Re: Jamin issue?

On Thu, Nov 17, 2005 at 04:14:17PM -0500, Jesse Chappell wrote:
> On 11/17/05, Sampo Savolainen <[email protected]> wrote:
> > Hi
> >
> > Today I finished a mix and mastered the session with Jamin. Jamin was
> > used as an insert in ardours' master bus.
> >
> > After exporting I noticed that there was a strange anomaly in the
> > exported audio. I restarted ardour & jamin and started investigating. It
> > seems that about 10-20% of the time the anomaly happened and the rest of
> > the time it sounded fine.
> 
> Sampo told me on IRC the periodsize he used was 128 here.

OK, thats probably the problem, Jamin has to use a worker thread when the
period size is below 256 samples (IIRC), if theres a lot of RT pressure
then it will miss deadlines. I guess we could add a option to bypass the
thread, but its liklt to cause xruns.
 
> I've been meaning to post here because I believe Jamin is broken when
> freewheeling using the separate DSP thread mode of operation.   I
> haven't scoured the code yet, but other people have run into the issue
> during ardour exports through Jamin.  The glitches don't occur at
> large period sizes when jamin does the DSP in the audio thread.
> 
> JACK freewheeling state is a special case which clients should
> recognize and alter their behavior if necessary.  Of course most
> clients don't need to, but tricky ones like jamin just might.

Yes, I guess jamin's 2nd thread doesn't get to run.

- Steve


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