Function gstreamer_sys::gst_util_fraction_add

pub unsafe extern "C" fn gst_util_fraction_add(
    a_n: c_int, 
    a_d: c_int, 
    b_n: c_int, 
    b_d: c_int, 
    res_n: *mut c_int, 
    res_d: *mut c_int
) -> gboolean