code: function _fnAjaxDataSrc ( oSettings, json )
  	{
  		var dataSrc = $.isPlainObject( oSettings.ajax ) && oSettings.ajax.dataSrc !== undefined ?
  			oSettings.ajax.dataSrc :
  			oSettings.sAjaxDataProp; // Compatibility with 1.9-.
  	
  		// Compatibility with 1.9-. In order to read from aaData, check if the
  		// default has been changed, if not, check for aaData
  		if ( dataSrc === 'data' ) {
  			return json.aaData || json[dataSrc];
  		}
  	
  		return dataSrc !== "" ?
  			_fnGetObjectDataFn( dataSrc )( json ) :
  			json;
  	}
docs: Get the data from the JSON data source to use for drawing a table. Using
  `_fnGetObjectDataFn` allows the data to be sourced from a property of the
  source object, or from a processing function.
  @param {object} oSettings dataTables settings object
  @param  {object} json Data source object / array from the server
  @return {array} Array of data to use