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Re: AU hosting: automation, presets and GUI updating


On Nov 4, 2009, at 12:31 PM, Paul Davis wrote:

On Wed, Nov 4, 2009 at 3:08 PM, William Stewart <email@hidden> wrote:
There are two things that the host needs to do that I think you aren't
doing. 

thanks a lot.

(1) AudioUnitSetParameter is not sufficient when you change the value of a
parameter with views around. 

actually, i am using the apple utility library's
CAAudioUnit::SetParameter method, and just noted what it does
internally. it appears to ask the plugin if it has a "fast dispatch"
method for setting parameters, and uses it; otherwise it just calls
AudioUnitSetParameter(). could it be that this changed since Tiger, or
was it never doing the right thing?

It doesn't do the utility stuff - in your reply you deleted the sentence that tells you what you need to do (I find this quite frustrating). Here it is again:

>>>
views around. You should look through <AudioToolbox/ AudioUnitUtilities.h> - there are two alternatives there:
- AUParameterSet (which both calls AudioUnitSetParameter for you, and does the AUEvent listener notify)
- Call AudioUnitSetParameter, then AUEventListenerNotify
>>>

Bill


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References: 
 >AU hosting: automation, presets and GUI updating (From: Paul Davis <email@hidden>)
 >Re: AU hosting: automation, presets and GUI updating (From: Olivier Tristan <email@hidden>)
 >Re: AU hosting: automation, presets and GUI updating (From: Paul Davis <email@hidden>)
 >Re: AU hosting: automation, presets and GUI updating (From: William Stewart <email@hidden>)
 >Re: AU hosting: automation, presets and GUI updating (From: Paul Davis <email@hidden>)



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