All the API and related structures are located at https://github.com/Xilinx/gst-plugins-good/blob/xlnx-rebase-v1.16.3/sys/v4l2/ext/xlnx-ll/xvfbsync.h.
All the API and related structures are located at https://github.com/Xilinx/gst-plugins-good/blob/xlnx-rebase-v1.16.3/sys/v4l2/ext/xlnx-ll/xvfbsync.h.