Re: AudioUnitEvent Listener
Re: AudioUnitEvent Listener
- Subject: Re: AudioUnitEvent Listener
- From: William Stewart <email@hidden>
- Date: Thu, 19 Feb 2004 10:57:41 -0800
The AnyParameter "ID" is to notify, but not to listen to.. .There's an
example of using this in AUHosting (where the preset is changed, and
the code issues a notification that essentially says, check to see if
any parameter's value has changed, and if so notify the listener)...
You have to register explicitly for every parameter you want to listen
too. The GenericView does this (the code for this is in the SDK
already) for an example of how to use this.
AUEventListener just extends the parameter listener to create semantics
for both property listening/notification and the begin/end gestures...
but uses the existing functionality (and is compatible with) the
original parameter listener
Bill
On 19/02/2004, at 9:39 AM, Robert Grant wrote:
A follow up - rereading the docs, headers etc helped me find:
kAUParameterListener_AnyParameter which answers my question about
watching for any parameters. However when I try to add this parameter
to my listener (which was successfully created) I get -50!
Here's my code for setting up the parameter:
AudioUnitParameter param;
param.mParameterID = kAUParameterListener_AnyParameter;
param.mAudioUnit = m_unit;
param.mScope = kAUParameterListener_AnyParameter;
param.mElement = kAUParameterListener_AnyParameter;
status = AUListenerAddParameter(m_listenerRef, self, ¶m);
// status returns with -50
Thanks for any pointers,
Robert.
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