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   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->pwfx->nChannels * (dsb->pwfx->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->pwfx->wBitsPerSample == 8)  {
 184                 if (dsb->dsound->pwfx->wBitsPerSample == 8 &&
 185                     dsb->dsound->pwfx->nChannels == dsb->pwfx->nChannels) {
 186                         /* avoid needless 8->16->8 conversion */
 187                         *obuf=*ibuf;
 188                         if (dsb->pwfx->nChannels==2)
 189                                 *(obuf+1)=*(ibuf+1);
 190                         return;
 191                 }
 192                 fl = cvtU8toS16(*ibuf);
 193                 fr = (dsb->pwfx->nChannels==2 ? cvtU8toS16(*(ibuf + 1)) : fl);
 194         } else {
 195                 fl = *((INT16 *)ibuf);
 196                 fr = (dsb->pwfx->nChannels==2 ? *(((INT16 *)ibuf) + 1)  : fl);
 197         }
 198
 199         if (dsb->dsound->pwfx->nChannels == 2) {
 200                 if (dsb->dsound->pwfx->wBitsPerSample == 8) {
 201                         *obuf = cvtS16toU8(fl);
 202                         *(obuf + 1) = cvtS16toU8(fr);
 203                         return;
 204                 }
 205                 if (dsb->dsound->pwfx->wBitsPerSample == 16) {
 206                         *((INT16 *)obuf) = fl;
 207                         *(((INT16 *)obuf) + 1) = fr;
 208                         return;
 209                 }
 210         }
 211         if (dsb->dsound->pwfx->nChannels == 1) {
 212                 fl = (fl + fr) >> 1;
 213                 if (dsb->dsound->pwfx->wBitsPerSample == 8) {
 214                         *obuf = cvtS16toU8(fl);
 215                         return;
 216                 }
 217                 if (dsb->dsound->pwfx->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->pwfx->nBlockAlign;
 230         INT     oAdvance = dsb->dsound->pwfx->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->pwfx->nSamplesPerSec) &&
 238             (dsb->pwfx->wBitsPerSample == dsb->dsound->pwfx->wBitsPerSample) &&
 239             (dsb->pwfx->nChannels == dsb->dsound->pwfx->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->pwfx->nSamplesPerSec) {
 253                 TRACE("(%p) Same sample rate %ld = primary %ld\n", dsb,
 254                         dsb->freq, dsb->dsound->pwfx->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->pwfx->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                         ipos %= dsb->buflen;
 290                 }
 291         }
 292         return ilen;
 293 }
 294
 295 static void DSOUND_MixerVol(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
 296 {
 297         INT     i;
 298         BYTE    *bpc = buf;
 299         INT16   *bps = (INT16 *) buf;
 300
 301         TRACE("(%p,%p,%d)\n",dsb,buf,len);
 302         TRACE("left = %lx, right = %lx\n", dsb->cvolpan.dwTotalLeftAmpFactor,
 303                 dsb->cvolpan.dwTotalRightAmpFactor);
 304
 305         if ((!(dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) || (dsb->cvolpan.lPan == 0)) &&
 306             (!(dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) || (dsb->cvolpan.lVolume == 0)) &&
 307             !(dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 308                 return;         /* Nothing to do */
 309
 310         /* If we end up with some bozo coder using panning or 3D sound */
 311         /* with a mono primary buffer, it could sound very weird using */
 312         /* this method. Oh well, tough patooties. */
 313
 314         switch (dsb->dsound->pwfx->wBitsPerSample) {
 315         case 8:
 316                 /* 8-bit WAV is unsigned, but we need to operate */
 317                 /* on signed data for this to work properly */
 318                 switch (dsb->dsound->pwfx->nChannels) {
 319                 case 1:
 320                         for (i = 0; i < len; i++) {
 321                                 INT val = *bpc - 128;
 322                                 val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 323                                 *bpc = val + 128;
 324                                 bpc++;
 325                         }
 326                         break;
 327                 case 2:
 328                         for (i = 0; i < len; i+=2) {
 329                                 INT val = *bpc - 128;
 330                                 val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 331                                 *bpc++ = val + 128;
 332                                 val = *bpc - 128;
 333                                 val = (val * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
 334                                 *bpc = val + 128;
 335                                 bpc++;
 336                         }
 337                         break;
 338                 default:
 339                         FIXME("doesn't support %d channels\n", dsb->dsound->pwfx->nChannels);
 340                         break;
 341                 }
 342                 break;
 343         case 16:
 344                 /* 16-bit WAV is signed -- much better */
 345                 switch (dsb->dsound->pwfx->nChannels) {
 346                 case 1:
 347                         for (i = 0; i < len; i += 2) {
 348                                 *bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 349                                 bps++;
 350                         }
 351                         break;
 352                 case 2:
 353                         for (i = 0; i < len; i += 4) {
 354                                 *bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 355                                 bps++;
 356                                 *bps = (*bps * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
 357                                 bps++;
 358                         }
 359                         break;
 360                 default:
 361                         FIXME("doesn't support %d channels\n", dsb->dsound->pwfx->nChannels);
 362                         break;
 363                 }
 364                 break;
 365         default:
 366                 FIXME("doesn't support %d bit samples\n", dsb->dsound->pwfx->wBitsPerSample);
 367                 break;
 368         }
 369 }
 370
 371 static LPBYTE DSOUND_tmpbuffer(IDirectSoundImpl *dsound, DWORD len)
 372 {
 373     TRACE("(%p,%ld)\n",dsound,len);
 374
 375     if (len > dsound->tmp_buffer_len) {
 376         if (dsound->tmp_buffer)
 377             dsound->tmp_buffer = HeapReAlloc(GetProcessHeap(), 0, dsound->tmp_buffer, len);
 378         else
 379             dsound->tmp_buffer = HeapAlloc(GetProcessHeap(), 0, len);
 380
 381         dsound->tmp_buffer_len = len;
 382     }
 383
 384     return dsound->tmp_buffer;
 385 }
 386
 387 static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD fraglen)
 388 {
 389         INT     i, len, ilen, temp, field, nBlockAlign, todo;
 390         BYTE    *buf, *ibuf;
 391
 392         TRACE("(%p,%ld,%ld)\n",dsb,writepos,fraglen);
 393
 394         len = fraglen;
 395         if (!(dsb->playflags & DSBPLAY_LOOPING)) {
 396                 temp = MulDiv(dsb->dsound->pwfx->nAvgBytesPerSec, dsb->buflen,
 397                         dsb->nAvgBytesPerSec) -
 398                        MulDiv(dsb->dsound->pwfx->nAvgBytesPerSec, dsb->buf_mixpos,
 399                         dsb->nAvgBytesPerSec);
 400                 len = (len > temp) ? temp : len;
 401         }
 402         nBlockAlign = dsb->dsound->pwfx->nBlockAlign;
 403         len = len / nBlockAlign * nBlockAlign;  /* data alignment */
 404
 405         if (len == 0) {
 406                 /* This should only happen if we aren't looping and temp < nBlockAlign */
 407                 return 0;
 408         }
 409
 410         if ((buf = ibuf = DSOUND_tmpbuffer(dsb->dsound, len)) == NULL)
 411                 return 0;
 412
 413         TRACE("MixInBuffer (%p) len = %d, dest = %ld\n", dsb, len, writepos);
 414
 415         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 416         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 417             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 418             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 419                 DSOUND_MixerVol(dsb, ibuf, len);
 420
 421         if (dsb->dsound->pwfx->wBitsPerSample == 8) {
 422                 BYTE    *obuf = dsb->dsound->buffer + writepos;
 423
 424                 if ((writepos + len) <= dsb->dsound->buflen)
 425                         todo = len;
 426                 else
 427                         todo = dsb->dsound->buflen - writepos;
 428
 429                 for (i = 0; i < todo; i++) {
 430                         /* 8-bit WAV is unsigned */
 431                         field = (*ibuf++ - 128);
 432                         field += (*obuf - 128);
 433                         if (field > 127) field = 127;
 434                         else if (field < -128) field = -128;
 435                         *obuf++ = field + 128;
 436                 }
 437
 438                 if (todo < len) {
 439                         todo = len - todo;
 440                         obuf = dsb->dsound->buffer;
 441
 442                         for (i = 0; i < todo; i++) {
 443                                 /* 8-bit WAV is unsigned */
 444                                 field = (*ibuf++ - 128);
 445                                 field += (*obuf - 128);
 446                                 if (field > 127) field = 127;
 447                                 else if (field < -128) field = -128;
 448                                 *obuf++ = field + 128;
 449                         }
 450                 }
 451         } else {
 452                 INT16   *ibufs, *obufs;
 453
 454                 ibufs = (INT16 *) ibuf;
 455                 obufs = (INT16 *)(dsb->dsound->buffer + writepos);
 456
 457                 if ((writepos + len) <= dsb->dsound->buflen)
 458                         todo = len / 2;
 459                 else
 460                         todo = (dsb->dsound->buflen - writepos) / 2;
 461
 462                 for (i = 0; i < todo; i++) {
 463                         /* 16-bit WAV is signed */
 464                         field = *ibufs++;
 465                         field += *obufs;
 466                         if (field > 32767) field = 32767;
 467                         else if (field < -32768) field = -32768;
 468                         *obufs++ = field;
 469                 }
 470
 471                 if (todo < (len / 2)) {
 472                         todo = (len / 2) - todo;
 473                         obufs = (INT16 *)dsb->dsound->buffer;
 474
 475                         for (i = 0; i < todo; i++) {
 476                                 /* 16-bit WAV is signed */
 477                                 field = *ibufs++;
 478                                 field += *obufs;
 479                                 if (field > 32767) field = 32767;
 480                                 else if (field < -32768) field = -32768;
 481                                 *obufs++ = field;
 482                         }
 483                 }
 484         }
 485
 486         if (dsb->leadin && (dsb->startpos > dsb->buf_mixpos) && (dsb->startpos <= dsb->buf_mixpos + ilen)) {
 487                 /* HACK... leadin should be reset when the PLAY position reaches the startpos,
 488                  * not the MIX position... but if the sound buffer is bigger than our prebuffering
 489                  * (which must be the case for the streaming buffers that need this hack anyway)
 490                  * plus DS_HEL_MARGIN or equivalent, then this ought to work anyway. */
 491                 dsb->leadin = FALSE;
 492         }
 493
 494         dsb->buf_mixpos += ilen;
 495
 496         if (dsb->buf_mixpos >= dsb->buflen) {
 497                 if (dsb->playflags & DSBPLAY_LOOPING) {
 498                         /* wrap */
 499                         dsb->buf_mixpos %= dsb->buflen;
 500                         if (dsb->leadin && (dsb->startpos <= dsb->buf_mixpos))
 501                                 dsb->leadin = FALSE; /* HACK: see above */
 502                 }
 503         }
 504
 505         return len;
 506 }
 507
 508 static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD len)
 509 {
 510         INT     ilen, field, nBlockAlign;
 511         UINT    i, todo;
 512         BYTE    *buf, *ibuf;
 513
 514         TRACE("(%p,%ld,%ld)\n",dsb,writepos,len);
 515
 516         nBlockAlign = dsb->dsound->pwfx->nBlockAlign;
 517         len = len / nBlockAlign * nBlockAlign;  /* data alignment */
 518
 519         if ((buf = ibuf = DSOUND_tmpbuffer(dsb->dsound, len)) == NULL)
 520                 return;
 521
 522         TRACE("PhaseCancel (%p) len = %ld, dest = %ld\n", dsb, len, writepos);
 523
 524         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 525         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 526             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 527             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 528                 DSOUND_MixerVol(dsb, ibuf, len);
 529
 530         /* subtract instead of add, to phase out premixed data */
 531         if (dsb->dsound->pwfx->wBitsPerSample == 8) {
 532                 BYTE    *obuf = dsb->dsound->buffer + writepos;
 533
 534                 if ((writepos + len) <= dsb->dsound->buflen)
 535                         todo = len;
 536                 else
 537                         todo = dsb->dsound->buflen - writepos;
 538
 539                 for (i = 0; i < todo; i++) {
 540                         /* 8-bit WAV is unsigned */
 541                         field = (*ibuf++ - 128);
 542                         field -= (*obuf - 128);
 543                         if (field > 127) field = 127;
 544                         else if (field < -128) field = -128;
 545                         *obuf++ = field + 128;
 546                 }
 547
 548                 if (todo < len) {
 549                         todo = len - todo;
 550                         obuf = dsb->dsound->buffer;
 551
 552                         for (i = 0; i < todo; i++) {
 553                                 /* 8-bit WAV is unsigned */
 554                                 field = (*ibuf++ - 128);
 555                                 field -= (*obuf - 128);
 556                                 if (field > 127) field = 127;
 557                                 else if (field < -128) field = -128;
 558                                 *obuf++ = field + 128;
 559                         }
 560                 }
 561         } else {
 562                 INT16   *ibufs, *obufs;
 563
 564                 ibufs = (INT16 *) ibuf;
 565                 obufs = (INT16 *)(dsb->dsound->buffer + writepos);
 566
 567                 if ((writepos + len) <= dsb->dsound->buflen)
 568                         todo = len / 2;
 569                 else
 570                         todo = (dsb->dsound->buflen - writepos) / 2;
 571
 572                 for (i = 0; i < todo; i++) {
 573                         /* 16-bit WAV is signed */
 574                         field = *ibufs++;
 575                         field -= *obufs;
 576                         if (field > 32767) field = 32767;
 577                         else if (field < -32768) field = -32768;
 578                         *obufs++ = field;
 579                 }
 580
 581                 if (todo < (len / 2)) {
 582                         todo = (len / 2) - todo;
 583                         obufs = (INT16 *)dsb->dsound->buffer;
 584
 585                         for (i = 0; i < todo; i++) {
 586                                 /* 16-bit WAV is signed */
 587                                 field = *ibufs++;
 588                                 field -= *obufs;
 589                                 if (field > 32767) field = 32767;
 590                                 else if (field < -32768) field = -32768;
 591                                 *obufs++ = field;
 592                         }
 593                 }
 594         }
 595 }
 596
 597 static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)
 598 {
 599         DWORD   size, flen, len, npos, nlen;
 600         INT     iAdvance = dsb->pwfx->nBlockAlign;
 601         INT     oAdvance = dsb->dsound->pwfx->nBlockAlign;
 602         /* determine amount of premixed data to cancel */
 603         DWORD primary_done =
 604                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
 605                 dsb->primary_mixpos - writepos;
 606
 607         TRACE("(%p, %ld), buf_mixpos=%ld\n", dsb, writepos, dsb->buf_mixpos);
 608
 609         /* backtrack the mix position */
 610         size = primary_done / oAdvance;
 611         flen = size * dsb->freqAdjust;
 612         len = (flen >> DSOUND_FREQSHIFT) * iAdvance;
 613         flen &= (1<<DSOUND_FREQSHIFT)-1;
 614         while (dsb->freqAcc < flen) {
 615                 len += iAdvance;
 616                 dsb->freqAcc += 1<<DSOUND_FREQSHIFT;
 617         }
 618         len %= dsb->buflen;
 619         npos = ((dsb->buf_mixpos < len) ? dsb->buflen : 0) +
 620                 dsb->buf_mixpos - len;
 621         if (dsb->leadin && (dsb->startpos > npos) && (dsb->startpos <= npos + len)) {
 622                 /* stop backtracking at startpos */
 623                 npos = dsb->startpos;
 624                 len = ((dsb->buf_mixpos < npos) ? dsb->buflen : 0) +
 625                         dsb->buf_mixpos - npos;
 626                 flen = dsb->freqAcc;
 627                 nlen = len / dsb->pwfx->nBlockAlign;
 628                 nlen = ((nlen << DSOUND_FREQSHIFT) + flen) / dsb->freqAdjust;
 629                 nlen *= dsb->dsound->pwfx->nBlockAlign;
 630                 writepos =
 631                         ((dsb->primary_mixpos < nlen) ? dsb->dsound->buflen : 0) +
 632                         dsb->primary_mixpos - nlen;
 633         }
 634
 635         dsb->freqAcc -= flen;
 636         dsb->buf_mixpos = npos;
 637         dsb->primary_mixpos = writepos;
 638
 639         TRACE("new buf_mixpos=%ld, primary_mixpos=%ld (len=%ld)\n",
 640               dsb->buf_mixpos, dsb->primary_mixpos, len);
 641
 642         if (cancel) DSOUND_PhaseCancel(dsb, writepos, len);
 643 }
 644
 645 void DSOUND_MixCancelAt(IDirectSoundBufferImpl *dsb, DWORD buf_writepos)
 646 {
 647 #if 0
 648         DWORD   i, size, flen, len, npos, nlen;
 649         INT     iAdvance = dsb->pwfx->nBlockAlign;
 650         INT     oAdvance = dsb->dsound->pwfx->nBlockAlign;
 651         /* determine amount of premixed data to cancel */
 652         DWORD buf_done =
 653                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 654                 dsb->buf_mixpos - buf_writepos;
 655 #endif
 656
 657         WARN("(%p, %ld), buf_mixpos=%ld\n", dsb, buf_writepos, dsb->buf_mixpos);
 658         /* since this is not implemented yet, just cancel *ALL* prebuffering for now
 659          * (which is faster anyway when there's only a single secondary buffer) */
 660         dsb->dsound->need_remix = TRUE;
 661 }
 662
 663 void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
 664 {
 665         TRACE("(%p)\n",dsb);
 666         EnterCriticalSection(&dsb->lock);
 667         if (dsb->state == STATE_PLAYING) {
 668 #if 0 /* this may not be quite reliable yet */
 669                 dsb->need_remix = TRUE;
 670 #else
 671                 dsb->dsound->need_remix = TRUE;
 672 #endif
 673         }
 674         LeaveCriticalSection(&dsb->lock);
 675 }
 676
 677 static DWORD DSOUND_MixOne(IDirectSoundBufferImpl *dsb, DWORD playpos, DWORD writepos, DWORD mixlen)
 678 {
 679         DWORD len, slen;
 680         /* determine this buffer's write position */
 681         DWORD buf_writepos = DSOUND_CalcPlayPosition(dsb, dsb->state & dsb->dsound->state, writepos,
 682                                                      writepos, dsb->primary_mixpos, dsb->buf_mixpos);
 683         /* determine how much already-mixed data exists */
 684         DWORD buf_done =
 685                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 686                 dsb->buf_mixpos - buf_writepos;
 687         DWORD primary_done =
 688                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
 689                 dsb->primary_mixpos - writepos;
 690         DWORD adv_done =
 691                 ((dsb->dsound->mixpos < writepos) ? dsb->dsound->buflen : 0) +
 692                 dsb->dsound->mixpos - writepos;
 693         DWORD played =
 694                 ((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
 695                 buf_writepos - dsb->playpos;
 696         DWORD buf_left = dsb->buflen - buf_writepos;
 697         int still_behind;
 698
 699         TRACE("(%p,%ld,%ld,%ld)\n",dsb,playpos,writepos,mixlen);
 700         TRACE("buf_writepos=%ld, primary_writepos=%ld\n", buf_writepos, writepos);
 701         TRACE("buf_done=%ld, primary_done=%ld\n", buf_done, primary_done);
 702         TRACE("buf_mixpos=%ld, primary_mixpos=%ld, mixlen=%ld\n", dsb->buf_mixpos, dsb->primary_mixpos,
 703               mixlen);
 704         TRACE("looping=%ld, startpos=%ld, leadin=%ld\n", dsb->playflags, dsb->startpos, dsb->leadin);
 705
 706         /* check for notification positions */
 707         if (dsb->dsbd.dwFlags & DSBCAPS_CTRLPOSITIONNOTIFY &&
 708             dsb->state != STATE_STARTING) {
 709                 DSOUND_CheckEvent(dsb, played);
 710         }
 711
 712         /* save write position for non-GETCURRENTPOSITION2... */
 713         dsb->playpos = buf_writepos;
 714
 715         /* check whether CalcPlayPosition detected a mixing underrun */
 716         if ((buf_done == 0) && (dsb->primary_mixpos != writepos)) {
 717                 /* it did, but did we have more to play? */
 718                 if ((dsb->playflags & DSBPLAY_LOOPING) ||
 719                     (dsb->buf_mixpos < dsb->buflen)) {
 720                         /* yes, have to recover */
 721                         ERR("underrun on sound buffer %p\n", dsb);
 722                         TRACE("recovering from underrun: primary_mixpos=%ld\n", writepos);
 723                 }
 724                 dsb->primary_mixpos = writepos;
 725                 primary_done = 0;
 726         }
 727         /* determine how far ahead we should mix */
 728         if (((dsb->playflags & DSBPLAY_LOOPING) ||
 729              (dsb->leadin && (dsb->probably_valid_to != 0))) &&
 730             !(dsb->dsbd.dwFlags & DSBCAPS_STATIC)) {
 731                 /* if this is a streaming buffer, it typically means that
 732                  * we should defer mixing past probably_valid_to as long
 733                  * as we can, to avoid unnecessary remixing */
 734                 /* the heavy-looking calculations shouldn't be that bad,
 735                  * as any game isn't likely to be have more than 1 or 2
 736                  * streaming buffers in use at any time anyway... */
 737                 DWORD probably_valid_left =
 738                         (dsb->probably_valid_to == (DWORD)-1) ? dsb->buflen :
 739                         ((dsb->probably_valid_to < buf_writepos) ? dsb->buflen : 0) +
 740                         dsb->probably_valid_to - buf_writepos;
 741                 /* check for leadin condition */
 742                 if ((probably_valid_left == 0) &&
 743                     (dsb->probably_valid_to == dsb->startpos) &&
 744                     dsb->leadin)
 745                         probably_valid_left = dsb->buflen;
 746                 TRACE("streaming buffer probably_valid_to=%ld, probably_valid_left=%ld\n",
 747                       dsb->probably_valid_to, probably_valid_left);
 748                 /* check whether the app's time is already up */
 749                 if (probably_valid_left < dsb->writelead) {
 750                         WARN("probably_valid_to now within writelead, possible streaming underrun\n");
 751                         /* once we pass the point of no return,
 752                          * no reason to hold back anymore */
 753                         dsb->probably_valid_to = (DWORD)-1;
 754                         /* we just have to go ahead and mix what we have,
 755                          * there's no telling what the app is thinking anyway */
 756                 } else {
 757                         /* adjust for our frequency and our sample size */
 758                         probably_valid_left = MulDiv(probably_valid_left,
 759                                                      1 << DSOUND_FREQSHIFT,
 760                                                      dsb->pwfx->nBlockAlign * dsb->freqAdjust) *
 761                                               dsb->dsound->pwfx->nBlockAlign;
 762                         /* check whether to clip mix_len */
 763                         if (probably_valid_left < mixlen) {
 764                                 TRACE("clipping to probably_valid_left=%ld\n", probably_valid_left);
 765                                 mixlen = probably_valid_left;
 766                         }
 767                 }
 768         }
 769         /* cut mixlen with what's already been mixed */
 770         if (mixlen < primary_done) {
 771                 /* huh? and still CalcPlayPosition didn't
 772                  * detect an underrun? */
 773                 FIXME("problem with underrun detection (mixlen=%ld < primary_done=%ld)\n", mixlen, primary_done);
 774                 return 0;
 775         }
 776         len = mixlen - primary_done;
 777         TRACE("remaining mixlen=%ld\n", len);
 778
 779         if (len < dsb->dsound->fraglen) {
 780                 /* smaller than a fragment, wait until it gets larger
 781                  * before we take the mixing overhead */
 782                 TRACE("mixlen not worth it, deferring mixing\n");
 783                 still_behind = 1;
 784                 goto post_mix;
 785         }
 786
 787         /* ok, we know how much to mix, let's go */
 788         still_behind = (adv_done > primary_done);
 789         while (len) {
 790                 slen = dsb->dsound->buflen - dsb->primary_mixpos;
 791                 if (slen > len) slen = len;
 792                 slen = DSOUND_MixInBuffer(dsb, dsb->primary_mixpos, slen);
 793
 794                 if ((dsb->primary_mixpos < dsb->dsound->mixpos) &&
 795                     (dsb->primary_mixpos + slen >= dsb->dsound->mixpos))
 796                         still_behind = FALSE;
 797
 798                 dsb->primary_mixpos += slen; len -= slen;
 799                 dsb->primary_mixpos %= dsb->dsound->buflen;
 800
 801                 if ((dsb->state == STATE_STOPPED) || !slen) break;
 802         }
 803         TRACE("new primary_mixpos=%ld, primary_advbase=%ld\n", dsb->primary_mixpos, dsb->dsound->mixpos);
 804         TRACE("mixed data len=%ld, still_behind=%d\n", mixlen-len, still_behind);
 805
 806 post_mix:
 807         /* check if buffer should be considered complete */
 808         if (buf_left < dsb->writelead &&
 809             !(dsb->playflags & DSBPLAY_LOOPING)) {
 810                 dsb->state = STATE_STOPPED;
 811                 dsb->playpos = 0;
 812                 dsb->last_playpos = 0;
 813                 dsb->buf_mixpos = 0;
 814                 dsb->leadin = FALSE;
 815                 DSOUND_CheckEvent(dsb, buf_left);
 816         }
 817
 818         /* return how far we think the primary buffer can
 819          * advance its underrun detector...*/
 820         if (still_behind) return 0;
 821         if ((mixlen - len) < primary_done) return 0;
 822         slen = ((dsb->primary_mixpos < dsb->dsound->mixpos) ?
 823                 dsb->dsound->buflen : 0) + dsb->primary_mixpos -
 824                 dsb->dsound->mixpos;
 825         if (slen > mixlen) {
 826                 /* the primary_done and still_behind checks above should have worked */
 827                 FIXME("problem with advancement calculation (advlen=%ld > mixlen=%ld)\n", slen, mixlen);
 828                 slen = 0;
 829         }
 830         return slen;
 831 }
 832
 833 static DWORD DSOUND_MixToPrimary(IDirectSoundImpl *dsound, DWORD playpos, DWORD writepos, DWORD mixlen, BOOL recover)
 834 {
 835         INT                     i, len, maxlen = 0;
 836         IDirectSoundBufferImpl  *dsb;
 837
 838         TRACE("(%ld,%ld,%ld,%d)\n", playpos, writepos, mixlen, recover);
 839         for (i = 0; i < dsound->nrofbuffers; i++) {
 840                 dsb = dsound->buffers[i];
 841
 842                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 843                         TRACE("Checking %p, mixlen=%ld\n", dsb, mixlen);
 844                         EnterCriticalSection(&(dsb->lock));
 845                         if (dsb->state == STATE_STOPPING) {
 846                                 DSOUND_MixCancel(dsb, writepos, TRUE);
 847                                 dsb->state = STATE_STOPPED;
 848                                 DSOUND_CheckEvent(dsb, 0);
 849                         } else {
 850                                 if ((dsb->state == STATE_STARTING) || recover) {
 851                                         dsb->primary_mixpos = writepos;
 852                                         dsb->cvolpan = dsb->volpan;
 853                                         dsb->need_remix = FALSE;
 854                                 }
 855                                 else if (dsb->need_remix) {
 856                                         DSOUND_MixCancel(dsb, writepos, TRUE);
 857                                         dsb->cvolpan = dsb->volpan;
 858                                         dsb->need_remix = FALSE;
 859                                 }
 860                                 len = DSOUND_MixOne(dsb, playpos, writepos, mixlen);
 861                                 if (dsb->state == STATE_STARTING)
 862                                         dsb->state = STATE_PLAYING;
 863                                 maxlen = (len > maxlen) ? len : maxlen;
 864                         }
 865                         LeaveCriticalSection(&(dsb->lock));
 866                 }
 867         }
 868
 869         return maxlen;
 870 }
 871
 872 static void DSOUND_MixReset(IDirectSoundImpl *dsound, DWORD writepos)
 873 {
 874         INT                     i;
 875         IDirectSoundBufferImpl  *dsb;
 876         int nfiller;
 877
 878         TRACE("(%ld)\n", writepos);
 879
 880         /* the sound of silence */
 881         nfiller = dsound->pwfx->wBitsPerSample == 8 ? 128 : 0;
 882
 883         /* reset all buffer mix positions */
 884         for (i = 0; i < dsound->nrofbuffers; i++) {
 885                 dsb = dsound->buffers[i];
 886
 887                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 888                         TRACE("Resetting %p\n", dsb);
 889                         EnterCriticalSection(&(dsb->lock));
 890                         if (dsb->state == STATE_STOPPING) {
 891                                 dsb->state = STATE_STOPPED;
 892                         }
 893                         else if (dsb->state == STATE_STARTING) {
 894                                 /* nothing */
 895                         } else {
 896                                 DSOUND_MixCancel(dsb, writepos, FALSE);
 897                                 dsb->cvolpan = dsb->volpan;
 898                                 dsb->need_remix = FALSE;
 899                         }
 900                         LeaveCriticalSection(&(dsb->lock));
 901                 }
 902         }
 903
 904         /* wipe out premixed data */
 905         if (dsound->mixpos < writepos) {
 906                 memset(dsound->buffer + writepos, nfiller, dsound->buflen - writepos);
 907                 memset(dsound->buffer, nfiller, dsound->mixpos);
 908         } else {
 909                 memset(dsound->buffer + writepos, nfiller, dsound->mixpos - writepos);
 910         }
 911
 912         /* reset primary mix position */
 913         dsound->mixpos = writepos;
 914 }
 915
 916 static void DSOUND_CheckReset(IDirectSoundImpl *dsound, DWORD writepos)
 917 {
 918         TRACE("(%p,%ld)\n",dsound,writepos);
 919         if (dsound->need_remix) {
 920                 DSOUND_MixReset(dsound, writepos);
 921                 dsound->need_remix = FALSE;
 922                 /* maximize Half-Life performance */
 923                 dsound->prebuf = ds_snd_queue_min;
 924                 dsound->precount = 0;
 925         } else {
 926                 dsound->precount++;
 927                 if (dsound->precount >= 4) {
 928                         if (dsound->prebuf < ds_snd_queue_max)
 929                                 dsound->prebuf++;
 930                         dsound->precount = 0;
 931                 }
 932         }
 933         TRACE("premix adjust: %d\n", dsound->prebuf);
 934 }
 935
 936 void DSOUND_WaveQueue(IDirectSoundImpl *dsound, DWORD mixq)
 937 {
 938         TRACE("(%p,%ld)\n",dsound,mixq);
 939         if (mixq + dsound->pwqueue > ds_hel_queue) mixq = ds_hel_queue - dsound->pwqueue;
 940         TRACE("queueing %ld buffers, starting at %d\n", mixq, dsound->pwwrite);
 941         for (; mixq; mixq--) {
 942                 waveOutWrite(dsound->hwo, dsound->pwave[dsound->pwwrite], sizeof(WAVEHDR));
 943                 dsound->pwwrite++;
 944                 if (dsound->pwwrite >= DS_HEL_FRAGS) dsound->pwwrite = 0;
 945                 dsound->pwqueue++;
 946         }
 947 }
 948
 949 /* #define SYNC_CALLBACK */
 950
 951 void DSOUND_PerformMix(IDirectSoundImpl *dsound)
 952 {
 953         int nfiller;
 954         BOOL forced;
 955         HRESULT hres;
 956
 957         TRACE("(%p)\n", dsound);
 958
 959         /* the sound of silence */
 960         nfiller = dsound->pwfx->wBitsPerSample == 8 ? 128 : 0;
 961
 962         /* whether the primary is forced to play even without secondary buffers */
 963         forced = ((dsound->state == STATE_PLAYING) || (dsound->state == STATE_STARTING));
 964
 965         if (dsound->priolevel != DSSCL_WRITEPRIMARY) {
 966                 BOOL paused = ((dsound->state == STATE_STOPPED) || (dsound->state == STATE_STARTING));
 967                 /* FIXME: document variables */
 968                 DWORD playpos, writepos, inq, maxq, frag;
 969                 if (dsound->hwbuf) {
 970                         hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, &writepos);
 971                         if (hres) {
 972                             WARN("IDsDriverBuffer_GetPosition failed\n");
 973                             return;
 974                         }
 975                         /* Well, we *could* do Just-In-Time mixing using the writepos,
 976                          * but that's a little bit ambitious and unnecessary... */
 977                         /* rather add our safety margin to the writepos, if we're playing */
 978                         if (!paused) {
 979                                 writepos += dsound->writelead;
 980                                 writepos %= dsound->buflen;
 981                         } else writepos = playpos;
 982                 } else {
 983                         playpos = dsound->pwplay * dsound->fraglen;
 984                         writepos = playpos;
 985                         if (!paused) {
 986                                 writepos += ds_hel_margin * dsound->fraglen;
 987                                 writepos %= dsound->buflen;
 988                         }
 989                 }
 990                 TRACE("primary playpos=%ld, writepos=%ld, clrpos=%ld, mixpos=%ld, buflen=%ld\n",
 991                       playpos,writepos,dsound->playpos,dsound->mixpos,dsound->buflen);
 992                 assert(dsound->playpos < dsound->buflen);
 993                 /* wipe out just-played sound data */
 994                 if (playpos < dsound->playpos) {
 995                         memset(dsound->buffer + dsound->playpos, nfiller, dsound->buflen - dsound->playpos);
 996                         memset(dsound->buffer, nfiller, playpos);
 997                 } else {
 998                         memset(dsound->buffer + dsound->playpos, nfiller, playpos - dsound->playpos);
 999                 }
1000                 dsound->playpos = playpos;
1001
1002                 EnterCriticalSection(&(dsound->mixlock));
1003
1004                 /* reset mixing if necessary */
1005                 DSOUND_CheckReset(dsound, writepos);
1006
1007                 /* check how much prebuffering is left */
1008                 inq = dsound->mixpos;
1009                 if (inq < writepos)
1010                         inq += dsound->buflen;
1011                 inq -= writepos;
1012
1013                 /* find the maximum we can prebuffer */
1014                 if (!paused) {
1015                         maxq = playpos;
1016                         if (maxq < writepos)
1017                                 maxq += dsound->buflen;
1018                         maxq -= writepos;
1019                 } else maxq = dsound->buflen;
1020
1021                 /* clip maxq to dsound->prebuf */
1022                 frag = dsound->prebuf * dsound->fraglen;
1023                 if (maxq > frag) maxq = frag;
1024
1025                 /* check for consistency */
1026                 if (inq > maxq) {
1027                         /* the playback position must have passed our last
1028                          * mixed position, i.e. it's an underrun, or we have
1029                          * nothing more to play */
1030                         TRACE("reached end of mixed data (inq=%ld, maxq=%ld)\n", inq, maxq);
1031                         inq = 0;
1032                         /* stop the playback now, to allow buffers to refill */
1033                         if (dsound->state == STATE_PLAYING) {
1034                                 dsound->state = STATE_STARTING;
1035                         }
1036                         else if (dsound->state == STATE_STOPPING) {
1037                                 dsound->state = STATE_STOPPED;
1038                         }
1039                         else {
1040                                 /* how can we have an underrun if we aren't playing? */
1041                                 WARN("unexpected primary state (%ld)\n", dsound->state);
1042                         }
1043 #ifdef SYNC_CALLBACK
1044                         /* DSOUND_callback may need this lock */
1045                         LeaveCriticalSection(&(dsound->mixlock));
1046 #endif
1047                         if (DSOUND_PrimaryStop(dsound) != DS_OK)
1048                                 WARN("DSOUND_PrimaryStop failed\n");
1049 #ifdef SYNC_CALLBACK
1050                         EnterCriticalSection(&(dsound->mixlock));
1051 #endif
1052                         if (dsound->hwbuf) {
1053                                 /* the Stop is supposed to reset play position to beginning of buffer */
1054                                 /* unfortunately, OSS is not able to do so, so get current pointer */
1055                                 hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, NULL);
1056                                 if (hres) {
1057                                         LeaveCriticalSection(&(dsound->mixlock));
1058                                         WARN("IDsDriverBuffer_GetPosition failed\n");
1059                                         return;
1060                                 }
1061                         } else {
1062                                 playpos = dsound->pwplay * dsound->fraglen;
1063                         }
1064                         writepos = playpos;
1065                         dsound->playpos = playpos;
1066                         dsound->mixpos = writepos;
1067                         inq = 0;
1068                         maxq = dsound->buflen;
1069                         if (maxq > frag) maxq = frag;
1070                         memset(dsound->buffer, nfiller, dsound->buflen);
1071                         paused = TRUE;
1072                 }
1073
1074                 /* do the mixing */
1075                 frag = DSOUND_MixToPrimary(dsound, playpos, writepos, maxq, paused);
1076                 if (forced) frag = maxq - inq;
1077                 dsound->mixpos += frag;
1078                 dsound->mixpos %= dsound->buflen;
1079
1080                 if (frag) {
1081                         /* buffers have been filled, restart playback */
1082                         if (dsound->state == STATE_STARTING) {
1083                                 dsound->state = STATE_PLAYING;
1084                         }
1085                         else if (dsound->state == STATE_STOPPED) {
1086                                 /* the dsound is supposed to play if there's something to play
1087                                  * even if it is reported as stopped, so don't let this confuse you */
1088                                 dsound->state = STATE_STOPPING;
1089                         }
1090                         LeaveCriticalSection(&(dsound->mixlock));
1091                         if (paused) {
1092                                 if (DSOUND_PrimaryPlay(dsound) != DS_OK)
1093                                         WARN("DSOUND_PrimaryPlay failed\n");
1094                                 else
1095                                         TRACE("starting playback\n");
1096                         }
1097                 }
1098                 else
1099                         LeaveCriticalSection(&(dsound->mixlock));
1100         } else {
1101                 /* in the DSSCL_WRITEPRIMARY mode, the app is totally in charge... */
1102                 if (dsound->state == STATE_STARTING) {
1103                         if (DSOUND_PrimaryPlay(dsound) != DS_OK)
1104                                 WARN("DSOUND_PrimaryPlay failed\n");
1105                         else
1106                                 dsound->state = STATE_PLAYING;
1107                 }
1108                 else if (dsound->state == STATE_STOPPING) {
1109                         if (DSOUND_PrimaryStop(dsound) != DS_OK)
1110                                 WARN("DSOUND_PrimaryStop failed\n");
1111                         else
1112                                 dsound->state = STATE_STOPPED;
1113                 }
1114         }
1115 }
1116
1117 void CALLBACK DSOUND_timer(UINT timerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1118 {
1119         IDirectSoundImpl* This = (IDirectSoundImpl*)dwUser;
1120         DWORD start_time =  GetTickCount();
1121         DWORD end_time;
1122         TRACE("(%d,%d,0x%lx,0x%lx,0x%lx)\n",timerID,msg,dwUser,dw1,dw2);
1123         TRACE("entering at %ld\n", start_time);
1124
1125         if (dsound != This) {
1126                 ERR("dsound died without killing us?\n");
1127                 timeKillEvent(timerID);
1128                 timeEndPeriod(DS_TIME_RES);
1129                 return;
1130         }
1131
1132         RtlAcquireResourceShared(&(This->buffer_list_lock), TRUE);
1133
1134         if (This->ref)
1135                 DSOUND_PerformMix(This);
1136
1137         RtlReleaseResource(&(This->buffer_list_lock));
1138
1139         end_time = GetTickCount();
1140         TRACE("completed processing at %ld, duration = %ld\n", end_time, end_time - start_time);
1141 }
1142
1143 void CALLBACK DSOUND_callback(HWAVEOUT hwo, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1144 {
1145         IDirectSoundImpl* This = (IDirectSoundImpl*)dwUser;
1146         TRACE("(%p,%x,%lx,%lx,%lx)\n",hwo,msg,dwUser,dw1,dw2);
1147         TRACE("entering at %ld, msg=%08x(%s)\n", GetTickCount(), msg,
1148                 msg==MM_WOM_DONE ? "MM_WOM_DONE" : msg==MM_WOM_CLOSE ? "MM_WOM_CLOSE" :
1149                 msg==MM_WOM_OPEN ? "MM_WOM_OPEN" : "UNKNOWN");
1150         if (msg == MM_WOM_DONE) {
1151                 DWORD inq, mixq, fraglen, buflen, pwplay, playpos, mixpos;
1152                 if (This->pwqueue == (DWORD)-1) {
1153                         TRACE("completed due to reset\n");
1154                         return;
1155                 }
1156 /* it could be a bad idea to enter critical section here... if there's lock contention,
1157  * the resulting scheduling delays might obstruct the winmm player thread */
1158 #ifdef SYNC_CALLBACK
1159                 EnterCriticalSection(&(This->mixlock));
1160 #endif
1161                 /* retrieve current values */
1162                 fraglen = This->fraglen;
1163                 buflen = This->buflen;
1164                 pwplay = This->pwplay;
1165                 playpos = pwplay * fraglen;
1166                 mixpos = This->mixpos;
1167                 /* check remaining mixed data */
1168                 inq = ((mixpos < playpos) ? buflen : 0) + mixpos - playpos;
1169                 mixq = inq / fraglen;
1170                 if ((inq - (mixq * fraglen)) > 0) mixq++;
1171                 /* complete the playing buffer */
1172                 TRACE("done playing primary pos=%ld\n", playpos);
1173                 pwplay++;
1174                 if (pwplay >= DS_HEL_FRAGS) pwplay = 0;
1175                 /* write new values */
1176                 This->pwplay = pwplay;
1177                 This->pwqueue--;
1178                 /* queue new buffer if we have data for it */
1179                 if (inq>1) DSOUND_WaveQueue(This, inq-1);
1180 #ifdef SYNC_CALLBACK
1181                 LeaveCriticalSection(&(This->mixlock));
1182 #endif
1183         }
1184         TRACE("completed\n");
1185 }