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
  25 #include "qemu/osdep.h"
  26 #include <sys/ioctl.h>
  27 #include <sys/soundcard.h>
  28 #include "qemu/main-loop.h"
  29 #include "qemu/module.h"
  30 #include "qemu/host-utils.h"
  31 #include "audio.h"
  32 #include "trace.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     int fd;
  44     int nfrags;
  45     int fragsize;
  46     int mmapped;
  47     Audiodev *dev;
  48 } OSSVoiceOut;
  49
  50 typedef struct OSSVoiceIn {
  51     HWVoiceIn hw;
  52     int fd;
  53     int nfrags;
  54     int fragsize;
  55     Audiodev *dev;
  56 } OSSVoiceIn;
  57
  58 struct oss_params {
  59     int freq;
  60     int fmt;
  61     int nchannels;
  62     int nfrags;
  63     int fragsize;
  64 };
  65
  66 static void G_GNUC_PRINTF (2, 3) oss_logerr (int err, const char *fmt, ...)
  67 {
  68     va_list ap;
  69
  70     va_start (ap, fmt);
  71     AUD_vlog (AUDIO_CAP, fmt, ap);
  72     va_end (ap);
  73
  74     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
  75 }
  76
  77 static void G_GNUC_PRINTF (3, 4) oss_logerr2 (
  78     int err,
  79     const char *typ,
  80     const char *fmt,
  81     ...
  82     )
  83 {
  84     va_list ap;
  85
  86     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
  87
  88     va_start (ap, fmt);
  89     AUD_vlog (AUDIO_CAP, fmt, ap);
  90     va_end (ap);
  91
  92     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
  93 }
  94
  95 static void oss_anal_close (int *fdp)
  96 {
  97     int err;
  98
  99     qemu_set_fd_handler (*fdp, NULL, NULL, NULL);
 100     err = close (*fdp);
 101     if (err) {
 102         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 103     }
 104     *fdp = -1;
 105 }
 106
 107 static void oss_helper_poll_out (void *opaque)
 108 {
 109     AudioState *s = opaque;
 110     audio_run(s, "oss_poll_out");
 111 }
 112
 113 static void oss_helper_poll_in (void *opaque)
 114 {
 115     AudioState *s = opaque;
 116     audio_run(s, "oss_poll_in");
 117 }
 118
 119 static void oss_poll_out (HWVoiceOut *hw)
 120 {
 121     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 122
 123     qemu_set_fd_handler(oss->fd, NULL, oss_helper_poll_out, hw->s);
 124 }
 125
 126 static void oss_poll_in (HWVoiceIn *hw)
 127 {
 128     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 129
 130     qemu_set_fd_handler(oss->fd, oss_helper_poll_in, NULL, hw->s);
 131 }
 132
 133 static int aud_to_ossfmt (AudioFormat fmt, int endianness)
 134 {
 135     switch (fmt) {
 136     case AUDIO_FORMAT_S8:
 137         return AFMT_S8;
 138
 139     case AUDIO_FORMAT_U8:
 140         return AFMT_U8;
 141
 142     case AUDIO_FORMAT_S16:
 143         if (endianness) {
 144             return AFMT_S16_BE;
 145         } else {
 146             return AFMT_S16_LE;
 147         }
 148
 149     case AUDIO_FORMAT_U16:
 150         if (endianness) {
 151             return AFMT_U16_BE;
 152         } else {
 153             return AFMT_U16_LE;
 154         }
 155
 156     default:
 157         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 158 #ifdef DEBUG_AUDIO
 159         abort ();
 160 #endif
 161         return AFMT_U8;
 162     }
 163 }
 164
 165 static int oss_to_audfmt (int ossfmt, AudioFormat *fmt, int *endianness)
 166 {
 167     switch (ossfmt) {
 168     case AFMT_S8:
 169         *endianness = 0;
 170         *fmt = AUDIO_FORMAT_S8;
 171         break;
 172
 173     case AFMT_U8:
 174         *endianness = 0;
 175         *fmt = AUDIO_FORMAT_U8;
 176         break;
 177
 178     case AFMT_S16_LE:
 179         *endianness = 0;
 180         *fmt = AUDIO_FORMAT_S16;
 181         break;
 182
 183     case AFMT_U16_LE:
 184         *endianness = 0;
 185         *fmt = AUDIO_FORMAT_U16;
 186         break;
 187
 188     case AFMT_S16_BE:
 189         *endianness = 1;
 190         *fmt = AUDIO_FORMAT_S16;
 191         break;
 192
 193     case AFMT_U16_BE:
 194         *endianness = 1;
 195         *fmt = AUDIO_FORMAT_U16;
 196         break;
 197
 198     default:
 199         dolog ("Unrecognized audio format %d\n", ossfmt);
 200         return -1;
 201     }
 202
 203     return 0;
 204 }
 205
 206 #if defined DEBUG_MISMATCHES || defined DEBUG
 207 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 208 {
 209     dolog ("parameter | requested value | obtained value\n");
 210     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 211     dolog ("channels  |      %10d |     %10d\n",
 212            req->nchannels, obt->nchannels);
 213     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 214     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 215     dolog ("fragsize  |      %10d |     %10d\n",
 216            req->fragsize, obt->fragsize);
 217 }
 218 #endif
 219
 220 #ifdef USE_DSP_POLICY
 221 static int oss_get_version (int fd, int *version, const char *typ)
 222 {
 223     if (ioctl (fd, OSS_GETVERSION, &version)) {
 224 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 225         /*
 226          * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION
 227          * since 7.x, but currently only on the mixer device (or in
 228          * the Linuxolator), and in the native version that part of
 229          * the code is in fact never reached so the ioctl fails anyway.
 230          * Until this is fixed, just check the errno and if its what
 231          * FreeBSD's sound drivers return atm assume they are new enough.
 232          */
 233         if (errno == EINVAL) {
 234             *version = 0x040000;
 235             return 0;
 236         }
 237 #endif
 238         oss_logerr2 (errno, typ, "Failed to get OSS version\n");
 239         return -1;
 240     }
 241     return 0;
 242 }
 243 #endif
 244
 245 static int oss_open(int in, struct oss_params *req, audsettings *as,
 246                     struct oss_params *obt, int *pfd, Audiodev *dev)
 247 {
 248     AudiodevOssOptions *oopts = &dev->u.oss;
 249     AudiodevOssPerDirectionOptions *opdo = in ? oopts->in : oopts->out;
 250     int fd;
 251     int oflags = (oopts->has_exclusive && oopts->exclusive) ? O_EXCL : 0;
 252     audio_buf_info abinfo;
 253     int fmt, freq, nchannels;
 254     int setfragment = 1;
 255     const char *dspname = opdo->has_dev ? opdo->dev : "/dev/dsp";
 256     const char *typ = in ? "ADC" : "DAC";
 257 #ifdef USE_DSP_POLICY
 258     int policy = oopts->has_dsp_policy ? oopts->dsp_policy : 5;
 259 #endif
 260
 261     /* Kludge needed to have working mmap on Linux */
 262     oflags |= (oopts->has_try_mmap && oopts->try_mmap) ?
 263         O_RDWR : (in ? O_RDONLY : O_WRONLY);
 264
 265     fd = open (dspname, oflags | O_NONBLOCK);
 266     if (-1 == fd) {
 267         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 268         return -1;
 269     }
 270
 271     freq = req->freq;
 272     nchannels = req->nchannels;
 273     fmt = req->fmt;
 274     req->nfrags = opdo->has_buffer_count ? opdo->buffer_count : 4;
 275     req->fragsize = audio_buffer_bytes(
 276         qapi_AudiodevOssPerDirectionOptions_base(opdo), as, 23220);
 277
 278     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 279         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 280         goto err;
 281     }
 282
 283     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 284         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 285                      req->nchannels);
 286         goto err;
 287     }
 288
 289     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 290         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 291         goto err;
 292     }
 293
 294     if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
 295         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 296         goto err;
 297     }
 298
 299 #ifdef USE_DSP_POLICY
 300     if (policy >= 0) {
 301         int version;
 302
 303         if (!oss_get_version (fd, &version, typ)) {
 304             trace_oss_version(version);
 305
 306             if (version >= 0x040000) {
 307                 int policy2 = policy;
 308                 if (ioctl(fd, SNDCTL_DSP_POLICY, &policy2)) {
 309                     oss_logerr2 (errno, typ,
 310                                  "Failed to set timing policy to %d\n",
 311                                  policy);
 312                     goto err;
 313                 }
 314                 setfragment = 0;
 315             }
 316         }
 317     }
 318 #endif
 319
 320     if (setfragment) {
 321         int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
 322         if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 323             oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 324                          req->nfrags, req->fragsize);
 325             goto err;
 326         }
 327     }
 328
 329     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 330         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 331         goto err;
 332     }
 333
 334     if (!abinfo.fragstotal || !abinfo.fragsize) {
 335         AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
 336                  abinfo.fragstotal, abinfo.fragsize, typ);
 337         goto err;
 338     }
 339
 340     obt->fmt = fmt;
 341     obt->nchannels = nchannels;
 342     obt->freq = freq;
 343     obt->nfrags = abinfo.fragstotal;
 344     obt->fragsize = abinfo.fragsize;
 345     *pfd = fd;
 346
 347 #ifdef DEBUG_MISMATCHES
 348     if ((req->fmt != obt->fmt) ||
 349         (req->nchannels != obt->nchannels) ||
 350         (req->freq != obt->freq) ||
 351         (req->fragsize != obt->fragsize) ||
 352         (req->nfrags != obt->nfrags)) {
 353         dolog ("Audio parameters mismatch\n");
 354         oss_dump_info (req, obt);
 355     }
 356 #endif
 357
 358 #ifdef DEBUG
 359     oss_dump_info (req, obt);
 360 #endif
 361     return 0;
 362
 363  err:
 364     oss_anal_close (&fd);
 365     return -1;
 366 }
 367
 368 static size_t oss_get_available_bytes(OSSVoiceOut *oss)
 369 {
 370     int err;
 371     struct count_info cntinfo;
 372     assert(oss->mmapped);
 373
 374     err = ioctl(oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 375     if (err < 0) {
 376         oss_logerr(errno, "SNDCTL_DSP_GETOPTR failed\n");
 377         return 0;
 378     }
 379
 380     return audio_ring_dist(cntinfo.ptr, oss->hw.pos_emul, oss->hw.size_emul);
 381 }
 382
 383 static void oss_run_buffer_out(HWVoiceOut *hw)
 384 {
 385     OSSVoiceOut *oss = (OSSVoiceOut *)hw;
 386
 387     if (!oss->mmapped) {
 388         audio_generic_run_buffer_out(hw);
 389     }
 390 }
 391
 392 static size_t oss_buffer_get_free(HWVoiceOut *hw)
 393 {
 394     OSSVoiceOut *oss = (OSSVoiceOut *)hw;
 395
 396     if (oss->mmapped) {
 397         return oss_get_available_bytes(oss);
 398     } else {
 399         return audio_generic_buffer_get_free(hw);
 400     }
 401 }
 402
 403 static void *oss_get_buffer_out(HWVoiceOut *hw, size_t *size)
 404 {
 405     OSSVoiceOut *oss = (OSSVoiceOut *)hw;
 406
 407     if (oss->mmapped) {
 408         *size = hw->size_emul - hw->pos_emul;
 409         return hw->buf_emul + hw->pos_emul;
 410     } else {
 411         return audio_generic_get_buffer_out(hw, size);
 412     }
 413 }
 414
 415 static size_t oss_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size)
 416 {
 417     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 418     if (oss->mmapped) {
 419         assert(buf == hw->buf_emul + hw->pos_emul && size < hw->size_emul);
 420
 421         hw->pos_emul = (hw->pos_emul + size) % hw->size_emul;
 422         return size;
 423     } else {
 424         return audio_generic_put_buffer_out(hw, buf, size);
 425     }
 426 }
 427
 428 static size_t oss_write(HWVoiceOut *hw, void *buf, size_t len)
 429 {
 430     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 431     size_t pos;
 432
 433     if (oss->mmapped) {
 434         size_t total_len;
 435         len = MIN(len, oss_get_available_bytes(oss));
 436
 437         total_len = len;
 438         while (len) {
 439             size_t to_copy = MIN(len, hw->size_emul - hw->pos_emul);
 440             memcpy(hw->buf_emul + hw->pos_emul, buf, to_copy);
 441
 442             hw->pos_emul = (hw->pos_emul + to_copy) % hw->size_emul;
 443             buf += to_copy;
 444             len -= to_copy;
 445         }
 446         return total_len;
 447     }
 448
 449     pos = 0;
 450     while (len) {
 451         ssize_t bytes_written;
 452         void *pcm = advance(buf, pos);
 453
 454         bytes_written = write(oss->fd, pcm, len);
 455         if (bytes_written < 0) {
 456             if (errno != EAGAIN) {
 457                 oss_logerr(errno, "failed to write %zu bytes\n",
 458                            len);
 459             }
 460             return pos;
 461         }
 462
 463         pos += bytes_written;
 464         if (bytes_written < len) {
 465             break;
 466         }
 467         len -= bytes_written;
 468     }
 469     return pos;
 470 }
 471
 472 static void oss_fini_out (HWVoiceOut *hw)
 473 {
 474     int err;
 475     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 476
 477     ldebug ("oss_fini\n");
 478     oss_anal_close (&oss->fd);
 479
 480     if (oss->mmapped && hw->buf_emul) {
 481         err = munmap(hw->buf_emul, hw->size_emul);
 482         if (err) {
 483             oss_logerr(errno, "Failed to unmap buffer %p, size %zu\n",
 484                        hw->buf_emul, hw->size_emul);
 485         }
 486         hw->buf_emul = NULL;
 487     }
 488 }
 489
 490 static int oss_init_out(HWVoiceOut *hw, struct audsettings *as,
 491                         void *drv_opaque)
 492 {
 493     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 494     struct oss_params req, obt;
 495     int endianness;
 496     int err;
 497     int fd;
 498     AudioFormat effective_fmt;
 499     struct audsettings obt_as;
 500     Audiodev *dev = drv_opaque;
 501     AudiodevOssOptions *oopts = &dev->u.oss;
 502
 503     oss->fd = -1;
 504
 505     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 506     req.freq = as->freq;
 507     req.nchannels = as->nchannels;
 508
 509     if (oss_open(0, &req, as, &obt, &fd, dev)) {
 510         return -1;
 511     }
 512
 513     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 514     if (err) {
 515         oss_anal_close (&fd);
 516         return -1;
 517     }
 518
 519     obt_as.freq = obt.freq;
 520     obt_as.nchannels = obt.nchannels;
 521     obt_as.fmt = effective_fmt;
 522     obt_as.endianness = endianness;
 523
 524     audio_pcm_init_info (&hw->info, &obt_as);
 525     oss->nfrags = obt.nfrags;
 526     oss->fragsize = obt.fragsize;
 527
 528     if (obt.nfrags * obt.fragsize % hw->info.bytes_per_frame) {
 529         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 530                obt.nfrags * obt.fragsize, hw->info.bytes_per_frame);
 531     }
 532
 533     hw->samples = (obt.nfrags * obt.fragsize) / hw->info.bytes_per_frame;
 534
 535     oss->mmapped = 0;
 536     if (oopts->has_try_mmap && oopts->try_mmap) {
 537         hw->size_emul = hw->samples * hw->info.bytes_per_frame;
 538         hw->buf_emul = mmap(
 539             NULL,
 540             hw->size_emul,
 541             PROT_READ | PROT_WRITE,
 542             MAP_SHARED,
 543             fd,
 544             0
 545             );
 546         if (hw->buf_emul == MAP_FAILED) {
 547             oss_logerr(errno, "Failed to map %zu bytes of DAC\n",
 548                        hw->size_emul);
 549             hw->buf_emul = NULL;
 550         } else {
 551             int err;
 552             int trig = 0;
 553             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 554                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 555             } else {
 556                 trig = PCM_ENABLE_OUTPUT;
 557                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 558                     oss_logerr (
 559                         errno,
 560                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 561                         );
 562                 } else {
 563                     oss->mmapped = 1;
 564                 }
 565             }
 566
 567             if (!oss->mmapped) {
 568                 err = munmap(hw->buf_emul, hw->size_emul);
 569                 if (err) {
 570                     oss_logerr(errno, "Failed to unmap buffer %p size %zu\n",
 571                                hw->buf_emul, hw->size_emul);
 572                 }
 573                 hw->buf_emul = NULL;
 574             }
 575         }
 576     }
 577
 578     oss->fd = fd;
 579     oss->dev = dev;
 580     return 0;
 581 }
 582
 583 static void oss_enable_out(HWVoiceOut *hw, bool enable)
 584 {
 585     int trig;
 586     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 587     AudiodevOssPerDirectionOptions *opdo = oss->dev->u.oss.out;
 588
 589     if (enable) {
 590         hw->poll_mode = opdo->try_poll;
 591
 592         ldebug("enabling voice\n");
 593         if (hw->poll_mode) {
 594             oss_poll_out(hw);
 595         }
 596
 597         if (!oss->mmapped) {
 598             return;
 599         }
 600
 601         audio_pcm_info_clear_buf(&hw->info, hw->buf_emul, hw->samples);
 602         trig = PCM_ENABLE_OUTPUT;
 603         if (ioctl(oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 604             oss_logerr(errno,
 605                        "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n");
 606             return;
 607         }
 608     } else {
 609         if (hw->poll_mode) {
 610             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 611             hw->poll_mode = 0;
 612         }
 613
 614         if (!oss->mmapped) {
 615             return;
 616         }
 617
 618         ldebug ("disabling voice\n");
 619         trig = 0;
 620         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 621             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 622             return;
 623         }
 624     }
 625 }
 626
 627 static int oss_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
 628 {
 629     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 630     struct oss_params req, obt;
 631     int endianness;
 632     int err;
 633     int fd;
 634     AudioFormat effective_fmt;
 635     struct audsettings obt_as;
 636     Audiodev *dev = drv_opaque;
 637
 638     oss->fd = -1;
 639
 640     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 641     req.freq = as->freq;
 642     req.nchannels = as->nchannels;
 643     if (oss_open(1, &req, as, &obt, &fd, dev)) {
 644         return -1;
 645     }
 646
 647     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 648     if (err) {
 649         oss_anal_close (&fd);
 650         return -1;
 651     }
 652
 653     obt_as.freq = obt.freq;
 654     obt_as.nchannels = obt.nchannels;
 655     obt_as.fmt = effective_fmt;
 656     obt_as.endianness = endianness;
 657
 658     audio_pcm_init_info (&hw->info, &obt_as);
 659     oss->nfrags = obt.nfrags;
 660     oss->fragsize = obt.fragsize;
 661
 662     if (obt.nfrags * obt.fragsize % hw->info.bytes_per_frame) {
 663         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 664                obt.nfrags * obt.fragsize, hw->info.bytes_per_frame);
 665     }
 666
 667     hw->samples = (obt.nfrags * obt.fragsize) / hw->info.bytes_per_frame;
 668
 669     oss->fd = fd;
 670     oss->dev = dev;
 671     return 0;
 672 }
 673
 674 static void oss_fini_in (HWVoiceIn *hw)
 675 {
 676     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 677
 678     oss_anal_close (&oss->fd);
 679 }
 680
 681 static size_t oss_read(HWVoiceIn *hw, void *buf, size_t len)
 682 {
 683     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 684     size_t pos = 0;
 685
 686     while (len) {
 687         ssize_t nread;
 688
 689         void *dst = advance(buf, pos);
 690         nread = read(oss->fd, dst, len);
 691
 692         if (nread == -1) {
 693             switch (errno) {
 694             case EINTR:
 695             case EAGAIN:
 696                 break;
 697             default:
 698                 oss_logerr(errno, "Failed to read %zu bytes of audio (to %p)\n",
 699                            len, dst);
 700                 break;
 701             }
 702             break;
 703         }
 704
 705         pos += nread;
 706         len -= nread;
 707     }
 708
 709     return pos;
 710 }
 711
 712 static void oss_enable_in(HWVoiceIn *hw, bool enable)
 713 {
 714     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 715     AudiodevOssPerDirectionOptions *opdo = oss->dev->u.oss.out;
 716
 717     if (enable) {
 718         hw->poll_mode = opdo->try_poll;
 719
 720         if (hw->poll_mode) {
 721             oss_poll_in(hw);
 722         }
 723     } else {
 724         if (hw->poll_mode) {
 725             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 726             hw->poll_mode = 0;
 727         }
 728     }
 729 }
 730
 731 static void oss_init_per_direction(AudiodevOssPerDirectionOptions *opdo)
 732 {
 733     if (!opdo->has_try_poll) {
 734         opdo->try_poll = true;
 735         opdo->has_try_poll = true;
 736     }
 737 }
 738
 739 static void *oss_audio_init(Audiodev *dev)
 740 {
 741     AudiodevOssOptions *oopts;
 742     assert(dev->driver == AUDIODEV_DRIVER_OSS);
 743
 744     oopts = &dev->u.oss;
 745     oss_init_per_direction(oopts->in);
 746     oss_init_per_direction(oopts->out);
 747
 748     if (access(oopts->in->has_dev ? oopts->in->dev : "/dev/dsp",
 749                R_OK | W_OK) < 0 ||
 750         access(oopts->out->has_dev ? oopts->out->dev : "/dev/dsp",
 751                R_OK | W_OK) < 0) {
 752         return NULL;
 753     }
 754     return dev;
 755 }
 756
 757 static void oss_audio_fini (void *opaque)
 758 {
 759 }
 760
 761 static struct audio_pcm_ops oss_pcm_ops = {
 762     .init_out = oss_init_out,
 763     .fini_out = oss_fini_out,
 764     .write    = oss_write,
 765     .buffer_get_free = oss_buffer_get_free,
 766     .run_buffer_out = oss_run_buffer_out,
 767     .get_buffer_out = oss_get_buffer_out,
 768     .put_buffer_out = oss_put_buffer_out,
 769     .enable_out = oss_enable_out,
 770
 771     .init_in  = oss_init_in,
 772     .fini_in  = oss_fini_in,
 773     .read     = oss_read,
 774     .run_buffer_in = audio_generic_run_buffer_in,
 775     .enable_in = oss_enable_in
 776 };
 777
 778 static struct audio_driver oss_audio_driver = {
 779     .name           = "oss",
 780     .descr          = "OSS http://www.opensound.com",
 781     .init           = oss_audio_init,
 782     .fini           = oss_audio_fini,
 783     .pcm_ops        = &oss_pcm_ops,
 784     .can_be_default = 1,
 785     .max_voices_out = INT_MAX,
 786     .max_voices_in  = INT_MAX,
 787     .voice_size_out = sizeof (OSSVoiceOut),
 788     .voice_size_in  = sizeof (OSSVoiceIn)
 789 };
 790
 791 static void register_audio_oss(void)
 792 {
 793     audio_driver_register(&oss_audio_driver);
 794 }
 795 type_init(register_audio_oss);