coreaudio_sys::audio_unit::HostCallback_GetTransportState

type HostCallback_GetTransportState = Option<extern fn(inHostUserData: *mut c_void, outIsPlaying: *mut Boolean, outTransportStateChanged: *mut Boolean, outCurrentSampleInTimeLine: *mut Float64, outIsCycling: *mut Boolean, outCycleStartBeat: *mut Float64, outCycleEndBeat: *mut Float64) -> OSStatus>;