geting iTotalRecords or sEcho or iTotalDisplayRecords from srver side

Hi, everybody
how can i get in datatables parameters from the topic from server side when they in another json object? I mean something like that

{"content":{"sEcho":1,"iTotalRecords":32,"iTotalDisplayRecords":32,"data":[{"engine":"Gecko","browser":"Firefox 1.0","platform":"2","version":"1.7","grade":"A"},{"engine":"SHasdasdasdmheko","browser":"Firefox 11.5","platform":"11","version":"1.8","grade":"K"},{"engine":"SHmeko","browser":"Firefox 1.5","platform":"2","version":"1.8","grade":"G"}]}}

I try use parameter "sAjaxDataProp": "content.data" but it works only for data array.

Thanks.