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val characteristics: CameraCharacteristics = ...
val context = this as Context  // assuming we are inside of an activity

val surfaceViewSize = getPreviewOutputSize(
        context, characteristics, SurfaceHolder::class.java)
val imageReaderSize = getPreviewOutputSize(
        context, characteristics, ImageReader::class.java, format = ImageFormat.YUV_420_888)

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val characteristics: CameraCharacteristics = ...

// Hardware level will be one of:
// - CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY,
// - CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_EXTERNAL,
// - CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED,
// - CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL,
// - CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_3
val hardwareLevel = characteristics.get(
        CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL)

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class SmartSize(width: Int, height: Int) {
    var size = Size(width, height)
    var long = max(size.width, size.height)
    var short = min(size.width, size.height)
    override fun toString() = "SmartSize(${long}x${short})"
}

val SIZE_1080P: SmartSize = SmartSize(1920, 1080)

fun getDisplaySmartSize(display: Display): SmartSize {

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fun <T>getMaximumOutputSize(
        characteristics: CameraCharacteristics, targetClass: Class<T>, format: Int? = null):
        Size {
    val config = characteristics.get(
            CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)

    // If image format is provided, use it to determine supported sizes; else use target class
    val allSizes = if (format == null)
        config.getOutputSizes(targetClass) else config.getOutputSizes(format)
    return allSizes.sortedWith(compareBy { it.height * it.width }).reversed()[0]

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val characteristics: CameraCharacteristics = ...
val targetClass: Class<T> = ...  // e.g. SurfaceView::class.java
val sizes = characteristics.get(
        CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
        .getOutputSizes(targetClass)

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val characteristics: CameraCharacteristics = ...
val outputFormat: Int = ...  // e.g. ImageFormat.JPEG
val sizes = characteristics.get(
        CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP)
        .getOutputSizes(outputFormat)

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val characteristics: CameraCharacteristics = ...
val supportedFormats = characteristics.get(
            CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP).outputFormats

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val session: CameraCaptureSession = ...  // from CameraCaptureSession.StateCallback

// We will be using the preview capture template for the combined streams, because
// it is optimized for low latency; for high-quality images use
// TEMPLATE_STILL_CAPTURE and for a steady frame rate use
// TEMPLATE_RECORD
val requestTemplate = CameraDevice.TEMPLATE_PREVIEW
val combinedRequest = session.device.createCaptureRequest(requestTemplate)

// Link the Surface targets with the combined request

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val session: CameraCaptureSession = ...  // from CameraCaptureSession.StateCallback

// Create the repeating request and dispatch it
val repeatingRequest = session.device.createCaptureRequest(
        CameraDevice.TEMPLATE_PREVIEW)
repeatingRequest.addTarget(previewSurface)
session.setRepeatingRequest(repeatingRequest.build(), null, null)

// Some time later...

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val session: CameraCaptureSession = ...  // from CameraCaptureSession.StateCallback
val captureRequest: CaptureRequest = ...  // from CameraDevice.createCaptureRequest()

// This will keep sending the capture request as frequently as possible until the
// session is torn down or session.stopRepeating() is called
session.setRepeatingRequest(captureRequest.build(), null, null)