Converting ImageProxy to Bitmap

So, I wanted to explore new Google's Camera API - CameraX. What I want to do, is take an image from camera feed every second and then pass it into a function that accepts bitmap for machine learning purposes.

I read the documentation on Camera X Image Analyzer:

The image analysis use case provides your app with a CPU-accessible image to perform image processing, computer vision, or machine learning inference on. The application implements an Analyzer method that is run on each frame.

..which basically is what I need. So, I implemented this image analyzer like this:

imageAnalysis.setAnalyzer { image: ImageProxy, _: Int ->
    viewModel.onAnalyzeImage(image)
}

What I get is image: ImageProxy. How can I transfer this ImageProxy to Bitmap?

I tried to solve it like this:

fun decodeBitmap(image: ImageProxy): Bitmap? {
    val buffer = image.planes[0].buffer
    val bytes = ByteArray(buffer.capacity()).also { buffer.get(it) }
    return BitmapFactory.decodeByteArray(bytes, 0, bytes.size)
}

But it returns null - because decodeByteArray does not receive valid (?) bitmap bytes. Any ideas?

from Converting ImageProxy to Bitmap