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Re: Quick question on configuring an AU for a certain channel config
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Re: Quick question on configuring an AU for a certain channel config


On Dec 19, 2007, at 5:04 AM, tahome izwah wrote:

Thanks to Bill and Sophia I got the sidechain working. I am left with
one minor thing that I can't seem to figure out:

When I set up my plug in in Logic and choose an audio track as
sidechain everything works as expected. However, Logic always reports
that the sidechain is available, no matter if there's actually an
audio track routed to it or not...

So how am I supposed to figure out if the plug in should actually
*use* the sidechain or not? HasInput() and GetInput() are always valid
and I am getting ABLs through the sidechain when I pull the input, so
I guess there must be another way to determine if I am getting actual
audio track data through the sidechain or not...

That sounds like a bug in Logic? If your AU's input is not connected or in use, then the HasInput returns true:

(You can see this from AUBase):
bool HasInput( AudioUnitElement inElement) {
AUInputElement *in = static_cast<AUInputElement *>(Inputs().GetElement(inElement));
return in != NULL && in->IsActive();
}

You could try this in AULab 2.0 (in Leopard) - it allows you to connect audio inputs as side chains and will only connect you when you explicitly do this.




I don't want to process data when all I'm getting is silence because
there's nothing routed to the sidechain.


sure - you shouldn't be connected in this case.

Bill

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References: 


 >Re: Quick question on configuring an AU for a certain channel config (From: "Sophia Poirier [dfx]" <email@hidden>)


 >Re: Quick question on configuring an AU for a certain channel config (From: "tahome izwah" <email@hidden>)


 >Re: Quick question on configuring an AU for a certain channel config (From: "tahome izwah" <email@hidden>)























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