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