public override void upsample(ComponentBuffer[] input_buf, ref int in_row_group_ctr, int in_row_groups_avail, byte[][] output_buf, ref int out_row_ctr, int out_rows_avail)
{
if (m_use_2v_upsample)
merged_2v_upsample(input_buf, ref in_row_group_ctr, output_buf, ref out_row_ctr, out_rows_avail);
else
merged_1v_upsample(input_buf, ref in_row_group_ctr, output_buf, ref out_row_ctr);
}