21 Mar
2012
21 Mar
'12
2:53 p.m.
On 03/21/2012 02:32 PM, Fons Adriaensen wrote:
Hello,
Does anyone know what sort of timer is used by the ALSA
loop device, and if this can be changed in some way ?
It uses the software clock (jiffies). It also has separate timers for
playback and capture and AFAICT it can not be changed.
Maybe you should ask on the alsa-dev list or read for yourself:
http://git.alsa-project.org/?p=alsa-kernel.git;a=blob;f=sound/drivers/aloop…
On the system I'm working on now, wakeup times
while waiting
for a period to be available (as done by Jack and zita-alsa-pcmi)
seem to be quantised in steps of 3.3ms or so. Which means it
sometimes wakes up 3/4 or more of a period too late. Next one
will be xrun in that case.
Ciao,