for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
int hsub = plane == 1 || plane == 2 ? s->hsub : 0;