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   1 /*                      DirectSound
   2  *
   3  * Copyright 1998 Marcus Meissner
   4  * Copyright 1998 Rob Riggs
   5  * Copyright 2000-2002 TransGaming Technologies, Inc.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "config.h"
  23 #include <assert.h>
  24 #include <stdio.h>
  25 #include <sys/types.h>
  26 #include <sys/fcntl.h>
  27 #ifdef HAVE_UNISTD_H
  28 # include <unistd.h>
  29 #endif
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <math.h>       /* Insomnia - pow() function */
  33
  34 #include "windef.h"
  35 #include "winbase.h"
  36 #include "wingdi.h"
  37 #include "winuser.h"
  38 #include "winerror.h"
  39 #include "mmsystem.h"
  40 #include "winternl.h"
  41 #include "mmddk.h"
  42 #include "wine/windef16.h"
  43 #include "wine/debug.h"
  44 #include "dsound.h"
  45 #include "dsdriver.h"
  46 #include "dsound_private.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(dsound);
  49
  50 void DSOUND_RecalcVolPan(PDSVOLUMEPAN volpan)
  51 {
  52         double temp;
  53
  54         /* the AmpFactors are expressed in 16.16 fixed point */
  55         volpan->dwVolAmpFactor = (ULONG) (pow(2.0, volpan->lVolume / 600.0) * 65536);
  56         /* FIXME: dwPan{Left|Right}AmpFactor */
  57
  58         /* FIXME: use calculated vol and pan ampfactors */
  59         temp = (double) (volpan->lVolume - (volpan->lPan > 0 ? volpan->lPan : 0));
  60         volpan->dwTotalLeftAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 65536);
  61         temp = (double) (volpan->lVolume + (volpan->lPan < 0 ? volpan->lPan : 0));
  62         volpan->dwTotalRightAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 65536);
  63
  64         TRACE("left = %lx, right = %lx\n", volpan->dwTotalLeftAmpFactor, volpan->dwTotalRightAmpFactor);
  65 }
  66
  67 void DSOUND_RecalcFormat(IDirectSoundBufferImpl *dsb)
  68 {
  69         DWORD sw;
  70
  71         sw = dsb->wfx.nChannels * (dsb->wfx.wBitsPerSample / 8);
  72         /* calculate the 10ms write lead */
  73         dsb->writelead = (dsb->freq / 100) * sw;
  74 }
  75
  76 void DSOUND_CheckEvent(IDirectSoundBufferImpl *dsb, int len)
  77 {
  78         int                     i;
  79         DWORD                   offset;
  80         LPDSBPOSITIONNOTIFY     event;
  81
  82         if (dsb->nrofnotifies == 0)
  83                 return;
  84
  85         TRACE("(%p) buflen = %ld, playpos = %ld, len = %d\n",
  86                 dsb, dsb->buflen, dsb->playpos, len);
  87         for (i = 0; i < dsb->nrofnotifies ; i++) {
  88                 event = dsb->notifies + i;
  89                 offset = event->dwOffset;
  90                 TRACE("checking %d, position %ld, event = %p\n",
  91                         i, offset, event->hEventNotify);
  92                 /* DSBPN_OFFSETSTOP has to be the last element. So this is */
  93                 /* OK. [Inside DirectX, p274] */
  94                 /*  */
  95                 /* This also means we can't sort the entries by offset, */
  96                 /* because DSBPN_OFFSETSTOP == -1 */
  97                 if (offset == DSBPN_OFFSETSTOP) {
  98                         if (dsb->state == STATE_STOPPED) {
  99                                 SetEvent(event->hEventNotify);
 100                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 101                                 return;
 102                         } else
 103                                 return;
 104                 }
 105                 if ((dsb->playpos + len) >= dsb->buflen) {
 106                         if ((offset < ((dsb->playpos + len) % dsb->buflen)) ||
 107                             (offset >= dsb->playpos)) {
 108                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 109                                 SetEvent(event->hEventNotify);
 110                         }
 111                 } else {
 112                         if ((offset >= dsb->playpos) && (offset < (dsb->playpos + len))) {
 113                                 TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
 114                                 SetEvent(event->hEventNotify);
 115                         }
 116                 }
 117         }
 118 }
 119
 120 /* WAV format info can be found at:
 121  *
 122  *    http://www.cwi.nl/ftp/audio/AudioFormats.part2
 123  *    ftp://ftp.cwi.nl/pub/audio/RIFF-format
 124  *
 125  * Import points to remember:
 126  *    8-bit WAV is unsigned
 127  *    16-bit WAV is signed
 128  */
 129  /* Use the same formulas as pcmconverter.c */
 130 static inline INT16 cvtU8toS16(BYTE b)
 131 {
 132     return (short)((b+(b << 8))-32768);
 133 }
 134
 135 static inline BYTE cvtS16toU8(INT16 s)
 136 {
 137     return (s >> 8) ^ (unsigned char)0x80;
 138 }
 139
 140 static inline void cp_fields(const IDirectSoundBufferImpl *dsb, BYTE *ibuf, BYTE *obuf )
 141 {
 142         INT fl,fr;
 143
 144         if (dsb->wfx.wBitsPerSample == 8)  {
 145                 if (dsound->wfx.wBitsPerSample == 8 &&
 146                     dsound->wfx.nChannels == dsb->wfx.nChannels) {
 147                         /* avoid needless 8->16->8 conversion */
 148                         *obuf=*ibuf;
 149                         if (dsb->wfx.nChannels==2)
 150                                 *(obuf+1)=*(ibuf+1);
 151                         return;
 152                 }
 153                 fl = cvtU8toS16(*ibuf);
 154                 fr = (dsb->wfx.nChannels==2 ? cvtU8toS16(*(ibuf + 1)) : fl);
 155         } else {
 156                 fl = *((INT16 *)ibuf);
 157                 fr = (dsb->wfx.nChannels==2 ? *(((INT16 *)ibuf) + 1)  : fl);
 158         }
 159
 160         if (dsound->wfx.nChannels == 2) {
 161                 if (dsound->wfx.wBitsPerSample == 8) {
 162                         *obuf = cvtS16toU8(fl);
 163                         *(obuf + 1) = cvtS16toU8(fr);
 164                         return;
 165                 }
 166                 if (dsound->wfx.wBitsPerSample == 16) {
 167                         *((INT16 *)obuf) = fl;
 168                         *(((INT16 *)obuf) + 1) = fr;
 169                         return;
 170                 }
 171         }
 172         if (dsound->wfx.nChannels == 1) {
 173                 fl = (fl + fr) >> 1;
 174                 if (dsound->wfx.wBitsPerSample == 8) {
 175                         *obuf = cvtS16toU8(fl);
 176                         return;
 177                 }
 178                 if (dsound->wfx.wBitsPerSample == 16) {
 179                         *((INT16 *)obuf) = fl;
 180                         return;
 181                 }
 182         }
 183 }
 184
 185 /* Now with PerfectPitch (tm) technology */
 186 static INT DSOUND_MixerNorm(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
 187 {
 188         INT     i, size, ipos, ilen;
 189         BYTE    *ibp, *obp;
 190         INT     iAdvance = dsb->wfx.nBlockAlign;
 191         INT     oAdvance = dsb->dsound->wfx.nBlockAlign;
 192
 193         ibp = dsb->buffer + dsb->buf_mixpos;
 194         obp = buf;
 195
 196         TRACE("(%p, %p, %p), buf_mixpos=%ld\n", dsb, ibp, obp, dsb->buf_mixpos);
 197         /* Check for the best case */
 198         if ((dsb->freq == dsb->dsound->wfx.nSamplesPerSec) &&
 199             (dsb->wfx.wBitsPerSample == dsb->dsound->wfx.wBitsPerSample) &&
 200             (dsb->wfx.nChannels == dsb->dsound->wfx.nChannels)) {
 201                 DWORD bytesleft = dsb->buflen - dsb->buf_mixpos;
 202                 TRACE("(%p) Best case\n", dsb);
 203                 if (len <= bytesleft )
 204                         memcpy(obp, ibp, len);
 205                 else { /* wrap */
 206                         memcpy(obp, ibp, bytesleft );
 207                         memcpy(obp + bytesleft, dsb->buffer, len - bytesleft);
 208                 }
 209                 return len;
 210         }
 211
 212         /* Check for same sample rate */
 213         if (dsb->freq == dsb->dsound->wfx.nSamplesPerSec) {
 214                 TRACE("(%p) Same sample rate %ld = primary %ld\n", dsb,
 215                         dsb->freq, dsb->dsound->wfx.nSamplesPerSec);
 216                 ilen = 0;
 217                 for (i = 0; i < len; i += oAdvance) {
 218                         cp_fields(dsb, ibp, obp );
 219                         ibp += iAdvance;
 220                         ilen += iAdvance;
 221                         obp += oAdvance;
 222                         if (ibp >= (BYTE *)(dsb->buffer + dsb->buflen))
 223                                 ibp = dsb->buffer;      /* wrap */
 224                 }
 225                 return (ilen);
 226         }
 227
 228         /* Mix in different sample rates */
 229         /* */
 230         /* New PerfectPitch(tm) Technology (c) 1998 Rob Riggs */
 231         /* Patent Pending :-] */
 232
 233         /* Patent enhancements (c) 2000 Ove Kåven,
 234          * TransGaming Technologies Inc. */
 235
 236         /* FIXME("(%p) Adjusting frequency: %ld -> %ld (need optimization)\n",
 237            dsb, dsb->freq, dsb->dsound->wfx.nSamplesPerSec); */
 238
 239         size = len / oAdvance;
 240         ilen = 0;
 241         ipos = dsb->buf_mixpos;
 242         for (i = 0; i < size; i++) {
 243                 cp_fields(dsb, (dsb->buffer + ipos), obp);
 244                 obp += oAdvance;
 245                 dsb->freqAcc += dsb->freqAdjust;
 246                 if (dsb->freqAcc >= (1<<DSOUND_FREQSHIFT)) {
 247                         ULONG adv = (dsb->freqAcc>>DSOUND_FREQSHIFT) * iAdvance;
 248                         dsb->freqAcc &= (1<<DSOUND_FREQSHIFT)-1;
 249                         ipos += adv; ilen += adv;
 250                         while (ipos >= dsb->buflen)
 251                                 ipos -= dsb->buflen;
 252                 }
 253         }
 254         return ilen;
 255 }
 256
 257 static void DSOUND_MixerVol(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
 258 {
 259         INT     i, inc = dsb->dsound->wfx.wBitsPerSample >> 3;
 260         BYTE    *bpc = buf;
 261         INT16   *bps = (INT16 *) buf;
 262
 263         TRACE("(%p) left = %lx, right = %lx\n", dsb,
 264                 dsb->cvolpan.dwTotalLeftAmpFactor, dsb->cvolpan.dwTotalRightAmpFactor);
 265         if ((!(dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) || (dsb->cvolpan.lPan == 0)) &&
 266             (!(dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) || (dsb->cvolpan.lVolume == 0)) &&
 267             !(dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
 268                 return;         /* Nothing to do */
 269
 270         /* If we end up with some bozo coder using panning or 3D sound */
 271         /* with a mono primary buffer, it could sound very weird using */
 272         /* this method. Oh well, tough patooties. */
 273
 274         for (i = 0; i < len; i += inc) {
 275                 INT     val;
 276
 277                 switch (inc) {
 278
 279                 case 1:
 280                         /* 8-bit WAV is unsigned, but we need to operate */
 281                         /* on signed data for this to work properly */
 282                         val = *bpc - 128;
 283                         val = ((val * (i & inc ? dsb->cvolpan.dwTotalRightAmpFactor : dsb->cvolpan.dwTotalLeftAmpFactor)) >> 16);
 284                         *bpc = val + 128;
 285                         bpc++;
 286                         break;
 287                 case 2:
 288                         /* 16-bit WAV is signed -- much better */
 289                         val = *bps;
 290                         val = ((val * ((i & inc) ? dsb->cvolpan.dwTotalRightAmpFactor : dsb->cvolpan.dwTotalLeftAmpFactor)) >> 16);
 291                         *bps = val;
 292                         bps++;
 293                         break;
 294                 default:
 295                         /* Very ugly! */
 296                         FIXME("MixerVol had a nasty error\n");
 297                 }
 298         }
 299 }
 300
 301 static void *tmp_buffer;
 302 static size_t tmp_buffer_len = 0;
 303
 304 static void *DSOUND_tmpbuffer(size_t len)
 305 {
 306   if (len>tmp_buffer_len) {
 307     void *new_buffer = realloc(tmp_buffer, len);
 308     if (new_buffer) {
 309       tmp_buffer = new_buffer;
 310       tmp_buffer_len = len;
 311     }
 312     return new_buffer;
 313   }
 314   return tmp_buffer;
 315 }
 316
 317 static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD fraglen)
 318 {
 319         INT     i, len, ilen, temp, field;
 320         INT     advance = dsb->dsound->wfx.wBitsPerSample >> 3;
 321         BYTE    *buf, *ibuf, *obuf;
 322         INT16   *ibufs, *obufs;
 323
 324         len = fraglen;
 325         if (!(dsb->playflags & DSBPLAY_LOOPING)) {
 326                 temp = MulDiv(dsb->dsound->wfx.nAvgBytesPerSec, dsb->buflen,
 327                         dsb->nAvgBytesPerSec) -
 328                        MulDiv(dsb->dsound->wfx.nAvgBytesPerSec, dsb->buf_mixpos,
 329                         dsb->nAvgBytesPerSec);
 330                 len = (len > temp) ? temp : len;
 331         }
 332         len &= ~3;                              /* 4 byte alignment */
 333
 334         if (len == 0) {
 335                 /* This should only happen if we aren't looping and temp < 4 */
 336                 return 0;
 337         }
 338
 339         /* Been seeing segfaults in malloc() for some reason... */
 340         TRACE("allocating buffer (size = %d)\n", len);
 341         if ((buf = ibuf = (BYTE *) DSOUND_tmpbuffer(len)) == NULL)
 342                 return 0;
 343
 344         TRACE("MixInBuffer (%p) len = %d, dest = %ld\n", dsb, len, writepos);
 345
 346         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 347         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 348             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME))
 349                 DSOUND_MixerVol(dsb, ibuf, len);
 350
 351         obuf = dsb->dsound->buffer + writepos;
 352         for (i = 0; i < len; i += advance) {
 353                 obufs = (INT16 *) obuf;
 354                 ibufs = (INT16 *) ibuf;
 355                 if (dsb->dsound->wfx.wBitsPerSample == 8) {
 356                         /* 8-bit WAV is unsigned */
 357                         field = (*ibuf - 128);
 358                         field += (*obuf - 128);
 359                         field = field > 127 ? 127 : field;
 360                         field = field < -128 ? -128 : field;
 361                         *obuf = field + 128;
 362                 } else {
 363                         /* 16-bit WAV is signed */
 364                         field = *ibufs;
 365                         field += *obufs;
 366                         field = field > 32767 ? 32767 : field;
 367                         field = field < -32768 ? -32768 : field;
 368                         *obufs = field;
 369                 }
 370                 ibuf += advance;
 371                 obuf += advance;
 372                 if (obuf >= (BYTE *)(dsb->dsound->buffer + dsb->dsound->buflen))
 373                         obuf = dsb->dsound->buffer;
 374         }
 375         /* free(buf); */
 376
 377         if (dsb->leadin && (dsb->startpos > dsb->buf_mixpos) && (dsb->startpos <= dsb->buf_mixpos + ilen)) {
 378                 /* HACK... leadin should be reset when the PLAY position reaches the startpos,
 379                  * not the MIX position... but if the sound buffer is bigger than our prebuffering
 380                  * (which must be the case for the streaming buffers that need this hack anyway)
 381                  * plus DS_HEL_MARGIN or equivalent, then this ought to work anyway. */
 382                 dsb->leadin = FALSE;
 383         }
 384
 385         dsb->buf_mixpos += ilen;
 386
 387         if (dsb->buf_mixpos >= dsb->buflen) {
 388                 if (dsb->playflags & DSBPLAY_LOOPING) {
 389                         /* wrap */
 390                         while (dsb->buf_mixpos >= dsb->buflen)
 391                                 dsb->buf_mixpos -= dsb->buflen;
 392                         if (dsb->leadin && (dsb->startpos <= dsb->buf_mixpos))
 393                                 dsb->leadin = FALSE; /* HACK: see above */
 394                 }
 395         }
 396
 397         return len;
 398 }
 399
 400 static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD len)
 401 {
 402         INT     i, ilen, field;
 403         INT     advance = dsb->dsound->wfx.wBitsPerSample >> 3;
 404         BYTE    *buf, *ibuf, *obuf;
 405         INT16   *ibufs, *obufs;
 406
 407         len &= ~3;                              /* 4 byte alignment */
 408
 409         TRACE("allocating buffer (size = %ld)\n", len);
 410         if ((buf = ibuf = (BYTE *) DSOUND_tmpbuffer(len)) == NULL)
 411                 return;
 412
 413         TRACE("PhaseCancel (%p) len = %ld, dest = %ld\n", dsb, len, writepos);
 414
 415         ilen = DSOUND_MixerNorm(dsb, ibuf, len);
 416         if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
 417             (dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME))
 418                 DSOUND_MixerVol(dsb, ibuf, len);
 419
 420         /* subtract instead of add, to phase out premixed data */
 421         obuf = dsb->dsound->buffer + writepos;
 422         for (i = 0; i < len; i += advance) {
 423                 obufs = (INT16 *) obuf;
 424                 ibufs = (INT16 *) ibuf;
 425                 if (dsb->dsound->wfx.wBitsPerSample == 8) {
 426                         /* 8-bit WAV is unsigned */
 427                         field = (*ibuf - 128);
 428                         field -= (*obuf - 128);
 429                         field = field > 127 ? 127 : field;
 430                         field = field < -128 ? -128 : field;
 431                         *obuf = field + 128;
 432                 } else {
 433                         /* 16-bit WAV is signed */
 434                         field = *ibufs;
 435                         field -= *obufs;
 436                         field = field > 32767 ? 32767 : field;
 437                         field = field < -32768 ? -32768 : field;
 438                         *obufs = field;
 439                 }
 440                 ibuf += advance;
 441                 obuf += advance;
 442                 if (obuf >= (BYTE *)(dsb->dsound->buffer + dsb->dsound->buflen))
 443                         obuf = dsb->dsound->buffer;
 444         }
 445         /* free(buf); */
 446 }
 447
 448 static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)
 449 {
 450         DWORD   size, flen, len, npos, nlen;
 451         INT     iAdvance = dsb->wfx.nBlockAlign;
 452         INT     oAdvance = dsb->dsound->wfx.nBlockAlign;
 453         /* determine amount of premixed data to cancel */
 454         DWORD primary_done =
 455                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
 456                 dsb->primary_mixpos - writepos;
 457
 458         TRACE("(%p, %ld), buf_mixpos=%ld\n", dsb, writepos, dsb->buf_mixpos);
 459
 460         /* backtrack the mix position */
 461         size = primary_done / oAdvance;
 462         flen = size * dsb->freqAdjust;
 463         len = (flen >> DSOUND_FREQSHIFT) * iAdvance;
 464         flen &= (1<<DSOUND_FREQSHIFT)-1;
 465         while (dsb->freqAcc < flen) {
 466                 len += iAdvance;
 467                 dsb->freqAcc += 1<<DSOUND_FREQSHIFT;
 468         }
 469         len %= dsb->buflen;
 470         npos = ((dsb->buf_mixpos < len) ? dsb->buflen : 0) +
 471                 dsb->buf_mixpos - len;
 472         if (dsb->leadin && (dsb->startpos > npos) && (dsb->startpos <= npos + len)) {
 473                 /* stop backtracking at startpos */
 474                 npos = dsb->startpos;
 475                 len = ((dsb->buf_mixpos < npos) ? dsb->buflen : 0) +
 476                         dsb->buf_mixpos - npos;
 477                 flen = dsb->freqAcc;
 478                 nlen = len / dsb->wfx.nBlockAlign;
 479                 nlen = ((nlen << DSOUND_FREQSHIFT) + flen) / dsb->freqAdjust;
 480                 nlen *= dsb->dsound->wfx.nBlockAlign;
 481                 writepos =
 482                         ((dsb->primary_mixpos < nlen) ? dsb->dsound->buflen : 0) +
 483                         dsb->primary_mixpos - nlen;
 484         }
 485
 486         dsb->freqAcc -= flen;
 487         dsb->buf_mixpos = npos;
 488         dsb->primary_mixpos = writepos;
 489
 490         TRACE("new buf_mixpos=%ld, primary_mixpos=%ld (len=%ld)\n",
 491               dsb->buf_mixpos, dsb->primary_mixpos, len);
 492
 493         if (cancel) DSOUND_PhaseCancel(dsb, writepos, len);
 494 }
 495
 496 void DSOUND_MixCancelAt(IDirectSoundBufferImpl *dsb, DWORD buf_writepos)
 497 {
 498 #if 0
 499         DWORD   i, size, flen, len, npos, nlen;
 500         INT     iAdvance = dsb->wfx.nBlockAlign;
 501         INT     oAdvance = dsb->dsound->wfx.nBlockAlign;
 502         /* determine amount of premixed data to cancel */
 503         DWORD buf_done =
 504                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 505                 dsb->buf_mixpos - buf_writepos;
 506 #endif
 507
 508         WARN("(%p, %ld), buf_mixpos=%ld\n", dsb, buf_writepos, dsb->buf_mixpos);
 509         /* since this is not implemented yet, just cancel *ALL* prebuffering for now
 510          * (which is faster anyway when there's only a single secondary buffer) */
 511         dsb->dsound->need_remix = TRUE;
 512 }
 513
 514 void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
 515 {
 516         EnterCriticalSection(&dsb->lock);
 517         if (dsb->state == STATE_PLAYING) {
 518 #if 0 /* this may not be quite reliable yet */
 519                 dsb->need_remix = TRUE;
 520 #else
 521                 dsb->dsound->need_remix = TRUE;
 522 #endif
 523         }
 524         LeaveCriticalSection(&dsb->lock);
 525 }
 526
 527 static DWORD DSOUND_MixOne(IDirectSoundBufferImpl *dsb, DWORD playpos, DWORD writepos, DWORD mixlen)
 528 {
 529         DWORD len, slen;
 530         /* determine this buffer's write position */
 531         DWORD buf_writepos = DSOUND_CalcPlayPosition(dsb, dsb->state & dsb->dsound->state, writepos,
 532                                                      writepos, dsb->primary_mixpos, dsb->buf_mixpos);
 533         /* determine how much already-mixed data exists */
 534         DWORD buf_done =
 535                 ((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
 536                 dsb->buf_mixpos - buf_writepos;
 537         DWORD primary_done =
 538                 ((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
 539                 dsb->primary_mixpos - writepos;
 540         DWORD adv_done =
 541                 ((dsb->dsound->mixpos < writepos) ? dsb->dsound->buflen : 0) +
 542                 dsb->dsound->mixpos - writepos;
 543         DWORD played =
 544                 ((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
 545                 buf_writepos - dsb->playpos;
 546         DWORD buf_left = dsb->buflen - buf_writepos;
 547         int still_behind;
 548
 549         TRACE("buf_writepos=%ld, primary_writepos=%ld\n", buf_writepos, writepos);
 550         TRACE("buf_done=%ld, primary_done=%ld\n", buf_done, primary_done);
 551         TRACE("buf_mixpos=%ld, primary_mixpos=%ld, mixlen=%ld\n", dsb->buf_mixpos, dsb->primary_mixpos,
 552               mixlen);
 553         TRACE("looping=%ld, startpos=%ld, leadin=%ld\n", dsb->playflags, dsb->startpos, dsb->leadin);
 554
 555         /* check for notification positions */
 556         if (dsb->dsbd.dwFlags & DSBCAPS_CTRLPOSITIONNOTIFY &&
 557             dsb->state != STATE_STARTING) {
 558                 DSOUND_CheckEvent(dsb, played);
 559         }
 560
 561         /* save write position for non-GETCURRENTPOSITION2... */
 562         dsb->playpos = buf_writepos;
 563
 564         /* check whether CalcPlayPosition detected a mixing underrun */
 565         if ((buf_done == 0) && (dsb->primary_mixpos != writepos)) {
 566                 /* it did, but did we have more to play? */
 567                 if ((dsb->playflags & DSBPLAY_LOOPING) ||
 568                     (dsb->buf_mixpos < dsb->buflen)) {
 569                         /* yes, have to recover */
 570                         ERR("underrun on sound buffer %p\n", dsb);
 571                         TRACE("recovering from underrun: primary_mixpos=%ld\n", writepos);
 572                 }
 573                 dsb->primary_mixpos = writepos;
 574                 primary_done = 0;
 575         }
 576         /* determine how far ahead we should mix */
 577         if (((dsb->playflags & DSBPLAY_LOOPING) ||
 578              (dsb->leadin && (dsb->probably_valid_to != 0))) &&
 579             !(dsb->dsbd.dwFlags & DSBCAPS_STATIC)) {
 580                 /* if this is a streaming buffer, it typically means that
 581                  * we should defer mixing past probably_valid_to as long
 582                  * as we can, to avoid unnecessary remixing */
 583                 /* the heavy-looking calculations shouldn't be that bad,
 584                  * as any game isn't likely to be have more than 1 or 2
 585                  * streaming buffers in use at any time anyway... */
 586                 DWORD probably_valid_left =
 587                         (dsb->probably_valid_to == (DWORD)-1) ? dsb->buflen :
 588                         ((dsb->probably_valid_to < buf_writepos) ? dsb->buflen : 0) +
 589                         dsb->probably_valid_to - buf_writepos;
 590                 /* check for leadin condition */
 591                 if ((probably_valid_left == 0) &&
 592                     (dsb->probably_valid_to == dsb->startpos) &&
 593                     dsb->leadin)
 594                         probably_valid_left = dsb->buflen;
 595                 TRACE("streaming buffer probably_valid_to=%ld, probably_valid_left=%ld\n",
 596                       dsb->probably_valid_to, probably_valid_left);
 597                 /* check whether the app's time is already up */
 598                 if (probably_valid_left < dsb->writelead) {
 599                         WARN("probably_valid_to now within writelead, possible streaming underrun\n");
 600                         /* once we pass the point of no return,
 601                          * no reason to hold back anymore */
 602                         dsb->probably_valid_to = (DWORD)-1;
 603                         /* we just have to go ahead and mix what we have,
 604                          * there's no telling what the app is thinking anyway */
 605                 } else {
 606                         /* adjust for our frequency and our sample size */
 607                         probably_valid_left = MulDiv(probably_valid_left,
 608                                                      1 << DSOUND_FREQSHIFT,
 609                                                      dsb->wfx.nBlockAlign * dsb->freqAdjust) *
 610                                               dsb->dsound->wfx.nBlockAlign;
 611                         /* check whether to clip mix_len */
 612                         if (probably_valid_left < mixlen) {
 613                                 TRACE("clipping to probably_valid_left=%ld\n", probably_valid_left);
 614                                 mixlen = probably_valid_left;
 615                         }
 616                 }
 617         }
 618         /* cut mixlen with what's already been mixed */
 619         if (mixlen < primary_done) {
 620                 /* huh? and still CalcPlayPosition didn't
 621                  * detect an underrun? */
 622                 FIXME("problem with underrun detection (mixlen=%ld < primary_done=%ld)\n", mixlen, primary_done);
 623                 return 0;
 624         }
 625         len = mixlen - primary_done;
 626         TRACE("remaining mixlen=%ld\n", len);
 627
 628         if (len < dsb->dsound->fraglen) {
 629                 /* smaller than a fragment, wait until it gets larger
 630                  * before we take the mixing overhead */
 631                 TRACE("mixlen not worth it, deferring mixing\n");
 632                 still_behind = 1;
 633                 goto post_mix;
 634         }
 635
 636         /* ok, we know how much to mix, let's go */
 637         still_behind = (adv_done > primary_done);
 638         while (len) {
 639                 slen = dsb->dsound->buflen - dsb->primary_mixpos;
 640                 if (slen > len) slen = len;
 641                 slen = DSOUND_MixInBuffer(dsb, dsb->primary_mixpos, slen);
 642
 643                 if ((dsb->primary_mixpos < dsb->dsound->mixpos) &&
 644                     (dsb->primary_mixpos + slen >= dsb->dsound->mixpos))
 645                         still_behind = FALSE;
 646
 647                 dsb->primary_mixpos += slen; len -= slen;
 648                 while (dsb->primary_mixpos >= dsb->dsound->buflen)
 649                         dsb->primary_mixpos -= dsb->dsound->buflen;
 650
 651                 if ((dsb->state == STATE_STOPPED) || !slen) break;
 652         }
 653         TRACE("new primary_mixpos=%ld, primary_advbase=%ld\n", dsb->primary_mixpos, dsb->dsound->mixpos);
 654         TRACE("mixed data len=%ld, still_behind=%d\n", mixlen-len, still_behind);
 655
 656 post_mix:
 657         /* check if buffer should be considered complete */
 658         if (buf_left < dsb->writelead &&
 659             !(dsb->playflags & DSBPLAY_LOOPING)) {
 660                 dsb->state = STATE_STOPPED;
 661                 dsb->playpos = 0;
 662                 dsb->last_playpos = 0;
 663                 dsb->buf_mixpos = 0;
 664                 dsb->leadin = FALSE;
 665                 DSOUND_CheckEvent(dsb, buf_left);
 666         }
 667
 668         /* return how far we think the primary buffer can
 669          * advance its underrun detector...*/
 670         if (still_behind) return 0;
 671         if ((mixlen - len) < primary_done) return 0;
 672         slen = ((dsb->primary_mixpos < dsb->dsound->mixpos) ?
 673                 dsb->dsound->buflen : 0) + dsb->primary_mixpos -
 674                 dsb->dsound->mixpos;
 675         if (slen > mixlen) {
 676                 /* the primary_done and still_behind checks above should have worked */
 677                 FIXME("problem with advancement calculation (advlen=%ld > mixlen=%ld)\n", slen, mixlen);
 678                 slen = 0;
 679         }
 680         return slen;
 681 }
 682
 683 static DWORD DSOUND_MixToPrimary(DWORD playpos, DWORD writepos, DWORD mixlen, BOOL recover)
 684 {
 685         INT                     i, len, maxlen = 0;
 686         IDirectSoundBufferImpl  *dsb;
 687
 688         TRACE("(%ld,%ld,%ld)\n", playpos, writepos, mixlen);
 689         for (i = dsound->nrofbuffers - 1; i >= 0; i--) {
 690                 dsb = dsound->buffers[i];
 691
 692                 if (!dsb || !(ICOM_VTBL(dsb)))
 693                         continue;
 694                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 695                         TRACE("Checking %p, mixlen=%ld\n", dsb, mixlen);
 696                         EnterCriticalSection(&(dsb->lock));
 697                         if (dsb->state == STATE_STOPPING) {
 698                                 DSOUND_MixCancel(dsb, writepos, TRUE);
 699                                 dsb->state = STATE_STOPPED;
 700                                 DSOUND_CheckEvent(dsb, 0);
 701                         } else {
 702                                 if ((dsb->state == STATE_STARTING) || recover) {
 703                                         dsb->primary_mixpos = writepos;
 704                                         memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
 705                                         dsb->need_remix = FALSE;
 706                                 }
 707                                 else if (dsb->need_remix) {
 708                                         DSOUND_MixCancel(dsb, writepos, TRUE);
 709                                         memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
 710                                         dsb->need_remix = FALSE;
 711                                 }
 712                                 len = DSOUND_MixOne(dsb, playpos, writepos, mixlen);
 713                                 if (dsb->state == STATE_STARTING)
 714                                         dsb->state = STATE_PLAYING;
 715                                 maxlen = (len > maxlen) ? len : maxlen;
 716                         }
 717                         LeaveCriticalSection(&(dsb->lock));
 718                 }
 719         }
 720
 721         return maxlen;
 722 }
 723
 724 static void DSOUND_MixReset(DWORD writepos)
 725 {
 726         INT                     i;
 727         IDirectSoundBufferImpl  *dsb;
 728         int nfiller;
 729
 730         TRACE("(%ld)\n", writepos);
 731
 732         /* the sound of silence */
 733         nfiller = dsound->wfx.wBitsPerSample == 8 ? 128 : 0;
 734
 735         /* reset all buffer mix positions */
 736         for (i = dsound->nrofbuffers - 1; i >= 0; i--) {
 737                 dsb = dsound->buffers[i];
 738
 739                 if (!dsb || !(ICOM_VTBL(dsb)))
 740                         continue;
 741                 if (dsb->buflen && dsb->state && !dsb->hwbuf) {
 742                         TRACE("Resetting %p\n", dsb);
 743                         EnterCriticalSection(&(dsb->lock));
 744                         if (dsb->state == STATE_STOPPING) {
 745                                 dsb->state = STATE_STOPPED;
 746                         }
 747                         else if (dsb->state == STATE_STARTING) {
 748                                 /* nothing */
 749                         } else {
 750                                 DSOUND_MixCancel(dsb, writepos, FALSE);
 751                                 memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
 752                                 dsb->need_remix = FALSE;
 753                         }
 754                         LeaveCriticalSection(&(dsb->lock));
 755                 }
 756         }
 757
 758         /* wipe out premixed data */
 759         if (dsound->mixpos < writepos) {
 760                 memset(dsound->buffer + writepos, nfiller, dsound->buflen - writepos);
 761                 memset(dsound->buffer, nfiller, dsound->mixpos);
 762         } else {
 763                 memset(dsound->buffer + writepos, nfiller, dsound->mixpos - writepos);
 764         }
 765
 766         /* reset primary mix position */
 767         dsound->mixpos = writepos;
 768 }
 769
 770 static void DSOUND_CheckReset(IDirectSoundImpl *dsound, DWORD writepos)
 771 {
 772         if (dsound->need_remix) {
 773                 DSOUND_MixReset(writepos);
 774                 dsound->need_remix = FALSE;
 775                 /* maximize Half-Life performance */
 776                 dsound->prebuf = ds_snd_queue_min;
 777                 dsound->precount = 0;
 778         } else {
 779                 dsound->precount++;
 780                 if (dsound->precount >= 4) {
 781                         if (dsound->prebuf < ds_snd_queue_max)
 782                                 dsound->prebuf++;
 783                         dsound->precount = 0;
 784                 }
 785         }
 786         TRACE("premix adjust: %d\n", dsound->prebuf);
 787 }
 788
 789 void DSOUND_WaveQueue(IDirectSoundImpl *dsound, DWORD mixq)
 790 {
 791         if (mixq + dsound->pwqueue > ds_hel_queue) mixq = ds_hel_queue - dsound->pwqueue;
 792         TRACE("queueing %ld buffers, starting at %d\n", mixq, dsound->pwwrite);
 793         for (; mixq; mixq--) {
 794                 waveOutWrite(dsound->hwo, dsound->pwave[dsound->pwwrite], sizeof(WAVEHDR));
 795                 dsound->pwwrite++;
 796                 if (dsound->pwwrite >= DS_HEL_FRAGS) dsound->pwwrite = 0;
 797                 dsound->pwqueue++;
 798         }
 799 }
 800
 801 /* #define SYNC_CALLBACK */
 802
 803 void DSOUND_PerformMix(void)
 804 {
 805         int nfiller;
 806         BOOL forced;
 807         HRESULT hres;
 808
 809         RtlAcquireResourceShared(&(dsound->lock), TRUE);
 810
 811         if (!dsound || !dsound->ref) {
 812                 /* seems the dsound object is currently being released */
 813                 RtlReleaseResource(&(dsound->lock));
 814                 return;
 815         }
 816
 817         /* the sound of silence */
 818         nfiller = dsound->wfx.wBitsPerSample == 8 ? 128 : 0;
 819
 820         /* whether the primary is forced to play even without secondary buffers */
 821         forced = ((dsound->state == STATE_PLAYING) || (dsound->state == STATE_STARTING));
 822
 823         TRACE("entering at %ld\n", GetTickCount());
 824         if (dsound->priolevel != DSSCL_WRITEPRIMARY) {
 825                 BOOL paused = ((dsound->state == STATE_STOPPED) || (dsound->state == STATE_STARTING));
 826                 /* FIXME: document variables */
 827                 DWORD playpos, writepos, inq, maxq, frag;
 828                 if (dsound->hwbuf) {
 829                         hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, &writepos);
 830                         if (hres) {
 831                             RtlReleaseResource(&(dsound->lock));
 832                             return;
 833                         }
 834                         /* Well, we *could* do Just-In-Time mixing using the writepos,
 835                          * but that's a little bit ambitious and unnecessary... */
 836                         /* rather add our safety margin to the writepos, if we're playing */
 837                         if (!paused) {
 838                                 writepos += dsound->writelead;
 839                                 while (writepos >= dsound->buflen)
 840                                         writepos -= dsound->buflen;
 841                         } else writepos = playpos;
 842                 }
 843                 else {
 844                         playpos = dsound->pwplay * dsound->fraglen;
 845                         writepos = playpos;
 846                         if (!paused) {
 847                                 writepos += ds_hel_margin * dsound->fraglen;
 848                                 while (writepos >= dsound->buflen)
 849                                         writepos -= dsound->buflen;
 850                         }
 851                 }
 852                 TRACE("primary playpos=%ld, writepos=%ld, clrpos=%ld, mixpos=%ld\n",
 853                       playpos,writepos,dsound->playpos,dsound->mixpos);
 854                 /* wipe out just-played sound data */
 855                 if (playpos < dsound->playpos) {
 856                         memset(dsound->buffer + dsound->playpos, nfiller, dsound->buflen - dsound->playpos);
 857                         memset(dsound->buffer, nfiller, playpos);
 858                 } else {
 859                         memset(dsound->buffer + dsound->playpos, nfiller, playpos - dsound->playpos);
 860                 }
 861                 dsound->playpos = playpos;
 862
 863                 EnterCriticalSection(&(dsound->mixlock));
 864
 865                 /* reset mixing if necessary */
 866                 DSOUND_CheckReset(dsound, writepos);
 867
 868                 /* check how much prebuffering is left */
 869                 inq = dsound->mixpos;
 870                 if (inq < writepos)
 871                         inq += dsound->buflen;
 872                 inq -= writepos;
 873
 874                 /* find the maximum we can prebuffer */
 875                 if (!paused) {
 876                         maxq = playpos;
 877                         if (maxq < writepos)
 878                                 maxq += dsound->buflen;
 879                         maxq -= writepos;
 880                 } else maxq = dsound->buflen;
 881
 882                 /* clip maxq to dsound->prebuf */
 883                 frag = dsound->prebuf * dsound->fraglen;
 884                 if (maxq > frag) maxq = frag;
 885
 886                 /* check for consistency */
 887                 if (inq > maxq) {
 888                         /* the playback position must have passed our last
 889                          * mixed position, i.e. it's an underrun, or we have
 890                          * nothing more to play */
 891                         TRACE("reached end of mixed data (inq=%ld, maxq=%ld)\n", inq, maxq);
 892                         inq = 0;
 893                         /* stop the playback now, to allow buffers to refill */
 894                         if (dsound->state == STATE_PLAYING) {
 895                                 dsound->state = STATE_STARTING;
 896                         }
 897                         else if (dsound->state == STATE_STOPPING) {
 898                                 dsound->state = STATE_STOPPED;
 899                         }
 900                         else {
 901                                 /* how can we have an underrun if we aren't playing? */
 902                                 WARN("unexpected primary state (%ld)\n", dsound->state);
 903                         }
 904 #ifdef SYNC_CALLBACK
 905                         /* DSOUND_callback may need this lock */
 906                         LeaveCriticalSection(&(dsound->mixlock));
 907 #endif
 908                         DSOUND_PrimaryStop(dsound);
 909 #ifdef SYNC_CALLBACK
 910                         EnterCriticalSection(&(dsound->mixlock));
 911 #endif
 912                         if (dsound->hwbuf) {
 913                                 /* the Stop is supposed to reset play position to beginning of buffer */
 914                                 /* unfortunately, OSS is not able to do so, so get current pointer */
 915                                 hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, NULL);
 916                                 if (hres) {
 917                                         LeaveCriticalSection(&(dsound->mixlock));
 918                                         RtlReleaseResource(&(dsound->lock));
 919                                         return;
 920                                 }
 921                         } else {
 922                                 playpos = dsound->pwplay * dsound->fraglen;
 923                         }
 924                         writepos = playpos;
 925                         dsound->playpos = playpos;
 926                         dsound->mixpos = writepos;
 927                         inq = 0;
 928                         maxq = dsound->buflen;
 929                         if (maxq > frag) maxq = frag;
 930                         memset(dsound->buffer, nfiller, dsound->buflen);
 931                         paused = TRUE;
 932                 }
 933
 934                 /* do the mixing */
 935                 frag = DSOUND_MixToPrimary(playpos, writepos, maxq, paused);
 936                 if (forced) frag = maxq - inq;
 937                 dsound->mixpos += frag;
 938                 while (dsound->mixpos >= dsound->buflen)
 939                         dsound->mixpos -= dsound->buflen;
 940
 941                 if (frag) {
 942                         /* buffers have been filled, restart playback */
 943                         if (dsound->state == STATE_STARTING) {
 944                                 dsound->state = STATE_PLAYING;
 945                         }
 946                         else if (dsound->state == STATE_STOPPED) {
 947                                 /* the dsound is supposed to play if there's something to play
 948                                  * even if it is reported as stopped, so don't let this confuse you */
 949                                 dsound->state = STATE_STOPPING;
 950                         }
 951                         LeaveCriticalSection(&(dsound->mixlock));
 952                         if (paused) {
 953                                 DSOUND_PrimaryPlay(dsound);
 954                                 TRACE("starting playback\n");
 955                         }
 956                 }
 957                 else
 958                         LeaveCriticalSection(&(dsound->mixlock));
 959         } else {
 960                 /* in the DSSCL_WRITEPRIMARY mode, the app is totally in charge... */
 961                 if (dsound->state == STATE_STARTING) {
 962                         DSOUND_PrimaryPlay(dsound);
 963                         dsound->state = STATE_PLAYING;
 964                 }
 965                 else if (dsound->state == STATE_STOPPING) {
 966                         DSOUND_PrimaryStop(dsound);
 967                         dsound->state = STATE_STOPPED;
 968                 }
 969         }
 970         TRACE("completed processing at %ld\n", GetTickCount());
 971         RtlReleaseResource(&(dsound->lock));
 972 }
 973
 974 void CALLBACK DSOUND_timer(UINT timerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
 975 {
 976         if (!dsound) {
 977                 ERR("dsound died without killing us?\n");
 978                 timeKillEvent(timerID);
 979                 timeEndPeriod(DS_TIME_RES);
 980                 return;
 981         }
 982
 983         TRACE("entered\n");
 984         DSOUND_PerformMix();
 985 }
 986
 987 void CALLBACK DSOUND_callback(HWAVEOUT hwo, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
 988 {
 989         IDirectSoundImpl* This = (IDirectSoundImpl*)dwUser;
 990         TRACE("entering at %ld, msg=%08x(%s)\n", GetTickCount(), msg,
 991                 msg==MM_WOM_DONE ? "MM_WOM_DONE" : msg==MM_WOM_CLOSE ? "MM_WOM_CLOSE" :
 992                 msg==MM_WOM_OPEN ? "MM_WOM_OPEN" : "UNKNOWN");
 993         if (msg == MM_WOM_DONE) {
 994                 DWORD inq, mixq, fraglen, buflen, pwplay, playpos, mixpos;
 995                 if (This->pwqueue == (DWORD)-1) {
 996                         TRACE("completed due to reset\n");
 997                         return;
 998                 }
 999 /* it could be a bad idea to enter critical section here... if there's lock contention,
1000  * the resulting scheduling delays might obstruct the winmm player thread */
1001 #ifdef SYNC_CALLBACK
1002                 EnterCriticalSection(&(This->mixlock));
1003 #endif
1004                 /* retrieve current values */
1005                 fraglen = dsound->fraglen;
1006                 buflen = dsound->buflen;
1007                 pwplay = dsound->pwplay;
1008                 playpos = pwplay * fraglen;
1009                 mixpos = dsound->mixpos;
1010                 /* check remaining mixed data */
1011                 inq = ((mixpos < playpos) ? buflen : 0) + mixpos - playpos;
1012                 mixq = inq / fraglen;
1013                 if ((inq - (mixq * fraglen)) > 0) mixq++;
1014                 /* complete the playing buffer */
1015                 TRACE("done playing primary pos=%ld\n", playpos);
1016                 pwplay++;
1017                 if (pwplay >= DS_HEL_FRAGS) pwplay = 0;
1018                 /* write new values */
1019                 dsound->pwplay = pwplay;
1020                 dsound->pwqueue--;
1021                 /* queue new buffer if we have data for it */
1022                 if (inq>1) DSOUND_WaveQueue(This, inq-1);
1023 #ifdef SYNC_CALLBACK
1024                 LeaveCriticalSection(&(This->mixlock));
1025 #endif
1026         }
1027         TRACE("completed\n");
1028 }