Add a string parameter to an AudioUnit

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+1 Q:

Add a string parameter to an AudioUnit

For instance, this AudioUnit has to connect to a host through the network, and the hostname has to be configured in a Cocoa View, and has to be saved so that reloading the project restores the hostname.

How would you do that (interface + parameter saving, apart from the network thing of course)?

+1 A:

You need to implement the SaveState() and RestoreState() methods in your AudioUnit. These functions will be called when the sequencer saves and opens a document, respectively, and give you the chance to store data alongside a particular plugin instance.

The definition for these functions can be found in the file AUBase.h in the AudioUnit SDK.

Nik Reiman 2010-09-29 12:02:29

Indeed, http://lists.apple.com/archives/coreaudio-api/2008/Feb/msg00112.html says the same thing.

moala 2010-09-29 12:49:00

Seems that http://code.google.com/p/vstau/source/browse/trunk/VSTAU.cpp shows a good example in VSTAU::SaveState and VSTAU::RestoreState, for storing whole (VST) chunks in AU's document storage.

moala 2010-09-29 13:05:54

But how would you send the NSString from the CocoaView to the AudioUnit Kernel?

moala 2010-10-01 11:48:16

moala 2010-10-01 15:19:16

But how would you send the NSString (or anything else) from the AudioUnit Kernel to the CocoaView?

moala 2010-10-05 15:37:10

@moala, you should make that a separate question... it's kind of O/T here. :)

Nik Reiman 2010-10-05 17:50:46

@Nik Reiman: 'k, you're right.

moala 2010-10-07 12:07:08

Anyway, I have the answer: use Audio Unit's Properties (AudioUnitGetProperty, AudioUnitSetProperty), event notification (PropertyChanged) and AudioUnitEvent listeners (AUEventListenerCreate). See CoreAudio's Audio Unit Filter example for instance for a model.

moala 2010-10-07 12:10:36

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Add a string parameter to an AudioUnit

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