case 'rmcs': // Reference Movie Cpu Speed atom
                $atom_structure['version']          = getid3_lib::BigEndian2Int(substr($atom_data,  0, 1));
                $atom_structure['flags_raw']        = getid3_lib::BigEndian2Int(substr($atom_data,  1, 3)); // hardcoded: 0x0000
                $atom_structure['cpu_speed_rating'] = getid3_lib::BigEndian2Int(substr($atom_data,  4, 2));
                break;