Function AUListenerCreateWithDispatchQueue 

pub unsafe extern "C-unwind" fn AUListenerCreateWithDispatchQueue(
    out_listener: NonNull<AUParameterListenerRef>,
    in_notification_interval: f32,
    in_dispatch_queue: &DispatchQueue,
    in_block: AUParameterListenerBlock,
) -> i32

Available on crate features AUComponent and AudioComponent and AudioUnitUtilities and block2 and dispatch2 only.

Create an object for fielding notifications when AudioUnit parameter values change.

Parameter outListener: On successful return, an AUParameterListenerRef.

Parameter inNotificationInterval: The minimum time interval, in seconds, at which the callback will be called. If multiple parameter value changes occur within this time interval, the listener will only receive a notification for the last value change that occurred before the callback. If inNotificationInterval is 0, the inRunLoop and inRunLoopMode arguments are ignored, and the callback will be issued immediately, on the thread on which the parameter was changed.

Parameter inDispatchQueue: Dispatch queue on which the callback is called.

Parameter inBlock: Block called when the parameter’s value changes.

Note that only parameter changes issued through AUParameterSet will generate notifications to listeners; thus, in most cases, AudioUnit clients should use AUParameterSet in preference to AudioUnitSetParameterValue.

Safety

• out_listener must be a valid pointer.
• in_dispatch_queue possibly has additional threading requirements.
• in_block must be a valid pointer.