Setting a custom/nongeneric AU property using AudioUnitSetProperty()
Setting a custom/nongeneric AU property using AudioUnitSetProperty()
- Subject: Setting a custom/nongeneric AU property using AudioUnitSetProperty()
- From: Cormac Daly <email@hidden>
- Date: Wed, 22 Nov 2006 16:29:00 +0000
Hello,
My application utilizes a specific audio unit to synthesize a MIDI
sequence. The vendor of the audio unit has provided me with an opcode
and a struct which are to be provided to the AudioUnitSetProperty
method so my application can instruct the AU to load specific files.
The opcode in question is NIK\0 - this appears to be a string, but
the vendor informs me that it should be represented as a four
character code in order to pass it to AudioUnitSetProperty. Some
quick googling has informed me that four character codes are
represented on the Mac platform as OSType datatypes, hence my attempt
to pass it in this manner. However, I am having no luck - although
admittedly my attempts so far are a little flaky:
...
LoadCallStruct loadCallStructInstance = {2, 0, -1, 2,
"multiTest1.nkm", 0};
OSType niOpcode = "NIK0";
ComponentResult loadCallResult;
loadCallResult = AudioUnitSetProperty(outputAU, niOpcode,
kAudioUnitScope_Global, 0, & loadCallStructInstance, sizeof
( loadCallStructInstance));
I have not experienced any errors or warnings but I cannot hear any
results - can anyone shed some light on how I can get this working?
Or on how to tell if the property was set correctly, perhaps by
interpreting loadCallResult?
Thanks,
Cormac
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