I'm trying to setup a listener for kAudioProcessPropertyIsRunningOutput but it's never triggered. I get calls for kAudioProcessPropertyIsRunning and kAudioProcessPropertyDevices but not for kAudioProcessPropertyIsRunningInput or kAudioProcessPropertyIsRunningOutput.
class MyDelegate: PropertyListenerDelegate {
func propertiesChanged(properties: [AudioObjectPropertyAddress]) {
print(properties)
}
}
var myDelegate = MyDelegate()
var processes = try AudioHardwareSystem.shared.processes
for process in processes {
process.delegates += [myDelegate]
try process.addListener(forProperties: [AudioObjectPropertyAddress(mSelector: kAudioPropertyWildcardPropertyID, mScope: kAudioObjectPropertyScopeWildcard, mElement: kAudioObjectPropertyElementWildcard)])
}
Xcode 16.1
macOS 15.0.1
existentialaudio
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I am unable to access the Int32 error from the errors that CoreAudio throws in Swift type AudioHardwareError. This is critical. There is no way to access the errors or even create an AudioHardwareError to test for errors.
do {
_ = try AudioHardwareDevice(id: 0).streams // will throw
} catch {
if let error = error as? AudioHardwareError { // cast to AudioHardwareError
print(error) // prints error code but not the errorDescription
}
}
How can get reliably get the error.Int32? Or create a AudioHardwareError with an error constant? There is no way for me to handle these error with code or run tests without knowing what the error is.
On top of that, by default the error localizedDescription does not contain the errorDescription unless I extend AudioHardwareError with CustomStringConvertible.
extension AudioHardwareError: @retroactive CustomStringConvertible {
public var description: String {
return self.localizedDescription
}
}