HDR10 is a high dynamic range standard for 10-bit video streams, allowing viewers better brightness and color contrast resulting in recreation of more realistic video frames. This HDR10 information is static metadata which is passed before the video frames to tell the display that incoming input is going to be HDR10. AMD offers this solution as a better alternative to the HDMI-only connectivity solution.
Refer to H.264/H.265 Video Codec Unit LogiCORE IP Product Guide (PG252) for how exactly HDR10 metadata is parsed by the AMD VCU software stack.
For more information, see the PL DDR HDR10 HDMI Video Capture and Display wiki page.