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 "qemu-common.h"
  34 #include "audio.h"
  35
  36 #define AUDIO_CAP "oss"
  37 #include "audio_int.h"
  38
  39 typedef struct OSSVoiceOut {
  40     HWVoiceOut hw;
  41     void *pcm_buf;
  42     int fd;
  43     int nfrags;
  44     int fragsize;
  45     int mmapped;
  46     int old_optr;
  47 } OSSVoiceOut;
  48
  49 typedef struct OSSVoiceIn {
  50     HWVoiceIn hw;
  51     void *pcm_buf;
  52     int fd;
  53     int nfrags;
  54     int fragsize;
  55     int old_optr;
  56 } OSSVoiceIn;
  57
  58 static struct {
  59     int try_mmap;
  60     int nfrags;
  61     int fragsize;
  62     const char *devpath_out;
  63     const char *devpath_in;
  64     int debug;
  65 } conf = {
  66     .try_mmap = 0,
  67     .nfrags = 4,
  68     .fragsize = 4096,
  69     .devpath_out = "/dev/dsp",
  70     .devpath_in = "/dev/dsp",
  71     .debug = 0
  72 };
  73
  74 struct oss_params {
  75     int freq;
  76     audfmt_e fmt;
  77     int nchannels;
  78     int nfrags;
  79     int fragsize;
  80 };
  81
  82 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
  83 {
  84     va_list ap;
  85
  86     va_start (ap, fmt);
  87     AUD_vlog (AUDIO_CAP, fmt, ap);
  88     va_end (ap);
  89
  90     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
  91 }
  92
  93 static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
  94     int err,
  95     const char *typ,
  96     const char *fmt,
  97     ...
  98     )
  99 {
 100     va_list ap;
 101
 102     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 103
 104     va_start (ap, fmt);
 105     AUD_vlog (AUDIO_CAP, fmt, ap);
 106     va_end (ap);
 107
 108     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
 109 }
 110
 111 static void oss_anal_close (int *fdp)
 112 {
 113     int err = close (*fdp);
 114     if (err) {
 115         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 116     }
 117     *fdp = -1;
 118 }
 119
 120 static int oss_write (SWVoiceOut *sw, void *buf, int len)
 121 {
 122     return audio_pcm_sw_write (sw, buf, len);
 123 }
 124
 125 static int aud_to_ossfmt (audfmt_e fmt)
 126 {
 127     switch (fmt) {
 128     case AUD_FMT_S8:
 129         return AFMT_S8;
 130
 131     case AUD_FMT_U8:
 132         return AFMT_U8;
 133
 134     case AUD_FMT_S16:
 135         return AFMT_S16_LE;
 136
 137     case AUD_FMT_U16:
 138         return AFMT_U16_LE;
 139
 140     default:
 141         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 142 #ifdef DEBUG_AUDIO
 143         abort ();
 144 #endif
 145         return AFMT_U8;
 146     }
 147 }
 148
 149 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
 150 {
 151     switch (ossfmt) {
 152     case AFMT_S8:
 153         *endianness = 0;
 154         *fmt = AUD_FMT_S8;
 155         break;
 156
 157     case AFMT_U8:
 158         *endianness = 0;
 159         *fmt = AUD_FMT_U8;
 160         break;
 161
 162     case AFMT_S16_LE:
 163         *endianness = 0;
 164         *fmt = AUD_FMT_S16;
 165         break;
 166
 167     case AFMT_U16_LE:
 168         *endianness = 0;
 169         *fmt = AUD_FMT_U16;
 170         break;
 171
 172     case AFMT_S16_BE:
 173         *endianness = 1;
 174         *fmt = AUD_FMT_S16;
 175         break;
 176
 177     case AFMT_U16_BE:
 178         *endianness = 1;
 179         *fmt = AUD_FMT_U16;
 180         break;
 181
 182     default:
 183         dolog ("Unrecognized audio format %d\n", ossfmt);
 184         return -1;
 185     }
 186
 187     return 0;
 188 }
 189
 190 #if defined DEBUG_MISMATCHES || defined DEBUG
 191 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 192 {
 193     dolog ("parameter | requested value | obtained value\n");
 194     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 195     dolog ("channels  |      %10d |     %10d\n",
 196            req->nchannels, obt->nchannels);
 197     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 198     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 199     dolog ("fragsize  |      %10d |     %10d\n",
 200            req->fragsize, obt->fragsize);
 201 }
 202 #endif
 203
 204 static int oss_open (int in, struct oss_params *req,
 205                      struct oss_params *obt, int *pfd)
 206 {
 207     int fd;
 208     int mmmmssss;
 209     audio_buf_info abinfo;
 210     int fmt, freq, nchannels;
 211     const char *dspname = in ? conf.devpath_in : conf.devpath_out;
 212     const char *typ = in ? "ADC" : "DAC";
 213
 214     fd = open (dspname, (in ? O_RDONLY : O_WRONLY) | O_NONBLOCK);
 215     if (-1 == fd) {
 216         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 217         return -1;
 218     }
 219
 220     freq = req->freq;
 221     nchannels = req->nchannels;
 222     fmt = req->fmt;
 223
 224     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 225         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 226         goto err;
 227     }
 228
 229     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 230         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 231                      req->nchannels);
 232         goto err;
 233     }
 234
 235     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 236         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 237         goto err;
 238     }
 239
 240     if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
 241         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 242         goto err;
 243     }
 244
 245     mmmmssss = (req->nfrags << 16) | lsbindex (req->fragsize);
 246     if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 247         oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 248                      req->nfrags, req->fragsize);
 249         goto err;
 250     }
 251
 252     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 253         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 254         goto err;
 255     }
 256
 257     if (!abinfo.fragstotal || !abinfo.fragsize) {
 258         AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
 259                  abinfo.fragstotal, abinfo.fragsize, typ);
 260         goto err;
 261     }
 262
 263     obt->fmt = fmt;
 264     obt->nchannels = nchannels;
 265     obt->freq = freq;
 266     obt->nfrags = abinfo.fragstotal;
 267     obt->fragsize = abinfo.fragsize;
 268     *pfd = fd;
 269
 270 #ifdef DEBUG_MISMATCHES
 271     if ((req->fmt != obt->fmt) ||
 272         (req->nchannels != obt->nchannels) ||
 273         (req->freq != obt->freq) ||
 274         (req->fragsize != obt->fragsize) ||
 275         (req->nfrags != obt->nfrags)) {
 276         dolog ("Audio parameters mismatch\n");
 277         oss_dump_info (req, obt);
 278     }
 279 #endif
 280
 281 #ifdef DEBUG
 282     oss_dump_info (req, obt);
 283 #endif
 284     return 0;
 285
 286  err:
 287     oss_anal_close (&fd);
 288     return -1;
 289 }
 290
 291 static int oss_run_out (HWVoiceOut *hw)
 292 {
 293     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 294     int err, rpos, live, decr;
 295     int samples;
 296     uint8_t *dst;
 297     struct st_sample *src;
 298     struct audio_buf_info abinfo;
 299     struct count_info cntinfo;
 300     int bufsize;
 301
 302     live = audio_pcm_hw_get_live_out (hw);
 303     if (!live) {
 304         return 0;
 305     }
 306
 307     bufsize = hw->samples << hw->info.shift;
 308
 309     if (oss->mmapped) {
 310         int bytes;
 311
 312         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 313         if (err < 0) {
 314             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 315             return 0;
 316         }
 317
 318         if (cntinfo.ptr == oss->old_optr) {
 319             if (abs (hw->samples - live) < 64) {
 320                 dolog ("warning: Overrun\n");
 321             }
 322             return 0;
 323         }
 324
 325         if (cntinfo.ptr > oss->old_optr) {
 326             bytes = cntinfo.ptr - oss->old_optr;
 327         }
 328         else {
 329             bytes = bufsize + cntinfo.ptr - oss->old_optr;
 330         }
 331
 332         decr = audio_MIN (bytes >> hw->info.shift, live);
 333     }
 334     else {
 335         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 336         if (err < 0) {
 337             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 338             return 0;
 339         }
 340
 341         if (abinfo.bytes > bufsize) {
 342             if (conf.debug) {
 343                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
 344                        "please report your OS/audio hw to malc@pulsesoft.com\n",
 345                        abinfo.bytes, bufsize);
 346             }
 347             abinfo.bytes = bufsize;
 348         }
 349
 350         if (abinfo.bytes < 0) {
 351             if (conf.debug) {
 352                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
 353                        abinfo.bytes, bufsize);
 354             }
 355             return 0;
 356         }
 357
 358         decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
 359         if (!decr) {
 360             return 0;
 361         }
 362     }
 363
 364     samples = decr;
 365     rpos = hw->rpos;
 366     while (samples) {
 367         int left_till_end_samples = hw->samples - rpos;
 368         int convert_samples = audio_MIN (samples, left_till_end_samples);
 369
 370         src = hw->mix_buf + rpos;
 371         dst = advance (oss->pcm_buf, rpos << hw->info.shift);
 372
 373         hw->clip (dst, src, convert_samples);
 374         if (!oss->mmapped) {
 375             int written;
 376
 377             written = write (oss->fd, dst, convert_samples << hw->info.shift);
 378             /* XXX: follow errno recommendations ? */
 379             if (written == -1) {
 380                 oss_logerr (
 381                     errno,
 382                     "Failed to write %d bytes of audio data from %p\n",
 383                     convert_samples << hw->info.shift,
 384                     dst
 385                     );
 386                 continue;
 387             }
 388
 389             if (written != convert_samples << hw->info.shift) {
 390                 int wsamples = written >> hw->info.shift;
 391                 int wbytes = wsamples << hw->info.shift;
 392                 if (wbytes != written) {
 393                     dolog ("warning: Misaligned write %d (requested %d), "
 394                            "alignment %d\n",
 395                            wbytes, written, hw->info.align + 1);
 396                 }
 397                 decr -= wsamples;
 398                 rpos = (rpos + wsamples) % hw->samples;
 399                 break;
 400             }
 401         }
 402
 403         rpos = (rpos + convert_samples) % hw->samples;
 404         samples -= convert_samples;
 405     }
 406     if (oss->mmapped) {
 407         oss->old_optr = cntinfo.ptr;
 408     }
 409
 410     hw->rpos = rpos;
 411     return decr;
 412 }
 413
 414 static void oss_fini_out (HWVoiceOut *hw)
 415 {
 416     int err;
 417     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 418
 419     ldebug ("oss_fini\n");
 420     oss_anal_close (&oss->fd);
 421
 422     if (oss->pcm_buf) {
 423         if (oss->mmapped) {
 424             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 425             if (err) {
 426                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 427                             oss->pcm_buf, hw->samples << hw->info.shift);
 428             }
 429         }
 430         else {
 431             qemu_free (oss->pcm_buf);
 432         }
 433         oss->pcm_buf = NULL;
 434     }
 435 }
 436
 437 static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)
 438 {
 439     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 440     struct oss_params req, obt;
 441     int endianness;
 442     int err;
 443     int fd;
 444     audfmt_e effective_fmt;
 445     struct audsettings obt_as;
 446
 447     oss->fd = -1;
 448
 449     req.fmt = aud_to_ossfmt (as->fmt);
 450     req.freq = as->freq;
 451     req.nchannels = as->nchannels;
 452     req.fragsize = conf.fragsize;
 453     req.nfrags = conf.nfrags;
 454
 455     if (oss_open (0, &req, &obt, &fd)) {
 456         return -1;
 457     }
 458
 459     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 460     if (err) {
 461         oss_anal_close (&fd);
 462         return -1;
 463     }
 464
 465     obt_as.freq = obt.freq;
 466     obt_as.nchannels = obt.nchannels;
 467     obt_as.fmt = effective_fmt;
 468     obt_as.endianness = endianness;
 469
 470     audio_pcm_init_info (&hw->info, &obt_as);
 471     oss->nfrags = obt.nfrags;
 472     oss->fragsize = obt.fragsize;
 473
 474     if (obt.nfrags * obt.fragsize & hw->info.align) {
 475         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 476                obt.nfrags * obt.fragsize, hw->info.align + 1);
 477     }
 478
 479     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 480
 481     oss->mmapped = 0;
 482     if (conf.try_mmap) {
 483         oss->pcm_buf = mmap (
 484             0,
 485             hw->samples << hw->info.shift,
 486             PROT_READ | PROT_WRITE,
 487             MAP_SHARED,
 488             fd,
 489             0
 490             );
 491         if (oss->pcm_buf == MAP_FAILED) {
 492             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 493                         hw->samples << hw->info.shift);
 494         } else {
 495             int err;
 496             int trig = 0;
 497             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 498                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 499             }
 500             else {
 501                 trig = PCM_ENABLE_OUTPUT;
 502                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 503                     oss_logerr (
 504                         errno,
 505                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 506                         );
 507                 }
 508                 else {
 509                     oss->mmapped = 1;
 510                 }
 511             }
 512
 513             if (!oss->mmapped) {
 514                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 515                 if (err) {
 516                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 517                                 oss->pcm_buf, hw->samples << hw->info.shift);
 518                 }
 519             }
 520         }
 521     }
 522
 523     if (!oss->mmapped) {
 524         oss->pcm_buf = audio_calloc (
 525             AUDIO_FUNC,
 526             hw->samples,
 527             1 << hw->info.shift
 528             );
 529         if (!oss->pcm_buf) {
 530             dolog (
 531                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 532                 hw->samples,
 533                 1 << hw->info.shift
 534                 );
 535             oss_anal_close (&fd);
 536             return -1;
 537         }
 538     }
 539
 540     oss->fd = fd;
 541     return 0;
 542 }
 543
 544 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 545 {
 546     int trig;
 547     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 548
 549     if (!oss->mmapped) {
 550         return 0;
 551     }
 552
 553     switch (cmd) {
 554     case VOICE_ENABLE:
 555         ldebug ("enabling voice\n");
 556         audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 557         trig = PCM_ENABLE_OUTPUT;
 558         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 559             oss_logerr (
 560                 errno,
 561                 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 562                 );
 563             return -1;
 564         }
 565         break;
 566
 567     case VOICE_DISABLE:
 568         ldebug ("disabling voice\n");
 569         trig = 0;
 570         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 571             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 572             return -1;
 573         }
 574         break;
 575     }
 576     return 0;
 577 }
 578
 579 static int oss_init_in (HWVoiceIn *hw, struct audsettings *as)
 580 {
 581     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 582     struct oss_params req, obt;
 583     int endianness;
 584     int err;
 585     int fd;
 586     audfmt_e effective_fmt;
 587     struct audsettings obt_as;
 588
 589     oss->fd = -1;
 590
 591     req.fmt = aud_to_ossfmt (as->fmt);
 592     req.freq = as->freq;
 593     req.nchannels = as->nchannels;
 594     req.fragsize = conf.fragsize;
 595     req.nfrags = conf.nfrags;
 596     if (oss_open (1, &req, &obt, &fd)) {
 597         return -1;
 598     }
 599
 600     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 601     if (err) {
 602         oss_anal_close (&fd);
 603         return -1;
 604     }
 605
 606     obt_as.freq = obt.freq;
 607     obt_as.nchannels = obt.nchannels;
 608     obt_as.fmt = effective_fmt;
 609     obt_as.endianness = endianness;
 610
 611     audio_pcm_init_info (&hw->info, &obt_as);
 612     oss->nfrags = obt.nfrags;
 613     oss->fragsize = obt.fragsize;
 614
 615     if (obt.nfrags * obt.fragsize & hw->info.align) {
 616         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 617                obt.nfrags * obt.fragsize, hw->info.align + 1);
 618     }
 619
 620     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 621     oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 622     if (!oss->pcm_buf) {
 623         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 624                hw->samples, 1 << hw->info.shift);
 625         oss_anal_close (&fd);
 626         return -1;
 627     }
 628
 629     oss->fd = fd;
 630     return 0;
 631 }
 632
 633 static void oss_fini_in (HWVoiceIn *hw)
 634 {
 635     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 636
 637     oss_anal_close (&oss->fd);
 638
 639     if (oss->pcm_buf) {
 640         qemu_free (oss->pcm_buf);
 641         oss->pcm_buf = NULL;
 642     }
 643 }
 644
 645 static int oss_run_in (HWVoiceIn *hw)
 646 {
 647     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 648     int hwshift = hw->info.shift;
 649     int i;
 650     int live = audio_pcm_hw_get_live_in (hw);
 651     int dead = hw->samples - live;
 652     size_t read_samples = 0;
 653     struct {
 654         int add;
 655         int len;
 656     } bufs[2] = {
 657         { hw->wpos, 0 },
 658         { 0, 0 }
 659     };
 660
 661     if (!dead) {
 662         return 0;
 663     }
 664
 665     if (hw->wpos + dead > hw->samples) {
 666         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 667         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 668     }
 669     else {
 670         bufs[0].len = dead << hwshift;
 671     }
 672
 673
 674     for (i = 0; i < 2; ++i) {
 675         ssize_t nread;
 676
 677         if (bufs[i].len) {
 678             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 679             nread = read (oss->fd, p, bufs[i].len);
 680
 681             if (nread > 0) {
 682                 if (nread & hw->info.align) {
 683                     dolog ("warning: Misaligned read %zd (requested %d), "
 684                            "alignment %d\n", nread, bufs[i].add << hwshift,
 685                            hw->info.align + 1);
 686                 }
 687                 read_samples += nread >> hwshift;
 688                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
 689                           &nominal_volume);
 690             }
 691
 692             if (bufs[i].len - nread) {
 693                 if (nread == -1) {
 694                     switch (errno) {
 695                     case EINTR:
 696                     case EAGAIN:
 697                         break;
 698                     default:
 699                         oss_logerr (
 700                             errno,
 701                             "Failed to read %d bytes of audio (to %p)\n",
 702                             bufs[i].len, p
 703                             );
 704                         break;
 705                     }
 706                 }
 707                 break;
 708             }
 709         }
 710     }
 711
 712     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 713     return read_samples;
 714 }
 715
 716 static int oss_read (SWVoiceIn *sw, void *buf, int size)
 717 {
 718     return audio_pcm_sw_read (sw, buf, size);
 719 }
 720
 721 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 722 {
 723     (void) hw;
 724     (void) cmd;
 725     return 0;
 726 }
 727
 728 static void *oss_audio_init (void)
 729 {
 730     return &conf;
 731 }
 732
 733 static void oss_audio_fini (void *opaque)
 734 {
 735     (void) opaque;
 736 }
 737
 738 static struct audio_option oss_options[] = {
 739     {"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
 740      "Fragment size in bytes", NULL, 0},
 741     {"NFRAGS", AUD_OPT_INT, &conf.nfrags,
 742      "Number of fragments", NULL, 0},
 743     {"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
 744      "Try using memory mapped access", NULL, 0},
 745     {"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
 746      "Path to DAC device", NULL, 0},
 747     {"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
 748      "Path to ADC device", NULL, 0},
 749     {"DEBUG", AUD_OPT_BOOL, &conf.debug,
 750      "Turn on some debugging messages", NULL, 0},
 751     {NULL, 0, NULL, NULL, NULL, 0}
 752 };
 753
 754 static struct audio_pcm_ops oss_pcm_ops = {
 755     oss_init_out,
 756     oss_fini_out,
 757     oss_run_out,
 758     oss_write,
 759     oss_ctl_out,
 760
 761     oss_init_in,
 762     oss_fini_in,
 763     oss_run_in,
 764     oss_read,
 765     oss_ctl_in
 766 };
 767
 768 struct audio_driver oss_audio_driver = {
 769     INIT_FIELD (name           = ) "oss",
 770     INIT_FIELD (descr          = ) "OSS http://www.opensound.com",
 771     INIT_FIELD (options        = ) oss_options,
 772     INIT_FIELD (init           = ) oss_audio_init,
 773     INIT_FIELD (fini           = ) oss_audio_fini,
 774     INIT_FIELD (pcm_ops        = ) &oss_pcm_ops,
 775     INIT_FIELD (can_be_default = ) 1,
 776     INIT_FIELD (max_voices_out = ) INT_MAX,
 777     INIT_FIELD (max_voices_in  = ) INT_MAX,
 778     INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
 779     INIT_FIELD (voice_size_in  = ) sizeof (OSSVoiceIn)
 780 };