULL, 0}
 740 };
 741
 742 static struct audio_pcm_ops oss_pcm_ops = {
 743     oss_init_out,
 744     oss_fini_out,
 745     oss_run_out,
 746     oss_write,
 747     oss_ctl_out,
 748
 749     oss_init_in,
 750     oss_fini_in,
 751     oss_run_in,
 752     oss_read,
 753     oss_ctl_in
 754 };
 755
 756 struct audio_driver oss_audio_driver = {
 757     INIT_FIELD (name           = ) "oss",
 758     INIT_FIELD (descr          = ) "OSS http://www.opensound.com",
 759     INIT_FIELD (options        = ) oss_options,
 760     INIT_FIELD (init           = ) oss_audio_init,
 761     INIT_FIELD (fini           = ) oss_audio_fini,
 762     INIT_FIELD (pcm_ops        = ) &oss_pcm_ops,
 763     INIT_FIELD (can_be_default = ) 1,
 764     INIT_FIELD (max_voices_out = ) INT_MAX,
 765     INIT_FIELD (max_voices_in  = ) INT_MAX,
 766     INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
 767     INIT_FIELD (voice_size_in  = ) sizeof (OSSVoiceIn)
 768 };