v4l2 api: supported resolution negotiation

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Hello,

I learned from V2L2 API how to detect all supported formats using
VIDIOC_ENUM_FMT.
When I perform VIDIOC_S_FMT I don't know how to fill fmt.pix.width and
fmt.pix.height, since I know only format.
How should I negotiate device resolution? Could you point me?

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