public void DidOutputMetadataObjects(AVCaptureMetadataOutput captureOutput, AVMetadataObject[] metadataObjects, AVCaptureConnection connection)
{
if (codeFrame is null || preview is null)
{
return;
}
if (metadataObjects.Length == 0)
{
codeFrame.Frame = CGRect.Empty;
return;
}
var readableObject = metadataObjects[0] as AVMetadataMachineReadableCodeObject;
if (readableObject.Type != AVMetadataObjectType.QRCode)
{
return;
}
var qrObject = preview.GetTransformedMetadataObject(readableObject);
codeFrame.Frame = qrObject.Bounds;
if (readableObject.StringValue is string value)
{
Detected?.Invoke(this, new BarcodeDetectedEventArgs(value));
}
}
void step(NSTimer timer)
{
if (sessionManager.Barcodes == null || sessionManager.Barcodes.Count < 1)
{
return;
}
lock (sessionManager) {
barcodeIndex = (barcodeIndex + 1) % sessionManager.Barcodes.Count;
var barcode = (AVMetadataMachineReadableCodeObject)sessionManager.Barcodes [barcodeIndex];
if (barcodeTimer != null)
{
barcodeTimer.Invalidate();
}
barcodeTimer = NSTimer.CreateScheduledTimer(0.5, this, new Selector("removeDetectedBarcodeUI"), null, false);
var transformedBarcode =
(AVMetadataMachineReadableCodeObject)previewLayer.GetTransformedMetadataObject(barcode);
CGPath barcodeBoundary = createPathForPoints(transformedBarcode.Corners);
CATransaction.Begin();
CATransaction.DisableActions = true;
removeDetectedBarcodeUI();
barcodeTargetLayer.AddSublayer(barcodeOverlayLayer(barcodeBoundary, OverlayColor));
CATransaction.Commit();
string noteString = barcode.StringValue;
int note = 0;
if (int.TryParse(noteString, out note))
{
// barcode data is a MIDI note (or at least an int that we presume can be a note
note -= 24;
if (note >= 0 && note <= 127)
{
synth.StartPlayNoteNumber(note);
Thread.Sleep(TimeSpan.FromMilliseconds(0.5));
synth.StopPlayNoteNumber(note);
}
}
else
{
// barcode data is something else
Console.WriteLine("Barcode string data: " + noteString);
}
}
}
