Barcode printing is available in the tcpdf library that FA uses for it's reporting. Checkout the TCPDF examples and write your reports for the barcode label size, type and layout needed.
Sample usage in a reporting/rep###.php file is:
// ..
// ..
// define barcode style
$style = array(
'position' => 'L', // If blank string, barcode starts on left edge of page
'stretch' => false,
'fitwidth' => true,
'cellfitalign' => '',
'border' => true,
'padding' => 'auto',
'fgcolor' => array(0,0,0),
'bgcolor' => false, //array(255,255,255),
'text' => true,
'font' => 'helvetica',
'fontsize' => 8,
'stretchtext' => 4
);
// EAN 8
$y = $rep->GetY();
// write1DBarcode($code, $type, $x='', $y='', $w='', $h='', $xres=0.4, $style='', $align='')
$rep->write1DBarcode('1234567', 'EAN8', 5, $y-8.5, 75, 22, 1.2, $style, 'N');
// ..
// ..