Confusing capture plane and output plane

Hello,

I’m confused the naming of caputre_plane and output plane.

In some ways, output_plane is also an output
In some ways, capture_plane is also an output.

You can help me understand the naming system clearly?

Thank you.

Hi,
The naming is from public v4l2 specs. Please check:
https://www.kernel.org/doc/html/v4.12/media/uapi/v4l/buffer.html