BeginParameterChangeGesture AU event listener weirdness
BeginParameterChangeGesture AU event listener weirdness
- Subject: BeginParameterChangeGesture AU event listener weirdness
- From: Marc Poirier <email@hidden>
- Date: Tue, 19 Jul 2005 14:32:15 -0400 (EDT)
I am installing an AUEventListener for teh BeginParameterChangeGesture
type AUEvent using the AnyParameter wildcard like so:
memset(¶meterGestureBeginAUEvent, 0, sizeof(parameterGestureBeginAUEvent));
parameterGestureBeginAUEvent.mEventType = kAudioUnitEvent_BeginParameterChangeGesture;
parameterGestureBeginAUEvent.mArgument.mParameter.mAudioUnit = GetEditAudioUnit();
parameterGestureBeginAUEvent.mArgument.mParameter.mParameterID = kAUParameterListener_AnyParameter;
parameterGestureBeginAUEvent.mArgument.mParameter.mScope = kAudioUnitScope_Global;
parameterGestureBeginAUEvent.mArgument.mParameter.mElement = 0;
AUEventListenerAddEventType(auEventListener, this, ¶meterGestureBeginAUEvent);
The AUEventListener was created successfully (no error), and this event
gets added successfully, but unfortunately the listening itself doesn't
work as I would expect. When my listener callback gets the
AudioUnitParameter passed to it describing the parameter propogating the
gesture-begin event, its AudioUnitParameterID is
kAUParameterListener_AnyParameter in every case, rather than that
parameter's actual ID. This is not how it works when you install a
parameter change listener using that wildcard, and I simply don't see how
this could possibly be useful behavior, so I'm inclined to think it's a
bug. Or maybe I am doing something wrong? Any ideas are welcome...
thanks,
Marc
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