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