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dsound: Give rougher estimates for fraglen to satisfy alsa.

This commit is contained in:
Maarten Lankhorst 2007-06-08 13:57:51 +02:00 committed by Alexandre Julliard
parent 65b40f7f7f
commit 9591246002
1 changed files with 14 additions and 2 deletions
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16
dlls/dsound/primary.c
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@ -44,8 +44,20 @@ static void DSOUND_RecalcPrimary(DirectSoundDevice *device)
nBlockAlign = device->pwfx->nBlockAlign;
if (device->hwbuf) {
DWORD fraglen;
/* let fragment size approximate the timer delay */
fraglen = (device->pwfx->nSamplesPerSec * DS_TIME_DEL / 1000) * nBlockAlign;
/* Alsa doesn't have continuous buffers, instead it has buffers with power of 2,
* If DS_TIME_DEL is about 10 ms, 512 * nBlockAlign is roughly correct */
fraglen = 512 * nBlockAlign;
/* Compensate for only being rougly accurate */
if (device->pwfx->nSamplesPerSec <= 26000)
fraglen /= 2;
if (device->pwfx->nSamplesPerSec <= 12000)
fraglen /= 2;
if (device->pwfx->nSamplesPerSec >= 80000)
fraglen *= 2;
/* reduce fragment size until an integer number of them fits in the buffer */
/* (FIXME: this may or may not be a good idea) */
while (device->buflen % fraglen) fraglen -= nBlockAlign;