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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 void *tmp_buffer;
 372 static size_t tmp_buffer_len = 0;
 373
 374 static void *DSOUND_tmpbuffer(size_t len)
 375 {
 376   if (len>tmp_buffer_len) {
 377     void *new_buffer = realloc(tmp_buffer, len);
 378     if (new_buffer) {
 379       tmp_buffer = new_buffer;
 380       tmp_buffer_len = len;
 381     }
 382     return new_buffer;
 383   }
 384   return 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         /* Been seeing segfaults in malloc() for some reason... */
 411         TRACE("allocating buffer (size = %d)\n", len);
 412         if ((buf = ibuf = (BYTE *) DSOUND_tmpbuffer(len)) == NULL)
 413                 return 0;
 414
 415         TRACE("MixInBuffer (%p) len = %d, dest = %ld\n", dsb, len, writepos);
 416
 417         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 418         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 419             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 420             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 421                 DSOUND_MixerVol(dsb, ibuf, len);
 422
 423         if (dsb->dsound->pwfx->wBitsPerSample == 8) {
 424                 BYTE    *obuf = dsb->dsound->buffer + writepos;
 425
 426                 if ((writepos + len) <= dsb->dsound->buflen)
 427                         todo = len;
 428                 else
 429                         todo = dsb->dsound->buflen - writepos;
 430
 431                 for (i = 0; i < todo; i++) {
 432                         /* 8-bit WAV is unsigned */
 433                         field = (*ibuf++ - 128);
 434                         field += (*obuf - 128);
 435                         if (field > 127) field = 127;
 436                         else if (field < -128) field = -128;
 437                         *obuf++ = field + 128;
 438                 }
 439
 440                 if (todo < len) {
 441                         todo = len - todo;
 442                         obuf = dsb->dsound->buffer;
 443
 444                         for (i = 0; i < todo; i++) {
 445                                 /* 8-bit WAV is unsigned */
 446                                 field = (*ibuf++ - 128);
 447                                 field += (*obuf - 128);
 448                                 if (field > 127) field = 127;
 449                                 else if (field < -128) field = -128;
 450                                 *obuf++ = field + 128;
 451                         }
 452                 }
 453         } else {
 454                 INT16   *ibufs, *obufs;
 455
 456                 ibufs = (INT16 *) ibuf;
 457                 obufs = (INT16 *)(dsb->dsound->buffer + writepos);
 458
 459                 if ((writepos + len) <= dsb->dsound->buflen)
 460                         todo = len / 2;
 461                 else
 462                         todo = (dsb->dsound->buflen - writepos) / 2;
 463
 464                 for (i = 0; i < todo; i++) {
 465                         /* 16-bit WAV is signed */
 466                         field = *ibufs++;
 467                         field += *obufs;
 468                         if (field > 32767) field = 32767;
 469                         else if (field < -32768) field = -32768;
 470                         *obufs++ = field;
 471                 }
 472
 473                 if (todo < (len / 2)) {
 474                         todo = (len / 2) - todo;
 475                         obufs = (INT16 *)dsb->dsound->buffer;
 476
 477                         for (i = 0; i < todo; i++) {
 478                                 /* 16-bit WAV is signed */
 479                                 field = *ibufs++;
 480                                 field += *obufs;
 481                                 if (field > 32767) field = 32767;
 482                                 else if (field < -32768) field = -32768;
 483                                 *obufs++ = field;
 484                         }
 485                 }
 486         }
 487
 488         if (dsb->leadin && (dsb->startpos > dsb->buf_mixpos) && (dsb->startpos <= dsb->buf_mixpos + ilen)) {
 489                 /* HACK... leadin should be reset when the PLAY position reaches the startpos,
 490                  * not the MIX position... but if the sound buffer is bigger than our prebuffering
 491                  * (which must be the case for the streaming buffers that need this hack anyway)
 492                  * plus DS_HEL_MARGIN or equivalent, then this ought to work anyway. */
 493                 dsb->leadin = FALSE;
 494         }
 495
 496         dsb->buf_mixpos += ilen;
 497
 498         if (dsb->buf_mixpos >= dsb->buflen) {
 499                 if (dsb->playflags & DSBPLAY_LOOPING) {
 500                         /* wrap */
 501                         dsb->buf_mixpos %= dsb->buflen;
 502                         if (dsb->leadin && (dsb->startpos <= dsb->buf_mixpos))
 503                                 dsb->leadin = FALSE; /* HACK: see above */
 504                 }
 505         }
 506
 507         return len;
 508 }
 509
 510 static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD len)
 511 {
 512         INT     ilen, field, nBlockAlign;
 513         UINT    i, todo;
 514         BYTE    *buf, *ibuf;
 515
 516         TRACE("(%p,%ld,%ld)\n",dsb,writepos,len);
 517
 518         nBlockAlign = dsb->dsound->pwfx->nBlockAlign;
 519         len = len / nBlockAlign * nBlockAlign;  /* data alignment */
 520
 521         TRACE("allocating buffer (size = %ld)\n", len);
 522         if ((buf = ibuf = (BYTE *) DSOUND_tmpbuffer(len)) == NULL)
 523                 return;
 524
 525         TRACE("PhaseCancel (%p) len = %ld, dest = %ld\n", dsb, len, writepos);
 526
 527         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 528         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 529             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 530             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 531                 DSOUND_MixerVol(dsb, ibuf, len);
 532
 533         /* subtract instead of add, to phase out premixed data */
 534         if (dsb->dsound->pwfx->wBitsPerSample == 8) {
 535                 BYTE    *obuf = dsb->dsound->buffer + writepos;
 536
 537                 if ((writepos + len) <= dsb->dsound->buflen)
 538                         todo = len;
 539                 else
 540                         todo = dsb->dsound->buflen - writepos;
 541
 542                 for (i = 0; i < todo; i++) {
 543                         /* 8-bit WAV is unsigned */
 544                         field = (*ibuf++ - 128);
 545                         field -= (*obuf - 128);
 546                         if (field > 127) field = 127;
 547                         else if (field < -128) field = -128;
 548                         *obuf++ = field + 128;
 549                 }
 550
 551                 if (todo < len) {
 552                         todo = len - todo;
 553                         obuf = dsb->dsound->buffer;
 554
 555                         for (i = 0; i < todo; i++) {
 556                                 /* 8-bit WAV is unsigned */
 557                                 field = (*ibuf++ - 128);
 558                                 field -= (*obuf - 128);
 559                                 if (field > 127) field = 127;
 560                                 else if (field < -128) field = -128;
 561                                 *obuf++ = field + 128;
 562                         }
 563                 }
 564         } else {
 565                 INT16   *ibufs, *obufs;
 566
 567                 ibufs = (INT16 *) ibuf;
 568                 obufs = (INT16 *)(dsb->dsound->buffer + writepos);
 569
 570                 if ((writepos + len) <= dsb->dsound->buflen)
 571                         todo = len / 2;
 572                 else
 573                         todo = (dsb->dsound->buflen - writepos) / 2;
 574
 575                 for (i = 0; i < todo; i++) {
 576                         /* 16-bit WAV is signed */
 577                         field = *ibufs++;
 578                         field -= *obufs;
 579                         if (field > 32767) field = 32767;
 580                         else if (field < -32768) field = -32768;
 581                         *obufs++ = field;
 582                 }
 583
 584                 if (todo < (len / 2)) {
 585                         todo = (len / 2) - todo;
 586                         obufs = (INT16 *)dsb->dsound->buffer;
 587
 588                         for (i = 0; i < todo; i++) {
 589                                 /* 16-bit WAV is signed */
 590                                 field = *ibufs++;
 591                                 field -= *obufs;
 592                                 if (field > 32767) field = 32767;
 593                                 else if (field < -32768) field = -32768;
 594                                 *obufs++ = field;
 595                         }
 596                 }
 597         }
 598 }
 599
 600 static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)
 601 {
 602         DWORD   size, flen, len, npos, nlen;
 603         INT     iAdvance = dsb->pwfx->nBlockAlign;
 604         INT     oAdvance = dsb->dsound->pwfx->nBlockAlign;
 605         /* determine amount of premixed data to cancel */
 606         DWORD primary_done =
 607                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
 608                 dsb->primary_mixpos - writepos;
 609
 610         TRACE("(%p, %ld), buf_mixpos=%ld\n", dsb, writepos, dsb->buf_mixpos);
 611
 612         /* backtrack the mix position */
 613         size = primary_done / oAdvance;
 614         flen = size * dsb->freqAdjust;
 615         len = (flen >> DSOUND_FREQSHIFT) * iAdvance;
 616         flen &= (1<<DSOUND_FREQSHIFT)-1;
 617         while (dsb->freqAcc < flen) {
 618                 len += iAdvance;
 619                 dsb->freqAcc += 1<<DSOUND_FREQSHIFT;
 620         }
 621         len %= dsb->buflen;
 622         npos = ((dsb->buf_mixpos < len) ? dsb->buflen : 0) +
 623                 dsb->buf_mixpos - len;
 624         if (dsb->leadin && (dsb->startpos > npos) && (dsb->startpos <= npos + len)) {
 625                 /* stop backtracking at startpos */
 626                 npos = dsb->startpos;
 627                 len = ((dsb->buf_mixpos < npos) ? dsb->buflen : 0) +
 628                         dsb->buf_mixpos - npos;
 629                 flen = dsb->freqAcc;
 630                 nlen = len / dsb->pwfx->nBlockAlign;
 631                 nlen = ((nlen << DSOUND_FREQSHIFT) + flen) / dsb->freqAdjust;
 632                 nlen *= dsb->dsound->pwfx->nBlockAlign;
 633                 writepos =
 634                         ((dsb->primary_mixpos < nlen) ? dsb->dsound->buflen : 0) +
 635                         dsb->primary_mixpos - nlen;
 636         }
 637
 638         dsb->freqAcc -= flen;
 639         dsb->buf_mixpos = npos;
 640         dsb->primary_mixpos = writepos;
 641
 642         TRACE("new buf_mixpos=%ld, primary_mixpos=%ld (len=%ld)\n",
 643               dsb->buf_mixpos, dsb->primary_mixpos, len);
 644
 645         if (cancel) DSOUND_PhaseCancel(dsb, writepos, len);
 646 }
 647
 648 void DSOUND_MixCancelAt(IDirectSoundBufferImpl *dsb, DWORD buf_writepos)
 649 {
 650 #if 0
 651         DWORD   i, size, flen, len, npos, nlen;
 652         INT     iAdvance = dsb->pwfx->nBlockAlign;
 653         INT     oAdvance = dsb->dsound->pwfx->nBlockAlign;
 654         /* determine amount of premixed data to cancel */
 655         DWORD buf_done =
 656                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 657                 dsb->buf_mixpos - buf_writepos;
 658 #endif
 659
 660         WARN("(%p, %ld), buf_mixpos=%ld\n", dsb, buf_writepos, dsb->buf_mixpos);
 661         /* since this is not implemented yet, just cancel *ALL* prebuffering for now
 662          * (which is faster anyway when there's only a single secondary buffer) */
 663         dsb->dsound->need_remix = TRUE;
 664 }
 665
 666 void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
 667 {
 668         TRACE("(%p)\n",dsb);
 669         EnterCriticalSection(&dsb->lock);
 670         if (dsb->state == STATE_PLAYING) {
 671 #if 0 /* this may not be quite reliable yet */
 672                 dsb->need_remix = TRUE;
 673 #else
 674                 dsb->dsound->need_remix = TRUE;
 675 #endif
 676         }
 677         LeaveCriticalSection(&dsb->lock);
 678 }
 679
 680 static DWORD DSOUND_MixOne(IDirectSoundBufferImpl *dsb, DWORD playpos, DWORD writepos, DWORD mixlen)
 681 {
 682         DWORD len, slen;
 683         /* determine this buffer's write position */
 684         DWORD buf_writepos = DSOUND_CalcPlayPosition(dsb, dsb->state & dsb->dsound->state, writepos,
 685                                                      writepos, dsb->primary_mixpos, dsb->buf_mixpos);
 686         /* determine how much already-mixed data exists */
 687         DWORD buf_done =
 688                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 689                 dsb->buf_mixpos - buf_writepos;
 690         DWORD primary_done =
 691                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
 692                 dsb->primary_mixpos - writepos;
 693         DWORD adv_done =
 694                 ((dsb->dsound->mixpos < writepos) ? dsb->dsound->buflen : 0) +
 695                 dsb->dsound->mixpos - writepos;
 696         DWORD played =
 697                 ((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
 698                 buf_writepos - dsb->playpos;
 699         DWORD buf_left = dsb->buflen - buf_writepos;
 700         int still_behind;
 701
 702         TRACE("(%p,%ld,%ld,%ld)\n",dsb,playpos,writepos,mixlen);
 703         TRACE("buf_writepos=%ld, primary_writepos=%ld\n", buf_writepos, writepos);
 704         TRACE("buf_done=%ld, primary_done=%ld\n", buf_done, primary_done);
 705         TRACE("buf_mixpos=%ld, primary_mixpos=%ld, mixlen=%ld\n", dsb->buf_mixpos, dsb->primary_mixpos,
 706               mixlen);
 707         TRACE("looping=%ld, startpos=%ld, leadin=%ld\n", dsb->playflags, dsb->startpos, dsb->leadin);
 708
 709         /* check for notification positions */
 710         if (dsb->dsbd.dwFlags & DSBCAPS_CTRLPOSITIONNOTIFY &&
 711             dsb->state != STATE_STARTING) {
 712                 DSOUND_CheckEvent(dsb, played);
 713         }
 714
 715         /* save write position for non-GETCURRENTPOSITION2... */
 716         dsb->playpos = buf_writepos;
 717
 718         /* check whether CalcPlayPosition detected a mixing underrun */
 719         if ((buf_done == 0) && (dsb->primary_mixpos != writepos)) {
 720                 /* it did, but did we have more to play? */
 721                 if ((dsb->playflags & DSBPLAY_LOOPING) ||
 722                     (dsb->buf_mixpos < dsb->buflen)) {
 723                         /* yes, have to recover */
 724                         ERR("underrun on sound buffer %p\n", dsb);
 725                         TRACE("recovering from underrun: primary_mixpos=%ld\n", writepos);
 726                 }
 727                 dsb->primary_mixpos = writepos;
 728                 primary_done = 0;
 729         }
 730         /* determine how far ahead we should mix */
 731         if (((dsb->playflags & DSBPLAY_LOOPING) ||
 732              (dsb->leadin && (dsb->probably_valid_to != 0))) &&
 733             !(dsb->dsbd.dwFlags & DSBCAPS_STATIC)) {
 734                 /* if this is a streaming buffer, it typically means that
 735                  * we should defer mixing past probably_valid_to as long
 736                  * as we can, to avoid unnecessary remixing */
 737                 /* the heavy-looking calculations shouldn't be that bad,
 738                  * as any game isn't likely to be have more than 1 or 2
 739                  * streaming buffers in use at any time anyway... */
 740                 DWORD probably_valid_left =
 741                         (dsb->probably_valid_to == (DWORD)-1) ? dsb->buflen :
 742                         ((dsb->probably_valid_to < buf_writepos) ? dsb->buflen : 0) +
 743                         dsb->probably_valid_to - buf_writepos;
 744                 /* check for leadin condition */
 745                 if ((probably_valid_left == 0) &&
 746                     (dsb->probably_valid_to == dsb->startpos) &&
 747                     dsb->leadin)
 748                         probably_valid_left = dsb->buflen;
 749                 TRACE("streaming buffer probably_valid_to=%ld, probably_valid_left=%ld\n",
 750                       dsb->probably_valid_to, probably_valid_left);
 751                 /* check whether the app's time is already up */
 752                 if (probably_valid_left < dsb->writelead) {
 753                         WARN("probably_valid_to now within writelead, possible streaming underrun\n");
 754                         /* once we pass the point of no return,
 755                          * no reason to hold back anymore */
 756                         dsb->probably_valid_to = (DWORD)-1;
 757                         /* we just have to go ahead and mix what we have,
 758                          * there's no telling what the app is thinking anyway */
 759                 } else {
 760                         /* adjust for our frequency and our sample size */
 761                         probably_valid_left = MulDiv(probably_valid_left,
 762                                                      1 << DSOUND_FREQSHIFT,
 763                                                      dsb->pwfx->nBlockAlign * dsb->freqAdjust) *
 764                                               dsb->dsound->pwfx->nBlockAlign;
 765                         /* check whether to clip mix_len */
 766                         if (probably_valid_left < mixlen) {
 767                                 TRACE("clipping to probably_valid_left=%ld\n", probably_valid_left);
 768                                 mixlen = probably_valid_left;
 769                         }
 770                 }
 771         }
 772         /* cut mixlen with what's already been mixed */
 773         if (mixlen < primary_done) {
 774                 /* huh? and still CalcPlayPosition didn't
 775                  * detect an underrun? */
 776                 FIXME("problem with underrun detection (mixlen=%ld < primary_done=%ld)\n", mixlen, primary_done);
 777                 return 0;
 778         }
 779         len = mixlen - primary_done;
 780         TRACE("remaining mixlen=%ld\n", len);
 781
 782         if (len < dsb->dsound->fraglen) {
 783                 /* smaller than a fragment, wait until it gets larger
 784                  * before we take the mixing overhead */
 785                 TRACE("mixlen not worth it, deferring mixing\n");
 786                 still_behind = 1;
 787                 goto post_mix;
 788         }
 789
 790         /* ok, we know how much to mix, let's go */
 791         still_behind = (adv_done > primary_done);
 792         while (len) {
 793                 slen = dsb->dsound->buflen - dsb->primary_mixpos;
 794                 if (slen > len) slen = len;
 795                 slen = DSOUND_MixInBuffer(dsb, dsb->primary_mixpos, slen);
 796
 797                 if ((dsb->primary_mixpos < dsb->dsound->mixpos) &&
 798                     (dsb->primary_mixpos + slen >= dsb->dsound->mixpos))
 799                         still_behind = FALSE;
 800
 801                 dsb->primary_mixpos += slen; len -= slen;
 802                 dsb->primary_mixpos %= dsb->dsound->buflen;
 803
 804                 if ((dsb->state == STATE_STOPPED) || !slen) break;
 805         }
 806         TRACE("new primary_mixpos=%ld, primary_advbase=%ld\n", dsb->primary_mixpos, dsb->dsound->mixpos);
 807         TRACE("mixed data len=%ld, still_behind=%d\n", mixlen-len, still_behind);
 808
 809 post_mix:
 810         /* check if buffer should be considered complete */
 811         if (buf_left < dsb->writelead &&
 812             !(dsb->playflags & DSBPLAY_LOOPING)) {
 813                 dsb->state = STATE_STOPPED;
 814                 dsb->playpos = 0;
 815                 dsb->last_playpos = 0;
 816                 dsb->buf_mixpos = 0;
 817                 dsb->leadin = FALSE;
 818                 DSOUND_CheckEvent(dsb, buf_left);
 819         }
 820
 821         /* return how far we think the primary buffer can
 822          * advance its underrun detector...*/
 823         if (still_behind) return 0;
 824         if ((mixlen - len) < primary_done) return 0;
 825         slen = ((dsb->primary_mixpos < dsb->dsound->mixpos) ?
 826                 dsb->dsound->buflen : 0) + dsb->primary_mixpos -
 827                 dsb->dsound->mixpos;
 828         if (slen > mixlen) {
 829                 /* the primary_done and still_behind checks above should have worked */
 830                 FIXME("problem with advancement calculation (advlen=%ld > mixlen=%ld)\n", slen, mixlen);
 831                 slen = 0;
 832         }
 833         return slen;
 834 }
 835
 836 static DWORD DSOUND_MixToPrimary(IDirectSoundImpl *dsound, DWORD playpos, DWORD writepos, DWORD mixlen, BOOL recover)
 837 {
 838         INT                     i, len, maxlen = 0;
 839         IDirectSoundBufferImpl  *dsb;
 840
 841         TRACE("(%ld,%ld,%ld,%d)\n", playpos, writepos, mixlen, recover);
 842         for (i = 0; i < dsound->nrofbuffers; i++) {
 843                 dsb = dsound->buffers[i];
 844
 845                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 846                         TRACE("Checking %p, mixlen=%ld\n", dsb, mixlen);
 847                         EnterCriticalSection(&(dsb->lock));
 848                         if (dsb->state == STATE_STOPPING) {
 849                                 DSOUND_MixCancel(dsb, writepos, TRUE);
 850                                 dsb->state = STATE_STOPPED;
 851                                 DSOUND_CheckEvent(dsb, 0);
 852                         } else {
 853                                 if ((dsb->state == STATE_STARTING) || recover) {
 854                                         dsb->primary_mixpos = writepos;
 855                                         dsb->cvolpan = dsb->volpan;
 856                                         dsb->need_remix = FALSE;
 857                                 }
 858                                 else if (dsb->need_remix) {
 859                                         DSOUND_MixCancel(dsb, writepos, TRUE);
 860                                         dsb->cvolpan = dsb->volpan;
 861                                         dsb->need_remix = FALSE;
 862                                 }
 863                                 len = DSOUND_MixOne(dsb, playpos, writepos, mixlen);
 864                                 if (dsb->state == STATE_STARTING)
 865                                         dsb->state = STATE_PLAYING;
 866                                 maxlen = (len > maxlen) ? len : maxlen;
 867                         }
 868                         LeaveCriticalSection(&(dsb->lock));
 869                 }
 870         }
 871
 872         return maxlen;
 873 }
 874
 875 static void DSOUND_MixReset(IDirectSoundImpl *dsound, DWORD writepos)
 876 {
 877         INT                     i;
 878         IDirectSoundBufferImpl  *dsb;
 879         int nfiller;
 880
 881         TRACE("(%ld)\n", writepos);
 882
 883         /* the sound of silence */
 884         nfiller = dsound->pwfx->wBitsPerSample == 8 ? 128 : 0;
 885
 886         /* reset all buffer mix positions */
 887         for (i = 0; i < dsound->nrofbuffers; i++) {
 888                 dsb = dsound->buffers[i];
 889
 890                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 891                         TRACE("Resetting %p\n", dsb);
 892                         EnterCriticalSection(&(dsb->lock));
 893                         if (dsb->state == STATE_STOPPING) {
 894                                 dsb->state = STATE_STOPPED;
 895                         }
 896                         else if (dsb->state == STATE_STARTING) {
 897                                 /* nothing */
 898                         } else {
 899                                 DSOUND_MixCancel(dsb, writepos, FALSE);
 900                                 dsb->cvolpan = dsb->volpan;
 901                                 dsb->need_remix = FALSE;
 902                         }
 903                         LeaveCriticalSection(&(dsb->lock));
 904                 }
 905         }
 906
 907         /* wipe out premixed data */
 908         if (dsound->mixpos < writepos) {
 909                 memset(dsound->buffer + writepos, nfiller, dsound->buflen - writepos);
 910                 memset(dsound->buffer, nfiller, dsound->mixpos);
 911         } else {
 912                 memset(dsound->buffer + writepos, nfiller, dsound->mixpos - writepos);
 913         }
 914
 915         /* reset primary mix position */
 916         dsound->mixpos = writepos;
 917 }
 918
 919 static void DSOUND_CheckReset(IDirectSoundImpl *dsound, DWORD writepos)
 920 {
 921         TRACE("(%p,%ld)\n",dsound,writepos);
 922         if (dsound->need_remix) {
 923                 DSOUND_MixReset(dsound, writepos);
 924                 dsound->need_remix = FALSE;
 925                 /* maximize Half-Life performance */
 926                 dsound->prebuf = ds_snd_queue_min;
 927                 dsound->precount = 0;
 928         } else {
 929                 dsound->precount++;
 930                 if (dsound->precount >= 4) {
 931                         if (dsound->prebuf < ds_snd_queue_max)
 932                                 dsound->prebuf++;
 933                         dsound->precount = 0;
 934                 }
 935         }
 936         TRACE("premix adjust: %d\n", dsound->prebuf);
 937 }
 938
 939 void DSOUND_WaveQueue(IDirectSoundImpl *dsound, DWORD mixq)
 940 {
 941         TRACE("(%p,%ld)\n",dsound,mixq);
 942         if (mixq + dsound->pwqueue > ds_hel_queue) mixq = ds_hel_queue - dsound->pwqueue;
 943         TRACE("queueing %ld buffers, starting at %d\n", mixq, dsound->pwwrite);
 944         for (; mixq; mixq--) {
 945                 waveOutWrite(dsound->hwo, dsound->pwave[dsound->pwwrite], sizeof(WAVEHDR));
 946                 dsound->pwwrite++;
 947                 if (dsound->pwwrite >= DS_HEL_FRAGS) dsound->pwwrite = 0;
 948                 dsound->pwqueue++;
 949         }
 950 }
 951
 952 /* #define SYNC_CALLBACK */
 953
 954 void DSOUND_PerformMix(IDirectSoundImpl *dsound)
 955 {
 956         int nfiller;
 957         BOOL forced;
 958         HRESULT hres;
 959
 960         TRACE("(%p)\n", dsound);
 961
 962         /* the sound of silence */
 963         nfiller = dsound->pwfx->wBitsPerSample == 8 ? 128 : 0;
 964
 965         /* whether the primary is forced to play even without secondary buffers */
 966         forced = ((dsound->state == STATE_PLAYING) || (dsound->state == STATE_STARTING));
 967
 968         if (dsound->priolevel != DSSCL_WRITEPRIMARY) {
 969                 BOOL paused = ((dsound->state == STATE_STOPPED) || (dsound->state == STATE_STARTING));
 970                 /* FIXME: document variables */
 971                 DWORD playpos, writepos, inq, maxq, frag;
 972                 if (dsound->hwbuf) {
 973                         hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, &writepos);
 974                         if (hres) {
 975                             WARN("IDsDriverBuffer_GetPosition failed\n");
 976                             return;
 977                         }
 978                         /* Well, we *could* do Just-In-Time mixing using the writepos,
 979                          * but that's a little bit ambitious and unnecessary... */
 980                         /* rather add our safety margin to the writepos, if we're playing */
 981                         if (!paused) {
 982                                 writepos += dsound->writelead;
 983                                 writepos %= dsound->buflen;
 984                         } else writepos = playpos;
 985                 } else {
 986                         playpos = dsound->pwplay * dsound->fraglen;
 987                         writepos = playpos;
 988                         if (!paused) {
 989                                 writepos += ds_hel_margin * dsound->fraglen;
 990                                 writepos %= dsound->buflen;
 991                         }
 992                 }
 993                 TRACE("primary playpos=%ld, writepos=%ld, clrpos=%ld, mixpos=%ld, buflen=%ld\n",
 994                       playpos,writepos,dsound->playpos,dsound->mixpos,dsound->buflen);
 995                 assert(dsound->playpos < dsound->buflen);
 996                 /* wipe out just-played sound data */
 997                 if (playpos < dsound->playpos) {
 998                         memset(dsound->buffer + dsound->playpos, nfiller, dsound->buflen - dsound->playpos);
 999                         memset(dsound->buffer, nfiller, playpos);
1000                 } else {
1001                         memset(dsound->buffer + dsound->playpos, nfiller, playpos - dsound->playpos);
1002                 }
1003                 dsound->playpos = playpos;
1004
1005                 EnterCriticalSection(&(dsound->mixlock));
1006
1007                 /* reset mixing if necessary */
1008                 DSOUND_CheckReset(dsound, writepos);
1009
1010                 /* check how much prebuffering is left */
1011                 inq = dsound->mixpos;
1012                 if (inq < writepos)
1013                         inq += dsound->buflen;
1014                 inq -= writepos;
1015
1016                 /* find the maximum we can prebuffer */
1017                 if (!paused) {
1018                         maxq = playpos;
1019                         if (maxq < writepos)
1020                                 maxq += dsound->buflen;
1021                         maxq -= writepos;
1022                 } else maxq = dsound->buflen;
1023
1024                 /* clip maxq to dsound->prebuf */
1025                 frag = dsound->prebuf * dsound->fraglen;
1026                 if (maxq > frag) maxq = frag;
1027
1028                 /* check for consistency */
1029                 if (inq > maxq) {
1030                         /* the playback position must have passed our last
1031                          * mixed position, i.e. it's an underrun, or we have
1032                          * nothing more to play */
1033                         TRACE("reached end of mixed data (inq=%ld, maxq=%ld)\n", inq, maxq);
1034                         inq = 0;
1035                         /* stop the playback now, to allow buffers to refill */
1036                         if (dsound->state == STATE_PLAYING) {
1037                                 dsound->state = STATE_STARTING;
1038                         }
1039                         else if (dsound->state == STATE_STOPPING) {
1040                                 dsound->state = STATE_STOPPED;
1041                         }
1042                         else {
1043                                 /* how can we have an underrun if we aren't playing? */
1044                                 WARN("unexpected primary state (%ld)\n", dsound->state);
1045                         }
1046 #ifdef SYNC_CALLBACK
1047                         /* DSOUND_callback may need this lock */
1048                         LeaveCriticalSection(&(dsound->mixlock));
1049 #endif
1050                         if (DSOUND_PrimaryStop(dsound) != DS_OK)
1051                                 WARN("DSOUND_PrimaryStop failed\n");
1052 #ifdef SYNC_CALLBACK
1053                         EnterCriticalSection(&(dsound->mixlock));
1054 #endif
1055                         if (dsound->hwbuf) {
1056                                 /* the Stop is supposed to reset play position to beginning of buffer */
1057                                 /* unfortunately, OSS is not able to do so, so get current pointer */
1058                                 hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, NULL);
1059                                 if (hres) {
1060                                         LeaveCriticalSection(&(dsound->mixlock));
1061                                         WARN("IDsDriverBuffer_GetPosition failed\n");
1062                                         return;
1063                                 }
1064                         } else {
1065                                 playpos = dsound->pwplay * dsound->fraglen;
1066                         }
1067                         writepos = playpos;
1068                         dsound->playpos = playpos;
1069                         dsound->mixpos = writepos;
1070                         inq = 0;
1071                         maxq = dsound->buflen;
1072                         if (maxq > frag) maxq = frag;
1073                         memset(dsound->buffer, nfiller, dsound->buflen);
1074                         paused = TRUE;
1075                 }
1076
1077                 /* do the mixing */
1078                 frag = DSOUND_MixToPrimary(dsound, playpos, writepos, maxq, paused);
1079                 if (forced) frag = maxq - inq;
1080                 dsound->mixpos += frag;
1081                 dsound->mixpos %= dsound->buflen;
1082
1083                 if (frag) {
1084                         /* buffers have been filled, restart playback */
1085                         if (dsound->state == STATE_STARTING) {
1086                                 dsound->state = STATE_PLAYING;
1087                         }
1088                         else if (dsound->state == STATE_STOPPED) {
1089                                 /* the dsound is supposed to play if there's something to play
1090                                  * even if it is reported as stopped, so don't let this confuse you */
1091                                 dsound->state = STATE_STOPPING;
1092                         }
1093                         LeaveCriticalSection(&(dsound->mixlock));
1094                         if (paused) {
1095                                 if (DSOUND_PrimaryPlay(dsound) != DS_OK)
1096                                         WARN("DSOUND_PrimaryPlay failed\n");
1097                                 else
1098                                         TRACE("starting playback\n");
1099                         }
1100                 }
1101                 else
1102                         LeaveCriticalSection(&(dsound->mixlock));
1103         } else {
1104                 /* in the DSSCL_WRITEPRIMARY mode, the app is totally in charge... */
1105                 if (dsound->state == STATE_STARTING) {
1106                         if (DSOUND_PrimaryPlay(dsound) != DS_OK)
1107                                 WARN("DSOUND_PrimaryPlay failed\n");
1108                         else
1109                                 dsound->state = STATE_PLAYING;
1110                 }
1111                 else if (dsound->state == STATE_STOPPING) {
1112                         if (DSOUND_PrimaryStop(dsound) != DS_OK)
1113                                 WARN("DSOUND_PrimaryStop failed\n");
1114                         else
1115                                 dsound->state = STATE_STOPPED;
1116                 }
1117         }
1118 }
1119
1120 void CALLBACK DSOUND_timer(UINT timerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1121 {
1122         IDirectSoundImpl* This = (IDirectSoundImpl*)dwUser;
1123         DWORD start_time =  GetTickCount();
1124         DWORD end_time;
1125         TRACE("(%d,%d,0x%lx,0x%lx,0x%lx)\n",timerID,msg,dwUser,dw1,dw2);
1126         TRACE("entering at %ld\n", start_time);
1127
1128         if (dsound != This) {
1129                 ERR("dsound died without killing us?\n");
1130                 timeKillEvent(timerID);
1131                 timeEndPeriod(DS_TIME_RES);
1132                 return;
1133         }
1134
1135         RtlAcquireResourceShared(&(This->buffer_list_lock), TRUE);
1136
1137         if (This->ref)
1138                 DSOUND_PerformMix(This);
1139
1140         RtlReleaseResource(&(This->buffer_list_lock));
1141
1142         end_time = GetTickCount();
1143         TRACE("completed processing at %ld, duration = %ld\n", end_time, end_time - start_time);
1144 }
1145
1146 void CALLBACK DSOUND_callback(HWAVEOUT hwo, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1147 {
1148         IDirectSoundImpl* This = (IDirectSoundImpl*)dwUser;
1149         TRACE("(%p,%x,%lx,%lx,%lx)\n",hwo,msg,dwUser,dw1,dw2);
1150         TRACE("entering at %ld, msg=%08x(%s)\n", GetTickCount(), msg,
1151                 msg==MM_WOM_DONE ? "MM_WOM_DONE" : msg==MM_WOM_CLOSE ? "MM_WOM_CLOSE" :
1152                 msg==MM_WOM_OPEN ? "MM_WOM_OPEN" : "UNKNOWN");
1153         if (msg == MM_WOM_DONE) {
1154                 DWORD inq, mixq, fraglen, buflen, pwplay, playpos, mixpos;
1155                 if (This->pwqueue == (DWORD)-1) {
1156                         TRACE("completed due to reset\n");
1157                         return;
1158                 }
1159 /* it could be a bad idea to enter critical section here... if there's lock contention,
1160  * the resulting scheduling delays might obstruct the winmm player thread */
1161 #ifdef SYNC_CALLBACK
1162                 EnterCriticalSection(&(This->mixlock));
1163 #endif
1164                 /* retrieve current values */
1165                 fraglen = This->fraglen;
1166                 buflen = This->buflen;
1167                 pwplay = This->pwplay;
1168                 playpos = pwplay * fraglen;
1169                 mixpos = This->mixpos;
1170                 /* check remaining mixed data */
1171                 inq = ((mixpos < playpos) ? buflen : 0) + mixpos - playpos;
1172                 mixq = inq / fraglen;
1173                 if ((inq - (mixq * fraglen)) > 0) mixq++;
1174                 /* complete the playing buffer */
1175                 TRACE("done playing primary pos=%ld\n", playpos);
1176                 pwplay++;
1177                 if (pwplay >= DS_HEL_FRAGS) pwplay = 0;
1178                 /* write new values */
1179                 This->pwplay = pwplay;
1180                 This->pwqueue--;
1181                 /* queue new buffer if we have data for it */
1182                 if (inq>1) DSOUND_WaveQueue(This, inq-1);
1183 #ifdef SYNC_CALLBACK
1184                 LeaveCriticalSection(&(This->mixlock));
1185 #endif
1186         }
1187         TRACE("completed\n");
1188 }