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 <stdlib.h>
  25 #include <sys/mman.h>
  26 #include <sys/types.h>
  27 #include <sys/ioctl.h>
  28 #ifdef __OpenBSD__
  29 #include <soundcard.h>
  30 #else
  31 #include <sys/soundcard.h>
  32 #endif
  33 #include "vl.h"
  34
  35 #define AUDIO_CAP "oss"
  36 #include "audio_int.h"
  37
  38 typedef struct OSSVoiceOut {
  39     HWVoiceOut hw;
  40     void *pcm_buf;
  41     int fd;
  42     int nfrags;
  43     int fragsize;
  44     int mmapped;
  45     int old_optr;
  46 } OSSVoiceOut;
  47
  48 typedef struct OSSVoiceIn {
  49     HWVoiceIn hw;
  50     void *pcm_buf;
  51     int fd;
  52     int nfrags;
  53     int fragsize;
  54     int old_optr;
  55 } OSSVoiceIn;
  56
  57 static struct {
  58     int try_mmap;
  59     int nfrags;
  60     int fragsize;
  61     const char *devpath_out;
  62     const char *devpath_in;
  63     int debug;
  64 } conf = {
  65     .try_mmap = 0,
  66     .nfrags = 4,
  67     .fragsize = 4096,
  68     .devpath_out = "/dev/dsp",
  69     .devpath_in = "/dev/dsp",
  70     .debug = 0
  71 };
  72
  73 struct oss_params {
  74     int freq;
  75     audfmt_e fmt;
  76     int nchannels;
  77     int nfrags;
  78     int fragsize;
  79 };
  80
  81 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
  82 {
  83     va_list ap;
  84
  85     va_start (ap, fmt);
  86     AUD_vlog (AUDIO_CAP, fmt, ap);
  87     va_end (ap);
  88
  89     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
  90 }
  91
  92 static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
  93     int err,
  94     const char *typ,
  95     const char *fmt,
  96     ...
  97     )
  98 {
  99     va_list ap;
 100
 101     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 102
 103     va_start (ap, fmt);
 104     AUD_vlog (AUDIO_CAP, fmt, ap);
 105     va_end (ap);
 106
 107     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
 108 }
 109
 110 static void oss_anal_close (int *fdp)
 111 {
 112     int err = close (*fdp);
 113     if (err) {
 114         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 115     }
 116     *fdp = -1;
 117 }
 118
 119 static int oss_write (SWVoiceOut *sw, void *buf, int len)
 120 {
 121     return audio_pcm_sw_write (sw, buf, len);
 122 }
 123
 124 static int aud_to_ossfmt (audfmt_e fmt)
 125 {
 126     switch (fmt) {
 127     case AUD_FMT_S8:
 128         return AFMT_S8;
 129
 130     case AUD_FMT_U8:
 131         return AFMT_U8;
 132
 133     case AUD_FMT_S16:
 134         return AFMT_S16_LE;
 135
 136     case AUD_FMT_U16:
 137         return AFMT_U16_LE;
 138
 139     default:
 140         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 141 #ifdef DEBUG_AUDIO
 142         abort ();
 143 #endif
 144         return AFMT_U8;
 145     }
 146 }
 147
 148 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
 149 {
 150     switch (ossfmt) {
 151     case AFMT_S8:
 152         *endianness =0;
 153         *fmt = AUD_FMT_S8;
 154         break;
 155
 156     case AFMT_U8:
 157         *endianness = 0;
 158         *fmt = AUD_FMT_U8;
 159         break;
 160
 161     case AFMT_S16_LE:
 162         *endianness = 0;
 163         *fmt = AUD_FMT_S16;
 164         break;
 165
 166     case AFMT_U16_LE:
 167         *endianness = 0;
 168         *fmt = AUD_FMT_U16;
 169         break;
 170
 171     case AFMT_S16_BE:
 172         *endianness = 1;
 173         *fmt = AUD_FMT_S16;
 174         break;
 175
 176     case AFMT_U16_BE:
 177         *endianness = 1;
 178         *fmt = AUD_FMT_U16;
 179         break;
 180
 181     default:
 182         dolog ("Unrecognized audio format %d\n", ossfmt);
 183         return -1;
 184     }
 185
 186     return 0;
 187 }
 188
 189 #if defined DEBUG_MISMATCHES || defined DEBUG
 190 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 191 {
 192     dolog ("parameter | requested value | obtained value\n");
 193     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 194     dolog ("channels  |      %10d |     %10d\n",
 195            req->nchannels, obt->nchannels);
 196     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 197     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 198     dolog ("fragsize  |      %10d |     %10d\n",
 199            req->fragsize, obt->fragsize);
 200 }
 201 #endif
 202
 203 static int oss_open (int in, struct oss_params *req,
 204                      struct oss_params *obt, int *pfd)
 205 {
 206     int fd;
 207     int mmmmssss;
 208     audio_buf_info abinfo;
 209     int fmt, freq, nchannels;
 210     const char *dspname = in ? conf.devpath_in : conf.devpath_out;
 211     const char *typ = in ? "ADC" : "DAC";
 212
 213     fd = open (dspname, (in ? O_RDONLY : O_WRONLY) | O_NONBLOCK);
 214     if (-1 == fd) {
 215         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 216         return -1;
 217     }
 218
 219     freq = req->freq;
 220     nchannels = req->nchannels;
 221     fmt = req->fmt;
 222
 223     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 224         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 225         goto err;
 226     }
 227
 228     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 229         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 230                      req->nchannels);
 231         goto err;
 232     }
 233
 234     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 235         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 236         goto err;
 237     }
 238
 239     if (ioctl (fd, SNDCTL_DSP_NONBLOCK)) {
 240         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 241         goto err;
 242     }
 243
 244     mmmmssss = (req->nfrags << 16) | lsbindex (req->fragsize);
 245     if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 246         oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 247                      req->nfrags, req->fragsize);
 248         goto err;
 249     }
 250
 251     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 252         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 253         goto err;
 254     }
 255
 256     obt->fmt = fmt;
 257     obt->nchannels = nchannels;
 258     obt->freq = freq;
 259     obt->nfrags = abinfo.fragstotal;
 260     obt->fragsize = abinfo.fragsize;
 261     *pfd = fd;
 262
 263 #ifdef DEBUG_MISMATCHES
 264     if ((req->fmt != obt->fmt) ||
 265         (req->nchannels != obt->nchannels) ||
 266         (req->freq != obt->freq) ||
 267         (req->fragsize != obt->fragsize) ||
 268         (req->nfrags != obt->nfrags)) {
 269         dolog ("Audio parameters mismatch\n");
 270         oss_dump_info (req, obt);
 271     }
 272 #endif
 273
 274 #ifdef DEBUG
 275     oss_dump_info (req, obt);
 276 #endif
 277     return 0;
 278
 279  err:
 280     oss_anal_close (&fd);
 281     return -1;
 282 }
 283
 284 static int oss_run_out (HWVoiceOut *hw)
 285 {
 286     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 287     int err, rpos, live, decr;
 288     int samples;
 289     uint8_t *dst;
 290     st_sample_t *src;
 291     struct audio_buf_info abinfo;
 292     struct count_info cntinfo;
 293     int bufsize;
 294
 295     live = audio_pcm_hw_get_live_out (hw);
 296     if (!live) {
 297         return 0;
 298     }
 299
 300     bufsize = hw->samples << hw->info.shift;
 301
 302     if (oss->mmapped) {
 303         int bytes;
 304
 305         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 306         if (err < 0) {
 307             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 308             return 0;
 309         }
 310
 311         if (cntinfo.ptr == oss->old_optr) {
 312             if (abs (hw->samples - live) < 64) {
 313                 dolog ("warning: Overrun\n");
 314             }
 315             return 0;
 316         }
 317
 318         if (cntinfo.ptr > oss->old_optr) {
 319             bytes = cntinfo.ptr - oss->old_optr;
 320         }
 321         else {
 322             bytes = bufsize + cntinfo.ptr - oss->old_optr;
 323         }
 324
 325         decr = audio_MIN (bytes >> hw->info.shift, live);
 326     }
 327     else {
 328         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 329         if (err < 0) {
 330             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 331             return 0;
 332         }
 333
 334         if (abinfo.bytes > bufsize) {
 335             if (conf.debug) {
 336                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
 337                        "please report your OS/audio hw to malc@pulsesoft.com\n",
 338                        abinfo.bytes, bufsize);
 339             }
 340             abinfo.bytes = bufsize;
 341         }
 342
 343         if (abinfo.bytes < 0) {
 344             if (conf.debug) {
 345                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
 346                        abinfo.bytes, bufsize);
 347             }
 348             return 0;
 349         }
 350
 351         decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
 352         if (!decr) {
 353             return 0;
 354         }
 355     }
 356
 357     samples = decr;
 358     rpos = hw->rpos;
 359     while (samples) {
 360         int left_till_end_samples = hw->samples - rpos;
 361         int convert_samples = audio_MIN (samples, left_till_end_samples);
 362
 363         src = hw->mix_buf + rpos;
 364         dst = advance (oss->pcm_buf, rpos << hw->info.shift);
 365
 366         hw->clip (dst, src, convert_samples);
 367         if (!oss->mmapped) {
 368             int written;
 369
 370             written = write (oss->fd, dst, convert_samples << hw->info.shift);
 371             /* XXX: follow errno recommendations ? */
 372             if (written == -1) {
 373                 oss_logerr (
 374                     errno,
 375                     "Failed to write %d bytes of audio data from %p\n",
 376                     convert_samples << hw->info.shift,
 377                     dst
 378                     );
 379                 continue;
 380             }
 381
 382             if (written != convert_samples << hw->info.shift) {
 383                 int wsamples = written >> hw->info.shift;
 384                 int wbytes = wsamples << hw->info.shift;
 385                 if (wbytes != written) {
 386                     dolog ("warning: Misaligned write %d (requested %d), "
 387                            "alignment %d\n",
 388                            wbytes, written, hw->info.align + 1);
 389                 }
 390                 decr -= wsamples;
 391                 rpos = (rpos + wsamples) % hw->samples;
 392                 break;
 393             }
 394         }
 395
 396         rpos = (rpos + convert_samples) % hw->samples;
 397         samples -= convert_samples;
 398     }
 399     if (oss->mmapped) {
 400         oss->old_optr = cntinfo.ptr;
 401     }
 402
 403     hw->rpos = rpos;
 404     return decr;
 405 }
 406
 407 static void oss_fini_out (HWVoiceOut *hw)
 408 {
 409     int err;
 410     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 411
 412     ldebug ("oss_fini\n");
 413     oss_anal_close (&oss->fd);
 414
 415     if (oss->pcm_buf) {
 416         if (oss->mmapped) {
 417             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 418             if (err) {
 419                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 420                             oss->pcm_buf, hw->samples << hw->info.shift);
 421             }
 422         }
 423         else {
 424             qemu_free (oss->pcm_buf);
 425         }
 426         oss->pcm_buf = NULL;
 427     }
 428 }
 429
 430 static int oss_init_out (HWVoiceOut *hw, audsettings_t *as)
 431 {
 432     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 433     struct oss_params req, obt;
 434     int endianness;
 435     int err;
 436     int fd;
 437     audfmt_e effective_fmt;
 438     audsettings_t obt_as;
 439
 440     oss->fd = -1;
 441
 442     req.fmt = aud_to_ossfmt (as->fmt);
 443     req.freq = as->freq;
 444     req.nchannels = as->nchannels;
 445     req.fragsize = conf.fragsize;
 446     req.nfrags = conf.nfrags;
 447
 448     if (oss_open (0, &req, &obt, &fd)) {
 449         return -1;
 450     }
 451
 452     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 453     if (err) {
 454         oss_anal_close (&fd);
 455         return -1;
 456     }
 457
 458     obt_as.freq = obt.freq;
 459     obt_as.nchannels = obt.nchannels;
 460     obt_as.fmt = effective_fmt;
 461     obt_as.endianness = endianness;
 462
 463     audio_pcm_init_info (&hw->info, &obt_as);
 464     oss->nfrags = obt.nfrags;
 465     oss->fragsize = obt.fragsize;
 466
 467     if (obt.nfrags * obt.fragsize & hw->info.align) {
 468         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 469                obt.nfrags * obt.fragsize, hw->info.align + 1);
 470     }
 471
 472     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 473
 474     oss->mmapped = 0;
 475     if (conf.try_mmap) {
 476         oss->pcm_buf = mmap (
 477             0,
 478             hw->samples << hw->info.shift,
 479             PROT_READ | PROT_WRITE,
 480             MAP_SHARED,
 481             fd,
 482             0
 483             );
 484         if (oss->pcm_buf == MAP_FAILED) {
 485             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 486                         hw->samples << hw->info.shift);
 487         } else {
 488             int err;
 489             int trig = 0;
 490             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 491                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 492             }
 493             else {
 494                 trig = PCM_ENABLE_OUTPUT;
 495                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 496                     oss_logerr (
 497                         errno,
 498                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 499                         );
 500                 }
 501                 else {
 502                     oss->mmapped = 1;
 503                 }
 504             }
 505
 506             if (!oss->mmapped) {
 507                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 508                 if (err) {
 509                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 510                                 oss->pcm_buf, hw->samples << hw->info.shift);
 511                 }
 512             }
 513         }
 514     }
 515
 516     if (!oss->mmapped) {
 517         oss->pcm_buf = audio_calloc (
 518             AUDIO_FUNC,
 519             hw->samples,
 520             1 << hw->info.shift
 521             );
 522         if (!oss->pcm_buf) {
 523             dolog (
 524                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 525                 hw->samples,
 526                 1 << hw->info.shift
 527                 );
 528             oss_anal_close (&fd);
 529             return -1;
 530         }
 531     }
 532
 533     oss->fd = fd;
 534     return 0;
 535 }
 536
 537 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 538 {
 539     int trig;
 540     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 541
 542     if (!oss->mmapped) {
 543         return 0;
 544     }
 545
 546     switch (cmd) {
 547     case VOICE_ENABLE:
 548         ldebug ("enabling voice\n");
 549         audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 550         trig = PCM_ENABLE_OUTPUT;
 551         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 552             oss_logerr (
 553                 errno,
 554                 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 555                 );
 556             return -1;
 557         }
 558         break;
 559
 560     case VOICE_DISABLE:
 561         ldebug ("disabling voice\n");
 562         trig = 0;
 563         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 564             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 565             return -1;
 566         }
 567         break;
 568     }
 569     return 0;
 570 }
 571
 572 static int oss_init_in (HWVoiceIn *hw, audsettings_t *as)
 573 {
 574     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 575     struct oss_params req, obt;
 576     int endianness;
 577     int err;
 578     int fd;
 579     audfmt_e effective_fmt;
 580     audsettings_t obt_as;
 581
 582     oss->fd = -1;
 583
 584     req.fmt = aud_to_ossfmt (as->fmt);
 585     req.freq = as->freq;
 586     req.nchannels = as->nchannels;
 587     req.fragsize = conf.fragsize;
 588     req.nfrags = conf.nfrags;
 589     if (oss_open (1, &req, &obt, &fd)) {
 590         return -1;
 591     }
 592
 593     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 594     if (err) {
 595         oss_anal_close (&fd);
 596         return -1;
 597     }
 598
 599     obt_as.freq = obt.freq;
 600     obt_as.nchannels = obt.nchannels;
 601     obt_as.fmt = effective_fmt;
 602     obt_as.endianness = endianness;
 603
 604     audio_pcm_init_info (&hw->info, &obt_as);
 605     oss->nfrags = obt.nfrags;
 606     oss->fragsize = obt.fragsize;
 607
 608     if (obt.nfrags * obt.fragsize & hw->info.align) {
 609         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 610                obt.nfrags * obt.fragsize, hw->info.align + 1);
 611     }
 612
 613     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 614     oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 615     if (!oss->pcm_buf) {
 616         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 617                hw->samples, 1 << hw->info.shift);
 618         oss_anal_close (&fd);
 619         return -1;
 620     }
 621
 622     oss->fd = fd;
 623     return 0;
 624 }
 625
 626 static void oss_fini_in (HWVoiceIn *hw)
 627 {
 628     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 629
 630     oss_anal_close (&oss->fd);
 631
 632     if (oss->pcm_buf) {
 633         qemu_free (oss->pcm_buf);
 634         oss->pcm_buf = NULL;
 635     }
 636 }
 637
 638 static int oss_run_in (HWVoiceIn *hw)
 639 {
 640     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 641     int hwshift = hw->info.shift;
 642     int i;
 643     int live = audio_pcm_hw_get_live_in (hw);
 644     int dead = hw->samples - live;
 645     size_t read_samples = 0;
 646     struct {
 647         int add;
 648         int len;
 649     } bufs[2] = {
 650         { hw->wpos, 0 },
 651         { 0, 0 }
 652     };
 653
 654     if (!dead) {
 655         return 0;
 656     }
 657
 658     if (hw->wpos + dead > hw->samples) {
 659         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 660         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 661     }
 662     else {
 663         bufs[0].len = dead << hwshift;
 664     }
 665
 666
 667     for (i = 0; i < 2; ++i) {
 668         ssize_t nread;
 669
 670         if (bufs[i].len) {
 671             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 672             nread = read (oss->fd, p, bufs[i].len);
 673
 674             if (nread > 0) {
 675                 if (nread & hw->info.align) {
 676                     dolog ("warning: Misaligned read %zd (requested %d), "
 677                            "alignment %d\n", nread, bufs[i].add << hwshift,
 678                            hw->info.align + 1);
 679                 }
 680                 read_samples += nread >> hwshift;
 681                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
 682                           &nominal_volume);
 683             }
 684
 685             if (bufs[i].len - nread) {
 686                 if (nread == -1) {
 687                     switch (errno) {
 688                     case EINTR:
 689                     case EAGAIN:
 690                         break;
 691                     default:
 692                         oss_logerr (
 693                             errno,
 694                             "Failed to read %d bytes of audio (to %p)\n",
 695                             bufs[i].len, p
 696                             );
 697                         break;
 698                     }
 699                 }
 700                 break;
 701             }
 702         }
 703     }
 704
 705     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 706     return read_samples;
 707 }
 708
 709 static int oss_read (SWVoiceIn *sw, void *buf, int size)
 710 {
 711     return audio_pcm_sw_read (sw, buf, size);
 712 }
 713
 714 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 715 {
 716     (void) hw;
 717     (void) cmd;
 718     return 0;
 719 }
 720
 721 static void *oss_audio_init (void)
 722 {
 723     return &conf;
 724 }
 725
 726 static void oss_audio_fini (void *opaque)
 727 {
 728     (void) opaque;
 729 }
 730
 731 static struct audio_option oss_options[] = {
 732     {"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
 733      "Fragment size in bytes", NULL, 0},
 734     {"NFRAGS", AUD_OPT_INT, &conf.nfrags,
 735      "Number of fragments", NULL, 0},
 736     {"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
 737      "Try using memory mapped access", NULL, 0},
 738     {"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
 739      "Path to DAC device", NULL, 0},
 740     {"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
 741      "Path to ADC device", NULL, 0},
 742     {"DEBUG", AUD_OPT_BOOL, &conf.debug,
 743      "Turn on some debugging messages", NULL, 0},
 744     {NULL, 0, NULL, NULL, NULL, 0}
 745 };
 746
 747 static struct audio_pcm_ops oss_pcm_ops = {
 748     oss_init_out,
 749     oss_fini_out,
 750     oss_run_out,
 751     oss_write,
 752     oss_ctl_out,
 753
 754     oss_init_in,
 755     oss_fini_in,
 756     oss_run_in,
 757     oss_read,
 758     oss_ctl_in
 759 };
 760
 761 struct audio_driver oss_audio_driver = {
 762     INIT_FIELD (name           = ) "oss",
 763     INIT_FIELD (descr          = ) "OSS http://www.opensound.com",
 764     INIT_FIELD (options        = ) oss_options,
 765     INIT_FIELD (init           = ) oss_audio_init,
 766     INIT_FIELD (fini           = ) oss_audio_fini,
 767     INIT_FIELD (pcm_ops        = ) &oss_pcm_ops,
 768     INIT_FIELD (can_be_default = ) 1,
 769     INIT_FIELD (max_voices_out = ) INT_MAX,
 770     INIT_FIELD (max_voices_in  = ) INT_MAX,
 771     INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
 772     INIT_FIELD (voice_size_in  = ) sizeof (OSSVoiceIn)
 773 };