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Speed up mixing and unmixing by moving sample size and buffer wrap 

tests to outside the loop.  The code is not as compact or pretty but
it should be faster.
This commit is contained in:
Robert Reif 2004-08-12 20:01:32 +00:00 committed by Alexandre Julliard
parent 0467ce9fd7
commit 101599e902
1 changed files with 125 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

175
dlls/dsound/mixer.c
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@ -387,10 +387,8 @@ static void *DSOUND_tmpbuffer(size_t len)
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;
INT i, len, ilen, temp, field, nBlockAlign, todo;
BYTE *buf, *ibuf;
TRACE("(%p,%ld,%ld)\n",dsb,writepos,fraglen);
@ -423,31 +421,70 @@ static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWO
(dsb->dsbd.dwFlags & DSBCAPS_CTRL3D))
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) {
if (dsb->dsound->wfx.wBitsPerSample == 8) {
BYTE *obuf = dsb->dsound->buffer + writepos;
if ((writepos + len) <= dsb->dsound->buflen)
todo = len;
else
todo = dsb->dsound->buflen - writepos;
for (i = 0; i < todo; i++) {
/* 8-bit WAV is unsigned */
field = (*ibuf - 128);
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;
if (field > 127) field = 127;
else if (field < -128) field = -128;
*obuf++ = field + 128;
}
ibuf += advance;
obuf += advance;
if (obuf >= (BYTE *)(dsb->dsound->buffer + dsb->dsound->buflen))
if (todo < len) {
todo = len - todo;
obuf = dsb->dsound->buffer;
}
/* free(buf); */
for (i = 0; i < todo; i++) {
/* 8-bit WAV is unsigned */
field = (*ibuf++ - 128);
field += (*obuf - 128);
if (field > 127) field = 127;
else if (field < -128) field = -128;
*obuf++ = field + 128;
}
}
} else {
INT16 *ibufs, *obufs;
ibufs = (INT16 *) ibuf;
obufs = (INT16 *)(dsb->dsound->buffer + writepos);
if ((writepos + len) <= dsb->dsound->buflen)
todo = len / 2;
else
todo = (dsb->dsound->buflen - writepos) / 2;
for (i = 0; i < todo; i++) {
/* 16-bit WAV is signed */
field = *ibufs++;
field += *obufs;
if (field > 32767) field = 32767;
else if (field < -32768) field = -32768;
*obufs++ = field;
}
if (todo < (len / 2)) {
todo = (len / 2) - todo;
obufs = (INT16 *)dsb->dsound->buffer;
for (i = 0; i < todo; i++) {
/* 16-bit WAV is signed */
field = *ibufs++;
field += *obufs;
if (field > 32767) field = 32767;
else if (field < -32768) field = -32768;
*obufs++ = field;
}
}
}
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,
@ -474,10 +511,9 @@ static DWORD DSOUND_MixInBuffer(IDirectSoundBufferImpl *dsb, DWORD writepos, DWO
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;
INT i, ilen, field, nBlockAlign, todo;
BYTE *buf, *ibuf;
TRACE("(%p,%ld,%ld)\n",dsb,writepos,len);
nBlockAlign = dsb->dsound->wfx.nBlockAlign;
@ -496,31 +532,70 @@ static void DSOUND_PhaseCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, DWOR
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) {
if (dsb->dsound->wfx.wBitsPerSample == 8) {
BYTE *obuf = dsb->dsound->buffer + writepos;
if ((writepos + len) <= dsb->dsound->buflen)
todo = len;
else
todo = dsb->dsound->buflen - writepos;
for (i = 0; i < todo; i++) {
/* 8-bit WAV is unsigned */
field = (*ibuf - 128);
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;
if (field > 127) field = 127;
else if (field < -128) field = -128;
*obuf++ = field + 128;
}
ibuf += advance;
obuf += advance;
if (obuf >= (BYTE *)(dsb->dsound->buffer + dsb->dsound->buflen))
if (todo < len) {
todo = len - todo;
obuf = dsb->dsound->buffer;
}
/* free(buf); */
for (i = 0; i < todo; i++) {
/* 8-bit WAV is unsigned */
field = (*ibuf++ - 128);
field -= (*obuf - 128);
if (field > 127) field = 127;
else if (field < -128) field = -128;
*obuf++ = field + 128;
}
}
} else {
INT16 *ibufs, *obufs;
ibufs = (INT16 *) ibuf;
obufs = (INT16 *)(dsb->dsound->buffer + writepos);
if ((writepos + len) <= dsb->dsound->buflen)
todo = len / 2;
else
todo = (dsb->dsound->buflen - writepos) / 2;
for (i = 0; i < todo; i++) {
/* 16-bit WAV is signed */
field = *ibufs++;
field -= *obufs;
if (field > 32767) field = 32767;
else if (field < -32768) field = -32768;
*obufs++ = field;
}
if (todo < (len / 2)) {
todo = (len / 2) - todo;
obufs = (INT16 *)dsb->dsound->buffer;
for (i = 0; i < todo; i++) {
/* 16-bit WAV is signed */
field = *ibufs++;
field -= *obufs;
if (field > 32767) field = 32767;
else if (field < -32768) field = -32768;
*obufs++ = field;
}
}
}
}
static void DSOUND_MixCancel(IDirectSoundBufferImpl *dsb, DWORD writepos, BOOL cancel)