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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 "winuser.h"
  31 #include "mmsystem.h"
  32 #include "winreg.h"
  33 #include "winternl.h"
  34 #include "wine/debug.h"
  35 #include "dsound.h"
  36 #include "dsdriver.h"
  37 #include "dsound_private.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(dsound);
  40
  41 void DSOUND_RecalcVolPan(PDSVOLUMEPAN volpan)
  42 {
  43         double temp;
  44         TRACE("(%p)\n",volpan);
  45
  46         TRACE("Vol=%ld Pan=%ld\n", volpan->lVolume, volpan->lPan);
  47         /* the AmpFactors are expressed in 16.16 fixed point */
  48         volpan->dwVolAmpFactor = (ULONG) (pow(2.0, volpan->lVolume / 600.0) * 0xffff);
  49         /* FIXME: dwPan{Left|Right}AmpFactor */
  50
  51         /* FIXME: use calculated vol and pan ampfactors */
  52         temp = (double) (volpan->lVolume - (volpan->lPan > 0 ? volpan->lPan : 0));
  53         volpan->dwTotalLeftAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 0xffff);
  54         temp = (double) (volpan->lVolume + (volpan->lPan < 0 ? volpan->lPan : 0));
  55         volpan->dwTotalRightAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 0xffff);
  56
  57         TRACE("left = %lx, right = %lx\n", volpan->dwTotalLeftAmpFactor, volpan->dwTotalRightAmpFactor);
  58 }
  59
  60 void DSOUND_AmpFactorToVolPan(PDSVOLUMEPAN volpan)
  61 {
  62     double left,right;
  63     TRACE("(%p)\n",volpan);
  64
  65     TRACE("left=%lx, right=%lx\n",volpan->dwTotalLeftAmpFactor,volpan->dwTotalRightAmpFactor);
  66     if (volpan->dwTotalLeftAmpFactor==0)
  67         left=-10000;
  68     else
  69         left=600 * log(((double)volpan->dwTotalLeftAmpFactor) / 0xffff) / log(2);
  70     if (volpan->dwTotalRightAmpFactor==0)
  71         right=-10000;
  72     else
  73         right=600 * log(((double)volpan->dwTotalRightAmpFactor) / 0xffff) / log(2);
  74     if (left<right)
  75     {
  76         volpan->lVolume=right;
  77         volpan->dwVolAmpFactor=volpan->dwTotalRightAmpFactor;
  78     }
  79     else
  80     {
  81         volpan->lVolume=left;
  82         volpan->dwVolAmpFactor=volpan->dwTotalLeftAmpFactor;
  83     }
  84     if (volpan->lVolume < -10000)
  85         volpan->lVolume=-10000;
  86     volpan->lPan=right-left;
  87     if (volpan->lPan < -10000)
  88         volpan->lPan=-10000;
  89
  90     TRACE("Vol=%ld Pan=%ld\n", volpan->lVolume, volpan->lPan);
  91 }
  92
  93 void DSOUND_RecalcFormat(IDirectSoundBufferImpl *dsb)
  94 {
  95         TRACE("(%p)\n",dsb);
  96
  97         /* calculate the 10ms write lead */
  98         dsb->writelead = (dsb->freq / 100) * dsb->pwfx->nBlockAlign;
  99 }
 100
 101 void DSOUND_CheckEvent(IDirectSoundBufferImpl *dsb, int len)
 102 {
 103         int                     i;
 104         DWORD                   offset;
 105         LPDSBPOSITIONNOTIFY     event;
 106         TRACE("(%p,%d)\n",dsb,len);
 107
 108         if (dsb->nrofnotifies == 0)
 109                 return;
 110
 111         TRACE("(%p) buflen = %ld, playpos = %ld, len = %d\n",
 112                 dsb, dsb->buflen, dsb->playpos, len);
 113         for (i = 0; i < dsb->nrofnotifies ; i++) {
 114                 event = dsb->notifies + i;
 115                 offset = event->dwOffset;
 116                 TRACE("checking %d, position %ld, event = %p\n",
 117                         i, offset, event->hEventNotify);
 118                 /* DSBPN_OFFSETSTOP has to be the last element. So this is */
 119                 /* OK. [Inside DirectX, p274] */
 120                 /*  */
 121                 /* This also means we can't sort the entries by offset, */
 122                 /* because DSBPN_OFFSETSTOP == -1 */
 123                 if (offset == DSBPN_OFFSETSTOP) {
 124                         if (dsb->state == STATE_STOPPED) {
 125                                 SetEvent(event->hEventNotify);
 126                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 127                                 return;
 128                         } else
 129                                 return;
 130                 }
 131                 if ((dsb->playpos + len) >= dsb->buflen) {
 132                         if ((offset < ((dsb->playpos + len) % dsb->buflen)) ||
 133                             (offset >= dsb->playpos)) {
 134                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 135                                 SetEvent(event->hEventNotify);
 136                         }
 137                 } else {
 138                         if ((offset >= dsb->playpos) && (offset < (dsb->playpos + len))) {
 139                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 140                                 SetEvent(event->hEventNotify);
 141                         }
 142                 }
 143         }
 144 }
 145
 146 /* WAV format info can be found at:
 147  *
 148  *    http://www.cwi.nl/ftp/audio/AudioFormats.part2
 149  *    ftp://ftp.cwi.nl/pub/audio/RIFF-format
 150  *
 151  * Import points to remember:
 152  *    8-bit WAV is unsigned
 153  *    16-bit WAV is signed
 154  */
 155  /* Use the same formulas as pcmconverter.c */
 156 static inline INT16 cvtU8toS16(BYTE b)
 157 {
 158     return (short)((b+(b << 8))-32768);
 159 }
 160
 161 static inline BYTE cvtS16toU8(INT16 s)
 162 {
 163     return (s >> 8) ^ (unsigned char)0x80;
 164 }
 165
 166 static inline void cp_fields(const IDirectSoundBufferImpl *dsb, BYTE *ibuf, BYTE *obuf )
 167 {
 168         DirectSoundDevice * device = dsb->device;
 169         INT fl,fr;
 170
 171         if (dsb->pwfx->wBitsPerSample == 8)  {
 172                 if (device->pwfx->wBitsPerSample == 8 &&
 173                     device->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 (device->pwfx->nChannels == 2) {
 188                 if (device->pwfx->wBitsPerSample == 8) {
 189                         *obuf = cvtS16toU8(fl);
 190                         *(obuf + 1) = cvtS16toU8(fr);
 191                         return;
 192                 }
 193                 if (device->pwfx->wBitsPerSample == 16) {
 194                         *((INT16 *)obuf) = fl;
 195                         *(((INT16 *)obuf) + 1) = fr;
 196                         return;
 197                 }
 198         }
 199         if (device->pwfx->nChannels == 1) {
 200                 fl = (fl + fr) >> 1;
 201                 if (device->pwfx->wBitsPerSample == 8) {
 202                         *obuf = cvtS16toU8(fl);
 203                         return;
 204                 }
 205                 if (device->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->device->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->device->pwfx->nSamplesPerSec) &&
 226             (dsb->pwfx->wBitsPerSample == dsb->device->pwfx->wBitsPerSample) &&
 227             (dsb->pwfx->nChannels == dsb->device->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->device->pwfx->nSamplesPerSec) {
 241                 TRACE("(%p) Same sample rate %ld = primary %ld\n", dsb,
 242                         dsb->freq, dsb->device->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->device->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->device->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->device->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->device->pwfx->nChannels);
 328                         break;
 329                 }
 330                 break;
 331         case 16:
 332                 /* 16-bit WAV is signed -- much better */
 333                 switch (dsb->device->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->device->pwfx->nChannels);
 350                         break;
 351                 }
 352                 break;
 353         default:
 354                 FIXME("doesn't support %d bit samples\n", dsb->device->pwfx->wBitsPerSample);
 355                 break;
 356         }
 357 }
 358
 359 static LPBYTE DSOUND_tmpbuffer(DirectSoundDevice *device, DWORD len)
 360 {
 361     TRACE("(%p,%ld)\n", device, len);
 362
 363     if (len > device->tmp_buffer_len) {
 364         if (device->tmp_buffer)
 365             device->tmp_buffer = HeapReAlloc(GetProcessHeap(), 0, device->tmp_buffer, len);
 366         else
 367             device->tmp_buffer = HeapAlloc(GetProcessHeap(), 0, len);
 368
 369         device->tmp_buffer_len = len;
 370     }
 371
 372     return device->tmp_buffer;
 373 }
 374
 375 static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD fraglen)
 376 {
 377         INT     i, len, ilen, field, 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 secondary_remainder = dsb->buflen - dsb->buf_mixpos;
 385                 int adjusted_remainder = MulDiv(dsb->device->pwfx->nAvgBytesPerSec, secondary_remainder, dsb->nAvgBytesPerSec);
 386                 assert(adjusted_remainder >= 0);
 387                 TRACE("secondary_remainder = %d, adjusted_remainder = %d, len = %d\n", secondary_remainder, adjusted_remainder, len);
 388                 if (adjusted_remainder < len) {
 389                         TRACE("clipping len to remainder of secondary buffer\n");
 390                         len = adjusted_remainder;
 391                 }
 392                 if (len == 0)
 393                         return 0;
 394         }
 395
 396         if (len % dsb->device->pwfx->nBlockAlign) {
 397                 INT nBlockAlign = dsb->device->pwfx->nBlockAlign;
 398                 ERR("length not a multiple of block size, len = %d, block size = %d\n", len, nBlockAlign);
 399                 len = (len / nBlockAlign) * nBlockAlign;        /* data alignment */
 400         }
 401
 402         if ((buf = ibuf = DSOUND_tmpbuffer(dsb->device, len)) == NULL)
 403                 return 0;
 404
 405         TRACE("MixInBuffer (%p) len = %d, dest = %ld\n", dsb, len, writepos);
 406
 407         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 408         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 409             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 410             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 411                 DSOUND_MixerVol(dsb, ibuf, len);
 412
 413         if (dsb->device->pwfx->wBitsPerSample == 8) {
 414                 BYTE    *obuf = dsb->device->buffer + writepos;
 415
 416                 if ((writepos + len) <= dsb->device->buflen)
 417                         todo = len;
 418                 else
 419                         todo = dsb->device->buflen - writepos;
 420
 421                 for (i = 0; i < todo; i++) {
 422                         /* 8-bit WAV is unsigned */
 423                         field = (*ibuf++ - 128);
 424                         field += (*obuf - 128);
 425                         if (field > 127) field = 127;
 426                         else if (field < -128) field = -128;
 427                         *obuf++ = field + 128;
 428                 }
 429
 430                 if (todo < len) {
 431                         todo = len - todo;
 432                         obuf = dsb->device->buffer;
 433
 434                         for (i = 0; i < todo; i++) {
 435                                 /* 8-bit WAV is unsigned */
 436                                 field = (*ibuf++ - 128);
 437                                 field += (*obuf - 128);
 438                                 if (field > 127) field = 127;
 439                                 else if (field < -128) field = -128;
 440                                 *obuf++ = field + 128;
 441                         }
 442                 }
 443         } else {
 444                 INT16   *ibufs, *obufs;
 445
 446                 ibufs = (INT16 *) ibuf;
 447                 obufs = (INT16 *)(dsb->device->buffer + writepos);
 448
 449                 if ((writepos + len) <= dsb->device->buflen)
 450                         todo = len / 2;
 451                 else
 452                         todo = (dsb->device->buflen - writepos) / 2;
 453
 454                 for (i = 0; i < todo; i++) {
 455                         /* 16-bit WAV is signed */
 456                         field = *ibufs++;
 457                         field += *obufs;
 458                         if (field > 32767) field = 32767;
 459                         else if (field < -32768) field = -32768;
 460                         *obufs++ = field;
 461                 }
 462
 463                 if (todo < (len / 2)) {
 464                         todo = (len / 2) - todo;
 465                         obufs = (INT16 *)dsb->device->buffer;
 466
 467                         for (i = 0; i < todo; i++) {
 468                                 /* 16-bit WAV is signed */
 469                                 field = *ibufs++;
 470                                 field += *obufs;
 471                                 if (field > 32767) field = 32767;
 472                                 else if (field < -32768) field = -32768;
 473                                 *obufs++ = field;
 474                         }
 475                 }
 476         }
 477
 478         if (dsb->leadin && (dsb->startpos > dsb->buf_mixpos) && (dsb->startpos <= dsb->buf_mixpos + ilen)) {
 479                 /* HACK... leadin should be reset when the PLAY position reaches the startpos,
 480                  * not the MIX position... but if the sound buffer is bigger than our prebuffering
 481                  * (which must be the case for the streaming buffers that need this hack anyway)
 482                  * plus DS_HEL_MARGIN or equivalent, then this ought to work anyway. */
 483                 dsb->leadin = FALSE;
 484         }
 485
 486         dsb->buf_mixpos += ilen;
 487
 488         if (dsb->buf_mixpos >= dsb->buflen) {
 489                 if (dsb->playflags & DSBPLAY_LOOPING) {
 490                         /* wrap */
 491                         dsb->buf_mixpos %= dsb->buflen;
 492                         if (dsb->leadin && (dsb->startpos <= dsb->buf_mixpos))
 493                                 dsb->leadin = FALSE; /* HACK: see above */
 494                 } else if (dsb->buf_mixpos > dsb->buflen) {
 495                         ERR("Mixpos (%lu) past buflen (%lu), capping...\n", dsb->buf_mixpos, dsb->buflen);
 496                         dsb->buf_mixpos = dsb->buflen;
 497                 }
 498         }
 499
 500         return len;
 501 }
 502
 503 static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD len)
 504 {
 505         INT     ilen, field;
 506         UINT    i, todo;
 507         BYTE    *buf, *ibuf;
 508
 509         TRACE("(%p,%ld,%ld)\n",dsb,writepos,len);
 510
 511         if (len % dsb->device->pwfx->nBlockAlign) {
 512                 INT nBlockAlign = dsb->device->pwfx->nBlockAlign;
 513                 ERR("length not a multiple of block size, len = %ld, block size = %d\n", len, nBlockAlign);
 514                 len = (len / nBlockAlign) * nBlockAlign;        /* data alignment */
 515         }
 516
 517         if ((buf = ibuf = DSOUND_tmpbuffer(dsb->device, len)) == NULL)
 518                 return;
 519
 520         TRACE("PhaseCancel (%p) len = %ld, dest = %ld\n", dsb, len, writepos);
 521
 522         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 523         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 524             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 525             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 526                 DSOUND_MixerVol(dsb, ibuf, len);
 527
 528         /* subtract instead of add, to phase out premixed data */
 529         if (dsb->device->pwfx->wBitsPerSample == 8) {
 530                 BYTE    *obuf = dsb->device->buffer + writepos;
 531
 532                 if ((writepos + len) <= dsb->device->buflen)
 533                         todo = len;
 534                 else
 535                         todo = dsb->device->buflen - writepos;
 536
 537                 for (i = 0; i < todo; i++) {
 538                         /* 8-bit WAV is unsigned */
 539                         field = (*obuf - 128);
 540                         field -= (*ibuf++ - 128);
 541                         if (field > 127) field = 127;
 542                         else if (field < -128) field = -128;
 543                         *obuf++ = field + 128;
 544                 }
 545
 546                 if (todo < len) {
 547                         todo = len - todo;
 548                         obuf = dsb->device->buffer;
 549
 550                         for (i = 0; i < todo; i++) {
 551                                 /* 8-bit WAV is unsigned */
 552                                 field = (*obuf - 128);
 553                                 field -= (*ibuf++ - 128);
 554                                 if (field > 127) field = 127;
 555                                 else if (field < -128) field = -128;
 556                                 *obuf++ = field + 128;
 557                         }
 558                 }
 559         } else {
 560                 INT16   *ibufs, *obufs;
 561
 562                 ibufs = (INT16 *) ibuf;
 563                 obufs = (INT16 *)(dsb->device->buffer + writepos);
 564
 565                 if ((writepos + len) <= dsb->device->buflen)
 566                         todo = len / 2;
 567                 else
 568                         todo = (dsb->device->buflen - writepos) / 2;
 569
 570                 for (i = 0; i < todo; i++) {
 571                         /* 16-bit WAV is signed */
 572                         field = *obufs;
 573                         field -= *ibufs++;
 574                         if (field > 32767) field = 32767;
 575                         else if (field < -32768) field = -32768;
 576                         *obufs++ = field;
 577                 }
 578
 579                 if (todo < (len / 2)) {
 580                         todo = (len / 2) - todo;
 581                         obufs = (INT16 *)dsb->device->buffer;
 582
 583                         for (i = 0; i < todo; i++) {
 584                                 /* 16-bit WAV is signed */
 585                                 field = *obufs;
 586                                 field -= *ibufs++;
 587                                 if (field > 32767) field = 32767;
 588                                 else if (field < -32768) field = -32768;
 589                                 *obufs++ = field;
 590                         }
 591                 }
 592         }
 593 }
 594
 595 static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)
 596 {
 597         DWORD   size, flen, len, npos, nlen;
 598         INT     iAdvance = dsb->pwfx->nBlockAlign;
 599         INT     oAdvance = dsb->device->pwfx->nBlockAlign;
 600         /* determine amount of premixed data to cancel */
 601         DWORD primary_done =
 602                 ((dsb->primary_mixpos < writepos) ? dsb->device->buflen : 0) +
 603                 dsb->primary_mixpos - writepos;
 604
 605         TRACE("(%p, %ld), buf_mixpos=%ld\n", dsb, writepos, dsb->buf_mixpos);
 606
 607         /* backtrack the mix position */
 608         size = primary_done / oAdvance;
 609         flen = size * dsb->freqAdjust;
 610         len = (flen >> DSOUND_FREQSHIFT) * iAdvance;
 611         flen &= (1<<DSOUND_FREQSHIFT)-1;
 612         while (dsb->freqAcc < flen) {
 613                 len += iAdvance;
 614                 dsb->freqAcc += 1<<DSOUND_FREQSHIFT;
 615         }
 616         len %= dsb->buflen;
 617         npos = ((dsb->buf_mixpos < len) ? dsb->buflen : 0) +
 618                 dsb->buf_mixpos - len;
 619         if (dsb->leadin && (dsb->startpos > npos) && (dsb->startpos <= npos + len)) {
 620                 /* stop backtracking at startpos */
 621                 npos = dsb->startpos;
 622                 len = ((dsb->buf_mixpos < npos) ? dsb->buflen : 0) +
 623                         dsb->buf_mixpos - npos;
 624                 flen = dsb->freqAcc;
 625                 nlen = len / dsb->pwfx->nBlockAlign;
 626                 nlen = ((nlen << DSOUND_FREQSHIFT) + flen) / dsb->freqAdjust;
 627                 nlen *= dsb->device->pwfx->nBlockAlign;
 628                 writepos =
 629                         ((dsb->primary_mixpos < nlen) ? dsb->device->buflen : 0) +
 630                         dsb->primary_mixpos - nlen;
 631         }
 632
 633         dsb->freqAcc -= flen;
 634         dsb->buf_mixpos = npos;
 635         dsb->primary_mixpos = writepos;
 636
 637         TRACE("new buf_mixpos=%ld, primary_mixpos=%ld (len=%ld)\n",
 638               dsb->buf_mixpos, dsb->primary_mixpos, len);
 639
 640         if (cancel) DSOUND_PhaseCancel(dsb, writepos, len);
 641 }
 642
 643 void DSOUND_MixCancelAt(IDirectSoundBufferImpl *dsb, DWORD buf_writepos)
 644 {
 645 #if 0
 646         DWORD   i, size, flen, len, npos, nlen;
 647         INT     iAdvance = dsb->pwfx->nBlockAlign;
 648         INT     oAdvance = dsb->device->pwfx->nBlockAlign;
 649         /* determine amount of premixed data to cancel */
 650         DWORD buf_done =
 651                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 652                 dsb->buf_mixpos - buf_writepos;
 653 #endif
 654
 655         WARN("(%p, %ld), buf_mixpos=%ld\n", dsb, buf_writepos, dsb->buf_mixpos);
 656         /* since this is not implemented yet, just cancel *ALL* prebuffering for now
 657          * (which is faster anyway when there's only a single secondary buffer) */
 658         dsb->device->need_remix = TRUE;
 659 }
 660
 661 void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
 662 {
 663         TRACE("(%p)\n",dsb);
 664         EnterCriticalSection(&dsb->lock);
 665         if (dsb->state == STATE_PLAYING)
 666                 dsb->device->need_remix = TRUE;
 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, writepos, writepos);
 675         /* determine how much already-mixed data exists */
 676         DWORD buf_done =
 677                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 678                 dsb->buf_mixpos - buf_writepos;
 679         DWORD primary_done =
 680                 ((dsb->primary_mixpos < writepos) ? dsb->device->buflen : 0) +
 681                 dsb->primary_mixpos - writepos;
 682         DWORD adv_done =
 683                 ((dsb->device->mixpos < writepos) ? dsb->device->buflen : 0) +
 684                 dsb->device->mixpos - writepos;
 685         DWORD played =
 686                 ((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
 687                 buf_writepos - dsb->playpos;
 688         DWORD buf_left = dsb->buflen - buf_writepos;
 689         int still_behind;
 690
 691         TRACE("(%p,%ld,%ld,%ld)\n",dsb,playpos,writepos,mixlen);
 692         TRACE("buf_writepos=%ld, primary_writepos=%ld\n", buf_writepos, writepos);
 693         TRACE("buf_done=%ld, primary_done=%ld\n", buf_done, primary_done);
 694         TRACE("buf_mixpos=%ld, primary_mixpos=%ld, mixlen=%ld\n", dsb->buf_mixpos, dsb->primary_mixpos,
 695               mixlen);
 696         TRACE("looping=%ld, startpos=%ld, leadin=%ld\n", dsb->playflags, dsb->startpos, dsb->leadin);
 697
 698         /* check for notification positions */
 699         if (dsb->dsbd.dwFlags & DSBCAPS_CTRLPOSITIONNOTIFY &&
 700             dsb->state != STATE_STARTING) {
 701                 DSOUND_CheckEvent(dsb, played);
 702         }
 703
 704         /* save write position for non-GETCURRENTPOSITION2... */
 705         dsb->playpos = buf_writepos;
 706
 707         /* check whether CalcPlayPosition detected a mixing underrun */
 708         if ((buf_done == 0) && (dsb->primary_mixpos != writepos)) {
 709                 /* it did, but did we have more to play? */
 710                 if ((dsb->playflags & DSBPLAY_LOOPING) ||
 711                     (dsb->buf_mixpos < dsb->buflen)) {
 712                         /* yes, have to recover */
 713                         ERR("underrun on sound buffer %p\n", dsb);
 714                         TRACE("recovering from underrun: primary_mixpos=%ld\n", writepos);
 715                 }
 716                 dsb->primary_mixpos = writepos;
 717                 primary_done = 0;
 718         }
 719         /* determine how far ahead we should mix */
 720         if (((dsb->playflags & DSBPLAY_LOOPING) ||
 721              (dsb->leadin && (dsb->probably_valid_to != 0))) &&
 722             !(dsb->dsbd.dwFlags & DSBCAPS_STATIC)) {
 723                 /* if this is a streaming buffer, it typically means that
 724                  * we should defer mixing past probably_valid_to as long
 725                  * as we can, to avoid unnecessary remixing */
 726                 /* the heavy-looking calculations shouldn't be that bad,
 727                  * as any game isn't likely to be have more than 1 or 2
 728                  * streaming buffers in use at any time anyway... */
 729                 DWORD probably_valid_left =
 730                         (dsb->probably_valid_to == (DWORD)-1) ? dsb->buflen :
 731                         ((dsb->probably_valid_to < buf_writepos) ? dsb->buflen : 0) +
 732                         dsb->probably_valid_to - buf_writepos;
 733                 /* check for leadin condition */
 734                 if ((probably_valid_left == 0) &&
 735                     (dsb->probably_valid_to == dsb->startpos) &&
 736                     dsb->leadin)
 737                         probably_valid_left = dsb->buflen;
 738                 TRACE("streaming buffer probably_valid_to=%ld, probably_valid_left=%ld\n",
 739                       dsb->probably_valid_to, probably_valid_left);
 740                 /* check whether the app's time is already up */
 741                 if (probably_valid_left < dsb->writelead) {
 742                         WARN("probably_valid_to now within writelead, possible streaming underrun\n");
 743                         /* once we pass the point of no return,
 744                          * no reason to hold back anymore */
 745                         dsb->probably_valid_to = (DWORD)-1;
 746                         /* we just have to go ahead and mix what we have,
 747                          * there's no telling what the app is thinking anyway */
 748                 } else {
 749                         /* adjust for our frequency and our sample size */
 750                         probably_valid_left = MulDiv(probably_valid_left,
 751                                                      1 << DSOUND_FREQSHIFT,
 752                                                      dsb->pwfx->nBlockAlign * dsb->freqAdjust) *
 753                                               dsb->device->pwfx->nBlockAlign;
 754                         /* check whether to clip mix_len */
 755                         if (probably_valid_left < mixlen) {
 756                                 TRACE("clipping to probably_valid_left=%ld\n", probably_valid_left);
 757                                 mixlen = probably_valid_left;
 758                         }
 759                 }
 760         }
 761         /* cut mixlen with what's already been mixed */
 762         if (mixlen < primary_done) {
 763                 /* huh? and still CalcPlayPosition didn't
 764                  * detect an underrun? */
 765                 FIXME("problem with underrun detection (mixlen=%ld < primary_done=%ld)\n", mixlen, primary_done);
 766                 return 0;
 767         }
 768         len = mixlen - primary_done;
 769         TRACE("remaining mixlen=%ld\n", len);
 770
 771         if (len < dsb->device->fraglen) {
 772                 /* smaller than a fragment, wait until it gets larger
 773                  * before we take the mixing overhead */
 774                 TRACE("mixlen not worth it, deferring mixing\n");
 775                 still_behind = 1;
 776                 goto post_mix;
 777         }
 778
 779         /* ok, we know how much to mix, let's go */
 780         still_behind = (adv_done > primary_done);
 781         while (len) {
 782                 slen = dsb->device->buflen - dsb->primary_mixpos;
 783                 if (slen > len) slen = len;
 784                 slen = DSOUND_MixInBuffer(dsb, dsb->primary_mixpos, slen);
 785
 786                 if ((dsb->primary_mixpos < dsb->device->mixpos) &&
 787                     (dsb->primary_mixpos + slen >= dsb->device->mixpos))
 788                         still_behind = FALSE;
 789
 790                 dsb->primary_mixpos += slen; len -= slen;
 791                 dsb->primary_mixpos %= dsb->device->buflen;
 792
 793                 if ((dsb->state == STATE_STOPPED) || !slen) break;
 794         }
 795         TRACE("new primary_mixpos=%ld, primary_advbase=%ld\n", dsb->primary_mixpos, dsb->device->mixpos);
 796         TRACE("mixed data len=%ld, still_behind=%d\n", mixlen-len, still_behind);
 797
 798 post_mix:
 799         /* check if buffer should be considered complete */
 800         if (buf_left < dsb->writelead &&
 801             !(dsb->playflags & DSBPLAY_LOOPING)) {
 802                 dsb->state = STATE_STOPPED;
 803                 dsb->playpos = 0;
 804                 dsb->last_playpos = 0;
 805                 dsb->buf_mixpos = 0;
 806                 dsb->leadin = FALSE;
 807                 dsb->need_remix = 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->device->mixpos) ?
 816                 dsb->device->buflen : 0) + dsb->primary_mixpos -
 817                 dsb->device->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(DirectSoundDevice *device, 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 < device->nrofbuffers; i++) {
 833                 dsb = device->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(DirectSoundDevice *device, DWORD writepos)
 866 {
 867         INT                     i;
 868         IDirectSoundBufferImpl  *dsb;
 869         int nfiller;
 870
 871         TRACE("(%p,%ld)\n", device, writepos);
 872
 873         /* the sound of silence */
 874         nfiller = device->pwfx->wBitsPerSample == 8 ? 128 : 0;
 875
 876         /* reset all buffer mix positions */
 877         for (i = 0; i < device->nrofbuffers; i++) {
 878                 dsb = device->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 (device->mixpos < writepos) {
 899                 FillMemory(device->buffer + writepos, device->buflen - writepos, nfiller);
 900                 FillMemory(device->buffer, device->mixpos, nfiller);
 901         } else {
 902                 FillMemory(device->buffer + writepos, device->mixpos - writepos, nfiller);
 903         }
 904
 905         /* reset primary mix position */
 906         device->mixpos = writepos;
 907 }
 908
 909 static void DSOUND_CheckReset(DirectSoundDevice *device, DWORD writepos)
 910 {
 911         TRACE("(%p,%ld)\n",device,writepos);
 912         if (device->need_remix) {
 913                 DSOUND_MixReset(device, writepos);
 914                 device->need_remix = FALSE;
 915                 /* maximize Half-Life performance */
 916                 device->prebuf = ds_snd_queue_min;
 917                 device->precount = 0;
 918         } else {
 919                 device->precount++;
 920                 if (device->precount >= 4) {
 921                         if (device->prebuf < ds_snd_queue_max)
 922                                 device->prebuf++;
 923                         device->precount = 0;
 924                 }
 925         }
 926         TRACE("premix adjust: %d\n", device->prebuf);
 927 }
 928
 929 void DSOUND_WaveQueue(DirectSoundDevice *device, DWORD mixq)
 930 {
 931         TRACE("(%p,%ld)\n", device, mixq);
 932         if (mixq + device->pwqueue > ds_hel_queue) mixq = ds_hel_queue - device->pwqueue;
 933         TRACE("queueing %ld buffers, starting at %d\n", mixq, device->pwwrite);
 934         for (; mixq; mixq--) {
 935                 waveOutWrite(device->hwo, device->pwave[device->pwwrite], sizeof(WAVEHDR));
 936                 device->pwwrite++;
 937                 if (device->pwwrite >= DS_HEL_FRAGS) device->pwwrite = 0;
 938                 device->pwqueue++;
 939         }
 940 }
 941
 942 /* #define SYNC_CALLBACK */
 943
 944 void DSOUND_PerformMix(DirectSoundDevice *device)
 945 {
 946         int nfiller;
 947         BOOL forced;
 948         HRESULT hres;
 949
 950         TRACE("(%p)\n", device);
 951
 952         /* the sound of silence */
 953         nfiller = device->pwfx->wBitsPerSample == 8 ? 128 : 0;
 954
 955         /* whether the primary is forced to play even without secondary buffers */
 956         forced = ((device->state == STATE_PLAYING) || (device->state == STATE_STARTING));
 957
 958         if (device->priolevel != DSSCL_WRITEPRIMARY) {
 959                 BOOL paused = ((device->state == STATE_STOPPED) || (device->state == STATE_STARTING));
 960                 /* FIXME: document variables */
 961                 DWORD playpos, writepos, inq, maxq, frag;
 962                 if (device->hwbuf) {
 963                         hres = IDsDriverBuffer_GetPosition(device->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 += device->writelead;
 973                                 writepos %= device->buflen;
 974                         } else writepos = playpos;
 975                 } else {
 976                         playpos = device->pwplay * device->fraglen;
 977                         writepos = playpos;
 978                         if (!paused) {
 979                                 writepos += ds_hel_margin * device->fraglen;
 980                                 writepos %= device->buflen;
 981                         }
 982                 }
 983                 TRACE("primary playpos=%ld, writepos=%ld, clrpos=%ld, mixpos=%ld, buflen=%ld\n",
 984                       playpos,writepos,device->playpos,device->mixpos,device->buflen);
 985                 assert(device->playpos < device->buflen);
 986                 /* wipe out just-played sound data */
 987                 if (playpos < device->playpos) {
 988                         FillMemory(device->buffer + device->playpos, device->buflen - device->playpos, nfiller);
 989                         FillMemory(device->buffer, playpos, nfiller);
 990                 } else {
 991                         FillMemory(device->buffer + device->playpos, playpos - device->playpos, nfiller);
 992                 }
 993                 device->playpos = playpos;
 994
 995                 EnterCriticalSection(&(device->mixlock));
 996
 997                 /* reset mixing if necessary */
 998                 DSOUND_CheckReset(device, writepos);
 999
1000                 /* check how much prebuffering is left */
1001                 inq = device->mixpos;
1002                 if (inq < writepos)
1003                         inq += device->buflen;
1004                 inq -= writepos;
1005
1006                 /* find the maximum we can prebuffer */
1007                 if (!paused) {
1008                         maxq = playpos;
1009                         if (maxq < writepos)
1010                                 maxq += device->buflen;
1011                         maxq -= writepos;
1012                 } else maxq = device->buflen;
1013
1014                 /* clip maxq to device->prebuf */
1015                 frag = device->prebuf * device->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 (device->state == STATE_PLAYING) {
1027                                 device->state = STATE_STARTING;
1028                         }
1029                         else if (device->state == STATE_STOPPING) {
1030                                 device->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", device->state);
1035                         }
1036 #ifdef SYNC_CALLBACK
1037                         /* DSOUND_callback may need this lock */
1038                         LeaveCriticalSection(&(device->mixlock));
1039 #endif
1040                         if (DSOUND_PrimaryStop(device) != DS_OK)
1041                                 WARN("DSOUND_PrimaryStop failed\n");
1042 #ifdef SYNC_CALLBACK
1043                         EnterCriticalSection(&(device->mixlock));
1044 #endif
1045                         if (device->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(device->hwbuf, &playpos, NULL);
1049                                 if (hres) {
1050                                         LeaveCriticalSection(&(device->mixlock));
1051                                         WARN("IDsDriverBuffer_GetPosition failed\n");
1052                                         return;
1053                                 }
1054                         } else {
1055                                 playpos = device->pwplay * device->fraglen;
1056                         }
1057                         writepos = playpos;
1058                         device->playpos = playpos;
1059                         device->mixpos = writepos;
1060                         inq = 0;
1061                         maxq = device->buflen;
1062                         if (maxq > frag) maxq = frag;
1063                         FillMemory(device->buffer, device->buflen, nfiller);
1064                         paused = TRUE;
1065                 }
1066
1067                 /* do the mixing */
1068                 frag = DSOUND_MixToPrimary(device, playpos, writepos, maxq, paused);
1069                 if (forced) frag = maxq - inq;
1070                 device->mixpos += frag;
1071                 device->mixpos %= device->buflen;
1072
1073                 if (frag) {
1074                         /* buffers have been filled, restart playback */
1075                         if (device->state == STATE_STARTING) {
1076                                 device->state = STATE_PLAYING;
1077                         }
1078                         else if (device->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                                 device->state = STATE_STOPPING;
1082                         }
1083                         LeaveCriticalSection(&(device->mixlock));
1084                         if (paused) {
1085                                 if (DSOUND_PrimaryPlay(device) != DS_OK)
1086                                         WARN("DSOUND_PrimaryPlay failed\n");
1087                                 else
1088                                         TRACE("starting playback\n");
1089                         }
1090                 }
1091                 else
1092                         LeaveCriticalSection(&(device->mixlock));
1093         } else {
1094                 /* in the DSSCL_WRITEPRIMARY mode, the app is totally in charge... */
1095                 if (device->state == STATE_STARTING) {
1096                         if (DSOUND_PrimaryPlay(device) != DS_OK)
1097                                 WARN("DSOUND_PrimaryPlay failed\n");
1098                         else
1099                                 device->state = STATE_PLAYING;
1100                 }
1101                 else if (device->state == STATE_STOPPING) {
1102                         if (DSOUND_PrimaryStop(device) != DS_OK)
1103                                 WARN("DSOUND_PrimaryStop failed\n");
1104                         else
1105                                 device->state = STATE_STOPPED;
1106                 }
1107         }
1108 }
1109
1110 void CALLBACK DSOUND_timer(UINT timerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1111 {
1112         DirectSoundDevice * device = (DirectSoundDevice*)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[device->drvdesc.dnDevNode] != device) {
1119                 ERR("dsound died without killing us?\n");
1120                 timeKillEvent(timerID);
1121                 timeEndPeriod(DS_TIME_RES);
1122                 return;
1123         }
1124
1125         RtlAcquireResourceShared(&(device->buffer_list_lock), TRUE);
1126
1127         if (device->ref)
1128                 DSOUND_PerformMix(device);
1129
1130         RtlReleaseResource(&(device->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         DirectSoundDevice * device = (DirectSoundDevice*)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 (device->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(&(device->mixlock));
1153 #endif
1154                 /* retrieve current values */
1155                 fraglen = device->fraglen;
1156                 buflen = device->buflen;
1157                 pwplay = device->pwplay;
1158                 playpos = pwplay * fraglen;
1159                 mixpos = device->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                 device->pwplay = pwplay;
1170                 device->pwqueue--;
1171                 /* queue new buffer if we have data for it */
1172                 if (inq>1) DSOUND_WaveQueue(device, inq-1);
1173 #ifdef SYNC_CALLBACK
1174                 LeaveCriticalSection(&(device->mixlock));
1175 #endif
1176         }
1177         TRACE("completed\n");
1178 }