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Release 20050930.
[wine/gsoc-2012-control.git] / dlls / dsound / mixer.c
blob00695461ce3d89b5d8d8f7a2b75e6fb28e2fa4c9
1 /* DirectSound
2 *
3 * Copyright 1998 Marcus Meissner
4 * Copyright 1998 Rob Riggs
5 * Copyright 2000-2002 TransGaming Technologies, Inc.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <assert.h>
23 #include <stdarg.h>
24 #include <math.h> /* Insomnia - pow() function */
25
26 #define NONAMELESSSTRUCT
27 #define NONAMELESSUNION
28 #include "windef.h"
29 #include "winbase.h"
30 #include "mmsystem.h"
31 #include "winreg.h"
32 #include "winternl.h"
33 #include "wine/debug.h"
34 #include "dsound.h"
35 #include "dsdriver.h"
36 #include "dsound_private.h"
37
38 WINE_DEFAULT_DEBUG_CHANNEL(dsound);
39
40 void DSOUND_RecalcVolPan(PDSVOLUMEPAN volpan)
41 {
42 double temp;
43 TRACE("(%p)\n",volpan);
44
45 TRACE("Vol=%ld Pan=%ld\n", volpan->lVolume, volpan->lPan);
46 /* the AmpFactors are expressed in 16.16 fixed point */
47 volpan->dwVolAmpFactor = (ULONG) (pow(2.0, volpan->lVolume / 600.0) * 0xffff);
48 /* FIXME: dwPan{Left|Right}AmpFactor */
49
50 /* FIXME: use calculated vol and pan ampfactors */
51 temp = (double) (volpan->lVolume - (volpan->lPan > 0 ? volpan->lPan : 0));
52 volpan->dwTotalLeftAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 0xffff);
53 temp = (double) (volpan->lVolume + (volpan->lPan < 0 ? volpan->lPan : 0));
54 volpan->dwTotalRightAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 0xffff);
55
56 TRACE("left = %lx, right = %lx\n", volpan->dwTotalLeftAmpFactor, volpan->dwTotalRightAmpFactor);
57 }
58
59 void DSOUND_AmpFactorToVolPan(PDSVOLUMEPAN volpan)
60 {
61 double left,right;
62 TRACE("(%p)\n",volpan);
63
64 TRACE("left=%lx, right=%lx\n",volpan->dwTotalLeftAmpFactor,volpan->dwTotalRightAmpFactor);
65 if (volpan->dwTotalLeftAmpFactor==0)
66 left=-10000;
67 else
68 left=600 * log(((double)volpan->dwTotalLeftAmpFactor) / 0xffff) / log(2);
69 if (volpan->dwTotalRightAmpFactor==0)
70 right=-10000;
71 else
72 right=600 * log(((double)volpan->dwTotalRightAmpFactor) / 0xffff) / log(2);
73 if (left<right)
74 {
75 volpan->lVolume=right;
76 volpan->dwVolAmpFactor=volpan->dwTotalRightAmpFactor;
77 }
78 else
79 {
80 volpan->lVolume=left;
81 volpan->dwVolAmpFactor=volpan->dwTotalLeftAmpFactor;
82 }
83 if (volpan->lVolume < -10000)
84 volpan->lVolume=-10000;
85 volpan->lPan=right-left;
86 if (volpan->lPan < -10000)
87 volpan->lPan=-10000;
88
89 TRACE("Vol=%ld Pan=%ld\n", volpan->lVolume, volpan->lPan);
90 }
91
92 void DSOUND_RecalcFormat(IDirectSoundBufferImpl *dsb)
93 {
94 TRACE("(%p)\n",dsb);
95
96 /* calculate the 10ms write lead */
97 dsb->writelead = (dsb->freq / 100) * dsb->pwfx->nBlockAlign;
98 }
99
100 void DSOUND_CheckEvent(IDirectSoundBufferImpl *dsb, int len)
101 {
102 int i;
103 DWORD offset;
104 LPDSBPOSITIONNOTIFY event;
105 TRACE("(%p,%d)\n",dsb,len);
106
107 if (dsb->nrofnotifies == 0)
108 return;
109
110 TRACE("(%p) buflen = %ld, playpos = %ld, len = %d\n",
111 dsb, dsb->buflen, dsb->playpos, len);
112 for (i = 0; i < dsb->nrofnotifies ; i++) {
113 event = dsb->notifies + i;
114 offset = event->dwOffset;
115 TRACE("checking %d, position %ld, event = %p\n",
116 i, offset, event->hEventNotify);
117 /* DSBPN_OFFSETSTOP has to be the last element. So this is */
118 /* OK. [Inside DirectX, p274] */
119 /* */
120 /* This also means we can't sort the entries by offset, */
121 /* because DSBPN_OFFSETSTOP == -1 */
122 if (offset == DSBPN_OFFSETSTOP) {
123 if (dsb->state == STATE_STOPPED) {
124 SetEvent(event->hEventNotify);
125 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
126 return;
127 } else
128 return;
129 }
130 if ((dsb->playpos + len) >= dsb->buflen) {
131 if ((offset < ((dsb->playpos + len) % dsb->buflen)) ||
132 (offset >= dsb->playpos)) {
133 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
134 SetEvent(event->hEventNotify);
135 }
136 } else {
137 if ((offset >= dsb->playpos) && (offset < (dsb->playpos + len))) {
138 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
139 SetEvent(event->hEventNotify);
140 }
141 }
142 }
143 }
144
145 /* WAV format info can be found at:
146 *
147 * http://www.cwi.nl/ftp/audio/AudioFormats.part2
148 * ftp://ftp.cwi.nl/pub/audio/RIFF-format
149 *
150 * Import points to remember:
151 * 8-bit WAV is unsigned
152 * 16-bit WAV is signed
153 */
154 /* Use the same formulas as pcmconverter.c */
155 static inline INT16 cvtU8toS16(BYTE b)
156 {
157 return (short)((b+(b << 8))-32768);
158 }
159
160 static inline BYTE cvtS16toU8(INT16 s)
161 {
162 return (s >> 8) ^ (unsigned char)0x80;
163 }
164
165 static inline void cp_fields(const IDirectSoundBufferImpl *dsb, BYTE *ibuf, BYTE *obuf )
166 {
167 DirectSoundDevice * device = dsb->dsound->device;
168 INT fl,fr;
169
170 if (dsb->pwfx->wBitsPerSample == 8) {
171 if (device->pwfx->wBitsPerSample == 8 &&
172 device->pwfx->nChannels == dsb->pwfx->nChannels) {
173 /* avoid needless 8->16->8 conversion */
174 *obuf=*ibuf;
175 if (dsb->pwfx->nChannels==2)
176 *(obuf+1)=*(ibuf+1);
177 return;
178 }
179 fl = cvtU8toS16(*ibuf);
180 fr = (dsb->pwfx->nChannels==2 ? cvtU8toS16(*(ibuf + 1)) : fl);
181 } else {
182 fl = *((INT16 *)ibuf);
183 fr = (dsb->pwfx->nChannels==2 ? *(((INT16 *)ibuf) + 1) : fl);
184 }
185
186 if (device->pwfx->nChannels == 2) {
187 if (device->pwfx->wBitsPerSample == 8) {
188 *obuf = cvtS16toU8(fl);
189 *(obuf + 1) = cvtS16toU8(fr);
190 return;
191 }
192 if (device->pwfx->wBitsPerSample == 16) {
193 *((INT16 *)obuf) = fl;
194 *(((INT16 *)obuf) + 1) = fr;
195 return;
196 }
197 }
198 if (device->pwfx->nChannels == 1) {
199 fl = (fl + fr) >> 1;
200 if (device->pwfx->wBitsPerSample == 8) {
201 *obuf = cvtS16toU8(fl);
202 return;
203 }
204 if (device->pwfx->wBitsPerSample == 16) {
205 *((INT16 *)obuf) = fl;
206 return;
207 }
208 }
209 }
210
211 /* Now with PerfectPitch (tm) technology */
212 static INT DSOUND_MixerNorm(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
213 {
214 INT i, size, ipos, ilen;
215 BYTE *ibp, *obp;
216 INT iAdvance = dsb->pwfx->nBlockAlign;
217 INT oAdvance = dsb->dsound->device->pwfx->nBlockAlign;
218
219 ibp = dsb->buffer->memory + dsb->buf_mixpos;
220 obp = buf;
221
222 TRACE("(%p, %p, %p), buf_mixpos=%ld\n", dsb, ibp, obp, dsb->buf_mixpos);
223 /* Check for the best case */
224 if ((dsb->freq == dsb->dsound->device->pwfx->nSamplesPerSec) &&
225 (dsb->pwfx->wBitsPerSample == dsb->dsound->device->pwfx->wBitsPerSample) &&
226 (dsb->pwfx->nChannels == dsb->dsound->device->pwfx->nChannels)) {
227 INT bytesleft = dsb->buflen - dsb->buf_mixpos;
228 TRACE("(%p) Best case\n", dsb);
229 if (len <= bytesleft )
230 CopyMemory(obp, ibp, len);
231 else { /* wrap */
232 CopyMemory(obp, ibp, bytesleft);
233 CopyMemory(obp + bytesleft, dsb->buffer->memory, len - bytesleft);
234 }
235 return len;
236 }
237
238 /* Check for same sample rate */
239 if (dsb->freq == dsb->dsound->device->pwfx->nSamplesPerSec) {
240 TRACE("(%p) Same sample rate %ld = primary %ld\n", dsb,
241 dsb->freq, dsb->dsound->device->pwfx->nSamplesPerSec);
242 ilen = 0;
243 for (i = 0; i < len; i += oAdvance) {
244 cp_fields(dsb, ibp, obp );
245 ibp += iAdvance;
246 ilen += iAdvance;
247 obp += oAdvance;
248 if (ibp >= (BYTE *)(dsb->buffer->memory + dsb->buflen))
249 ibp = dsb->buffer->memory; /* wrap */
250 }
251 return (ilen);
252 }
253
254 /* Mix in different sample rates */
255 /* */
256 /* New PerfectPitch(tm) Technology (c) 1998 Rob Riggs */
257 /* Patent Pending :-] */
258
259 /* Patent enhancements (c) 2000 Ove Kåven,
260 * TransGaming Technologies Inc. */
261
262 /* FIXME("(%p) Adjusting frequency: %ld -> %ld (need optimization)\n",
263 dsb, dsb->freq, dsb->dsound->device->pwfx->nSamplesPerSec); */
264
265 size = len / oAdvance;
266 ilen = 0;
267 ipos = dsb->buf_mixpos;
268 for (i = 0; i < size; i++) {
269 cp_fields(dsb, (dsb->buffer->memory + ipos), obp);
270 obp += oAdvance;
271 dsb->freqAcc += dsb->freqAdjust;
272 if (dsb->freqAcc >= (1<<DSOUND_FREQSHIFT)) {
273 ULONG adv = (dsb->freqAcc>>DSOUND_FREQSHIFT) * iAdvance;
274 dsb->freqAcc &= (1<<DSOUND_FREQSHIFT)-1;
275 ipos += adv; ilen += adv;
276 ipos %= dsb->buflen;
277 }
278 }
279 return ilen;
280 }
281
282 static void DSOUND_MixerVol(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
283 {
284 INT i;
285 BYTE *bpc = buf;
286 INT16 *bps = (INT16 *) buf;
287
288 TRACE("(%p,%p,%d)\n",dsb,buf,len);
289 TRACE("left = %lx, right = %lx\n", dsb->cvolpan.dwTotalLeftAmpFactor,
290 dsb->cvolpan.dwTotalRightAmpFactor);
291
292 if ((!(dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) || (dsb->cvolpan.lPan == 0)) &&
293 (!(dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) || (dsb->cvolpan.lVolume == 0)) &&
294 !(dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
295 return; /* Nothing to do */
296
297 /* If we end up with some bozo coder using panning or 3D sound */
298 /* with a mono primary buffer, it could sound very weird using */
299 /* this method. Oh well, tough patooties. */
300
301 switch (dsb->dsound->device->pwfx->wBitsPerSample) {
302 case 8:
303 /* 8-bit WAV is unsigned, but we need to operate */
304 /* on signed data for this to work properly */
305 switch (dsb->dsound->device->pwfx->nChannels) {
306 case 1:
307 for (i = 0; i < len; i++) {
308 INT val = *bpc - 128;
309 val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
310 *bpc = val + 128;
311 bpc++;
312 }
313 break;
314 case 2:
315 for (i = 0; i < len; i+=2) {
316 INT val = *bpc - 128;
317 val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
318 *bpc++ = val + 128;
319 val = *bpc - 128;
320 val = (val * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
321 *bpc = val + 128;
322 bpc++;
323 }
324 break;
325 default:
326 FIXME("doesn't support %d channels\n", dsb->dsound->device->pwfx->nChannels);
327 break;
328 }
329 break;
330 case 16:
331 /* 16-bit WAV is signed -- much better */
332 switch (dsb->dsound->device->pwfx->nChannels) {
333 case 1:
334 for (i = 0; i < len; i += 2) {
335 *bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
336 bps++;
337 }
338 break;
339 case 2:
340 for (i = 0; i < len; i += 4) {
341 *bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
342 bps++;
343 *bps = (*bps * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
344 bps++;
345 }
346 break;
347 default:
348 FIXME("doesn't support %d channels\n", dsb->dsound->device->pwfx->nChannels);
349 break;
350 }
351 break;
352 default:
353 FIXME("doesn't support %d bit samples\n", dsb->dsound->device->pwfx->wBitsPerSample);
354 break;
355 }
356 }
357
358 static LPBYTE DSOUND_tmpbuffer(DirectSoundDevice *device, DWORD len)
359 {
360 TRACE("(%p,%ld)\n", device, len);
361
362 if (len > device->tmp_buffer_len) {
363 if (device->tmp_buffer)
364 device->tmp_buffer = HeapReAlloc(GetProcessHeap(), 0, device->tmp_buffer, len);
365 else
366 device->tmp_buffer = HeapAlloc(GetProcessHeap(), 0, len);
367
368 device->tmp_buffer_len = len;
369 }
370
371 return device->tmp_buffer;
372 }
373
374 static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD fraglen)
375 {
376 INT i, len, ilen, field, todo;
377 BYTE *buf, *ibuf;
378
379 TRACE("(%p,%ld,%ld)\n",dsb,writepos,fraglen);
380
381 len = fraglen;
382 if (!(dsb->playflags & DSBPLAY_LOOPING)) {
383 int secondary_remainder = dsb->buflen - dsb->buf_mixpos;
384 int adjusted_remainder = MulDiv(dsb->dsound->device->pwfx->nAvgBytesPerSec, secondary_remainder, dsb->nAvgBytesPerSec);
385 assert(adjusted_remainder >= 0);
386 TRACE("secondary_remainder = %d, adjusted_remainder = %d, len = %d\n", secondary_remainder, adjusted_remainder, len);
387 if (adjusted_remainder < len) {
388 TRACE("clipping len to remainder of secondary buffer\n");
389 len = adjusted_remainder;
390 }
391 if (len == 0)
392 return 0;
393 }
394
395 if (len % dsb->dsound->device->pwfx->nBlockAlign) {
396 INT nBlockAlign = dsb->dsound->device->pwfx->nBlockAlign;
397 ERR("length not a multiple of block size, len = %d, block size = %d\n", len, nBlockAlign);
398 len = (len / nBlockAlign) * nBlockAlign; /* data alignment */
399 }
400
401 if ((buf = ibuf = DSOUND_tmpbuffer(dsb->dsound->device, len)) == NULL)
402 return 0;
403
404 TRACE("MixInBuffer (%p) len = %d, dest = %ld\n", dsb, len, writepos);
405
406 ilen = DSOUND_MixerNorm(dsb, ibuf, len);
407 if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
408 (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
409 (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
410 DSOUND_MixerVol(dsb, ibuf, len);
411
412 if (dsb->dsound->device->pwfx->wBitsPerSample == 8) {
413 BYTE *obuf = dsb->dsound->device->buffer + writepos;
414
415 if ((writepos + len) <= dsb->dsound->device->buflen)
416 todo = len;
417 else
418 todo = dsb->dsound->device->buflen - writepos;
419
420 for (i = 0; i < todo; i++) {
421 /* 8-bit WAV is unsigned */
422 field = (*ibuf++ - 128);
423 field += (*obuf - 128);
424 if (field > 127) field = 127;
425 else if (field < -128) field = -128;
426 *obuf++ = field + 128;
427 }
428
429 if (todo < len) {
430 todo = len - todo;
431 obuf = dsb->dsound->device->buffer;
432
433 for (i = 0; i < todo; i++) {
434 /* 8-bit WAV is unsigned */
435 field = (*ibuf++ - 128);
436 field += (*obuf - 128);
437 if (field > 127) field = 127;
438 else if (field < -128) field = -128;
439 *obuf++ = field + 128;
440 }
441 }
442 } else {
443 INT16 *ibufs, *obufs;
444
445 ibufs = (INT16 *) ibuf;
446 obufs = (INT16 *)(dsb->dsound->device->buffer + writepos);
447
448 if ((writepos + len) <= dsb->dsound->device->buflen)
449 todo = len / 2;
450 else
451 todo = (dsb->dsound->device->buflen - writepos) / 2;
452
453 for (i = 0; i < todo; i++) {
454 /* 16-bit WAV is signed */
455 field = *ibufs++;
456 field += *obufs;
457 if (field > 32767) field = 32767;
458 else if (field < -32768) field = -32768;
459 *obufs++ = field;
460 }
461
462 if (todo < (len / 2)) {
463 todo = (len / 2) - todo;
464 obufs = (INT16 *)dsb->dsound->device->buffer;
465
466 for (i = 0; i < todo; i++) {
467 /* 16-bit WAV is signed */
468 field = *ibufs++;
469 field += *obufs;
470 if (field > 32767) field = 32767;
471 else if (field < -32768) field = -32768;
472 *obufs++ = field;
473 }
474 }
475 }
476
477 if (dsb->leadin && (dsb->startpos > dsb->buf_mixpos) && (dsb->startpos <= dsb->buf_mixpos + ilen)) {
478 /* HACK... leadin should be reset when the PLAY position reaches the startpos,
479 * not the MIX position... but if the sound buffer is bigger than our prebuffering
480 * (which must be the case for the streaming buffers that need this hack anyway)
481 * plus DS_HEL_MARGIN or equivalent, then this ought to work anyway. */
482 dsb->leadin = FALSE;
483 }
484
485 dsb->buf_mixpos += ilen;
486
487 if (dsb->buf_mixpos >= dsb->buflen) {
488 if (dsb->playflags & DSBPLAY_LOOPING) {
489 /* wrap */
490 dsb->buf_mixpos %= dsb->buflen;
491 if (dsb->leadin && (dsb->startpos <= dsb->buf_mixpos))
492 dsb->leadin = FALSE; /* HACK: see above */
493 } else if (dsb->buf_mixpos > dsb->buflen) {
494 ERR("Mixpos (%lu) past buflen (%lu), capping...\n", dsb->buf_mixpos, dsb->buflen);
495 dsb->buf_mixpos = dsb->buflen;
496 }
497 }
498
499 return len;
500 }
501
502 static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD len)
503 {
504 INT ilen, field;
505 UINT i, todo;
506 BYTE *buf, *ibuf;
507
508 TRACE("(%p,%ld,%ld)\n",dsb,writepos,len);
509
510 if (len % dsb->dsound->device->pwfx->nBlockAlign) {
511 INT nBlockAlign = dsb->dsound->device->pwfx->nBlockAlign;
512 ERR("length not a multiple of block size, len = %ld, block size = %d\n", len, nBlockAlign);
513 len = (len / nBlockAlign) * nBlockAlign; /* data alignment */
514 }
515
516 if ((buf = ibuf = DSOUND_tmpbuffer(dsb->dsound->device, len)) == NULL)
517 return;
518
519 TRACE("PhaseCancel (%p) len = %ld, dest = %ld\n", dsb, len, writepos);
520
521 ilen = DSOUND_MixerNorm(dsb, ibuf, len);
522 if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
523 (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
524 (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
525 DSOUND_MixerVol(dsb, ibuf, len);
526
527 /* subtract instead of add, to phase out premixed data */
528 if (dsb->dsound->device->pwfx->wBitsPerSample == 8) {
529 BYTE *obuf = dsb->dsound->device->buffer + writepos;
530
531 if ((writepos + len) <= dsb->dsound->device->buflen)
532 todo = len;
533 else
534 todo = dsb->dsound->device->buflen - writepos;
535
536 for (i = 0; i < todo; i++) {
537 /* 8-bit WAV is unsigned */
538 field = (*ibuf++ - 128);
539 field -= (*obuf - 128);
540 if (field > 127) field = 127;
541 else if (field < -128) field = -128;
542 *obuf++ = field + 128;
543 }
544
545 if (todo < len) {
546 todo = len - todo;
547 obuf = dsb->dsound->device->buffer;
548
549 for (i = 0; i < todo; i++) {
550 /* 8-bit WAV is unsigned */
551 field = (*ibuf++ - 128);
552 field -= (*obuf - 128);
553 if (field > 127) field = 127;
554 else if (field < -128) field = -128;
555 *obuf++ = field + 128;
556 }
557 }
558 } else {
559 INT16 *ibufs, *obufs;
560
561 ibufs = (INT16 *) ibuf;
562 obufs = (INT16 *)(dsb->dsound->device->buffer + writepos);
563
564 if ((writepos + len) <= dsb->dsound->device->buflen)
565 todo = len / 2;
566 else
567 todo = (dsb->dsound->device->buflen - writepos) / 2;
568
569 for (i = 0; i < todo; i++) {
570 /* 16-bit WAV is signed */
571 field = *ibufs++;
572 field -= *obufs;
573 if (field > 32767) field = 32767;
574 else if (field < -32768) field = -32768;
575 *obufs++ = field;
576 }
577
578 if (todo < (len / 2)) {
579 todo = (len / 2) - todo;
580 obufs = (INT16 *)dsb->dsound->device->buffer;
581
582 for (i = 0; i < todo; i++) {
583 /* 16-bit WAV is signed */
584 field = *ibufs++;
585 field -= *obufs;
586 if (field > 32767) field = 32767;
587 else if (field < -32768) field = -32768;
588 *obufs++ = field;
589 }
590 }
591 }
592 }
593
594 static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)
595 {
596 DWORD size, flen, len, npos, nlen;
597 INT iAdvance = dsb->pwfx->nBlockAlign;
598 INT oAdvance = dsb->dsound->device->pwfx->nBlockAlign;
599 /* determine amount of premixed data to cancel */
600 DWORD primary_done =
601 ((dsb->primary_mixpos < writepos) ? dsb->dsound->device->buflen : 0) +
602 dsb->primary_mixpos - writepos;
603
604 TRACE("(%p, %ld), buf_mixpos=%ld\n", dsb, writepos, dsb->buf_mixpos);
605
606 /* backtrack the mix position */
607 size = primary_done / oAdvance;
608 flen = size * dsb->freqAdjust;
609 len = (flen >> DSOUND_FREQSHIFT) * iAdvance;
610 flen &= (1<<DSOUND_FREQSHIFT)-1;
611 while (dsb->freqAcc < flen) {
612 len += iAdvance;
613 dsb->freqAcc += 1<<DSOUND_FREQSHIFT;
614 }
615 len %= dsb->buflen;
616 npos = ((dsb->buf_mixpos < len) ? dsb->buflen : 0) +
617 dsb->buf_mixpos - len;
618 if (dsb->leadin && (dsb->startpos > npos) && (dsb->startpos <= npos + len)) {
619 /* stop backtracking at startpos */
620 npos = dsb->startpos;
621 len = ((dsb->buf_mixpos < npos) ? dsb->buflen : 0) +
622 dsb->buf_mixpos - npos;
623 flen = dsb->freqAcc;
624 nlen = len / dsb->pwfx->nBlockAlign;
625 nlen = ((nlen << DSOUND_FREQSHIFT) + flen) / dsb->freqAdjust;
626 nlen *= dsb->dsound->device->pwfx->nBlockAlign;
627 writepos =
628 ((dsb->primary_mixpos < nlen) ? dsb->dsound->device->buflen : 0) +
629 dsb->primary_mixpos - nlen;
630 }
631
632 dsb->freqAcc -= flen;
633 dsb->buf_mixpos = npos;
634 dsb->primary_mixpos = writepos;
635
636 TRACE("new buf_mixpos=%ld, primary_mixpos=%ld (len=%ld)\n",
637 dsb->buf_mixpos, dsb->primary_mixpos, len);
638
639 if (cancel) DSOUND_PhaseCancel(dsb, writepos, len);
640 }
641
642 void DSOUND_MixCancelAt(IDirectSoundBufferImpl *dsb, DWORD buf_writepos)
643 {
644 #if 0
645 DWORD i, size, flen, len, npos, nlen;
646 INT iAdvance = dsb->pwfx->nBlockAlign;
647 INT oAdvance = dsb->dsound->device->pwfx->nBlockAlign;
648 /* determine amount of premixed data to cancel */
649 DWORD buf_done =
650 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
651 dsb->buf_mixpos - buf_writepos;
652 #endif
653
654 WARN("(%p, %ld), buf_mixpos=%ld\n", dsb, buf_writepos, dsb->buf_mixpos);
655 /* since this is not implemented yet, just cancel *ALL* prebuffering for now
656 * (which is faster anyway when there's only a single secondary buffer) */
657 dsb->dsound->device->need_remix = TRUE;
658 }
659
660 void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
661 {
662 TRACE("(%p)\n",dsb);
663 EnterCriticalSection(&dsb->lock);
664 if (dsb->state == STATE_PLAYING)
665 dsb->dsound->device->need_remix = TRUE;
666 LeaveCriticalSection(&dsb->lock);
667 }
668
669 static DWORD DSOUND_MixOne(IDirectSoundBufferImpl *dsb, DWORD playpos, DWORD writepos, DWORD mixlen)
670 {
671 DWORD len, slen;
672 /* determine this buffer's write position */
673 DWORD buf_writepos = DSOUND_CalcPlayPosition(dsb, writepos, writepos);
674 /* determine how much already-mixed data exists */
675 DWORD buf_done =
676 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
677 dsb->buf_mixpos - buf_writepos;
678 DWORD primary_done =
679 ((dsb->primary_mixpos < writepos) ? dsb->dsound->device->buflen : 0) +
680 dsb->primary_mixpos - writepos;
681 DWORD adv_done =
682 ((dsb->dsound->device->mixpos < writepos) ? dsb->dsound->device->buflen : 0) +
683 dsb->dsound->device->mixpos - writepos;
684 DWORD played =
685 ((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
686 buf_writepos - dsb->playpos;
687 DWORD buf_left = dsb->buflen - buf_writepos;
688 int still_behind;
689
690 TRACE("(%p,%ld,%ld,%ld)\n",dsb,playpos,writepos,mixlen);
691 TRACE("buf_writepos=%ld, primary_writepos=%ld\n", buf_writepos, writepos);
692 TRACE("buf_done=%ld, primary_done=%ld\n", buf_done, primary_done);
693 TRACE("buf_mixpos=%ld, primary_mixpos=%ld, mixlen=%ld\n", dsb->buf_mixpos, dsb->primary_mixpos,
694 mixlen);
695 TRACE("looping=%ld, startpos=%ld, leadin=%ld\n", dsb->playflags, dsb->startpos, dsb->leadin);
696
697 /* check for notification positions */
698 if (dsb->dsbd.dwFlags & DSBCAPS_CTRLPOSITIONNOTIFY &&
699 dsb->state != STATE_STARTING) {
700 DSOUND_CheckEvent(dsb, played);
701 }
702
703 /* save write position for non-GETCURRENTPOSITION2... */
704 dsb->playpos = buf_writepos;
705
706 /* check whether CalcPlayPosition detected a mixing underrun */
707 if ((buf_done == 0) && (dsb->primary_mixpos != writepos)) {
708 /* it did, but did we have more to play? */
709 if ((dsb->playflags & DSBPLAY_LOOPING) ||
710 (dsb->buf_mixpos < dsb->buflen)) {
711 /* yes, have to recover */
712 ERR("underrun on sound buffer %p\n", dsb);
713 TRACE("recovering from underrun: primary_mixpos=%ld\n", writepos);
714 }
715 dsb->primary_mixpos = writepos;
716 primary_done = 0;
717 }
718 /* determine how far ahead we should mix */
719 if (((dsb->playflags & DSBPLAY_LOOPING) ||
720 (dsb->leadin && (dsb->probably_valid_to != 0))) &&
721 !(dsb->dsbd.dwFlags & DSBCAPS_STATIC)) {
722 /* if this is a streaming buffer, it typically means that
723 * we should defer mixing past probably_valid_to as long
724 * as we can, to avoid unnecessary remixing */
725 /* the heavy-looking calculations shouldn't be that bad,
726 * as any game isn't likely to be have more than 1 or 2
727 * streaming buffers in use at any time anyway... */
728 DWORD probably_valid_left =
729 (dsb->probably_valid_to == (DWORD)-1) ? dsb->buflen :
730 ((dsb->probably_valid_to < buf_writepos) ? dsb->buflen : 0) +
731 dsb->probably_valid_to - buf_writepos;
732 /* check for leadin condition */
733 if ((probably_valid_left == 0) &&
734 (dsb->probably_valid_to == dsb->startpos) &&
735 dsb->leadin)
736 probably_valid_left = dsb->buflen;
737 TRACE("streaming buffer probably_valid_to=%ld, probably_valid_left=%ld\n",
738 dsb->probably_valid_to, probably_valid_left);
739 /* check whether the app's time is already up */
740 if (probably_valid_left < dsb->writelead) {
741 WARN("probably_valid_to now within writelead, possible streaming underrun\n");
742 /* once we pass the point of no return,
743 * no reason to hold back anymore */
744 dsb->probably_valid_to = (DWORD)-1;
745 /* we just have to go ahead and mix what we have,
746 * there's no telling what the app is thinking anyway */
747 } else {
748 /* adjust for our frequency and our sample size */
749 probably_valid_left = MulDiv(probably_valid_left,
750 1 << DSOUND_FREQSHIFT,
751 dsb->pwfx->nBlockAlign * dsb->freqAdjust) *
752 dsb->dsound->device->pwfx->nBlockAlign;
753 /* check whether to clip mix_len */
754 if (probably_valid_left < mixlen) {
755 TRACE("clipping to probably_valid_left=%ld\n", probably_valid_left);
756 mixlen = probably_valid_left;
757 }
758 }
759 }
760 /* cut mixlen with what's already been mixed */
761 if (mixlen < primary_done) {
762 /* huh? and still CalcPlayPosition didn't
763 * detect an underrun? */
764 FIXME("problem with underrun detection (mixlen=%ld < primary_done=%ld)\n", mixlen, primary_done);
765 return 0;
766 }
767 len = mixlen - primary_done;
768 TRACE("remaining mixlen=%ld\n", len);
769
770 if (len < dsb->dsound->device->fraglen) {
771 /* smaller than a fragment, wait until it gets larger
772 * before we take the mixing overhead */
773 TRACE("mixlen not worth it, deferring mixing\n");
774 still_behind = 1;
775 goto post_mix;
776 }
777
778 /* ok, we know how much to mix, let's go */
779 still_behind = (adv_done > primary_done);
780 while (len) {
781 slen = dsb->dsound->device->buflen - dsb->primary_mixpos;
782 if (slen > len) slen = len;
783 slen = DSOUND_MixInBuffer(dsb, dsb->primary_mixpos, slen);
784
785 if ((dsb->primary_mixpos < dsb->dsound->device->mixpos) &&
786 (dsb->primary_mixpos + slen >= dsb->dsound->device->mixpos))
787 still_behind = FALSE;
788
789 dsb->primary_mixpos += slen; len -= slen;
790 dsb->primary_mixpos %= dsb->dsound->device->buflen;
791
792 if ((dsb->state == STATE_STOPPED) || !slen) break;
793 }
794 TRACE("new primary_mixpos=%ld, primary_advbase=%ld\n", dsb->primary_mixpos, dsb->dsound->device->mixpos);
795 TRACE("mixed data len=%ld, still_behind=%d\n", mixlen-len, still_behind);
796
797 post_mix:
798 /* check if buffer should be considered complete */
799 if (buf_left < dsb->writelead &&
800 !(dsb->playflags & DSBPLAY_LOOPING)) {
801 dsb->state = STATE_STOPPED;
802 dsb->playpos = 0;
803 dsb->last_playpos = 0;
804 dsb->buf_mixpos = 0;
805 dsb->leadin = FALSE;
806 dsb->need_remix = FALSE;
807 DSOUND_CheckEvent(dsb, buf_left);
808 }
809
810 /* return how far we think the primary buffer can
811 * advance its underrun detector...*/
812 if (still_behind) return 0;
813 if ((mixlen - len) < primary_done) return 0;
814 slen = ((dsb->primary_mixpos < dsb->dsound->device->mixpos) ?
815 dsb->dsound->device->buflen : 0) + dsb->primary_mixpos -
816 dsb->dsound->device->mixpos;
817 if (slen > mixlen) {
818 /* the primary_done and still_behind checks above should have worked */
819 FIXME("problem with advancement calculation (advlen=%ld > mixlen=%ld)\n", slen, mixlen);
820 slen = 0;
821 }
822 return slen;
823 }
824
825 static DWORD DSOUND_MixToPrimary(DirectSoundDevice *device, DWORD playpos, DWORD writepos, DWORD mixlen, BOOL recover)
826 {
827 INT i, len, maxlen = 0;
828 IDirectSoundBufferImpl *dsb;
829
830 TRACE("(%ld,%ld,%ld,%d)\n", playpos, writepos, mixlen, recover);
831 for (i = 0; i < device->nrofbuffers; i++) {
832 dsb = device->buffers[i];
833
834 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
835 TRACE("Checking %p, mixlen=%ld\n", dsb, mixlen);
836 EnterCriticalSection(&(dsb->lock));
837 if (dsb->state == STATE_STOPPING) {
838 DSOUND_MixCancel(dsb, writepos, TRUE);
839 dsb->state = STATE_STOPPED;
840 DSOUND_CheckEvent(dsb, 0);
841 } else {
842 if ((dsb->state == STATE_STARTING) || recover) {
843 dsb->primary_mixpos = writepos;
844 dsb->cvolpan = dsb->volpan;
845 dsb->need_remix = FALSE;
846 }
847 else if (dsb->need_remix) {
848 DSOUND_MixCancel(dsb, writepos, TRUE);
849 dsb->cvolpan = dsb->volpan;
850 dsb->need_remix = FALSE;
851 }
852 len = DSOUND_MixOne(dsb, playpos, writepos, mixlen);
853 if (dsb->state == STATE_STARTING)
854 dsb->state = STATE_PLAYING;
855 maxlen = (len > maxlen) ? len : maxlen;
856 }
857 LeaveCriticalSection(&(dsb->lock));
858 }
859 }
860
861 return maxlen;
862 }
863
864 static void DSOUND_MixReset(DirectSoundDevice *device, DWORD writepos)
865 {
866 INT i;
867 IDirectSoundBufferImpl *dsb;
868 int nfiller;
869
870 TRACE("(%p,%ld)\n", device, writepos);
871
872 /* the sound of silence */
873 nfiller = device->pwfx->wBitsPerSample == 8 ? 128 : 0;
874
875 /* reset all buffer mix positions */
876 for (i = 0; i < device->nrofbuffers; i++) {
877 dsb = device->buffers[i];
878
879 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
880 TRACE("Resetting %p\n", dsb);
881 EnterCriticalSection(&(dsb->lock));
882 if (dsb->state == STATE_STOPPING) {
883 dsb->state = STATE_STOPPED;
884 }
885 else if (dsb->state == STATE_STARTING) {
886 /* nothing */
887 } else {
888 DSOUND_MixCancel(dsb, writepos, FALSE);
889 dsb->cvolpan = dsb->volpan;
890 dsb->need_remix = FALSE;
891 }
892 LeaveCriticalSection(&(dsb->lock));
893 }
894 }
895
896 /* wipe out premixed data */
897 if (device->mixpos < writepos) {
898 FillMemory(device->buffer + writepos, device->buflen - writepos, nfiller);
899 FillMemory(device->buffer, device->mixpos, nfiller);
900 } else {
901 FillMemory(device->buffer + writepos, device->mixpos - writepos, nfiller);
902 }
903
904 /* reset primary mix position */
905 device->mixpos = writepos;
906 }
907
908 static void DSOUND_CheckReset(DirectSoundDevice *device, DWORD writepos)
909 {
910 TRACE("(%p,%ld)\n",device,writepos);
911 if (device->need_remix) {
912 DSOUND_MixReset(device, writepos);
913 device->need_remix = FALSE;
914 /* maximize Half-Life performance */
915 device->prebuf = ds_snd_queue_min;
916 device->precount = 0;
917 } else {
918 device->precount++;
919 if (device->precount >= 4) {
920 if (device->prebuf < ds_snd_queue_max)
921 device->prebuf++;
922 device->precount = 0;
923 }
924 }
925 TRACE("premix adjust: %d\n", device->prebuf);
926 }
927
928 void DSOUND_WaveQueue(DirectSoundDevice *device, DWORD mixq)
929 {
930 TRACE("(%p,%ld)\n", device, mixq);
931 if (mixq + device->pwqueue > ds_hel_queue) mixq = ds_hel_queue - device->pwqueue;
932 TRACE("queueing %ld buffers, starting at %d\n", mixq, device->pwwrite);
933 for (; mixq; mixq--) {
934 waveOutWrite(device->hwo, device->pwave[device->pwwrite], sizeof(WAVEHDR));
935 device->pwwrite++;
936 if (device->pwwrite >= DS_HEL_FRAGS) device->pwwrite = 0;
937 device->pwqueue++;
938 }
939 }
940
941 /* #define SYNC_CALLBACK */
942
943 void DSOUND_PerformMix(DirectSoundDevice *device)
944 {
945 int nfiller;
946 BOOL forced;
947 HRESULT hres;
948
949 TRACE("(%p)\n", device);
950
951 /* the sound of silence */
952 nfiller = device->pwfx->wBitsPerSample == 8 ? 128 : 0;
953
954 /* whether the primary is forced to play even without secondary buffers */
955 forced = ((device->state == STATE_PLAYING) || (device->state == STATE_STARTING));
956
957 if (device->priolevel != DSSCL_WRITEPRIMARY) {
958 BOOL paused = ((device->state == STATE_STOPPED) || (device->state == STATE_STARTING));
959 /* FIXME: document variables */
960 DWORD playpos, writepos, inq, maxq, frag;
961 if (device->hwbuf) {
962 hres = IDsDriverBuffer_GetPosition(device->hwbuf, &playpos, &writepos);
963 if (hres) {
964 WARN("IDsDriverBuffer_GetPosition failed\n");
965 return;
966 }
967 /* Well, we *could* do Just-In-Time mixing using the writepos,
968 * but that's a little bit ambitious and unnecessary... */
969 /* rather add our safety margin to the writepos, if we're playing */
970 if (!paused) {
971 writepos += device->writelead;
972 writepos %= device->buflen;
973 } else writepos = playpos;
974 } else {
975 playpos = device->pwplay * device->fraglen;
976 writepos = playpos;
977 if (!paused) {
978 writepos += ds_hel_margin * device->fraglen;
979 writepos %= device->buflen;
980 }
981 }
982 TRACE("primary playpos=%ld, writepos=%ld, clrpos=%ld, mixpos=%ld, buflen=%ld\n",
983 playpos,writepos,device->playpos,device->mixpos,device->buflen);
984 assert(device->playpos < device->buflen);
985 /* wipe out just-played sound data */
986 if (playpos < device->playpos) {
987 FillMemory(device->buffer + device->playpos, device->buflen - device->playpos, nfiller);
988 FillMemory(device->buffer, playpos, nfiller);
989 } else {
990 FillMemory(device->buffer + device->playpos, playpos - device->playpos, nfiller);
991 }
992 device->playpos = playpos;
993
994 EnterCriticalSection(&(device->mixlock));
995
996 /* reset mixing if necessary */
997 DSOUND_CheckReset(device, writepos);
998
999 /* check how much prebuffering is left */
1000 inq = device->mixpos;
1001 if (inq < writepos)
1002 inq += device->buflen;
1003 inq -= writepos;
1004
1005 /* find the maximum we can prebuffer */
1006 if (!paused) {
1007 maxq = playpos;
1008 if (maxq < writepos)
1009 maxq += device->buflen;
1010 maxq -= writepos;
1011 } else maxq = device->buflen;
1012
1013 /* clip maxq to device->prebuf */
1014 frag = device->prebuf * device->fraglen;
1015 if (maxq > frag) maxq = frag;
1016
1017 /* check for consistency */
1018 if (inq > maxq) {
1019 /* the playback position must have passed our last
1020 * mixed position, i.e. it's an underrun, or we have
1021 * nothing more to play */
1022 TRACE("reached end of mixed data (inq=%ld, maxq=%ld)\n", inq, maxq);
1023 inq = 0;
1024 /* stop the playback now, to allow buffers to refill */
1025 if (device->state == STATE_PLAYING) {
1026 device->state = STATE_STARTING;
1027 }
1028 else if (device->state == STATE_STOPPING) {
1029 device->state = STATE_STOPPED;
1030 }
1031 else {
1032 /* how can we have an underrun if we aren't playing? */
1033 WARN("unexpected primary state (%ld)\n", device->state);
1034 }
1035 #ifdef SYNC_CALLBACK
1036 /* DSOUND_callback may need this lock */
1037 LeaveCriticalSection(&(device->mixlock));
1038 #endif
1039 if (DSOUND_PrimaryStop(device) != DS_OK)
1040 WARN("DSOUND_PrimaryStop failed\n");
1041 #ifdef SYNC_CALLBACK
1042 EnterCriticalSection(&(device->mixlock));
1043 #endif
1044 if (device->hwbuf) {
1045 /* the Stop is supposed to reset play position to beginning of buffer */
1046 /* unfortunately, OSS is not able to do so, so get current pointer */
1047 hres = IDsDriverBuffer_GetPosition(device->hwbuf, &playpos, NULL);
1048 if (hres) {
1049 LeaveCriticalSection(&(device->mixlock));
1050 WARN("IDsDriverBuffer_GetPosition failed\n");
1051 return;
1052 }
1053 } else {
1054 playpos = device->pwplay * device->fraglen;
1055 }
1056 writepos = playpos;
1057 device->playpos = playpos;
1058 device->mixpos = writepos;
1059 inq = 0;
1060 maxq = device->buflen;
1061 if (maxq > frag) maxq = frag;
1062 FillMemory(device->buffer, device->buflen, nfiller);
1063 paused = TRUE;
1064 }
1065
1066 /* do the mixing */
1067 frag = DSOUND_MixToPrimary(device, playpos, writepos, maxq, paused);
1068 if (forced) frag = maxq - inq;
1069 device->mixpos += frag;
1070 device->mixpos %= device->buflen;
1071
1072 if (frag) {
1073 /* buffers have been filled, restart playback */
1074 if (device->state == STATE_STARTING) {
1075 device->state = STATE_PLAYING;
1076 }
1077 else if (device->state == STATE_STOPPED) {
1078 /* the dsound is supposed to play if there's something to play
1079 * even if it is reported as stopped, so don't let this confuse you */
1080 device->state = STATE_STOPPING;
1081 }
1082 LeaveCriticalSection(&(device->mixlock));
1083 if (paused) {
1084 if (DSOUND_PrimaryPlay(device) != DS_OK)
1085 WARN("DSOUND_PrimaryPlay failed\n");
1086 else
1087 TRACE("starting playback\n");
1088 }
1089 }
1090 else
1091 LeaveCriticalSection(&(device->mixlock));
1092 } else {
1093 /* in the DSSCL_WRITEPRIMARY mode, the app is totally in charge... */
1094 if (device->state == STATE_STARTING) {
1095 if (DSOUND_PrimaryPlay(device) != DS_OK)
1096 WARN("DSOUND_PrimaryPlay failed\n");
1097 else
1098 device->state = STATE_PLAYING;
1099 }
1100 else if (device->state == STATE_STOPPING) {
1101 if (DSOUND_PrimaryStop(device) != DS_OK)
1102 WARN("DSOUND_PrimaryStop failed\n");
1103 else
1104 device->state = STATE_STOPPED;
1105 }
1106 }
1107 }
1108
1109 void CALLBACK DSOUND_timer(UINT timerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1110 {
1111 DirectSoundDevice * device = (DirectSoundDevice*)dwUser;
1112 DWORD start_time = GetTickCount();
1113 DWORD end_time;
1114 TRACE("(%d,%d,0x%lx,0x%lx,0x%lx)\n",timerID,msg,dwUser,dw1,dw2);
1115 TRACE("entering at %ld\n", start_time);
1116
1117 if (DSOUND_renderer[device->drvdesc.dnDevNode] != device) {
1118 ERR("dsound died without killing us?\n");
1119 timeKillEvent(timerID);
1120 timeEndPeriod(DS_TIME_RES);
1121 return;
1122 }
1123
1124 RtlAcquireResourceShared(&(device->buffer_list_lock), TRUE);
1125
1126 if (device->ref)
1127 DSOUND_PerformMix(device);
1128
1129 RtlReleaseResource(&(device->buffer_list_lock));
1130
1131 end_time = GetTickCount();
1132 TRACE("completed processing at %ld, duration = %ld\n", end_time, end_time - start_time);
1133 }
1134
1135 void CALLBACK DSOUND_callback(HWAVEOUT hwo, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1136 {
1137 DirectSoundDevice * device = (DirectSoundDevice*)dwUser;
1138 TRACE("(%p,%x,%lx,%lx,%lx)\n",hwo,msg,dwUser,dw1,dw2);
1139 TRACE("entering at %ld, msg=%08x(%s)\n", GetTickCount(), msg,
1140 msg==MM_WOM_DONE ? "MM_WOM_DONE" : msg==MM_WOM_CLOSE ? "MM_WOM_CLOSE" :
1141 msg==MM_WOM_OPEN ? "MM_WOM_OPEN" : "UNKNOWN");
1142 if (msg == MM_WOM_DONE) {
1143 DWORD inq, mixq, fraglen, buflen, pwplay, playpos, mixpos;
1144 if (device->pwqueue == (DWORD)-1) {
1145 TRACE("completed due to reset\n");
1146 return;
1147 }
1148 /* it could be a bad idea to enter critical section here... if there's lock contention,
1149 * the resulting scheduling delays might obstruct the winmm player thread */
1150 #ifdef SYNC_CALLBACK
1151 EnterCriticalSection(&(device->mixlock));
1152 #endif
1153 /* retrieve current values */
1154 fraglen = device->fraglen;
1155 buflen = device->buflen;
1156 pwplay = device->pwplay;
1157 playpos = pwplay * fraglen;
1158 mixpos = device->mixpos;
1159 /* check remaining mixed data */
1160 inq = ((mixpos < playpos) ? buflen : 0) + mixpos - playpos;
1161 mixq = inq / fraglen;
1162 if ((inq - (mixq * fraglen)) > 0) mixq++;
1163 /* complete the playing buffer */
1164 TRACE("done playing primary pos=%ld\n", playpos);
1165 pwplay++;
1166 if (pwplay >= DS_HEL_FRAGS) pwplay = 0;
1167 /* write new values */
1168 device->pwplay = pwplay;
1169 device->pwqueue--;
1170 /* queue new buffer if we have data for it */
1171 if (inq>1) DSOUND_WaveQueue(device, inq-1);
1172 #ifdef SYNC_CALLBACK
1173 LeaveCriticalSection(&(device->mixlock));
1174 #endif
1175 }
1176 TRACE("completed\n");
1177 }
GSOC 2012 project to enhance the control panel