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Multiple SSRCs in SDP Media Descriptions

Multiple SSRCs in SDP Media Descriptions. IETF#85, Atlanta, U.S.A draft-westerlund-mmusic-max-ssrc-00.txt (previously avtcore) Christer.Holmberg@ericsson.com. IPR. https://datatracker.ietf.org/ipr/1639/. PROBLEM.

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Multiple SSRCs in SDP Media Descriptions

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  1. Multiple SSRCs in SDP Media Descriptions IETF#85, Atlanta, U.S.A draft-westerlund-mmusic-max-ssrc-00.txt (previously avtcore) Christer.Holmberg@ericsson.com

  2. IPR • https://datatracker.ietf.org/ipr/1639/

  3. PROBLEM • A single SDP media description (m- line) can represent multiple media sources (SSRC) • Each source can use codecs negotiated for the media description. • An entity might not be able to simultaneously send/receive the same codec, or certain combinations of codecs, on all sources.

  4. SOLUTION • New SDP attributes • For a given SDP media description, indicate sending and receiving capabilities of multiple media sources, based on codec usage. • ”I can send 2 streams using codec X and 1 stream using codec Y.” • ”I can receive any number of streams using codec X.” • a=max-send-ssrc • a=max-recv-ssrc

  5. EXAMPLES m=video 49200 RTP/AVP 99 a=rtpmap:99 H264/90000 a=max-send-ssrc: {*:2} a=max-recv-ssrc: {*:4} m=video 49200 RTP/AVP 9697 a=rtpmap:96 H264/90000 a=rtpmap:97 H263-2000/90000 a=max-send-ssrc: {96:2&97:3} {96:1&97:4} {97:5} a=max-recv-ssrc:{*:1}

  6. NEXT STEP • Interest? • Milestone? • Adopt draft?

  7. THANK YOU FOR LISTENING!

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