audio/dsoundaudio.c

   1 /*
   2  * QEMU DirectSound audio driver
   3  *
   4  * Copyright (c) 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 /*
  26  * SEAL 1.07 by Carlos 'pel' Hasan was used as documentation
  27  */
  28
  29 #include "qemu/osdep.h"
  30 #include "audio.h"
  31
  32 #define AUDIO_CAP "dsound"
  33 #include "audio_int.h"
  34 #include "qemu/host-utils.h"
  35 #include "qemu/module.h"
  36
  37 #include <windows.h>
  38 #include <mmsystem.h>
  39 #include <objbase.h>
  40 #include <dsound.h>
  41
  42 #include "audio_win_int.h"
  43
  44 /* #define DEBUG_DSOUND */
  45
  46 typedef struct {
  47     LPDIRECTSOUND dsound;
  48     LPDIRECTSOUNDCAPTURE dsound_capture;
  49     struct audsettings settings;
  50     Audiodev *dev;
  51 } dsound;
  52
  53 typedef struct {
  54     HWVoiceOut hw;
  55     LPDIRECTSOUNDBUFFER dsound_buffer;
  56     dsound *s;
  57 } DSoundVoiceOut;
  58
  59 typedef struct {
  60     HWVoiceIn hw;
  61     LPDIRECTSOUNDCAPTUREBUFFER dsound_capture_buffer;
  62     dsound *s;
  63 } DSoundVoiceIn;
  64
  65 static void dsound_log_hresult (HRESULT hr)
  66 {
  67     const char *str = "BUG";
  68
  69     switch (hr) {
  70     case DS_OK:
  71         str = "The method succeeded";
  72         break;
  73 #ifdef DS_NO_VIRTUALIZATION
  74     case DS_NO_VIRTUALIZATION:
  75         str = "The buffer was created, but another 3D algorithm was substituted";
  76         break;
  77 #endif
  78 #ifdef DS_INCOMPLETE
  79     case DS_INCOMPLETE:
  80         str = "The method succeeded, but not all the optional effects were obtained";
  81         break;
  82 #endif
  83 #ifdef DSERR_ACCESSDENIED
  84     case DSERR_ACCESSDENIED:
  85         str = "The request failed because access was denied";
  86         break;
  87 #endif
  88 #ifdef DSERR_ALLOCATED
  89     case DSERR_ALLOCATED:
  90         str = "The request failed because resources, such as a priority level, were already in use by another caller";
  91         break;
  92 #endif
  93 #ifdef DSERR_ALREADYINITIALIZED
  94     case DSERR_ALREADYINITIALIZED:
  95         str = "The object is already initialized";
  96         break;
  97 #endif
  98 #ifdef DSERR_BADFORMAT
  99     case DSERR_BADFORMAT:
 100         str = "The specified wave format is not supported";
 101         break;
 102 #endif
 103 #ifdef DSERR_BADSENDBUFFERGUID
 104     case DSERR_BADSENDBUFFERGUID:
 105         str = "The GUID specified in an audiopath file does not match a valid mix-in buffer";
 106         break;
 107 #endif
 108 #ifdef DSERR_BUFFERLOST
 109     case DSERR_BUFFERLOST:
 110         str = "The buffer memory has been lost and must be restored";
 111         break;
 112 #endif
 113 #ifdef DSERR_BUFFERTOOSMALL
 114     case DSERR_BUFFERTOOSMALL:
 115         str = "The buffer size is not great enough to enable effects processing";
 116         break;
 117 #endif
 118 #ifdef DSERR_CONTROLUNAVAIL
 119     case DSERR_CONTROLUNAVAIL:
 120         str = "The buffer control (volume, pan, and so on) requested by the caller is not available. Controls must be specified when the buffer is created, using the dwFlags member of DSBUFFERDESC";
 121         break;
 122 #endif
 123 #ifdef DSERR_DS8_REQUIRED
 124     case DSERR_DS8_REQUIRED:
 125         str = "A DirectSound object of class CLSID_DirectSound8 or later is required for the requested functionality. For more information, see IDirectSound8 Interface";
 126         break;
 127 #endif
 128 #ifdef DSERR_FXUNAVAILABLE
 129     case DSERR_FXUNAVAILABLE:
 130         str = "The effects requested could not be found on the system, or they are in the wrong order or in the wrong location; for example, an effect expected in hardware was found in software";
 131         break;
 132 #endif
 133 #ifdef DSERR_GENERIC
 134     case DSERR_GENERIC :
 135         str = "An undetermined error occurred inside the DirectSound subsystem";
 136         break;
 137 #endif
 138 #ifdef DSERR_INVALIDCALL
 139     case DSERR_INVALIDCALL:
 140         str = "This function is not valid for the current state of this object";
 141         break;
 142 #endif
 143 #ifdef DSERR_INVALIDPARAM
 144     case DSERR_INVALIDPARAM:
 145         str = "An invalid parameter was passed to the returning function";
 146         break;
 147 #endif
 148 #ifdef DSERR_NOAGGREGATION
 149     case DSERR_NOAGGREGATION:
 150         str = "The object does not support aggregation";
 151         break;
 152 #endif
 153 #ifdef DSERR_NODRIVER
 154     case DSERR_NODRIVER:
 155         str = "No sound driver is available for use, or the given GUID is not a valid DirectSound device ID";
 156         break;
 157 #endif
 158 #ifdef DSERR_NOINTERFACE
 159     case DSERR_NOINTERFACE:
 160         str = "The requested COM interface is not available";
 161         break;
 162 #endif
 163 #ifdef DSERR_OBJECTNOTFOUND
 164     case DSERR_OBJECTNOTFOUND:
 165         str = "The requested object was not found";
 166         break;
 167 #endif
 168 #ifdef DSERR_OTHERAPPHASPRIO
 169     case DSERR_OTHERAPPHASPRIO:
 170         str = "Another application has a higher priority level, preventing this call from succeeding";
 171         break;
 172 #endif
 173 #ifdef DSERR_OUTOFMEMORY
 174     case DSERR_OUTOFMEMORY:
 175         str = "The DirectSound subsystem could not allocate sufficient memory to complete the caller's request";
 176         break;
 177 #endif
 178 #ifdef DSERR_PRIOLEVELNEEDED
 179     case DSERR_PRIOLEVELNEEDED:
 180         str = "A cooperative level of DSSCL_PRIORITY or higher is required";
 181         break;
 182 #endif
 183 #ifdef DSERR_SENDLOOP
 184     case DSERR_SENDLOOP:
 185         str = "A circular loop of send effects was detected";
 186         break;
 187 #endif
 188 #ifdef DSERR_UNINITIALIZED
 189     case DSERR_UNINITIALIZED:
 190         str = "The Initialize method has not been called or has not been called successfully before other methods were called";
 191         break;
 192 #endif
 193 #ifdef DSERR_UNSUPPORTED
 194     case DSERR_UNSUPPORTED:
 195         str = "The function called is not supported at this time";
 196         break;
 197 #endif
 198     default:
 199         AUD_log (AUDIO_CAP, "Reason: Unknown (HRESULT %#lx)\n", hr);
 200         return;
 201     }
 202
 203     AUD_log (AUDIO_CAP, "Reason: %s\n", str);
 204 }
 205
 206 static void GCC_FMT_ATTR (2, 3) dsound_logerr (
 207     HRESULT hr,
 208     const char *fmt,
 209     ...
 210     )
 211 {
 212     va_list ap;
 213
 214     va_start (ap, fmt);
 215     AUD_vlog (AUDIO_CAP, fmt, ap);
 216     va_end (ap);
 217
 218     dsound_log_hresult (hr);
 219 }
 220
 221 static void GCC_FMT_ATTR (3, 4) dsound_logerr2 (
 222     HRESULT hr,
 223     const char *typ,
 224     const char *fmt,
 225     ...
 226     )
 227 {
 228     va_list ap;
 229
 230     AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
 231     va_start (ap, fmt);
 232     AUD_vlog (AUDIO_CAP, fmt, ap);
 233     va_end (ap);
 234
 235     dsound_log_hresult (hr);
 236 }
 237
 238 #ifdef DEBUG_DSOUND
 239 static void print_wave_format (WAVEFORMATEX *wfx)
 240 {
 241     dolog ("tag             = %d\n", wfx->wFormatTag);
 242     dolog ("nChannels       = %d\n", wfx->nChannels);
 243     dolog ("nSamplesPerSec  = %ld\n", wfx->nSamplesPerSec);
 244     dolog ("nAvgBytesPerSec = %ld\n", wfx->nAvgBytesPerSec);
 245     dolog ("nBlockAlign     = %d\n", wfx->nBlockAlign);
 246     dolog ("wBitsPerSample  = %d\n", wfx->wBitsPerSample);
 247     dolog ("cbSize          = %d\n", wfx->cbSize);
 248 }
 249 #endif
 250
 251 static int dsound_restore_out (LPDIRECTSOUNDBUFFER dsb, dsound *s)
 252 {
 253     HRESULT hr;
 254
 255     hr = IDirectSoundBuffer_Restore (dsb);
 256
 257     if (hr != DS_OK) {
 258         dsound_logerr (hr, "Could not restore playback buffer\n");
 259         return -1;
 260     }
 261     return 0;
 262 }
 263
 264 #include "dsound_template.h"
 265 #define DSBTYPE_IN
 266 #include "dsound_template.h"
 267 #undef DSBTYPE_IN
 268
 269 static int dsound_get_status_out (LPDIRECTSOUNDBUFFER dsb, DWORD *statusp,
 270                                   dsound *s)
 271 {
 272     HRESULT hr;
 273
 274     hr = IDirectSoundBuffer_GetStatus (dsb, statusp);
 275     if (FAILED (hr)) {
 276         dsound_logerr (hr, "Could not get playback buffer status\n");
 277         return -1;
 278     }
 279
 280     if (*statusp & DSERR_BUFFERLOST) {
 281         dsound_restore_out(dsb, s);
 282         return -1;
 283     }
 284
 285     return 0;
 286 }
 287
 288 static int dsound_get_status_in (LPDIRECTSOUNDCAPTUREBUFFER dscb,
 289                                  DWORD *statusp)
 290 {
 291     HRESULT hr;
 292
 293     hr = IDirectSoundCaptureBuffer_GetStatus (dscb, statusp);
 294     if (FAILED (hr)) {
 295         dsound_logerr (hr, "Could not get capture buffer status\n");
 296         return -1;
 297     }
 298
 299     return 0;
 300 }
 301
 302 static void dsound_clear_sample (HWVoiceOut *hw, LPDIRECTSOUNDBUFFER dsb,
 303                                  dsound *s)
 304 {
 305     int err;
 306     LPVOID p1, p2;
 307     DWORD blen1, blen2, len1, len2;
 308
 309     err = dsound_lock_out (
 310         dsb,
 311         &hw->info,
 312         0,
 313         hw->size_emul,
 314         &p1, &p2,
 315         &blen1, &blen2,
 316         1,
 317         s
 318         );
 319     if (err) {
 320         return;
 321     }
 322
 323     len1 = blen1 >> hw->info.shift;
 324     len2 = blen2 >> hw->info.shift;
 325
 326 #ifdef DEBUG_DSOUND
 327     dolog ("clear %p,%ld,%ld %p,%ld,%ld\n",
 328            p1, blen1, len1,
 329            p2, blen2, len2);
 330 #endif
 331
 332     if (p1 && len1) {
 333         audio_pcm_info_clear_buf (&hw->info, p1, len1);
 334     }
 335
 336     if (p2 && len2) {
 337         audio_pcm_info_clear_buf (&hw->info, p2, len2);
 338     }
 339
 340     dsound_unlock_out (dsb, p1, p2, blen1, blen2);
 341 }
 342
 343 static int dsound_open (dsound *s)
 344 {
 345     HRESULT hr;
 346     HWND hwnd;
 347
 348     hwnd = GetForegroundWindow ();
 349     hr = IDirectSound_SetCooperativeLevel (
 350         s->dsound,
 351         hwnd,
 352         DSSCL_PRIORITY
 353         );
 354
 355     if (FAILED (hr)) {
 356         dsound_logerr (hr, "Could not set cooperative level for window %p\n",
 357                        hwnd);
 358         return -1;
 359     }
 360
 361     return 0;
 362 }
 363
 364 static void dsound_enable_out(HWVoiceOut *hw, bool enable)
 365 {
 366     HRESULT hr;
 367     DWORD status;
 368     DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
 369     LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
 370     dsound *s = ds->s;
 371
 372     if (!dsb) {
 373         dolog ("Attempt to control voice without a buffer\n");
 374         return;
 375     }
 376
 377     if (enable) {
 378         if (dsound_get_status_out (dsb, &status, s)) {
 379             return;
 380         }
 381
 382         if (status & DSBSTATUS_PLAYING) {
 383             dolog ("warning: Voice is already playing\n");
 384             return;
 385         }
 386
 387         dsound_clear_sample (hw, dsb, s);
 388
 389         hr = IDirectSoundBuffer_Play (dsb, 0, 0, DSBPLAY_LOOPING);
 390         if (FAILED (hr)) {
 391             dsound_logerr (hr, "Could not start playing buffer\n");
 392             return;
 393         }
 394     } else {
 395         if (dsound_get_status_out (dsb, &status, s)) {
 396             return;
 397         }
 398
 399         if (status & DSBSTATUS_PLAYING) {
 400             hr = IDirectSoundBuffer_Stop (dsb);
 401             if (FAILED (hr)) {
 402                 dsound_logerr (hr, "Could not stop playing buffer\n");
 403                 return;
 404             }
 405         }
 406         else {
 407             dolog ("warning: Voice is not playing\n");
 408         }
 409     }
 410 }
 411
 412 static void *dsound_get_buffer_out(HWVoiceOut *hw, size_t *size)
 413 {
 414     DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
 415     LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
 416     HRESULT hr;
 417     DWORD ppos, act_size;
 418     size_t req_size;
 419     int err;
 420     void *ret;
 421
 422     hr = IDirectSoundBuffer_GetCurrentPosition(dsb, &ppos, NULL);
 423     if (FAILED(hr)) {
 424         dsound_logerr(hr, "Could not get playback buffer position\n");
 425         *size = 0;
 426         return NULL;
 427     }
 428
 429     req_size = audio_ring_dist(ppos, hw->pos_emul, hw->size_emul);
 430     req_size = MIN(req_size, hw->size_emul - hw->pos_emul);
 431
 432     err = dsound_lock_out(dsb, &hw->info, hw->pos_emul, req_size, &ret, NULL,
 433                           &act_size, NULL, false, ds->s);
 434     if (err) {
 435         dolog("Failed to lock buffer\n");
 436         *size = 0;
 437         return NULL;
 438     }
 439
 440     *size = act_size;
 441     return ret;
 442 }
 443
 444 static size_t dsound_put_buffer_out(HWVoiceOut *hw, void *buf, size_t len)
 445 {
 446     DSoundVoiceOut *ds = (DSoundVoiceOut *) hw;
 447     LPDIRECTSOUNDBUFFER dsb = ds->dsound_buffer;
 448     int err = dsound_unlock_out(dsb, buf, NULL, len, 0);
 449
 450     if (err) {
 451         dolog("Failed to unlock buffer!!\n");
 452         return 0;
 453     }
 454     hw->pos_emul = (hw->pos_emul + len) % hw->size_emul;
 455
 456     return len;
 457 }
 458
 459 static void dsound_enable_in(HWVoiceIn *hw, bool enable)
 460 {
 461     HRESULT hr;
 462     DWORD status;
 463     DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
 464     LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
 465
 466     if (!dscb) {
 467         dolog ("Attempt to control capture voice without a buffer\n");
 468         return;
 469     }
 470
 471     if (enable) {
 472         if (dsound_get_status_in (dscb, &status)) {
 473             return;
 474         }
 475
 476         if (status & DSCBSTATUS_CAPTURING) {
 477             dolog ("warning: Voice is already capturing\n");
 478             return;
 479         }
 480
 481         /* clear ?? */
 482
 483         hr = IDirectSoundCaptureBuffer_Start (dscb, DSCBSTART_LOOPING);
 484         if (FAILED (hr)) {
 485             dsound_logerr (hr, "Could not start capturing\n");
 486             return;
 487         }
 488     } else {
 489         if (dsound_get_status_in (dscb, &status)) {
 490             return;
 491         }
 492
 493         if (status & DSCBSTATUS_CAPTURING) {
 494             hr = IDirectSoundCaptureBuffer_Stop (dscb);
 495             if (FAILED (hr)) {
 496                 dsound_logerr (hr, "Could not stop capturing\n");
 497                 return;
 498             }
 499         }
 500         else {
 501             dolog ("warning: Voice is not capturing\n");
 502         }
 503     }
 504 }
 505
 506 static void *dsound_get_buffer_in(HWVoiceIn *hw, size_t *size)
 507 {
 508     DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
 509     LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
 510     HRESULT hr;
 511     DWORD cpos, act_size;
 512     size_t req_size;
 513     int err;
 514     void *ret;
 515
 516     hr = IDirectSoundCaptureBuffer_GetCurrentPosition(dscb, &cpos, NULL);
 517     if (FAILED(hr)) {
 518         dsound_logerr(hr, "Could not get capture buffer position\n");
 519         *size = 0;
 520         return NULL;
 521     }
 522
 523     req_size = audio_ring_dist(cpos, hw->pos_emul, hw->size_emul);
 524     req_size = MIN(req_size, hw->size_emul - hw->pos_emul);
 525
 526     err = dsound_lock_in(dscb, &hw->info, hw->pos_emul, req_size, &ret, NULL,
 527                          &act_size, NULL, false, ds->s);
 528     if (err) {
 529         dolog("Failed to lock buffer\n");
 530         *size = 0;
 531         return NULL;
 532     }
 533
 534     *size = act_size;
 535     return ret;
 536 }
 537
 538 static void dsound_put_buffer_in(HWVoiceIn *hw, void *buf, size_t len)
 539 {
 540     DSoundVoiceIn *ds = (DSoundVoiceIn *) hw;
 541     LPDIRECTSOUNDCAPTUREBUFFER dscb = ds->dsound_capture_buffer;
 542     int err = dsound_unlock_in(dscb, buf, NULL, len, 0);
 543
 544     if (err) {
 545         dolog("Failed to unlock buffer!!\n");
 546         return;
 547     }
 548     hw->pos_emul = (hw->pos_emul + len) % hw->size_emul;
 549 }
 550
 551 static void dsound_audio_fini (void *opaque)
 552 {
 553     HRESULT hr;
 554     dsound *s = opaque;
 555
 556     if (!s->dsound) {
 557         g_free(s);
 558         return;
 559     }
 560
 561     hr = IDirectSound_Release (s->dsound);
 562     if (FAILED (hr)) {
 563         dsound_logerr (hr, "Could not release DirectSound\n");
 564     }
 565     s->dsound = NULL;
 566
 567     if (!s->dsound_capture) {
 568         g_free(s);
 569         return;
 570     }
 571
 572     hr = IDirectSoundCapture_Release (s->dsound_capture);
 573     if (FAILED (hr)) {
 574         dsound_logerr (hr, "Could not release DirectSoundCapture\n");
 575     }
 576     s->dsound_capture = NULL;
 577
 578     g_free(s);
 579 }
 580
 581 static void *dsound_audio_init(Audiodev *dev)
 582 {
 583     int err;
 584     HRESULT hr;
 585     dsound *s = g_malloc0(sizeof(dsound));
 586     AudiodevDsoundOptions *dso;
 587
 588     assert(dev->driver == AUDIODEV_DRIVER_DSOUND);
 589     s->dev = dev;
 590     dso = &dev->u.dsound;
 591
 592     if (!dso->has_latency) {
 593         dso->has_latency = true;
 594         dso->latency = 10000; /* 10 ms */
 595     }
 596
 597     hr = CoInitialize (NULL);
 598     if (FAILED (hr)) {
 599         dsound_logerr (hr, "Could not initialize COM\n");
 600         g_free(s);
 601         return NULL;
 602     }
 603
 604     hr = CoCreateInstance (
 605         &CLSID_DirectSound,
 606         NULL,
 607         CLSCTX_ALL,
 608         &IID_IDirectSound,
 609         (void **) &s->dsound
 610         );
 611     if (FAILED (hr)) {
 612         dsound_logerr (hr, "Could not create DirectSound instance\n");
 613         g_free(s);
 614         return NULL;
 615     }
 616
 617     hr = IDirectSound_Initialize (s->dsound, NULL);
 618     if (FAILED (hr)) {
 619         dsound_logerr (hr, "Could not initialize DirectSound\n");
 620
 621         hr = IDirectSound_Release (s->dsound);
 622         if (FAILED (hr)) {
 623             dsound_logerr (hr, "Could not release DirectSound\n");
 624         }
 625         g_free(s);
 626         return NULL;
 627     }
 628
 629     hr = CoCreateInstance (
 630         &CLSID_DirectSoundCapture,
 631         NULL,
 632         CLSCTX_ALL,
 633         &IID_IDirectSoundCapture,
 634         (void **) &s->dsound_capture
 635         );
 636     if (FAILED (hr)) {
 637         dsound_logerr (hr, "Could not create DirectSoundCapture instance\n");
 638     }
 639     else {
 640         hr = IDirectSoundCapture_Initialize (s->dsound_capture, NULL);
 641         if (FAILED (hr)) {
 642             dsound_logerr (hr, "Could not initialize DirectSoundCapture\n");
 643
 644             hr = IDirectSoundCapture_Release (s->dsound_capture);
 645             if (FAILED (hr)) {
 646                 dsound_logerr (hr, "Could not release DirectSoundCapture\n");
 647             }
 648             s->dsound_capture = NULL;
 649         }
 650     }
 651
 652     err = dsound_open (s);
 653     if (err) {
 654         dsound_audio_fini (s);
 655         return NULL;
 656     }
 657
 658     return s;
 659 }
 660
 661 static struct audio_pcm_ops dsound_pcm_ops = {
 662     .init_out = dsound_init_out,
 663     .fini_out = dsound_fini_out,
 664     .write    = audio_generic_write,
 665     .get_buffer_out = dsound_get_buffer_out,
 666     .put_buffer_out = dsound_put_buffer_out,
 667     .enable_out = dsound_enable_out,
 668
 669     .init_in  = dsound_init_in,
 670     .fini_in  = dsound_fini_in,
 671     .read     = audio_generic_read,
 672     .get_buffer_in = dsound_get_buffer_in,
 673     .put_buffer_in = dsound_put_buffer_in,
 674     .enable_in = dsound_enable_in,
 675 };
 676
 677 static struct audio_driver dsound_audio_driver = {
 678     .name           = "dsound",
 679     .descr          = "DirectSound http://wikipedia.org/wiki/DirectSound",
 680     .init           = dsound_audio_init,
 681     .fini           = dsound_audio_fini,
 682     .pcm_ops        = &dsound_pcm_ops,
 683     .can_be_default = 1,
 684     .max_voices_out = INT_MAX,
 685     .max_voices_in  = 1,
 686     .voice_size_out = sizeof (DSoundVoiceOut),
 687     .voice_size_in  = sizeof (DSoundVoiceIn)
 688 };
 689
 690 static void register_audio_dsound(void)
 691 {
 692     audio_driver_register(&dsound_audio_driver);
 693 }
 694 type_init(register_audio_dsound);