Hello Hans, On 14.02.2018 13:13, Hans Verkuil wrote: > > On 14/02/18 13:09, Florian Echtler wrote: >> >> The internal device memory contains a table with two bytes for each sensor pixel >> (i.e. 960x540x2 = 1036800 bytes) that basically provide individual black and >> white levels per-pixel that are used in preprocessing. The table can either be >> set externally, or the sensor can be covered with a black/white surface and a >> custom command triggers an internal calibration. >> >> AFAICT the usual V4L2 controls are unsuitable for this sort of data; do you have >> any suggestions on how to approach this? Maybe something like a custom IOCTL? > > So the table has a fixed size? > You can use array controls for that, a V4L2_CTRL_TYPE_U16 in a two-dimensional array > would do it. Good to know, thanks. > See https://hverkuil.home.xs4all.nl/spec/uapi/v4l/vidioc-queryctrl.html for more > information on how this works. This means I have to implement QUERY_EXT_CTRL, G_EXT_CTRLS and S_EXT_CTRLS, correct? Will this work in parallel to the "regular" controls that use the control framework? Best, Florian -- SENT FROM MY DEC VT50 TERMINAL
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