pub unsafe extern "C" fn gst_clock_add_observation_unapplied(
clock: *mut GstClock,
observation_internal: GstClockTime,
observation_external: GstClockTime,
r_squared: *mut c_double,
internal: *mut GstClockTime,
external: *mut GstClockTime,
rate_num: *mut GstClockTime,
rate_denom: *mut GstClockTime,
) -> gboolean