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 "host-utils.h"
  35 #include "qemu-char.h"
  36 #include "audio.h"
  37
  38 #define AUDIO_CAP "oss"
  39 #include "audio_int.h"
  40
  41 #if defined OSS_GETVERSION && defined SNDCTL_DSP_POLICY
  42 #define USE_DSP_POLICY
  43 #endif
  44
  45 typedef struct OSSVoiceOut {
  46     HWVoiceOut hw;
  47     void *pcm_buf;
  48     int fd;
  49     int wpos;
  50     int nfrags;
  51     int fragsize;
  52     int mmapped;
  53     int pending;
  54 } OSSVoiceOut;
  55
  56 typedef struct OSSVoiceIn {
  57     HWVoiceIn hw;
  58     void *pcm_buf;
  59     int fd;
  60     int nfrags;
  61     int fragsize;
  62 } OSSVoiceIn;
  63
  64 static struct {
  65     int try_mmap;
  66     int nfrags;
  67     int fragsize;
  68     const char *devpath_out;
  69     const char *devpath_in;
  70     int debug;
  71     int exclusive;
  72     int policy;
  73 } conf = {
  74     .try_mmap = 0,
  75     .nfrags = 4,
  76     .fragsize = 4096,
  77     .devpath_out = "/dev/dsp",
  78     .devpath_in = "/dev/dsp",
  79     .debug = 0,
  80     .exclusive = 0,
  81     .policy = 5
  82 };
  83
  84 struct oss_params {
  85     int freq;
  86     audfmt_e fmt;
  87     int nchannels;
  88     int nfrags;
  89     int fragsize;
  90 };
  91
  92 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
  93 {
  94     va_list ap;
  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 GCC_FMT_ATTR (3, 4) oss_logerr2 (
 104     int err,
 105     const char *typ,
 106     const char *fmt,
 107     ...
 108     )
 109 {
 110     va_list ap;
 111
 112     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 113
 114     va_start (ap, fmt);
 115     AUD_vlog (AUDIO_CAP, fmt, ap);
 116     va_end (ap);
 117
 118     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
 119 }
 120
 121 static void oss_anal_close (int *fdp)
 122 {
 123     int err;
 124
 125     qemu_set_fd_handler (*fdp, NULL, NULL, NULL);
 126     err = close (*fdp);
 127     if (err) {
 128         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 129     }
 130     *fdp = -1;
 131 }
 132
 133 static void oss_helper_poll_out (void *opaque)
 134 {
 135     (void) opaque;
 136     audio_run ("oss_poll_out");
 137 }
 138
 139 static void oss_helper_poll_in (void *opaque)
 140 {
 141     (void) opaque;
 142     audio_run ("oss_poll_in");
 143 }
 144
 145 static int oss_poll_out (HWVoiceOut *hw)
 146 {
 147     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 148
 149     return qemu_set_fd_handler (oss->fd, NULL, oss_helper_poll_out, NULL);
 150 }
 151
 152 static int oss_poll_in (HWVoiceIn *hw)
 153 {
 154     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 155
 156     return qemu_set_fd_handler (oss->fd, oss_helper_poll_in, NULL, NULL);
 157 }
 158
 159 static int oss_write (SWVoiceOut *sw, void *buf, int len)
 160 {
 161     return audio_pcm_sw_write (sw, buf, len);
 162 }
 163
 164 static int aud_to_ossfmt (audfmt_e fmt)
 165 {
 166     switch (fmt) {
 167     case AUD_FMT_S8:
 168         return AFMT_S8;
 169
 170     case AUD_FMT_U8:
 171         return AFMT_U8;
 172
 173     case AUD_FMT_S16:
 174         return AFMT_S16_LE;
 175
 176     case AUD_FMT_U16:
 177         return AFMT_U16_LE;
 178
 179     default:
 180         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 181 #ifdef DEBUG_AUDIO
 182         abort ();
 183 #endif
 184         return AFMT_U8;
 185     }
 186 }
 187
 188 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
 189 {
 190     switch (ossfmt) {
 191     case AFMT_S8:
 192         *endianness = 0;
 193         *fmt = AUD_FMT_S8;
 194         break;
 195
 196     case AFMT_U8:
 197         *endianness = 0;
 198         *fmt = AUD_FMT_U8;
 199         break;
 200
 201     case AFMT_S16_LE:
 202         *endianness = 0;
 203         *fmt = AUD_FMT_S16;
 204         break;
 205
 206     case AFMT_U16_LE:
 207         *endianness = 0;
 208         *fmt = AUD_FMT_U16;
 209         break;
 210
 211     case AFMT_S16_BE:
 212         *endianness = 1;
 213         *fmt = AUD_FMT_S16;
 214         break;
 215
 216     case AFMT_U16_BE:
 217         *endianness = 1;
 218         *fmt = AUD_FMT_U16;
 219         break;
 220
 221     default:
 222         dolog ("Unrecognized audio format %d\n", ossfmt);
 223         return -1;
 224     }
 225
 226     return 0;
 227 }
 228
 229 #if defined DEBUG_MISMATCHES || defined DEBUG
 230 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 231 {
 232     dolog ("parameter | requested value | obtained value\n");
 233     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 234     dolog ("channels  |      %10d |     %10d\n",
 235            req->nchannels, obt->nchannels);
 236     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 237     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 238     dolog ("fragsize  |      %10d |     %10d\n",
 239            req->fragsize, obt->fragsize);
 240 }
 241 #endif
 242
 243 #ifdef USE_DSP_POLICY
 244 static int oss_get_version (int fd, int *version, const char *typ)
 245 {
 246     if (ioctl (fd, OSS_GETVERSION, &version)) {
 247 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 248         /*
 249          * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION
 250          * since 7.x, but currently only on the mixer device (or in
 251          * the Linuxolator), and in the native version that part of
 252          * the code is in fact never reached so the ioctl fails anyway.
 253          * Until this is fixed, just check the errno and if its what
 254          * FreeBSD's sound drivers return atm assume they are new enough.
 255          */
 256         if (errno == EINVAL) {
 257             *version = 0x040000;
 258             return 0;
 259         }
 260 #endif
 261         oss_logerr2 (errno, typ, "Failed to get OSS version\n");
 262         return -1;
 263     }
 264     return 0;
 265 }
 266 #endif
 267
 268 static int oss_open (int in, struct oss_params *req,
 269                      struct oss_params *obt, int *pfd)
 270 {
 271     int fd;
 272     int oflags = conf.exclusive ? O_EXCL : 0;
 273     audio_buf_info abinfo;
 274     int fmt, freq, nchannels;
 275     int setfragment = 1;
 276     const char *dspname = in ? conf.devpath_in : conf.devpath_out;
 277     const char *typ = in ? "ADC" : "DAC";
 278
 279     /* Kludge needed to have working mmap on Linux */
 280     oflags |= conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);
 281
 282     fd = open (dspname, oflags | O_NONBLOCK);
 283     if (-1 == fd) {
 284         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 285         return -1;
 286     }
 287
 288     freq = req->freq;
 289     nchannels = req->nchannels;
 290     fmt = req->fmt;
 291
 292     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 293         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 294         goto err;
 295     }
 296
 297     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 298         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 299                      req->nchannels);
 300         goto err;
 301     }
 302
 303     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 304         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 305         goto err;
 306     }
 307
 308     if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
 309         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 310         goto err;
 311     }
 312
 313 #ifdef USE_DSP_POLICY
 314     if (conf.policy >= 0) {
 315         int version;
 316
 317         if (!oss_get_version (fd, &version, typ)) {
 318             if (conf.debug) {
 319                 dolog ("OSS version = %#x\n", version);
 320             }
 321
 322             if (version >= 0x040000) {
 323                 int policy = conf.policy;
 324                 if (ioctl (fd, SNDCTL_DSP_POLICY, &policy)) {
 325                     oss_logerr2 (errno, typ,
 326                                  "Failed to set timing policy to %d\n",
 327                                  conf.policy);
 328                     goto err;
 329                 }
 330                 setfragment = 0;
 331             }
 332         }
 333     }
 334 #endif
 335
 336     if (setfragment) {
 337         int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
 338         if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 339             oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 340                          req->nfrags, req->fragsize);
 341             goto err;
 342         }
 343     }
 344
 345     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 346         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 347         goto err;
 348     }
 349
 350     if (!abinfo.fragstotal || !abinfo.fragsize) {
 351         AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
 352                  abinfo.fragstotal, abinfo.fragsize, typ);
 353         goto err;
 354     }
 355
 356     obt->fmt = fmt;
 357     obt->nchannels = nchannels;
 358     obt->freq = freq;
 359     obt->nfrags = abinfo.fragstotal;
 360     obt->fragsize = abinfo.fragsize;
 361     *pfd = fd;
 362
 363 #ifdef DEBUG_MISMATCHES
 364     if ((req->fmt != obt->fmt) ||
 365         (req->nchannels != obt->nchannels) ||
 366         (req->freq != obt->freq) ||
 367         (req->fragsize != obt->fragsize) ||
 368         (req->nfrags != obt->nfrags)) {
 369         dolog ("Audio parameters mismatch\n");
 370         oss_dump_info (req, obt);
 371     }
 372 #endif
 373
 374 #ifdef DEBUG
 375     oss_dump_info (req, obt);
 376 #endif
 377     return 0;
 378
 379  err:
 380     oss_anal_close (&fd);
 381     return -1;
 382 }
 383
 384 static void oss_write_pending (OSSVoiceOut *oss)
 385 {
 386     HWVoiceOut *hw = &oss->hw;
 387
 388     if (oss->mmapped) {
 389         return;
 390     }
 391
 392     while (oss->pending) {
 393         int samples_written;
 394         ssize_t bytes_written;
 395         int samples_till_end = hw->samples - oss->wpos;
 396         int samples_to_write = audio_MIN (oss->pending, samples_till_end);
 397         int bytes_to_write = samples_to_write << hw->info.shift;
 398         void *pcm = advance (oss->pcm_buf, oss->wpos << hw->info.shift);
 399
 400         bytes_written = write (oss->fd, pcm, bytes_to_write);
 401         if (bytes_written < 0) {
 402             if (errno != EAGAIN) {
 403                 oss_logerr (errno, "failed to write %d bytes\n",
 404                             bytes_to_write);
 405             }
 406             break;
 407         }
 408
 409         if (bytes_written & hw->info.align) {
 410             dolog ("misaligned write asked for %d, but got %zd\n",
 411                    bytes_to_write, bytes_written);
 412             return;
 413         }
 414
 415         samples_written = bytes_written >> hw->info.shift;
 416         oss->pending -= samples_written;
 417         oss->wpos = (oss->wpos + samples_written) % hw->samples;
 418         if (bytes_written - bytes_to_write) {
 419             break;
 420         }
 421     }
 422 }
 423
 424 static int oss_run_out (HWVoiceOut *hw, int live)
 425 {
 426     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 427     int err, decr;
 428     struct audio_buf_info abinfo;
 429     struct count_info cntinfo;
 430     int bufsize;
 431
 432     bufsize = hw->samples << hw->info.shift;
 433
 434     if (oss->mmapped) {
 435         int bytes, pos;
 436
 437         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 438         if (err < 0) {
 439             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 440             return 0;
 441         }
 442
 443         pos = hw->rpos << hw->info.shift;
 444         bytes = audio_ring_dist (cntinfo.ptr, pos, bufsize);
 445         decr = audio_MIN (bytes >> hw->info.shift, live);
 446     }
 447     else {
 448         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 449         if (err < 0) {
 450             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 451             return 0;
 452         }
 453
 454         if (abinfo.bytes > bufsize) {
 455             if (conf.debug) {
 456                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
 457                        "please report your OS/audio hw to av1474@comtv.ru\n",
 458                        abinfo.bytes, bufsize);
 459             }
 460             abinfo.bytes = bufsize;
 461         }
 462
 463         if (abinfo.bytes < 0) {
 464             if (conf.debug) {
 465                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
 466                        abinfo.bytes, bufsize);
 467             }
 468             return 0;
 469         }
 470
 471         decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
 472         if (!decr) {
 473             return 0;
 474         }
 475     }
 476
 477     decr = audio_pcm_hw_clip_out (hw, oss->pcm_buf, decr, oss->pending);
 478     oss->pending += decr;
 479     oss_write_pending (oss);
 480
 481     return decr;
 482 }
 483
 484 static void oss_fini_out (HWVoiceOut *hw)
 485 {
 486     int err;
 487     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 488
 489     ldebug ("oss_fini\n");
 490     oss_anal_close (&oss->fd);
 491
 492     if (oss->pcm_buf) {
 493         if (oss->mmapped) {
 494             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 495             if (err) {
 496                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 497                             oss->pcm_buf, hw->samples << hw->info.shift);
 498             }
 499         }
 500         else {
 501             qemu_free (oss->pcm_buf);
 502         }
 503         oss->pcm_buf = NULL;
 504     }
 505 }
 506
 507 static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)
 508 {
 509     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 510     struct oss_params req, obt;
 511     int endianness;
 512     int err;
 513     int fd;
 514     audfmt_e effective_fmt;
 515     struct audsettings obt_as;
 516
 517     oss->fd = -1;
 518
 519     req.fmt = aud_to_ossfmt (as->fmt);
 520     req.freq = as->freq;
 521     req.nchannels = as->nchannels;
 522     req.fragsize = conf.fragsize;
 523     req.nfrags = conf.nfrags;
 524
 525     if (oss_open (0, &req, &obt, &fd)) {
 526         return -1;
 527     }
 528
 529     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 530     if (err) {
 531         oss_anal_close (&fd);
 532         return -1;
 533     }
 534
 535     obt_as.freq = obt.freq;
 536     obt_as.nchannels = obt.nchannels;
 537     obt_as.fmt = effective_fmt;
 538     obt_as.endianness = endianness;
 539
 540     audio_pcm_init_info (&hw->info, &obt_as);
 541     oss->nfrags = obt.nfrags;
 542     oss->fragsize = obt.fragsize;
 543
 544     if (obt.nfrags * obt.fragsize & hw->info.align) {
 545         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 546                obt.nfrags * obt.fragsize, hw->info.align + 1);
 547     }
 548
 549     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 550
 551     oss->mmapped = 0;
 552     if (conf.try_mmap) {
 553         oss->pcm_buf = mmap (
 554             NULL,
 555             hw->samples << hw->info.shift,
 556             PROT_READ | PROT_WRITE,
 557             MAP_SHARED,
 558             fd,
 559             0
 560             );
 561         if (oss->pcm_buf == MAP_FAILED) {
 562             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 563                         hw->samples << hw->info.shift);
 564         }
 565         else {
 566             int err;
 567             int trig = 0;
 568             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 569                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 570             }
 571             else {
 572                 trig = PCM_ENABLE_OUTPUT;
 573                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 574                     oss_logerr (
 575                         errno,
 576                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 577                         );
 578                 }
 579                 else {
 580                     oss->mmapped = 1;
 581                 }
 582             }
 583
 584             if (!oss->mmapped) {
 585                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 586                 if (err) {
 587                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 588                                 oss->pcm_buf, hw->samples << hw->info.shift);
 589                 }
 590             }
 591         }
 592     }
 593
 594     if (!oss->mmapped) {
 595         oss->pcm_buf = audio_calloc (
 596             AUDIO_FUNC,
 597             hw->samples,
 598             1 << hw->info.shift
 599             );
 600         if (!oss->pcm_buf) {
 601             dolog (
 602                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 603                 hw->samples,
 604                 1 << hw->info.shift
 605                 );
 606             oss_anal_close (&fd);
 607             return -1;
 608         }
 609     }
 610
 611     oss->fd = fd;
 612     return 0;
 613 }
 614
 615 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 616 {
 617     int trig;
 618     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 619
 620     switch (cmd) {
 621     case VOICE_ENABLE:
 622         {
 623             va_list ap;
 624             int poll_mode;
 625
 626             va_start (ap, cmd);
 627             poll_mode = va_arg (ap, int);
 628             va_end (ap);
 629
 630             ldebug ("enabling voice\n");
 631             if (poll_mode && oss_poll_out (hw)) {
 632                 poll_mode = 0;
 633             }
 634             hw->poll_mode = poll_mode;
 635
 636             if (!oss->mmapped) {
 637                 return 0;
 638             }
 639
 640             audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 641             trig = PCM_ENABLE_OUTPUT;
 642             if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 643                 oss_logerr (
 644                     errno,
 645                     "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 646                     );
 647                 return -1;
 648             }
 649         }
 650         break;
 651
 652     case VOICE_DISABLE:
 653         if (hw->poll_mode) {
 654             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 655             hw->poll_mode = 0;
 656         }
 657
 658         if (!oss->mmapped) {
 659             return 0;
 660         }
 661
 662         ldebug ("disabling voice\n");
 663         trig = 0;
 664         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 665             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 666             return -1;
 667         }
 668         break;
 669     }
 670     return 0;
 671 }
 672
 673 static int oss_init_in (HWVoiceIn *hw, struct audsettings *as)
 674 {
 675     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 676     struct oss_params req, obt;
 677     int endianness;
 678     int err;
 679     int fd;
 680     audfmt_e effective_fmt;
 681     struct audsettings obt_as;
 682
 683     oss->fd = -1;
 684
 685     req.fmt = aud_to_ossfmt (as->fmt);
 686     req.freq = as->freq;
 687     req.nchannels = as->nchannels;
 688     req.fragsize = conf.fragsize;
 689     req.nfrags = conf.nfrags;
 690     if (oss_open (1, &req, &obt, &fd)) {
 691         return -1;
 692     }
 693
 694     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 695     if (err) {
 696         oss_anal_close (&fd);
 697         return -1;
 698     }
 699
 700     obt_as.freq = obt.freq;
 701     obt_as.nchannels = obt.nchannels;
 702     obt_as.fmt = effective_fmt;
 703     obt_as.endianness = endianness;
 704
 705     audio_pcm_init_info (&hw->info, &obt_as);
 706     oss->nfrags = obt.nfrags;
 707     oss->fragsize = obt.fragsize;
 708
 709     if (obt.nfrags * obt.fragsize & hw->info.align) {
 710         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 711                obt.nfrags * obt.fragsize, hw->info.align + 1);
 712     }
 713
 714     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 715     oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 716     if (!oss->pcm_buf) {
 717         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 718                hw->samples, 1 << hw->info.shift);
 719         oss_anal_close (&fd);
 720         return -1;
 721     }
 722
 723     oss->fd = fd;
 724     return 0;
 725 }
 726
 727 static void oss_fini_in (HWVoiceIn *hw)
 728 {
 729     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 730
 731     oss_anal_close (&oss->fd);
 732
 733     if (oss->pcm_buf) {
 734         qemu_free (oss->pcm_buf);
 735         oss->pcm_buf = NULL;
 736     }
 737 }
 738
 739 static int oss_run_in (HWVoiceIn *hw)
 740 {
 741     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 742     int hwshift = hw->info.shift;
 743     int i;
 744     int live = audio_pcm_hw_get_live_in (hw);
 745     int dead = hw->samples - live;
 746     size_t read_samples = 0;
 747     struct {
 748         int add;
 749         int len;
 750     } bufs[2] = {
 751         { .add = hw->wpos, .len = 0 },
 752         { .add = 0,        .len = 0 }
 753     };
 754
 755     if (!dead) {
 756         return 0;
 757     }
 758
 759     if (hw->wpos + dead > hw->samples) {
 760         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 761         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 762     }
 763     else {
 764         bufs[0].len = dead << hwshift;
 765     }
 766
 767     for (i = 0; i < 2; ++i) {
 768         ssize_t nread;
 769
 770         if (bufs[i].len) {
 771             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 772             nread = read (oss->fd, p, bufs[i].len);
 773
 774             if (nread > 0) {
 775                 if (nread & hw->info.align) {
 776                     dolog ("warning: Misaligned read %zd (requested %d), "
 777                            "alignment %d\n", nread, bufs[i].add << hwshift,
 778                            hw->info.align + 1);
 779                 }
 780                 read_samples += nread >> hwshift;
 781                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
 782                           &nominal_volume);
 783             }
 784
 785             if (bufs[i].len - nread) {
 786                 if (nread == -1) {
 787                     switch (errno) {
 788                     case EINTR:
 789                     case EAGAIN:
 790                         break;
 791                     default:
 792                         oss_logerr (
 793                             errno,
 794                             "Failed to read %d bytes of audio (to %p)\n",
 795                             bufs[i].len, p
 796                             );
 797                         break;
 798                     }
 799                 }
 800                 break;
 801             }
 802         }
 803     }
 804
 805     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 806     return read_samples;
 807 }
 808
 809 static int oss_read (SWVoiceIn *sw, void *buf, int size)
 810 {
 811     return audio_pcm_sw_read (sw, buf, size);
 812 }
 813
 814 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 815 {
 816     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 817
 818     switch (cmd) {
 819     case VOICE_ENABLE:
 820         {
 821             va_list ap;
 822             int poll_mode;
 823
 824             va_start (ap, cmd);
 825             poll_mode = va_arg (ap, int);
 826             va_end (ap);
 827
 828             if (poll_mode && oss_poll_in (hw)) {
 829                 poll_mode = 0;
 830             }
 831             hw->poll_mode = poll_mode;
 832         }
 833         break;
 834
 835     case VOICE_DISABLE:
 836         if (hw->poll_mode) {
 837             hw->poll_mode = 0;
 838             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 839         }
 840         break;
 841     }
 842     return 0;
 843 }
 844
 845 static void *oss_audio_init (void)
 846 {
 847     return &conf;
 848 }
 849
 850 static void oss_audio_fini (void *opaque)
 851 {
 852     (void) opaque;
 853 }
 854
 855 static struct audio_option oss_options[] = {
 856     {
 857         .name  = "FRAGSIZE",
 858         .tag   = AUD_OPT_INT,
 859         .valp  = &conf.fragsize,
 860         .descr = "Fragment size in bytes"
 861     },
 862     {
 863         .name  = "NFRAGS",
 864         .tag   = AUD_OPT_INT,
 865         .valp  = &conf.nfrags,
 866         .descr = "Number of fragments"
 867     },
 868     {
 869         .name  = "MMAP",
 870         .tag   = AUD_OPT_BOOL,
 871         .valp  = &conf.try_mmap,
 872         .descr = "Try using memory mapped access"
 873     },
 874     {
 875         .name  = "DAC_DEV",
 876         .tag   = AUD_OPT_STR,
 877         .valp  = &conf.devpath_out,
 878         .descr = "Path to DAC device"
 879     },
 880     {
 881         .name  = "ADC_DEV",
 882         .tag   = AUD_OPT_STR,
 883         .valp  = &conf.devpath_in,
 884         .descr = "Path to ADC device"
 885     },
 886     {
 887         .name  = "EXCLUSIVE",
 888         .tag   = AUD_OPT_BOOL,
 889         .valp  = &conf.exclusive,
 890         .descr = "Open device in exclusive mode (vmix wont work)"
 891     },
 892 #ifdef USE_DSP_POLICY
 893     {
 894         .name  = "POLICY",
 895         .tag   = AUD_OPT_INT,
 896         .valp  = &conf.policy,
 897         .descr = "Set the timing policy of the device, -1 to use fragment mode",
 898     },
 899 #endif
 900     {
 901         .name  = "DEBUG",
 902         .tag   = AUD_OPT_BOOL,
 903         .valp  = &conf.debug,
 904         .descr = "Turn on some debugging messages"
 905     },
 906     { /* End of list */ }
 907 };
 908
 909 static struct audio_pcm_ops oss_pcm_ops = {
 910     .init_out = oss_init_out,
 911     .fini_out = oss_fini_out,
 912     .run_out  = oss_run_out,
 913     .write    = oss_write,
 914     .ctl_out  = oss_ctl_out,
 915
 916     .init_in  = oss_init_in,
 917     .fini_in  = oss_fini_in,
 918     .run_in   = oss_run_in,
 919     .read     = oss_read,
 920     .ctl_in   = oss_ctl_in
 921 };
 922
 923 struct audio_driver oss_audio_driver = {
 924     .name           = "oss",
 925     .descr          = "OSS http://www.opensound.com",
 926     .options        = oss_options,
 927     .init           = oss_audio_init,
 928     .fini           = oss_audio_fini,
 929     .pcm_ops        = &oss_pcm_ops,
 930     .can_be_default = 1,
 931     .max_voices_out = INT_MAX,
 932     .max_voices_in  = INT_MAX,
 933     .voice_size_out = sizeof (OSSVoiceOut),
 934     .voice_size_in  = sizeof (OSSVoiceIn)
 935 };