git.oblomov.eu Git - wine/blob - dlls/dsound/mixer.c

   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 "config.h"
  23 #include <assert.h>
  24 #include <stdarg.h>
  25 #include <stdio.h>
  26 #include <sys/types.h>
  27 #include <sys/fcntl.h>
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <math.h>       /* Insomnia - pow() function */
  34
  35 #include "windef.h"
  36 #include "winbase.h"
  37 #include "wingdi.h"
  38 #include "winuser.h"
  39 #include "winerror.h"
  40 #include "mmsystem.h"
  41 #include "winreg.h"
  42 #include "winternl.h"
  43 #include "mmddk.h"
  44 #include "wine/windef16.h"
  45 #include "wine/debug.h"
  46 #include "dsound.h"
  47 #include "dsdriver.h"
  48 #include "dsound_private.h"
  49
  50 WINE_DEFAULT_DEBUG_CHANNEL(dsound);
  51
  52 void DSOUND_RecalcVolPan(PDSVOLUMEPAN volpan)
  53 {
  54         double temp;
  55         TRACE("(%p)\n",volpan);
  56
  57         TRACE("Vol=%ld Pan=%ld\n", volpan->lVolume, volpan->lPan);
  58         /* the AmpFactors are expressed in 16.16 fixed point */
  59         volpan->dwVolAmpFactor = (ULONG) (pow(2.0, volpan->lVolume / 600.0) * 0xffff);
  60         /* FIXME: dwPan{Left|Right}AmpFactor */
  61
  62         /* FIXME: use calculated vol and pan ampfactors */
  63         temp = (double) (volpan->lVolume - (volpan->lPan > 0 ? volpan->lPan : 0));
  64         volpan->dwTotalLeftAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 0xffff);
  65         temp = (double) (volpan->lVolume + (volpan->lPan < 0 ? volpan->lPan : 0));
  66         volpan->dwTotalRightAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 0xffff);
  67
  68         TRACE("left = %lx, right = %lx\n", volpan->dwTotalLeftAmpFactor, volpan->dwTotalRightAmpFactor);
  69 }
  70
  71 void DSOUND_AmpFactorToVolPan(PDSVOLUMEPAN volpan)
  72 {
  73     double left,right;
  74     TRACE("(%p)\n",volpan);
  75
  76     TRACE("left=%lx, right=%lx\n",volpan->dwTotalLeftAmpFactor,volpan->dwTotalRightAmpFactor);
  77     if (volpan->dwTotalLeftAmpFactor==0)
  78         left=-10000;
  79     else
  80         left=600 * log(((double)volpan->dwTotalLeftAmpFactor) / 0xffff) / log(2);
  81     if (volpan->dwTotalRightAmpFactor==0)
  82         right=-10000;
  83     else
  84         right=600 * log(((double)volpan->dwTotalRightAmpFactor) / 0xffff) / log(2);
  85     if (left<right)
  86     {
  87         volpan->lVolume=right;
  88         volpan->dwVolAmpFactor=volpan->dwTotalRightAmpFactor;
  89     }
  90     else
  91     {
  92         volpan->lVolume=left;
  93         volpan->dwVolAmpFactor=volpan->dwTotalLeftAmpFactor;
  94     }
  95     if (volpan->lVolume < -10000)
  96         volpan->lVolume=-10000;
  97     volpan->lPan=right-left;
  98     if (volpan->lPan < -10000)
  99         volpan->lPan=-10000;
 100
 101     TRACE("Vol=%ld Pan=%ld\n", volpan->lVolume, volpan->lPan);
 102 }
 103
 104 void DSOUND_RecalcFormat(IDirectSoundBufferImpl *dsb)
 105 {
 106         DWORD sw;
 107         TRACE("(%p)\n",dsb);
 108
 109         sw = dsb->wfx.nChannels * (dsb->wfx.wBitsPerSample / 8);
 110         /* calculate the 10ms write lead */
 111         dsb->writelead = (dsb->freq / 100) * sw;
 112 }
 113
 114 void DSOUND_CheckEvent(IDirectSoundBufferImpl *dsb, int len)
 115 {
 116         int                     i;
 117         DWORD                   offset;
 118         LPDSBPOSITIONNOTIFY     event;
 119         TRACE("(%p,%d)\n",dsb,len);
 120
 121         if (dsb->nrofnotifies == 0)
 122                 return;
 123
 124         TRACE("(%p) buflen = %ld, playpos = %ld, len = %d\n",
 125                 dsb, dsb->buflen, dsb->playpos, len);
 126         for (i = 0; i < dsb->nrofnotifies ; i++) {
 127                 event = dsb->notifies + i;
 128                 offset = event->dwOffset;
 129                 TRACE("checking %d, position %ld, event = %p\n",
 130                         i, offset, event->hEventNotify);
 131                 /* DSBPN_OFFSETSTOP has to be the last element. So this is */
 132                 /* OK. [Inside DirectX, p274] */
 133                 /*  */
 134                 /* This also means we can't sort the entries by offset, */
 135                 /* because DSBPN_OFFSETSTOP == -1 */
 136                 if (offset == DSBPN_OFFSETSTOP) {
 137                         if (dsb->state == STATE_STOPPED) {
 138                                 SetEvent(event->hEventNotify);
 139                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 140                                 return;
 141                         } else
 142                                 return;
 143                 }
 144                 if ((dsb->playpos + len) >= dsb->buflen) {
 145                         if ((offset < ((dsb->playpos + len) % dsb->buflen)) ||
 146                             (offset >= dsb->playpos)) {
 147                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 148                                 SetEvent(event->hEventNotify);
 149                         }
 150                 } else {
 151                         if ((offset >= dsb->playpos) && (offset < (dsb->playpos + len))) {
 152                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 153                                 SetEvent(event->hEventNotify);
 154                         }
 155                 }
 156         }
 157 }
 158
 159 /* WAV format info can be found at:
 160  *
 161  *    http://www.cwi.nl/ftp/audio/AudioFormats.part2
 162  *    ftp://ftp.cwi.nl/pub/audio/RIFF-format
 163  *
 164  * Import points to remember:
 165  *    8-bit WAV is unsigned
 166  *    16-bit WAV is signed
 167  */
 168  /* Use the same formulas as pcmconverter.c */
 169 static inline INT16 cvtU8toS16(BYTE b)
 170 {
 171     return (short)((b+(b << 8))-32768);
 172 }
 173
 174 static inline BYTE cvtS16toU8(INT16 s)
 175 {
 176     return (s >> 8) ^ (unsigned char)0x80;
 177 }
 178
 179 static inline void cp_fields(const IDirectSoundBufferImpl *dsb, BYTE *ibuf, BYTE *obuf )
 180 {
 181         INT fl,fr;
 182
 183         if (dsb->wfx.wBitsPerSample == 8)  {
 184                 if (dsb->dsound->wfx.wBitsPerSample == 8 &&
 185                     dsb->dsound->wfx.nChannels == dsb->wfx.nChannels) {
 186                         /* avoid needless 8->16->8 conversion */
 187                         *obuf=*ibuf;
 188                         if (dsb->wfx.nChannels==2)
 189                                 *(obuf+1)=*(ibuf+1);
 190                         return;
 191                 }
 192                 fl = cvtU8toS16(*ibuf);
 193                 fr = (dsb->wfx.nChannels==2 ? cvtU8toS16(*(ibuf + 1)) : fl);
 194         } else {
 195                 fl = *((INT16 *)ibuf);
 196                 fr = (dsb->wfx.nChannels==2 ? *(((INT16 *)ibuf) + 1)  : fl);
 197         }
 198
 199         if (dsb->dsound->wfx.nChannels == 2) {
 200                 if (dsb->dsound->wfx.wBitsPerSample == 8) {
 201                         *obuf = cvtS16toU8(fl);
 202                         *(obuf + 1) = cvtS16toU8(fr);
 203                         return;
 204                 }
 205                 if (dsb->dsound->wfx.wBitsPerSample == 16) {
 206                         *((INT16 *)obuf) = fl;
 207                         *(((INT16 *)obuf) + 1) = fr;
 208                         return;
 209                 }
 210         }
 211         if (dsb->dsound->wfx.nChannels == 1) {
 212                 fl = (fl + fr) >> 1;
 213                 if (dsb->dsound->wfx.wBitsPerSample == 8) {
 214                         *obuf = cvtS16toU8(fl);
 215                         return;
 216                 }
 217                 if (dsb->dsound->wfx.wBitsPerSample == 16) {
 218                         *((INT16 *)obuf) = fl;
 219                         return;
 220                 }
 221         }
 222 }
 223
 224 /* Now with PerfectPitch (tm) technology */
 225 static INT DSOUND_MixerNorm(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
 226 {
 227         INT     i, size, ipos, ilen;
 228         BYTE    *ibp, *obp;
 229         INT     iAdvance = dsb->wfx.nBlockAlign;
 230         INT     oAdvance = dsb->dsound->wfx.nBlockAlign;
 231
 232         ibp = dsb->buffer->memory + dsb->buf_mixpos;
 233         obp = buf;
 234
 235         TRACE("(%p, %p, %p), buf_mixpos=%ld\n", dsb, ibp, obp, dsb->buf_mixpos);
 236         /* Check for the best case */
 237         if ((dsb->freq == dsb->dsound->wfx.nSamplesPerSec) &&
 238             (dsb->wfx.wBitsPerSample == dsb->dsound->wfx.wBitsPerSample) &&
 239             (dsb->wfx.nChannels == dsb->dsound->wfx.nChannels)) {
 240                 DWORD bytesleft = dsb->buflen - dsb->buf_mixpos;
 241                 TRACE("(%p) Best case\n", dsb);
 242                 if (len <= bytesleft )
 243                         memcpy(obp, ibp, len);
 244                 else { /* wrap */
 245                         memcpy(obp, ibp, bytesleft );
 246                         memcpy(obp + bytesleft, dsb->buffer->memory, len - bytesleft);
 247                 }
 248                 return len;
 249         }
 250
 251         /* Check for same sample rate */
 252         if (dsb->freq == dsb->dsound->wfx.nSamplesPerSec) {
 253                 TRACE("(%p) Same sample rate %ld = primary %ld\n", dsb,
 254                         dsb->freq, dsb->dsound->wfx.nSamplesPerSec);
 255                 ilen = 0;
 256                 for (i = 0; i < len; i += oAdvance) {
 257                         cp_fields(dsb, ibp, obp );
 258                         ibp += iAdvance;
 259                         ilen += iAdvance;
 260                         obp += oAdvance;
 261                         if (ibp >= (BYTE *)(dsb->buffer->memory + dsb->buflen))
 262                                 ibp = dsb->buffer->memory;      /* wrap */
 263                 }
 264                 return (ilen);
 265         }
 266
 267         /* Mix in different sample rates */
 268         /* */
 269         /* New PerfectPitch(tm) Technology (c) 1998 Rob Riggs */
 270         /* Patent Pending :-] */
 271
 272         /* Patent enhancements (c) 2000 Ove Kåven,
 273          * TransGaming Technologies Inc. */
 274
 275         /* FIXME("(%p) Adjusting frequency: %ld -> %ld (need optimization)\n",
 276            dsb, dsb->freq, dsb->dsound->wfx.nSamplesPerSec); */
 277
 278         size = len / oAdvance;
 279         ilen = 0;
 280         ipos = dsb->buf_mixpos;
 281         for (i = 0; i < size; i++) {
 282                 cp_fields(dsb, (dsb->buffer->memory + ipos), obp);
 283                 obp += oAdvance;
 284                 dsb->freqAcc += dsb->freqAdjust;
 285                 if (dsb->freqAcc >= (1<<DSOUND_FREQSHIFT)) {
 286                         ULONG adv = (dsb->freqAcc>>DSOUND_FREQSHIFT) * iAdvance;
 287                         dsb->freqAcc &= (1<<DSOUND_FREQSHIFT)-1;
 288                         ipos += adv; ilen += adv;
 289                         while (ipos >= dsb->buflen)
 290                                 ipos -= dsb->buflen;
 291                 }
 292         }
 293         return ilen;
 294 }
 295
 296 static void DSOUND_MixerVol(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
 297 {
 298         INT     i;
 299         BYTE    *bpc = buf;
 300         INT16   *bps = (INT16 *) buf;
 301
 302         TRACE("(%p,%p,%d)\n",dsb,buf,len);
 303         TRACE("left = %lx, right = %lx\n", dsb->cvolpan.dwTotalLeftAmpFactor,
 304                 dsb->cvolpan.dwTotalRightAmpFactor);
 305
 306         if ((!(dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) || (dsb->cvolpan.lPan == 0)) &&
 307             (!(dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) || (dsb->cvolpan.lVolume == 0)) &&
 308             !(dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 309                 return;         /* Nothing to do */
 310
 311         /* If we end up with some bozo coder using panning or 3D sound */
 312         /* with a mono primary buffer, it could sound very weird using */
 313         /* this method. Oh well, tough patooties. */
 314
 315         switch (dsb->dsound->wfx.wBitsPerSample) {
 316         case 8:
 317                 /* 8-bit WAV is unsigned, but we need to operate */
 318                 /* on signed data for this to work properly */
 319                 switch (dsb->dsound->wfx.nChannels) {
 320                 case 1:
 321                         for (i = 0; i < len; i++) {
 322                                 INT val = *bpc - 128;
 323                                 val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 324                                 *bpc = val + 128;
 325                                 bpc++;
 326                         }
 327                         break;
 328                 case 2:
 329                         for (i = 0; i < len; i+=2) {
 330                                 INT val = *bpc - 128;
 331                                 val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 332                                 *bpc++ = val + 128;
 333                                 val = *bpc - 128;
 334                                 val = (val * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
 335                                 *bpc = val + 128;
 336                                 bpc++;
 337                         }
 338                         break;
 339                 default:
 340                         FIXME("doesn't support %d channels\n", dsb->dsound->wfx.nChannels);
 341                         break;
 342                 }
 343                 break;
 344         case 16:
 345                 /* 16-bit WAV is signed -- much better */
 346                 switch (dsb->dsound->wfx.nChannels) {
 347                 case 1:
 348                         for (i = 0; i < len; i += 2) {
 349                                 *bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 350                                 bps++;
 351                         }
 352                         break;
 353                 case 2:
 354                         for (i = 0; i < len; i += 4) {
 355                                 *bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 356                                 bps++;
 357                                 *bps = (*bps * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
 358                                 bps++;
 359                         }
 360                         break;
 361                 default:
 362                         FIXME("doesn't support %d channels\n", dsb->dsound->wfx.nChannels);
 363                         break;
 364                 }
 365                 break;
 366         default:
 367                 FIXME("doesn't support %d bit samples\n", dsb->dsound->wfx.wBitsPerSample);
 368                 break;
 369         }
 370 }
 371
 372 static void *tmp_buffer;
 373 static size_t tmp_buffer_len = 0;
 374
 375 static void *DSOUND_tmpbuffer(size_t len)
 376 {
 377   if (len>tmp_buffer_len) {
 378     void *new_buffer = realloc(tmp_buffer, len);
 379     if (new_buffer) {
 380       tmp_buffer = new_buffer;
 381       tmp_buffer_len = len;
 382     }
 383     return new_buffer;
 384   }
 385   return tmp_buffer;
 386 }
 387
 388 static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD fraglen)
 389 {
 390         INT     i, len, ilen, temp, field, nBlockAlign, todo;
 391         BYTE    *buf, *ibuf;
 392
 393         TRACE("(%p,%ld,%ld)\n",dsb,writepos,fraglen);
 394
 395         len = fraglen;
 396         if (!(dsb->playflags & DSBPLAY_LOOPING)) {
 397                 temp = MulDiv(dsb->dsound->wfx.nAvgBytesPerSec, dsb->buflen,
 398                         dsb->nAvgBytesPerSec) -
 399                        MulDiv(dsb->dsound->wfx.nAvgBytesPerSec, dsb->buf_mixpos,
 400                         dsb->nAvgBytesPerSec);
 401                 len = (len > temp) ? temp : len;
 402         }
 403         nBlockAlign = dsb->dsound->wfx.nBlockAlign;
 404         len = len / nBlockAlign * nBlockAlign;  /* data alignment */
 405
 406         if (len == 0) {
 407                 /* This should only happen if we aren't looping and temp < nBlockAlign */
 408                 return 0;
 409         }
 410
 411         /* Been seeing segfaults in malloc() for some reason... */
 412         TRACE("allocating buffer (size = %d)\n", len);
 413         if ((buf = ibuf = (BYTE *) DSOUND_tmpbuffer(len)) == NULL)
 414                 return 0;
 415
 416         TRACE("MixInBuffer (%p) len = %d, dest = %ld\n", dsb, len, writepos);
 417
 418         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 419         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 420             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 421             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 422                 DSOUND_MixerVol(dsb, ibuf, len);
 423
 424         if (dsb->dsound->wfx.wBitsPerSample == 8) {
 425                 BYTE    *obuf = dsb->dsound->buffer + writepos;
 426
 427                 if ((writepos + len) <= dsb->dsound->buflen)
 428                         todo = len;
 429                 else
 430                         todo = dsb->dsound->buflen - writepos;
 431
 432                 for (i = 0; i < todo; i++) {
 433                         /* 8-bit WAV is unsigned */
 434                         field = (*ibuf++ - 128);
 435                         field += (*obuf - 128);
 436                         if (field > 127) field = 127;
 437                         else if (field < -128) field = -128;
 438                         *obuf++ = field + 128;
 439                 }
 440
 441                 if (todo < len) {
 442                         todo = len - todo;
 443                         obuf = dsb->dsound->buffer;
 444
 445                         for (i = 0; i < todo; i++) {
 446                                 /* 8-bit WAV is unsigned */
 447                                 field = (*ibuf++ - 128);
 448                                 field += (*obuf - 128);
 449                                 if (field > 127) field = 127;
 450                                 else if (field < -128) field = -128;
 451                                 *obuf++ = field + 128;
 452                         }
 453                 }
 454         } else {
 455                 INT16   *ibufs, *obufs;
 456
 457                 ibufs = (INT16 *) ibuf;
 458                 obufs = (INT16 *)(dsb->dsound->buffer + writepos);
 459
 460                 if ((writepos + len) <= dsb->dsound->buflen)
 461                         todo = len / 2;
 462                 else
 463                         todo = (dsb->dsound->buflen - writepos) / 2;
 464
 465                 for (i = 0; i < todo; i++) {
 466                         /* 16-bit WAV is signed */
 467                         field = *ibufs++;
 468                         field += *obufs;
 469                         if (field > 32767) field = 32767;
 470                         else if (field < -32768) field = -32768;
 471                         *obufs++ = field;
 472                 }
 473
 474                 if (todo < (len / 2)) {
 475                         todo = (len / 2) - todo;
 476                         obufs = (INT16 *)dsb->dsound->buffer;
 477
 478                         for (i = 0; i < todo; i++) {
 479                                 /* 16-bit WAV is signed */
 480                                 field = *ibufs++;
 481                                 field += *obufs;
 482                                 if (field > 32767) field = 32767;
 483                                 else if (field < -32768) field = -32768;
 484                                 *obufs++ = field;
 485                         }
 486                 }
 487         }
 488
 489         if (dsb->leadin && (dsb->startpos > dsb->buf_mixpos) && (dsb->startpos <= dsb->buf_mixpos + ilen)) {
 490                 /* HACK... leadin should be reset when the PLAY position reaches the startpos,
 491                  * not the MIX position... but if the sound buffer is bigger than our prebuffering
 492                  * (which must be the case for the streaming buffers that need this hack anyway)
 493                  * plus DS_HEL_MARGIN or equivalent, then this ought to work anyway. */
 494                 dsb->leadin = FALSE;
 495         }
 496
 497         dsb->buf_mixpos += ilen;
 498
 499         if (dsb->buf_mixpos >= dsb->buflen) {
 500                 if (dsb->playflags & DSBPLAY_LOOPING) {
 501                         /* wrap */
 502                         while (dsb->buf_mixpos >= dsb->buflen)
 503                                 dsb->buf_mixpos -= dsb->buflen;
 504                         if (dsb->leadin && (dsb->startpos <= dsb->buf_mixpos))
 505                                 dsb->leadin = FALSE; /* HACK: see above */
 506                 }
 507         }
 508
 509         return len;
 510 }
 511
 512 static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD len)
 513 {
 514         INT     i, ilen, field, nBlockAlign, todo;
 515         BYTE    *buf, *ibuf;
 516
 517         TRACE("(%p,%ld,%ld)\n",dsb,writepos,len);
 518
 519         nBlockAlign = dsb->dsound->wfx.nBlockAlign;
 520         len = len / nBlockAlign * nBlockAlign;  /* data alignment */
 521
 522         TRACE("allocating buffer (size = %ld)\n", len);
 523         if ((buf = ibuf = (BYTE *) DSOUND_tmpbuffer(len)) == NULL)
 524                 return;
 525
 526         TRACE("PhaseCancel (%p) len = %ld, dest = %ld\n", dsb, len, writepos);
 527
 528         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 529         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 530             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 531             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 532                 DSOUND_MixerVol(dsb, ibuf, len);
 533
 534         /* subtract instead of add, to phase out premixed data */
 535         if (dsb->dsound->wfx.wBitsPerSample == 8) {
 536                 BYTE    *obuf = dsb->dsound->buffer + writepos;
 537
 538                 if ((writepos + len) <= dsb->dsound->buflen)
 539                         todo = len;
 540                 else
 541                         todo = dsb->dsound->buflen - writepos;
 542
 543                 for (i = 0; i < todo; i++) {
 544                         /* 8-bit WAV is unsigned */
 545                         field = (*ibuf++ - 128);
 546                         field -= (*obuf - 128);
 547                         if (field > 127) field = 127;
 548                         else if (field < -128) field = -128;
 549                         *obuf++ = field + 128;
 550                 }
 551
 552                 if (todo < len) {
 553                         todo = len - todo;
 554                         obuf = dsb->dsound->buffer;
 555
 556                         for (i = 0; i < todo; i++) {
 557                                 /* 8-bit WAV is unsigned */
 558                                 field = (*ibuf++ - 128);
 559                                 field -= (*obuf - 128);
 560                                 if (field > 127) field = 127;
 561                                 else if (field < -128) field = -128;
 562                                 *obuf++ = field + 128;
 563                         }
 564                 }
 565         } else {
 566                 INT16   *ibufs, *obufs;
 567
 568                 ibufs = (INT16 *) ibuf;
 569                 obufs = (INT16 *)(dsb->dsound->buffer + writepos);
 570
 571                 if ((writepos + len) <= dsb->dsound->buflen)
 572                         todo = len / 2;
 573                 else
 574                         todo = (dsb->dsound->buflen - writepos) / 2;
 575
 576                 for (i = 0; i < todo; i++) {
 577                         /* 16-bit WAV is signed */
 578                         field = *ibufs++;
 579                         field -= *obufs;
 580                         if (field > 32767) field = 32767;
 581                         else if (field < -32768) field = -32768;
 582                         *obufs++ = field;
 583                 }
 584
 585                 if (todo < (len / 2)) {
 586                         todo = (len / 2) - todo;
 587                         obufs = (INT16 *)dsb->dsound->buffer;
 588
 589                         for (i = 0; i < todo; i++) {
 590                                 /* 16-bit WAV is signed */
 591                                 field = *ibufs++;
 592                                 field -= *obufs;
 593                                 if (field > 32767) field = 32767;
 594                                 else if (field < -32768) field = -32768;
 595                                 *obufs++ = field;
 596                         }
 597                 }
 598         }
 599 }
 600
 601 static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)
 602 {
 603         DWORD   size, flen, len, npos, nlen;
 604         INT     iAdvance = dsb->wfx.nBlockAlign;
 605         INT     oAdvance = dsb->dsound->wfx.nBlockAlign;
 606         /* determine amount of premixed data to cancel */
 607         DWORD primary_done =
 608                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
 609                 dsb->primary_mixpos - writepos;
 610
 611         TRACE("(%p, %ld), buf_mixpos=%ld\n", dsb, writepos, dsb->buf_mixpos);
 612
 613         /* backtrack the mix position */
 614         size = primary_done / oAdvance;
 615         flen = size * dsb->freqAdjust;
 616         len = (flen >> DSOUND_FREQSHIFT) * iAdvance;
 617         flen &= (1<<DSOUND_FREQSHIFT)-1;
 618         while (dsb->freqAcc < flen) {
 619                 len += iAdvance;
 620                 dsb->freqAcc += 1<<DSOUND_FREQSHIFT;
 621         }
 622         len %= dsb->buflen;
 623         npos = ((dsb->buf_mixpos < len) ? dsb->buflen : 0) +
 624                 dsb->buf_mixpos - len;
 625         if (dsb->leadin && (dsb->startpos > npos) && (dsb->startpos <= npos + len)) {
 626                 /* stop backtracking at startpos */
 627                 npos = dsb->startpos;
 628                 len = ((dsb->buf_mixpos < npos) ? dsb->buflen : 0) +
 629                         dsb->buf_mixpos - npos;
 630                 flen = dsb->freqAcc;
 631                 nlen = len / dsb->wfx.nBlockAlign;
 632                 nlen = ((nlen << DSOUND_FREQSHIFT) + flen) / dsb->freqAdjust;
 633                 nlen *= dsb->dsound->wfx.nBlockAlign;
 634                 writepos =
 635                         ((dsb->primary_mixpos < nlen) ? dsb->dsound->buflen : 0) +
 636                         dsb->primary_mixpos - nlen;
 637         }
 638
 639         dsb->freqAcc -= flen;
 640         dsb->buf_mixpos = npos;
 641         dsb->primary_mixpos = writepos;
 642
 643         TRACE("new buf_mixpos=%ld, primary_mixpos=%ld (len=%ld)\n",
 644               dsb->buf_mixpos, dsb->primary_mixpos, len);
 645
 646         if (cancel) DSOUND_PhaseCancel(dsb, writepos, len);
 647 }
 648
 649 void DSOUND_MixCancelAt(IDirectSoundBufferImpl *dsb, DWORD buf_writepos)
 650 {
 651 #if 0
 652         DWORD   i, size, flen, len, npos, nlen;
 653         INT     iAdvance = dsb->wfx.nBlockAlign;
 654         INT     oAdvance = dsb->dsound->wfx.nBlockAlign;
 655         /* determine amount of premixed data to cancel */
 656         DWORD buf_done =
 657                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 658                 dsb->buf_mixpos - buf_writepos;
 659 #endif
 660
 661         WARN("(%p, %ld), buf_mixpos=%ld\n", dsb, buf_writepos, dsb->buf_mixpos);
 662         /* since this is not implemented yet, just cancel *ALL* prebuffering for now
 663          * (which is faster anyway when there's only a single secondary buffer) */
 664         dsb->dsound->need_remix = TRUE;
 665 }
 666
 667 void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
 668 {
 669         TRACE("(%p)\n",dsb);
 670         EnterCriticalSection(&dsb->lock);
 671         if (dsb->state == STATE_PLAYING) {
 672 #if 0 /* this may not be quite reliable yet */
 673                 dsb->need_remix = TRUE;
 674 #else
 675                 dsb->dsound->need_remix = TRUE;
 676 #endif
 677         }
 678         LeaveCriticalSection(&dsb->lock);
 679 }
 680
 681 static DWORD DSOUND_MixOne(IDirectSoundBufferImpl *dsb, DWORD playpos, DWORD writepos, DWORD mixlen)
 682 {
 683         DWORD len, slen;
 684         /* determine this buffer's write position */
 685         DWORD buf_writepos = DSOUND_CalcPlayPosition(dsb, dsb->state & dsb->dsound->state, writepos,
 686                                                      writepos, dsb->primary_mixpos, dsb->buf_mixpos);
 687         /* determine how much already-mixed data exists */
 688         DWORD buf_done =
 689                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 690                 dsb->buf_mixpos - buf_writepos;
 691         DWORD primary_done =
 692                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
 693                 dsb->primary_mixpos - writepos;
 694         DWORD adv_done =
 695                 ((dsb->dsound->mixpos < writepos) ? dsb->dsound->buflen : 0) +
 696                 dsb->dsound->mixpos - writepos;
 697         DWORD played =
 698                 ((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
 699                 buf_writepos - dsb->playpos;
 700         DWORD buf_left = dsb->buflen - buf_writepos;
 701         int still_behind;
 702
 703         TRACE("(%p,%ld,%ld,%ld)\n",dsb,playpos,writepos,mixlen);
 704         TRACE("buf_writepos=%ld, primary_writepos=%ld\n", buf_writepos, writepos);
 705         TRACE("buf_done=%ld, primary_done=%ld\n", buf_done, primary_done);
 706         TRACE("buf_mixpos=%ld, primary_mixpos=%ld, mixlen=%ld\n", dsb->buf_mixpos, dsb->primary_mixpos,
 707               mixlen);
 708         TRACE("looping=%ld, startpos=%ld, leadin=%ld\n", dsb->playflags, dsb->startpos, dsb->leadin);
 709
 710         /* check for notification positions */
 711         if (dsb->dsbd.dwFlags & DSBCAPS_CTRLPOSITIONNOTIFY &&
 712             dsb->state != STATE_STARTING) {
 713                 DSOUND_CheckEvent(dsb, played);
 714         }
 715
 716         /* save write position for non-GETCURRENTPOSITION2... */
 717         dsb->playpos = buf_writepos;
 718
 719         /* check whether CalcPlayPosition detected a mixing underrun */
 720         if ((buf_done == 0) && (dsb->primary_mixpos != writepos)) {
 721                 /* it did, but did we have more to play? */
 722                 if ((dsb->playflags & DSBPLAY_LOOPING) ||
 723                     (dsb->buf_mixpos < dsb->buflen)) {
 724                         /* yes, have to recover */
 725                         ERR("underrun on sound buffer %p\n", dsb);
 726                         TRACE("recovering from underrun: primary_mixpos=%ld\n", writepos);
 727                 }
 728                 dsb->primary_mixpos = writepos;
 729                 primary_done = 0;
 730         }
 731         /* determine how far ahead we should mix */
 732         if (((dsb->playflags & DSBPLAY_LOOPING) ||
 733              (dsb->leadin && (dsb->probably_valid_to != 0))) &&
 734             !(dsb->dsbd.dwFlags & DSBCAPS_STATIC)) {
 735                 /* if this is a streaming buffer, it typically means that
 736                  * we should defer mixing past probably_valid_to as long
 737                  * as we can, to avoid unnecessary remixing */
 738                 /* the heavy-looking calculations shouldn't be that bad,
 739                  * as any game isn't likely to be have more than 1 or 2
 740                  * streaming buffers in use at any time anyway... */
 741                 DWORD probably_valid_left =
 742                         (dsb->probably_valid_to == (DWORD)-1) ? dsb->buflen :
 743                         ((dsb->probably_valid_to < buf_writepos) ? dsb->buflen : 0) +
 744                         dsb->probably_valid_to - buf_writepos;
 745                 /* check for leadin condition */
 746                 if ((probably_valid_left == 0) &&
 747                     (dsb->probably_valid_to == dsb->startpos) &&
 748                     dsb->leadin)
 749                         probably_valid_left = dsb->buflen;
 750                 TRACE("streaming buffer probably_valid_to=%ld, probably_valid_left=%ld\n",
 751                       dsb->probably_valid_to, probably_valid_left);
 752                 /* check whether the app's time is already up */
 753                 if (probably_valid_left < dsb->writelead) {
 754                         WARN("probably_valid_to now within writelead, possible streaming underrun\n");
 755                         /* once we pass the point of no return,
 756                          * no reason to hold back anymore */
 757                         dsb->probably_valid_to = (DWORD)-1;
 758                         /* we just have to go ahead and mix what we have,
 759                          * there's no telling what the app is thinking anyway */
 760                 } else {
 761                         /* adjust for our frequency and our sample size */
 762                         probably_valid_left = MulDiv(probably_valid_left,
 763                                                      1 << DSOUND_FREQSHIFT,
 764                                                      dsb->wfx.nBlockAlign * dsb->freqAdjust) *
 765                                               dsb->dsound->wfx.nBlockAlign;
 766                         /* check whether to clip mix_len */
 767                         if (probably_valid_left < mixlen) {
 768                                 TRACE("clipping to probably_valid_left=%ld\n", probably_valid_left);
 769                                 mixlen = probably_valid_left;
 770                         }
 771                 }
 772         }
 773         /* cut mixlen with what's already been mixed */
 774         if (mixlen < primary_done) {
 775                 /* huh? and still CalcPlayPosition didn't
 776                  * detect an underrun? */
 777                 FIXME("problem with underrun detection (mixlen=%ld < primary_done=%ld)\n", mixlen, primary_done);
 778                 return 0;
 779         }
 780         len = mixlen - primary_done;
 781         TRACE("remaining mixlen=%ld\n", len);
 782
 783         if (len < dsb->dsound->fraglen) {
 784                 /* smaller than a fragment, wait until it gets larger
 785                  * before we take the mixing overhead */
 786                 TRACE("mixlen not worth it, deferring mixing\n");
 787                 still_behind = 1;
 788                 goto post_mix;
 789         }
 790
 791         /* ok, we know how much to mix, let's go */
 792         still_behind = (adv_done > primary_done);
 793         while (len) {
 794                 slen = dsb->dsound->buflen - dsb->primary_mixpos;
 795                 if (slen > len) slen = len;
 796                 slen = DSOUND_MixInBuffer(dsb, dsb->primary_mixpos, slen);
 797
 798                 if ((dsb->primary_mixpos < dsb->dsound->mixpos) &&
 799                     (dsb->primary_mixpos + slen >= dsb->dsound->mixpos))
 800                         still_behind = FALSE;
 801
 802                 dsb->primary_mixpos += slen; len -= slen;
 803                 while (dsb->primary_mixpos >= dsb->dsound->buflen)
 804                         dsb->primary_mixpos -= dsb->dsound->buflen;
 805
 806                 if ((dsb->state == STATE_STOPPED) || !slen) break;
 807         }
 808         TRACE("new primary_mixpos=%ld, primary_advbase=%ld\n", dsb->primary_mixpos, dsb->dsound->mixpos);
 809         TRACE("mixed data len=%ld, still_behind=%d\n", mixlen-len, still_behind);
 810
 811 post_mix:
 812         /* check if buffer should be considered complete */
 813         if (buf_left < dsb->writelead &&
 814             !(dsb->playflags & DSBPLAY_LOOPING)) {
 815                 dsb->state = STATE_STOPPED;
 816                 dsb->playpos = 0;
 817                 dsb->last_playpos = 0;
 818                 dsb->buf_mixpos = 0;
 819                 dsb->leadin = FALSE;
 820                 DSOUND_CheckEvent(dsb, buf_left);
 821         }
 822
 823         /* return how far we think the primary buffer can
 824          * advance its underrun detector...*/
 825         if (still_behind) return 0;
 826         if ((mixlen - len) < primary_done) return 0;
 827         slen = ((dsb->primary_mixpos < dsb->dsound->mixpos) ?
 828                 dsb->dsound->buflen : 0) + dsb->primary_mixpos -
 829                 dsb->dsound->mixpos;
 830         if (slen > mixlen) {
 831                 /* the primary_done and still_behind checks above should have worked */
 832                 FIXME("problem with advancement calculation (advlen=%ld > mixlen=%ld)\n", slen, mixlen);
 833                 slen = 0;
 834         }
 835         return slen;
 836 }
 837
 838 static DWORD DSOUND_MixToPrimary(IDirectSoundImpl *dsound, DWORD playpos, DWORD writepos, DWORD mixlen, BOOL recover)
 839 {
 840         INT                     i, len, maxlen = 0;
 841         IDirectSoundBufferImpl  *dsb;
 842
 843         TRACE("(%ld,%ld,%ld,%d)\n", playpos, writepos, mixlen, recover);
 844         for (i = dsound->nrofbuffers - 1; i >= 0; i--) {
 845                 dsb = dsound->buffers[i];
 846
 847                 if (!dsb || !dsb->lpVtbl)
 848                         continue;
 849                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 850                         TRACE("Checking %p, mixlen=%ld\n", dsb, mixlen);
 851                         EnterCriticalSection(&(dsb->lock));
 852                         if (dsb->state == STATE_STOPPING) {
 853                                 DSOUND_MixCancel(dsb, writepos, TRUE);
 854                                 dsb->state = STATE_STOPPED;
 855                                 DSOUND_CheckEvent(dsb, 0);
 856                         } else {
 857                                 if ((dsb->state == STATE_STARTING) || recover) {
 858                                         dsb->primary_mixpos = writepos;
 859                                         memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
 860                                         dsb->need_remix = FALSE;
 861                                 }
 862                                 else if (dsb->need_remix) {
 863                                         DSOUND_MixCancel(dsb, writepos, TRUE);
 864                                         memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
 865                                         dsb->need_remix = FALSE;
 866                                 }
 867                                 len = DSOUND_MixOne(dsb, playpos, writepos, mixlen);
 868                                 if (dsb->state == STATE_STARTING)
 869                                         dsb->state = STATE_PLAYING;
 870                                 maxlen = (len > maxlen) ? len : maxlen;
 871                         }
 872                         LeaveCriticalSection(&(dsb->lock));
 873                 }
 874         }
 875
 876         return maxlen;
 877 }
 878
 879 static void DSOUND_MixReset(IDirectSoundImpl *dsound, DWORD writepos)
 880 {
 881         INT                     i;
 882         IDirectSoundBufferImpl  *dsb;
 883         int nfiller;
 884
 885         TRACE("(%ld)\n", writepos);
 886
 887         /* the sound of silence */
 888         nfiller = dsound->wfx.wBitsPerSample == 8 ? 128 : 0;
 889
 890         /* reset all buffer mix positions */
 891         for (i = dsound->nrofbuffers - 1; i >= 0; i--) {
 892                 dsb = dsound->buffers[i];
 893
 894                 if (!dsb || !dsb->lpVtbl)
 895                         continue;
 896                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 897                         TRACE("Resetting %p\n", dsb);
 898                         EnterCriticalSection(&(dsb->lock));
 899                         if (dsb->state == STATE_STOPPING) {
 900                                 dsb->state = STATE_STOPPED;
 901                         }
 902                         else if (dsb->state == STATE_STARTING) {
 903                                 /* nothing */
 904                         } else {
 905                                 DSOUND_MixCancel(dsb, writepos, FALSE);
 906                                 memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
 907                                 dsb->need_remix = FALSE;
 908                         }
 909                         LeaveCriticalSection(&(dsb->lock));
 910                 }
 911         }
 912
 913         /* wipe out premixed data */
 914         if (dsound->mixpos < writepos) {
 915                 memset(dsound->buffer + writepos, nfiller, dsound->buflen - writepos);
 916                 memset(dsound->buffer, nfiller, dsound->mixpos);
 917         } else {
 918                 memset(dsound->buffer + writepos, nfiller, dsound->mixpos - writepos);
 919         }
 920
 921         /* reset primary mix position */
 922         dsound->mixpos = writepos;
 923 }
 924
 925 static void DSOUND_CheckReset(IDirectSoundImpl *dsound, DWORD writepos)
 926 {
 927         TRACE("(%p,%ld)\n",dsound,writepos);
 928         if (dsound->need_remix) {
 929                 DSOUND_MixReset(dsound, writepos);
 930                 dsound->need_remix = FALSE;
 931                 /* maximize Half-Life performance */
 932                 dsound->prebuf = ds_snd_queue_min;
 933                 dsound->precount = 0;
 934         } else {
 935                 dsound->precount++;
 936                 if (dsound->precount >= 4) {
 937                         if (dsound->prebuf < ds_snd_queue_max)
 938                                 dsound->prebuf++;
 939                         dsound->precount = 0;
 940                 }
 941         }
 942         TRACE("premix adjust: %d\n", dsound->prebuf);
 943 }
 944
 945 void DSOUND_WaveQueue(IDirectSoundImpl *dsound, DWORD mixq)
 946 {
 947         TRACE("(%p,%ld)\n",dsound,mixq);
 948         if (mixq + dsound->pwqueue > ds_hel_queue) mixq = ds_hel_queue - dsound->pwqueue;
 949         TRACE("queueing %ld buffers, starting at %d\n", mixq, dsound->pwwrite);
 950         for (; mixq; mixq--) {
 951                 waveOutWrite(dsound->hwo, dsound->pwave[dsound->pwwrite], sizeof(WAVEHDR));
 952                 dsound->pwwrite++;
 953                 if (dsound->pwwrite >= DS_HEL_FRAGS) dsound->pwwrite = 0;
 954                 dsound->pwqueue++;
 955         }
 956 }
 957
 958 /* #define SYNC_CALLBACK */
 959
 960 void DSOUND_PerformMix(IDirectSoundImpl *dsound)
 961 {
 962         int nfiller;
 963         BOOL forced;
 964         HRESULT hres;
 965
 966         TRACE("()\n");
 967
 968         /* the sound of silence */
 969         nfiller = dsound->wfx.wBitsPerSample == 8 ? 128 : 0;
 970
 971         /* whether the primary is forced to play even without secondary buffers */
 972         forced = ((dsound->state == STATE_PLAYING) || (dsound->state == STATE_STARTING));
 973
 974         if (dsound->priolevel != DSSCL_WRITEPRIMARY) {
 975                 BOOL paused = ((dsound->state == STATE_STOPPED) || (dsound->state == STATE_STARTING));
 976                 /* FIXME: document variables */
 977                 DWORD playpos, writepos, inq, maxq, frag;
 978                 if (dsound->hwbuf) {
 979                         hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, &writepos);
 980                         if (hres) {
 981                             WARN("IDsDriverBuffer_GetPosition failed\n");
 982                             return;
 983                         }
 984                         /* Well, we *could* do Just-In-Time mixing using the writepos,
 985                          * but that's a little bit ambitious and unnecessary... */
 986                         /* rather add our safety margin to the writepos, if we're playing */
 987                         if (!paused) {
 988                                 writepos += dsound->writelead;
 989                                 while (writepos >= dsound->buflen)
 990                                         writepos -= dsound->buflen;
 991                         } else writepos = playpos;
 992                 } else {
 993                         playpos = dsound->pwplay * dsound->fraglen;
 994                         writepos = playpos;
 995                         if (!paused) {
 996                                 writepos += ds_hel_margin * dsound->fraglen;
 997                                 while (writepos >= dsound->buflen)
 998                                         writepos -= dsound->buflen;
 999                         }
1000                 }
1001                 TRACE("primary playpos=%ld, writepos=%ld, clrpos=%ld, mixpos=%ld, buflen=%ld\n",
1002                       playpos,writepos,dsound->playpos,dsound->mixpos,dsound->buflen);
1003                 assert(dsound->playpos < dsound->buflen);
1004                 /* wipe out just-played sound data */
1005                 if (playpos < dsound->playpos) {
1006                         memset(dsound->buffer + dsound->playpos, nfiller, dsound->buflen - dsound->playpos);
1007                         memset(dsound->buffer, nfiller, playpos);
1008                 } else {
1009                         memset(dsound->buffer + dsound->playpos, nfiller, playpos - dsound->playpos);
1010                 }
1011                 dsound->playpos = playpos;
1012
1013                 EnterCriticalSection(&(dsound->mixlock));
1014
1015                 /* reset mixing if necessary */
1016                 DSOUND_CheckReset(dsound, writepos);
1017
1018                 /* check how much prebuffering is left */
1019                 inq = dsound->mixpos;
1020                 if (inq < writepos)
1021                         inq += dsound->buflen;
1022                 inq -= writepos;
1023
1024                 /* find the maximum we can prebuffer */
1025                 if (!paused) {
1026                         maxq = playpos;
1027                         if (maxq < writepos)
1028                                 maxq += dsound->buflen;
1029                         maxq -= writepos;
1030                 } else maxq = dsound->buflen;
1031
1032                 /* clip maxq to dsound->prebuf */
1033                 frag = dsound->prebuf * dsound->fraglen;
1034                 if (maxq > frag) maxq = frag;
1035
1036                 /* check for consistency */
1037                 if (inq > maxq) {
1038                         /* the playback position must have passed our last
1039                          * mixed position, i.e. it's an underrun, or we have
1040                          * nothing more to play */
1041                         TRACE("reached end of mixed data (inq=%ld, maxq=%ld)\n", inq, maxq);
1042                         inq = 0;
1043                         /* stop the playback now, to allow buffers to refill */
1044                         if (dsound->state == STATE_PLAYING) {
1045                                 dsound->state = STATE_STARTING;
1046                         }
1047                         else if (dsound->state == STATE_STOPPING) {
1048                                 dsound->state = STATE_STOPPED;
1049                         }
1050                         else {
1051                                 /* how can we have an underrun if we aren't playing? */
1052                                 WARN("unexpected primary state (%ld)\n", dsound->state);
1053                         }
1054 #ifdef SYNC_CALLBACK
1055                         /* DSOUND_callback may need this lock */
1056                         LeaveCriticalSection(&(dsound->mixlock));
1057 #endif
1058                         if (DSOUND_PrimaryStop(dsound) != DS_OK)
1059                                 WARN("DSOUND_PrimaryStop failed\n");
1060 #ifdef SYNC_CALLBACK
1061                         EnterCriticalSection(&(dsound->mixlock));
1062 #endif
1063                         if (dsound->hwbuf) {
1064                                 /* the Stop is supposed to reset play position to beginning of buffer */
1065                                 /* unfortunately, OSS is not able to do so, so get current pointer */
1066                                 hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, NULL);
1067                                 if (hres) {
1068                                         LeaveCriticalSection(&(dsound->mixlock));
1069                                         WARN("IDsDriverBuffer_GetPosition failed\n");
1070                                         return;
1071                                 }
1072                         } else {
1073                                 playpos = dsound->pwplay * dsound->fraglen;
1074                         }
1075                         writepos = playpos;
1076                         dsound->playpos = playpos;
1077                         dsound->mixpos = writepos;
1078                         inq = 0;
1079                         maxq = dsound->buflen;
1080                         if (maxq > frag) maxq = frag;
1081                         memset(dsound->buffer, nfiller, dsound->buflen);
1082                         paused = TRUE;
1083                 }
1084
1085                 /* do the mixing */
1086                 frag = DSOUND_MixToPrimary(dsound, playpos, writepos, maxq, paused);
1087                 if (forced) frag = maxq - inq;
1088                 dsound->mixpos += frag;
1089                 while (dsound->mixpos >= dsound->buflen)
1090                         dsound->mixpos -= dsound->buflen;
1091
1092                 if (frag) {
1093                         /* buffers have been filled, restart playback */
1094                         if (dsound->state == STATE_STARTING) {
1095                                 dsound->state = STATE_PLAYING;
1096                         }
1097                         else if (dsound->state == STATE_STOPPED) {
1098                                 /* the dsound is supposed to play if there's something to play
1099                                  * even if it is reported as stopped, so don't let this confuse you */
1100                                 dsound->state = STATE_STOPPING;
1101                         }
1102                         LeaveCriticalSection(&(dsound->mixlock));
1103                         if (paused) {
1104                                 if (DSOUND_PrimaryPlay(dsound) != DS_OK)
1105                                         WARN("DSOUND_PrimaryPlay failed\n");
1106                                 else
1107                                         TRACE("starting playback\n");
1108                         }
1109                 }
1110                 else
1111                         LeaveCriticalSection(&(dsound->mixlock));
1112         } else {
1113                 /* in the DSSCL_WRITEPRIMARY mode, the app is totally in charge... */
1114                 if (dsound->state == STATE_STARTING) {
1115                         if (DSOUND_PrimaryPlay(dsound) != DS_OK)
1116                                 WARN("DSOUND_PrimaryPlay failed\n");
1117                         else
1118                                 dsound->state = STATE_PLAYING;
1119                 }
1120                 else if (dsound->state == STATE_STOPPING) {
1121                         if (DSOUND_PrimaryStop(dsound) != DS_OK)
1122                                 WARN("DSOUND_PrimaryStop failed\n");
1123                         else
1124                                 dsound->state = STATE_STOPPED;
1125                 }
1126         }
1127 }
1128
1129 void CALLBACK DSOUND_timer(UINT timerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1130 {
1131         IDirectSoundImpl* This = (IDirectSoundImpl*)dwUser;
1132         TRACE("(%d,%d,0x%lx,0x%lx,0x%lx)\n",timerID,msg,dwUser,dw1,dw2);
1133         TRACE("entering at %ld\n", GetTickCount());
1134
1135         if (dsound != This) {
1136                 ERR("dsound died without killing us?\n");
1137                 timeKillEvent(timerID);
1138                 timeEndPeriod(DS_TIME_RES);
1139                 return;
1140         }
1141
1142         RtlAcquireResourceShared(&(This->lock), TRUE);
1143
1144         if (This->ref) {
1145                 DSOUND_PerformMix(This);
1146         }
1147
1148         RtlReleaseResource(&(This->lock));
1149
1150         TRACE("completed processing at %ld\n", GetTickCount());
1151 }
1152
1153 void CALLBACK DSOUND_callback(HWAVEOUT hwo, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1154 {
1155         IDirectSoundImpl* This = (IDirectSoundImpl*)dwUser;
1156         TRACE("(%p,%x,%lx,%lx,%lx)\n",hwo,msg,dwUser,dw1,dw2);
1157         TRACE("entering at %ld, msg=%08x(%s)\n", GetTickCount(), msg,
1158                 msg==MM_WOM_DONE ? "MM_WOM_DONE" : msg==MM_WOM_CLOSE ? "MM_WOM_CLOSE" :
1159                 msg==MM_WOM_OPEN ? "MM_WOM_OPEN" : "UNKNOWN");
1160         if (msg == MM_WOM_DONE) {
1161                 DWORD inq, mixq, fraglen, buflen, pwplay, playpos, mixpos;
1162                 if (This->pwqueue == (DWORD)-1) {
1163                         TRACE("completed due to reset\n");
1164                         return;
1165                 }
1166 /* it could be a bad idea to enter critical section here... if there's lock contention,
1167  * the resulting scheduling delays might obstruct the winmm player thread */
1168 #ifdef SYNC_CALLBACK
1169                 EnterCriticalSection(&(This->mixlock));
1170 #endif
1171                 /* retrieve current values */
1172                 fraglen = This->fraglen;
1173                 buflen = This->buflen;
1174                 pwplay = This->pwplay;
1175                 playpos = pwplay * fraglen;
1176                 mixpos = This->mixpos;
1177                 /* check remaining mixed data */
1178                 inq = ((mixpos < playpos) ? buflen : 0) + mixpos - playpos;
1179                 mixq = inq / fraglen;
1180                 if ((inq - (mixq * fraglen)) > 0) mixq++;
1181                 /* complete the playing buffer */
1182                 TRACE("done playing primary pos=%ld\n", playpos);
1183                 pwplay++;
1184                 if (pwplay >= DS_HEL_FRAGS) pwplay = 0;
1185                 /* write new values */
1186                 This->pwplay = pwplay;
1187                 This->pwqueue--;
1188                 /* queue new buffer if we have data for it */
1189                 if (inq>1) DSOUND_WaveQueue(This, inq-1);
1190 #ifdef SYNC_CALLBACK
1191                 LeaveCriticalSection(&(This->mixlock));
1192 #endif
1193         }
1194         TRACE("completed\n");
1195 }