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 GCC_FMT_ATTR (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 GCC_FMT_ATTR (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 void *oss_get_buffer_out(HWVoiceOut *hw, size_t *size)
 393 {
 394     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 395     if (oss->mmapped) {
 396         *size = MIN(oss_get_available_bytes(oss), hw->size_emul - hw->pos_emul);
 397         return hw->buf_emul + hw->pos_emul;
 398     } else {
 399         return audio_generic_get_buffer_out(hw, size);
 400     }
 401 }
 402
 403 static size_t oss_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size)
 404 {
 405     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 406     if (oss->mmapped) {
 407         assert(buf == hw->buf_emul + hw->pos_emul && size < hw->size_emul);
 408
 409         hw->pos_emul = (hw->pos_emul + size) % hw->size_emul;
 410         return size;
 411     } else {
 412         return audio_generic_put_buffer_out(hw, buf, size);
 413     }
 414 }
 415
 416 static size_t oss_write(HWVoiceOut *hw, void *buf, size_t len)
 417 {
 418     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 419     size_t pos;
 420
 421     if (oss->mmapped) {
 422         size_t total_len;
 423         len = MIN(len, oss_get_available_bytes(oss));
 424
 425         total_len = len;
 426         while (len) {
 427             size_t to_copy = MIN(len, hw->size_emul - hw->pos_emul);
 428             memcpy(hw->buf_emul + hw->pos_emul, buf, to_copy);
 429
 430             hw->pos_emul = (hw->pos_emul + to_copy) % hw->size_emul;
 431             buf += to_copy;
 432             len -= to_copy;
 433         }
 434         return total_len;
 435     }
 436
 437     pos = 0;
 438     while (len) {
 439         ssize_t bytes_written;
 440         void *pcm = advance(buf, pos);
 441
 442         bytes_written = write(oss->fd, pcm, len);
 443         if (bytes_written < 0) {
 444             if (errno != EAGAIN) {
 445                 oss_logerr(errno, "failed to write %zu bytes\n",
 446                            len);
 447             }
 448             return pos;
 449         }
 450
 451         pos += bytes_written;
 452         if (bytes_written < len) {
 453             break;
 454         }
 455         len -= bytes_written;
 456     }
 457     return pos;
 458 }
 459
 460 static void oss_fini_out (HWVoiceOut *hw)
 461 {
 462     int err;
 463     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 464
 465     ldebug ("oss_fini\n");
 466     oss_anal_close (&oss->fd);
 467
 468     if (oss->mmapped && hw->buf_emul) {
 469         err = munmap(hw->buf_emul, hw->size_emul);
 470         if (err) {
 471             oss_logerr(errno, "Failed to unmap buffer %p, size %zu\n",
 472                        hw->buf_emul, hw->size_emul);
 473         }
 474         hw->buf_emul = NULL;
 475     }
 476 }
 477
 478 static int oss_init_out(HWVoiceOut *hw, struct audsettings *as,
 479                         void *drv_opaque)
 480 {
 481     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 482     struct oss_params req, obt;
 483     int endianness;
 484     int err;
 485     int fd;
 486     AudioFormat effective_fmt;
 487     struct audsettings obt_as;
 488     Audiodev *dev = drv_opaque;
 489     AudiodevOssOptions *oopts = &dev->u.oss;
 490
 491     oss->fd = -1;
 492
 493     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 494     req.freq = as->freq;
 495     req.nchannels = as->nchannels;
 496
 497     if (oss_open(0, &req, as, &obt, &fd, dev)) {
 498         return -1;
 499     }
 500
 501     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 502     if (err) {
 503         oss_anal_close (&fd);
 504         return -1;
 505     }
 506
 507     obt_as.freq = obt.freq;
 508     obt_as.nchannels = obt.nchannels;
 509     obt_as.fmt = effective_fmt;
 510     obt_as.endianness = endianness;
 511
 512     audio_pcm_init_info (&hw->info, &obt_as);
 513     oss->nfrags = obt.nfrags;
 514     oss->fragsize = obt.fragsize;
 515
 516     if (obt.nfrags * obt.fragsize % hw->info.bytes_per_frame) {
 517         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 518                obt.nfrags * obt.fragsize, hw->info.bytes_per_frame);
 519     }
 520
 521     hw->samples = (obt.nfrags * obt.fragsize) / hw->info.bytes_per_frame;
 522
 523     oss->mmapped = 0;
 524     if (oopts->has_try_mmap && oopts->try_mmap) {
 525         hw->size_emul = hw->samples * hw->info.bytes_per_frame;
 526         hw->buf_emul = mmap(
 527             NULL,
 528             hw->size_emul,
 529             PROT_READ | PROT_WRITE,
 530             MAP_SHARED,
 531             fd,
 532             0
 533             );
 534         if (hw->buf_emul == MAP_FAILED) {
 535             oss_logerr(errno, "Failed to map %zu bytes of DAC\n",
 536                        hw->size_emul);
 537             hw->buf_emul = NULL;
 538         } else {
 539             int err;
 540             int trig = 0;
 541             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 542                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 543             } else {
 544                 trig = PCM_ENABLE_OUTPUT;
 545                 if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 546                     oss_logerr (
 547                         errno,
 548                         "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 549                         );
 550                 } else {
 551                     oss->mmapped = 1;
 552                 }
 553             }
 554
 555             if (!oss->mmapped) {
 556                 err = munmap(hw->buf_emul, hw->size_emul);
 557                 if (err) {
 558                     oss_logerr(errno, "Failed to unmap buffer %p size %zu\n",
 559                                hw->buf_emul, hw->size_emul);
 560                 }
 561                 hw->buf_emul = NULL;
 562             }
 563         }
 564     }
 565
 566     oss->fd = fd;
 567     oss->dev = dev;
 568     return 0;
 569 }
 570
 571 static void oss_enable_out(HWVoiceOut *hw, bool enable)
 572 {
 573     int trig;
 574     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 575     AudiodevOssPerDirectionOptions *opdo = oss->dev->u.oss.out;
 576
 577     if (enable) {
 578         hw->poll_mode = opdo->try_poll;
 579
 580         ldebug("enabling voice\n");
 581         if (hw->poll_mode) {
 582             oss_poll_out(hw);
 583         }
 584
 585         if (!oss->mmapped) {
 586             return;
 587         }
 588
 589         audio_pcm_info_clear_buf(&hw->info, hw->buf_emul, hw->samples);
 590         trig = PCM_ENABLE_OUTPUT;
 591         if (ioctl(oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 592             oss_logerr(errno,
 593                        "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n");
 594             return;
 595         }
 596     } else {
 597         if (hw->poll_mode) {
 598             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 599             hw->poll_mode = 0;
 600         }
 601
 602         if (!oss->mmapped) {
 603             return;
 604         }
 605
 606         ldebug ("disabling voice\n");
 607         trig = 0;
 608         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 609             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 610             return;
 611         }
 612     }
 613 }
 614
 615 static int oss_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
 616 {
 617     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 618     struct oss_params req, obt;
 619     int endianness;
 620     int err;
 621     int fd;
 622     AudioFormat effective_fmt;
 623     struct audsettings obt_as;
 624     Audiodev *dev = drv_opaque;
 625
 626     oss->fd = -1;
 627
 628     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 629     req.freq = as->freq;
 630     req.nchannels = as->nchannels;
 631     if (oss_open(1, &req, as, &obt, &fd, dev)) {
 632         return -1;
 633     }
 634
 635     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 636     if (err) {
 637         oss_anal_close (&fd);
 638         return -1;
 639     }
 640
 641     obt_as.freq = obt.freq;
 642     obt_as.nchannels = obt.nchannels;
 643     obt_as.fmt = effective_fmt;
 644     obt_as.endianness = endianness;
 645
 646     audio_pcm_init_info (&hw->info, &obt_as);
 647     oss->nfrags = obt.nfrags;
 648     oss->fragsize = obt.fragsize;
 649
 650     if (obt.nfrags * obt.fragsize % hw->info.bytes_per_frame) {
 651         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 652                obt.nfrags * obt.fragsize, hw->info.bytes_per_frame);
 653     }
 654
 655     hw->samples = (obt.nfrags * obt.fragsize) / hw->info.bytes_per_frame;
 656
 657     oss->fd = fd;
 658     oss->dev = dev;
 659     return 0;
 660 }
 661
 662 static void oss_fini_in (HWVoiceIn *hw)
 663 {
 664     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 665
 666     oss_anal_close (&oss->fd);
 667 }
 668
 669 static size_t oss_read(HWVoiceIn *hw, void *buf, size_t len)
 670 {
 671     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 672     size_t pos = 0;
 673
 674     while (len) {
 675         ssize_t nread;
 676
 677         void *dst = advance(buf, pos);
 678         nread = read(oss->fd, dst, len);
 679
 680         if (nread == -1) {
 681             switch (errno) {
 682             case EINTR:
 683             case EAGAIN:
 684                 break;
 685             default:
 686                 oss_logerr(errno, "Failed to read %zu bytes of audio (to %p)\n",
 687                            len, dst);
 688                 break;
 689             }
 690             break;
 691         }
 692
 693         pos += nread;
 694         len -= nread;
 695     }
 696
 697     return pos;
 698 }
 699
 700 static void oss_enable_in(HWVoiceIn *hw, bool enable)
 701 {
 702     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 703     AudiodevOssPerDirectionOptions *opdo = oss->dev->u.oss.out;
 704
 705     if (enable) {
 706         hw->poll_mode = opdo->try_poll;
 707
 708         if (hw->poll_mode) {
 709             oss_poll_in(hw);
 710         }
 711     } else {
 712         if (hw->poll_mode) {
 713             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 714             hw->poll_mode = 0;
 715         }
 716     }
 717 }
 718
 719 static void oss_init_per_direction(AudiodevOssPerDirectionOptions *opdo)
 720 {
 721     if (!opdo->has_try_poll) {
 722         opdo->try_poll = true;
 723         opdo->has_try_poll = true;
 724     }
 725 }
 726
 727 static void *oss_audio_init(Audiodev *dev)
 728 {
 729     AudiodevOssOptions *oopts;
 730     assert(dev->driver == AUDIODEV_DRIVER_OSS);
 731
 732     oopts = &dev->u.oss;
 733     oss_init_per_direction(oopts->in);
 734     oss_init_per_direction(oopts->out);
 735
 736     if (access(oopts->in->has_dev ? oopts->in->dev : "/dev/dsp",
 737                R_OK | W_OK) < 0 ||
 738         access(oopts->out->has_dev ? oopts->out->dev : "/dev/dsp",
 739                R_OK | W_OK) < 0) {
 740         return NULL;
 741     }
 742     return dev;
 743 }
 744
 745 static void oss_audio_fini (void *opaque)
 746 {
 747 }
 748
 749 static struct audio_pcm_ops oss_pcm_ops = {
 750     .init_out = oss_init_out,
 751     .fini_out = oss_fini_out,
 752     .write    = oss_write,
 753     .run_buffer_out = oss_run_buffer_out,
 754     .get_buffer_out = oss_get_buffer_out,
 755     .put_buffer_out = oss_put_buffer_out,
 756     .enable_out = oss_enable_out,
 757
 758     .init_in  = oss_init_in,
 759     .fini_in  = oss_fini_in,
 760     .read     = oss_read,
 761     .run_buffer_in = audio_generic_run_buffer_in,
 762     .enable_in = oss_enable_in
 763 };
 764
 765 static struct audio_driver oss_audio_driver = {
 766     .name           = "oss",
 767     .descr          = "OSS http://www.opensound.com",
 768     .init           = oss_audio_init,
 769     .fini           = oss_audio_fini,
 770     .pcm_ops        = &oss_pcm_ops,
 771     .can_be_default = 1,
 772     .max_voices_out = INT_MAX,
 773     .max_voices_in  = INT_MAX,
 774     .voice_size_out = sizeof (OSSVoiceOut),
 775     .voice_size_in  = sizeof (OSSVoiceIn)
 776 };
 777
 778 static void register_audio_oss(void)
 779 {
 780     audio_driver_register(&oss_audio_driver);
 781 }
 782 type_init(register_audio_oss);