copy_elem         394 libavfilter/vf_rotate.c             copy_elem(dst + i*elem_size, src + (len-i-1)*src_linesize, elem_size);
copy_elem         398 libavfilter/vf_rotate.c             copy_elem(dst + i*elem_size, src + (len-i-1)*elem_size, elem_size);
copy_elem         402 libavfilter/vf_rotate.c             copy_elem(dst + i*elem_size, src + i*src_linesize, elem_size);