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Sweden-Number/dlls/dsound/mixer.c

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/* DirectSound
*
* Copyright 1998 Marcus Meissner
* Copyright 1998 Rob Riggs
* Copyright 2000-2002 TransGaming Technologies, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <assert.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <math.h> /* Insomnia - pow() function */
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "winerror.h"
#include "mmsystem.h"
#include "winternl.h"
#include "mmddk.h"
#include "wine/windef16.h"
#include "wine/debug.h"
#include "dsound.h"
#include "dsdriver.h"
#include "dsound_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(dsound);
void DSOUND_RecalcVolPan(PDSVOLUMEPAN volpan)
{
double temp;
/* the AmpFactors are expressed in 16.16 fixed point */
volpan->dwVolAmpFactor = (ULONG) (pow(2.0, volpan->lVolume / 600.0) * 65536);
/* FIXME: dwPan{Left|Right}AmpFactor */
/* FIXME: use calculated vol and pan ampfactors */
temp = (double) (volpan->lVolume - (volpan->lPan > 0 ? volpan->lPan : 0));
volpan->dwTotalLeftAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 65536);
temp = (double) (volpan->lVolume + (volpan->lPan < 0 ? volpan->lPan : 0));
volpan->dwTotalRightAmpFactor = (ULONG) (pow(2.0, temp / 600.0) * 65536);
TRACE("left = %lx, right = %lx\n", volpan->dwTotalLeftAmpFactor, volpan->dwTotalRightAmpFactor);
}
void DSOUND_RecalcFormat(IDirectSoundBufferImpl *dsb)
{
DWORD sw;
sw = dsb->wfx.nChannels * (dsb->wfx.wBitsPerSample / 8);
/* calculate the 10ms write lead */
dsb->writelead = (dsb->freq / 100) * sw;
}
void DSOUND_CheckEvent(IDirectSoundBufferImpl *dsb, int len)
{
int i;
DWORD offset;
LPDSBPOSITIONNOTIFY event;
if (!dsb->notify || dsb->notify->nrofnotifies == 0)
return;
TRACE("(%p) buflen = %ld, playpos = %ld, len = %d\n",
dsb, dsb->buflen, dsb->playpos, len);
for (i = 0; i < dsb->notify->nrofnotifies ; i++) {
event = dsb->notify->notifies + i;
offset = event->dwOffset;
TRACE("checking %d, position %ld, event = %p\n",
i, offset, event->hEventNotify);
/* DSBPN_OFFSETSTOP has to be the last element. So this is */
/* OK. [Inside DirectX, p274] */
/* */
/* This also means we can't sort the entries by offset, */
/* because DSBPN_OFFSETSTOP == -1 */
if (offset == DSBPN_OFFSETSTOP) {
if (dsb->state == STATE_STOPPED) {
SetEvent(event->hEventNotify);
TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
return;
} else
return;
}
if ((dsb->playpos + len) >= dsb->buflen) {
if ((offset < ((dsb->playpos + len) % dsb->buflen)) ||
(offset >= dsb->playpos)) {
TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
SetEvent(event->hEventNotify);
}
} else {
if ((offset >= dsb->playpos) && (offset < (dsb->playpos + len))) {
TRACE("signalled event %p (%d)\n", event->hEventNotify, i);
SetEvent(event->hEventNotify);
}
}
}
}
/* WAV format info can be found at:
*
* http://www.cwi.nl/ftp/audio/AudioFormats.part2
* ftp://ftp.cwi.nl/pub/audio/RIFF-format
*
* Import points to remember:
* 8-bit WAV is unsigned
* 16-bit WAV is signed
*/
/* Use the same formulas as pcmconverter.c */
static inline INT16 cvtU8toS16(BYTE b)
{
return (short)((b+(b << 8))-32768);
}
static inline BYTE cvtS16toU8(INT16 s)
{
return (s >> 8) ^ (unsigned char)0x80;
}
static inline void cp_fields(const IDirectSoundBufferImpl *dsb, BYTE *ibuf, BYTE *obuf )
{
INT fl,fr;
if (dsb->wfx.wBitsPerSample == 8) {
if (dsound->wfx.wBitsPerSample == 8 &&
dsound->wfx.nChannels == dsb->wfx.nChannels) {
/* avoid needless 8->16->8 conversion */
*obuf=*ibuf;
if (dsb->wfx.nChannels==2)
*(obuf+1)=*(ibuf+1);
return;
}
fl = cvtU8toS16(*ibuf);
fr = (dsb->wfx.nChannels==2 ? cvtU8toS16(*(ibuf + 1)) : fl);
} else {
fl = *((INT16 *)ibuf);
fr = (dsb->wfx.nChannels==2 ? *(((INT16 *)ibuf) + 1) : fl);
}
if (dsound->wfx.nChannels == 2) {
if (dsound->wfx.wBitsPerSample == 8) {
*obuf = cvtS16toU8(fl);
*(obuf + 1) = cvtS16toU8(fr);
return;
}
if (dsound->wfx.wBitsPerSample == 16) {
*((INT16 *)obuf) = fl;
*(((INT16 *)obuf) + 1) = fr;
return;
}
}
if (dsound->wfx.nChannels == 1) {
fl = (fl + fr) >> 1;
if (dsound->wfx.wBitsPerSample == 8) {
*obuf = cvtS16toU8(fl);
return;
}
if (dsound->wfx.wBitsPerSample == 16) {
*((INT16 *)obuf) = fl;
return;
}
}
}
/* Now with PerfectPitch (tm) technology */
static INT DSOUND_MixerNorm(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
{
INT i, size, ipos, ilen;
BYTE *ibp, *obp;
INT iAdvance = dsb->wfx.nBlockAlign;
INT oAdvance = dsb->dsound->wfx.nBlockAlign;
ibp = dsb->buffer + dsb->buf_mixpos;
obp = buf;
TRACE("(%p, %p, %p), buf_mixpos=%ld\n", dsb, ibp, obp, dsb->buf_mixpos);
/* Check for the best case */
if ((dsb->freq == dsb->dsound->wfx.nSamplesPerSec) &&
(dsb->wfx.wBitsPerSample == dsb->dsound->wfx.wBitsPerSample) &&
(dsb->wfx.nChannels == dsb->dsound->wfx.nChannels)) {
DWORD bytesleft = dsb->buflen - dsb->buf_mixpos;
TRACE("(%p) Best case\n", dsb);
if (len <= bytesleft )
memcpy(obp, ibp, len);
else { /* wrap */
memcpy(obp, ibp, bytesleft );
memcpy(obp + bytesleft, dsb->buffer, len - bytesleft);
}
return len;
}
/* Check for same sample rate */
if (dsb->freq == dsb->dsound->wfx.nSamplesPerSec) {
TRACE("(%p) Same sample rate %ld = primary %ld\n", dsb,
dsb->freq, dsb->dsound->wfx.nSamplesPerSec);
ilen = 0;
for (i = 0; i < len; i += oAdvance) {
cp_fields(dsb, ibp, obp );
ibp += iAdvance;
ilen += iAdvance;
obp += oAdvance;
if (ibp >= (BYTE *)(dsb->buffer + dsb->buflen))
ibp = dsb->buffer; /* wrap */
}
return (ilen);
}
/* Mix in different sample rates */
/* */
/* New PerfectPitch(tm) Technology (c) 1998 Rob Riggs */
/* Patent Pending :-] */
/* Patent enhancements (c) 2000 Ove K<>ven,
* TransGaming Technologies Inc. */
/* FIXME("(%p) Adjusting frequency: %ld -> %ld (need optimization)\n",
dsb, dsb->freq, dsb->dsound->wfx.nSamplesPerSec); */
size = len / oAdvance;
ilen = 0;
ipos = dsb->buf_mixpos;
for (i = 0; i < size; i++) {
cp_fields(dsb, (dsb->buffer + ipos), obp);
obp += oAdvance;
dsb->freqAcc += dsb->freqAdjust;
if (dsb->freqAcc >= (1<<DSOUND_FREQSHIFT)) {
ULONG adv = (dsb->freqAcc>>DSOUND_FREQSHIFT) * iAdvance;
dsb->freqAcc &= (1<<DSOUND_FREQSHIFT)-1;
ipos += adv; ilen += adv;
while (ipos >= dsb->buflen)
ipos -= dsb->buflen;
}
}
return ilen;
}
static void DSOUND_MixerVol(IDirectSoundBufferImpl *dsb, BYTE *buf, INT len)
{
INT i;
BYTE *bpc = buf;
INT16 *bps = (INT16 *) buf;
TRACE("(%p,%p,%d)\n",dsb,buf,len);
TRACE("left = %lx, right = %lx\n", dsb->cvolpan.dwTotalLeftAmpFactor,
dsb->cvolpan.dwTotalRightAmpFactor);
if ((!(dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) || (dsb->cvolpan.lPan == 0)) &&
(!(dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME) || (dsb->cvolpan.lVolume == 0)) &&
!(dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
return; /* Nothing to do */
/* If we end up with some bozo coder using panning or 3D sound */
/* with a mono primary buffer, it could sound very weird using */
/* this method. Oh well, tough patooties. */
switch (dsb->dsound->wfx.wBitsPerSample) {
case 8:
/* 8-bit WAV is unsigned, but we need to operate */
/* on signed data for this to work properly */
switch (dsb->dsound->wfx.nChannels) {
case 1:
for (i = 0; i < len; i++) {
INT val = *bpc - 128;
val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
*bpc = val + 128;
bpc++;
}
break;
case 2:
for (i = 0; i < len; i+=2) {
INT val = *bpc - 128;
val = (val * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
*bpc++ = val + 128;
val = *bpc - 128;
val = (val * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
*bpc = val + 128;
bpc++;
}
break;
default:
FIXME("doesn't support %d channels\n", dsb->dsound->wfx.nChannels);
break;
}
break;
case 16:
/* 16-bit WAV is signed -- much better */
switch (dsb->dsound->wfx.nChannels) {
case 1:
for (i = 0; i < len; i += 2) {
*bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
bps++;
}
break;
case 2:
for (i = 0; i < len; i += 4) {
*bps = (*bps * dsb->cvolpan.dwTotalLeftAmpFactor) >> 16;
bps++;
*bps = (*bps * dsb->cvolpan.dwTotalRightAmpFactor) >> 16;
bps++;
}
break;
default:
FIXME("doesn't support %d channels\n", dsb->dsound->wfx.nChannels);
break;
}
break;
default:
FIXME("doesn't support %d bit samples\n", dsb->dsound->wfx.wBitsPerSample);
break;
}
}
static void *tmp_buffer;
static size_t tmp_buffer_len = 0;
static void *DSOUND_tmpbuffer(size_t len)
{
if (len>tmp_buffer_len) {
void *new_buffer = realloc(tmp_buffer, len);
if (new_buffer) {
tmp_buffer = new_buffer;
tmp_buffer_len = len;
}
return new_buffer;
}
return tmp_buffer;
}
static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD fraglen)
{
INT i, len, ilen, temp, field, nBlockAlign;
INT advance = dsb->dsound->wfx.wBitsPerSample >> 3;
BYTE *buf, *ibuf, *obuf;
INT16 *ibufs, *obufs;
TRACE("%p,%ld,%ld)\n",dsb,writepos,fraglen);
len = fraglen;
if (!(dsb->playflags & DSBPLAY_LOOPING)) {
temp = MulDiv(dsb->dsound->wfx.nAvgBytesPerSec, dsb->buflen,
dsb->nAvgBytesPerSec) -
MulDiv(dsb->dsound->wfx.nAvgBytesPerSec, dsb->buf_mixpos,
dsb->nAvgBytesPerSec);
len = (len > temp) ? temp : len;
}
nBlockAlign = dsb->dsound->wfx.nBlockAlign;
len = len / nBlockAlign * nBlockAlign; /* data alignment */
if (len == 0) {
/* This should only happen if we aren't looping and temp < nBlockAlign */
return 0;
}
/* Been seeing segfaults in malloc() for some reason... */
TRACE("allocating buffer (size = %d)\n", len);
if ((buf = ibuf = (BYTE *) DSOUND_tmpbuffer(len)) == NULL)
return 0;
TRACE("MixInBuffer (%p) len = %d, dest = %ld\n", dsb, len, writepos);
ilen = DSOUND_MixerNorm(dsb, ibuf, len);
if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
(dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME))
DSOUND_MixerVol(dsb, ibuf, len);
obuf = dsb->dsound->buffer + writepos;
for (i = 0; i < len; i += advance) {
obufs = (INT16 *) obuf;
ibufs = (INT16 *) ibuf;
if (dsb->dsound->wfx.wBitsPerSample == 8) {
/* 8-bit WAV is unsigned */
field = (*ibuf - 128);
field += (*obuf - 128);
field = field > 127 ? 127 : field;
field = field < -128 ? -128 : field;
*obuf = field + 128;
} else {
/* 16-bit WAV is signed */
field = *ibufs;
field += *obufs;
field = field > 32767 ? 32767 : field;
field = field < -32768 ? -32768 : field;
*obufs = field;
}
ibuf += advance;
obuf += advance;
if (obuf >= (BYTE *)(dsb->dsound->buffer + dsb->dsound->buflen))
obuf = dsb->dsound->buffer;
}
/* free(buf); */
if (dsb->leadin && (dsb->startpos > dsb->buf_mixpos) && (dsb->startpos <= dsb->buf_mixpos + ilen)) {
/* HACK... leadin should be reset when the PLAY position reaches the startpos,
* not the MIX position... but if the sound buffer is bigger than our prebuffering
* (which must be the case for the streaming buffers that need this hack anyway)
* plus DS_HEL_MARGIN or equivalent, then this ought to work anyway. */
dsb->leadin = FALSE;
}
dsb->buf_mixpos += ilen;
if (dsb->buf_mixpos >= dsb->buflen) {
if (dsb->playflags & DSBPLAY_LOOPING) {
/* wrap */
while (dsb->buf_mixpos >= dsb->buflen)
dsb->buf_mixpos -= dsb->buflen;
if (dsb->leadin && (dsb->startpos <= dsb->buf_mixpos))
dsb->leadin = FALSE; /* HACK: see above */
}
}
return len;
}
static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWORD len)
{
INT i, ilen, field, nBlockAlign;
INT advance = dsb->dsound->wfx.wBitsPerSample >> 3;
BYTE *buf, *ibuf, *obuf;
INT16 *ibufs, *obufs;
nBlockAlign = dsb->dsound->wfx.nBlockAlign;
len = len / nBlockAlign * nBlockAlign; /* data alignment */
TRACE("allocating buffer (size = %ld)\n", len);
if ((buf = ibuf = (BYTE *) DSOUND_tmpbuffer(len)) == NULL)
return;
TRACE("PhaseCancel (%p) len = %ld, dest = %ld\n", dsb, len, writepos);
ilen = DSOUND_MixerNorm(dsb, ibuf, len);
if ((dsb->dsbd.dwFlags & DSBCAPS_CTRLPAN) ||
(dsb->dsbd.dwFlags & DSBCAPS_CTRLVOLUME))
DSOUND_MixerVol(dsb, ibuf, len);
/* subtract instead of add, to phase out premixed data */
obuf = dsb->dsound->buffer + writepos;
for (i = 0; i < len; i += advance) {
obufs = (INT16 *) obuf;
ibufs = (INT16 *) ibuf;
if (dsb->dsound->wfx.wBitsPerSample == 8) {
/* 8-bit WAV is unsigned */
field = (*ibuf - 128);
field -= (*obuf - 128);
field = field > 127 ? 127 : field;
field = field < -128 ? -128 : field;
*obuf = field + 128;
} else {
/* 16-bit WAV is signed */
field = *ibufs;
field -= *obufs;
field = field > 32767 ? 32767 : field;
field = field < -32768 ? -32768 : field;
*obufs = field;
}
ibuf += advance;
obuf += advance;
if (obuf >= (BYTE *)(dsb->dsound->buffer + dsb->dsound->buflen))
obuf = dsb->dsound->buffer;
}
/* free(buf); */
}
static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)
{
DWORD size, flen, len, npos, nlen;
INT iAdvance = dsb->wfx.nBlockAlign;
INT oAdvance = dsb->dsound->wfx.nBlockAlign;
/* determine amount of premixed data to cancel */
DWORD primary_done =
((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
dsb->primary_mixpos - writepos;
TRACE("(%p, %ld), buf_mixpos=%ld\n", dsb, writepos, dsb->buf_mixpos);
/* backtrack the mix position */
size = primary_done / oAdvance;
flen = size * dsb->freqAdjust;
len = (flen >> DSOUND_FREQSHIFT) * iAdvance;
flen &= (1<<DSOUND_FREQSHIFT)-1;
while (dsb->freqAcc < flen) {
len += iAdvance;
dsb->freqAcc += 1<<DSOUND_FREQSHIFT;
}
len %= dsb->buflen;
npos = ((dsb->buf_mixpos < len) ? dsb->buflen : 0) +
dsb->buf_mixpos - len;
if (dsb->leadin && (dsb->startpos > npos) && (dsb->startpos <= npos + len)) {
/* stop backtracking at startpos */
npos = dsb->startpos;
len = ((dsb->buf_mixpos < npos) ? dsb->buflen : 0) +
dsb->buf_mixpos - npos;
flen = dsb->freqAcc;
nlen = len / dsb->wfx.nBlockAlign;
nlen = ((nlen << DSOUND_FREQSHIFT) + flen) / dsb->freqAdjust;
nlen *= dsb->dsound->wfx.nBlockAlign;
writepos =
((dsb->primary_mixpos < nlen) ? dsb->dsound->buflen : 0) +
dsb->primary_mixpos - nlen;
}
dsb->freqAcc -= flen;
dsb->buf_mixpos = npos;
dsb->primary_mixpos = writepos;
TRACE("new buf_mixpos=%ld, primary_mixpos=%ld (len=%ld)\n",
dsb->buf_mixpos, dsb->primary_mixpos, len);
if (cancel) DSOUND_PhaseCancel(dsb, writepos, len);
}
void DSOUND_MixCancelAt(IDirectSoundBufferImpl *dsb, DWORD buf_writepos)
{
#if 0
DWORD i, size, flen, len, npos, nlen;
INT iAdvance = dsb->wfx.nBlockAlign;
INT oAdvance = dsb->dsound->wfx.nBlockAlign;
/* determine amount of premixed data to cancel */
DWORD buf_done =
((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
dsb->buf_mixpos - buf_writepos;
#endif
WARN("(%p, %ld), buf_mixpos=%ld\n", dsb, buf_writepos, dsb->buf_mixpos);
/* since this is not implemented yet, just cancel *ALL* prebuffering for now
* (which is faster anyway when there's only a single secondary buffer) */
dsb->dsound->need_remix = TRUE;
}
void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
{
EnterCriticalSection(&dsb->lock);
if (dsb->state == STATE_PLAYING) {
#if 0 /* this may not be quite reliable yet */
dsb->need_remix = TRUE;
#else
dsb->dsound->need_remix = TRUE;
#endif
}
LeaveCriticalSection(&dsb->lock);
}
static DWORD DSOUND_MixOne(IDirectSoundBufferImpl *dsb, DWORD playpos, DWORD writepos, DWORD mixlen)
{
DWORD len, slen;
/* determine this buffer's write position */
DWORD buf_writepos = DSOUND_CalcPlayPosition(dsb, dsb->state & dsb->dsound->state, writepos,
writepos, dsb->primary_mixpos, dsb->buf_mixpos);
/* determine how much already-mixed data exists */
DWORD buf_done =
((dsb->buf_mixpos < buf_writepos) ? dsb->buflen : 0) +
dsb->buf_mixpos - buf_writepos;
DWORD primary_done =
((dsb->primary_mixpos < writepos) ? dsb->dsound->buflen : 0) +
dsb->primary_mixpos - writepos;
DWORD adv_done =
((dsb->dsound->mixpos < writepos) ? dsb->dsound->buflen : 0) +
dsb->dsound->mixpos - writepos;
DWORD played =
((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
buf_writepos - dsb->playpos;
DWORD buf_left = dsb->buflen - buf_writepos;
int still_behind;
TRACE("buf_writepos=%ld, primary_writepos=%ld\n", buf_writepos, writepos);
TRACE("buf_done=%ld, primary_done=%ld\n", buf_done, primary_done);
TRACE("buf_mixpos=%ld, primary_mixpos=%ld, mixlen=%ld\n", dsb->buf_mixpos, dsb->primary_mixpos,
mixlen);
TRACE("looping=%ld, startpos=%ld, leadin=%ld\n", dsb->playflags, dsb->startpos, dsb->leadin);
/* check for notification positions */
if (dsb->dsbd.dwFlags & DSBCAPS_CTRLPOSITIONNOTIFY &&
dsb->state != STATE_STARTING) {
DSOUND_CheckEvent(dsb, played);
}
/* save write position for non-GETCURRENTPOSITION2... */
dsb->playpos = buf_writepos;
/* check whether CalcPlayPosition detected a mixing underrun */
if ((buf_done == 0) && (dsb->primary_mixpos != writepos)) {
/* it did, but did we have more to play? */
if ((dsb->playflags & DSBPLAY_LOOPING) ||
(dsb->buf_mixpos < dsb->buflen)) {
/* yes, have to recover */
ERR("underrun on sound buffer %p\n", dsb);
TRACE("recovering from underrun: primary_mixpos=%ld\n", writepos);
}
dsb->primary_mixpos = writepos;
primary_done = 0;
}
/* determine how far ahead we should mix */
if (((dsb->playflags & DSBPLAY_LOOPING) ||
(dsb->leadin && (dsb->probably_valid_to != 0))) &&
!(dsb->dsbd.dwFlags & DSBCAPS_STATIC)) {
/* if this is a streaming buffer, it typically means that
* we should defer mixing past probably_valid_to as long
* as we can, to avoid unnecessary remixing */
/* the heavy-looking calculations shouldn't be that bad,
* as any game isn't likely to be have more than 1 or 2
* streaming buffers in use at any time anyway... */
DWORD probably_valid_left =
(dsb->probably_valid_to == (DWORD)-1) ? dsb->buflen :
((dsb->probably_valid_to < buf_writepos) ? dsb->buflen : 0) +
dsb->probably_valid_to - buf_writepos;
/* check for leadin condition */
if ((probably_valid_left == 0) &&
(dsb->probably_valid_to == dsb->startpos) &&
dsb->leadin)
probably_valid_left = dsb->buflen;
TRACE("streaming buffer probably_valid_to=%ld, probably_valid_left=%ld\n",
dsb->probably_valid_to, probably_valid_left);
/* check whether the app's time is already up */
if (probably_valid_left < dsb->writelead) {
WARN("probably_valid_to now within writelead, possible streaming underrun\n");
/* once we pass the point of no return,
* no reason to hold back anymore */
dsb->probably_valid_to = (DWORD)-1;
/* we just have to go ahead and mix what we have,
* there's no telling what the app is thinking anyway */
} else {
/* adjust for our frequency and our sample size */
probably_valid_left = MulDiv(probably_valid_left,
1 << DSOUND_FREQSHIFT,
dsb->wfx.nBlockAlign * dsb->freqAdjust) *
dsb->dsound->wfx.nBlockAlign;
/* check whether to clip mix_len */
if (probably_valid_left < mixlen) {
TRACE("clipping to probably_valid_left=%ld\n", probably_valid_left);
mixlen = probably_valid_left;
}
}
}
/* cut mixlen with what's already been mixed */
if (mixlen < primary_done) {
/* huh? and still CalcPlayPosition didn't
* detect an underrun? */
FIXME("problem with underrun detection (mixlen=%ld < primary_done=%ld)\n", mixlen, primary_done);
return 0;
}
len = mixlen - primary_done;
TRACE("remaining mixlen=%ld\n", len);
if (len < dsb->dsound->fraglen) {
/* smaller than a fragment, wait until it gets larger
* before we take the mixing overhead */
TRACE("mixlen not worth it, deferring mixing\n");
still_behind = 1;
goto post_mix;
}
/* ok, we know how much to mix, let's go */
still_behind = (adv_done > primary_done);
while (len) {
slen = dsb->dsound->buflen - dsb->primary_mixpos;
if (slen > len) slen = len;
slen = DSOUND_MixInBuffer(dsb, dsb->primary_mixpos, slen);
if ((dsb->primary_mixpos < dsb->dsound->mixpos) &&
(dsb->primary_mixpos + slen >= dsb->dsound->mixpos))
still_behind = FALSE;
dsb->primary_mixpos += slen; len -= slen;
while (dsb->primary_mixpos >= dsb->dsound->buflen)
dsb->primary_mixpos -= dsb->dsound->buflen;
if ((dsb->state == STATE_STOPPED) || !slen) break;
}
TRACE("new primary_mixpos=%ld, primary_advbase=%ld\n", dsb->primary_mixpos, dsb->dsound->mixpos);
TRACE("mixed data len=%ld, still_behind=%d\n", mixlen-len, still_behind);
post_mix:
/* check if buffer should be considered complete */
if (buf_left < dsb->writelead &&
!(dsb->playflags & DSBPLAY_LOOPING)) {
dsb->state = STATE_STOPPED;
dsb->playpos = 0;
dsb->last_playpos = 0;
dsb->buf_mixpos = 0;
dsb->leadin = FALSE;
DSOUND_CheckEvent(dsb, buf_left);
}
/* return how far we think the primary buffer can
* advance its underrun detector...*/
if (still_behind) return 0;
if ((mixlen - len) < primary_done) return 0;
slen = ((dsb->primary_mixpos < dsb->dsound->mixpos) ?
dsb->dsound->buflen : 0) + dsb->primary_mixpos -
dsb->dsound->mixpos;
if (slen > mixlen) {
/* the primary_done and still_behind checks above should have worked */
FIXME("problem with advancement calculation (advlen=%ld > mixlen=%ld)\n", slen, mixlen);
slen = 0;
}
return slen;
}
static DWORD DSOUND_MixToPrimary(DWORD playpos, DWORD writepos, DWORD mixlen, BOOL recover)
{
INT i, len, maxlen = 0;
IDirectSoundBufferImpl *dsb;
TRACE("(%ld,%ld,%ld)\n", playpos, writepos, mixlen);
for (i = dsound->nrofbuffers - 1; i >= 0; i--) {
dsb = dsound->buffers[i];
if (!dsb || !dsb->lpVtbl)
continue;
if (dsb->buflen && dsb->state && !dsb->hwbuf) {
TRACE("Checking %p, mixlen=%ld\n", dsb, mixlen);
EnterCriticalSection(&(dsb->lock));
if (dsb->state == STATE_STOPPING) {
DSOUND_MixCancel(dsb, writepos, TRUE);
dsb->state = STATE_STOPPED;
DSOUND_CheckEvent(dsb, 0);
} else {
if ((dsb->state == STATE_STARTING) || recover) {
dsb->primary_mixpos = writepos;
memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
dsb->need_remix = FALSE;
}
else if (dsb->need_remix) {
DSOUND_MixCancel(dsb, writepos, TRUE);
memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
dsb->need_remix = FALSE;
}
len = DSOUND_MixOne(dsb, playpos, writepos, mixlen);
if (dsb->state == STATE_STARTING)
dsb->state = STATE_PLAYING;
maxlen = (len > maxlen) ? len : maxlen;
}
LeaveCriticalSection(&(dsb->lock));
}
}
return maxlen;
}
static void DSOUND_MixReset(DWORD writepos)
{
INT i;
IDirectSoundBufferImpl *dsb;
int nfiller;
TRACE("(%ld)\n", writepos);
/* the sound of silence */
nfiller = dsound->wfx.wBitsPerSample == 8 ? 128 : 0;
/* reset all buffer mix positions */
for (i = dsound->nrofbuffers - 1; i >= 0; i--) {
dsb = dsound->buffers[i];
if (!dsb || !dsb->lpVtbl)
continue;
if (dsb->buflen && dsb->state && !dsb->hwbuf) {
TRACE("Resetting %p\n", dsb);
EnterCriticalSection(&(dsb->lock));
if (dsb->state == STATE_STOPPING) {
dsb->state = STATE_STOPPED;
}
else if (dsb->state == STATE_STARTING) {
/* nothing */
} else {
DSOUND_MixCancel(dsb, writepos, FALSE);
memcpy(&dsb->cvolpan, &dsb->volpan, sizeof(dsb->cvolpan));
dsb->need_remix = FALSE;
}
LeaveCriticalSection(&(dsb->lock));
}
}
/* wipe out premixed data */
if (dsound->mixpos < writepos) {
memset(dsound->buffer + writepos, nfiller, dsound->buflen - writepos);
memset(dsound->buffer, nfiller, dsound->mixpos);
} else {
memset(dsound->buffer + writepos, nfiller, dsound->mixpos - writepos);
}
/* reset primary mix position */
dsound->mixpos = writepos;
}
static void DSOUND_CheckReset(IDirectSoundImpl *dsound, DWORD writepos)
{
if (dsound->need_remix) {
DSOUND_MixReset(writepos);
dsound->need_remix = FALSE;
/* maximize Half-Life performance */
dsound->prebuf = ds_snd_queue_min;
dsound->precount = 0;
} else {
dsound->precount++;
if (dsound->precount >= 4) {
if (dsound->prebuf < ds_snd_queue_max)
dsound->prebuf++;
dsound->precount = 0;
}
}
TRACE("premix adjust: %d\n", dsound->prebuf);
}
void DSOUND_WaveQueue(IDirectSoundImpl *dsound, DWORD mixq)
{
if (mixq + dsound->pwqueue > ds_hel_queue) mixq = ds_hel_queue - dsound->pwqueue;
TRACE("queueing %ld buffers, starting at %d\n", mixq, dsound->pwwrite);
for (; mixq; mixq--) {
waveOutWrite(dsound->hwo, dsound->pwave[dsound->pwwrite], sizeof(WAVEHDR));
dsound->pwwrite++;
if (dsound->pwwrite >= DS_HEL_FRAGS) dsound->pwwrite = 0;
dsound->pwqueue++;
}
}
/* #define SYNC_CALLBACK */
void DSOUND_PerformMix(void)
{
int nfiller;
BOOL forced;
HRESULT hres;
TRACE("()\n");
RtlAcquireResourceShared(&(dsound->lock), TRUE);
if (!dsound || !dsound->ref) {
/* seems the dsound object is currently being released */
RtlReleaseResource(&(dsound->lock));
return;
}
/* the sound of silence */
nfiller = dsound->wfx.wBitsPerSample == 8 ? 128 : 0;
/* whether the primary is forced to play even without secondary buffers */
forced = ((dsound->state == STATE_PLAYING) || (dsound->state == STATE_STARTING));
TRACE("entering at %ld\n", GetTickCount());
if (dsound->priolevel != DSSCL_WRITEPRIMARY) {
BOOL paused = ((dsound->state == STATE_STOPPED) || (dsound->state == STATE_STARTING));
/* FIXME: document variables */
DWORD playpos, writepos, inq, maxq, frag;
if (dsound->hwbuf) {
hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, &writepos);
if (hres) {
RtlReleaseResource(&(dsound->lock));
return;
}
/* Well, we *could* do Just-In-Time mixing using the writepos,
* but that's a little bit ambitious and unnecessary... */
/* rather add our safety margin to the writepos, if we're playing */
if (!paused) {
writepos += dsound->writelead;
while (writepos >= dsound->buflen)
writepos -= dsound->buflen;
} else writepos = playpos;
}
else {
playpos = dsound->pwplay * dsound->fraglen;
writepos = playpos;
if (!paused) {
writepos += ds_hel_margin * dsound->fraglen;
while (writepos >= dsound->buflen)
writepos -= dsound->buflen;
}
}
TRACE("primary playpos=%ld, writepos=%ld, clrpos=%ld, mixpos=%ld\n",
playpos,writepos,dsound->playpos,dsound->mixpos);
/* wipe out just-played sound data */
if (playpos < dsound->playpos) {
memset(dsound->buffer + dsound->playpos, nfiller, dsound->buflen - dsound->playpos);
memset(dsound->buffer, nfiller, playpos);
} else {
memset(dsound->buffer + dsound->playpos, nfiller, playpos - dsound->playpos);
}
dsound->playpos = playpos;
EnterCriticalSection(&(dsound->mixlock));
/* reset mixing if necessary */
DSOUND_CheckReset(dsound, writepos);
/* check how much prebuffering is left */
inq = dsound->mixpos;
if (inq < writepos)
inq += dsound->buflen;
inq -= writepos;
/* find the maximum we can prebuffer */
if (!paused) {
maxq = playpos;
if (maxq < writepos)
maxq += dsound->buflen;
maxq -= writepos;
} else maxq = dsound->buflen;
/* clip maxq to dsound->prebuf */
frag = dsound->prebuf * dsound->fraglen;
if (maxq > frag) maxq = frag;
/* check for consistency */
if (inq > maxq) {
/* the playback position must have passed our last
* mixed position, i.e. it's an underrun, or we have
* nothing more to play */
TRACE("reached end of mixed data (inq=%ld, maxq=%ld)\n", inq, maxq);
inq = 0;
/* stop the playback now, to allow buffers to refill */
if (dsound->state == STATE_PLAYING) {
dsound->state = STATE_STARTING;
}
else if (dsound->state == STATE_STOPPING) {
dsound->state = STATE_STOPPED;
}
else {
/* how can we have an underrun if we aren't playing? */
WARN("unexpected primary state (%ld)\n", dsound->state);
}
#ifdef SYNC_CALLBACK
/* DSOUND_callback may need this lock */
LeaveCriticalSection(&(dsound->mixlock));
#endif
DSOUND_PrimaryStop(dsound);
#ifdef SYNC_CALLBACK
EnterCriticalSection(&(dsound->mixlock));
#endif
if (dsound->hwbuf) {
/* the Stop is supposed to reset play position to beginning of buffer */
/* unfortunately, OSS is not able to do so, so get current pointer */
hres = IDsDriverBuffer_GetPosition(dsound->hwbuf, &playpos, NULL);
if (hres) {
LeaveCriticalSection(&(dsound->mixlock));
RtlReleaseResource(&(dsound->lock));
return;
}
} else {
playpos = dsound->pwplay * dsound->fraglen;
}
writepos = playpos;
dsound->playpos = playpos;
dsound->mixpos = writepos;
inq = 0;
maxq = dsound->buflen;
if (maxq > frag) maxq = frag;
memset(dsound->buffer, nfiller, dsound->buflen);
paused = TRUE;
}
/* do the mixing */
frag = DSOUND_MixToPrimary(playpos, writepos, maxq, paused);
if (forced) frag = maxq - inq;
dsound->mixpos += frag;
while (dsound->mixpos >= dsound->buflen)
dsound->mixpos -= dsound->buflen;
if (frag) {
/* buffers have been filled, restart playback */
if (dsound->state == STATE_STARTING) {
dsound->state = STATE_PLAYING;
}
else if (dsound->state == STATE_STOPPED) {
/* the dsound is supposed to play if there's something to play
* even if it is reported as stopped, so don't let this confuse you */
dsound->state = STATE_STOPPING;
}
LeaveCriticalSection(&(dsound->mixlock));
if (paused) {
DSOUND_PrimaryPlay(dsound);
TRACE("starting playback\n");
}
}
else
LeaveCriticalSection(&(dsound->mixlock));
} else {
/* in the DSSCL_WRITEPRIMARY mode, the app is totally in charge... */
if (dsound->state == STATE_STARTING) {
DSOUND_PrimaryPlay(dsound);
dsound->state = STATE_PLAYING;
}
else if (dsound->state == STATE_STOPPING) {
DSOUND_PrimaryStop(dsound);
dsound->state = STATE_STOPPED;
}
}
TRACE("completed processing at %ld\n", GetTickCount());
RtlReleaseResource(&(dsound->lock));
}
void CALLBACK DSOUND_timer(UINT timerID, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
{
if (!dsound) {
ERR("dsound died without killing us?\n");
timeKillEvent(timerID);
timeEndPeriod(DS_TIME_RES);
return;
}
TRACE("entered\n");
DSOUND_PerformMix();
}
void CALLBACK DSOUND_callback(HWAVEOUT hwo, UINT msg, DWORD dwUser, DWORD dw1, DWORD dw2)
{
IDirectSoundImpl* This = (IDirectSoundImpl*)dwUser;
TRACE("entering at %ld, msg=%08x(%s)\n", GetTickCount(), msg,
msg==MM_WOM_DONE ? "MM_WOM_DONE" : msg==MM_WOM_CLOSE ? "MM_WOM_CLOSE" :
msg==MM_WOM_OPEN ? "MM_WOM_OPEN" : "UNKNOWN");
if (msg == MM_WOM_DONE) {
DWORD inq, mixq, fraglen, buflen, pwplay, playpos, mixpos;
if (This->pwqueue == (DWORD)-1) {
TRACE("completed due to reset\n");
return;
}
/* it could be a bad idea to enter critical section here... if there's lock contention,
* the resulting scheduling delays might obstruct the winmm player thread */
#ifdef SYNC_CALLBACK
EnterCriticalSection(&(This->mixlock));
#endif
/* retrieve current values */
fraglen = dsound->fraglen;
buflen = dsound->buflen;
pwplay = dsound->pwplay;
playpos = pwplay * fraglen;
mixpos = dsound->mixpos;
/* check remaining mixed data */
inq = ((mixpos < playpos) ? buflen : 0) + mixpos - playpos;
mixq = inq / fraglen;
if ((inq - (mixq * fraglen)) > 0) mixq++;
/* complete the playing buffer */
TRACE("done playing primary pos=%ld\n", playpos);
pwplay++;
if (pwplay >= DS_HEL_FRAGS) pwplay = 0;
/* write new values */
dsound->pwplay = pwplay;
dsound->pwqueue--;
/* queue new buffer if we have data for it */
if (inq>1) DSOUND_WaveQueue(This, inq-1);
#ifdef SYNC_CALLBACK
LeaveCriticalSection(&(This->mixlock));
#endif
}
TRACE("completed\n");
}
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