2 May
2003
2 May
'03
9:43 a.m.
On Fri, May 02, 2003 at 10:51:27AM +0200, Alexander
Lenhardt wrote:
<ObJack>
if you use the JACK Audio Connection Kit (http://jackit.sf.net/) you
won't have to worry about any of this stuff. you just write the code
to generate chunks of audio, and JACK takes care of just about
everything else. in addition, if you simple software synth mutates
into something more interesting, it will then be able to route audio to the
many other applications that use JACK.
</ObJack>
I'm trying to write very simple software
synthesizer under Linux just for my
own educational purpose.
but one problem i came over is the following:
I made the audio thread shced_fifo with max priority. My GUI thread is
sched_other. To allow the GUI to rerspond, I thought i could just put the
audio thread to sleep for the playing length of the buffer (7ms).
There's something fundamentally wrong here. Normally, the audio thread
synchronises with the audio (ALSA) driver. It will be waiting most of the
time, giving other threads a chance to run, and the problem you describe
then does not exist. This is really the first thing you should get right.