void(*camera_added)(const _dali_id_t & id);
    void(*camera_removed)(const _dali_id_t & id);
    void(*service_state_changed)(const bool & running);
    void(*camera_state_changed)(const _dali_camera_t * _camera, const bool & active);
    void(*camera_orientation_changed)(const _dali_camera_t * _camera, const CameraOrientation & orientation);
    void(*camera_face_information_changed)(const _dali_camera_t * _camera, const _face_rect_t * _faces, const int & nFaces);
    void(*camera_eis_changed)(const _dali_camera_t * _camera, const bool & enabled);
    void(*camera_draw_rect_changed)(const _dali_camera_t * _camera, const bool & enabled);
    void(*camera_stereo_changed)(const _dali_camera_t * _camera, const bool & stereo);
    void(*camera_pfacing_changed)(const _dali_camera_t * _camera, const int & nFaces, const float pfacing[4]);