private void std_huff_tables()
{
add_huff_table(ref m_dc_huff_tbl_ptrs[0], bits_dc_luminance, val_dc_luminance);
add_huff_table(ref m_ac_huff_tbl_ptrs[0], bits_ac_luminance, val_ac_luminance);
add_huff_table(ref m_dc_huff_tbl_ptrs[1], bits_dc_chrominance, val_dc_chrominance);
add_huff_table(ref m_ac_huff_tbl_ptrs[1], bits_ac_chrominance, val_ac_chrominance);
}