6 Nov
2011
6 Nov
'11
8:31 p.m.
The only difference non-jack would make is you need
some function to
tell you roughly what audio time it is you can call from another thread.
Does one use the system clock for that? Is it accurate enough?
Depends on the
system clock used, I presume.
For best accuracy, you have to configure your kernel to support HPET
(high precision event) timers
and make ALSA use it as default. to "link" the audio clock and the system
clock. this enables you to
answer the question "if its time T on clock1, what time is it on
clock2?"
fons wrote the canonical paper on this for a Linux Audio conference a
few years ago, and JACK contains a DLL for this purpose
(jack_get_microseconds() will return a prediction of the current time
according to the audio clock, based on the system clock and the DLL.
thanks, it's sounding increasing like I should be using jack for the time
being.
Iain