I'm trying to get/set the rate of an AudioUnit with subtype
`kAudioUnitSubType_NewTimePitch`.
The audio unit is added to an `AUGraph`, through an `AUNode`, which has the
following component description:
acd->componentType = kAudioUnitType_Effect;
acd->componentSubType = kAudioUnitSubType_NewTimePitch;
acd->componentManufacturer = kAudioUnitManufacturer_Apple;
According to `AudioUnitParameters.h`, get/set the rate should be as simple as
get/set the rate parameter on the audio unit.
// rate control.
// Global, rate, 1/32 -> 32.0, 1.0
kNewTimePitchParam_Rate
= 0,
However, while setting the value seems no problem (no error is returned)
getting the value yields a `OSStatus` with value `-10878
(kAudioUnitErr_InvalidParameter)`.
Here is how I set the value :
- (void)setTempo:(float)value {
OSStatus err = noErr;
err = AudioUnitSetParameter(tempoUnit, kNewTimePitchParam_Rate,
kAudioUnitScope_Global, 0, (Float32)value, 0);
if (err != noErr) {
NSLog(@"Could not set tempo unit rate: %d", err);
} // no error
}
and how I (try to) get it :
- (float)tempo {
OSStatus err = noErr;
Float32 value = 1.0;
err = AudioUnitGetParameter(tempoUnit, kNewTimePitchParam_Rate,
kAudioUnitScope_Global, 0, &value);
if (err != noErr) { // -10878
NSLog(@"Could not get tempo unit rate: %d", err);
}
return value;
}
The input of the node is connected to a mixer node, and the output to the
RemoteIO unit.
Any ideas ?
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