Function AUParameterListenerNotify 

pub unsafe extern "C-unwind" fn AUParameterListenerNotify(
    in_sending_listener: AUParameterListenerRef,
    in_sending_object: *mut c_void,
    in_parameter: NonNull<AudioUnitParameter>,
) -> i32

Available on crate features AUComponent and AudioComponent and AudioUnitUtilities only.

Notify listeners of a past parameter change.

Parameter inSendingListener: A parameter listener generating the change and which does not want to receive a callback as a result of it. May be NULL.

Parameter inSendingObject: The object generating the change and which does not want to receive a callback as a result of it. NULL is treated specially when inListener is non-null; it signifies that none of the specified listener’s objects will receive notifications.

Parameter inParameter: The parameter which was changed.

Performs and schedules the notification callbacks of AUParameterSet, without actually setting an AudioUnit parameter value.

Clients scheduling ramped parameter changes to AudioUnits must make this call dynamically during playback in order for AudioUnitViews to be updated. When the view’s listener receives a notification, it will be passed the current value of the parameter.

A special meaning is applied if the mParameterID value of inParameter is equal to kAUParameterListener_AnyParameter. In this case, ANY listener for ANY parameter value changes on the specified AudioUnit will be notified of the current value of that parameter.

Safety

• in_sending_listener must be a valid pointer or null.
• in_sending_object must be a valid pointer or null.
• in_parameter must be a valid pointer.