Function CMAudioDeviceClockSetAudioDeviceUID 

pub unsafe extern "C-unwind" fn CMAudioDeviceClockSetAudioDeviceUID(
    clock: &CMClock,
    device_uid: Option<&CFString>,
) -> i32

Available on crate features CMAudioDeviceClock and CMSync only.

Changes the CoreAudio device the clock is tracking.

Pass NULL for deviceUID to make the clock track the default device.