[Clam-devel] Ladspa+Clam problem

Pau Arumí pau.arumi at barcelonamedia.org
Mon Oct 12 08:56:58 PDT 2009

El dl 12 de 10 de 2009 a les 15:16 +0200, en/na Eugenio Rustico va
> 2009/10/12 Pau Arumí <pau.arumi at barcelonamedia.org>:
> > Hi Eugenio,
> > my guess is that clam's jack backend is not working with 128
> > frames/period (and should be fixed). Can you confirm this by trying
> > jackd at 512?
> I tried 32 to 1024 frames/period, with several different
> periods/buffer and sample rates, and got the same problem. I'm going
> to test if the problem occurs also by using clam library from c++
> code, or only in NetworkEditor.

Yes I can reproduce the problem here! Inserting the Dj Eq (by Steve
Harris) in clam NE produces a nasty dirty sound (specially on extreme
filter levels) while the same ladspa sounds fine in other hosts like

And actually I've checked that other ladspas such as Sine Oscillator
also misbehaves in NE.

It looks like a problem in the ladspa wrapper or in the
port/audio-stream implementation. I'll try to have a look at it this
week. Any help on debugging this will be appreciated.

As a side note, clam devs at barcelona-media are working on new schema
for audio passing through ports (passing and reusing audio buffers)
which will make clam more efficient.
However this fix should not wait for the new design.


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