Add API for gain control on headset cameras, and use it to set a mid-range default exposure gain
Compute the frame size required for the cameras on a given headset. Copy the pixels out into an xrt_frame, then send it to a debug sink - one for SLAM tracking exposures, and 1 for controller frames. Based on a patch by Jakob Bornecrantz
Calculate and configure USB transfers to read the cameras on a WMR headset. Needs more work to make use of the received frames.