Re: AUEventListenerNotify paramErr for PropertyChange events on Leopard
Re: AUEventListenerNotify paramErr for PropertyChange events on Leopard
- Subject: Re: AUEventListenerNotify paramErr for PropertyChange events on Leopard
- From: William Stewart <email@hidden>
- Date: Wed, 5 Dec 2007 19:19:01 -0800
On Dec 5, 2007, at 6:59 PM, Sophia Poirier [dfx] wrote:
On Dec 5, 2007, at 9:46 PM, William Stewart wrote:
You shouldn't need to make this call from within an AU - all you
need to do there is call the AUBase::PropertyChanged method (which
in turn will turn around and call of the registered property change
listeners iwth the AU).
Oh hmmm, I thought it had to do with not blocking a render thread,
that it was better to call AUEventListenerNotify() if you're sending
the property change from within audio rendering. Am I incorrect
about this and is PropertyChanged() in actually fine for that?
Its more on the listening end for properties. The property changed
notify is executed on the thread you issue it on, but the real trouble
can start when that callback is executed. So, for instance a view that
is listening for property changes, should definitely be using the
EventListener (otherwise those callbacks would execute on the render
thread in this case).
When you instantiate a listener using the event listener (say your
view), the event listener installs a property listener on the AU. When
that property listener is called, it doesn't call the event listeners,
but rather just registers that the property has changed, and sets the
wheels in motion so that the actual event listeners will fire on their
appropriate threads.
That said, we will look into this (as there's nothing here that
looks obviously wrong to me
Thank you.
We normally don't expect the ListenerNotify to be called from property
changes, so that could be why you are seeing a discrepancy here
Bill
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