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 "main-loop.h"
  35 #include "host-utils.h"
  36 #include "qemu-char.h"
  37 #include "audio.h"
  38
  39 #define AUDIO_CAP "oss"
  40 #include "audio_int.h"
  41
  42 #if defined OSS_GETVERSION && defined SNDCTL_DSP_POLICY
  43 #define USE_DSP_POLICY
  44 #endif
  45
  46 typedef struct OSSVoiceOut {
  47     HWVoiceOut hw;
  48     void *pcm_buf;
  49     int fd;
  50     int wpos;
  51     int nfrags;
  52     int fragsize;
  53     int mmapped;
  54     int pending;
  55 } OSSVoiceOut;
  56
  57 typedef struct OSSVoiceIn {
  58     HWVoiceIn hw;
  59     void *pcm_buf;
  60     int fd;
  61     int nfrags;
  62     int fragsize;
  63 } OSSVoiceIn;
  64
  65 static struct {
  66     int try_mmap;
  67     int nfrags;
  68     int fragsize;
  69     const char *devpath_out;
  70     const char *devpath_in;
  71     int debug;
  72     int exclusive;
  73     int policy;
  74 } conf = {
  75     .try_mmap = 0,
  76     .nfrags = 4,
  77     .fragsize = 4096,
  78     .devpath_out = "/dev/dsp",
  79     .devpath_in = "/dev/dsp",
  80     .debug = 0,
  81     .exclusive = 0,
  82     .policy = 5
  83 };
  84
  85 struct oss_params {
  86     int freq;
  87     audfmt_e fmt;
  88     int nchannels;
  89     int nfrags;
  90     int fragsize;
  91 };
  92
  93 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
  94 {
  95     va_list ap;
  96
  97     va_start (ap, fmt);
  98     AUD_vlog (AUDIO_CAP, fmt, ap);
  99     va_end (ap);
 100
 101     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
 102 }
 103
 104 static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
 105     int err,
 106     const char *typ,
 107     const char *fmt,
 108     ...
 109     )
 110 {
 111     va_list ap;
 112
 113     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 114
 115     va_start (ap, fmt);
 116     AUD_vlog (AUDIO_CAP, fmt, ap);
 117     va_end (ap);
 118
 119     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
 120 }
 121
 122 static void oss_anal_close (int *fdp)
 123 {
 124     int err;
 125
 126     qemu_set_fd_handler (*fdp, NULL, NULL, NULL);
 127     err = close (*fdp);
 128     if (err) {
 129         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 130     }
 131     *fdp = -1;
 132 }
 133
 134 static void oss_helper_poll_out (void *opaque)
 135 {
 136     (void) opaque;
 137     audio_run ("oss_poll_out");
 138 }
 139
 140 static void oss_helper_poll_in (void *opaque)
 141 {
 142     (void) opaque;
 143     audio_run ("oss_poll_in");
 144 }
 145
 146 static int oss_poll_out (HWVoiceOut *hw)
 147 {
 148     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 149
 150     return qemu_set_fd_handler (oss->fd, NULL, oss_helper_poll_out, NULL);
 151 }
 152
 153 static int oss_poll_in (HWVoiceIn *hw)
 154 {
 155     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 156
 157     return qemu_set_fd_handler (oss->fd, oss_helper_poll_in, NULL, NULL);
 158 }
 159
 160 static int oss_write (SWVoiceOut *sw, void *buf, int len)
 161 {
 162     return audio_pcm_sw_write (sw, buf, len);
 163 }
 164
 165 static int aud_to_ossfmt (audfmt_e fmt, int endianness)
 166 {
 167     switch (fmt) {
 168     case AUD_FMT_S8:
 169         return AFMT_S8;
 170
 171     case AUD_FMT_U8:
 172         return AFMT_U8;
 173
 174     case AUD_FMT_S16:
 175         if (endianness) {
 176             return AFMT_S16_BE;
 177         }
 178         else {
 179             return AFMT_S16_LE;
 180         }
 181
 182     case AUD_FMT_U16:
 183         if (endianness) {
 184             return AFMT_U16_BE;
 185         }
 186         else {
 187             return AFMT_U16_LE;
 188         }
 189
 190     default:
 191         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 192 #ifdef DEBUG_AUDIO
 193         abort ();
 194 #endif
 195         return AFMT_U8;
 196     }
 197 }
 198
 199 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
 200 {
 201     switch (ossfmt) {
 202     case AFMT_S8:
 203         *endianness = 0;
 204         *fmt = AUD_FMT_S8;
 205         break;
 206
 207     case AFMT_U8:
 208         *endianness = 0;
 209         *fmt = AUD_FMT_U8;
 210         break;
 211
 212     case AFMT_S16_LE:
 213         *endianness = 0;
 214         *fmt = AUD_FMT_S16;
 215         break;
 216
 217     case AFMT_U16_LE:
 218         *endianness = 0;
 219         *fmt = AUD_FMT_U16;
 220         break;
 221
 222     case AFMT_S16_BE:
 223         *endianness = 1;
 224         *fmt = AUD_FMT_S16;
 225         break;
 226
 227     case AFMT_U16_BE:
 228         *endianness = 1;
 229         *fmt = AUD_FMT_U16;
 230         break;
 231
 232     default:
 233         dolog ("Unrecognized audio format %d\n", ossfmt);
 234         return -1;
 235     }
 236
 237     return 0;
 238 }
 239
 240 #if defined DEBUG_MISMATCHES || defined DEBUG
 241 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 242 {
 243     dolog ("parameter | requested value | obtained value\n");
 244     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 245     dolog ("channels  |      %10d |     %10d\n",
 246            req->nchannels, obt->nchannels);
 247     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 248     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 249     dolog ("fragsize  |      %10d |     %10d\n",
 250            req->fragsize, obt->fragsize);
 251 }
 252 #endif
 253
 254 #ifdef USE_DSP_POLICY
 255 static int oss_get_version (int fd, int *version, const char *typ)
 256 {
 257     if (ioctl (fd, OSS_GETVERSION, &version)) {
 258 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 259         /*
 260          * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION
 261          * since 7.x, but currently only on the mixer device (or in
 262          * the Linuxolator), and in the native version that part of
 263          * the code is in fact never reached so the ioctl fails anyway.
 264          * Until this is fixed, just check the errno and if its what
 265          * FreeBSD's sound drivers return atm assume they are new enough.
 266          */
 267         if (errno == EINVAL) {
 268             *version = 0x040000;
 269             return 0;
 270         }
 271 #endif
 272         oss_logerr2 (errno, typ, "Failed to get OSS version\n");
 273         return -1;
 274     }
 275     return 0;
 276 }
 277 #endif
 278
 279 static int oss_open (int in, struct oss_params *req,
 280                      struct oss_params *obt, int *pfd)
 281 {
 282     int fd;
 283     int oflags = conf.exclusive ? O_EXCL : 0;
 284     audio_buf_info abinfo;
 285     int fmt, freq, nchannels;
 286     int setfragment = 1;
 287     const char *dspname = in ? conf.devpath_in : conf.devpath_out;
 288     const char *typ = in ? "ADC" : "DAC";
 289
 290     /* Kludge needed to have working mmap on Linux */
 291     oflags |= conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);
 292
 293     fd = open (dspname, oflags | O_NONBLOCK);
 294     if (-1 == fd) {
 295         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 296         return -1;
 297     }
 298
 299     freq = req->freq;
 300     nchannels = req->nchannels;
 301     fmt = req->fmt;
 302
 303     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 304         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 305         goto err;
 306     }
 307
 308     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 309         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 310                      req->nchannels);
 311         goto err;
 312     }
 313
 314     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 315         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 316         goto err;
 317     }
 318
 319     if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
 320         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 321         goto err;
 322     }
 323
 324 #ifdef USE_DSP_POLICY
 325     if (conf.policy >= 0) {
 326         int version;
 327
 328         if (!oss_get_version (fd, &version, typ)) {
 329             if (conf.debug) {
 330                 dolog ("OSS version = %#x\n", version);
 331             }
 332
 333             if (version >= 0x040000) {
 334                 int policy = conf.policy;
 335                 if (ioctl (fd, SNDCTL_DSP_POLICY, &policy)) {
 336                     oss_logerr2 (errno, typ,
 337                                  "Failed to set timing policy to %d\n",
 338                                  conf.policy);
 339                     goto err;
 340                 }
 341                 setfragment = 0;
 342             }
 343         }
 344     }
 345 #endif
 346
 347     if (setfragment) {
 348         int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
 349         if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 350             oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 351                          req->nfrags, req->fragsize);
 352             goto err;
 353         }
 354     }
 355
 356     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 357         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 358         goto err;
 359     }
 360
 361     if (!abinfo.fragstotal || !abinfo.fragsize) {
 362         AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
 363                  abinfo.fragstotal, abinfo.fragsize, typ);
 364         goto err;
 365     }
 366
 367     obt->fmt = fmt;
 368     obt->nchannels = nchannels;
 369     obt->freq = freq;
 370     obt->nfrags = abinfo.fragstotal;
 371     obt->fragsize = abinfo.fragsize;
 372     *pfd = fd;
 373
 374 #ifdef DEBUG_MISMATCHES
 375     if ((req->fmt != obt->fmt) ||
 376         (req->nchannels != obt->nchannels) ||
 377         (req->freq != obt->freq) ||
 378         (req->fragsize != obt->fragsize) ||
 379         (req->nfrags != obt->nfrags)) {
 380         dolog ("Audio parameters mismatch\n");
 381         oss_dump_info (req, obt);
 382     }
 383 #endif
 384
 385 #ifdef DEBUG
 386     oss_dump_info (req, obt);
 387 #endif
 388     return 0;
 389
 390  err:
 391     oss_anal_close (&fd);
 392     return -1;
 393 }
 394
 395 static void oss_write_pending (OSSVoiceOut *oss)
 396 {
 397     HWVoiceOut *hw = &oss->hw;
 398
 399     if (oss->mmapped) {
 400         return;
 401     }
 402
 403     while (oss->pending) {
 404         int samples_written;
 405         ssize_t bytes_written;
 406         int samples_till_end = hw->samples - oss->wpos;
 407         int samples_to_write = audio_MIN (oss->pending, samples_till_end);
 408         int bytes_to_write = samples_to_write << hw->info.shift;
 409         void *pcm = advance (oss->pcm_buf, oss->wpos << hw->info.shift);
 410
 411         bytes_written = write (oss->fd, pcm, bytes_to_write);
 412         if (bytes_written < 0) {
 413             if (errno != EAGAIN) {
 414                 oss_logerr (errno, "failed to write %d bytes\n",
 415                             bytes_to_write);
 416             }
 417             break;
 418         }
 419
 420         if (bytes_written & hw->info.align) {
 421             dolog ("misaligned write asked for %d, but got %zd\n",
 422                    bytes_to_write, bytes_written);
 423             return;
 424         }
 425
 426         samples_written = bytes_written >> hw->info.shift;
 427         oss->pending -= samples_written;
 428         oss->wpos = (oss->wpos + samples_written) % hw->samples;
 429         if (bytes_written - bytes_to_write) {
 430             break;
 431         }
 432     }
 433 }
 434
 435 static int oss_run_out (HWVoiceOut *hw, int live)
 436 {
 437     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 438     int err, decr;
 439     struct audio_buf_info abinfo;
 440     struct count_info cntinfo;
 441     int bufsize;
 442
 443     bufsize = hw->samples << hw->info.shift;
 444
 445     if (oss->mmapped) {
 446         int bytes, pos;
 447
 448         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 449         if (err < 0) {
 450             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 451             return 0;
 452         }
 453
 454         pos = hw->rpos << hw->info.shift;
 455         bytes = audio_ring_dist (cntinfo.ptr, pos, bufsize);
 456         decr = audio_MIN (bytes >> hw->info.shift, live);
 457     }
 458     else {
 459         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 460         if (err < 0) {
 461             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 462             return 0;
 463         }
 464
 465         if (abinfo.bytes > bufsize) {
 466             if (conf.debug) {
 467                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
 468                        "please report your OS/audio hw to av1474@comtv.ru\n",
 469                        abinfo.bytes, bufsize);
 470             }
 471             abinfo.bytes = bufsize;
 472         }
 473
 474         if (abinfo.bytes < 0) {
 475             if (conf.debug) {
 476                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
 477                        abinfo.bytes, bufsize);
 478             }
 479             return 0;
 480         }
 481
 482         decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
 483         if (!decr) {
 484             return 0;
 485         }
 486     }
 487
 488     decr = audio_pcm_hw_clip_out (hw, oss->pcm_buf, decr, oss->pending);
 489     oss->pending += decr;
 490     oss_write_pending (oss);
 491
 492     return decr;
 493 }
 494
 495 static void oss_fini_out (HWVoiceOut *hw)
 496 {
 497     int err;
 498     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 499
 500     ldebug ("oss_fini\n");
 501     oss_anal_close (&oss->fd);
 502
 503     if (oss->pcm_buf) {
 504         if (oss->mmapped) {
 505             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 506             if (err) {
 507                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 508                             oss->pcm_buf, hw->samples << hw->info.shift);
 509             }
 510         }
 511         else {
 512             g_free (oss->pcm_buf);
 513         }
 514         oss->pcm_buf = NULL;
 515     }
 516 }
 517
 518 static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)
 519 {
 520     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 521     struct oss_params req, obt;
 522     int endianness;
 523     int err;
 524     int fd;
 525     audfmt_e effective_fmt;
 526     struct audsettings obt_as;
 527
 528     oss->fd = -1;
 529
 530     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 531     req.freq = as->freq;
 532     req.nchannels = as->nchannels;
 533     req.fragsize = conf.fragsize;
 534     req.nfrags = conf.nfrags;
 535
 536     if (oss_open (0, &req, &obt, &fd)) {
 537         return -1;
 538     }
 539
 540     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 541     if (err) {
 542         oss_anal_close (&fd);
 543         return -1;
 544     }
 545
 546     obt_as.freq = obt.freq;
 547     obt_as.nchannels = obt.nchannels;
 548     obt_as.fmt = effective_fmt;
 549     obt_as.endianness = endianness;
 550
 551     audio_pcm_init_info (&hw->info, &obt_as);
 552     oss->nfrags = obt.nfrags;
 553     oss->fragsize = obt.fragsize;
 554
 555     if (obt.nfrags * obt.fragsize & hw->info.align) {
 556         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 557                obt.nfrags * obt.fragsize, hw->info.align + 1);
 558     }
 559
 560     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 561
 562     oss->mmapped = 0;
 563     if (conf.try_mmap) {
 564         oss->pcm_buf = mmap (
 565             NULL,
 566             hw->samples << hw->info.shift,
 567             PROT_READ | PROT_WRITE,
 568             MAP_SHARED,
 569             fd,
 570             0
 571             );
 572         if (oss->pcm_buf == MAP_FAILED) {
 573             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 574                         hw->samples << hw->info.shift);
 575         }
 576         else {
 577             int err;
 578             int trig = 0;
 579             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 580                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 581             }
 582             else {
 583                 trig = PCM_ENABLE_OUTPUT;
 584                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 585                     oss_logerr (
 586                         errno,
 587                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 588                         );
 589                 }
 590                 else {
 591                     oss->mmapped = 1;
 592                 }
 593             }
 594
 595             if (!oss->mmapped) {
 596                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 597                 if (err) {
 598                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 599                                 oss->pcm_buf, hw->samples << hw->info.shift);
 600                 }
 601             }
 602         }
 603     }
 604
 605     if (!oss->mmapped) {
 606         oss->pcm_buf = audio_calloc (
 607             AUDIO_FUNC,
 608             hw->samples,
 609             1 << hw->info.shift
 610             );
 611         if (!oss->pcm_buf) {
 612             dolog (
 613                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 614                 hw->samples,
 615                 1 << hw->info.shift
 616                 );
 617             oss_anal_close (&fd);
 618             return -1;
 619         }
 620     }
 621
 622     oss->fd = fd;
 623     return 0;
 624 }
 625
 626 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 627 {
 628     int trig;
 629     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 630
 631     switch (cmd) {
 632     case VOICE_ENABLE:
 633         {
 634             va_list ap;
 635             int poll_mode;
 636
 637             va_start (ap, cmd);
 638             poll_mode = va_arg (ap, int);
 639             va_end (ap);
 640
 641             ldebug ("enabling voice\n");
 642             if (poll_mode && oss_poll_out (hw)) {
 643                 poll_mode = 0;
 644             }
 645             hw->poll_mode = poll_mode;
 646
 647             if (!oss->mmapped) {
 648                 return 0;
 649             }
 650
 651             audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 652             trig = PCM_ENABLE_OUTPUT;
 653             if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 654                 oss_logerr (
 655                     errno,
 656                     "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 657                     );
 658                 return -1;
 659             }
 660         }
 661         break;
 662
 663     case VOICE_DISABLE:
 664         if (hw->poll_mode) {
 665             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 666             hw->poll_mode = 0;
 667         }
 668
 669         if (!oss->mmapped) {
 670             return 0;
 671         }
 672
 673         ldebug ("disabling voice\n");
 674         trig = 0;
 675         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 676             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 677             return -1;
 678         }
 679         break;
 680     }
 681     return 0;
 682 }
 683
 684 static int oss_init_in (HWVoiceIn *hw, struct audsettings *as)
 685 {
 686     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 687     struct oss_params req, obt;
 688     int endianness;
 689     int err;
 690     int fd;
 691     audfmt_e effective_fmt;
 692     struct audsettings obt_as;
 693
 694     oss->fd = -1;
 695
 696     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 697     req.freq = as->freq;
 698     req.nchannels = as->nchannels;
 699     req.fragsize = conf.fragsize;
 700     req.nfrags = conf.nfrags;
 701     if (oss_open (1, &req, &obt, &fd)) {
 702         return -1;
 703     }
 704
 705     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 706     if (err) {
 707         oss_anal_close (&fd);
 708         return -1;
 709     }
 710
 711     obt_as.freq = obt.freq;
 712     obt_as.nchannels = obt.nchannels;
 713     obt_as.fmt = effective_fmt;
 714     obt_as.endianness = endianness;
 715
 716     audio_pcm_init_info (&hw->info, &obt_as);
 717     oss->nfrags = obt.nfrags;
 718     oss->fragsize = obt.fragsize;
 719
 720     if (obt.nfrags * obt.fragsize & hw->info.align) {
 721         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 722                obt.nfrags * obt.fragsize, hw->info.align + 1);
 723     }
 724
 725     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 726     oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 727     if (!oss->pcm_buf) {
 728         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 729                hw->samples, 1 << hw->info.shift);
 730         oss_anal_close (&fd);
 731         return -1;
 732     }
 733
 734     oss->fd = fd;
 735     return 0;
 736 }
 737
 738 static void oss_fini_in (HWVoiceIn *hw)
 739 {
 740     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 741
 742     oss_anal_close (&oss->fd);
 743
 744     if (oss->pcm_buf) {
 745         g_free (oss->pcm_buf);
 746         oss->pcm_buf = NULL;
 747     }
 748 }
 749
 750 static int oss_run_in (HWVoiceIn *hw)
 751 {
 752     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 753     int hwshift = hw->info.shift;
 754     int i;
 755     int live = audio_pcm_hw_get_live_in (hw);
 756     int dead = hw->samples - live;
 757     size_t read_samples = 0;
 758     struct {
 759         int add;
 760         int len;
 761     } bufs[2] = {
 762         { .add = hw->wpos, .len = 0 },
 763         { .add = 0,        .len = 0 }
 764     };
 765
 766     if (!dead) {
 767         return 0;
 768     }
 769
 770     if (hw->wpos + dead > hw->samples) {
 771         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 772         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 773     }
 774     else {
 775         bufs[0].len = dead << hwshift;
 776     }
 777
 778     for (i = 0; i < 2; ++i) {
 779         ssize_t nread;
 780
 781         if (bufs[i].len) {
 782             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 783             nread = read (oss->fd, p, bufs[i].len);
 784
 785             if (nread > 0) {
 786                 if (nread & hw->info.align) {
 787                     dolog ("warning: Misaligned read %zd (requested %d), "
 788                            "alignment %d\n", nread, bufs[i].add << hwshift,
 789                            hw->info.align + 1);
 790                 }
 791                 read_samples += nread >> hwshift;
 792                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift);
 793             }
 794
 795             if (bufs[i].len - nread) {
 796                 if (nread == -1) {
 797                     switch (errno) {
 798                     case EINTR:
 799                     case EAGAIN:
 800                         break;
 801                     default:
 802                         oss_logerr (
 803                             errno,
 804                             "Failed to read %d bytes of audio (to %p)\n",
 805                             bufs[i].len, p
 806                             );
 807                         break;
 808                     }
 809                 }
 810                 break;
 811             }
 812         }
 813     }
 814
 815     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 816     return read_samples;
 817 }
 818
 819 static int oss_read (SWVoiceIn *sw, void *buf, int size)
 820 {
 821     return audio_pcm_sw_read (sw, buf, size);
 822 }
 823
 824 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 825 {
 826     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 827
 828     switch (cmd) {
 829     case VOICE_ENABLE:
 830         {
 831             va_list ap;
 832             int poll_mode;
 833
 834             va_start (ap, cmd);
 835             poll_mode = va_arg (ap, int);
 836             va_end (ap);
 837
 838             if (poll_mode && oss_poll_in (hw)) {
 839                 poll_mode = 0;
 840             }
 841             hw->poll_mode = poll_mode;
 842         }
 843         break;
 844
 845     case VOICE_DISABLE:
 846         if (hw->poll_mode) {
 847             hw->poll_mode = 0;
 848             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 849         }
 850         break;
 851     }
 852     return 0;
 853 }
 854
 855 static void *oss_audio_init (void)
 856 {
 857     return &conf;
 858 }
 859
 860 static void oss_audio_fini (void *opaque)
 861 {
 862     (void) opaque;
 863 }
 864
 865 static struct audio_option oss_options[] = {
 866     {
 867         .name  = "FRAGSIZE",
 868         .tag   = AUD_OPT_INT,
 869         .valp  = &conf.fragsize,
 870         .descr = "Fragment size in bytes"
 871     },
 872     {
 873         .name  = "NFRAGS",
 874         .tag   = AUD_OPT_INT,
 875         .valp  = &conf.nfrags,
 876         .descr = "Number of fragments"
 877     },
 878     {
 879         .name  = "MMAP",
 880         .tag   = AUD_OPT_BOOL,
 881         .valp  = &conf.try_mmap,
 882         .descr = "Try using memory mapped access"
 883     },
 884     {
 885         .name  = "DAC_DEV",
 886         .tag   = AUD_OPT_STR,
 887         .valp  = &conf.devpath_out,
 888         .descr = "Path to DAC device"
 889     },
 890     {
 891         .name  = "ADC_DEV",
 892         .tag   = AUD_OPT_STR,
 893         .valp  = &conf.devpath_in,
 894         .descr = "Path to ADC device"
 895     },
 896     {
 897         .name  = "EXCLUSIVE",
 898         .tag   = AUD_OPT_BOOL,
 899         .valp  = &conf.exclusive,
 900         .descr = "Open device in exclusive mode (vmix wont work)"
 901     },
 902 #ifdef USE_DSP_POLICY
 903     {
 904         .name  = "POLICY",
 905         .tag   = AUD_OPT_INT,
 906         .valp  = &conf.policy,
 907         .descr = "Set the timing policy of the device, -1 to use fragment mode",
 908     },
 909 #endif
 910     {
 911         .name  = "DEBUG",
 912         .tag   = AUD_OPT_BOOL,
 913         .valp  = &conf.debug,
 914         .descr = "Turn on some debugging messages"
 915     },
 916     { /* End of list */ }
 917 };
 918
 919 static struct audio_pcm_ops oss_pcm_ops = {
 920     .init_out = oss_init_out,
 921     .fini_out = oss_fini_out,
 922     .run_out  = oss_run_out,
 923     .write    = oss_write,
 924     .ctl_out  = oss_ctl_out,
 925
 926     .init_in  = oss_init_in,
 927     .fini_in  = oss_fini_in,
 928     .run_in   = oss_run_in,
 929     .read     = oss_read,
 930     .ctl_in   = oss_ctl_in
 931 };
 932
 933 struct audio_driver oss_audio_driver = {
 934     .name           = "oss",
 935     .descr          = "OSS http://www.opensound.com",
 936     .options        = oss_options,
 937     .init           = oss_audio_init,
 938     .fini           = oss_audio_fini,
 939     .pcm_ops        = &oss_pcm_ops,
 940     .can_be_default = 1,
 941     .max_voices_out = INT_MAX,
 942     .max_voices_in  = INT_MAX,
 943     .voice_size_out = sizeof (OSSVoiceOut),
 944     .voice_size_in  = sizeof (OSSVoiceIn)
 945 };