Mercurial > sdl-ios-xcode
annotate src/audio/windx5/SDL_dx5audio.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 06 Feb 2006 08:28:51 +0000 |
| parents | c9b51268668f |
| children | 3692456e7b0f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
|
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15 You should have received a copy of the GNU Lesser General Public |
|
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16 License along with this library; if not, write to the Free Software |
|
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* Allow access to a raw mixing buffer */ | |
| 24 | |
| 25 #include "SDL_types.h" | |
| 26 #include "SDL_error.h" | |
| 27 #include "SDL_timer.h" | |
| 28 #include "SDL_audio.h" | |
|
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29 #include "SDL_stdlib.h" |
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It's now possible to build SDL without any C runtime at all on Windows,
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30 #include "SDL_string.h" |
| 0 | 31 #include "SDL_audio_c.h" |
| 32 #include "SDL_dx5audio.h" | |
| 33 | |
| 34 /* Define this if you want to use DirectX 6 DirectSoundNotify interface */ | |
| 35 //#define USE_POSITION_NOTIFY | |
| 36 | |
| 37 /* DirectX function pointers for audio */ | |
| 38 HRESULT (WINAPI *DSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN); | |
| 39 | |
| 40 /* Audio driver functions */ | |
| 41 static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 42 static void DX5_ThreadInit(_THIS); | |
| 43 static void DX5_WaitAudio_BusyWait(_THIS); | |
| 44 #ifdef USE_POSITION_NOTIFY | |
| 45 static void DX6_WaitAudio_EventWait(_THIS); | |
| 46 #endif | |
| 47 static void DX5_PlayAudio(_THIS); | |
| 48 static Uint8 *DX5_GetAudioBuf(_THIS); | |
| 49 static void DX5_WaitDone(_THIS); | |
| 50 static void DX5_CloseAudio(_THIS); | |
| 51 | |
| 52 /* Audio driver bootstrap functions */ | |
| 53 | |
| 54 static int Audio_Available(void) | |
| 55 { | |
| 56 HINSTANCE DSoundDLL; | |
| 57 int dsound_ok; | |
| 58 | |
| 59 /* Version check DSOUND.DLL (Is DirectX okay?) */ | |
| 60 dsound_ok = 0; | |
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61 DSoundDLL = LoadLibrary(TEXT("DSOUND.DLL")); |
| 0 | 62 if ( DSoundDLL != NULL ) { |
| 63 /* We just use basic DirectSound, we're okay */ | |
| 64 /* Yay! */ | |
| 65 /* Unfortunately, the sound drivers on NT have | |
| 66 higher latencies than the audio buffers used | |
| 67 by many SDL applications, so there are gaps | |
| 68 in the audio - it sounds terrible. Punt for now. | |
| 69 */ | |
| 70 OSVERSIONINFO ver; | |
| 71 ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO); | |
| 72 GetVersionEx(&ver); | |
| 73 switch (ver.dwPlatformId) { | |
| 74 case VER_PLATFORM_WIN32_NT: | |
| 75 if ( ver.dwMajorVersion > 4 ) { | |
| 76 /* Win2K */ | |
| 77 dsound_ok = 1; | |
| 78 } else { | |
| 79 /* WinNT */ | |
| 80 dsound_ok = 0; | |
| 81 } | |
| 82 break; | |
| 83 default: | |
| 84 /* Win95 or Win98 */ | |
| 85 dsound_ok = 1; | |
| 86 break; | |
| 87 } | |
| 88 /* Now check for DirectX 5 or better - otherwise | |
| 89 * we will fail later in DX5_OpenAudio without a chance | |
| 90 * to fall back to the DIB driver. */ | |
| 91 if (dsound_ok) { | |
| 92 /* DirectSoundCaptureCreate was added in DX5 */ | |
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93 if (!GetProcAddress(DSoundDLL, TEXT("DirectSoundCaptureCreate"))) |
| 0 | 94 dsound_ok = 0; |
| 95 | |
| 96 } | |
| 97 /* Clean up.. */ | |
| 98 FreeLibrary(DSoundDLL); | |
| 99 } | |
| 100 return(dsound_ok); | |
| 101 } | |
| 102 | |
| 103 /* Functions for loading the DirectX functions dynamically */ | |
| 104 static HINSTANCE DSoundDLL = NULL; | |
| 105 | |
| 106 static void DX5_Unload(void) | |
| 107 { | |
| 108 if ( DSoundDLL != NULL ) { | |
| 109 FreeLibrary(DSoundDLL); | |
| 110 DSoundCreate = NULL; | |
| 111 DSoundDLL = NULL; | |
| 112 } | |
| 113 } | |
| 114 static int DX5_Load(void) | |
| 115 { | |
| 116 int status; | |
| 117 | |
| 118 DX5_Unload(); | |
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119 DSoundDLL = LoadLibrary(TEXT("DSOUND.DLL")); |
| 0 | 120 if ( DSoundDLL != NULL ) { |
| 121 DSoundCreate = (void *)GetProcAddress(DSoundDLL, | |
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122 TEXT("DirectSoundCreate")); |
| 0 | 123 } |
| 124 if ( DSoundDLL && DSoundCreate ) { | |
| 125 status = 0; | |
| 126 } else { | |
| 127 DX5_Unload(); | |
| 128 status = -1; | |
| 129 } | |
| 130 return status; | |
| 131 } | |
| 132 | |
| 133 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 134 { | |
| 135 DX5_Unload(); | |
| 136 free(device->hidden); | |
| 137 free(device); | |
| 138 } | |
| 139 | |
| 140 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 141 { | |
| 142 SDL_AudioDevice *this; | |
| 143 | |
| 144 /* Load DirectX */ | |
| 145 if ( DX5_Load() < 0 ) { | |
| 146 return(NULL); | |
| 147 } | |
| 148 | |
| 149 /* Initialize all variables that we clean on shutdown */ | |
| 150 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 151 if ( this ) { | |
| 152 memset(this, 0, (sizeof *this)); | |
| 153 this->hidden = (struct SDL_PrivateAudioData *) | |
| 154 malloc((sizeof *this->hidden)); | |
| 155 } | |
| 156 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 157 SDL_OutOfMemory(); | |
| 158 if ( this ) { | |
| 159 free(this); | |
| 160 } | |
| 161 return(0); | |
| 162 } | |
| 163 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 164 | |
| 165 /* Set the function pointers */ | |
| 166 this->OpenAudio = DX5_OpenAudio; | |
| 167 this->ThreadInit = DX5_ThreadInit; | |
| 168 this->WaitAudio = DX5_WaitAudio_BusyWait; | |
| 169 this->PlayAudio = DX5_PlayAudio; | |
| 170 this->GetAudioBuf = DX5_GetAudioBuf; | |
| 171 this->WaitDone = DX5_WaitDone; | |
| 172 this->CloseAudio = DX5_CloseAudio; | |
| 173 | |
| 174 this->free = Audio_DeleteDevice; | |
| 175 | |
| 176 return this; | |
| 177 } | |
| 178 | |
| 179 AudioBootStrap DSOUND_bootstrap = { | |
| 180 "dsound", "Win95/98/2000 DirectSound", | |
| 181 Audio_Available, Audio_CreateDevice | |
| 182 }; | |
| 183 | |
| 184 static void SetDSerror(const char *function, int code) | |
| 185 { | |
| 186 static const char *error; | |
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187 static char errbuf[1024]; |
| 0 | 188 |
| 189 errbuf[0] = 0; | |
| 190 switch (code) { | |
| 191 case E_NOINTERFACE: | |
| 192 error = | |
| 193 "Unsupported interface\n-- Is DirectX 5.0 or later installed?"; | |
| 194 break; | |
| 195 case DSERR_ALLOCATED: | |
| 196 error = "Audio device in use"; | |
| 197 break; | |
| 198 case DSERR_BADFORMAT: | |
| 199 error = "Unsupported audio format"; | |
| 200 break; | |
| 201 case DSERR_BUFFERLOST: | |
| 202 error = "Mixing buffer was lost"; | |
| 203 break; | |
| 204 case DSERR_CONTROLUNAVAIL: | |
| 205 error = "Control requested is not available"; | |
| 206 break; | |
| 207 case DSERR_INVALIDCALL: | |
| 208 error = "Invalid call for the current state"; | |
| 209 break; | |
| 210 case DSERR_INVALIDPARAM: | |
| 211 error = "Invalid parameter"; | |
| 212 break; | |
| 213 case DSERR_NODRIVER: | |
| 214 error = "No audio device found"; | |
| 215 break; | |
| 216 case DSERR_OUTOFMEMORY: | |
| 217 error = "Out of memory"; | |
| 218 break; | |
| 219 case DSERR_PRIOLEVELNEEDED: | |
| 220 error = "Caller doesn't have priority"; | |
| 221 break; | |
| 222 case DSERR_UNSUPPORTED: | |
| 223 error = "Function not supported"; | |
| 224 break; | |
| 225 default: | |
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It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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226 snprintf(errbuf, SDL_arraysize(errbuf), |
|
450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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227 "%s: Unknown DirectSound error: 0x%x", |
| 0 | 228 function, code); |
| 229 break; | |
| 230 } | |
| 231 if ( ! errbuf[0] ) { | |
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parents:
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diff
changeset
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232 snprintf(errbuf, SDL_arraysize(errbuf), "%s: %s", function, error); |
| 0 | 233 } |
| 234 SDL_SetError("%s", errbuf); | |
| 235 return; | |
| 236 } | |
| 237 | |
| 238 /* DirectSound needs to be associated with a window */ | |
| 239 static HWND mainwin = NULL; | |
| 240 /* */ | |
| 241 void DX5_SoundFocus(HWND hwnd) | |
| 242 { | |
| 243 mainwin = hwnd; | |
| 244 } | |
| 245 | |
| 246 static void DX5_ThreadInit(_THIS) | |
| 247 { | |
| 248 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST); | |
| 249 } | |
| 250 | |
| 251 static void DX5_WaitAudio_BusyWait(_THIS) | |
| 252 { | |
| 253 DWORD status; | |
| 254 DWORD cursor, junk; | |
| 255 HRESULT result; | |
| 256 | |
| 257 /* Semi-busy wait, since we have no way of getting play notification | |
| 258 on a primary mixing buffer located in hardware (DirectX 5.0) | |
| 259 */ | |
| 260 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &cursor, &junk); | |
| 261 if ( result != DS_OK ) { | |
| 262 if ( result == DSERR_BUFFERLOST ) { | |
| 263 IDirectSoundBuffer_Restore(mixbuf); | |
| 264 } | |
| 265 #ifdef DEBUG_SOUND | |
| 266 SetDSerror("DirectSound GetCurrentPosition", result); | |
| 267 #endif | |
| 268 return; | |
| 269 } | |
| 270 cursor /= mixlen; | |
| 271 | |
| 272 while ( cursor == playing ) { | |
| 273 /* FIXME: find out how much time is left and sleep that long */ | |
| 274 SDL_Delay(10); | |
| 275 | |
| 276 /* Try to restore a lost sound buffer */ | |
| 277 IDirectSoundBuffer_GetStatus(mixbuf, &status); | |
| 278 if ( (status&DSBSTATUS_BUFFERLOST) ) { | |
| 279 IDirectSoundBuffer_Restore(mixbuf); | |
| 280 IDirectSoundBuffer_GetStatus(mixbuf, &status); | |
| 281 if ( (status&DSBSTATUS_BUFFERLOST) ) { | |
| 282 break; | |
| 283 } | |
| 284 } | |
| 285 if ( ! (status&DSBSTATUS_PLAYING) ) { | |
| 286 result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING); | |
| 287 if ( result == DS_OK ) { | |
| 288 continue; | |
| 289 } | |
| 290 #ifdef DEBUG_SOUND | |
| 291 SetDSerror("DirectSound Play", result); | |
| 292 #endif | |
| 293 return; | |
| 294 } | |
| 295 | |
| 296 /* Find out where we are playing */ | |
| 297 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, | |
| 298 &cursor, &junk); | |
| 299 if ( result != DS_OK ) { | |
| 300 SetDSerror("DirectSound GetCurrentPosition", result); | |
| 301 return; | |
| 302 } | |
| 303 cursor /= mixlen; | |
| 304 } | |
| 305 } | |
| 306 | |
| 307 #ifdef USE_POSITION_NOTIFY | |
| 308 static void DX6_WaitAudio_EventWait(_THIS) | |
| 309 { | |
| 310 DWORD status; | |
| 311 HRESULT result; | |
| 312 | |
| 313 /* Try to restore a lost sound buffer */ | |
| 314 IDirectSoundBuffer_GetStatus(mixbuf, &status); | |
| 315 if ( (status&DSBSTATUS_BUFFERLOST) ) { | |
| 316 IDirectSoundBuffer_Restore(mixbuf); | |
| 317 IDirectSoundBuffer_GetStatus(mixbuf, &status); | |
| 318 if ( (status&DSBSTATUS_BUFFERLOST) ) { | |
| 319 return; | |
| 320 } | |
| 321 } | |
| 322 if ( ! (status&DSBSTATUS_PLAYING) ) { | |
| 323 result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING); | |
| 324 if ( result != DS_OK ) { | |
| 325 #ifdef DEBUG_SOUND | |
| 326 SetDSerror("DirectSound Play", result); | |
| 327 #endif | |
| 328 return; | |
| 329 } | |
| 330 } | |
| 331 WaitForSingleObject(audio_event, INFINITE); | |
| 332 } | |
| 333 #endif /* USE_POSITION_NOTIFY */ | |
| 334 | |
| 335 static void DX5_PlayAudio(_THIS) | |
| 336 { | |
| 337 /* Unlock the buffer, allowing it to play */ | |
| 338 if ( locked_buf ) { | |
| 339 IDirectSoundBuffer_Unlock(mixbuf, locked_buf, mixlen, NULL, 0); | |
| 340 } | |
| 341 | |
| 342 } | |
| 343 | |
| 344 static Uint8 *DX5_GetAudioBuf(_THIS) | |
| 345 { | |
| 346 DWORD cursor, junk; | |
| 347 HRESULT result; | |
| 348 DWORD rawlen; | |
| 349 | |
| 350 /* Figure out which blocks to fill next */ | |
| 351 locked_buf = NULL; | |
| 352 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &cursor, &junk); | |
| 353 if ( result == DSERR_BUFFERLOST ) { | |
| 354 IDirectSoundBuffer_Restore(mixbuf); | |
| 355 result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, | |
| 356 &cursor, &junk); | |
| 357 } | |
| 358 if ( result != DS_OK ) { | |
| 359 SetDSerror("DirectSound GetCurrentPosition", result); | |
| 360 return(NULL); | |
| 361 } | |
| 362 cursor /= mixlen; | |
| 363 playing = cursor; | |
| 364 cursor = (cursor+1)%NUM_BUFFERS; | |
| 365 cursor *= mixlen; | |
| 366 | |
| 367 /* Lock the audio buffer */ | |
| 368 result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen, | |
| 369 (LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0); | |
| 370 if ( result == DSERR_BUFFERLOST ) { | |
| 371 IDirectSoundBuffer_Restore(mixbuf); | |
| 372 result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen, | |
| 373 (LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0); | |
| 374 } | |
| 375 if ( result != DS_OK ) { | |
| 376 SetDSerror("DirectSound Lock", result); | |
| 377 return(NULL); | |
| 378 } | |
| 379 return(locked_buf); | |
| 380 } | |
| 381 | |
| 382 static void DX5_WaitDone(_THIS) | |
| 383 { | |
| 384 Uint8 *stream; | |
| 385 | |
| 386 /* Wait for the playing chunk to finish */ | |
| 387 stream = this->GetAudioBuf(this); | |
| 388 if ( stream != NULL ) { | |
| 389 memset(stream, silence, mixlen); | |
| 390 this->PlayAudio(this); | |
| 391 } | |
| 392 this->WaitAudio(this); | |
| 393 | |
| 394 /* Stop the looping sound buffer */ | |
| 395 IDirectSoundBuffer_Stop(mixbuf); | |
| 396 } | |
| 397 | |
| 398 static void DX5_CloseAudio(_THIS) | |
| 399 { | |
| 400 if ( sound != NULL ) { | |
| 401 if ( mixbuf != NULL ) { | |
| 402 /* Clean up the audio buffer */ | |
| 403 IDirectSoundBuffer_Release(mixbuf); | |
| 404 mixbuf = NULL; | |
| 405 } | |
| 406 if ( audio_event != NULL ) { | |
| 407 CloseHandle(audio_event); | |
| 408 audio_event = NULL; | |
| 409 } | |
| 410 IDirectSound_Release(sound); | |
| 411 sound = NULL; | |
| 412 } | |
| 413 } | |
| 414 | |
| 469 | 415 #ifdef USE_PRIMARY_BUFFER |
| 0 | 416 /* This function tries to create a primary audio buffer, and returns the |
| 417 number of audio chunks available in the created buffer. | |
| 418 */ | |
| 419 static int CreatePrimary(LPDIRECTSOUND sndObj, HWND focus, | |
| 420 LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize) | |
| 421 { | |
| 422 HRESULT result; | |
| 423 DSBUFFERDESC format; | |
| 424 DSBCAPS caps; | |
| 425 int numchunks; | |
| 426 | |
| 427 /* Try to set primary mixing privileges */ | |
| 428 result = IDirectSound_SetCooperativeLevel(sndObj, focus, | |
| 429 DSSCL_WRITEPRIMARY); | |
| 430 if ( result != DS_OK ) { | |
| 431 #ifdef DEBUG_SOUND | |
| 432 SetDSerror("DirectSound SetCooperativeLevel", result); | |
| 433 #endif | |
| 434 return(-1); | |
| 435 } | |
| 436 | |
| 437 /* Try to create the primary buffer */ | |
| 438 memset(&format, 0, sizeof(format)); | |
| 439 format.dwSize = sizeof(format); | |
| 440 format.dwFlags=(DSBCAPS_PRIMARYBUFFER|DSBCAPS_GETCURRENTPOSITION2); | |
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441 format.dwFlags |= DSBCAPS_STICKYFOCUS; |
| 0 | 442 #ifdef USE_POSITION_NOTIFY |
| 443 format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY; | |
| 444 #endif | |
| 445 result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL); | |
| 446 if ( result != DS_OK ) { | |
| 447 #ifdef DEBUG_SOUND | |
| 448 SetDSerror("DirectSound CreateSoundBuffer", result); | |
| 449 #endif | |
| 450 return(-1); | |
| 451 } | |
| 452 | |
| 453 /* Check the size of the fragment buffer */ | |
| 454 memset(&caps, 0, sizeof(caps)); | |
| 455 caps.dwSize = sizeof(caps); | |
| 456 result = IDirectSoundBuffer_GetCaps(*sndbuf, &caps); | |
| 457 if ( result != DS_OK ) { | |
| 458 #ifdef DEBUG_SOUND | |
| 459 SetDSerror("DirectSound GetCaps", result); | |
| 460 #endif | |
| 461 IDirectSoundBuffer_Release(*sndbuf); | |
| 462 return(-1); | |
| 463 } | |
| 464 if ( (chunksize > caps.dwBufferBytes) || | |
| 465 ((caps.dwBufferBytes%chunksize) != 0) ) { | |
| 466 /* The primary buffer size is not a multiple of 'chunksize' | |
| 467 -- this hopefully doesn't happen when 'chunksize' is a | |
| 468 power of 2. | |
| 469 */ | |
| 470 IDirectSoundBuffer_Release(*sndbuf); | |
| 471 SDL_SetError( | |
| 472 "Primary buffer size is: %d, cannot break it into chunks of %d bytes\n", | |
| 473 caps.dwBufferBytes, chunksize); | |
| 474 return(-1); | |
| 475 } | |
| 476 numchunks = (caps.dwBufferBytes/chunksize); | |
| 477 | |
| 478 /* Set the primary audio format */ | |
| 479 result = IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt); | |
| 480 if ( result != DS_OK ) { | |
| 481 #ifdef DEBUG_SOUND | |
| 482 SetDSerror("DirectSound SetFormat", result); | |
| 483 #endif | |
| 484 IDirectSoundBuffer_Release(*sndbuf); | |
| 485 return(-1); | |
| 486 } | |
| 487 return(numchunks); | |
| 488 } | |
| 469 | 489 #endif /* USE_PRIMARY_BUFFER */ |
| 0 | 490 |
| 491 /* This function tries to create a secondary audio buffer, and returns the | |
| 492 number of audio chunks available in the created buffer. | |
| 493 */ | |
| 494 static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus, | |
| 495 LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize) | |
| 496 { | |
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497 const int numchunks = 2; |
| 0 | 498 HRESULT result; |
| 499 DSBUFFERDESC format; | |
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500 LPVOID pvAudioPtr1, pvAudioPtr2; |
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501 DWORD dwAudioBytes1, dwAudioBytes2; |
| 0 | 502 |
| 503 /* Try to set primary mixing privileges */ | |
| 504 if ( focus ) { | |
| 505 result = IDirectSound_SetCooperativeLevel(sndObj, | |
| 506 focus, DSSCL_PRIORITY); | |
| 507 } else { | |
| 508 result = IDirectSound_SetCooperativeLevel(sndObj, | |
| 509 GetDesktopWindow(), DSSCL_NORMAL); | |
| 510 } | |
| 511 if ( result != DS_OK ) { | |
| 512 #ifdef DEBUG_SOUND | |
| 513 SetDSerror("DirectSound SetCooperativeLevel", result); | |
| 514 #endif | |
| 515 return(-1); | |
| 516 } | |
| 517 | |
| 518 /* Try to create the secondary buffer */ | |
| 519 memset(&format, 0, sizeof(format)); | |
| 520 format.dwSize = sizeof(format); | |
| 521 format.dwFlags = DSBCAPS_GETCURRENTPOSITION2; | |
| 522 #ifdef USE_POSITION_NOTIFY | |
| 523 format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY; | |
| 524 #endif | |
| 525 if ( ! focus ) { | |
| 526 format.dwFlags |= DSBCAPS_GLOBALFOCUS; | |
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527 } else { |
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528 format.dwFlags |= DSBCAPS_STICKYFOCUS; |
| 0 | 529 } |
| 530 format.dwBufferBytes = numchunks*chunksize; | |
| 531 if ( (format.dwBufferBytes < DSBSIZE_MIN) || | |
| 532 (format.dwBufferBytes > DSBSIZE_MAX) ) { | |
| 533 SDL_SetError("Sound buffer size must be between %d and %d", | |
| 534 DSBSIZE_MIN/numchunks, DSBSIZE_MAX/numchunks); | |
| 535 return(-1); | |
| 536 } | |
| 537 format.dwReserved = 0; | |
| 538 format.lpwfxFormat = wavefmt; | |
| 539 result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL); | |
| 540 if ( result != DS_OK ) { | |
| 541 SetDSerror("DirectSound CreateSoundBuffer", result); | |
| 542 return(-1); | |
| 543 } | |
| 544 IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt); | |
| 545 | |
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546 /* Silence the initial audio buffer */ |
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547 result = IDirectSoundBuffer_Lock(*sndbuf, 0, format.dwBufferBytes, |
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548 (LPVOID *)&pvAudioPtr1, &dwAudioBytes1, |
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549 (LPVOID *)&pvAudioPtr2, &dwAudioBytes2, |
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550 DSBLOCK_ENTIREBUFFER); |
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551 if ( result == DS_OK ) { |
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552 if ( wavefmt->wBitsPerSample == 8 ) { |
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553 memset(pvAudioPtr1, 0x80, dwAudioBytes1); |
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554 } else { |
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555 memset(pvAudioPtr1, 0x00, dwAudioBytes1); |
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556 } |
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557 IDirectSoundBuffer_Unlock(*sndbuf, |
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558 (LPVOID)pvAudioPtr1, dwAudioBytes1, |
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559 (LPVOID)pvAudioPtr2, dwAudioBytes2); |
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560 } |
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561 |
| 0 | 562 /* We're ready to go */ |
| 563 return(numchunks); | |
| 564 } | |
| 565 | |
| 566 /* This function tries to set position notify events on the mixing buffer */ | |
| 567 #ifdef USE_POSITION_NOTIFY | |
| 568 static int CreateAudioEvent(_THIS) | |
| 569 { | |
| 570 LPDIRECTSOUNDNOTIFY notify; | |
| 571 DSBPOSITIONNOTIFY *notify_positions; | |
| 572 int i, retval; | |
| 573 HRESULT result; | |
| 574 | |
| 575 /* Default to fail on exit */ | |
| 576 retval = -1; | |
| 577 notify = NULL; | |
| 578 | |
| 579 /* Query for the interface */ | |
| 580 result = IDirectSoundBuffer_QueryInterface(mixbuf, | |
| 581 &IID_IDirectSoundNotify, (void *)¬ify); | |
| 582 if ( result != DS_OK ) { | |
| 583 goto done; | |
| 584 } | |
| 585 | |
| 586 /* Allocate the notify structures */ | |
| 587 notify_positions = (DSBPOSITIONNOTIFY *)malloc(NUM_BUFFERS* | |
| 588 sizeof(*notify_positions)); | |
| 589 if ( notify_positions == NULL ) { | |
| 590 goto done; | |
| 591 } | |
| 592 | |
| 593 /* Create the notify event */ | |
| 594 audio_event = CreateEvent(NULL, FALSE, FALSE, NULL); | |
| 595 if ( audio_event == NULL ) { | |
| 596 goto done; | |
| 597 } | |
| 598 | |
| 599 /* Set up the notify structures */ | |
| 600 for ( i=0; i<NUM_BUFFERS; ++i ) { | |
| 601 notify_positions[i].dwOffset = i*mixlen; | |
| 602 notify_positions[i].hEventNotify = audio_event; | |
| 603 } | |
| 604 result = IDirectSoundNotify_SetNotificationPositions(notify, | |
| 605 NUM_BUFFERS, notify_positions); | |
| 606 if ( result == DS_OK ) { | |
| 607 retval = 0; | |
| 608 } | |
| 609 done: | |
| 610 if ( notify != NULL ) { | |
| 611 IDirectSoundNotify_Release(notify); | |
| 612 } | |
| 613 return(retval); | |
| 614 } | |
| 615 #endif /* USE_POSITION_NOTIFY */ | |
| 616 | |
| 617 static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 618 { | |
| 619 HRESULT result; | |
| 620 WAVEFORMATEX waveformat; | |
| 621 | |
| 622 /* Set basic WAVE format parameters */ | |
| 623 memset(&waveformat, 0, sizeof(waveformat)); | |
| 624 waveformat.wFormatTag = WAVE_FORMAT_PCM; | |
| 625 | |
| 626 /* Determine the audio parameters from the AudioSpec */ | |
| 627 switch ( spec->format & 0xFF ) { | |
| 628 case 8: | |
| 629 /* Unsigned 8 bit audio data */ | |
| 630 spec->format = AUDIO_U8; | |
| 631 silence = 0x80; | |
| 632 waveformat.wBitsPerSample = 8; | |
| 633 break; | |
| 634 case 16: | |
| 635 /* Signed 16 bit audio data */ | |
| 636 spec->format = AUDIO_S16; | |
| 637 silence = 0x00; | |
| 638 waveformat.wBitsPerSample = 16; | |
| 639 break; | |
| 640 default: | |
| 641 SDL_SetError("Unsupported audio format"); | |
| 642 return(-1); | |
| 643 } | |
| 644 waveformat.nChannels = spec->channels; | |
| 645 waveformat.nSamplesPerSec = spec->freq; | |
| 646 waveformat.nBlockAlign = | |
| 647 waveformat.nChannels * (waveformat.wBitsPerSample/8); | |
| 648 waveformat.nAvgBytesPerSec = | |
| 649 waveformat.nSamplesPerSec * waveformat.nBlockAlign; | |
| 650 | |
| 651 /* Update the fragment size as size in bytes */ | |
| 652 SDL_CalculateAudioSpec(spec); | |
| 653 | |
| 654 /* Open the audio device */ | |
| 655 result = DSoundCreate(NULL, &sound, NULL); | |
| 656 if ( result != DS_OK ) { | |
| 657 SetDSerror("DirectSoundCreate", result); | |
| 658 return(-1); | |
| 659 } | |
| 660 | |
| 661 /* Create the audio buffer to which we write */ | |
| 662 NUM_BUFFERS = -1; | |
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663 #ifdef USE_PRIMARY_BUFFER |
| 0 | 664 if ( mainwin ) { |
| 665 NUM_BUFFERS = CreatePrimary(sound, mainwin, &mixbuf, | |
| 666 &waveformat, spec->size); | |
| 667 } | |
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668 #endif /* USE_PRIMARY_BUFFER */ |
| 0 | 669 if ( NUM_BUFFERS < 0 ) { |
| 670 NUM_BUFFERS = CreateSecondary(sound, mainwin, &mixbuf, | |
| 671 &waveformat, spec->size); | |
| 672 if ( NUM_BUFFERS < 0 ) { | |
| 673 return(-1); | |
| 674 } | |
| 675 #ifdef DEBUG_SOUND | |
| 676 fprintf(stderr, "Using secondary audio buffer\n"); | |
| 677 #endif | |
| 678 } | |
| 679 #ifdef DEBUG_SOUND | |
| 680 else | |
| 681 fprintf(stderr, "Using primary audio buffer\n"); | |
| 682 #endif | |
| 683 | |
| 684 /* The buffer will auto-start playing in DX5_WaitAudio() */ | |
| 685 playing = 0; | |
| 686 mixlen = spec->size; | |
| 687 | |
| 688 #ifdef USE_POSITION_NOTIFY | |
| 689 /* See if we can use DirectX 6 event notification */ | |
| 690 if ( CreateAudioEvent(this) == 0 ) { | |
| 691 this->WaitAudio = DX6_WaitAudio_EventWait; | |
| 692 } else { | |
| 693 this->WaitAudio = DX5_WaitAudio_BusyWait; | |
| 694 } | |
| 695 #endif | |
| 696 return(0); | |
| 697 } | |
| 698 |