You can look at this thread for info on the format of DS to Dashboard Packets.
http://www.chiefdelphi.com/forums/sh...46&postcount=3
You can only receive the user data in these packets and they are forwarded from DS to the Dashboard.
The DS/cRIO streams are off-limits. You can only interact by stuffing your user data at the cRIO which then will become part of the DS to Dashboard packets.
If you want to stream your own camera data you will have to do it within the 984 bytes of user data which is sent every 50 hz.