the problem is how to actually feed the bars to the emulator, not the actual decoding. shall we load a png of the barcode? shall we load a binary representation of the barcode (as the available gba e-card "dump") ? shall we store the sequence of pixels as a sequence of 0s-1s in xml and load from there?
we don't have support for screen capturing through you webcam, so it's not obvious how to proceed