QR code in Universal Windows

Question

How correct way to preview video and recognize QR (any codes with ZXing)?

In windows phone 8.1 i start preview with MediaCapture and with VideoEffect recognize QR code.

In Universal Windows VideoEffect not work.

Recognize by timer with CapturePhotoToStorageFileAsync is slowly.

Answer 1

So, my solution

1. Create new WinRT project "Windows Runtime Component (Universal Windows)

2. In WinRT create

class CaptureVideoEffect : IBasicVideoEffect (from Windows.Media.Effects)

3. Attach effect to MediaCapture

await capture.AddEffectAsync(MediaStreamType.VideoPreview, typeof(CaptureVideoEffect).FullName, ...);

4. Now in CaptureVideoEffect.ProcessFrame(ProcessVideoFrameContext context) you get RealTime video output

5. In CaptureVideoEffect.ProcessFrame skip frame if previous not finish decoded

6. Get image as byte[]

var frameSize = inputFrameBitmap.PixelWidth * inputFrameBitmap.PixelHeight * 4;
var frameBuffer = new Windows.Storage.Streams.Buffer((uint)frameSize);
inputFrameBitmap.CopyToBuffer(frameBuffer);
byte[] bitmap = frameBuffer.ToArray();

7. Decode with

result = barcodeReader.Decode(bitmap, inputFrameBitmap.PixelWidth, inputFrameBitmap.PixelHeight, BitmapFormat.RGB32);

public sealed class BarcodeReader
{
     public Result Decode([ReadOnlyArray] byte[] rawRGB, int width, int height, BitmapFormat format);
}