Indexed Audio Unit Parameter
Indexed Audio Unit Parameter
- Subject: Indexed Audio Unit Parameter
- From: Chad Wagner <email@hidden>
- Date: Sun, 13 Apr 2008 02:42:21 -0400
I'm having a problem with audio unit parameters whose "unit" is set
to kAudioUnitParameterUnit_Indexed. Everything works when the
indexed values start at 0 and I provide an array of value strings.
But one of my indexed parameters has no value strings, which causes a
bus error in auval, and another indexed parameter starts at 1 rather
than 0, but auval seems to be looking for an extra value string as if
they started at 0 (i.e. my range is 1 to 3, I provide an array with 3
strings, but auval is looking for a 4th). In all cases, changing the
unit to generic makes the problem go away, as does leaving it as
indexed but starting at 0 and providing an array of value strings...
e.g. one of the parameters is a MIDI channel, which should be an
integer from 1 to 16. I don't want it to start at 0, and it seems
absurd to have to specify an array of strings "1" to "16". Is there
a better way?
Am I misunderstanding the usage of kAudioUnitParameterUnit_Indexed?
Is it required that the minimum value always be zero? Is it required
that I always provide an array of value strings? Or is there
something else I may be doing wrong?
FWIW, Xcode 2.4.1 on OS X 10.4.11, ppc powerbook...
thanks,
cw
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