pub unsafe extern "C" fn gst_harness_add_probe(
    h: *mut GstHarness,
    element_name: *const c_char,
    pad_name: *const c_char,
    mask: GstPadProbeType,
    callback: GstPadProbeCallback,
    user_data: gpointer,
    destroy_data: GDestroyNotify
)