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