The plan is to use RTSP and RTP with some extensions.

Reference documents:

• RTSP
  • version 1.0, RFC 2326
  • version 2.0, draft
• RTP
  • RFC 3550
• DV over RTP
  • RFC 3189
  • RFC 3189bis, draft
• SDP
  • RFC 4566

There's a library called liveMedia, which should handle much of the protocols for us. There's already a Debian package of it. BenHutchings has added DV support to liveMedia and is now working to integrate it into DVswitch.

The extensions we will want are:

• Signaling cue/live to camera operators. The RTSP SET_PARAMETER method can be used for this. I propose parameter name "relay-status" with values "off", "cue" and "live". - BenHutchings
  I instead suggest using single byte values such as 0,1 [live],2 [cued], also allowing for 3 [live and cued]. - anonymous; please add your name
  RTSP is text-based so there is little advantage in using "single byte values". What does live and cued mean, anyway? - BenHutchings
• Triggering recording. There is a RECORD method in RTSP 1.0 but this has never been implemented and has been removed in 2.0 drafts.