e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 Sam Lantinga |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 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 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with this library; if not, write to the Free Software |
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
18 | |
19 | Sam Lantinga |
20 | slouken@libsdl.org |
21 | */ |
22 | #include "SDL_config.h" |
23 | |
24 | /* Allow access to a raw mixing buffer */ |
25 | |
26 | #include "SDL_timer.h" |
27 | #include "SDL_audio.h" |
28 | #include "../SDL_audio_c.h" |
29 | #include "SDL_dx5audio.h" |
30 | |
31 | /* Define this if you want to use DirectX 6 DirectSoundNotify interface */ |
32 | //#define USE_POSITION_NOTIFY |
33 | |
34 | /* DirectX function pointers for audio */ |
35 | HRESULT (WINAPI *DSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN); |
36 | |
37 | /* Audio driver functions */ |
38 | static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec); |
39 | static void DX5_ThreadInit(_THIS); |
40 | static void DX5_WaitAudio_BusyWait(_THIS); |
41 | #ifdef USE_POSITION_NOTIFY |
42 | static void DX6_WaitAudio_EventWait(_THIS); |
43 | #endif |
44 | static void DX5_PlayAudio(_THIS); |
45 | static Uint8 *DX5_GetAudioBuf(_THIS); |
46 | static void DX5_WaitDone(_THIS); |
47 | static void DX5_CloseAudio(_THIS); |
48 | |
49 | /* Audio driver bootstrap functions */ |
50 | |
51 | static int Audio_Available(void) |
52 | { |
53 | HINSTANCE DSoundDLL; |
54 | int dsound_ok; |
55 | |
56 | /* Version check DSOUND.DLL (Is DirectX okay?) */ |
57 | dsound_ok = 0; |
58 | DSoundDLL = LoadLibrary(TEXT("DSOUND.DLL")); |
59 | if ( DSoundDLL != NULL ) { |
60 | /* We just use basic DirectSound, we're okay */ |
61 | /* Yay! */ |
62 | /* Unfortunately, the sound drivers on NT have |
63 | higher latencies than the audio buffers used |
64 | by many SDL applications, so there are gaps |
65 | in the audio - it sounds terrible. Punt for now. |
66 | */ |
67 | OSVERSIONINFO ver; |
68 | ver.dwOSVersionInfoSize = sizeof (OSVERSIONINFO); |
69 | GetVersionEx(&ver); |
70 | switch (ver.dwPlatformId) { |
71 | case VER_PLATFORM_WIN32_NT: |
72 | if ( ver.dwMajorVersion > 4 ) { |
73 | /* Win2K */ |
74 | dsound_ok = 1; |
75 | } else { |
76 | /* WinNT */ |
77 | dsound_ok = 0; |
78 | } |
79 | break; |
80 | default: |
81 | /* Win95 or Win98 */ |
82 | dsound_ok = 1; |
83 | break; |
84 | } |
85 | /* Now check for DirectX 5 or better - otherwise |
86 | * we will fail later in DX5_OpenAudio without a chance |
87 | * to fall back to the DIB driver. */ |
88 | if (dsound_ok) { |
89 | /* DirectSoundCaptureCreate was added in DX5 */ |
90 | if (!GetProcAddress(DSoundDLL, TEXT("DirectSoundCaptureCreate"))) |
91 | dsound_ok = 0; |
92 | |
93 | } |
94 | /* Clean up.. */ |
95 | FreeLibrary(DSoundDLL); |
96 | } |
97 | return(dsound_ok); |
98 | } |
99 | |
100 | /* Functions for loading the DirectX functions dynamically */ |
101 | static HINSTANCE DSoundDLL = NULL; |
102 | |
103 | static void DX5_Unload(void) |
104 | { |
105 | if ( DSoundDLL != NULL ) { |
106 | FreeLibrary(DSoundDLL); |
107 | DSoundCreate = NULL; |
108 | DSoundDLL = NULL; |
109 | } |
110 | } |
111 | static int DX5_Load(void) |
112 | { |
113 | int status; |
114 | |
115 | DX5_Unload(); |
116 | DSoundDLL = LoadLibrary(TEXT("DSOUND.DLL")); |
117 | if ( DSoundDLL != NULL ) { |
118 | DSoundCreate = (void *)GetProcAddress(DSoundDLL, |
119 | TEXT("DirectSoundCreate")); |
120 | } |
121 | if ( DSoundDLL && DSoundCreate ) { |
122 | status = 0; |
123 | } else { |
124 | DX5_Unload(); |
125 | status = -1; |
126 | } |
127 | return status; |
128 | } |
129 | |
130 | static void Audio_DeleteDevice(SDL_AudioDevice *device) |
131 | { |
132 | DX5_Unload(); |
133 | SDL_free(device->hidden); |
134 | SDL_free(device); |
135 | } |
136 | |
137 | static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
138 | { |
139 | SDL_AudioDevice *this; |
140 | |
141 | /* Load DirectX */ |
142 | if ( DX5_Load() < 0 ) { |
143 | return(NULL); |
144 | } |
145 | |
146 | /* Initialize all variables that we clean on shutdown */ |
147 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
148 | if ( this ) { |
149 | SDL_memset(this, 0, (sizeof *this)); |
150 | this->hidden = (struct SDL_PrivateAudioData *) |
151 | SDL_malloc((sizeof *this->hidden)); |
152 | } |
153 | if ( (this == NULL) || (this->hidden == NULL) ) { |
154 | SDL_OutOfMemory(); |
155 | if ( this ) { |
156 | SDL_free(this); |
157 | } |
158 | return(0); |
159 | } |
160 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
161 | |
162 | /* Set the function pointers */ |
163 | this->OpenAudio = DX5_OpenAudio; |
164 | this->ThreadInit = DX5_ThreadInit; |
165 | this->WaitAudio = DX5_WaitAudio_BusyWait; |
166 | this->PlayAudio = DX5_PlayAudio; |
167 | this->GetAudioBuf = DX5_GetAudioBuf; |
168 | this->WaitDone = DX5_WaitDone; |
169 | this->CloseAudio = DX5_CloseAudio; |
170 | |
171 | this->free = Audio_DeleteDevice; |
172 | |
173 | return this; |
174 | } |
175 | |
176 | AudioBootStrap DSOUND_bootstrap = { |
177 | "dsound", "Win95/98/2000 DirectSound", |
178 | Audio_Available, Audio_CreateDevice |
179 | }; |
180 | |
181 | static void SetDSerror(const char *function, int code) |
182 | { |
183 | static const char *error; |
184 | static char errbuf[1024]; |
185 | |
186 | errbuf[0] = 0; |
187 | switch (code) { |
188 | case E_NOINTERFACE: |
189 | error = |
190 | "Unsupported interface\n-- Is DirectX 5.0 or later installed?"; |
191 | break; |
192 | case DSERR_ALLOCATED: |
193 | error = "Audio device in use"; |
194 | break; |
195 | case DSERR_BADFORMAT: |
196 | error = "Unsupported audio format"; |
197 | break; |
198 | case DSERR_BUFFERLOST: |
199 | error = "Mixing buffer was lost"; |
200 | break; |
201 | case DSERR_CONTROLUNAVAIL: |
202 | error = "Control requested is not available"; |
203 | break; |
204 | case DSERR_INVALIDCALL: |
205 | error = "Invalid call for the current state"; |
206 | break; |
207 | case DSERR_INVALIDPARAM: |
208 | error = "Invalid parameter"; |
209 | break; |
210 | case DSERR_NODRIVER: |
211 | error = "No audio device found"; |
212 | break; |
213 | case DSERR_OUTOFMEMORY: |
214 | error = "Out of memory"; |
215 | break; |
216 | case DSERR_PRIOLEVELNEEDED: |
217 | error = "Caller doesn't have priority"; |
218 | break; |
219 | case DSERR_UNSUPPORTED: |
220 | error = "Function not supported"; |
221 | break; |
222 | default: |
223 | SDL_snprintf(errbuf, SDL_arraysize(errbuf), |
224 | "%s: Unknown DirectSound error: 0x%x", |
225 | function, code); |
226 | break; |
227 | } |
228 | if ( ! errbuf[0] ) { |
229 | SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: %s", function, error); |
230 | } |
231 | SDL_SetError("%s", errbuf); |
232 | return; |
233 | } |
234 | |
235 | /* DirectSound needs to be associated with a window */ |
236 | static HWND mainwin = NULL; |
237 | /* */ |
238 | void DX5_SoundFocus(HWND hwnd) |
239 | { |
240 | mainwin = hwnd; |
241 | } |
242 | |
243 | static void DX5_ThreadInit(_THIS) |
244 | { |
245 | SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST); |
246 | } |
247 | |
248 | static void DX5_WaitAudio_BusyWait(_THIS) |
249 | { |
250 | DWORD status; |
251 | DWORD cursor, junk; |
252 | HRESULT result; |
253 | |
254 | /* Semi-busy wait, since we have no way of getting play notification |
255 | on a primary mixing buffer located in hardware (DirectX 5.0) |
256 | */ |
257 | result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &junk, &cursor); |
258 | if ( result != DS_OK ) { |
259 | if ( result == DSERR_BUFFERLOST ) { |
260 | IDirectSoundBuffer_Restore(mixbuf); |
261 | } |
262 | #ifdef DEBUG_SOUND |
263 | SetDSerror("DirectSound GetCurrentPosition", result); |
264 | #endif |
265 | return; |
266 | } |
267 | |
268 | while ( (cursor/mixlen) == lastchunk ) { |
269 | /* FIXME: find out how much time is left and sleep that long */ |
270 | SDL_Delay(1); |
271 | |
272 | /* Try to restore a lost sound buffer */ |
273 | IDirectSoundBuffer_GetStatus(mixbuf, &status); |
274 | if ( (status&DSBSTATUS_BUFFERLOST) ) { |
275 | IDirectSoundBuffer_Restore(mixbuf); |
276 | IDirectSoundBuffer_GetStatus(mixbuf, &status); |
277 | if ( (status&DSBSTATUS_BUFFERLOST) ) { |
278 | break; |
279 | } |
280 | } |
281 | if ( ! (status&DSBSTATUS_PLAYING) ) { |
282 | result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING); |
283 | if ( result == DS_OK ) { |
284 | continue; |
285 | } |
286 | #ifdef DEBUG_SOUND |
287 | SetDSerror("DirectSound Play", result); |
288 | #endif |
289 | return; |
290 | } |
291 | |
292 | /* Find out where we are playing */ |
293 | result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, |
294 | &junk, &cursor); |
295 | if ( result != DS_OK ) { |
296 | SetDSerror("DirectSound GetCurrentPosition", result); |
297 | return; |
298 | } |
299 | } |
300 | } |
301 | |
302 | #ifdef USE_POSITION_NOTIFY |
303 | static void DX6_WaitAudio_EventWait(_THIS) |
304 | { |
305 | DWORD status; |
306 | HRESULT result; |
307 | |
308 | /* Try to restore a lost sound buffer */ |
309 | IDirectSoundBuffer_GetStatus(mixbuf, &status); |
310 | if ( (status&DSBSTATUS_BUFFERLOST) ) { |
311 | IDirectSoundBuffer_Restore(mixbuf); |
312 | IDirectSoundBuffer_GetStatus(mixbuf, &status); |
313 | if ( (status&DSBSTATUS_BUFFERLOST) ) { |
314 | return; |
315 | } |
316 | } |
317 | if ( ! (status&DSBSTATUS_PLAYING) ) { |
318 | result = IDirectSoundBuffer_Play(mixbuf, 0, 0, DSBPLAY_LOOPING); |
319 | if ( result != DS_OK ) { |
320 | #ifdef DEBUG_SOUND |
321 | SetDSerror("DirectSound Play", result); |
322 | #endif |
323 | return; |
324 | } |
325 | } |
326 | WaitForSingleObject(audio_event, INFINITE); |
327 | } |
328 | #endif /* USE_POSITION_NOTIFY */ |
329 | |
330 | static void DX5_PlayAudio(_THIS) |
331 | { |
332 | /* Unlock the buffer, allowing it to play */ |
333 | if ( locked_buf ) { |
334 | IDirectSoundBuffer_Unlock(mixbuf, locked_buf, mixlen, NULL, 0); |
335 | } |
336 | |
337 | } |
338 | |
339 | static Uint8 *DX5_GetAudioBuf(_THIS) |
340 | { |
341 | DWORD cursor, junk; |
342 | HRESULT result; |
343 | DWORD rawlen; |
344 | |
345 | /* Figure out which blocks to fill next */ |
346 | locked_buf = NULL; |
347 | result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, &junk, &cursor); |
348 | if ( result == DSERR_BUFFERLOST ) { |
349 | IDirectSoundBuffer_Restore(mixbuf); |
350 | result = IDirectSoundBuffer_GetCurrentPosition(mixbuf, |
351 | &junk, &cursor); |
352 | } |
353 | if ( result != DS_OK ) { |
354 | SetDSerror("DirectSound GetCurrentPosition", result); |
355 | return(NULL); |
356 | } |
357 | cursor /= mixlen; |
358 | #ifdef DEBUG_SOUND |
359 | /* Detect audio dropouts */ |
360 | { DWORD spot = cursor; |
361 | if ( spot < lastchunk ) { |
362 | spot += NUM_BUFFERS; |
363 | } |
364 | if ( spot > lastchunk+1 ) { |
365 | fprintf(stderr, "Audio dropout, missed %d fragments\n", |
366 | (spot - (lastchunk+1))); |
367 | } |
368 | } |
369 | #endif |
370 | lastchunk = cursor; |
371 | cursor = (cursor+1)%NUM_BUFFERS; |
372 | cursor *= mixlen; |
373 | |
374 | /* Lock the audio buffer */ |
375 | result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen, |
376 | (LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0); |
377 | if ( result == DSERR_BUFFERLOST ) { |
378 | IDirectSoundBuffer_Restore(mixbuf); |
379 | result = IDirectSoundBuffer_Lock(mixbuf, cursor, mixlen, |
380 | (LPVOID *)&locked_buf, &rawlen, NULL, &junk, 0); |
381 | } |
382 | if ( result != DS_OK ) { |
383 | SetDSerror("DirectSound Lock", result); |
384 | return(NULL); |
385 | } |
386 | return(locked_buf); |
387 | } |
388 | |
389 | static void DX5_WaitDone(_THIS) |
390 | { |
391 | Uint8 *stream; |
392 | |
393 | /* Wait for the playing chunk to finish */ |
394 | stream = this->GetAudioBuf(this); |
395 | if ( stream != NULL ) { |
396 | SDL_memset(stream, silence, mixlen); |
397 | this->PlayAudio(this); |
398 | } |
399 | this->WaitAudio(this); |
400 | |
401 | /* Stop the looping sound buffer */ |
402 | IDirectSoundBuffer_Stop(mixbuf); |
403 | } |
404 | |
405 | static void DX5_CloseAudio(_THIS) |
406 | { |
407 | if ( sound != NULL ) { |
408 | if ( mixbuf != NULL ) { |
409 | /* Clean up the audio buffer */ |
410 | IDirectSoundBuffer_Release(mixbuf); |
411 | mixbuf = NULL; |
412 | } |
413 | if ( audio_event != NULL ) { |
414 | CloseHandle(audio_event); |
415 | audio_event = NULL; |
416 | } |
417 | IDirectSound_Release(sound); |
418 | sound = NULL; |
419 | } |
420 | } |
421 | |
422 | #ifdef USE_PRIMARY_BUFFER |
423 | /* This function tries to create a primary audio buffer, and returns the |
424 | number of audio chunks available in the created buffer. |
425 | */ |
426 | static int CreatePrimary(LPDIRECTSOUND sndObj, HWND focus, |
427 | LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize) |
428 | { |
429 | HRESULT result; |
430 | DSBUFFERDESC format; |
431 | DSBCAPS caps; |
432 | int numchunks; |
433 | |
434 | /* Try to set primary mixing privileges */ |
435 | result = IDirectSound_SetCooperativeLevel(sndObj, focus, |
436 | DSSCL_WRITEPRIMARY); |
437 | if ( result != DS_OK ) { |
438 | #ifdef DEBUG_SOUND |
439 | SetDSerror("DirectSound SetCooperativeLevel", result); |
440 | #endif |
441 | return(-1); |
442 | } |
443 | |
444 | /* Try to create the primary buffer */ |
445 | SDL_memset(&format, 0, sizeof(format)); |
446 | format.dwSize = sizeof(format); |
447 | format.dwFlags=(DSBCAPS_PRIMARYBUFFER|DSBCAPS_GETCURRENTPOSITION2); |
448 | format.dwFlags |= DSBCAPS_STICKYFOCUS; |
449 | #ifdef USE_POSITION_NOTIFY |
450 | format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY; |
451 | #endif |
452 | result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL); |
453 | if ( result != DS_OK ) { |
454 | #ifdef DEBUG_SOUND |
455 | SetDSerror("DirectSound CreateSoundBuffer", result); |
456 | #endif |
457 | return(-1); |
458 | } |
459 | |
460 | /* Check the size of the fragment buffer */ |
461 | SDL_memset(&caps, 0, sizeof(caps)); |
462 | caps.dwSize = sizeof(caps); |
463 | result = IDirectSoundBuffer_GetCaps(*sndbuf, &caps); |
464 | if ( result != DS_OK ) { |
465 | #ifdef DEBUG_SOUND |
466 | SetDSerror("DirectSound GetCaps", result); |
467 | #endif |
468 | IDirectSoundBuffer_Release(*sndbuf); |
469 | return(-1); |
470 | } |
471 | if ( (chunksize > caps.dwBufferBytes) || |
472 | ((caps.dwBufferBytes%chunksize) != 0) ) { |
473 | /* The primary buffer size is not a multiple of 'chunksize' |
474 | -- this hopefully doesn't happen when 'chunksize' is a |
475 | power of 2. |
476 | */ |
477 | IDirectSoundBuffer_Release(*sndbuf); |
478 | SDL_SetError( |
479 | "Primary buffer size is: %d, cannot break it into chunks of %d bytes\n", |
480 | caps.dwBufferBytes, chunksize); |
481 | return(-1); |
482 | } |
483 | numchunks = (caps.dwBufferBytes/chunksize); |
484 | |
485 | /* Set the primary audio format */ |
486 | result = IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt); |
487 | if ( result != DS_OK ) { |
488 | #ifdef DEBUG_SOUND |
489 | SetDSerror("DirectSound SetFormat", result); |
490 | #endif |
491 | IDirectSoundBuffer_Release(*sndbuf); |
492 | return(-1); |
493 | } |
494 | return(numchunks); |
495 | } |
496 | #endif /* USE_PRIMARY_BUFFER */ |
497 | |
498 | /* This function tries to create a secondary audio buffer, and returns the |
499 | number of audio chunks available in the created buffer. |
500 | */ |
501 | static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus, |
502 | LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize) |
503 | { |
504 | const int numchunks = 8; |
505 | HRESULT result; |
506 | DSBUFFERDESC format; |
507 | LPVOID pvAudioPtr1, pvAudioPtr2; |
508 | DWORD dwAudioBytes1, dwAudioBytes2; |
509 | |
510 | /* Try to set primary mixing privileges */ |
511 | if ( focus ) { |
512 | result = IDirectSound_SetCooperativeLevel(sndObj, |
513 | focus, DSSCL_PRIORITY); |
514 | } else { |
515 | result = IDirectSound_SetCooperativeLevel(sndObj, |
516 | GetDesktopWindow(), DSSCL_NORMAL); |
517 | } |
518 | if ( result != DS_OK ) { |
519 | #ifdef DEBUG_SOUND |
520 | SetDSerror("DirectSound SetCooperativeLevel", result); |
521 | #endif |
522 | return(-1); |
523 | } |
524 | |
525 | /* Try to create the secondary buffer */ |
526 | SDL_memset(&format, 0, sizeof(format)); |
527 | format.dwSize = sizeof(format); |
528 | format.dwFlags = DSBCAPS_GETCURRENTPOSITION2; |
529 | #ifdef USE_POSITION_NOTIFY |
530 | format.dwFlags |= DSBCAPS_CTRLPOSITIONNOTIFY; |
531 | #endif |
532 | if ( ! focus ) { |
533 | format.dwFlags |= DSBCAPS_GLOBALFOCUS; |
534 | } else { |
535 | format.dwFlags |= DSBCAPS_STICKYFOCUS; |
536 | } |
537 | format.dwBufferBytes = numchunks*chunksize; |
538 | if ( (format.dwBufferBytes < DSBSIZE_MIN) || |
539 | (format.dwBufferBytes > DSBSIZE_MAX) ) { |
540 | SDL_SetError("Sound buffer size must be between %d and %d", |
541 | DSBSIZE_MIN/numchunks, DSBSIZE_MAX/numchunks); |
542 | return(-1); |
543 | } |
544 | format.dwReserved = 0; |
545 | format.lpwfxFormat = wavefmt; |
546 | result = IDirectSound_CreateSoundBuffer(sndObj, &format, sndbuf, NULL); |
547 | if ( result != DS_OK ) { |
548 | SetDSerror("DirectSound CreateSoundBuffer", result); |
549 | return(-1); |
550 | } |
551 | IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt); |
552 | |
553 | /* Silence the initial audio buffer */ |
554 | result = IDirectSoundBuffer_Lock(*sndbuf, 0, format.dwBufferBytes, |
555 | (LPVOID *)&pvAudioPtr1, &dwAudioBytes1, |
556 | (LPVOID *)&pvAudioPtr2, &dwAudioBytes2, |
557 | DSBLOCK_ENTIREBUFFER); |
558 | if ( result == DS_OK ) { |
559 | if ( wavefmt->wBitsPerSample == 8 ) { |
560 | SDL_memset(pvAudioPtr1, 0x80, dwAudioBytes1); |
561 | } else { |
562 | SDL_memset(pvAudioPtr1, 0x00, dwAudioBytes1); |
563 | } |
564 | IDirectSoundBuffer_Unlock(*sndbuf, |
565 | (LPVOID)pvAudioPtr1, dwAudioBytes1, |
566 | (LPVOID)pvAudioPtr2, dwAudioBytes2); |
567 | } |
568 | |
569 | /* We're ready to go */ |
570 | return(numchunks); |
571 | } |
572 | |
573 | /* This function tries to set position notify events on the mixing buffer */ |
574 | #ifdef USE_POSITION_NOTIFY |
575 | static int CreateAudioEvent(_THIS) |
576 | { |
577 | LPDIRECTSOUNDNOTIFY notify; |
578 | DSBPOSITIONNOTIFY *notify_positions; |
579 | int i, retval; |
580 | HRESULT result; |
581 | |
582 | /* Default to fail on exit */ |
583 | retval = -1; |
584 | notify = NULL; |
585 | |
586 | /* Query for the interface */ |
587 | result = IDirectSoundBuffer_QueryInterface(mixbuf, |
588 | &IID_IDirectSoundNotify, (void *)¬ify); |
589 | if ( result != DS_OK ) { |
590 | goto done; |
591 | } |
592 | |
593 | /* Allocate the notify structures */ |
594 | notify_positions = (DSBPOSITIONNOTIFY *)SDL_malloc(NUM_BUFFERS* |
595 | sizeof(*notify_positions)); |
596 | if ( notify_positions == NULL ) { |
597 | goto done; |
598 | } |
599 | |
600 | /* Create the notify event */ |
601 | audio_event = CreateEvent(NULL, FALSE, FALSE, NULL); |
602 | if ( audio_event == NULL ) { |
603 | goto done; |
604 | } |
605 | |
606 | /* Set up the notify structures */ |
607 | for ( i=0; i<NUM_BUFFERS; ++i ) { |
608 | notify_positions[i].dwOffset = i*mixlen; |
609 | notify_positions[i].hEventNotify = audio_event; |
610 | } |
611 | result = IDirectSoundNotify_SetNotificationPositions(notify, |
612 | NUM_BUFFERS, notify_positions); |
613 | if ( result == DS_OK ) { |
614 | retval = 0; |
615 | } |
616 | done: |
617 | if ( notify != NULL ) { |
618 | IDirectSoundNotify_Release(notify); |
619 | } |
620 | return(retval); |
621 | } |
622 | #endif /* USE_POSITION_NOTIFY */ |
623 | |
624 | static int DX5_OpenAudio(_THIS, SDL_AudioSpec *spec) |
625 | { |
626 | HRESULT result; |
627 | WAVEFORMATEX waveformat; |
628 | |
629 | /* Set basic WAVE format parameters */ |
630 | SDL_memset(&waveformat, 0, sizeof(waveformat)); |
631 | waveformat.wFormatTag = WAVE_FORMAT_PCM; |
632 | |
633 | /* Determine the audio parameters from the AudioSpec */ |
634 | switch ( spec->format & 0xFF ) { |
635 | case 8: |
636 | /* Unsigned 8 bit audio data */ |
637 | spec->format = AUDIO_U8; |
638 | silence = 0x80; |
639 | waveformat.wBitsPerSample = 8; |
640 | break; |
641 | case 16: |
642 | /* Signed 16 bit audio data */ |
643 | spec->format = AUDIO_S16; |
644 | silence = 0x00; |
645 | waveformat.wBitsPerSample = 16; |
646 | break; |
647 | default: |
648 | SDL_SetError("Unsupported audio format"); |
649 | return(-1); |
650 | } |
651 | waveformat.nChannels = spec->channels; |
652 | waveformat.nSamplesPerSec = spec->freq; |
653 | waveformat.nBlockAlign = |
654 | waveformat.nChannels * (waveformat.wBitsPerSample/8); |
655 | waveformat.nAvgBytesPerSec = |
656 | waveformat.nSamplesPerSec * waveformat.nBlockAlign; |
657 | |
658 | /* Update the fragment size as size in bytes */ |
659 | SDL_CalculateAudioSpec(spec); |
660 | |
661 | /* Open the audio device */ |
662 | result = DSoundCreate(NULL, &sound, NULL); |
663 | if ( result != DS_OK ) { |
664 | SetDSerror("DirectSoundCreate", result); |
665 | return(-1); |
666 | } |
667 | |
668 | /* Create the audio buffer to which we write */ |
669 | NUM_BUFFERS = -1; |
670 | #ifdef USE_PRIMARY_BUFFER |
671 | if ( mainwin ) { |
672 | NUM_BUFFERS = CreatePrimary(sound, mainwin, &mixbuf, |
673 | &waveformat, spec->size); |
674 | } |
675 | #endif /* USE_PRIMARY_BUFFER */ |
676 | if ( NUM_BUFFERS < 0 ) { |
677 | NUM_BUFFERS = CreateSecondary(sound, mainwin, &mixbuf, |
678 | &waveformat, spec->size); |
679 | if ( NUM_BUFFERS < 0 ) { |
680 | return(-1); |
681 | } |
682 | #ifdef DEBUG_SOUND |
683 | fprintf(stderr, "Using secondary audio buffer\n"); |
684 | #endif |
685 | } |
686 | #ifdef DEBUG_SOUND |
687 | else |
688 | fprintf(stderr, "Using primary audio buffer\n"); |
689 | #endif |
690 | |
691 | /* The buffer will auto-start playing in DX5_WaitAudio() */ |
692 | lastchunk = 0; |
693 | mixlen = spec->size; |
694 | |
695 | #ifdef USE_POSITION_NOTIFY |
696 | /* See if we can use DirectX 6 event notification */ |
697 | if ( CreateAudioEvent(this) == 0 ) { |
698 | this->WaitAudio = DX6_WaitAudio_EventWait; |
699 | } else { |
700 | this->WaitAudio = DX5_WaitAudio_BusyWait; |
701 | } |
702 | #endif |
703 | return(0); |
704 | } |
705 | |