kAudioUnitErr_InvalidElement on component open
kAudioUnitErr_InvalidElement on component open
- Subject: kAudioUnitErr_InvalidElement on component open
- From: Marc Poirier <email@hidden>
- Date: Mon, 30 Sep 2002 15:43:28 -0400
Hi. I'm having major problems with the Audio Unit that I'm currently
working on and I'm having trouble narrowing down exactly where the
problems occur. When I run FindUnits (which I modified to just look
for this AU), the following (shortened) code:
AUComponent comp = AUComponent.findAU (auDesc);
AudioUnit theUnit = null;
try {
theUnit = comp.open();
System.out.println (theUnit + "\n");
ParameterValidation.validate (theUnit);
} catch (CAException e) {
System.out.println (kErrorTagStr + e + "\n");
}
catches an exception and outputs:
# #
#com.apple.audio.CAException[JCoreAudio:1.2.111],-10877=kAudioUnitErr_InvalidElement
So somewhere the open process is returning an InvalidElement error.
I filled my AU's entry point with printfs and see that the entry
point gets called twice: once with the kComponentOpenSelect selector
and then with a kComponentCloseSelect selector. The unusual thing is
that, in both cases, the address that is passed in by the obj pointer
(the Class* argument in the entry point) is 0. This makes sense for
opening, but not for closing (and my functioning Audio Units get
non-zero addresses for obj passed to them during close), so I'm
guessing that the problem is occuring during ComponentOpen and a
valid instance can't even be created, hence the null pointer on
close. Please correct me if I'm off-base here, though.
So my question is: what happens when my entry point dispatches the
open selector? Where do I look for the problematic code? From what
I can tell, it looks like the Audio Unit constructor and
PostConstructor (which I didn't write, so it will be AUBase's default
CreateElements(); I think?) are called, but I don't see where an
error gets returned. Anyway, I hope this isn't a dumb question, I
have spent hours now looking through docs and headers trying to trace
what occurs during the open selector dispatch, but I am not able to
figure this out, so any help or pointers would be greatly appreciated.
Thanks,
Marc
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