override fun onOpened(camera: CameraDevice) {
    val barcodeDetector = BarcodeDetector.Builder(context!!)
        .setBarcodeFormats(Barcode.QR_CODE or Barcode.DATA_MATRIX)
        .build()

    if (!barcodeDetector.isOperational) {
        // TODO
    }

    val imgReader = ImageReader.newInstance(desiredWidth, desiredHeight, ImageFormat.JPEG, 1)
    imgReader.setOnImageAvailableListener({ reader ->
        val cameraImage = reader.acquireNextImage()

        val buffer = cameraImage.planes.first().buffer
        val bytes = ByteArray(buffer.capacity())
        buffer.get(bytes)

        val bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.count(), null)
        val frameToProcess = Frame.Builder().setBitmap(bitmap).build()
        val barcodeResults = barcodeDetector.detect(frameToProcess)

        if (barcodeResults.size() > 0) {
            Log.d(TAG, "Barcode detected!")
            Toast.makeText(context!!, "Barcode detected!", Toast.LENGTH_SHORT).show()
        } else {
            Log.d(TAG, "No barcode found")
        }

        cameraImage.close()
    }, cameraBkgHandler)


    val captureStateCallback = object : CameraCaptureSession.StateCallback() {
        override fun onConfigured(session: CameraCaptureSession) {
            val builder = camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)

            builder.addTarget(binding.cameraPreview.holder.surface)
            builder.addTarget(imgReader.surface)
            session.setRepeatingRequest(builder.build(), null, null)
        }

        override fun onConfigureFailed(session: CameraCaptureSession) {
            // TODO
            Log.d(TAG, "onConfigureFailed")
        }
    }

    camera.createCaptureSession(
        listOf(binding.cameraPreview.holder.surface, imgReader.surface),
        captureStateCallback,
        cameraBkgHandler
    )
}