public override Landmark[] GetValue()
        {
            MpLandmarkList landmarkList = UnsafeNativeMethods.MpPacketGetNormalizedLandmarkList(ptr);
            var            landmarks    = LandmarkList.PtrToLandmarkArray(landmarkList);

            UnsafeNativeMethods.MpLandmarkListDestroy(landmarkList);

            return(landmarks);
        }