pub unsafe extern "C" fn gst_mpegts_descriptor_parse_dvb_subtitling_idx(
descriptor: *const GstMpegtsDescriptor,
idx: c_uint,
lang: *mut *mut c_char,
type_: *mut u8,
composition_page_id: *mut u16,
ancillary_page_id: *mut u16
) -> gboolean