private static extern void set_anim_callbacks( fnType_Vs play_fn, fnType_I is_playing_fn, fnType_S get_playing_fn, fnType_S list_fn, fnType_V enable_ambient_fn, fnType_V disable_ambient_fn );
private static extern void set_marytts_callbacks( fnType_Vs speak_fn, fnType_I is_speaking_fn );