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)) {
 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     obt->fmt = fmt;
 258     obt->nchannels = nchannels;
 259     obt->freq = freq;
 260     obt->nfrags = abinfo.fragstotal;
 261     obt->fragsize = abinfo.fragsize;
 262     *pfd = fd;
 263
 264 #ifdef DEBUG_MISMATCHES
 265     if ((req->fmt != obt->fmt) ||
 266         (req->nchannels != obt->nchannels) ||
 267         (req->freq != obt->freq) ||
 268         (req->fragsize != obt->fragsize) ||
 269         (req->nfrags != obt->nfrags)) {
 270         dolog ("Audio parameters mismatch\n");
 271         oss_dump_info (req, obt);
 272     }
 273 #endif
 274
 275 #ifdef DEBUG
 276     oss_dump_info (req, obt);
 277 #endif
 278     return 0;
 279
 280  err:
 281     oss_anal_close (&fd);
 282     return -1;
 283 }
 284
 285 static int oss_run_out (HWVoiceOut *hw)
 286 {
 287     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 288     int err, rpos, live, decr;
 289     int samples;
 290     uint8_t *dst;
 291     st_sample_t *src;
 292     struct audio_buf_info abinfo;
 293     struct count_info cntinfo;
 294     int bufsize;
 295
 296     live = audio_pcm_hw_get_live_out (hw);
 297     if (!live) {
 298         return 0;
 299     }
 300
 301     bufsize = hw->samples << hw->info.shift;
 302
 303     if (oss->mmapped) {
 304         int bytes;
 305
 306         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 307         if (err < 0) {
 308             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 309             return 0;
 310         }
 311
 312         if (cntinfo.ptr == oss->old_optr) {
 313             if (abs (hw->samples - live) < 64) {
 314                 dolog ("warning: Overrun\n");
 315             }
 316             return 0;
 317         }
 318
 319         if (cntinfo.ptr > oss->old_optr) {
 320             bytes = cntinfo.ptr - oss->old_optr;
 321         }
 322         else {
 323             bytes = bufsize + cntinfo.ptr - oss->old_optr;
 324         }
 325
 326         decr = audio_MIN (bytes >> hw->info.shift, live);
 327     }
 328     else {
 329         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 330         if (err < 0) {
 331             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 332             return 0;
 333         }
 334
 335         if (abinfo.bytes > bufsize) {
 336             if (conf.debug) {
 337                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
 338                        "please report your OS/audio hw to malc@pulsesoft.com\n",
 339                        abinfo.bytes, bufsize);
 340             }
 341             abinfo.bytes = bufsize;
 342         }
 343
 344         if (abinfo.bytes < 0) {
 345             if (conf.debug) {
 346                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
 347                        abinfo.bytes, bufsize);
 348             }
 349             return 0;
 350         }
 351
 352         decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
 353         if (!decr) {
 354             return 0;
 355         }
 356     }
 357
 358     samples = decr;
 359     rpos = hw->rpos;
 360     while (samples) {
 361         int left_till_end_samples = hw->samples - rpos;
 362         int convert_samples = audio_MIN (samples, left_till_end_samples);
 363
 364         src = hw->mix_buf + rpos;
 365         dst = advance (oss->pcm_buf, rpos << hw->info.shift);
 366
 367         hw->clip (dst, src, convert_samples);
 368         if (!oss->mmapped) {
 369             int written;
 370
 371             written = write (oss->fd, dst, convert_samples << hw->info.shift);
 372             /* XXX: follow errno recommendations ? */
 373             if (written == -1) {
 374                 oss_logerr (
 375                     errno,
 376                     "Failed to write %d bytes of audio data from %p\n",
 377                     convert_samples << hw->info.shift,
 378                     dst
 379                     );
 380                 continue;
 381             }
 382
 383             if (written != convert_samples << hw->info.shift) {
 384                 int wsamples = written >> hw->info.shift;
 385                 int wbytes = wsamples << hw->info.shift;
 386                 if (wbytes != written) {
 387                     dolog ("warning: Misaligned write %d (requested %d), "
 388                            "alignment %d\n",
 389                            wbytes, written, hw->info.align + 1);
 390                 }
 391                 decr -= wsamples;
 392                 rpos = (rpos + wsamples) % hw->samples;
 393                 break;
 394             }
 395         }
 396
 397         rpos = (rpos + convert_samples) % hw->samples;
 398         samples -= convert_samples;
 399     }
 400     if (oss->mmapped) {
 401         oss->old_optr = cntinfo.ptr;
 402     }
 403
 404     hw->rpos = rpos;
 405     return decr;
 406 }
 407
 408 static void oss_fini_out (HWVoiceOut *hw)
 409 {
 410     int err;
 411     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 412
 413     ldebug ("oss_fini\n");
 414     oss_anal_close (&oss->fd);
 415
 416     if (oss->pcm_buf) {
 417         if (oss->mmapped) {
 418             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 419             if (err) {
 420                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 421                             oss->pcm_buf, hw->samples << hw->info.shift);
 422             }
 423         }
 424         else {
 425             qemu_free (oss->pcm_buf);
 426         }
 427         oss->pcm_buf = NULL;
 428     }
 429 }
 430
 431 static int oss_init_out (HWVoiceOut *hw, audsettings_t *as)
 432 {
 433     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 434     struct oss_params req, obt;
 435     int endianness;
 436     int err;
 437     int fd;
 438     audfmt_e effective_fmt;
 439     audsettings_t obt_as;
 440
 441     oss->fd = -1;
 442
 443     req.fmt = aud_to_ossfmt (as->fmt);
 444     req.freq = as->freq;
 445     req.nchannels = as->nchannels;
 446     req.fragsize = conf.fragsize;
 447     req.nfrags = conf.nfrags;
 448
 449     if (oss_open (0, &req, &obt, &fd)) {
 450         return -1;
 451     }
 452
 453     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 454     if (err) {
 455         oss_anal_close (&fd);
 456         return -1;
 457     }
 458
 459     obt_as.freq = obt.freq;
 460     obt_as.nchannels = obt.nchannels;
 461     obt_as.fmt = effective_fmt;
 462     obt_as.endianness = endianness;
 463
 464     audio_pcm_init_info (&hw->info, &obt_as);
 465     oss->nfrags = obt.nfrags;
 466     oss->fragsize = obt.fragsize;
 467
 468     if (obt.nfrags * obt.fragsize & hw->info.align) {
 469         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 470                obt.nfrags * obt.fragsize, hw->info.align + 1);
 471     }
 472
 473     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 474
 475     oss->mmapped = 0;
 476     if (conf.try_mmap) {
 477         oss->pcm_buf = mmap (
 478             0,
 479             hw->samples << hw->info.shift,
 480             PROT_READ | PROT_WRITE,
 481             MAP_SHARED,
 482             fd,
 483             0
 484             );
 485         if (oss->pcm_buf == MAP_FAILED) {
 486             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 487                         hw->samples << hw->info.shift);
 488         } else {
 489             int err;
 490             int trig = 0;
 491             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 492                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 493             }
 494             else {
 495                 trig = PCM_ENABLE_OUTPUT;
 496                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 497                     oss_logerr (
 498                         errno,
 499                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 500                         );
 501                 }
 502                 else {
 503                     oss->mmapped = 1;
 504                 }
 505             }
 506
 507             if (!oss->mmapped) {
 508                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 509                 if (err) {
 510                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 511                                 oss->pcm_buf, hw->samples << hw->info.shift);
 512                 }
 513             }
 514         }
 515     }
 516
 517     if (!oss->mmapped) {
 518         oss->pcm_buf = audio_calloc (
 519             AUDIO_FUNC,
 520             hw->samples,
 521             1 << hw->info.shift
 522             );
 523         if (!oss->pcm_buf) {
 524             dolog (
 525                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 526                 hw->samples,
 527                 1 << hw->info.shift
 528                 );
 529             oss_anal_close (&fd);
 530             return -1;
 531         }
 532     }
 533
 534     oss->fd = fd;
 535     return 0;
 536 }
 537
 538 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 539 {
 540     int trig;
 541     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 542
 543     if (!oss->mmapped) {
 544         return 0;
 545     }
 546
 547     switch (cmd) {
 548     case VOICE_ENABLE:
 549         ldebug ("enabling voice\n");
 550         audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 551         trig = PCM_ENABLE_OUTPUT;
 552         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 553             oss_logerr (
 554                 errno,
 555                 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 556                 );
 557             return -1;
 558         }
 559         break;
 560
 561     case VOICE_DISABLE:
 562         ldebug ("disabling voice\n");
 563         trig = 0;
 564         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 565             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 566             return -1;
 567         }
 568         break;
 569     }
 570     return 0;
 571 }
 572
 573 static int oss_init_in (HWVoiceIn *hw, audsettings_t *as)
 574 {
 575     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 576     struct oss_params req, obt;
 577     int endianness;
 578     int err;
 579     int fd;
 580     audfmt_e effective_fmt;
 581     audsettings_t obt_as;
 582
 583     oss->fd = -1;
 584
 585     req.fmt = aud_to_ossfmt (as->fmt);
 586     req.freq = as->freq;
 587     req.nchannels = as->nchannels;
 588     req.fragsize = conf.fragsize;
 589     req.nfrags = conf.nfrags;
 590     if (oss_open (1, &req, &obt, &fd)) {
 591         return -1;
 592     }
 593
 594     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 595     if (err) {
 596         oss_anal_close (&fd);
 597         return -1;
 598     }
 599
 600     obt_as.freq = obt.freq;
 601     obt_as.nchannels = obt.nchannels;
 602     obt_as.fmt = effective_fmt;
 603     obt_as.endianness = endianness;
 604
 605     audio_pcm_init_info (&hw->info, &obt_as);
 606     oss->nfrags = obt.nfrags;
 607     oss->fragsize = obt.fragsize;
 608
 609     if (obt.nfrags * obt.fragsize & hw->info.align) {
 610         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 611                obt.nfrags * obt.fragsize, hw->info.align + 1);
 612     }
 613
 614     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 615     oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 616     if (!oss->pcm_buf) {
 617         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 618                hw->samples, 1 << hw->info.shift);
 619         oss_anal_close (&fd);
 620         return -1;
 621     }
 622
 623     oss->fd = fd;
 624     return 0;
 625 }
 626
 627 static void oss_fini_in (HWVoiceIn *hw)
 628 {
 629     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 630
 631     oss_anal_close (&oss->fd);
 632
 633     if (oss->pcm_buf) {
 634         qemu_free (oss->pcm_buf);
 635         oss->pcm_buf = NULL;
 636     }
 637 }
 638
 639 static int oss_run_in (HWVoiceIn *hw)
 640 {
 641     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 642     int hwshift = hw->info.shift;
 643     int i;
 644     int live = audio_pcm_hw_get_live_in (hw);
 645     int dead = hw->samples - live;
 646     size_t read_samples = 0;
 647     struct {
 648         int add;
 649         int len;
 650     } bufs[2] = {
 651         { hw->wpos, 0 },
 652         { 0, 0 }
 653     };
 654
 655     if (!dead) {
 656         return 0;
 657     }
 658
 659     if (hw->wpos + dead > hw->samples) {
 660         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 661         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 662     }
 663     else {
 664         bufs[0].len = dead << hwshift;
 665     }
 666
 667
 668     for (i = 0; i < 2; ++i) {
 669         ssize_t nread;
 670
 671         if (bufs[i].len) {
 672             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 673             nread = read (oss->fd, p, bufs[i].len);
 674
 675             if (nread > 0) {
 676                 if (nread & hw->info.align) {
 677                     dolog ("warning: Misaligned read %zd (requested %d), "
 678                            "alignment %d\n", nread, bufs[i].add << hwshift,
 679                            hw->info.align + 1);
 680                 }
 681                 read_samples += nread >> hwshift;
 682                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
 683                           &nominal_volume);
 684             }
 685
 686             if (bufs[i].len - nread) {
 687                 if (nread == -1) {
 688                     switch (errno) {
 689                     case EINTR:
 690                     case EAGAIN:
 691                         break;
 692                     default:
 693                         oss_logerr (
 694                             errno,
 695                             "Failed to read %d bytes of audio (to %p)\n",
 696                             bufs[i].len, p
 697                             );
 698                         break;
 699                     }
 700                 }
 701                 break;
 702             }
 703         }
 704     }
 705
 706     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 707     return read_samples;
 708 }
 709
 710 static int oss_read (SWVoiceIn *sw, void *buf, int size)
 711 {
 712     return audio_pcm_sw_read (sw, buf, size);
 713 }
 714
 715 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 716 {
 717     (void) hw;
 718     (void) cmd;
 719     return 0;
 720 }
 721
 722 static void *oss_audio_init (void)
 723 {
 724     return &conf;
 725 }
 726
 727 static void oss_audio_fini (void *opaque)
 728 {
 729     (void) opaque;
 730 }
 731
 732 static struct audio_option oss_options[] = {
 733     {"FRAGSIZE", AUD_OPT_INT, &conf.fragsize,
 734      "Fragment size in bytes", NULL, 0},
 735     {"NFRAGS", AUD_OPT_INT, &conf.nfrags,
 736      "Number of fragments", NULL, 0},
 737     {"MMAP", AUD_OPT_BOOL, &conf.try_mmap,
 738      "Try using memory mapped access", NULL, 0},
 739     {"DAC_DEV", AUD_OPT_STR, &conf.devpath_out,
 740      "Path to DAC device", NULL, 0},
 741     {"ADC_DEV", AUD_OPT_STR, &conf.devpath_in,
 742      "Path to ADC device", NULL, 0},
 743     {"DEBUG", AUD_OPT_BOOL, &conf.debug,
 744      "Turn on some debugging messages", NULL, 0},
 745     {NULL, 0, NULL, NULL, NULL, 0}
 746 };
 747
 748 static struct audio_pcm_ops oss_pcm_ops = {
 749     oss_init_out,
 750     oss_fini_out,
 751     oss_run_out,
 752     oss_write,
 753     oss_ctl_out,
 754
 755     oss_init_in,
 756     oss_fini_in,
 757     oss_run_in,
 758     oss_read,
 759     oss_ctl_in
 760 };
 761
 762 struct audio_driver oss_audio_driver = {
 763     INIT_FIELD (name           = ) "oss",
 764     INIT_FIELD (descr          = ) "OSS http://www.opensound.com",
 765     INIT_FIELD (options        = ) oss_options,
 766     INIT_FIELD (init           = ) oss_audio_init,
 767     INIT_FIELD (fini           = ) oss_audio_fini,
 768     INIT_FIELD (pcm_ops        = ) &oss_pcm_ops,
 769     INIT_FIELD (can_be_default = ) 1,
 770     INIT_FIELD (max_voices_out = ) INT_MAX,
 771     INIT_FIELD (max_voices_in  = ) INT_MAX,
 772     INIT_FIELD (voice_size_out = ) sizeof (OSSVoiceOut),
 773     INIT_FIELD (voice_size_in  = ) sizeof (OSSVoiceIn)
 774 };