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   1 /*                      DirectSound
   2  *
   3  * Copyright 1998 Marcus Meissner
   4  * Copyright 1998 Rob Riggs
   5  * Copyright 2000-2002 TransGaming Technologies, Inc.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <assert.h>
  23 #include <stdarg.h>
  24 #include <math.h>       /* Insomnia - pow() function */
  25
  26 #define NONAMELESSSTRUCT
  27 #define NONAMELESSUNION
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "mmsystem.h"
  31 #include "winreg.h"
  32 #include "winternl.h"
  33 #include "wine/debug.h"
  34 #include "dsound.h"
  35 #include "dsdriver.h"
  36 #include "dsound_private.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(dsound);
  39
  40 void DSOUND_RecalcVolPan(PDSVOLUMEPAN volpan)
  41 {
  42         double temp;
  43         TRACE("(%p)\n",volpan);
  44
  45         TRACE("Vol=%ld Pan=%ld\n", volpan->lVolume, volpan->lPan);
  46         /* the AmpFactors are expressed in 16.16 fixed point */
  47         volpan->dwVolAmpFactor = (ULONG) (pow(2.0, volpan->lVolume / 600.0) * 0xffff);
  48         /* FIXME: dwPan{Left|Right}AmpFactor */
  49
  50         /* FIXME: use calculated vol and pan ampfactors */
  51         temp = (double) (volpan->lVolume - (volpan->lPan > 0 ? volpan->lPan : 0));
  52         volpan->dwTotalLeftAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 0xffff);
  53         temp = (double) (volpan->lVolume + (volpan->lPan < 0 ? volpan->lPan : 0));
  54         volpan->dwTotalRightAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 0xffff);
  55
  56         TRACE("left = %lx, right = %lx\n", volpan->dwTotalLeftAmpFactor, volpan->dwTotalRightAmpFactor);
  57 }
  58
  59 void DSOUND_AmpFactorToVolPan(PDSVOLUMEPAN volpan)
  60 {
  61     double left,right;
  62     TRACE("(%p)\n",volpan);
  63
  64     TRACE("left=%lx, right=%lx\n",volpan->dwTotalLeftAmpFactor,volpan->dwTotalRightAmpFactor);
  65     if (volpan->dwTotalLeftAmpFactor==0)
  66         left=-10000;
  67     else
  68         left=600 * log(((double)volpan->dwTotalLeftAmpFactor) / 0xffff) / log(2);
  69     if (volpan->dwTotalRightAmpFactor==0)
  70         right=-10000;
  71     else
  72         right=600 * log(((double)volpan->dwTotalRightAmpFactor) / 0xffff) / log(2);
  73     if (left<right)
  74     {
  75         volpan->lVolume=right;
  76         volpan->dwVolAmpFactor=volpan->dwTotalRightAmpFactor;
  77     }
  78     else
  79     {
  80         volpan->lVolume=left;
  81         volpan->dwVolAmpFactor=volpan->dwTotalLeftAmpFactor;
  82     }
  83     if (volpan->lVolume < -10000)
  84         volpan->lVolume=-10000;
  85     volpan->lPan=right-left;
  86     if (volpan->lPan < -10000)
  87         volpan->lPan=-10000;
  88
  89     TRACE("Vol=%ld Pan=%ld\n", volpan->lVolume, volpan->lPan);
  90 }
  91
  92 void DSOUND_RecalcFormat(IDirectSoundBufferImpl *dsb)
  93 {
  94         TRACE("(%p)\n",dsb);
  95
  96         /* calculate the 10ms write lead */
  97         dsb->writelead = (dsb->freq / 100) * dsb->pwfx->nBlockAlign;
  98 }
  99
 100 void DSOUND_CheckEvent(IDirectSoundBufferImpl *dsb, int len)
 101 {
 102         int                     i;
 103         DWORD                   offset;
 104         LPDSBPOSITIONNOTIFY     event;
 105         TRACE("(%p,%d)\n",dsb,len);
 106
 107         if (dsb->nrofnotifies == 0)
 108                 return;
 109
 110         TRACE("(%p) buflen = %ld, playpos = %ld, len = %d\n",
 111                 dsb, dsb->buflen, dsb->playpos, len);
 112         for (i = 0; i < dsb->nrofnotifies ; i++) {
 113                 event = dsb->notifies + i;
 114                 offset = event->dwOffset;
 115                 TRACE("checking %d, position %ld, event = %p\n",
 116                         i, offset, event->hEventNotify);
 117                 /* DSBPN_OFFSETSTOP has to be the last element. So this is */
 118                 /* OK. [Inside DirectX, p274] */
 119                 /*  */
 120                 /* This also means we can't sort the entries by offset, */
 121                 /* because DSBPN_OFFSETSTOP == -1 */
 122                 if (offset == DSBPN_OFFSETSTOP) {
 123                         if (dsb->state == STATE_STOPPED) {
 124                                 SetEvent(event->hEventNotify);
 125                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 126                                 return;
 127                         } else
 128                                 return;
 129                 }
 130                 if ((dsb->playpos + len) >= dsb->buflen) {
 131                         if ((offset < ((dsb->playpos + len) % dsb->buflen)) ||
 132                             (offset >= dsb->playpos)) {
 133                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 134                                 SetEvent(event->hEventNotify);
 135                         }
 136                 } else {
 137                         if ((offset >= dsb->playpos) && (offset < (dsb->playpos + len))) {
 138                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 139                                 SetEvent(event->hEventNotify);
 140                         }
 141                 }
 142         }
 143 }
 144
 145 /* WAV format info can be found at:
 146  *
 147  *    http://www.cwi.nl/ftp/audio/AudioFormats.part2
 148  *    ftp://ftp.cwi.nl/pub/audio/RIFF-format
 149  *
 150  * Import points to remember:
 151  *    8-bit WAV is unsigned
 152  *    16-bit WAV is signed
 153  */
 154  /* Use the same formulas as pcmconverter.c */
 155 static inline INT16 cvtU8toS16(BYTE b)
 156 {
 157     return (short)((b+(b << 8))-32768);
 158 }
 159
 160 static inline BYTE cvtS16toU8(INT16 s)
 161 {
 162     return (s >> 8) ^ (unsigned char)0x80;
 163 }
 164
 165 static inline void cp_fields(const IDirectSoundBufferImpl *dsb, BYTE *ibuf, BYTE *obuf )
 166 {
 167         DirectSoundDevice * device = dsb->dsound->device;
 168         INT fl,fr;
 169
 170         if (dsb->pwfx->wBitsPerSample == 8)  {
 171                 if (device->pwfx->wBitsPerSample == 8 &&
 172                     device->pwfx->nChannels == dsb->pwfx->nChannels) {
 173                         /* avoid needless 8->16->8 conversion */
 174                         *obuf=*ibuf;
 175                         if (dsb->pwfx->nChannels==2)
 176                                 *(obuf+1)=*(ibuf+1);
 177                         return;
 178                 }
 179                 fl = cvtU8toS16(*ibuf);
 180                 fr = (dsb->pwfx->nChannels==2 ? cvtU8toS16(*(ibuf + 1)) : fl);
 181         } else {
 182                 fl = *((INT16 *)ibuf);
 183                 fr = (dsb->pwfx->nChannels==2 ? *(((INT16 *)ibuf) + 1)  : fl);
 184         }
 185
 186         if (device->pwfx->nChannels == 2) {
 187                 if (device->pwfx->wBitsPerSample == 8) {
 188                         *obuf = cvtS16toU8(fl);
 189                         *(obuf + 1) = cvtS16toU8(fr);
 190                         return;
 191                 }
 192                 if (device->pwfx->wBitsPerSample == 16) {
 193                         *((INT16 *)obuf) = fl;
 194                         *(((INT16 *)obuf) + 1) = fr;
 195                         return;
 196                 }
 197         }
 198         if (device->pwfx->nChannels == 1) {
 199                 fl = (fl + fr) >> 1;
 200                 if (device->pwfx->wBitsPerSample == 8) {
 201                         *obuf = cvtS16toU8(fl);
 202                         return;
 203                 }
 204                 if (device->pwfx->wBitsPerSample == 16) {
 205                         *((INT16 *)obuf) = fl;
 206                         return;
 207                 }
 208         }
 209 }
 210
 211 /* Now with PerfectPitch (tm) technology */
 212 static INT DSOUND_MixerNorm(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
 213 {
 214         INT     i, size, ipos, ilen;
 215         BYTE    *ibp, *obp;
 216         INT     iAdvance = dsb->pwfx->nBlockAlign;
 217         INT     oAdvance = dsb->dsound->device->pwfx->nBlockAlign;
 218
 219         ibp = dsb->buffer->memory + dsb->buf_mixpos;
 220         obp = buf;
 221
 222         TRACE("(%p, %p, %p), buf_mixpos=%ld\n", dsb, ibp, obp, dsb->buf_mixpos);
 223         /* Check for the best case */
 224         if ((dsb->freq == dsb->dsound->device->pwfx->nSamplesPerSec) &&
 225             (dsb->pwfx->wBitsPerSample == dsb->dsound->device->pwfx->wBitsPerSample) &&
 226             (dsb->pwfx->nChannels == dsb->dsound->device->pwfx->nChannels)) {
 227                 INT bytesleft = dsb->buflen - dsb->buf_mixpos;
 228                 TRACE("(%p) Best case\n", dsb);
 229                 if (len <= bytesleft )
 230                         CopyMemory(obp, ibp, len);
 231                 else { /* wrap */
 232                         CopyMemory(obp, ibp, bytesleft);
 233                         CopyMemory(obp + bytesleft, dsb->buffer->memory, len - bytesleft);
 234                 }
 235                 return len;
 236         }
 237
 238         /* Check for same sample rate */
 239         if (dsb->freq == dsb->dsound->device->pwfx->nSamplesPerSec) {
 240                 TRACE("(%p) Same sample rate %ld = primary %ld\n", dsb,
 241                         dsb->freq, dsb->dsound->device->pwfx->nSamplesPerSec);
 242                 ilen = 0;
 243                 for (i = 0; i < len; i += oAdvance) {
 244                         cp_fields(dsb, ibp, obp );
 245                         ibp += iAdvance;
 246                         ilen += iAdvance;
 247                         obp += oAdvance;
 248                         if (ibp >= (BYTE *)(dsb->buffer->memory + dsb->buflen))
 249                                 ibp = dsb->buffer->memory;      /* wrap */
 250                 }
 251                 return (ilen);
 252         }
 253
 254         /* Mix in different sample rates */
 255         /* */
 256         /* New PerfectPitch(tm) Technology (c) 1998 Rob Riggs */
 257         /* Patent Pending :-] */
 258
 259         /* Patent enhancements (c) 2000 Ove Kåven,
 260          * TransGaming Technologies Inc. */
 261
 262         /* FIXME("(%p) Adjusting frequency: %ld -> %ld (need optimization)\n",
 263            dsb, dsb->freq, dsb->dsound->device->pwfx->nSamplesPerSec); */
 264
 265         size = len / oAdvance;
 266         ilen = 0;
 267         ipos = dsb->buf_mixpos;
 268         for (i = 0; i < size; i++) {
 269                 cp_fields(dsb, (dsb->buffer->memory + ipos), obp);
 270                 obp += oAdvance;
 271                 dsb->freqAcc += dsb->freqAdjust;
 272                 if (dsb->freqAcc >= (1<<DSOUND_FREQSHIFT)) {
 273                         ULONG adv = (dsb->freqAcc>>DSOUND_FREQSHIFT) * iAdvance;
 274                         dsb->freqAcc &= (1<<DSOUND_FREQSHIFT)-1;
 275                         ipos += adv; ilen += adv;
 276                         ipos %= dsb->buflen;
 277                 }
 278         }
 279         return ilen;
 280 }
 281
 282 static void DSOUND_MixerVol(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
 283 {
 284         INT     i;
 285         BYTE    *bpc = buf;
 286         INT16   *bps = (INT16 *) buf;
 287
 288         TRACE("(%p,%p,%d)\n",dsb,buf,len);
 289         TRACE("left = %lx, right = %lx\n", dsb->cvolpan.dwTotalLeftAmpFactor,
 290                 dsb->cvolpan.dwTotalRightAmpFactor);
 291
 292         if ((!(dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) || (dsb->cvolpan.lPan == 0)) &&
 293             (!(dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) || (dsb->cvolpan.lVolume == 0)) &&
 294             !(dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 295                 return;         /* Nothing to do */
 296
 297         /* If we end up with some bozo coder using panning or 3D sound */
 298         /* with a mono primary buffer, it could sound very weird using */
 299         /* this method. Oh well, tough patooties. */
 300
 301         switch (dsb->dsound->device->pwfx->wBitsPerSample) {
 302         case 8:
 303                 /* 8-bit WAV is unsigned, but we need to operate */
 304                 /* on signed data for this to work properly */
 305                 switch (dsb->dsound->device->pwfx->nChannels) {
 306                 case 1:
 307                         for (i = 0; i < len; i++) {
 308                                 INT val = *bpc - 128;
 309                                 val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 310                                 *bpc = val + 128;
 311                                 bpc++;
 312                         }
 313                         break;
 314                 case 2:
 315                         for (i = 0; i < len; i+=2) {
 316                                 INT val = *bpc - 128;
 317                                 val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 318                                 *bpc++ = val + 128;
 319                                 val = *bpc - 128;
 320                                 val = (val * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
 321                                 *bpc = val + 128;
 322                                 bpc++;
 323                         }
 324                         break;
 325                 default:
 326                         FIXME("doesn't support %d channels\n", dsb->dsound->device->pwfx->nChannels);
 327                         break;
 328                 }
 329                 break;
 330         case 16:
 331                 /* 16-bit WAV is signed -- much better */
 332                 switch (dsb->dsound->device->pwfx->nChannels) {
 333                 case 1:
 334                         for (i = 0; i < len; i += 2) {
 335                                 *bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 336                                 bps++;
 337                         }
 338                         break;
 339                 case 2:
 340                         for (i = 0; i < len; i += 4) {
 341                                 *bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
 342                                 bps++;
 343                                 *bps = (*bps * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
 344                                 bps++;
 345                         }
 346                         break;
 347                 default:
 348                         FIXME("doesn't support %d channels\n", dsb->dsound->device->pwfx->nChannels);
 349                         break;
 350                 }
 351                 break;
 352         default:
 353                 FIXME("doesn't support %d bit samples\n", dsb->dsound->device->pwfx->wBitsPerSample);
 354                 break;
 355         }
 356 }
 357
 358 static LPBYTE DSOUND_tmpbuffer(DirectSoundDevice *device, DWORD len)
 359 {
 360     TRACE("(%p,%ld)\n", device, len);
 361
 362     if (len > device->tmp_buffer_len) {
 363         if (device->tmp_buffer)
 364             device->tmp_buffer = HeapReAlloc(GetProcessHeap(), 0, device->tmp_buffer, len);
 365         else
 366             device->tmp_buffer = HeapAlloc(GetProcessHeap(), 0, len);
 367
 368         device->tmp_buffer_len = len;
 369     }
 370
 371     return device->tmp_buffer;
 372 }
 373
 374 static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD fraglen)
 375 {
 376         INT     i, len, ilen, field, todo;
 377         BYTE    *buf, *ibuf;
 378
 379         TRACE("(%p,%ld,%ld)\n",dsb,writepos,fraglen);
 380
 381         len = fraglen;
 382         if (!(dsb->playflags & DSBPLAY_LOOPING)) {
 383                 int secondary_remainder = dsb->buflen - dsb->buf_mixpos;
 384                 int adjusted_remainder = MulDiv(dsb->dsound->device->pwfx->nAvgBytesPerSec, secondary_remainder, dsb->nAvgBytesPerSec);
 385                 assert(adjusted_remainder >= 0);
 386                 TRACE("secondary_remainder = %d, adjusted_remainder = %d, len = %d\n", secondary_remainder, adjusted_remainder, len);
 387                 if (adjusted_remainder < len) {
 388                         TRACE("clipping len to remainder of secondary buffer\n");
 389                         len = adjusted_remainder;
 390                 }
 391                 if (len == 0)
 392                         return 0;
 393         }
 394
 395         if (len % dsb->dsound->device->pwfx->nBlockAlign) {
 396                 INT nBlockAlign = dsb->dsound->device->pwfx->nBlockAlign;
 397                 ERR("length not a multiple of block size, len = %d, block size = %d\n", len, nBlockAlign);
 398                 len = (len / nBlockAlign) * nBlockAlign;        /* data alignment */
 399         }
 400
 401         if ((buf = ibuf = DSOUND_tmpbuffer(dsb->dsound->device, len)) == NULL)
 402                 return 0;
 403
 404         TRACE("MixInBuffer (%p) len = %d, dest = %ld\n", dsb, len, writepos);
 405
 406         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 407         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 408             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 409             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 410                 DSOUND_MixerVol(dsb, ibuf, len);
 411
 412         if (dsb->dsound->device->pwfx->wBitsPerSample == 8) {
 413                 BYTE    *obuf = dsb->dsound->device->buffer + writepos;
 414
 415                 if ((writepos + len) <= dsb->dsound->device->buflen)
 416                         todo = len;
 417                 else
 418                         todo = dsb->dsound->device->buflen - writepos;
 419
 420                 for (i = 0; i < todo; i++) {
 421                         /* 8-bit WAV is unsigned */
 422                         field = (*ibuf++ - 128);
 423                         field += (*obuf - 128);
 424                         if (field > 127) field = 127;
 425                         else if (field < -128) field = -128;
 426                         *obuf++ = field + 128;
 427                 }
 428
 429                 if (todo < len) {
 430                         todo = len - todo;
 431                         obuf = dsb->dsound->device->buffer;
 432
 433                         for (i = 0; i < todo; i++) {
 434                                 /* 8-bit WAV is unsigned */
 435                                 field = (*ibuf++ - 128);
 436                                 field += (*obuf - 128);
 437                                 if (field > 127) field = 127;
 438                                 else if (field < -128) field = -128;
 439                                 *obuf++ = field + 128;
 440                         }
 441                 }
 442         } else {
 443                 INT16   *ibufs, *obufs;
 444
 445                 ibufs = (INT16 *) ibuf;
 446                 obufs = (INT16 *)(dsb->dsound->device->buffer + writepos);
 447
 448                 if ((writepos + len) <= dsb->dsound->device->buflen)
 449                         todo = len / 2;
 450                 else
 451                         todo = (dsb->dsound->device->buflen - writepos) / 2;
 452
 453                 for (i = 0; i < todo; i++) {
 454                         /* 16-bit WAV is signed */
 455                         field = *ibufs++;
 456                         field += *obufs;
 457                         if (field > 32767) field = 32767;
 458                         else if (field < -32768) field = -32768;
 459                         *obufs++ = field;
 460                 }
 461
 462                 if (todo < (len / 2)) {
 463                         todo = (len / 2) - todo;
 464                         obufs = (INT16 *)dsb->dsound->device->buffer;
 465
 466                         for (i = 0; i < todo; i++) {
 467                                 /* 16-bit WAV is signed */
 468                                 field = *ibufs++;
 469                                 field += *obufs;
 470                                 if (field > 32767) field = 32767;
 471                                 else if (field < -32768) field = -32768;
 472                                 *obufs++ = field;
 473                         }
 474                 }
 475         }
 476
 477         if (dsb->leadin && (dsb->startpos > dsb->buf_mixpos) && (dsb->startpos <= dsb->buf_mixpos + ilen)) {
 478                 /* HACK... leadin should be reset when the PLAY position reaches the startpos,
 479                  * not the MIX position... but if the sound buffer is bigger than our prebuffering
 480                  * (which must be the case for the streaming buffers that need this hack anyway)
 481                  * plus DS_HEL_MARGIN or equivalent, then this ought to work anyway. */
 482                 dsb->leadin = FALSE;
 483         }
 484
 485         dsb->buf_mixpos += ilen;
 486
 487         if (dsb->buf_mixpos >= dsb->buflen) {
 488                 if (dsb->playflags & DSBPLAY_LOOPING) {
 489                         /* wrap */
 490                         dsb->buf_mixpos %= dsb->buflen;
 491                         if (dsb->leadin && (dsb->startpos <= dsb->buf_mixpos))
 492                                 dsb->leadin = FALSE; /* HACK: see above */
 493                 } else if (dsb->buf_mixpos > dsb->buflen) {
 494                         ERR("Mixpos (%lu) past buflen (%lu), capping...\n", dsb->buf_mixpos, dsb->buflen);
 495                         dsb->buf_mixpos = dsb->buflen;
 496                 }
 497         }
 498
 499         return len;
 500 }
 501
 502 static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD len)
 503 {
 504         INT     ilen, field;
 505         UINT    i, todo;
 506         BYTE    *buf, *ibuf;
 507
 508         TRACE("(%p,%ld,%ld)\n",dsb,writepos,len);
 509
 510         if (len % dsb->dsound->device->pwfx->nBlockAlign) {
 511                 INT nBlockAlign = dsb->dsound->device->pwfx->nBlockAlign;
 512                 ERR("length not a multiple of block size, len = %ld, block size = %d\n", len, nBlockAlign);
 513                 len = (len / nBlockAlign) * nBlockAlign;        /* data alignment */
 514         }
 515
 516         if ((buf = ibuf = DSOUND_tmpbuffer(dsb->dsound->device, len)) == NULL)
 517                 return;
 518
 519         TRACE("PhaseCancel (%p) len = %ld, dest = %ld\n", dsb, len, writepos);
 520
 521         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 522         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 523             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) ||
 524             (dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 525                 DSOUND_MixerVol(dsb, ibuf, len);
 526
 527         /* subtract instead of add, to phase out premixed data */
 528         if (dsb->dsound->device->pwfx->wBitsPerSample == 8) {
 529                 BYTE    *obuf = dsb->dsound->device->buffer + writepos;
 530
 531                 if ((writepos + len) <= dsb->dsound->device->buflen)
 532                         todo = len;
 533                 else
 534                         todo = dsb->dsound->device->buflen - writepos;
 535
 536                 for (i = 0; i < todo; i++) {
 537                         /* 8-bit WAV is unsigned */
 538                         field = (*ibuf++ - 128);
 539                         field -= (*obuf - 128);
 540                         if (field > 127) field = 127;
 541                         else if (field < -128) field = -128;
 542                         *obuf++ = field + 128;
 543                 }
 544
 545                 if (todo < len) {
 546                         todo = len - todo;
 547                         obuf = dsb->dsound->device->buffer;
 548
 549                         for (i = 0; i < todo; i++) {
 550                                 /* 8-bit WAV is unsigned */
 551                                 field = (*ibuf++ - 128);
 552                                 field -= (*obuf - 128);
 553                                 if (field > 127) field = 127;
 554                                 else if (field < -128) field = -128;
 555                                 *obuf++ = field + 128;
 556                         }
 557                 }
 558         } else {
 559                 INT16   *ibufs, *obufs;
 560
 561                 ibufs = (INT16 *) ibuf;
 562                 obufs = (INT16 *)(dsb->dsound->device->buffer + writepos);
 563
 564                 if ((writepos + len) <= dsb->dsound->device->buflen)
 565                         todo = len / 2;
 566                 else
 567                         todo = (dsb->dsound->device->buflen - writepos) / 2;
 568
 569                 for (i = 0; i < todo; i++) {
 570                         /* 16-bit WAV is signed */
 571                         field = *ibufs++;
 572                         field -= *obufs;
 573                         if (field > 32767) field = 32767;
 574                         else if (field < -32768) field = -32768;
 575                         *obufs++ = field;
 576                 }
 577
 578                 if (todo < (len / 2)) {
 579                         todo = (len / 2) - todo;
 580                         obufs = (INT16 *)dsb->dsound->device->buffer;
 581
 582                         for (i = 0; i < todo; i++) {
 583                                 /* 16-bit WAV is signed */
 584                                 field = *ibufs++;
 585                                 field -= *obufs;
 586                                 if (field > 32767) field = 32767;
 587                                 else if (field < -32768) field = -32768;
 588                                 *obufs++ = field;
 589                         }
 590                 }
 591         }
 592 }
 593
 594 static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)
 595 {
 596         DWORD   size, flen, len, npos, nlen;
 597         INT     iAdvance = dsb->pwfx->nBlockAlign;
 598         INT     oAdvance = dsb->dsound->device->pwfx->nBlockAlign;
 599         /* determine amount of premixed data to cancel */
 600         DWORD primary_done =
 601                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->device->buflen : 0) +
 602                 dsb->primary_mixpos - writepos;
 603
 604         TRACE("(%p, %ld), buf_mixpos=%ld\n", dsb, writepos, dsb->buf_mixpos);
 605
 606         /* backtrack the mix position */
 607         size = primary_done / oAdvance;
 608         flen = size * dsb->freqAdjust;
 609         len = (flen >> DSOUND_FREQSHIFT) * iAdvance;
 610         flen &= (1<<DSOUND_FREQSHIFT)-1;
 611         while (dsb->freqAcc < flen) {
 612                 len += iAdvance;
 613                 dsb->freqAcc += 1<<DSOUND_FREQSHIFT;
 614         }
 615         len %= dsb->buflen;
 616         npos = ((dsb->buf_mixpos < len) ? dsb->buflen : 0) +
 617                 dsb->buf_mixpos - len;
 618         if (dsb->leadin && (dsb->startpos > npos) && (dsb->startpos <= npos + len)) {
 619                 /* stop backtracking at startpos */
 620                 npos = dsb->startpos;
 621                 len = ((dsb->buf_mixpos < npos) ? dsb->buflen : 0) +
 622                         dsb->buf_mixpos - npos;
 623                 flen = dsb->freqAcc;
 624                 nlen = len / dsb->pwfx->nBlockAlign;
 625                 nlen = ((nlen << DSOUND_FREQSHIFT) + flen) / dsb->freqAdjust;
 626                 nlen *= dsb->dsound->device->pwfx->nBlockAlign;
 627                 writepos =
 628                         ((dsb->primary_mixpos < nlen) ? dsb->dsound->device->buflen : 0) +
 629                         dsb->primary_mixpos - nlen;
 630         }
 631
 632         dsb->freqAcc -= flen;
 633         dsb->buf_mixpos = npos;
 634         dsb->primary_mixpos = writepos;
 635
 636         TRACE("new buf_mixpos=%ld, primary_mixpos=%ld (len=%ld)\n",
 637               dsb->buf_mixpos, dsb->primary_mixpos, len);
 638
 639         if (cancel) DSOUND_PhaseCancel(dsb, writepos, len);
 640 }
 641
 642 void DSOUND_MixCancelAt(IDirectSoundBufferImpl *dsb, DWORD buf_writepos)
 643 {
 644 #if 0
 645         DWORD   i, size, flen, len, npos, nlen;
 646         INT     iAdvance = dsb->pwfx->nBlockAlign;
 647         INT     oAdvance = dsb->dsound->device->pwfx->nBlockAlign;
 648         /* determine amount of premixed data to cancel */
 649         DWORD buf_done =
 650                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 651                 dsb->buf_mixpos - buf_writepos;
 652 #endif
 653
 654         WARN("(%p, %ld), buf_mixpos=%ld\n", dsb, buf_writepos, dsb->buf_mixpos);
 655         /* since this is not implemented yet, just cancel *ALL* prebuffering for now
 656          * (which is faster anyway when there's only a single secondary buffer) */
 657         dsb->dsound->device->need_remix = TRUE;
 658 }
 659
 660 void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
 661 {
 662         TRACE("(%p)\n",dsb);
 663         EnterCriticalSection(&dsb->lock);
 664         if (dsb->state == STATE_PLAYING)
 665                 dsb->dsound->device->need_remix = TRUE;
 666         LeaveCriticalSection(&dsb->lock);
 667 }
 668
 669 static DWORD DSOUND_MixOne(IDirectSoundBufferImpl *dsb, DWORD playpos, DWORD writepos, DWORD mixlen)
 670 {
 671         DWORD len, slen;
 672         /* determine this buffer's write position */
 673         DWORD buf_writepos = DSOUND_CalcPlayPosition(dsb, writepos, writepos);
 674         /* determine how much already-mixed data exists */
 675         DWORD buf_done =
 676                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 677                 dsb->buf_mixpos - buf_writepos;
 678         DWORD primary_done =
 679                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->device->buflen : 0) +
 680                 dsb->primary_mixpos - writepos;
 681         DWORD adv_done =
 682                 ((dsb->dsound->device->mixpos < writepos) ? dsb->dsound->device->buflen : 0) +
 683                 dsb->dsound->device->mixpos - writepos;
 684         DWORD played =
 685                 ((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
 686                 buf_writepos - dsb->playpos;
 687         DWORD buf_left = dsb->buflen - buf_writepos;
 688         int still_behind;
 689
 690         TRACE("(%p,%ld,%ld,%ld)\n",dsb,playpos,writepos,mixlen);
 691         TRACE("buf_writepos=%ld, primary_writepos=%ld\n", buf_writepos, writepos);
 692         TRACE("buf_done=%ld, primary_done=%ld\n", buf_done, primary_done);
 693         TRACE("buf_mixpos=%ld, primary_mixpos=%ld, mixlen=%ld\n", dsb->buf_mixpos, dsb->primary_mixpos,
 694               mixlen);
 695         TRACE("looping=%ld, startpos=%ld, leadin=%ld\n", dsb->playflags, dsb->startpos, dsb->leadin);
 696
 697         /* check for notification positions */
 698         if (dsb->dsbd.dwFlags & DSBCAPS_CTRLPOSITIONNOTIFY &&
 699             dsb->state != STATE_STARTING) {
 700                 DSOUND_CheckEvent(dsb, played);
 701         }
 702
 703         /* save write position for non-GETCURRENTPOSITION2... */
 704         dsb->playpos = buf_writepos;
 705
 706         /* check whether CalcPlayPosition detected a mixing underrun */
 707         if ((buf_done == 0) && (dsb->primary_mixpos != writepos)) {
 708                 /* it did, but did we have more to play? */
 709                 if ((dsb->playflags & DSBPLAY_LOOPING) ||
 710                     (dsb->buf_mixpos < dsb->buflen)) {
 711                         /* yes, have to recover */
 712                         ERR("underrun on sound buffer %p\n", dsb);
 713                         TRACE("recovering from underrun: primary_mixpos=%ld\n", writepos);
 714                 }
 715                 dsb->primary_mixpos = writepos;
 716                 primary_done = 0;
 717         }
 718         /* determine how far ahead we should mix */
 719         if (((dsb->playflags & DSBPLAY_LOOPING) ||
 720              (dsb->leadin && (dsb->probably_valid_to != 0))) &&
 721             !(dsb->dsbd.dwFlags & DSBCAPS_STATIC)) {
 722                 /* if this is a streaming buffer, it typically means that
 723                  * we should defer mixing past probably_valid_to as long
 724                  * as we can, to avoid unnecessary remixing */
 725                 /* the heavy-looking calculations shouldn't be that bad,
 726                  * as any game isn't likely to be have more than 1 or 2
 727                  * streaming buffers in use at any time anyway... */
 728                 DWORD probably_valid_left =
 729                         (dsb->probably_valid_to == (DWORD)-1) ? dsb->buflen :
 730                         ((dsb->probably_valid_to < buf_writepos) ? dsb->buflen : 0) +
 731                         dsb->probably_valid_to - buf_writepos;
 732                 /* check for leadin condition */
 733                 if ((probably_valid_left == 0) &&
 734                     (dsb->probably_valid_to == dsb->startpos) &&
 735                     dsb->leadin)
 736                         probably_valid_left = dsb->buflen;
 737                 TRACE("streaming buffer probably_valid_to=%ld, probably_valid_left=%ld\n",
 738                       dsb->probably_valid_to, probably_valid_left);
 739                 /* check whether the app's time is already up */
 740                 if (probably_valid_left < dsb->writelead) {
 741                         WARN("probably_valid_to now within writelead, possible streaming underrun\n");
 742                         /* once we pass the point of no return,
 743                          * no reason to hold back anymore */
 744                         dsb->probably_valid_to = (DWORD)-1;
 745                         /* we just have to go ahead and mix what we have,
 746                          * there's no telling what the app is thinking anyway */
 747                 } else {
 748                         /* adjust for our frequency and our sample size */
 749                         probably_valid_left = MulDiv(probably_valid_left,
 750                                                      1 << DSOUND_FREQSHIFT,
 751                                                      dsb->pwfx->nBlockAlign * dsb->freqAdjust) *
 752                                               dsb->dsound->device->pwfx->nBlockAlign;
 753                         /* check whether to clip mix_len */
 754                         if (probably_valid_left < mixlen) {
 755                                 TRACE("clipping to probably_valid_left=%ld\n", probably_valid_left);
 756                                 mixlen = probably_valid_left;
 757                         }
 758                 }
 759         }
 760         /* cut mixlen with what's already been mixed */
 761         if (mixlen < primary_done) {
 762                 /* huh? and still CalcPlayPosition didn't
 763                  * detect an underrun? */
 764                 FIXME("problem with underrun detection (mixlen=%ld < primary_done=%ld)\n", mixlen, primary_done);
 765                 return 0;
 766         }
 767         len = mixlen - primary_done;
 768         TRACE("remaining mixlen=%ld\n", len);
 769
 770         if (len < dsb->dsound->device->fraglen) {
 771                 /* smaller than a fragment, wait until it gets larger
 772                  * before we take the mixing overhead */
 773                 TRACE("mixlen not worth it, deferring mixing\n");
 774                 still_behind = 1;
 775                 goto post_mix;
 776         }
 777
 778         /* ok, we know how much to mix, let's go */
 779         still_behind = (adv_done > primary_done);
 780         while (len) {
 781                 slen = dsb->dsound->device->buflen - dsb->primary_mixpos;
 782                 if (slen > len) slen = len;
 783                 slen = DSOUND_MixInBuffer(dsb, dsb->primary_mixpos, slen);
 784
 785                 if ((dsb->primary_mixpos < dsb->dsound->device->mixpos) &&
 786                     (dsb->primary_mixpos + slen >= dsb->dsound->device->mixpos))
 787                         still_behind = FALSE;
 788
 789                 dsb->primary_mixpos += slen; len -= slen;
 790                 dsb->primary_mixpos %= dsb->dsound->device->buflen;
 791
 792                 if ((dsb->state == STATE_STOPPED) || !slen) break;
 793         }
 794         TRACE("new primary_mixpos=%ld, primary_advbase=%ld\n", dsb->primary_mixpos, dsb->dsound->device->mixpos);
 795         TRACE("mixed data len=%ld, still_behind=%d\n", mixlen-len, still_behind);
 796
 797 post_mix:
 798         /* check if buffer should be considered complete */
 799         if (buf_left < dsb->writelead &&
 800             !(dsb->playflags & DSBPLAY_LOOPING)) {
 801                 dsb->state = STATE_STOPPED;
 802                 dsb->playpos = 0;
 803                 dsb->last_playpos = 0;
 804                 dsb->buf_mixpos = 0;
 805                 dsb->leadin = FALSE;
 806                 dsb->need_remix = FALSE;
 807                 DSOUND_CheckEvent(dsb, buf_left);
 808         }
 809
 810         /* return how far we think the primary buffer can
 811          * advance its underrun detector...*/
 812         if (still_behind) return 0;
 813         if ((mixlen - len) < primary_done) return 0;
 814         slen = ((dsb->primary_mixpos < dsb->dsound->device->mixpos) ?
 815                 dsb->dsound->device->buflen : 0) + dsb->primary_mixpos -
 816                 dsb->dsound->device->mixpos;
 817         if (slen > mixlen) {
 818                 /* the primary_done and still_behind checks above should have worked */
 819                 FIXME("problem with advancement calculation (advlen=%ld > mixlen=%ld)\n", slen, mixlen);
 820                 slen = 0;
 821         }
 822         return slen;
 823 }
 824
 825 static DWORD DSOUND_MixToPrimary(DirectSoundDevice *device, DWORD playpos, DWORD writepos, DWORD mixlen, BOOL recover)
 826 {
 827         INT                     i, len, maxlen = 0;
 828         IDirectSoundBufferImpl  *dsb;
 829
 830         TRACE("(%ld,%ld,%ld,%d)\n", playpos, writepos, mixlen, recover);
 831         for (i = 0; i < device->nrofbuffers; i++) {
 832                 dsb = device->buffers[i];
 833
 834                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 835                         TRACE("Checking %p, mixlen=%ld\n", dsb, mixlen);
 836                         EnterCriticalSection(&(dsb->lock));
 837                         if (dsb->state == STATE_STOPPING) {
 838                                 DSOUND_MixCancel(dsb, writepos, TRUE);
 839                                 dsb->state = STATE_STOPPED;
 840                                 DSOUND_CheckEvent(dsb, 0);
 841                         } else {
 842                                 if ((dsb->state == STATE_STARTING) || recover) {
 843                                         dsb->primary_mixpos = writepos;
 844                                         dsb->cvolpan = dsb->volpan;
 845                                         dsb->need_remix = FALSE;
 846                                 }
 847                                 else if (dsb->need_remix) {
 848                                         DSOUND_MixCancel(dsb, writepos, TRUE);
 849                                         dsb->cvolpan = dsb->volpan;
 850                                         dsb->need_remix = FALSE;
 851                                 }
 852                                 len = DSOUND_MixOne(dsb, playpos, writepos, mixlen);
 853                                 if (dsb->state == STATE_STARTING)
 854                                         dsb->state = STATE_PLAYING;
 855                                 maxlen = (len > maxlen) ? len : maxlen;
 856                         }
 857                         LeaveCriticalSection(&(dsb->lock));
 858                 }
 859         }
 860
 861         return maxlen;
 862 }
 863
 864 static void DSOUND_MixReset(DirectSoundDevice *device, DWORD writepos)
 865 {
 866         INT                     i;
 867         IDirectSoundBufferImpl  *dsb;
 868         int nfiller;
 869
 870         TRACE("(%p,%ld)\n", device, writepos);
 871
 872         /* the sound of silence */
 873         nfiller = device->pwfx->wBitsPerSample == 8 ? 128 : 0;
 874
 875         /* reset all buffer mix positions */
 876         for (i = 0; i < device->nrofbuffers; i++) {
 877                 dsb = device->buffers[i];
 878
 879                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 880                         TRACE("Resetting %p\n", dsb);
 881                         EnterCriticalSection(&(dsb->lock));
 882                         if (dsb->state == STATE_STOPPING) {
 883                                 dsb->state = STATE_STOPPED;
 884                         }
 885                         else if (dsb->state == STATE_STARTING) {
 886                                 /* nothing */
 887                         } else {
 888                                 DSOUND_MixCancel(dsb, writepos, FALSE);
 889                                 dsb->cvolpan = dsb->volpan;
 890                                 dsb->need_remix = FALSE;
 891                         }
 892                         LeaveCriticalSection(&(dsb->lock));
 893                 }
 894         }
 895
 896         /* wipe out premixed data */
 897         if (device->mixpos < writepos) {
 898                 FillMemory(device->buffer + writepos, device->buflen - writepos, nfiller);
 899                 FillMemory(device->buffer, device->mixpos, nfiller);
 900         } else {
 901                 FillMemory(device->buffer + writepos, device->mixpos - writepos, nfiller);
 902         }
 903
 904         /* reset primary mix position */
 905         device->mixpos = writepos;
 906 }
 907
 908 static void DSOUND_CheckReset(DirectSoundDevice *device, DWORD writepos)
 909 {
 910         TRACE("(%p,%ld)\n",device,writepos);
 911         if (device->need_remix) {
 912                 DSOUND_MixReset(device, writepos);
 913                 device->need_remix = FALSE;
 914                 /* maximize Half-Life performance */
 915                 device->prebuf = ds_snd_queue_min;
 916                 device->precount = 0;
 917         } else {
 918                 device->precount++;
 919                 if (device->precount >= 4) {
 920                         if (device->prebuf < ds_snd_queue_max)
 921                                 device->prebuf++;
 922                         device->precount = 0;
 923                 }
 924         }
 925         TRACE("premix adjust: %d\n", device->prebuf);
 926 }
 927
 928 void DSOUND_WaveQueue(DirectSoundDevice *device, DWORD mixq)
 929 {
 930         TRACE("(%p,%ld)\n", device, mixq);
 931         if (mixq + device->pwqueue > ds_hel_queue) mixq = ds_hel_queue - device->pwqueue;
 932         TRACE("queueing %ld buffers, starting at %d\n", mixq, device->pwwrite);
 933         for (; mixq; mixq--) {
 934                 waveOutWrite(device->hwo, device->pwave[device->pwwrite], sizeof(WAVEHDR));
 935                 device->pwwrite++;
 936                 if (device->pwwrite >= DS_HEL_FRAGS) device->pwwrite = 0;
 937                 device->pwqueue++;
 938         }
 939 }
 940
 941 /* #define SYNC_CALLBACK */
 942
 943 void DSOUND_PerformMix(DirectSoundDevice *device)
 944 {
 945         int nfiller;
 946         BOOL forced;
 947         HRESULT hres;
 948
 949         TRACE("(%p)\n", device);
 950
 951         /* the sound of silence */
 952         nfiller = device->pwfx->wBitsPerSample == 8 ? 128 : 0;
 953
 954         /* whether the primary is forced to play even without secondary buffers */
 955         forced = ((device->state == STATE_PLAYING) || (device->state == STATE_STARTING));
 956
 957         if (device->priolevel != DSSCL_WRITEPRIMARY) {
 958                 BOOL paused = ((device->state == STATE_STOPPED) || (device->state == STATE_STARTING));
 959                 /* FIXME: document variables */
 960                 DWORD playpos, writepos, inq, maxq, frag;
 961                 if (device->hwbuf) {
 962                         hres = IDsDriverBuffer_GetPosition(device->hwbuf, &playpos, &writepos);
 963                         if (hres) {
 964                             WARN("IDsDriverBuffer_GetPosition failed\n");
 965                             return;
 966                         }
 967                         /* Well, we *could* do Just-In-Time mixing using the writepos,
 968                          * but that's a little bit ambitious and unnecessary... */
 969                         /* rather add our safety margin to the writepos, if we're playing */
 970                         if (!paused) {
 971                                 writepos += device->writelead;
 972                                 writepos %= device->buflen;
 973                         } else writepos = playpos;
 974                 } else {
 975                         playpos = device->pwplay * device->fraglen;
 976                         writepos = playpos;
 977                         if (!paused) {
 978                                 writepos += ds_hel_margin * device->fraglen;
 979                                 writepos %= device->buflen;
 980                         }
 981                 }
 982                 TRACE("primary playpos=%ld, writepos=%ld, clrpos=%ld, mixpos=%ld, buflen=%ld\n",
 983                       playpos,writepos,device->playpos,device->mixpos,device->buflen);
 984                 assert(device->playpos < device->buflen);
 985                 /* wipe out just-played sound data */
 986                 if (playpos < device->playpos) {
 987                         FillMemory(device->buffer + device->playpos, device->buflen - device->playpos, nfiller);
 988                         FillMemory(device->buffer, playpos, nfiller);
 989                 } else {
 990                         FillMemory(device->buffer + device->playpos, playpos - device->playpos, nfiller);
 991                 }
 992                 device->playpos = playpos;
 993
 994                 EnterCriticalSection(&(device->mixlock));
 995
 996                 /* reset mixing if necessary */
 997                 DSOUND_CheckReset(device, writepos);
 998
 999                 /* check how much prebuffering is left */
1000                 inq = device->mixpos;
1001                 if (inq < writepos)
1002                         inq += device->buflen;
1003                 inq -= writepos;
1004
1005                 /* find the maximum we can prebuffer */
1006                 if (!paused) {
1007                         maxq = playpos;
1008                         if (maxq < writepos)
1009                                 maxq += device->buflen;
1010                         maxq -= writepos;
1011                 } else maxq = device->buflen;
1012
1013                 /* clip maxq to device->prebuf */
1014                 frag = device->prebuf * device->fraglen;
1015                 if (maxq > frag) maxq = frag;
1016
1017                 /* check for consistency */
1018                 if (inq > maxq) {
1019                         /* the playback position must have passed our last
1020                          * mixed position, i.e. it's an underrun, or we have
1021                          * nothing more to play */
1022                         TRACE("reached end of mixed data (inq=%ld, maxq=%ld)\n", inq, maxq);
1023                         inq = 0;
1024                         /* stop the playback now, to allow buffers to refill */
1025                         if (device->state == STATE_PLAYING) {
1026                                 device->state = STATE_STARTING;
1027                         }
1028                         else if (device->state == STATE_STOPPING) {
1029                                 device->state = STATE_STOPPED;
1030                         }
1031                         else {
1032                                 /* how can we have an underrun if we aren't playing? */
1033                                 WARN("unexpected primary state (%ld)\n", device->state);
1034                         }
1035 #ifdef SYNC_CALLBACK
1036                         /* DSOUND_callback may need this lock */
1037                         LeaveCriticalSection(&(device->mixlock));
1038 #endif
1039                         if (DSOUND_PrimaryStop(device) != DS_OK)
1040                                 WARN("DSOUND_PrimaryStop failed\n");
1041 #ifdef SYNC_CALLBACK
1042                         EnterCriticalSection(&(device->mixlock));
1043 #endif
1044                         if (device->hwbuf) {
1045                                 /* the Stop is supposed to reset play position to beginning of buffer */
1046                                 /* unfortunately, OSS is not able to do so, so get current pointer */
1047                                 hres = IDsDriverBuffer_GetPosition(device->hwbuf, &playpos, NULL);
1048                                 if (hres) {
1049                                         LeaveCriticalSection(&(device->mixlock));
1050                                         WARN("IDsDriverBuffer_GetPosition failed\n");
1051                                         return;
1052                                 }
1053                         } else {
1054                                 playpos = device->pwplay * device->fraglen;
1055                         }
1056                         writepos = playpos;
1057                         device->playpos = playpos;
1058                         device->mixpos = writepos;
1059                         inq = 0;
1060                         maxq = device->buflen;
1061                         if (maxq > frag) maxq = frag;
1062                         FillMemory(device->buffer, device->buflen, nfiller);
1063                         paused = TRUE;
1064                 }
1065
1066                 /* do the mixing */
1067                 frag = DSOUND_MixToPrimary(device, playpos, writepos, maxq, paused);
1068                 if (forced) frag = maxq - inq;
1069                 device->mixpos += frag;
1070                 device->mixpos %= device->buflen;
1071
1072                 if (frag) {
1073                         /* buffers have been filled, restart playback */
1074                         if (device->state == STATE_STARTING) {
1075                                 device->state = STATE_PLAYING;
1076                         }
1077                         else if (device->state == STATE_STOPPED) {
1078                                 /* the dsound is supposed to play if there's something to play
1079                                  * even if it is reported as stopped, so don't let this confuse you */
1080                                 device->state = STATE_STOPPING;
1081                         }
1082                         LeaveCriticalSection(&(device->mixlock));
1083                         if (paused) {
1084                                 if (DSOUND_PrimaryPlay(device) != DS_OK)
1085                                         WARN("DSOUND_PrimaryPlay failed\n");
1086                                 else
1087                                         TRACE("starting playback\n");
1088                         }
1089                 }
1090                 else
1091                         LeaveCriticalSection(&(device->mixlock));
1092         } else {
1093                 /* in the DSSCL_WRITEPRIMARY mode, the app is totally in charge... */
1094                 if (device->state == STATE_STARTING) {
1095                         if (DSOUND_PrimaryPlay(device) != DS_OK)
1096                                 WARN("DSOUND_PrimaryPlay failed\n");
1097                         else
1098                                 device->state = STATE_PLAYING;
1099                 }
1100                 else if (device->state == STATE_STOPPING) {
1101                         if (DSOUND_PrimaryStop(device) != DS_OK)
1102                                 WARN("DSOUND_PrimaryStop failed\n");
1103                         else
1104                                 device->state = STATE_STOPPED;
1105                 }
1106         }
1107 }
1108
1109 void CALLBACK DSOUND_timer(UINT timerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1110 {
1111         DirectSoundDevice * device = (DirectSoundDevice*)dwUser;
1112         DWORD start_time =  GetTickCount();
1113         DWORD end_time;
1114         TRACE("(%d,%d,0x%lx,0x%lx,0x%lx)\n",timerID,msg,dwUser,dw1,dw2);
1115         TRACE("entering at %ld\n", start_time);
1116
1117         if (DSOUND_renderer[device->drvdesc.dnDevNode] != device) {
1118                 ERR("dsound died without killing us?\n");
1119                 timeKillEvent(timerID);
1120                 timeEndPeriod(DS_TIME_RES);
1121                 return;
1122         }
1123
1124         RtlAcquireResourceShared(&(device->buffer_list_lock), TRUE);
1125
1126         if (device->ref)
1127                 DSOUND_PerformMix(device);
1128
1129         RtlReleaseResource(&(device->buffer_list_lock));
1130
1131         end_time = GetTickCount();
1132         TRACE("completed processing at %ld, duration = %ld\n", end_time, end_time - start_time);
1133 }
1134
1135 void CALLBACK DSOUND_callback(HWAVEOUT hwo, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
1136 {
1137         DirectSoundDevice * device = (DirectSoundDevice*)dwUser;
1138         TRACE("(%p,%x,%lx,%lx,%lx)\n",hwo,msg,dwUser,dw1,dw2);
1139         TRACE("entering at %ld, msg=%08x(%s)\n", GetTickCount(), msg,
1140                 msg==MM_WOM_DONE ? "MM_WOM_DONE" : msg==MM_WOM_CLOSE ? "MM_WOM_CLOSE" :
1141                 msg==MM_WOM_OPEN ? "MM_WOM_OPEN" : "UNKNOWN");
1142         if (msg == MM_WOM_DONE) {
1143                 DWORD inq, mixq, fraglen, buflen, pwplay, playpos, mixpos;
1144                 if (device->pwqueue == (DWORD)-1) {
1145                         TRACE("completed due to reset\n");
1146                         return;
1147                 }
1148 /* it could be a bad idea to enter critical section here... if there's lock contention,
1149  * the resulting scheduling delays might obstruct the winmm player thread */
1150 #ifdef SYNC_CALLBACK
1151                 EnterCriticalSection(&(device->mixlock));
1152 #endif
1153                 /* retrieve current values */
1154                 fraglen = device->fraglen;
1155                 buflen = device->buflen;
1156                 pwplay = device->pwplay;
1157                 playpos = pwplay * fraglen;
1158                 mixpos = device->mixpos;
1159                 /* check remaining mixed data */
1160                 inq = ((mixpos < playpos) ? buflen : 0) + mixpos - playpos;
1161                 mixq = inq / fraglen;
1162                 if ((inq - (mixq * fraglen)) > 0) mixq++;
1163                 /* complete the playing buffer */
1164                 TRACE("done playing primary pos=%ld\n", playpos);
1165                 pwplay++;
1166                 if (pwplay >= DS_HEL_FRAGS) pwplay = 0;
1167                 /* write new values */
1168                 device->pwplay = pwplay;
1169                 device->pwqueue--;
1170                 /* queue new buffer if we have data for it */
1171                 if (inq>1) DSOUND_WaveQueue(device, inq-1);
1172 #ifdef SYNC_CALLBACK
1173                 LeaveCriticalSection(&(device->mixlock));
1174 #endif
1175         }
1176         TRACE("completed\n");
1177 }