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 #include <sys/soundcard.h>
  29 #include "qemu-common.h"
  30 #include "qemu/main-loop.h"
  31 #include "qemu/host-utils.h"
  32 #include "audio.h"
  33
  34 #define AUDIO_CAP "oss"
  35 #include "audio_int.h"
  36
  37 #if defined OSS_GETVERSION && defined SNDCTL_DSP_POLICY
  38 #define USE_DSP_POLICY
  39 #endif
  40
  41 typedef struct OSSVoiceOut {
  42     HWVoiceOut hw;
  43     void *pcm_buf;
  44     int fd;
  45     int wpos;
  46     int nfrags;
  47     int fragsize;
  48     int mmapped;
  49     int pending;
  50 } OSSVoiceOut;
  51
  52 typedef struct OSSVoiceIn {
  53     HWVoiceIn hw;
  54     void *pcm_buf;
  55     int fd;
  56     int nfrags;
  57     int fragsize;
  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;
 120
 121     qemu_set_fd_handler (*fdp, NULL, NULL, NULL);
 122     err = close (*fdp);
 123     if (err) {
 124         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 125     }
 126     *fdp = -1;
 127 }
 128
 129 static void oss_helper_poll_out (void *opaque)
 130 {
 131     (void) opaque;
 132     audio_run ("oss_poll_out");
 133 }
 134
 135 static void oss_helper_poll_in (void *opaque)
 136 {
 137     (void) opaque;
 138     audio_run ("oss_poll_in");
 139 }
 140
 141 static int oss_poll_out (HWVoiceOut *hw)
 142 {
 143     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 144
 145     return qemu_set_fd_handler (oss->fd, NULL, oss_helper_poll_out, NULL);
 146 }
 147
 148 static int oss_poll_in (HWVoiceIn *hw)
 149 {
 150     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 151
 152     return qemu_set_fd_handler (oss->fd, oss_helper_poll_in, NULL, NULL);
 153 }
 154
 155 static int oss_write (SWVoiceOut *sw, void *buf, int len)
 156 {
 157     return audio_pcm_sw_write (sw, buf, len);
 158 }
 159
 160 static int aud_to_ossfmt (audfmt_e fmt, int endianness)
 161 {
 162     switch (fmt) {
 163     case AUD_FMT_S8:
 164         return AFMT_S8;
 165
 166     case AUD_FMT_U8:
 167         return AFMT_U8;
 168
 169     case AUD_FMT_S16:
 170         if (endianness) {
 171             return AFMT_S16_BE;
 172         }
 173         else {
 174             return AFMT_S16_LE;
 175         }
 176
 177     case AUD_FMT_U16:
 178         if (endianness) {
 179             return AFMT_U16_BE;
 180         }
 181         else {
 182             return AFMT_U16_LE;
 183         }
 184
 185     default:
 186         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 187 #ifdef DEBUG_AUDIO
 188         abort ();
 189 #endif
 190         return AFMT_U8;
 191     }
 192 }
 193
 194 static int oss_to_audfmt (int ossfmt, audfmt_e *fmt, int *endianness)
 195 {
 196     switch (ossfmt) {
 197     case AFMT_S8:
 198         *endianness = 0;
 199         *fmt = AUD_FMT_S8;
 200         break;
 201
 202     case AFMT_U8:
 203         *endianness = 0;
 204         *fmt = AUD_FMT_U8;
 205         break;
 206
 207     case AFMT_S16_LE:
 208         *endianness = 0;
 209         *fmt = AUD_FMT_S16;
 210         break;
 211
 212     case AFMT_U16_LE:
 213         *endianness = 0;
 214         *fmt = AUD_FMT_U16;
 215         break;
 216
 217     case AFMT_S16_BE:
 218         *endianness = 1;
 219         *fmt = AUD_FMT_S16;
 220         break;
 221
 222     case AFMT_U16_BE:
 223         *endianness = 1;
 224         *fmt = AUD_FMT_U16;
 225         break;
 226
 227     default:
 228         dolog ("Unrecognized audio format %d\n", ossfmt);
 229         return -1;
 230     }
 231
 232     return 0;
 233 }
 234
 235 #if defined DEBUG_MISMATCHES || defined DEBUG
 236 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 237 {
 238     dolog ("parameter | requested value | obtained value\n");
 239     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 240     dolog ("channels  |      %10d |     %10d\n",
 241            req->nchannels, obt->nchannels);
 242     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 243     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 244     dolog ("fragsize  |      %10d |     %10d\n",
 245            req->fragsize, obt->fragsize);
 246 }
 247 #endif
 248
 249 #ifdef USE_DSP_POLICY
 250 static int oss_get_version (int fd, int *version, const char *typ)
 251 {
 252     if (ioctl (fd, OSS_GETVERSION, &version)) {
 253 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 254         /*
 255          * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION
 256          * since 7.x, but currently only on the mixer device (or in
 257          * the Linuxolator), and in the native version that part of
 258          * the code is in fact never reached so the ioctl fails anyway.
 259          * Until this is fixed, just check the errno and if its what
 260          * FreeBSD's sound drivers return atm assume they are new enough.
 261          */
 262         if (errno == EINVAL) {
 263             *version = 0x040000;
 264             return 0;
 265         }
 266 #endif
 267         oss_logerr2 (errno, typ, "Failed to get OSS version\n");
 268         return -1;
 269     }
 270     return 0;
 271 }
 272 #endif
 273
 274 static int oss_open (int in, struct oss_params *req,
 275                      struct oss_params *obt, int *pfd)
 276 {
 277     int fd;
 278     int oflags = conf.exclusive ? O_EXCL : 0;
 279     audio_buf_info abinfo;
 280     int fmt, freq, nchannels;
 281     int setfragment = 1;
 282     const char *dspname = in ? conf.devpath_in : conf.devpath_out;
 283     const char *typ = in ? "ADC" : "DAC";
 284
 285     /* Kludge needed to have working mmap on Linux */
 286     oflags |= conf.try_mmap ? O_RDWR : (in ? O_RDONLY : O_WRONLY);
 287
 288     fd = open (dspname, oflags | O_NONBLOCK);
 289     if (-1 == fd) {
 290         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 291         return -1;
 292     }
 293
 294     freq = req->freq;
 295     nchannels = req->nchannels;
 296     fmt = req->fmt;
 297
 298     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 299         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 300         goto err;
 301     }
 302
 303     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 304         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 305                      req->nchannels);
 306         goto err;
 307     }
 308
 309     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 310         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 311         goto err;
 312     }
 313
 314     if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
 315         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 316         goto err;
 317     }
 318
 319 #ifdef USE_DSP_POLICY
 320     if (conf.policy >= 0) {
 321         int version;
 322
 323         if (!oss_get_version (fd, &version, typ)) {
 324             if (conf.debug) {
 325                 dolog ("OSS version = %#x\n", version);
 326             }
 327
 328             if (version >= 0x040000) {
 329                 int policy = conf.policy;
 330                 if (ioctl (fd, SNDCTL_DSP_POLICY, &policy)) {
 331                     oss_logerr2 (errno, typ,
 332                                  "Failed to set timing policy to %d\n",
 333                                  conf.policy);
 334                     goto err;
 335                 }
 336                 setfragment = 0;
 337             }
 338         }
 339     }
 340 #endif
 341
 342     if (setfragment) {
 343         int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
 344         if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 345             oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 346                          req->nfrags, req->fragsize);
 347             goto err;
 348         }
 349     }
 350
 351     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 352         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 353         goto err;
 354     }
 355
 356     if (!abinfo.fragstotal || !abinfo.fragsize) {
 357         AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
 358                  abinfo.fragstotal, abinfo.fragsize, typ);
 359         goto err;
 360     }
 361
 362     obt->fmt = fmt;
 363     obt->nchannels = nchannels;
 364     obt->freq = freq;
 365     obt->nfrags = abinfo.fragstotal;
 366     obt->fragsize = abinfo.fragsize;
 367     *pfd = fd;
 368
 369 #ifdef DEBUG_MISMATCHES
 370     if ((req->fmt != obt->fmt) ||
 371         (req->nchannels != obt->nchannels) ||
 372         (req->freq != obt->freq) ||
 373         (req->fragsize != obt->fragsize) ||
 374         (req->nfrags != obt->nfrags)) {
 375         dolog ("Audio parameters mismatch\n");
 376         oss_dump_info (req, obt);
 377     }
 378 #endif
 379
 380 #ifdef DEBUG
 381     oss_dump_info (req, obt);
 382 #endif
 383     return 0;
 384
 385  err:
 386     oss_anal_close (&fd);
 387     return -1;
 388 }
 389
 390 static void oss_write_pending (OSSVoiceOut *oss)
 391 {
 392     HWVoiceOut *hw = &oss->hw;
 393
 394     if (oss->mmapped) {
 395         return;
 396     }
 397
 398     while (oss->pending) {
 399         int samples_written;
 400         ssize_t bytes_written;
 401         int samples_till_end = hw->samples - oss->wpos;
 402         int samples_to_write = audio_MIN (oss->pending, samples_till_end);
 403         int bytes_to_write = samples_to_write << hw->info.shift;
 404         void *pcm = advance (oss->pcm_buf, oss->wpos << hw->info.shift);
 405
 406         bytes_written = write (oss->fd, pcm, bytes_to_write);
 407         if (bytes_written < 0) {
 408             if (errno != EAGAIN) {
 409                 oss_logerr (errno, "failed to write %d bytes\n",
 410                             bytes_to_write);
 411             }
 412             break;
 413         }
 414
 415         if (bytes_written & hw->info.align) {
 416             dolog ("misaligned write asked for %d, but got %zd\n",
 417                    bytes_to_write, bytes_written);
 418             return;
 419         }
 420
 421         samples_written = bytes_written >> hw->info.shift;
 422         oss->pending -= samples_written;
 423         oss->wpos = (oss->wpos + samples_written) % hw->samples;
 424         if (bytes_written - bytes_to_write) {
 425             break;
 426         }
 427     }
 428 }
 429
 430 static int oss_run_out (HWVoiceOut *hw, int live)
 431 {
 432     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 433     int err, decr;
 434     struct audio_buf_info abinfo;
 435     struct count_info cntinfo;
 436     int bufsize;
 437
 438     bufsize = hw->samples << hw->info.shift;
 439
 440     if (oss->mmapped) {
 441         int bytes, pos;
 442
 443         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 444         if (err < 0) {
 445             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 446             return 0;
 447         }
 448
 449         pos = hw->rpos << hw->info.shift;
 450         bytes = audio_ring_dist (cntinfo.ptr, pos, bufsize);
 451         decr = audio_MIN (bytes >> hw->info.shift, live);
 452     }
 453     else {
 454         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 455         if (err < 0) {
 456             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 457             return 0;
 458         }
 459
 460         if (abinfo.bytes > bufsize) {
 461             if (conf.debug) {
 462                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n"
 463                        "please report your OS/audio hw to av1474@comtv.ru\n",
 464                        abinfo.bytes, bufsize);
 465             }
 466             abinfo.bytes = bufsize;
 467         }
 468
 469         if (abinfo.bytes < 0) {
 470             if (conf.debug) {
 471                 dolog ("warning: Invalid available size, size=%d bufsize=%d\n",
 472                        abinfo.bytes, bufsize);
 473             }
 474             return 0;
 475         }
 476
 477         decr = audio_MIN (abinfo.bytes >> hw->info.shift, live);
 478         if (!decr) {
 479             return 0;
 480         }
 481     }
 482
 483     decr = audio_pcm_hw_clip_out (hw, oss->pcm_buf, decr, oss->pending);
 484     oss->pending += decr;
 485     oss_write_pending (oss);
 486
 487     return decr;
 488 }
 489
 490 static void oss_fini_out (HWVoiceOut *hw)
 491 {
 492     int err;
 493     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 494
 495     ldebug ("oss_fini\n");
 496     oss_anal_close (&oss->fd);
 497
 498     if (oss->pcm_buf) {
 499         if (oss->mmapped) {
 500             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 501             if (err) {
 502                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 503                             oss->pcm_buf, hw->samples << hw->info.shift);
 504             }
 505         }
 506         else {
 507             g_free (oss->pcm_buf);
 508         }
 509         oss->pcm_buf = NULL;
 510     }
 511 }
 512
 513 static int oss_init_out (HWVoiceOut *hw, struct audsettings *as)
 514 {
 515     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 516     struct oss_params req, obt;
 517     int endianness;
 518     int err;
 519     int fd;
 520     audfmt_e effective_fmt;
 521     struct audsettings obt_as;
 522
 523     oss->fd = -1;
 524
 525     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 526     req.freq = as->freq;
 527     req.nchannels = as->nchannels;
 528     req.fragsize = conf.fragsize;
 529     req.nfrags = conf.nfrags;
 530
 531     if (oss_open (0, &req, &obt, &fd)) {
 532         return -1;
 533     }
 534
 535     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 536     if (err) {
 537         oss_anal_close (&fd);
 538         return -1;
 539     }
 540
 541     obt_as.freq = obt.freq;
 542     obt_as.nchannels = obt.nchannels;
 543     obt_as.fmt = effective_fmt;
 544     obt_as.endianness = endianness;
 545
 546     audio_pcm_init_info (&hw->info, &obt_as);
 547     oss->nfrags = obt.nfrags;
 548     oss->fragsize = obt.fragsize;
 549
 550     if (obt.nfrags * obt.fragsize & hw->info.align) {
 551         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 552                obt.nfrags * obt.fragsize, hw->info.align + 1);
 553     }
 554
 555     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 556
 557     oss->mmapped = 0;
 558     if (conf.try_mmap) {
 559         oss->pcm_buf = mmap (
 560             NULL,
 561             hw->samples << hw->info.shift,
 562             PROT_READ | PROT_WRITE,
 563             MAP_SHARED,
 564             fd,
 565             0
 566             );
 567         if (oss->pcm_buf == MAP_FAILED) {
 568             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 569                         hw->samples << hw->info.shift);
 570         }
 571         else {
 572             int err;
 573             int trig = 0;
 574             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 575                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 576             }
 577             else {
 578                 trig = PCM_ENABLE_OUTPUT;
 579                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 580                     oss_logerr (
 581                         errno,
 582                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 583                         );
 584                 }
 585                 else {
 586                     oss->mmapped = 1;
 587                 }
 588             }
 589
 590             if (!oss->mmapped) {
 591                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 592                 if (err) {
 593                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 594                                 oss->pcm_buf, hw->samples << hw->info.shift);
 595                 }
 596             }
 597         }
 598     }
 599
 600     if (!oss->mmapped) {
 601         oss->pcm_buf = audio_calloc (
 602             AUDIO_FUNC,
 603             hw->samples,
 604             1 << hw->info.shift
 605             );
 606         if (!oss->pcm_buf) {
 607             dolog (
 608                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 609                 hw->samples,
 610                 1 << hw->info.shift
 611                 );
 612             oss_anal_close (&fd);
 613             return -1;
 614         }
 615     }
 616
 617     oss->fd = fd;
 618     return 0;
 619 }
 620
 621 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 622 {
 623     int trig;
 624     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 625
 626     switch (cmd) {
 627     case VOICE_ENABLE:
 628         {
 629             va_list ap;
 630             int poll_mode;
 631
 632             va_start (ap, cmd);
 633             poll_mode = va_arg (ap, int);
 634             va_end (ap);
 635
 636             ldebug ("enabling voice\n");
 637             if (poll_mode && oss_poll_out (hw)) {
 638                 poll_mode = 0;
 639             }
 640             hw->poll_mode = poll_mode;
 641
 642             if (!oss->mmapped) {
 643                 return 0;
 644             }
 645
 646             audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 647             trig = PCM_ENABLE_OUTPUT;
 648             if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 649                 oss_logerr (
 650                     errno,
 651                     "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 652                     );
 653                 return -1;
 654             }
 655         }
 656         break;
 657
 658     case VOICE_DISABLE:
 659         if (hw->poll_mode) {
 660             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 661             hw->poll_mode = 0;
 662         }
 663
 664         if (!oss->mmapped) {
 665             return 0;
 666         }
 667
 668         ldebug ("disabling voice\n");
 669         trig = 0;
 670         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 671             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 672             return -1;
 673         }
 674         break;
 675     }
 676     return 0;
 677 }
 678
 679 static int oss_init_in (HWVoiceIn *hw, struct audsettings *as)
 680 {
 681     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 682     struct oss_params req, obt;
 683     int endianness;
 684     int err;
 685     int fd;
 686     audfmt_e effective_fmt;
 687     struct audsettings obt_as;
 688
 689     oss->fd = -1;
 690
 691     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 692     req.freq = as->freq;
 693     req.nchannels = as->nchannels;
 694     req.fragsize = conf.fragsize;
 695     req.nfrags = conf.nfrags;
 696     if (oss_open (1, &req, &obt, &fd)) {
 697         return -1;
 698     }
 699
 700     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 701     if (err) {
 702         oss_anal_close (&fd);
 703         return -1;
 704     }
 705
 706     obt_as.freq = obt.freq;
 707     obt_as.nchannels = obt.nchannels;
 708     obt_as.fmt = effective_fmt;
 709     obt_as.endianness = endianness;
 710
 711     audio_pcm_init_info (&hw->info, &obt_as);
 712     oss->nfrags = obt.nfrags;
 713     oss->fragsize = obt.fragsize;
 714
 715     if (obt.nfrags * obt.fragsize & hw->info.align) {
 716         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 717                obt.nfrags * obt.fragsize, hw->info.align + 1);
 718     }
 719
 720     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 721     oss->pcm_buf = audio_calloc (AUDIO_FUNC, hw->samples, 1 << hw->info.shift);
 722     if (!oss->pcm_buf) {
 723         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 724                hw->samples, 1 << hw->info.shift);
 725         oss_anal_close (&fd);
 726         return -1;
 727     }
 728
 729     oss->fd = fd;
 730     return 0;
 731 }
 732
 733 static void oss_fini_in (HWVoiceIn *hw)
 734 {
 735     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 736
 737     oss_anal_close (&oss->fd);
 738
 739     g_free(oss->pcm_buf);
 740     oss->pcm_buf = NULL;
 741 }
 742
 743 static int oss_run_in (HWVoiceIn *hw)
 744 {
 745     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 746     int hwshift = hw->info.shift;
 747     int i;
 748     int live = audio_pcm_hw_get_live_in (hw);
 749     int dead = hw->samples - live;
 750     size_t read_samples = 0;
 751     struct {
 752         int add;
 753         int len;
 754     } bufs[2] = {
 755         { .add = hw->wpos, .len = 0 },
 756         { .add = 0,        .len = 0 }
 757     };
 758
 759     if (!dead) {
 760         return 0;
 761     }
 762
 763     if (hw->wpos + dead > hw->samples) {
 764         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 765         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 766     }
 767     else {
 768         bufs[0].len = dead << hwshift;
 769     }
 770
 771     for (i = 0; i < 2; ++i) {
 772         ssize_t nread;
 773
 774         if (bufs[i].len) {
 775             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 776             nread = read (oss->fd, p, bufs[i].len);
 777
 778             if (nread > 0) {
 779                 if (nread & hw->info.align) {
 780                     dolog ("warning: Misaligned read %zd (requested %d), "
 781                            "alignment %d\n", nread, bufs[i].add << hwshift,
 782                            hw->info.align + 1);
 783                 }
 784                 read_samples += nread >> hwshift;
 785                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift);
 786             }
 787
 788             if (bufs[i].len - nread) {
 789                 if (nread == -1) {
 790                     switch (errno) {
 791                     case EINTR:
 792                     case EAGAIN:
 793                         break;
 794                     default:
 795                         oss_logerr (
 796                             errno,
 797                             "Failed to read %d bytes of audio (to %p)\n",
 798                             bufs[i].len, p
 799                             );
 800                         break;
 801                     }
 802                 }
 803                 break;
 804             }
 805         }
 806     }
 807
 808     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 809     return read_samples;
 810 }
 811
 812 static int oss_read (SWVoiceIn *sw, void *buf, int size)
 813 {
 814     return audio_pcm_sw_read (sw, buf, size);
 815 }
 816
 817 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 818 {
 819     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 820
 821     switch (cmd) {
 822     case VOICE_ENABLE:
 823         {
 824             va_list ap;
 825             int poll_mode;
 826
 827             va_start (ap, cmd);
 828             poll_mode = va_arg (ap, int);
 829             va_end (ap);
 830
 831             if (poll_mode && oss_poll_in (hw)) {
 832                 poll_mode = 0;
 833             }
 834             hw->poll_mode = poll_mode;
 835         }
 836         break;
 837
 838     case VOICE_DISABLE:
 839         if (hw->poll_mode) {
 840             hw->poll_mode = 0;
 841             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 842         }
 843         break;
 844     }
 845     return 0;
 846 }
 847
 848 static void *oss_audio_init (void)
 849 {
 850     if (access(conf.devpath_in, R_OK | W_OK) < 0 ||
 851         access(conf.devpath_out, R_OK | W_OK) < 0) {
 852         return NULL;
 853     }
 854     return &conf;
 855 }
 856
 857 static void oss_audio_fini (void *opaque)
 858 {
 859     (void) opaque;
 860 }
 861
 862 static struct audio_option oss_options[] = {
 863     {
 864         .name  = "FRAGSIZE",
 865         .tag   = AUD_OPT_INT,
 866         .valp  = &conf.fragsize,
 867         .descr = "Fragment size in bytes"
 868     },
 869     {
 870         .name  = "NFRAGS",
 871         .tag   = AUD_OPT_INT,
 872         .valp  = &conf.nfrags,
 873         .descr = "Number of fragments"
 874     },
 875     {
 876         .name  = "MMAP",
 877         .tag   = AUD_OPT_BOOL,
 878         .valp  = &conf.try_mmap,
 879         .descr = "Try using memory mapped access"
 880     },
 881     {
 882         .name  = "DAC_DEV",
 883         .tag   = AUD_OPT_STR,
 884         .valp  = &conf.devpath_out,
 885         .descr = "Path to DAC device"
 886     },
 887     {
 888         .name  = "ADC_DEV",
 889         .tag   = AUD_OPT_STR,
 890         .valp  = &conf.devpath_in,
 891         .descr = "Path to ADC device"
 892     },
 893     {
 894         .name  = "EXCLUSIVE",
 895         .tag   = AUD_OPT_BOOL,
 896         .valp  = &conf.exclusive,
 897         .descr = "Open device in exclusive mode (vmix wont work)"
 898     },
 899 #ifdef USE_DSP_POLICY
 900     {
 901         .name  = "POLICY",
 902         .tag   = AUD_OPT_INT,
 903         .valp  = &conf.policy,
 904         .descr = "Set the timing policy of the device, -1 to use fragment mode",
 905     },
 906 #endif
 907     {
 908         .name  = "DEBUG",
 909         .tag   = AUD_OPT_BOOL,
 910         .valp  = &conf.debug,
 911         .descr = "Turn on some debugging messages"
 912     },
 913     { /* End of list */ }
 914 };
 915
 916 static struct audio_pcm_ops oss_pcm_ops = {
 917     .init_out = oss_init_out,
 918     .fini_out = oss_fini_out,
 919     .run_out  = oss_run_out,
 920     .write    = oss_write,
 921     .ctl_out  = oss_ctl_out,
 922
 923     .init_in  = oss_init_in,
 924     .fini_in  = oss_fini_in,
 925     .run_in   = oss_run_in,
 926     .read     = oss_read,
 927     .ctl_in   = oss_ctl_in
 928 };
 929
 930 struct audio_driver oss_audio_driver = {
 931     .name           = "oss",
 932     .descr          = "OSS http://www.opensound.com",
 933     .options        = oss_options,
 934     .init           = oss_audio_init,
 935     .fini           = oss_audio_fini,
 936     .pcm_ops        = &oss_pcm_ops,
 937     .can_be_default = 1,
 938     .max_voices_out = INT_MAX,
 939     .max_voices_in  = INT_MAX,
 940     .voice_size_out = sizeof (OSSVoiceOut),
 941     .voice_size_in  = sizeof (OSSVoiceIn)
 942 };