private void RegisterEvent()
{
_eventDetectedCallback = (IntPtr trigger, IntPtr source, int streamId, IntPtr result, IntPtr _) =>
{
Detected?.Invoke(this, CreateMovementDetectedEventArgs(result));
};
}
private async void Frame(ThreadPoolTimer timer)
{
if (cam.CameraStreamState != CameraStreamState.Streaming)
{
return;
}
if (!semaphore.Wait(0))
{
return;
}
try
{
const BitmapPixelFormat InputPixelFormat = BitmapPixelFormat.Nv12;
using (VideoFrame frame = new VideoFrame(InputPixelFormat, (int)properties.Width, (int)properties.Height))
{
await cam.GetPreviewFrameAsync(frame);
var faces = await tracker.ProcessNextFrameAsync(frame);
var b = frame.SoftwareBitmap;
Detected?.Invoke(this, Tuple.Create(faces, b.PixelWidth, b.PixelHeight));
}
}
finally
{
semaphore.Release();
}
}
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));
}
}
private static void OnTick(object state)
{
var lastInput = NativeUtils.GetLastInputTime();
var idleTime = Environment.TickCount - lastInput;
if (idleTime >= _timeout && _lastTime < lastInput)
{
_lastTime = lastInput;
Detected?.Invoke(null, EventArgs.Empty);
}
}
internal override void OnEventDetected(IntPtr trigger, IntPtr source, int streamId,
IntPtr result, IntPtr _)
{
try
{
Detected?.Invoke(this, CreatePersonAppearanceChangedEventArgs(result));
}
catch (Exception e)
{
MultimediaLog.Error(MediaVisionLog.Tag, "Failed to invoke Recognized event.", e);
}
}
private void TextAPIDetected()
{
try
{
if (WasDetected)
{
Log.Error("TextAPI sent the register event twice now! Please report to TextAPI author.", Log.PRINT_MESSAGE);
return;
}
WasDetected = true;
Detected?.Invoke();
}
catch (Exception e)
{
Log.Error(e);
}
}
/// <summary>
/// Raises the <see cref="Detected"/> event.
/// </summary>
protected virtual void OnDetected()
{
Detected?.Invoke(this, EventArgs.Empty);
}
