V4L2_FIELD_INTERLACED
dest->fmt.pix.field = V4L2_FIELD_INTERLACED;
if (src->fmt.pix.field == V4L2_FIELD_INTERLACED)
(field) == V4L2_FIELD_INTERLACED ||\
(field) == V4L2_FIELD_INTERLACED ||\
((field) == V4L2_FIELD_INTERLACED ||\