Mercurial > sdl-ios-xcode
annotate src/audio/windx5/SDL_dx5audio.c @ 375:17976f0f503f
Use secondary audio buffers to avoid problems on various soundcards
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 19 May 2002 22:34:36 +0000 |
| parents | f6ffac90895c |
| children | a6fa62b1be09 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Allow access to a raw mixing buffer */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 | |
| 32 #include "SDL_types.h" | |
| 33 #include "SDL_error.h" | |
| 34 #include "SDL_timer.h" | |
| 35 #include "SDL_audio.h" | |
| 36 #include "SDL_audio_c.h" | |
| 37 #include "SDL_dx5audio.h" | |
| 38 | |
| 39 /* Define this if you want to use DirectX 6 DirectSoundNotify interface */ | |
| 40 //#define USE_POSITION_NOTIFY | |
| 41 | |
| 42 /* DirectX function pointers for audio */ | |
| 43 HRESULT (WINAPI *DSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN); | |
| 44 | |
| 45 /* Audio driver functions */ | |
| 46 static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 47 static void DX5_ThreadInit(_THIS); | |
| 48 static void DX5_WaitAudio_BusyWait(_THIS); | |
| 49 #ifdef USE_POSITION_NOTIFY | |
| 50 static void DX6_WaitAudio_EventWait(_THIS); | |
| 51 #endif | |
| 52 static void DX5_PlayAudio(_THIS); | |
| 53 static Uint8 *DX5_GetAudioBuf(_THIS); | |
| 54 static void DX5_WaitDone(_THIS); | |
| 55 static void DX5_CloseAudio(_THIS); | |
| 56 | |
| 57 /* Audio driver bootstrap functions */ | |
| 58 | |
| 59 static int Audio_Available(void) | |
| 60 { | |
| 61 HINSTANCE DSoundDLL; | |
| 62 int dsound_ok; | |
| 63 | |
| 64 /* Version check DSOUND.DLL (Is DirectX okay?) */ | |
| 65 dsound_ok = 0; | |
| 66 DSoundDLL = LoadLibrary("DSOUND.DLL"); | |
| 67 if ( DSoundDLL != NULL ) { | |
| 68 /* We just use basic DirectSound, we're okay */ | |
| 69 /* Yay! */ | |
| 70 /* Unfortunately, the sound drivers on NT have | |
| 71 higher latencies than the audio buffers used | |
| 72 by many SDL applications, so there are gaps | |
| 73 in the audio - it sounds terrible. Punt for now. | |
| 74 */ | |
| 75 OSVERSIONINFO ver; | |
| 76 ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO); | |
| 77 GetVersionEx(&ver); | |
| 78 switch (ver.dwPlatformId) { | |
| 79 case VER_PLATFORM_WIN32_NT: | |
| 80 if ( ver.dwMajorVersion > 4 ) { | |
| 81 /* Win2K */ | |
| 82 dsound_ok = 1; | |
| 83 } else { | |
| 84 /* WinNT */ | |
| 85 dsound_ok = 0; | |
| 86 } | |
| 87 break; | |
| 88 default: | |
| 89 /* Win95 or Win98 */ | |
| 90 dsound_ok = 1; | |
| 91 break; | |
| 92 } | |
| 93 /* Now check for DirectX 5 or better - otherwise | |
| 94 * we will fail later in DX5_OpenAudio without a chance | |
| 95 * to fall back to the DIB driver. */ | |
| 96 if (dsound_ok) { | |
| 97 /* DirectSoundCaptureCreate was added in DX5 */ | |
| 98 if (!GetProcAddress(DSoundDLL, "DirectSoundCaptureCreate")) | |
| 99 dsound_ok = 0; | |
| 100 | |
| 101 } | |
| 102 /* Clean up.. */ | |
| 103 FreeLibrary(DSoundDLL); | |
| 104 } | |
| 105 return(dsound_ok); | |
| 106 } | |
| 107 | |
| 108 /* Functions for loading the DirectX functions dynamically */ | |
| 109 static HINSTANCE DSoundDLL = NULL; | |
| 110 | |
| 111 static void DX5_Unload(void) | |
| 112 { | |
| 113 if ( DSoundDLL != NULL ) { | |
| 114 FreeLibrary(DSoundDLL); | |
| 115 DSoundCreate = NULL; | |
| 116 DSoundDLL = NULL; | |
| 117 } | |
| 118 } | |
| 119 static int DX5_Load(void) | |
| 120 { | |
| 121 int status; | |
| 122 | |
| 123 DX5_Unload(); | |
| 124 DSoundDLL = LoadLibrary("DSOUND.DLL"); | |
| 125 if ( DSoundDLL != NULL ) { | |
| 126 DSoundCreate = (void *)GetProcAddress(DSoundDLL, | |
| 127 "DirectSoundCreate"); | |
| 128 } | |
| 129 if ( DSoundDLL && DSoundCreate ) { | |
| 130 status = 0; | |
| 131 } else { | |
| 132 DX5_Unload(); | |
| 133 status = -1; | |
| 134 } | |
| 135 return status; | |
| 136 } | |
| 137 | |
| 138 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 139 { | |
| 140 DX5_Unload(); | |
| 141 free(device->hidden); | |
| 142 free(device); | |
| 143 } | |
| 144 | |
| 145 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 146 { | |
| 147 SDL_AudioDevice *this; | |
| 148 | |
| 149 /* Load DirectX */ | |
| 150 if ( DX5_Load() < 0 ) { | |
| 151 return(NULL); | |
| 152 } | |
| 153 | |
| 154 /* Initialize all variables that we clean on shutdown */ | |
| 155 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 156 if ( this ) { | |
| 157 memset(this, 0, (sizeof *this)); | |
| 158 this->hidden = (struct SDL_PrivateAudioData *) | |
| 159 malloc((sizeof *this->hidden)); | |
| 160 } | |
| 161 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 162 SDL_OutOfMemory(); | |
| 163 if ( this ) { | |
| 164 free(this); | |
| 165 } | |
| 166 return(0); | |
| 167 } | |
| 168 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 169 | |
| 170 /* Set the function pointers */ | |
| 171 this->OpenAudio = DX5_OpenAudio; | |
| 172 this->ThreadInit = DX5_ThreadInit; | |
| 173 this->WaitAudio = DX5_WaitAudio_BusyWait; | |
| 174 this->PlayAudio = DX5_PlayAudio; | |
| 175 this->GetAudioBuf = DX5_GetAudioBuf; | |
| 176 this->WaitDone = DX5_WaitDone; | |
| 177 this->CloseAudio = DX5_CloseAudio; | |
| 178 | |
| 179 this->free = Audio_DeleteDevice; | |
| 180 | |
| 181 return this; | |
| 182 } | |
| 183 | |
| 184 AudioBootStrap DSOUND_bootstrap = { | |
| 185 "dsound", "Win95/98/2000 DirectSound", | |
| 186 Audio_Available, Audio_CreateDevice | |
| 187 }; | |
| 188 | |
| 189 static void SetDSerror(const char *function, int code) | |
| 190 { | |
| 191 static const char *error; | |
| 192 static char errbuf[BUFSIZ]; | |
| 193 | |
| 194 errbuf[0] = 0; | |
| 195 switch (code) { | |
| 196 case E_NOINTERFACE: | |
| 197 error = | |
| 198 "Unsupported interface\n-- Is DirectX 5.0 or later installed?"; | |
| 199 break; | |
| 200 case DSERR_ALLOCATED: | |
| 201 error = "Audio device in use"; | |
| 202 break; | |
| 203 case DSERR_BADFORMAT: | |
| 204 error = "Unsupported audio format"; | |
| 205 break; | |
| 206 case DSERR_BUFFERLOST: | |
| 207 error = "Mixing buffer was lost"; | |
| 208 break; | |
| 209 case DSERR_CONTROLUNAVAIL: | |
| 210 error = "Control requested is not available"; | |
| 211 break; | |
| 212 case DSERR_INVALIDCALL: | |
| 213 error = "Invalid call for the current state"; | |
| 214 break; | |
| 215 case DSERR_INVALIDPARAM: | |
| 216 error = "Invalid parameter"; | |
| 217 break; | |
| 218 case DSERR_NODRIVER: | |
| 219 error = "No audio device found"; | |
| 220 break; | |
| 221 case DSERR_OUTOFMEMORY: | |
| 222 error = "Out of memory"; | |
| 223 break; | |
| 224 case DSERR_PRIOLEVELNEEDED: | |
| 225 error = "Caller doesn't have priority"; | |
| 226 break; | |
| 227 case DSERR_UNSUPPORTED: | |
| 228 error = "Function not supported"; | |
| 229 break; | |
| 230 default: | |
| 231 sprintf(errbuf, "%s: Unknown DirectSound error: 0x%x", | |
| 232 function, code); | |
| 233 break; | |
| 234 } | |
| 235 if ( ! errbuf[0] ) { | |
| 236 sprintf(errbuf, "%s: %s", function, error); | |
| 237 } | |
| 238 SDL_SetError("%s", errbuf); | |
| 239 return; | |
| 240 } | |
| 241 | |
| 242 /* DirectSound needs to be associated with a window */ | |
| 243 static HWND mainwin = NULL; | |
| 244 /* */ | |
| 245 void DX5_SoundFocus(HWND hwnd) | |
| 246 { | |
| 247 mainwin = hwnd; | |
| 248 } | |
| 249 | |
| 250 static void DX5_ThreadInit(_THIS) | |
| 251 { | |
| 252 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST); | |
| 253 } | |
| 254 | |
| 255 static void DX5_WaitAudio_BusyWait(_THIS) | |
| 256 { | |
| 257 DWORD status; | |
| 258 DWORD cursor, junk; | |
| 259 HRESULT result; | |
| 260 | |
| 261 /* Semi-busy wait, since we have no way of getting play notification | |
| 262 on a primary mixing buffer located in hardware (DirectX 5.0) | |
| 263 */ | |
| 264 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &cursor, &junk); | |
| 265 if ( result != DS_OK ) { | |
| 266 if ( result == DSERR_BUFFERLOST ) { | |
| 267 IDirectSoundBuffer_Restore(mixbuf); | |
| 268 } | |
| 269 #ifdef DEBUG_SOUND | |
| 270 SetDSerror("DirectSound GetCurrentPosition", result); | |
| 271 #endif | |
| 272 return; | |
| 273 } | |
| 274 cursor /= mixlen; | |
| 275 | |
| 276 while ( cursor == playing ) { | |
| 277 /* FIXME: find out how much time is left and sleep that long */ | |
| 278 SDL_Delay(10); | |
| 279 | |
| 280 /* Try to restore a lost sound buffer */ | |
| 281 IDirectSoundBuffer_GetStatus(mixbuf, &status); | |
| 282 if ( (status&DSBSTATUS_BUFFERLOST) ) { | |
| 283 IDirectSoundBuffer_Restore(mixbuf); | |
| 284 IDirectSoundBuffer_GetStatus(mixbuf, &status); | |
| 285 if ( (status&DSBSTATUS_BUFFERLOST) ) { | |
| 286 break; | |
| 287 } | |
| 288 } | |
| 289 if ( ! (status&DSBSTATUS_PLAYING) ) { | |
| 290 result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING); | |
| 291 if ( result == DS_OK ) { | |
| 292 continue; | |
| 293 } | |
| 294 #ifdef DEBUG_SOUND | |
| 295 SetDSerror("DirectSound Play", result); | |
| 296 #endif | |
| 297 return; | |
| 298 } | |
| 299 | |
| 300 /* Find out where we are playing */ | |
| 301 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, | |
| 302 &cursor, &junk); | |
| 303 if ( result != DS_OK ) { | |
| 304 SetDSerror("DirectSound GetCurrentPosition", result); | |
| 305 return; | |
| 306 } | |
| 307 cursor /= mixlen; | |
| 308 } | |
| 309 } | |
| 310 | |
| 311 #ifdef USE_POSITION_NOTIFY | |
| 312 static void DX6_WaitAudio_EventWait(_THIS) | |
| 313 { | |
| 314 DWORD status; | |
| 315 HRESULT result; | |
| 316 | |
| 317 /* Try to restore a lost sound buffer */ | |
| 318 IDirectSoundBuffer_GetStatus(mixbuf, &status); | |
| 319 if ( (status&DSBSTATUS_BUFFERLOST) ) { | |
| 320 IDirectSoundBuffer_Restore(mixbuf); | |
| 321 IDirectSoundBuffer_GetStatus(mixbuf, &status); | |
| 322 if ( (status&DSBSTATUS_BUFFERLOST) ) { | |
| 323 return; | |
| 324 } | |
| 325 } | |
| 326 if ( ! (status&DSBSTATUS_PLAYING) ) { | |
| 327 result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING); | |
| 328 if ( result != DS_OK ) { | |
| 329 #ifdef DEBUG_SOUND | |
| 330 SetDSerror("DirectSound Play", result); | |
| 331 #endif | |
| 332 return; | |
| 333 } | |
| 334 } | |
| 335 WaitForSingleObject(audio_event, INFINITE); | |
| 336 } | |
| 337 #endif /* USE_POSITION_NOTIFY */ | |
| 338 | |
| 339 static void DX5_PlayAudio(_THIS) | |
| 340 { | |
| 341 /* Unlock the buffer, allowing it to play */ | |
| 342 if ( locked_buf ) { | |
| 343 IDirectSoundBuffer_Unlock(mixbuf, locked_buf, mixlen, NULL, 0); | |
| 344 } | |
| 345 | |
| 346 } | |
| 347 | |
| 348 static Uint8 *DX5_GetAudioBuf(_THIS) | |
| 349 { | |
| 350 DWORD cursor, junk; | |
| 351 HRESULT result; | |
| 352 DWORD rawlen; | |
| 353 | |
| 354 /* Figure out which blocks to fill next */ | |
| 355 locked_buf = NULL; | |
| 356 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &cursor, &junk); | |
| 357 if ( result == DSERR_BUFFERLOST ) { | |
| 358 IDirectSoundBuffer_Restore(mixbuf); | |
| 359 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, | |
| 360 &cursor, &junk); | |
| 361 } | |
| 362 if ( result != DS_OK ) { | |
| 363 SetDSerror("DirectSound GetCurrentPosition", result); | |
| 364 return(NULL); | |
| 365 } | |
| 366 cursor /= mixlen; | |
| 367 playing = cursor; | |
| 368 cursor = (cursor+1)%NUM_BUFFERS; | |
| 369 cursor *= mixlen; | |
| 370 | |
| 371 /* Lock the audio buffer */ | |
| 372 result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen, | |
| 373 (LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0); | |
| 374 if ( result == DSERR_BUFFERLOST ) { | |
| 375 IDirectSoundBuffer_Restore(mixbuf); | |
| 376 result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen, | |
| 377 (LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0); | |
| 378 } | |
| 379 if ( result != DS_OK ) { | |
| 380 SetDSerror("DirectSound Lock", result); | |
| 381 return(NULL); | |
| 382 } | |
| 383 return(locked_buf); | |
| 384 } | |
| 385 | |
| 386 static void DX5_WaitDone(_THIS) | |
| 387 { | |
| 388 Uint8 *stream; | |
| 389 | |
| 390 /* Wait for the playing chunk to finish */ | |
| 391 stream = this->GetAudioBuf(this); | |
| 392 if ( stream != NULL ) { | |
| 393 memset(stream, silence, mixlen); | |
| 394 this->PlayAudio(this); | |
| 395 } | |
| 396 this->WaitAudio(this); | |
| 397 | |
| 398 /* Stop the looping sound buffer */ | |
| 399 IDirectSoundBuffer_Stop(mixbuf); | |
| 400 } | |
| 401 | |
| 402 static void DX5_CloseAudio(_THIS) | |
| 403 { | |
| 404 if ( sound != NULL ) { | |
| 405 if ( mixbuf != NULL ) { | |
| 406 /* Clean up the audio buffer */ | |
| 407 IDirectSoundBuffer_Release(mixbuf); | |
| 408 mixbuf = NULL; | |
| 409 } | |
| 410 if ( audio_event != NULL ) { | |
| 411 CloseHandle(audio_event); | |
| 412 audio_event = NULL; | |
| 413 } | |
| 414 IDirectSound_Release(sound); | |
| 415 sound = NULL; | |
| 416 } | |
| 417 } | |
| 418 | |
| 419 /* This function tries to create a primary audio buffer, and returns the | |
| 420 number of audio chunks available in the created buffer. | |
| 421 */ | |
| 422 static int CreatePrimary(LPDIRECTSOUND sndObj, HWND focus, | |
| 423 LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize) | |
| 424 { | |
| 425 HRESULT result; | |
| 426 DSBUFFERDESC format; | |
| 427 DSBCAPS caps; | |
| 428 int numchunks; | |
| 429 | |
| 430 /* Try to set primary mixing privileges */ | |
| 431 result = IDirectSound_SetCooperativeLevel(sndObj, focus, | |
| 432 DSSCL_WRITEPRIMARY); | |
| 433 if ( result != DS_OK ) { | |
| 434 #ifdef DEBUG_SOUND | |
| 435 SetDSerror("DirectSound SetCooperativeLevel", result); | |
| 436 #endif | |
| 437 return(-1); | |
| 438 } | |
| 439 | |
| 440 /* Try to create the primary buffer */ | |
| 441 memset(&format, 0, sizeof(format)); | |
| 442 format.dwSize = sizeof(format); | |
| 443 format.dwFlags=(DSBCAPS_PRIMARYBUFFER|DSBCAPS_GETCURRENTPOSITION2); | |
|
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444 format.dwFlags |= DSBCAPS_STICKYFOCUS; |
| 0 | 445 #ifdef USE_POSITION_NOTIFY |
| 446 format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY; | |
| 447 #endif | |
| 448 result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL); | |
| 449 if ( result != DS_OK ) { | |
| 450 #ifdef DEBUG_SOUND | |
| 451 SetDSerror("DirectSound CreateSoundBuffer", result); | |
| 452 #endif | |
| 453 return(-1); | |
| 454 } | |
| 455 | |
| 456 /* Check the size of the fragment buffer */ | |
| 457 memset(&caps, 0, sizeof(caps)); | |
| 458 caps.dwSize = sizeof(caps); | |
| 459 result = IDirectSoundBuffer_GetCaps(*sndbuf, &caps); | |
| 460 if ( result != DS_OK ) { | |
| 461 #ifdef DEBUG_SOUND | |
| 462 SetDSerror("DirectSound GetCaps", result); | |
| 463 #endif | |
| 464 IDirectSoundBuffer_Release(*sndbuf); | |
| 465 return(-1); | |
| 466 } | |
| 467 if ( (chunksize > caps.dwBufferBytes) || | |
| 468 ((caps.dwBufferBytes%chunksize) != 0) ) { | |
| 469 /* The primary buffer size is not a multiple of 'chunksize' | |
| 470 -- this hopefully doesn't happen when 'chunksize' is a | |
| 471 power of 2. | |
| 472 */ | |
| 473 IDirectSoundBuffer_Release(*sndbuf); | |
| 474 SDL_SetError( | |
| 475 "Primary buffer size is: %d, cannot break it into chunks of %d bytes\n", | |
| 476 caps.dwBufferBytes, chunksize); | |
| 477 return(-1); | |
| 478 } | |
| 479 numchunks = (caps.dwBufferBytes/chunksize); | |
| 480 | |
| 481 /* Set the primary audio format */ | |
| 482 result = IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt); | |
| 483 if ( result != DS_OK ) { | |
| 484 #ifdef DEBUG_SOUND | |
| 485 SetDSerror("DirectSound SetFormat", result); | |
| 486 #endif | |
| 487 IDirectSoundBuffer_Release(*sndbuf); | |
| 488 return(-1); | |
| 489 } | |
| 490 return(numchunks); | |
| 491 } | |
| 492 | |
| 493 /* This function tries to create a secondary audio buffer, and returns the | |
| 494 number of audio chunks available in the created buffer. | |
| 495 */ | |
| 496 static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus, | |
| 497 LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize) | |
| 498 { | |
|
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499 const int numchunks = 2; |
| 0 | 500 HRESULT result; |
| 501 DSBUFFERDESC format; | |
|
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502 LPVOID pvAudioPtr1, pvAudioPtr2; |
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diff
changeset
|
503 DWORD dwAudioBytes1, dwAudioBytes2; |
| 0 | 504 |
| 505 /* Try to set primary mixing privileges */ | |
| 506 if ( focus ) { | |
| 507 result = IDirectSound_SetCooperativeLevel(sndObj, | |
| 508 focus, DSSCL_PRIORITY); | |
| 509 } else { | |
| 510 result = IDirectSound_SetCooperativeLevel(sndObj, | |
| 511 GetDesktopWindow(), DSSCL_NORMAL); | |
| 512 } | |
| 513 if ( result != DS_OK ) { | |
| 514 #ifdef DEBUG_SOUND | |
| 515 SetDSerror("DirectSound SetCooperativeLevel", result); | |
| 516 #endif | |
| 517 return(-1); | |
| 518 } | |
| 519 | |
| 520 /* Try to create the secondary buffer */ | |
| 521 memset(&format, 0, sizeof(format)); | |
| 522 format.dwSize = sizeof(format); | |
| 523 format.dwFlags = DSBCAPS_GETCURRENTPOSITION2; | |
| 524 #ifdef USE_POSITION_NOTIFY | |
| 525 format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY; | |
| 526 #endif | |
| 527 if ( ! focus ) { | |
| 528 format.dwFlags |= DSBCAPS_GLOBALFOCUS; | |
|
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parents:
118
diff
changeset
|
529 } else { |
|
add626b825bb
Use the sticky focus flag so audio isn't muted when application is switched.
Sam Lantinga <slouken@libsdl.org>
parents:
118
diff
changeset
|
530 format.dwFlags |= DSBCAPS_STICKYFOCUS; |
| 0 | 531 } |
| 532 format.dwBufferBytes = numchunks*chunksize; | |
| 533 if ( (format.dwBufferBytes < DSBSIZE_MIN) || | |
| 534 (format.dwBufferBytes > DSBSIZE_MAX) ) { | |
| 535 SDL_SetError("Sound buffer size must be between %d and %d", | |
| 536 DSBSIZE_MIN/numchunks, DSBSIZE_MAX/numchunks); | |
| 537 return(-1); | |
| 538 } | |
| 539 format.dwReserved = 0; | |
| 540 format.lpwfxFormat = wavefmt; | |
| 541 result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL); | |
| 542 if ( result != DS_OK ) { | |
| 543 SetDSerror("DirectSound CreateSoundBuffer", result); | |
| 544 return(-1); | |
| 545 } | |
| 546 IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt); | |
| 547 | |
|
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parents:
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diff
changeset
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548 /* Silence the initial audio buffer */ |
|
7c47e511459d
Fix noise when starting audio under DX5 (thanks Jesse!)
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
549 result = IDirectSoundBuffer_Lock(*sndbuf, 0, format.dwBufferBytes, |
|
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Fix noise when starting audio under DX5 (thanks Jesse!)
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parents:
0
diff
changeset
|
550 (LPVOID *)&pvAudioPtr1, &dwAudioBytes1, |
|
7c47e511459d
Fix noise when starting audio under DX5 (thanks Jesse!)
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parents:
0
diff
changeset
|
551 (LPVOID *)&pvAudioPtr2, &dwAudioBytes2, |
|
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Fix noise when starting audio under DX5 (thanks Jesse!)
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parents:
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diff
changeset
|
552 DSBLOCK_ENTIREBUFFER); |
|
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553 if ( result == DS_OK ) { |
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554 if ( wavefmt->wBitsPerSample == 8 ) { |
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555 memset(pvAudioPtr1, 0x80, dwAudioBytes1); |
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556 } else { |
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557 memset(pvAudioPtr1, 0x00, dwAudioBytes1); |
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558 } |
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559 IDirectSoundBuffer_Unlock(*sndbuf, |
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560 (LPVOID)pvAudioPtr1, dwAudioBytes1, |
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561 (LPVOID)pvAudioPtr2, dwAudioBytes2); |
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562 } |
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563 |
| 0 | 564 /* We're ready to go */ |
| 565 return(numchunks); | |
| 566 } | |
| 567 | |
| 568 /* This function tries to set position notify events on the mixing buffer */ | |
| 569 #ifdef USE_POSITION_NOTIFY | |
| 570 static int CreateAudioEvent(_THIS) | |
| 571 { | |
| 572 LPDIRECTSOUNDNOTIFY notify; | |
| 573 DSBPOSITIONNOTIFY *notify_positions; | |
| 574 int i, retval; | |
| 575 HRESULT result; | |
| 576 | |
| 577 /* Default to fail on exit */ | |
| 578 retval = -1; | |
| 579 notify = NULL; | |
| 580 | |
| 581 /* Query for the interface */ | |
| 582 result = IDirectSoundBuffer_QueryInterface(mixbuf, | |
| 583 &IID_IDirectSoundNotify, (void *)¬ify); | |
| 584 if ( result != DS_OK ) { | |
| 585 goto done; | |
| 586 } | |
| 587 | |
| 588 /* Allocate the notify structures */ | |
| 589 notify_positions = (DSBPOSITIONNOTIFY *)malloc(NUM_BUFFERS* | |
| 590 sizeof(*notify_positions)); | |
| 591 if ( notify_positions == NULL ) { | |
| 592 goto done; | |
| 593 } | |
| 594 | |
| 595 /* Create the notify event */ | |
| 596 audio_event = CreateEvent(NULL, FALSE, FALSE, NULL); | |
| 597 if ( audio_event == NULL ) { | |
| 598 goto done; | |
| 599 } | |
| 600 | |
| 601 /* Set up the notify structures */ | |
| 602 for ( i=0; i<NUM_BUFFERS; ++i ) { | |
| 603 notify_positions[i].dwOffset = i*mixlen; | |
| 604 notify_positions[i].hEventNotify = audio_event; | |
| 605 } | |
| 606 result = IDirectSoundNotify_SetNotificationPositions(notify, | |
| 607 NUM_BUFFERS, notify_positions); | |
| 608 if ( result == DS_OK ) { | |
| 609 retval = 0; | |
| 610 } | |
| 611 done: | |
| 612 if ( notify != NULL ) { | |
| 613 IDirectSoundNotify_Release(notify); | |
| 614 } | |
| 615 return(retval); | |
| 616 } | |
| 617 #endif /* USE_POSITION_NOTIFY */ | |
| 618 | |
| 619 static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 620 { | |
| 621 HRESULT result; | |
| 622 WAVEFORMATEX waveformat; | |
| 623 | |
| 624 /* Set basic WAVE format parameters */ | |
| 625 memset(&waveformat, 0, sizeof(waveformat)); | |
| 626 waveformat.wFormatTag = WAVE_FORMAT_PCM; | |
| 627 | |
| 628 /* Determine the audio parameters from the AudioSpec */ | |
| 629 switch ( spec->format & 0xFF ) { | |
| 630 case 8: | |
| 631 /* Unsigned 8 bit audio data */ | |
| 632 spec->format = AUDIO_U8; | |
| 633 silence = 0x80; | |
| 634 waveformat.wBitsPerSample = 8; | |
| 635 break; | |
| 636 case 16: | |
| 637 /* Signed 16 bit audio data */ | |
| 638 spec->format = AUDIO_S16; | |
| 639 silence = 0x00; | |
| 640 waveformat.wBitsPerSample = 16; | |
| 641 break; | |
| 642 default: | |
| 643 SDL_SetError("Unsupported audio format"); | |
| 644 return(-1); | |
| 645 } | |
| 646 waveformat.nChannels = spec->channels; | |
| 647 waveformat.nSamplesPerSec = spec->freq; | |
| 648 waveformat.nBlockAlign = | |
| 649 waveformat.nChannels * (waveformat.wBitsPerSample/8); | |
| 650 waveformat.nAvgBytesPerSec = | |
| 651 waveformat.nSamplesPerSec * waveformat.nBlockAlign; | |
| 652 | |
| 653 /* Update the fragment size as size in bytes */ | |
| 654 SDL_CalculateAudioSpec(spec); | |
| 655 | |
| 656 /* Open the audio device */ | |
| 657 result = DSoundCreate(NULL, &sound, NULL); | |
| 658 if ( result != DS_OK ) { | |
| 659 SetDSerror("DirectSoundCreate", result); | |
| 660 return(-1); | |
| 661 } | |
| 662 | |
| 663 /* Create the audio buffer to which we write */ | |
| 664 NUM_BUFFERS = -1; | |
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665 #ifdef USE_PRIMARY_BUFFER |
| 0 | 666 if ( mainwin ) { |
| 667 NUM_BUFFERS = CreatePrimary(sound, mainwin, &mixbuf, | |
| 668 &waveformat, spec->size); | |
| 669 } | |
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670 #endif /* USE_PRIMARY_BUFFER */ |
| 0 | 671 if ( NUM_BUFFERS < 0 ) { |
| 672 NUM_BUFFERS = CreateSecondary(sound, mainwin, &mixbuf, | |
| 673 &waveformat, spec->size); | |
| 674 if ( NUM_BUFFERS < 0 ) { | |
| 675 return(-1); | |
| 676 } | |
| 677 #ifdef DEBUG_SOUND | |
| 678 fprintf(stderr, "Using secondary audio buffer\n"); | |
| 679 #endif | |
| 680 } | |
| 681 #ifdef DEBUG_SOUND | |
| 682 else | |
| 683 fprintf(stderr, "Using primary audio buffer\n"); | |
| 684 #endif | |
| 685 | |
| 686 /* The buffer will auto-start playing in DX5_WaitAudio() */ | |
| 687 playing = 0; | |
| 688 mixlen = spec->size; | |
| 689 | |
| 690 #ifdef USE_POSITION_NOTIFY | |
| 691 /* See if we can use DirectX 6 event notification */ | |
| 692 if ( CreateAudioEvent(this) == 0 ) { | |
| 693 this->WaitAudio = DX6_WaitAudio_EventWait; | |
| 694 } else { | |
| 695 this->WaitAudio = DX5_WaitAudio_BusyWait; | |
| 696 } | |
| 697 #endif | |
| 698 return(0); | |
| 699 } | |
| 700 |