Trouble capturing still images with StillCapture role on Raspberry Pi

[dominik greitmann]

Hello,
I am currently setting up a Raspberry Pi Camera using the libcamera library.
I would like to capture still images and therefore want to use the StillCapture role. However, I am having trouble finding the correct format or reading the image data from the buffer and saving it as an image file.
With the Viewfinder role, everything works fine, but since I care about the quality of the images, I would prefer to use the StillCapture role.
Here is my setup:

  *
Raspberry Pi Camera v2.1
  *
Raspberry Pi 4 Model B Rev 1.2

I've also attached the relevant code files and an example image.
I would be very grateful for any help or suggestions.
Best regards,
Dominik Greitmann
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