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     void *pcm_buf;
  44     int fd;
  45     int wpos;
  46     int nfrags;
  47     int fragsize;
  48     int mmapped;
  49     int pending;
  50     Audiodev *dev;
  51 } OSSVoiceOut;
  52
  53 typedef struct OSSVoiceIn {
  54     HWVoiceIn hw;
  55     void *pcm_buf;
  56     int fd;
  57     int nfrags;
  58     int fragsize;
  59     Audiodev *dev;
  60 } OSSVoiceIn;
  61
  62 struct oss_params {
  63     int freq;
  64     int fmt;
  65     int nchannels;
  66     int nfrags;
  67     int fragsize;
  68 };
  69
  70 static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
  71 {
  72     va_list ap;
  73
  74     va_start (ap, fmt);
  75     AUD_vlog (AUDIO_CAP, fmt, ap);
  76     va_end (ap);
  77
  78     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
  79 }
  80
  81 static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
  82     int err,
  83     const char *typ,
  84     const char *fmt,
  85     ...
  86     )
  87 {
  88     va_list ap;
  89
  90     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
  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 oss_anal_close (int *fdp)
 100 {
 101     int err;
 102
 103     qemu_set_fd_handler (*fdp, NULL, NULL, NULL);
 104     err = close (*fdp);
 105     if (err) {
 106         oss_logerr (errno, "Failed to close file(fd=%d)\n", *fdp);
 107     }
 108     *fdp = -1;
 109 }
 110
 111 static void oss_helper_poll_out (void *opaque)
 112 {
 113     AudioState *s = opaque;
 114     audio_run(s, "oss_poll_out");
 115 }
 116
 117 static void oss_helper_poll_in (void *opaque)
 118 {
 119     AudioState *s = opaque;
 120     audio_run(s, "oss_poll_in");
 121 }
 122
 123 static void oss_poll_out (HWVoiceOut *hw)
 124 {
 125     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 126
 127     qemu_set_fd_handler(oss->fd, NULL, oss_helper_poll_out, hw->s);
 128 }
 129
 130 static void oss_poll_in (HWVoiceIn *hw)
 131 {
 132     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 133
 134     qemu_set_fd_handler(oss->fd, oss_helper_poll_in, NULL, hw->s);
 135 }
 136
 137 static int aud_to_ossfmt (AudioFormat fmt, int endianness)
 138 {
 139     switch (fmt) {
 140     case AUDIO_FORMAT_S8:
 141         return AFMT_S8;
 142
 143     case AUDIO_FORMAT_U8:
 144         return AFMT_U8;
 145
 146     case AUDIO_FORMAT_S16:
 147         if (endianness) {
 148             return AFMT_S16_BE;
 149         }
 150         else {
 151             return AFMT_S16_LE;
 152         }
 153
 154     case AUDIO_FORMAT_U16:
 155         if (endianness) {
 156             return AFMT_U16_BE;
 157         }
 158         else {
 159             return AFMT_U16_LE;
 160         }
 161
 162     default:
 163         dolog ("Internal logic error: Bad audio format %d\n", fmt);
 164 #ifdef DEBUG_AUDIO
 165         abort ();
 166 #endif
 167         return AFMT_U8;
 168     }
 169 }
 170
 171 static int oss_to_audfmt (int ossfmt, AudioFormat *fmt, int *endianness)
 172 {
 173     switch (ossfmt) {
 174     case AFMT_S8:
 175         *endianness = 0;
 176         *fmt = AUDIO_FORMAT_S8;
 177         break;
 178
 179     case AFMT_U8:
 180         *endianness = 0;
 181         *fmt = AUDIO_FORMAT_U8;
 182         break;
 183
 184     case AFMT_S16_LE:
 185         *endianness = 0;
 186         *fmt = AUDIO_FORMAT_S16;
 187         break;
 188
 189     case AFMT_U16_LE:
 190         *endianness = 0;
 191         *fmt = AUDIO_FORMAT_U16;
 192         break;
 193
 194     case AFMT_S16_BE:
 195         *endianness = 1;
 196         *fmt = AUDIO_FORMAT_S16;
 197         break;
 198
 199     case AFMT_U16_BE:
 200         *endianness = 1;
 201         *fmt = AUDIO_FORMAT_U16;
 202         break;
 203
 204     default:
 205         dolog ("Unrecognized audio format %d\n", ossfmt);
 206         return -1;
 207     }
 208
 209     return 0;
 210 }
 211
 212 #if defined DEBUG_MISMATCHES || defined DEBUG
 213 static void oss_dump_info (struct oss_params *req, struct oss_params *obt)
 214 {
 215     dolog ("parameter | requested value | obtained value\n");
 216     dolog ("format    |      %10d |     %10d\n", req->fmt, obt->fmt);
 217     dolog ("channels  |      %10d |     %10d\n",
 218            req->nchannels, obt->nchannels);
 219     dolog ("frequency |      %10d |     %10d\n", req->freq, obt->freq);
 220     dolog ("nfrags    |      %10d |     %10d\n", req->nfrags, obt->nfrags);
 221     dolog ("fragsize  |      %10d |     %10d\n",
 222            req->fragsize, obt->fragsize);
 223 }
 224 #endif
 225
 226 #ifdef USE_DSP_POLICY
 227 static int oss_get_version (int fd, int *version, const char *typ)
 228 {
 229     if (ioctl (fd, OSS_GETVERSION, &version)) {
 230 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 231         /*
 232          * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION
 233          * since 7.x, but currently only on the mixer device (or in
 234          * the Linuxolator), and in the native version that part of
 235          * the code is in fact never reached so the ioctl fails anyway.
 236          * Until this is fixed, just check the errno and if its what
 237          * FreeBSD's sound drivers return atm assume they are new enough.
 238          */
 239         if (errno == EINVAL) {
 240             *version = 0x040000;
 241             return 0;
 242         }
 243 #endif
 244         oss_logerr2 (errno, typ, "Failed to get OSS version\n");
 245         return -1;
 246     }
 247     return 0;
 248 }
 249 #endif
 250
 251 static int oss_open(int in, struct oss_params *req, audsettings *as,
 252                     struct oss_params *obt, int *pfd, Audiodev *dev)
 253 {
 254     AudiodevOssOptions *oopts = &dev->u.oss;
 255     AudiodevOssPerDirectionOptions *opdo = in ? oopts->in : oopts->out;
 256     int fd;
 257     int oflags = (oopts->has_exclusive && oopts->exclusive) ? O_EXCL : 0;
 258     audio_buf_info abinfo;
 259     int fmt, freq, nchannels;
 260     int setfragment = 1;
 261     const char *dspname = opdo->has_dev ? opdo->dev : "/dev/dsp";
 262     const char *typ = in ? "ADC" : "DAC";
 263 #ifdef USE_DSP_POLICY
 264     int policy = oopts->has_dsp_policy ? oopts->dsp_policy : 5;
 265 #endif
 266
 267     /* Kludge needed to have working mmap on Linux */
 268     oflags |= (oopts->has_try_mmap && oopts->try_mmap) ?
 269         O_RDWR : (in ? O_RDONLY : O_WRONLY);
 270
 271     fd = open (dspname, oflags | O_NONBLOCK);
 272     if (-1 == fd) {
 273         oss_logerr2 (errno, typ, "Failed to open `%s'\n", dspname);
 274         return -1;
 275     }
 276
 277     freq = req->freq;
 278     nchannels = req->nchannels;
 279     fmt = req->fmt;
 280     req->nfrags = opdo->has_buffer_count ? opdo->buffer_count : 4;
 281     req->fragsize = audio_buffer_bytes(
 282         qapi_AudiodevOssPerDirectionOptions_base(opdo), as, 23220);
 283
 284     if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
 285         oss_logerr2 (errno, typ, "Failed to set sample size %d\n", req->fmt);
 286         goto err;
 287     }
 288
 289     if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
 290         oss_logerr2 (errno, typ, "Failed to set number of channels %d\n",
 291                      req->nchannels);
 292         goto err;
 293     }
 294
 295     if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
 296         oss_logerr2 (errno, typ, "Failed to set frequency %d\n", req->freq);
 297         goto err;
 298     }
 299
 300     if (ioctl (fd, SNDCTL_DSP_NONBLOCK, NULL)) {
 301         oss_logerr2 (errno, typ, "Failed to set non-blocking mode\n");
 302         goto err;
 303     }
 304
 305 #ifdef USE_DSP_POLICY
 306     if (policy >= 0) {
 307         int version;
 308
 309         if (!oss_get_version (fd, &version, typ)) {
 310             trace_oss_version(version);
 311
 312             if (version >= 0x040000) {
 313                 int policy2 = policy;
 314                 if (ioctl(fd, SNDCTL_DSP_POLICY, &policy2)) {
 315                     oss_logerr2 (errno, typ,
 316                                  "Failed to set timing policy to %d\n",
 317                                  policy);
 318                     goto err;
 319                 }
 320                 setfragment = 0;
 321             }
 322         }
 323     }
 324 #endif
 325
 326     if (setfragment) {
 327         int mmmmssss = (req->nfrags << 16) | ctz32 (req->fragsize);
 328         if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
 329             oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
 330                          req->nfrags, req->fragsize);
 331             goto err;
 332         }
 333     }
 334
 335     if (ioctl (fd, in ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE, &abinfo)) {
 336         oss_logerr2 (errno, typ, "Failed to get buffer length\n");
 337         goto err;
 338     }
 339
 340     if (!abinfo.fragstotal || !abinfo.fragsize) {
 341         AUD_log (AUDIO_CAP, "Returned bogus buffer information(%d, %d) for %s\n",
 342                  abinfo.fragstotal, abinfo.fragsize, typ);
 343         goto err;
 344     }
 345
 346     obt->fmt = fmt;
 347     obt->nchannels = nchannels;
 348     obt->freq = freq;
 349     obt->nfrags = abinfo.fragstotal;
 350     obt->fragsize = abinfo.fragsize;
 351     *pfd = fd;
 352
 353 #ifdef DEBUG_MISMATCHES
 354     if ((req->fmt != obt->fmt) ||
 355         (req->nchannels != obt->nchannels) ||
 356         (req->freq != obt->freq) ||
 357         (req->fragsize != obt->fragsize) ||
 358         (req->nfrags != obt->nfrags)) {
 359         dolog ("Audio parameters mismatch\n");
 360         oss_dump_info (req, obt);
 361     }
 362 #endif
 363
 364 #ifdef DEBUG
 365     oss_dump_info (req, obt);
 366 #endif
 367     return 0;
 368
 369  err:
 370     oss_anal_close (&fd);
 371     return -1;
 372 }
 373
 374 static void oss_write_pending (OSSVoiceOut *oss)
 375 {
 376     HWVoiceOut *hw = &oss->hw;
 377
 378     if (oss->mmapped) {
 379         return;
 380     }
 381
 382     while (oss->pending) {
 383         int samples_written;
 384         ssize_t bytes_written;
 385         int samples_till_end = hw->samples - oss->wpos;
 386         int samples_to_write = MIN (oss->pending, samples_till_end);
 387         int bytes_to_write = samples_to_write << hw->info.shift;
 388         void *pcm = advance (oss->pcm_buf, oss->wpos << hw->info.shift);
 389
 390         bytes_written = write (oss->fd, pcm, bytes_to_write);
 391         if (bytes_written < 0) {
 392             if (errno != EAGAIN) {
 393                 oss_logerr (errno, "failed to write %d bytes\n",
 394                             bytes_to_write);
 395             }
 396             break;
 397         }
 398
 399         if (bytes_written & hw->info.align) {
 400             dolog ("misaligned write asked for %d, but got %zd\n",
 401                    bytes_to_write, bytes_written);
 402             return;
 403         }
 404
 405         samples_written = bytes_written >> hw->info.shift;
 406         oss->pending -= samples_written;
 407         oss->wpos = (oss->wpos + samples_written) % hw->samples;
 408         if (bytes_written - bytes_to_write) {
 409             break;
 410         }
 411     }
 412 }
 413
 414 static int oss_run_out (HWVoiceOut *hw, int live)
 415 {
 416     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 417     int err, decr;
 418     struct audio_buf_info abinfo;
 419     struct count_info cntinfo;
 420     int bufsize;
 421
 422     bufsize = hw->samples << hw->info.shift;
 423
 424     if (oss->mmapped) {
 425         int bytes, pos;
 426
 427         err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
 428         if (err < 0) {
 429             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 430             return 0;
 431         }
 432
 433         pos = hw->rpos << hw->info.shift;
 434         bytes = audio_ring_dist (cntinfo.ptr, pos, bufsize);
 435         decr = MIN (bytes >> hw->info.shift, live);
 436     }
 437     else {
 438         err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
 439         if (err < 0) {
 440             oss_logerr (errno, "SNDCTL_DSP_GETOPTR failed\n");
 441             return 0;
 442         }
 443
 444         if (abinfo.bytes > bufsize) {
 445             trace_oss_invalid_available_size(abinfo.bytes, bufsize);
 446             abinfo.bytes = bufsize;
 447         }
 448
 449         if (abinfo.bytes < 0) {
 450             trace_oss_invalid_available_size(abinfo.bytes, bufsize);
 451             return 0;
 452         }
 453
 454         decr = MIN (abinfo.bytes >> hw->info.shift, live);
 455         if (!decr) {
 456             return 0;
 457         }
 458     }
 459
 460     decr = audio_pcm_hw_clip_out (hw, oss->pcm_buf, decr, oss->pending);
 461     oss->pending += decr;
 462     oss_write_pending (oss);
 463
 464     return decr;
 465 }
 466
 467 static void oss_fini_out (HWVoiceOut *hw)
 468 {
 469     int err;
 470     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 471
 472     ldebug ("oss_fini\n");
 473     oss_anal_close (&oss->fd);
 474
 475     if (oss->pcm_buf) {
 476         if (oss->mmapped) {
 477             err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 478             if (err) {
 479                 oss_logerr (errno, "Failed to unmap buffer %p, size %d\n",
 480                             oss->pcm_buf, hw->samples << hw->info.shift);
 481             }
 482         }
 483         else {
 484             g_free (oss->pcm_buf);
 485         }
 486         oss->pcm_buf = 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.align) {
 529         dolog ("warning: Misaligned DAC buffer, size %d, alignment %d\n",
 530                obt.nfrags * obt.fragsize, hw->info.align + 1);
 531     }
 532
 533     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 534
 535     oss->mmapped = 0;
 536     if (oopts->has_try_mmap && oopts->try_mmap) {
 537         oss->pcm_buf = mmap (
 538             NULL,
 539             hw->samples << hw->info.shift,
 540             PROT_READ | PROT_WRITE,
 541             MAP_SHARED,
 542             fd,
 543             0
 544             );
 545         if (oss->pcm_buf == MAP_FAILED) {
 546             oss_logerr (errno, "Failed to map %d bytes of DAC\n",
 547                         hw->samples << hw->info.shift);
 548         }
 549         else {
 550             int err;
 551             int trig = 0;
 552             if (ioctl (fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 553                 oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 554             }
 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                 }
 563                 else {
 564                     oss->mmapped = 1;
 565                 }
 566             }
 567
 568             if (!oss->mmapped) {
 569                 err = munmap (oss->pcm_buf, hw->samples << hw->info.shift);
 570                 if (err) {
 571                     oss_logerr (errno, "Failed to unmap buffer %p size %d\n",
 572                                 oss->pcm_buf, hw->samples << hw->info.shift);
 573                 }
 574             }
 575         }
 576     }
 577
 578     if (!oss->mmapped) {
 579         oss->pcm_buf = audio_calloc(__func__,
 580                                     hw->samples,
 581                                     1 << hw->info.shift);
 582         if (!oss->pcm_buf) {
 583             dolog (
 584                 "Could not allocate DAC buffer (%d samples, each %d bytes)\n",
 585                 hw->samples,
 586                 1 << hw->info.shift
 587                 );
 588             oss_anal_close (&fd);
 589             return -1;
 590         }
 591     }
 592
 593     oss->fd = fd;
 594     oss->dev = dev;
 595     return 0;
 596 }
 597
 598 static int oss_ctl_out (HWVoiceOut *hw, int cmd, ...)
 599 {
 600     int trig;
 601     OSSVoiceOut *oss = (OSSVoiceOut *) hw;
 602     AudiodevOssPerDirectionOptions *opdo = oss->dev->u.oss.out;
 603
 604     switch (cmd) {
 605     case VOICE_ENABLE:
 606         {
 607             bool poll_mode = opdo->try_poll;
 608
 609             ldebug ("enabling voice\n");
 610             if (poll_mode) {
 611                 oss_poll_out (hw);
 612                 poll_mode = 0;
 613             }
 614             hw->poll_mode = poll_mode;
 615
 616             if (!oss->mmapped) {
 617                 return 0;
 618             }
 619
 620             audio_pcm_info_clear_buf (&hw->info, oss->pcm_buf, hw->samples);
 621             trig = PCM_ENABLE_OUTPUT;
 622             if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 623                 oss_logerr (
 624                     errno,
 625                     "SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
 626                     );
 627                 return -1;
 628             }
 629         }
 630         break;
 631
 632     case VOICE_DISABLE:
 633         if (hw->poll_mode) {
 634             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 635             hw->poll_mode = 0;
 636         }
 637
 638         if (!oss->mmapped) {
 639             return 0;
 640         }
 641
 642         ldebug ("disabling voice\n");
 643         trig = 0;
 644         if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
 645             oss_logerr (errno, "SNDCTL_DSP_SETTRIGGER 0 failed\n");
 646             return -1;
 647         }
 648         break;
 649     }
 650     return 0;
 651 }
 652
 653 static int oss_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
 654 {
 655     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 656     struct oss_params req, obt;
 657     int endianness;
 658     int err;
 659     int fd;
 660     AudioFormat effective_fmt;
 661     struct audsettings obt_as;
 662     Audiodev *dev = drv_opaque;
 663
 664     oss->fd = -1;
 665
 666     req.fmt = aud_to_ossfmt (as->fmt, as->endianness);
 667     req.freq = as->freq;
 668     req.nchannels = as->nchannels;
 669     if (oss_open(1, &req, as, &obt, &fd, dev)) {
 670         return -1;
 671     }
 672
 673     err = oss_to_audfmt (obt.fmt, &effective_fmt, &endianness);
 674     if (err) {
 675         oss_anal_close (&fd);
 676         return -1;
 677     }
 678
 679     obt_as.freq = obt.freq;
 680     obt_as.nchannels = obt.nchannels;
 681     obt_as.fmt = effective_fmt;
 682     obt_as.endianness = endianness;
 683
 684     audio_pcm_init_info (&hw->info, &obt_as);
 685     oss->nfrags = obt.nfrags;
 686     oss->fragsize = obt.fragsize;
 687
 688     if (obt.nfrags * obt.fragsize & hw->info.align) {
 689         dolog ("warning: Misaligned ADC buffer, size %d, alignment %d\n",
 690                obt.nfrags * obt.fragsize, hw->info.align + 1);
 691     }
 692
 693     hw->samples = (obt.nfrags * obt.fragsize) >> hw->info.shift;
 694     oss->pcm_buf = audio_calloc(__func__, hw->samples, 1 << hw->info.shift);
 695     if (!oss->pcm_buf) {
 696         dolog ("Could not allocate ADC buffer (%d samples, each %d bytes)\n",
 697                hw->samples, 1 << hw->info.shift);
 698         oss_anal_close (&fd);
 699         return -1;
 700     }
 701
 702     oss->fd = fd;
 703     oss->dev = dev;
 704     return 0;
 705 }
 706
 707 static void oss_fini_in (HWVoiceIn *hw)
 708 {
 709     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 710
 711     oss_anal_close (&oss->fd);
 712
 713     g_free(oss->pcm_buf);
 714     oss->pcm_buf = NULL;
 715 }
 716
 717 static int oss_run_in (HWVoiceIn *hw)
 718 {
 719     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 720     int hwshift = hw->info.shift;
 721     int i;
 722     int live = audio_pcm_hw_get_live_in (hw);
 723     int dead = hw->samples - live;
 724     size_t read_samples = 0;
 725     struct {
 726         int add;
 727         int len;
 728     } bufs[2] = {
 729         { .add = hw->wpos, .len = 0 },
 730         { .add = 0,        .len = 0 }
 731     };
 732
 733     if (!dead) {
 734         return 0;
 735     }
 736
 737     if (hw->wpos + dead > hw->samples) {
 738         bufs[0].len = (hw->samples - hw->wpos) << hwshift;
 739         bufs[1].len = (dead - (hw->samples - hw->wpos)) << hwshift;
 740     }
 741     else {
 742         bufs[0].len = dead << hwshift;
 743     }
 744
 745     for (i = 0; i < 2; ++i) {
 746         ssize_t nread;
 747
 748         if (bufs[i].len) {
 749             void *p = advance (oss->pcm_buf, bufs[i].add << hwshift);
 750             nread = read (oss->fd, p, bufs[i].len);
 751
 752             if (nread > 0) {
 753                 if (nread & hw->info.align) {
 754                     dolog ("warning: Misaligned read %zd (requested %d), "
 755                            "alignment %d\n", nread, bufs[i].add << hwshift,
 756                            hw->info.align + 1);
 757                 }
 758                 read_samples += nread >> hwshift;
 759                 hw->conv (hw->conv_buf + bufs[i].add, p, nread >> hwshift);
 760             }
 761
 762             if (bufs[i].len - nread) {
 763                 if (nread == -1) {
 764                     switch (errno) {
 765                     case EINTR:
 766                     case EAGAIN:
 767                         break;
 768                     default:
 769                         oss_logerr (
 770                             errno,
 771                             "Failed to read %d bytes of audio (to %p)\n",
 772                             bufs[i].len, p
 773                             );
 774                         break;
 775                     }
 776                 }
 777                 break;
 778             }
 779         }
 780     }
 781
 782     hw->wpos = (hw->wpos + read_samples) % hw->samples;
 783     return read_samples;
 784 }
 785
 786 static int oss_ctl_in (HWVoiceIn *hw, int cmd, ...)
 787 {
 788     OSSVoiceIn *oss = (OSSVoiceIn *) hw;
 789     AudiodevOssPerDirectionOptions *opdo = oss->dev->u.oss.out;
 790
 791     switch (cmd) {
 792     case VOICE_ENABLE:
 793         {
 794             bool poll_mode = opdo->try_poll;
 795
 796             if (poll_mode) {
 797                 oss_poll_in (hw);
 798                 poll_mode = 0;
 799             }
 800             hw->poll_mode = poll_mode;
 801         }
 802         break;
 803
 804     case VOICE_DISABLE:
 805         if (hw->poll_mode) {
 806             hw->poll_mode = 0;
 807             qemu_set_fd_handler (oss->fd, NULL, NULL, NULL);
 808         }
 809         break;
 810     }
 811     return 0;
 812 }
 813
 814 static void oss_init_per_direction(AudiodevOssPerDirectionOptions *opdo)
 815 {
 816     if (!opdo->has_try_poll) {
 817         opdo->try_poll = true;
 818         opdo->has_try_poll = true;
 819     }
 820 }
 821
 822 static void *oss_audio_init(Audiodev *dev)
 823 {
 824     AudiodevOssOptions *oopts;
 825     assert(dev->driver == AUDIODEV_DRIVER_OSS);
 826
 827     oopts = &dev->u.oss;
 828     oss_init_per_direction(oopts->in);
 829     oss_init_per_direction(oopts->out);
 830
 831     if (access(oopts->in->has_dev ? oopts->in->dev : "/dev/dsp",
 832                R_OK | W_OK) < 0 ||
 833         access(oopts->out->has_dev ? oopts->out->dev : "/dev/dsp",
 834                R_OK | W_OK) < 0) {
 835         return NULL;
 836     }
 837     return dev;
 838 }
 839
 840 static void oss_audio_fini (void *opaque)
 841 {
 842 }
 843
 844 static struct audio_pcm_ops oss_pcm_ops = {
 845     .init_out = oss_init_out,
 846     .fini_out = oss_fini_out,
 847     .run_out  = oss_run_out,
 848     .ctl_out  = oss_ctl_out,
 849
 850     .init_in  = oss_init_in,
 851     .fini_in  = oss_fini_in,
 852     .run_in   = oss_run_in,
 853     .ctl_in   = oss_ctl_in
 854 };
 855
 856 static struct audio_driver oss_audio_driver = {
 857     .name           = "oss",
 858     .descr          = "OSS http://www.opensound.com",
 859     .init           = oss_audio_init,
 860     .fini           = oss_audio_fini,
 861     .pcm_ops        = &oss_pcm_ops,
 862     .can_be_default = 1,
 863     .max_voices_out = INT_MAX,
 864     .max_voices_in  = INT_MAX,
 865     .voice_size_out = sizeof (OSSVoiceOut),
 866     .voice_size_in  = sizeof (OSSVoiceIn)
 867 };
 868
 869 static void register_audio_oss(void)
 870 {
 871     audio_driver_register(&oss_audio_driver);
 872 }
 873 type_init(register_audio_oss);