snd_win.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20 #include "quakedef.h"
  21 #include "winquake.h"
  22
  23 #define iDirectSoundCreate(a,b,c)       pDirectSoundCreate(a,b,c)
  24
  25 HRESULT (WINAPI *pDirectSoundCreate)(GUID FAR *lpGUID, LPDIRECTSOUND FAR *lplpDS, IUnknown FAR *pUnkOuter);
  26
  27 // 64K is > 1 second at 16-bit, 22050 Hz
  28 #define WAV_BUFFERS                             64
  29 #define WAV_MASK                                0x3F
  30 #define WAV_BUFFER_SIZE                 0x0400
  31 #define SECONDARY_BUFFER_SIZE   0x10000
  32
  33 typedef enum {SIS_SUCCESS, SIS_FAILURE, SIS_NOTAVAIL} sndinitstat;
  34
  35 static qboolean wavonly;
  36 static qboolean dsound_init;
  37 static qboolean wav_init;
  38 static qboolean snd_firsttime = true, snd_isdirect, snd_iswave;
  39 static qboolean primary_format_set;
  40
  41 static int      sample16;
  42 static int      snd_sent, snd_completed;
  43
  44
  45 /*
  46  * Global variables. Must be visible to window-procedure function
  47  *  so it can unlock and free the data block after it has been played.
  48  */
  49
  50 HANDLE          hData;
  51 HPSTR           lpData, lpData2;
  52
  53 HGLOBAL         hWaveHdr;
  54 LPWAVEHDR       lpWaveHdr;
  55
  56 HWAVEOUT    hWaveOut;
  57
  58 WAVEOUTCAPS     wavecaps;
  59
  60 DWORD   gSndBufSize;
  61
  62 MMTIME          mmstarttime;
  63
  64 LPDIRECTSOUND pDS;
  65 LPDIRECTSOUNDBUFFER pDSBuf, pDSPBuf;
  66
  67 HINSTANCE hInstDS;
  68
  69 qboolean SNDDMA_InitWav (void);
  70 sndinitstat SNDDMA_InitDirect (void);
  71
  72 /*
  73 ==================
  74 S_BlockSound
  75 ==================
  76 */
  77 void S_BlockSound (void)
  78 {
  79
  80 // DirectSound takes care of blocking itself
  81         if (snd_iswave)
  82         {
  83                 snd_blocked++;
  84
  85                 if (snd_blocked == 1)
  86                 {
  87                         waveOutReset (hWaveOut);
  88                 }
  89         }
  90 }
  91
  92
  93 /*
  94 ==================
  95 S_UnblockSound
  96 ==================
  97 */
  98 void S_UnblockSound (void)
  99 {
 100
 101 // DirectSound takes care of blocking itself
 102         if (snd_iswave)
 103         {
 104                 snd_blocked--;
 105         }
 106 }
 107
 108
 109 /*
 110 ==================
 111 FreeSound
 112 ==================
 113 */
 114 void FreeSound (void)
 115 {
 116         int             i;
 117
 118         if (pDSBuf)
 119         {
 120                 pDSBuf->lpVtbl->Stop(pDSBuf);
 121                 pDSBuf->lpVtbl->Release(pDSBuf);
 122         }
 123
 124 // only release primary buffer if it's not also the mixing buffer we just released
 125         if (pDSPBuf && (pDSBuf != pDSPBuf))
 126         {
 127                 pDSPBuf->lpVtbl->Release(pDSPBuf);
 128         }
 129
 130         if (pDS)
 131         {
 132                 pDS->lpVtbl->SetCooperativeLevel (pDS, mainwindow, DSSCL_NORMAL);
 133                 pDS->lpVtbl->Release(pDS);
 134         }
 135
 136         if (hWaveOut)
 137         {
 138                 waveOutReset (hWaveOut);
 139
 140                 if (lpWaveHdr)
 141                 {
 142                         for (i=0 ; i< WAV_BUFFERS ; i++)
 143                                 waveOutUnprepareHeader (hWaveOut, lpWaveHdr+i, sizeof(WAVEHDR));
 144                 }
 145
 146                 waveOutClose (hWaveOut);
 147
 148                 if (hWaveHdr)
 149                 {
 150                         GlobalUnlock(hWaveHdr);
 151                         GlobalFree(hWaveHdr);
 152                 }
 153
 154                 if (hData)
 155                 {
 156                         GlobalUnlock(hData);
 157                         GlobalFree(hData);
 158                 }
 159
 160         }
 161
 162         pDS = NULL;
 163         pDSBuf = NULL;
 164         pDSPBuf = NULL;
 165         hWaveOut = 0;
 166         hData = 0;
 167         hWaveHdr = 0;
 168         lpData = NULL;
 169         lpWaveHdr = NULL;
 170         dsound_init = false;
 171         wav_init = false;
 172 }
 173
 174
 175 /*
 176 ==================
 177 SNDDMA_InitDirect
 178
 179 Direct-Sound support
 180 ==================
 181 */
 182 sndinitstat SNDDMA_InitDirect (void)
 183 {
 184         DSBUFFERDESC    dsbuf;
 185         DSBCAPS                 dsbcaps;
 186         DWORD                   dwSize, dwWrite;
 187         DSCAPS                  dscaps;
 188         WAVEFORMATEX    format, pformat;
 189         HRESULT                 hresult;
 190         int                             reps;
 191         int i;
 192
 193         memset ((void *)&sn, 0, sizeof (sn));
 194
 195         shm = &sn;
 196
 197         shm->channels = 2;
 198         shm->samplebits = 16;
 199         i = COM_CheckParm ("-sndspeed"); // LordHavoc: -sndspeed option
 200         if (i && i != (com_argc - 1))
 201                 shm->speed = atoi(com_argv[i+1]);
 202         else
 203                 shm->speed = 11025;
 204
 205         memset (&format, 0, sizeof(format));
 206         format.wFormatTag = WAVE_FORMAT_PCM;
 207     format.nChannels = shm->channels;
 208     format.wBitsPerSample = shm->samplebits;
 209     format.nSamplesPerSec = shm->speed;
 210     format.nBlockAlign = format.nChannels * format.wBitsPerSample / 8;
 211     format.cbSize = 0;
 212     format.nAvgBytesPerSec = format.nSamplesPerSec * format.nBlockAlign;
 213
 214         if (!hInstDS)
 215         {
 216                 hInstDS = LoadLibrary("dsound.dll");
 217
 218                 if (hInstDS == NULL)
 219                 {
 220                         Con_SafePrintf ("Couldn't load dsound.dll\n");
 221                         return SIS_FAILURE;
 222                 }
 223
 224                 pDirectSoundCreate = (void *)GetProcAddress(hInstDS,"DirectSoundCreate");
 225
 226                 if (!pDirectSoundCreate)
 227                 {
 228                         Con_SafePrintf ("Couldn't get DS proc addr\n");
 229                         return SIS_FAILURE;
 230                 }
 231         }
 232
 233         while ((hresult = iDirectSoundCreate(NULL, &pDS, NULL)) != DS_OK)
 234         {
 235                 if (hresult != DSERR_ALLOCATED)
 236                 {
 237                         Con_SafePrintf ("DirectSound create failed\n");
 238                         return SIS_FAILURE;
 239                 }
 240
 241                 if (MessageBox (NULL,
 242                                                 "The sound hardware is in use by another app.\n\n"
 243                                             "Select Retry to try to start sound again or Cancel to run Quake with no sound.",
 244                                                 "Sound not available",
 245                                                 MB_RETRYCANCEL | MB_SETFOREGROUND | MB_ICONEXCLAMATION) != IDRETRY)
 246                 {
 247                         Con_SafePrintf ("DirectSoundCreate failure\n"
 248                                                         "  hardware already in use\n");
 249                         return SIS_NOTAVAIL;
 250                 }
 251         }
 252
 253         dscaps.dwSize = sizeof(dscaps);
 254
 255         if (DS_OK != pDS->lpVtbl->GetCaps (pDS, &dscaps))
 256         {
 257                 Con_SafePrintf ("Couldn't get DS caps\n");
 258         }
 259
 260         if (dscaps.dwFlags & DSCAPS_EMULDRIVER)
 261         {
 262                 Con_SafePrintf ("No DirectSound driver installed\n");
 263                 FreeSound ();
 264                 return SIS_FAILURE;
 265         }
 266
 267         if (DS_OK != pDS->lpVtbl->SetCooperativeLevel (pDS, mainwindow, DSSCL_EXCLUSIVE))
 268         {
 269                 Con_SafePrintf ("Set coop level failed\n");
 270                 FreeSound ();
 271                 return SIS_FAILURE;
 272         }
 273
 274 // get access to the primary buffer, if possible, so we can set the
 275 // sound hardware format
 276         memset (&dsbuf, 0, sizeof(dsbuf));
 277         dsbuf.dwSize = sizeof(DSBUFFERDESC);
 278         dsbuf.dwFlags = DSBCAPS_PRIMARYBUFFER;
 279         dsbuf.dwBufferBytes = 0;
 280         dsbuf.lpwfxFormat = NULL;
 281
 282         memset(&dsbcaps, 0, sizeof(dsbcaps));
 283         dsbcaps.dwSize = sizeof(dsbcaps);
 284         primary_format_set = false;
 285
 286         if (!COM_CheckParm ("-snoforceformat"))
 287         {
 288                 if (DS_OK == pDS->lpVtbl->CreateSoundBuffer(pDS, &dsbuf, &pDSPBuf, NULL))
 289                 {
 290                         pformat = format;
 291
 292                         if (DS_OK != pDSPBuf->lpVtbl->SetFormat (pDSPBuf, &pformat))
 293                         {
 294                                 if (snd_firsttime)
 295                                         Con_SafePrintf ("Set primary sound buffer format: no\n");
 296                         }
 297                         else
 298                         {
 299                                 if (snd_firsttime)
 300                                         Con_SafePrintf ("Set primary sound buffer format: yes\n");
 301
 302                                 primary_format_set = true;
 303                         }
 304                 }
 305         }
 306
 307         if (!primary_format_set || !COM_CheckParm ("-primarysound"))
 308         {
 309         // create the secondary buffer we'll actually work with
 310                 memset (&dsbuf, 0, sizeof(dsbuf));
 311                 dsbuf.dwSize = sizeof(DSBUFFERDESC);
 312                 dsbuf.dwFlags = DSBCAPS_CTRLFREQUENCY | DSBCAPS_LOCSOFTWARE;
 313                 dsbuf.dwBufferBytes = SECONDARY_BUFFER_SIZE;
 314                 dsbuf.lpwfxFormat = &format;
 315
 316                 memset(&dsbcaps, 0, sizeof(dsbcaps));
 317                 dsbcaps.dwSize = sizeof(dsbcaps);
 318
 319                 if (DS_OK != pDS->lpVtbl->CreateSoundBuffer(pDS, &dsbuf, &pDSBuf, NULL))
 320                 {
 321                         Con_SafePrintf ("DS:CreateSoundBuffer Failed");
 322                         FreeSound ();
 323                         return SIS_FAILURE;
 324                 }
 325
 326                 shm->channels = format.nChannels;
 327                 shm->samplebits = format.wBitsPerSample;
 328                 shm->speed = format.nSamplesPerSec;
 329
 330                 if (DS_OK != pDSBuf->lpVtbl->GetCaps (pDSBuf, &dsbcaps))
 331                 {
 332                         Con_SafePrintf ("DS:GetCaps failed\n");
 333                         FreeSound ();
 334                         return SIS_FAILURE;
 335                 }
 336
 337                 if (snd_firsttime)
 338                         Con_SafePrintf ("Using secondary sound buffer\n");
 339         }
 340         else
 341         {
 342                 if (DS_OK != pDS->lpVtbl->SetCooperativeLevel (pDS, mainwindow, DSSCL_WRITEPRIMARY))
 343                 {
 344                         Con_SafePrintf ("Set coop level failed\n");
 345                         FreeSound ();
 346                         return SIS_FAILURE;
 347                 }
 348
 349                 if (DS_OK != pDSPBuf->lpVtbl->GetCaps (pDSPBuf, &dsbcaps))
 350                 {
 351                         Con_Printf ("DS:GetCaps failed\n");
 352                         return SIS_FAILURE;
 353                 }
 354
 355                 pDSBuf = pDSPBuf;
 356                 Con_SafePrintf ("Using primary sound buffer\n");
 357         }
 358
 359         // Make sure mixer is active
 360         pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);
 361
 362         if (snd_firsttime)
 363                 Con_SafePrintf("   %d channel(s)\n"
 364                                "   %d bits/sample\n"
 365                                            "   %d samples/sec\n",
 366                                            shm->channels, shm->samplebits, shm->speed);
 367
 368         gSndBufSize = dsbcaps.dwBufferBytes;
 369
 370 // initialize the buffer
 371         reps = 0;
 372
 373         while ((hresult = pDSBuf->lpVtbl->Lock(pDSBuf, 0, gSndBufSize, &lpData, &dwSize, NULL, NULL, 0)) != DS_OK)
 374         {
 375                 if (hresult != DSERR_BUFFERLOST)
 376                 {
 377                         Con_SafePrintf ("SNDDMA_InitDirect: DS::Lock Sound Buffer Failed\n");
 378                         FreeSound ();
 379                         return SIS_FAILURE;
 380                 }
 381
 382                 if (++reps > 10000)
 383                 {
 384                         Con_SafePrintf ("SNDDMA_InitDirect: DS: couldn't restore buffer\n");
 385                         FreeSound ();
 386                         return SIS_FAILURE;
 387                 }
 388
 389         }
 390
 391         memset(lpData, 0, dwSize);
 392
 393         pDSBuf->lpVtbl->Unlock(pDSBuf, lpData, dwSize, NULL, 0);
 394
 395         /* we don't want anyone to access the buffer directly w/o locking it first. */
 396         lpData = NULL;
 397
 398         pDSBuf->lpVtbl->Stop(pDSBuf);
 399         pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &mmstarttime.u.sample, &dwWrite);
 400         pDSBuf->lpVtbl->Play(pDSBuf, 0, 0, DSBPLAY_LOOPING);
 401
 402         shm->soundalive = true;
 403         shm->splitbuffer = false;
 404         shm->samples = gSndBufSize/(shm->samplebits/8);
 405         shm->samplepos = 0;
 406         shm->submission_chunk = 1;
 407         shm->buffer = (unsigned char *) lpData;
 408         sample16 = (shm->samplebits/8) - 1;
 409
 410         dsound_init = true;
 411
 412         return SIS_SUCCESS;
 413 }
 414
 415
 416 /*
 417 ==================
 418 SNDDM_InitWav
 419
 420 Crappy windows multimedia base
 421 ==================
 422 */
 423 qboolean SNDDMA_InitWav (void)
 424 {
 425         WAVEFORMATEX  format;
 426         int                             i;
 427         HRESULT                 hr;
 428
 429         snd_sent = 0;
 430         snd_completed = 0;
 431
 432         shm = &sn;
 433
 434         shm->channels = 2;
 435         shm->samplebits = 16;
 436         i = COM_CheckParm ("-sndspeed"); // LordHavoc: -sndspeed option
 437         if (i && i != (com_argc - 1))
 438                 shm->speed = atoi(com_argv[i+1]);
 439         else
 440                 shm->speed = 11025;
 441
 442         memset (&format, 0, sizeof(format));
 443         format.wFormatTag = WAVE_FORMAT_PCM;
 444         format.nChannels = shm->channels;
 445         format.wBitsPerSample = shm->samplebits;
 446         format.nSamplesPerSec = shm->speed;
 447         format.nBlockAlign = format.nChannels
 448                 *format.wBitsPerSample / 8;
 449         format.cbSize = 0;
 450         format.nAvgBytesPerSec = format.nSamplesPerSec
 451                 *format.nBlockAlign;
 452
 453         /* Open a waveform device for output using window callback. */
 454         while ((hr = waveOutOpen((LPHWAVEOUT)&hWaveOut, WAVE_MAPPER,
 455                                         &format,
 456                                         0, 0L, CALLBACK_NULL)) != MMSYSERR_NOERROR)
 457         {
 458                 if (hr != MMSYSERR_ALLOCATED)
 459                 {
 460                         Con_SafePrintf ("waveOutOpen failed\n");
 461                         return false;
 462                 }
 463
 464                 if (MessageBox (NULL,
 465                                                 "The sound hardware is in use by another app.\n\n"
 466                                             "Select Retry to try to start sound again or Cancel to run Quake with no sound.",
 467                                                 "Sound not available",
 468                                                 MB_RETRYCANCEL | MB_SETFOREGROUND | MB_ICONEXCLAMATION) != IDRETRY)
 469                 {
 470                         Con_SafePrintf ("waveOutOpen failure;\n"
 471                                                         "  hardware already in use\n");
 472                         return false;
 473                 }
 474         }
 475
 476         /*
 477          * Allocate and lock memory for the waveform data. The memory
 478          * for waveform data must be globally allocated with
 479          * GMEM_MOVEABLE and GMEM_SHARE flags.
 480
 481         */
 482         gSndBufSize = WAV_BUFFERS*WAV_BUFFER_SIZE;
 483         hData = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, gSndBufSize);
 484         if (!hData)
 485         {
 486                 Con_SafePrintf ("Sound: Out of memory.\n");
 487                 FreeSound ();
 488                 return false;
 489         }
 490         lpData = GlobalLock(hData);
 491         if (!lpData)
 492         {
 493                 Con_SafePrintf ("Sound: Failed to lock.\n");
 494                 FreeSound ();
 495                 return false;
 496         }
 497         memset (lpData, 0, gSndBufSize);
 498
 499         /*
 500          * Allocate and lock memory for the header. This memory must
 501          * also be globally allocated with GMEM_MOVEABLE and
 502          * GMEM_SHARE flags.
 503          */
 504         hWaveHdr = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE,
 505                 (DWORD) sizeof(WAVEHDR) * WAV_BUFFERS);
 506
 507         if (hWaveHdr == NULL)
 508         {
 509                 Con_SafePrintf ("Sound: Failed to Alloc header.\n");
 510                 FreeSound ();
 511                 return false;
 512         }
 513
 514         lpWaveHdr = (LPWAVEHDR) GlobalLock(hWaveHdr);
 515
 516         if (lpWaveHdr == NULL)
 517         {
 518                 Con_SafePrintf ("Sound: Failed to lock header.\n");
 519                 FreeSound ();
 520                 return false;
 521         }
 522
 523         memset (lpWaveHdr, 0, sizeof(WAVEHDR) * WAV_BUFFERS);
 524
 525         /* After allocation, set up and prepare headers. */
 526         for (i=0 ; i<WAV_BUFFERS ; i++)
 527         {
 528                 lpWaveHdr[i].dwBufferLength = WAV_BUFFER_SIZE;
 529                 lpWaveHdr[i].lpData = lpData + i*WAV_BUFFER_SIZE;
 530
 531                 if (waveOutPrepareHeader(hWaveOut, lpWaveHdr+i, sizeof(WAVEHDR)) !=
 532                                 MMSYSERR_NOERROR)
 533                 {
 534                         Con_SafePrintf ("Sound: failed to prepare wave headers\n");
 535                         FreeSound ();
 536                         return false;
 537                 }
 538         }
 539
 540         shm->soundalive = true;
 541         shm->splitbuffer = false;
 542         shm->samples = gSndBufSize/(shm->samplebits/8);
 543         shm->samplepos = 0;
 544         shm->submission_chunk = 1;
 545         shm->buffer = (unsigned char *) lpData;
 546         sample16 = (shm->samplebits/8) - 1;
 547
 548         wav_init = true;
 549
 550         return true;
 551 }
 552
 553 /*
 554 ==================
 555 SNDDMA_Init
 556
 557 Try to find a sound device to mix for.
 558 Returns false if nothing is found.
 559 ==================
 560 */
 561
 562 qboolean SNDDMA_Init(void)
 563 {
 564         sndinitstat     stat;
 565
 566         if (COM_CheckParm ("-wavonly"))
 567                 wavonly = true;
 568
 569         dsound_init = wav_init = 0;
 570
 571         stat = SIS_FAILURE;     // assume DirectSound won't initialize
 572
 573         /* Init DirectSound */
 574         if (!wavonly)
 575         {
 576                 if (snd_firsttime || snd_isdirect)
 577                 {
 578                         stat = SNDDMA_InitDirect ();;
 579
 580                         if (stat == SIS_SUCCESS)
 581                         {
 582                                 snd_isdirect = true;
 583
 584                                 if (snd_firsttime)
 585                                         Con_SafePrintf ("DirectSound initialized\n");
 586                         }
 587                         else
 588                         {
 589                                 snd_isdirect = false;
 590                                 Con_SafePrintf ("DirectSound failed to init\n");
 591                         }
 592                 }
 593         }
 594
 595 // if DirectSound didn't succeed in initializing, try to initialize
 596 // waveOut sound, unless DirectSound failed because the hardware is
 597 // already allocated (in which case the user has already chosen not
 598 // to have sound)
 599         if (!dsound_init && (stat != SIS_NOTAVAIL))
 600         {
 601                 if (snd_firsttime || snd_iswave)
 602                 {
 603
 604                         snd_iswave = SNDDMA_InitWav ();
 605
 606                         if (snd_iswave)
 607                         {
 608                                 if (snd_firsttime)
 609                                         Con_SafePrintf ("Wave sound initialized\n");
 610                         }
 611                         else
 612                         {
 613                                 Con_SafePrintf ("Wave sound failed to init\n");
 614                         }
 615                 }
 616         }
 617
 618         snd_firsttime = false;
 619
 620         if (!dsound_init && !wav_init)
 621                 return 0;
 622
 623         return 1;
 624 }
 625
 626 /*
 627 ==============
 628 SNDDMA_GetDMAPos
 629
 630 return the current sample position (in mono samples read)
 631 inside the recirculating dma buffer, so the mixing code will know
 632 how many sample are required to fill it up.
 633 ===============
 634 */
 635 int SNDDMA_GetDMAPos(void)
 636 {
 637         MMTIME  mmtime;
 638         int             s;
 639         DWORD   dwWrite;
 640
 641         if (dsound_init)
 642         {
 643                 mmtime.wType = TIME_SAMPLES;
 644                 pDSBuf->lpVtbl->GetCurrentPosition(pDSBuf, &mmtime.u.sample, &dwWrite);
 645                 s = mmtime.u.sample - mmstarttime.u.sample;
 646         }
 647         else if (wav_init)
 648         {
 649                 s = snd_sent * WAV_BUFFER_SIZE;
 650         }
 651         else
 652                 s = 0;
 653
 654
 655         s >>= sample16;
 656
 657         s &= (shm->samples-1);
 658
 659         return s;
 660 }
 661
 662 /*
 663 ==============
 664 SNDDMA_Submit
 665
 666 Send sound to device if buffer isn't really the dma buffer
 667 ===============
 668 */
 669 void SNDDMA_Submit(void)
 670 {
 671         LPWAVEHDR       h;
 672         int                     wResult;
 673
 674         if (!wav_init)
 675                 return;
 676
 677         //
 678         // find which sound blocks have completed
 679         //
 680         while (1)
 681         {
 682                 if ( snd_completed == snd_sent )
 683                 {
 684                         Con_DPrintf ("Sound overrun\n");
 685                         break;
 686                 }
 687
 688                 if ( ! (lpWaveHdr[ snd_completed & WAV_MASK].dwFlags & WHDR_DONE) )
 689                 {
 690                         break;
 691                 }
 692
 693                 snd_completed++;        // this buffer has been played
 694         }
 695
 696         //
 697         // submit two new sound blocks
 698         //
 699         while (((snd_sent - snd_completed) >> sample16) < 4)
 700         {
 701                 h = lpWaveHdr + ( snd_sent&WAV_MASK );
 702
 703                 snd_sent++;
 704                 /*
 705                  * Now the data block can be sent to the output device. The
 706                  * waveOutWrite function returns immediately and waveform
 707                  * data is sent to the output device in the background.
 708                  */
 709                 wResult = waveOutWrite(hWaveOut, h, sizeof(WAVEHDR));
 710
 711                 if (wResult != MMSYSERR_NOERROR)
 712                 {
 713                         Con_SafePrintf ("Failed to write block to device\n");
 714                         FreeSound ();
 715                         return;
 716                 }
 717         }
 718 }
 719
 720 /*
 721 ==============
 722 SNDDMA_Shutdown
 723
 724 Reset the sound device for exiting
 725 ===============
 726 */
 727 void SNDDMA_Shutdown(void)
 728 {
 729         FreeSound ();
 730 }
 731