void ghb_set_pref_subtitle(gint titleindex, signal_user_data_t *ud);
void ghb_clear_subtitle_list(signal_user_data_t *ud);
void ghb_set_subtitle(signal_user_data_t *ud, gint track, GValue *settings);
void ghb_set_pref_subtitle(gint titleindex, signal_user_data_t *ud);
void ghb_clear_subtitle_list(signal_user_data_t *ud);
void ghb_set_subtitle(signal_user_data_t *ud, gint track, GValue *settings);