public static extern void sws_freeVec(SwsVector* a);
 public static extern SwsVector* sws_cloneVec(SwsVector* a);
 public static extern void sws_printVec2(SwsVector* a, AVClass* log_ctx, int log_level);
 public static extern void sws_shiftVec(SwsVector* a, int shift);
 public static extern void sws_subVec(SwsVector* a, SwsVector* b);
 public static extern void sws_convVec(SwsVector* a, SwsVector* b);
 public static extern void sws_normalizeVec(SwsVector* a, double height);
 public static extern void sws_scaleVec(SwsVector* a, double scalar);