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dsound: Use an inline for ring buffer pointer difference calculation.

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This commit is contained in:
Maarten Lankhorst 2007-02-21 20:17:22 +01:00 committed by Alexandre Julliard
parent 0036298a14
commit c38bcb96d7
1 changed files with 27 additions and 27 deletions
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54
dlls/dsound/mixer.c
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@ -723,6 +723,19 @@ void DSOUND_ForceRemix(IDirectSoundBufferImpl *dsb)
LeaveCriticalSection(&dsb->lock);
}
/**
* Calculate the distance between two buffer offsets, taking wraparound
* into account.
*/
static inline DWORD DSOUND_BufPtrDiff(DWORD buflen, DWORD ptr1, DWORD ptr2)
{
if (ptr1 >= ptr2) {
return ptr1 - ptr2;
} else {
return buflen + ptr1 - ptr2;
}
}
/**
* Mix some frames from the given secondary buffer "dsb" into the device
* primary buffer.
@ -744,18 +757,10 @@ static DWORD DSOUND_MixOne(IDirectSoundBufferImpl *dsb, DWORD playpos, DWORD wri
/* determine this buffer's write position */
DWORD buf_writepos = DSOUND_CalcPlayPosition(dsb, writepos, writepos);
/* 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->device->buflen : 0) +
dsb->primary_mixpos - writepos;
DWORD adv_done =
((dsb->device->mixpos < writepos) ? dsb->device->buflen : 0) +
dsb->device->mixpos - writepos;
DWORD played =
((buf_writepos < dsb->playpos) ? dsb->buflen : 0) +
buf_writepos - dsb->playpos;
DWORD buf_done = DSOUND_BufPtrDiff(dsb->buflen, dsb->buf_mixpos, buf_writepos);
DWORD primary_done = DSOUND_BufPtrDiff(dsb->device->buflen, dsb->primary_mixpos, writepos);
DWORD adv_done = DSOUND_BufPtrDiff(dsb->device->buflen, dsb->device->mixpos, writepos);
DWORD played = DSOUND_BufPtrDiff(dsb->buflen, buf_writepos, dsb->playpos);
DWORD buf_left = dsb->buflen - buf_writepos;
int still_behind;
@ -883,9 +888,7 @@ post_mix:
* advance its underrun detector...*/
if (still_behind) return 0;
if ((mixlen - len) < primary_done) return 0;
slen = ((dsb->primary_mixpos < dsb->device->mixpos) ?
dsb->device->buflen : 0) + dsb->primary_mixpos -
dsb->device->mixpos;
slen = DSOUND_BufPtrDiff(dsb->device->buflen, dsb->primary_mixpos, dsb->device->mixpos);
if (slen > mixlen) {
/* the primary_done and still_behind checks above should have worked */
FIXME("problem with advancement calculation (advlen=%d > mixlen=%d)\n", slen, mixlen);
@ -1087,22 +1090,19 @@ static void DSOUND_PerformMix(DirectSoundDevice *device)
DSOUND_CheckReset(device, writepos);
/* check how much prebuffering is left */
inq = device->mixpos;
if (inq < writepos)
inq += device->buflen;
inq -= writepos;
inq = DSOUND_BufPtrDiff(device->buflen, device->mixpos, writepos);
/* find the maximum we can prebuffer */
if (!paused) {
maxq = playpos;
if (maxq < writepos)
maxq += device->buflen;
maxq -= writepos;
} else maxq = device->buflen;
if (!paused)
maxq = DSOUND_BufPtrDiff(device->buflen, playpos, writepos);
/* If we get the whole buffer, difference is 0, so we need to set whole buffer then */
if (paused || !maxq)
maxq = device->buflen;
/* clip maxq to device->prebuf */
frag = device->prebuf * device->fraglen;
if (maxq > frag) maxq = frag;
if (maxq > frag)
maxq = frag;
/* check for consistency */
if (inq > maxq) {
@ -1248,7 +1248,7 @@ void CALLBACK DSOUND_callback(HWAVEOUT hwo, UINT msg, DWORD dwUser, DWORD dw1, D
playpos = pwplay * fraglen;
mixpos = device->mixpos;
/* check remaining mixed data */
inq = ((mixpos < playpos) ? buflen : 0) + mixpos - playpos;
inq = DSOUND_BufPtrDiff(buflen, mixpos, playpos);
mixq = inq / fraglen;
if ((inq - (mixq * fraglen)) > 0) mixq++;
/* complete the playing buffer */