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 typedef struct OSSVoiceOut {
  42     HWVoiceOut hw;
  43     void *pcm_buf;
  44     int fd;
  45     int nfrags;
  46     int fragsize;
  47     int mmapped;
  48     int old_optr;
  49 } OSSVoiceOut;
  50
  51 typedef struct OSSVoiceIn {
  52     HWVoiceIn hw;
  53     void *pcm_buf;
  54     int fd;
  55     int nfrags;
  56     int fragsize;
  57     int old_optr;
  58 } OSSVoiceIn;
  59
  60 static struct {
  61     int try_mmap;
  62     int nfrags;
  63     int fragsize;
  64     const char *devpath_out;
  65     const char *devpath_in;
  66     int debug;
  67     int exclusive;
  68     int policy;
  69 } conf = {
  70     .try_mmap = 0,
  71     .nfrags = 4,
  72     .fragsize = 4096,
  73     .devpath_out = "/dev/dsp",
  74     .devpath_in = "/dev/dsp",
  75     .debug = 0,
  76     .exclusive = 0,
  77     .policy = 5
  78 };
  79
  80 struct oss_params {
  81     int freq;
  82     audfmt_e fmt;
  83     int nchannels;
  84     int nfrags;
  85     int fragsize;
  86 };
  87
  88 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
  89 {
  90     va_list ap;
  91
  92     va_start (ap, fmt);
  93     AUD_vlog (AUDIO_CAP, fmt, ap);
  94     va_end (ap);
  95
  96     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
  97 }
  98
  99 static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
 100     int err,
 101     const char *typ,
 102     const char *fmt,
 103     ...
 104     )
 105 {
 106     va_list ap;
 107
 108     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 109
 110     va_start (ap, fmt);
 111     AUD_vlog (AUDIO_CAP, fmt, ap);
 112     va_end (ap);
 113
 114     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
 115 }
 116
 117 static void oss_anal_close (int *fdp)
 118 {
 119     int err = close (*fdp);
 120     if (err) {
 121         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 122     }
 123     qemu_set_fd_handler (*fdp, NULL, NULL, NULL);
 124     *fdp = -1;
 125 }
 126
 127 static void oss_helper_poll_out (void *opaque)
 128 {
 129     (void) opaque;
 130     audio_run ("oss_poll_out");
 131 }
 132
 133 static void oss_helper_poll_in (void *opaque)
 134 {
 135     (void) opaque;
 136     audio_run ("oss_poll_in");
 137 }
 138
 139 static int oss_poll_out (HWVoiceOut *hw)
 140 {
 141     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 142
 143     return qemu_set_fd_handler (oss->fd, NULL, oss_helper_poll_out, NULL);
 144 }
 145
 146 static int oss_poll_in (HWVoiceIn *hw)
 147 {
 148     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 149
 150     return qemu_set_fd_handler (oss->fd, oss_helper_poll_in, NULL, NULL);
 151 }
 152
 153 static int oss_write (SWVoiceOut *sw, void *buf, int len)
 154 {
 155     return audio_pcm_sw_write (sw, buf, len);
 156 }
 157
 158 static int aud_to_ossfmt (audfmt_e fmt)
 159 {
 160     switch (fmt) {
 161     case AUD_FMT_S8:
 162         return AFMT_S8;
 163
 164     case AUD_FMT_U8:
 165         return AFMT_U8;
 166
 167     case AUD_FMT_S16:
 168         return AFMT_S16_LE;
 169
 170     case AUD_FMT_U16:
 171         return AFMT_U16_LE;
 172
 173     default:
 174         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 175 #ifdef DEBUG_AUDIO
 176         abort ();
 177 #endif
 178         return AFMT_U8;
 179     }
 180 }
 181
 182 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
 183 {
 184     switch (ossfmt) {
 185     case AFMT_S8:
 186         *endianness = 0;
 187         *fmt = AUD_FMT_S8;
 188         break;
 189
 190     case AFMT_U8:
 191         *endianness = 0;
 192         *fmt = AUD_FMT_U8;
 193         break;
 194
 195     case AFMT_S16_LE:
 196         *endianness = 0;
 197         *fmt = AUD_FMT_S16;
 198         break;
 199
 200     case AFMT_U16_LE:
 201         *endianness = 0;
 202         *fmt = AUD_FMT_U16;
 203         break;
 204
 205     case AFMT_S16_BE:
 206         *endianness = 1;
 207         *fmt = AUD_FMT_S16;
 208         break;
 209
 210     case AFMT_U16_BE:
 211         *endianness = 1;
 212         *fmt = AUD_FMT_U16;
 213         break;
 214
 215     default:
 216         dolog ("Unrecognized audio format %d\n", ossfmt);
 217         return -1;
 218     }
 219
 220     return 0;
 221 }
 222
 223 #if defined DEBUG_MISMATCHES || defined DEBUG
 224 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 225 {
 226     dolog ("parameter | requested value | obtained value\n");
 227     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 228     dolog ("channels  |      %10d |     %10d\n",
 229            req->nchannels, obt->nchannels);
 230     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 231     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 232     dolog ("fragsize  |      %10d |     %10d\n",
 233            req->fragsize, obt->fragsize);
 234 }
 235 #endif
 236
 237 static int oss_open (int in, struct oss_params *req,
 238                      struct oss_params *obt, int *pfd)
 239 {
 240     int fd;
 241     int version;
 242     int oflags = conf.exclusive ? O_EXCL : 0;
 243     audio_buf_info abinfo;
 244     int fmt, freq, nchannels;
 245     const char *dspname = in ? conf.devpath_in : conf.devpath_out;
 246     const char *typ = in ? "ADC" : "DAC";
 247
 248     /* Kludge needed to have working mmap on Linux */
 249     oflags |= conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);
 250
 251     fd = open (dspname, oflags | O_NONBLOCK);
 252     if (-1 == fd) {
 253         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 254         return -1;
 255     }
 256
 257     freq = req->freq;
 258     nchannels = req->nchannels;
 259     fmt = req->fmt;
 260
 261     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 262         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 263         goto err;
 264     }
 265
 266     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 267         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 268                      req->nchannels);
 269         goto err;
 270     }
 271
 272     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 273         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 274         goto err;
 275     }
 276
 277     if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
 278         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 279         goto err;
 280     }
 281
 282     if (ioctl (fd, OSS_GETVERSION, &version)) {
 283         oss_logerr2 (errno, typ, "Failed to get OSS version\n");
 284         version = 0;
 285     }
 286
 287     if (conf.debug) {
 288         dolog ("OSS version = %#x\n", version);
 289     }
 290
 291 #ifdef SNDCTL_DSP_POLICY
 292     if (conf.policy >= 0 && version >= 0x040000) {
 293         int policy = conf.policy;
 294         if (ioctl (fd, SNDCTL_DSP_POLICY, &policy)) {
 295             oss_logerr2 (errno, typ, "Failed to set timing policy to %d\n",
 296                          conf.policy);
 297             goto err;
 298         }
 299     }
 300     else
 301 #endif
 302     {
 303         int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
 304         if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 305             oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 306                          req->nfrags, req->fragsize);
 307             goto err;
 308         }
 309     }
 310
 311     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 312         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 313         goto err;
 314     }
 315
 316     if (!abinfo.fragstotal || !abinfo.fragsize) {
 317         AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
 318                  abinfo.fragstotal, abinfo.fragsize, typ);
 319         goto err;
 320     }
 321
 322     obt->fmt = fmt;
 323     obt->nchannels = nchannels;
 324     obt->freq = freq;
 325     obt->nfrags = abinfo.fragstotal;
 326     obt->fragsize = abinfo.fragsize;
 327     *pfd = fd;
 328
 329 #ifdef DEBUG_MISMATCHES
 330     if ((req->fmt != obt->fmt) ||
 331         (req->nchannels != obt->nchannels) ||
 332         (req->freq != obt->freq) ||
 333         (req->fragsize != obt->fragsize) ||
 334         (req->nfrags != obt->nfrags)) {
 335         dolog ("Audio parameters mismatch\n");
 336         oss_dump_info (req, obt);
 337     }
 338 #endif
 339
 340 #ifdef DEBUG
 341     oss_dump_info (req, obt);
 342 #endif
 343     return 0;
 344
 345  err:
 346     oss_anal_close (&fd);
 347     return -1;
 348 }
 349
 350 static int oss_run_out (HWVoiceOut *hw)
 351 {
 352     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 353     int err, rpos, live, decr;
 354     int samples;
 355     uint8_t *dst;
 356     struct st_sample *src;
 357     struct audio_buf_info abinfo;
 358     struct count_info cntinfo;
 359     int bufsize;
 360
 361     live = audio_pcm_hw_get_live_out (hw);
 362     if (!live) {
 363         return 0;
 364     }
 365
 366     bufsize = hw->samples << hw->info.shift;
 367
 368     if (oss->mmapped) {
 369         int bytes;
 370
 371         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 372         if (err < 0) {
 373             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 374             return 0;
 375         }
 376
 377         if (cntinfo.ptr == oss->old_optr) {
 378             if (abs (hw->samples - live) < 64) {
 379                 dolog ("warning: Overrun\n");
 380             }
 381             return 0;
 382         }
 383
 384         if (cntinfo.ptr > oss->old_optr) {
 385             bytes = cntinfo.ptr - oss->old_optr;
 386         }
 387         else {
 388             bytes = bufsize + cntinfo.ptr - oss->old_optr;
 389         }
 390
 391         decr = audio_MIN (bytes >> hw->info.shift, live);
 392     }
 393     else {
 394         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 395         if (err < 0) {
 396             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 397             return 0;
 398         }
 399
 400         if (abinfo.bytes > bufsize) {
 401             if (conf.debug) {
 402                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
 403                        "please report your OS/audio hw to malc@pulsesoft.com\n",
 404                        abinfo.bytes, bufsize);
 405             }
 406             abinfo.bytes = bufsize;
 407         }
 408
 409         if (abinfo.bytes < 0) {
 410             if (conf.debug) {
 411                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
 412                        abinfo.bytes, bufsize);
 413             }
 414             return 0;
 415         }
 416
 417         decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
 418         if (!decr) {
 419             return 0;
 420         }
 421     }
 422
 423     samples = decr;
 424     rpos = hw->rpos;
 425     while (samples) {
 426         int left_till_end_samples = hw->samples - rpos;
 427         int convert_samples = audio_MIN (samples, left_till_end_samples);
 428
 429         src = hw->mix_buf + rpos;
 430         dst = advance (oss->pcm_buf, rpos << hw->info.shift);
 431
 432         hw->clip (dst, src, convert_samples);
 433         if (!oss->mmapped) {
 434             int written;
 435
 436             written = write (oss->fd, dst, convert_samples << hw->info.shift);
 437             /* XXX: follow errno recommendations ? */
 438             if (written == -1) {
 439                 oss_logerr (
 440                     errno,
 441                     "Failed to write %d bytes of audio data from %p\n",
 442                     convert_samples << hw->info.shift,
 443                     dst
 444                     );
 445                 continue;
 446             }
 447
 448             if (written != convert_samples << hw->info.shift) {
 449                 int wsamples = written >> hw->info.shift;
 450                 int wbytes = wsamples << hw->info.shift;
 451                 if (wbytes != written) {
 452                     dolog ("warning: Misaligned write %d (requested %d), "
 453                            "alignment %d\n",
 454                            wbytes, written, hw->info.align + 1);
 455                 }
 456                 decr -= wsamples;
 457                 rpos = (rpos + wsamples) % hw->samples;
 458                 break;
 459             }
 460         }
 461
 462         rpos = (rpos + convert_samples) % hw->samples;
 463         samples -= convert_samples;
 464     }
 465     if (oss->mmapped) {
 466         oss->old_optr = cntinfo.ptr;
 467     }
 468
 469     hw->rpos = rpos;
 470     return decr;
 471 }
 472
 473 static void oss_fini_out (HWVoiceOut *hw)
 474 {
 475     int err;
 476     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 477
 478     ldebug ("oss_fini\n");
 479     oss_anal_close (&oss->fd);
 480
 481     if (oss->pcm_buf) {
 482         if (oss->mmapped) {
 483             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 484             if (err) {
 485                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 486                             oss->pcm_buf, hw->samples << hw->info.shift);
 487             }
 488         }
 489         else {
 490             qemu_free (oss->pcm_buf);
 491         }
 492         oss->pcm_buf = NULL;
 493     }
 494 }
 495
 496 static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)
 497 {
 498     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 499     struct oss_params req, obt;
 500     int endianness;
 501     int err;
 502     int fd;
 503     audfmt_e effective_fmt;
 504     struct audsettings obt_as;
 505
 506     oss->fd = -1;
 507
 508     req.fmt = aud_to_ossfmt (as->fmt);
 509     req.freq = as->freq;
 510     req.nchannels = as->nchannels;
 511     req.fragsize = conf.fragsize;
 512     req.nfrags = conf.nfrags;
 513
 514     if (oss_open (0, &req, &obt, &fd)) {
 515         return -1;
 516     }
 517
 518     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 519     if (err) {
 520         oss_anal_close (&fd);
 521         return -1;
 522     }
 523
 524     obt_as.freq = obt.freq;
 525     obt_as.nchannels = obt.nchannels;
 526     obt_as.fmt = effective_fmt;
 527     obt_as.endianness = endianness;
 528
 529     audio_pcm_init_info (&hw->info, &obt_as);
 530     oss->nfrags = obt.nfrags;
 531     oss->fragsize = obt.fragsize;
 532
 533     if (obt.nfrags * obt.fragsize & hw->info.align) {
 534         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 535                obt.nfrags * obt.fragsize, hw->info.align + 1);
 536     }
 537
 538     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 539
 540     oss->mmapped = 0;
 541     if (conf.try_mmap) {
 542         oss->pcm_buf = mmap (
 543             NULL,
 544             hw->samples << hw->info.shift,
 545             PROT_READ | PROT_WRITE,
 546             MAP_SHARED,
 547             fd,
 548             0
 549             );
 550         if (oss->pcm_buf == MAP_FAILED) {
 551             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 552                         hw->samples << hw->info.shift);
 553         } else {
 554             int err;
 555             int trig = 0;
 556             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 557                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 558             }
 559             else {
 560                 trig = PCM_ENABLE_OUTPUT;
 561                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 562                     oss_logerr (
 563                         errno,
 564                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 565                         );
 566                 }
 567                 else {
 568                     oss->mmapped = 1;
 569                 }
 570             }
 571
 572             if (!oss->mmapped) {
 573                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 574                 if (err) {
 575                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 576                                 oss->pcm_buf, hw->samples << hw->info.shift);
 577                 }
 578             }
 579         }
 580     }
 581
 582     if (!oss->mmapped) {
 583         oss->pcm_buf = audio_calloc (
 584             AUDIO_FUNC,
 585             hw->samples,
 586             1 << hw->info.shift
 587             );
 588         if (!oss->pcm_buf) {
 589             dolog (
 590                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 591                 hw->samples,
 592                 1 << hw->info.shift
 593                 );
 594             oss_anal_close (&fd);
 595             return -1;
 596         }
 597     }
 598
 599     oss->fd = fd;
 600     return 0;
 601 }
 602
 603 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 604 {
 605     int trig;
 606     va_list ap;
 607     int poll_mode;
 608     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 609
 610     va_start (ap, cmd);
 611     poll_mode = va_arg (ap, int);
 612     va_end (ap);
 613
 614     switch (cmd) {
 615     case VOICE_ENABLE:
 616         ldebug ("enabling voice\n");
 617         if (poll_mode && oss_poll_out (hw)) {
 618             poll_mode = 0;
 619         }
 620         hw->poll_mode = poll_mode;
 621
 622         if (!oss->mmapped) {
 623             return 0;
 624         }
 625
 626         audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 627         trig = PCM_ENABLE_OUTPUT;
 628         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 629             oss_logerr (
 630                 errno,
 631                 "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 632                 );
 633             return -1;
 634         }
 635         break;
 636
 637     case VOICE_DISABLE:
 638         if (hw->poll_mode) {
 639             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 640             hw->poll_mode = 0;
 641         }
 642
 643         if (!oss->mmapped) {
 644             return 0;
 645         }
 646
 647         ldebug ("disabling voice\n");
 648         trig = 0;
 649         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 650             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 651             return -1;
 652         }
 653         break;
 654     }
 655     return 0;
 656 }
 657
 658 static int oss_init_in (HWVoiceIn *hw, struct audsettings *as)
 659 {
 660     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 661     struct oss_params req, obt;
 662     int endianness;
 663     int err;
 664     int fd;
 665     audfmt_e effective_fmt;
 666     struct audsettings obt_as;
 667
 668     oss->fd = -1;
 669
 670     req.fmt = aud_to_ossfmt (as->fmt);
 671     req.freq = as->freq;
 672     req.nchannels = as->nchannels;
 673     req.fragsize = conf.fragsize;
 674     req.nfrags = conf.nfrags;
 675     if (oss_open (1, &req, &obt, &fd)) {
 676         return -1;
 677     }
 678
 679     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 680     if (err) {
 681         oss_anal_close (&fd);
 682         return -1;
 683     }
 684
 685     obt_as.freq = obt.freq;
 686     obt_as.nchannels = obt.nchannels;
 687     obt_as.fmt = effective_fmt;
 688     obt_as.endianness = endianness;
 689
 690     audio_pcm_init_info (&hw->info, &obt_as);
 691     oss->nfrags = obt.nfrags;
 692     oss->fragsize = obt.fragsize;
 693
 694     if (obt.nfrags * obt.fragsize & hw->info.align) {
 695         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 696                obt.nfrags * obt.fragsize, hw->info.align + 1);
 697     }
 698
 699     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 700     oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 701     if (!oss->pcm_buf) {
 702         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 703                hw->samples, 1 << hw->info.shift);
 704         oss_anal_close (&fd);
 705         return -1;
 706     }
 707
 708     oss->fd = fd;
 709     return 0;
 710 }
 711
 712 static void oss_fini_in (HWVoiceIn *hw)
 713 {
 714     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 715
 716     oss_anal_close (&oss->fd);
 717
 718     if (oss->pcm_buf) {
 719         qemu_free (oss->pcm_buf);
 720         oss->pcm_buf = NULL;
 721     }
 722 }
 723
 724 static int oss_run_in (HWVoiceIn *hw)
 725 {
 726     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 727     int hwshift = hw->info.shift;
 728     int i;
 729     int live = audio_pcm_hw_get_live_in (hw);
 730     int dead = hw->samples - live;
 731     size_t read_samples = 0;
 732     struct {
 733         int add;
 734         int len;
 735     } bufs[2] = {
 736         { .add = hw->wpos, .len = 0 },
 737         { .add = 0,        .len = 0 }
 738     };
 739
 740     if (!dead) {
 741         return 0;
 742     }
 743
 744     if (hw->wpos + dead > hw->samples) {
 745         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 746         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 747     }
 748     else {
 749         bufs[0].len = dead << hwshift;
 750     }
 751
 752
 753     for (i = 0; i < 2; ++i) {
 754         ssize_t nread;
 755
 756         if (bufs[i].len) {
 757             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 758             nread = read (oss->fd, p, bufs[i].len);
 759
 760             if (nread > 0) {
 761                 if (nread & hw->info.align) {
 762                     dolog ("warning: Misaligned read %zd (requested %d), "
 763                            "alignment %d\n", nread, bufs[i].add << hwshift,
 764                            hw->info.align + 1);
 765                 }
 766                 read_samples += nread >> hwshift;
 767                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift,
 768                           &nominal_volume);
 769             }
 770
 771             if (bufs[i].len - nread) {
 772                 if (nread == -1) {
 773                     switch (errno) {
 774                     case EINTR:
 775                     case EAGAIN:
 776                         break;
 777                     default:
 778                         oss_logerr (
 779                             errno,
 780                             "Failed to read %d bytes of audio (to %p)\n",
 781                             bufs[i].len, p
 782                             );
 783                         break;
 784                     }
 785                 }
 786                 break;
 787             }
 788         }
 789     }
 790
 791     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 792     return read_samples;
 793 }
 794
 795 static int oss_read (SWVoiceIn *sw, void *buf, int size)
 796 {
 797     return audio_pcm_sw_read (sw, buf, size);
 798 }
 799
 800 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 801 {
 802     va_list ap;
 803     int poll_mode;
 804     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 805
 806     va_start (ap, cmd);
 807     poll_mode = va_arg (ap, int);
 808     va_end (ap);
 809
 810     switch (cmd) {
 811     case VOICE_ENABLE:
 812         if (poll_mode && oss_poll_in (hw)) {
 813             poll_mode = 0;
 814         }
 815         hw->poll_mode = poll_mode;
 816         break;
 817
 818     case VOICE_DISABLE:
 819         if (hw->poll_mode) {
 820             hw->poll_mode = 0;
 821             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 822         }
 823         break;
 824     }
 825     return 0;
 826 }
 827
 828 static void *oss_audio_init (void)
 829 {
 830     return &conf;
 831 }
 832
 833 static void oss_audio_fini (void *opaque)
 834 {
 835     (void) opaque;
 836 }
 837
 838 static struct audio_option oss_options[] = {
 839     {
 840         .name  = "FRAGSIZE",
 841         .tag   = AUD_OPT_INT,
 842         .valp  = &conf.fragsize,
 843         .descr = "Fragment size in bytes"
 844     },
 845     {
 846         .name  = "NFRAGS",
 847         .tag   = AUD_OPT_INT,
 848         .valp  = &conf.nfrags,
 849         .descr = "Number of fragments"
 850     },
 851     {
 852         .name  = "MMAP",
 853         .tag   = AUD_OPT_BOOL,
 854         .valp  = &conf.try_mmap,
 855         .descr = "Try using memory mapped access"
 856     },
 857     {
 858         .name  = "DAC_DEV",
 859         .tag   = AUD_OPT_STR,
 860         .valp  = &conf.devpath_out,
 861         .descr = "Path to DAC device"
 862     },
 863     {
 864         .name  = "ADC_DEV",
 865         .tag   = AUD_OPT_STR,
 866         .valp  = &conf.devpath_in,
 867         .descr = "Path to ADC device"
 868     },
 869     {
 870         .name  = "EXCLUSIVE",
 871         .tag   = AUD_OPT_BOOL,
 872         .valp  = &conf.exclusive,
 873         .descr = "Open device in exclusive mode (vmix wont work)"
 874     },
 875 #ifdef SNDCTL_DSP_POLICY
 876     {
 877         .name  = "POLICY",
 878         .tag   = AUD_OPT_INT,
 879         .valp  = &conf.policy,
 880         .descr = "Set the timing policy of the device, -1 to use fragment mode",
 881     },
 882 #endif
 883     {
 884         .name  = "DEBUG",
 885         .tag   = AUD_OPT_BOOL,
 886         .valp  = &conf.debug,
 887         .descr = "Turn on some debugging messages"
 888     },
 889     { /* End of list */ }
 890 };
 891
 892 static struct audio_pcm_ops oss_pcm_ops = {
 893     .init_out = oss_init_out,
 894     .fini_out = oss_fini_out,
 895     .run_out  = oss_run_out,
 896     .write    = oss_write,
 897     .ctl_out  = oss_ctl_out,
 898
 899     .init_in  = oss_init_in,
 900     .fini_in  = oss_fini_in,
 901     .run_in   = oss_run_in,
 902     .read     = oss_read,
 903     .ctl_in   = oss_ctl_in
 904 };
 905
 906 struct audio_driver oss_audio_driver = {
 907     .name           = "oss",
 908     .descr          = "OSS http://www.opensound.com",
 909     .options        = oss_options,
 910     .init           = oss_audio_init,
 911     .fini           = oss_audio_fini,
 912     .pcm_ops        = &oss_pcm_ops,
 913     .can_be_default = 1,
 914     .max_voices_out = INT_MAX,
 915     .max_voices_in  = INT_MAX,
 916     .voice_size_out = sizeof (OSSVoiceOut),
 917     .voice_size_in  = sizeof (OSSVoiceIn)
 918 };