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