pub unsafe extern "C" fn dzl_frame_source_add(
frames_per_sec: c_uint,
callback: GSourceFunc,
user_data: gpointer,
) -> c_uintpub unsafe extern "C" fn dzl_frame_source_add(
frames_per_sec: c_uint,
callback: GSourceFunc,
user_data: gpointer,
) -> c_uint