DataTables footer callback TOTAL

Hi

I'm using 1.9.4 version, and i'm trying to put the total in the end of table...

I use the callback function, and it works fine, if i don't use filter.

When the data is filtered, the total don't sum the DISPLAY data.

"fnFooterCallback": function ( nRow, aaData ) { }

aaData is always the ALL data of table. How can I use the filtered data?