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