How to save a custom filter?

paupiette

I have added a custom filter, to filter some rows when an input is checked or not:

                    $.fn.dataTableExt.afnFiltering.push(
                        function( p_Settings, p_Data, p_DataIndex )
                        {
                            var l_Checked = $("#onlyRedRows").prop("checked");
                            var l_Row = p_Settings.aoData[p_DataIndex].nTr;
                            var l_IsRed = $(l_Row).attr("data-isRed");

                            if(l_Checked)
                            {
                                if(l_IsRed == "true")
                                {
                                    return true;
                                }
                                return false;
                            }
                            return true;
                        }
                    );

It works fine.
Now I would like to save this filter in the cookie thanks to the option stateSave.
I don't know how to do it... I tried to use the options fnStateSaveParams, fnStateLoadParams. But I can't figure it out. Anybody has an example please?