Scan Driver's license with two barcodes, 2nd is PDF417

[IanDarwin]

Hi, and thanks for making this available. I wanted to switch to barcode_scan2 from the older flutter_barcode_scanner because our driver's licenses have the 15-digit license number in a small barcode above the detailed PDF417 barcode, and the older package has no way to restrict the format. Murphy's law says it will inevitably scan the wrong one.

But I have trouble: (only tested on Android 14 on Pixel phone so far) the preview area is so small (about 1/4 of the screen width) that I have to hold the license so far away that the camera seems to have trouble focusing, as it will not scan the detailed barcode at all. This does not seem to change with variations in the aspectTolerance (whose range of values and meanings could BTW stand an improvement in the docco, if anybody understands that and has a spare few minutes).

Code snippet:

var  scanOpts = const ScanOptions(
                    restrictFormat: [BarcodeFormat.pdf417],
                    android: AndroidOptions(
                        aspectTolerance: 0.5,
                        useAutoFocus: true),
        );
var result = await BarcodeScanner.scan(options: scanOpts);
if (!mounted) {
                  return;
}
if (result.type == ResultType.Cancelled) {
                  print("Cancelled");
                  return;
}
print(PDF417Decode.decode(result.rawContent));

(The decode function is my own, creating a Person object based on just the set of fields I want extracted from the driver's license; much credit to https://www.reddit.com/r/ontario/comments/egtng6/what_personal_information_can_olg_get_from_your/).

A big TIA to anyone who can assist!