Re: AULab set properties before initializing
Re: AULab set properties before initializing
- Subject: Re: AULab set properties before initializing
- From: William Stewart <email@hidden>
- Date: Thu, 16 Mar 2006 10:28:59 -0800
On 16/03/2006, at 9:01 AM, Daniel Jalkut wrote:
In debugging my AudioUnit, I've used AULab quite a bit. I notice
something unusual and wanted to get some feedback about whether my
concerns are off-base or not.
When I open a document in AULab where my instrument has previously
been saved in a track, I notice that AULab sends me a
"kAudioUnitSetPropertySelect" (specifically to restore a preset)
before it sends me a kAudioUnitInitializeSelect. Instinctively this
seems like a bug in AULab, but I wonder if this is something I need
to be prepared for in general?
No. There is no requirement that this occurs in any order. The
implementation for state preservation in AUBase is completely
independent of whether the AU is initialised or not. And, auval will
actually test this case as well.
Right now I rely on structures being in place that are not created
until my unit is initialized. If this kind of thing is widespread I
figure I'll have to queue the property settings until I'm
initialized, or else prematurely self-initialize when I get such a
property setting.
You could queue this - just call CFRetain on the incoming aupreset
dictionary and keep it around. You would need to make sure that NONE
of your parameter values can be set before you can be initialised
(because the preset would overide them of course). If param values
can be set, then you probably should initialise the structures that
you need too apply the preset.
Bill
Thoughts? Much appreciated!
Daniel
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