how "extra-controls" of v4l2src property works

[rahulshah118]

I have to pass exposure time using gstreamer pipeline.
After some online reading i found that we can send it using "extra-controls"
property of v4l2src.
How this property mapped with V4L2_CID_PRIVATE_BASE or how to map this
property with any v4l2 camera driver.
which ioctl called when i use extra-control proeprty?
If i want configurable property in camera driver using gstreamer pipeline
then how to achieve that?



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