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How can I access to focal length of HoloLens? Is there any sample code?

I'm trying to use the research mode of HoloLens.
I want to make the point cloud data from depth image of HoloLens using PCL.
To do that, PCL needs focal length to covert depth image to point cloud.

According to this website, it seems that we can get the focal length from matrix. But there is no sample code, so I could not understand how to access.

Does anyone have the sample code of access to HoloLens camera information?

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