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