Receiving kAudioUnitEvent_ParameterValueChange during bounce
Receiving kAudioUnitEvent_ParameterValueChange during bounce
- Subject: Receiving kAudioUnitEvent_ParameterValueChange during bounce
- From: Nuno Santos <email@hidden>
- Date: Tue, 05 Mar 2019 10:56:20 +0000
Hi everyone,
I’m having a really tricky problem with kAudioUnitEvent_ParameterValueChange on
AudioUnit V2 implementation of my plugin.
While automating a parameter from 0 to 1 along 2 bars with tempo set at 120
bpm’s I get around 38 kAudioUnitEvent_ParameterValueChange calls (I have
timestamped the events):
#1 10:28:32.576 - 0
#2 10:28:33.136 - 0.04
#3 10:28:33.205 - 0.07
…
#36 10:28:35.805 - 0.94
#37 10:28:35.876 - 0.97
#38 10:28:35.990 - 1
The problem is that when bouncing or exporting the very same bar with Logic Pro
(10.4.0) I only get the following three events and they arrive at the same time:
#1 - 10:41:21.355 - 0
#2 - 10:41:21.355 - 1
#3 - 10:41:21.355 - 0.88
This behaviour renders the parameter automation completely useless and my
clients are complaining. Curiously, the problem doesn’t manifest itself with
the very same code and plugin on Ableton Live.
I’m registering the listener for events with the following call:
AUEventListenerCreate(IAUEventListenerDispatcher, _controller,
CFRunLoopGetMain(), kCFRunLoopDefaultMode, 0.05, 0.05, &_eventListener);
And the code for the listener is the following:
void IAUEventListenerDispatcher(void *inRefCon, void *inObject, const
AudioUnitEvent *inEvent, UInt64 inHostTime, Float32 value)
{
IController* controller = (IController*) inObject;
switch (inEvent->mEventType)
{
case kAudioUnitEvent_BeginParameterChangeGesture:
{
break;
}
case kAudioUnitEvent_EndParameterChangeGesture:
{
break;
}
case kAudioUnitEvent_ParameterValueChange:
{
controller->kernel()->setParameter(inEvent->mArgument.mParameter.mParameterID,
QVariant(value), false);
break;
}
case kAudioUnitEvent_PropertyChange:
{
break;
}
}
}
Does anyone has an idea of why this happens in Logic Pro?
Thanks in advance!
Best regards,
Nuno Santos
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