Type Alias AUMIDIOutputCallback 

pub type AUMIDIOutputCallback = Option<unsafe extern "C-unwind" fn(*mut c_void, NonNull<AudioTimeStamp>, u32, NonNull<MIDIPacketList>) -> i32>;

Available on crate features AudioUnitProperties and objc2-core-audio-types and objc2-core-midi only.

Apple’s documentation

Aliased Type

pub enum AUMIDIOutputCallback {
    None,
    Some(unsafe extern "C-unwind" fn(*mut c_void, NonNull<AudioTimeStamp>, u32, NonNull<MIDIPacketList>) -> i32),
}

Variants

None

No value.

Some(unsafe extern "C-unwind" fn(*mut c_void, NonNull<AudioTimeStamp>, u32, NonNull<MIDIPacketList>) -> i32)

Some value of type T.