[AVT] Draft on source-specific SDP attributes: draft-lennox-mmusic-sdp-source-attributes-00

[Jonathan Lennox <[e-mail]>]

Joerg Ott, Thomas Schierl, and I have written an Internet-Draft on
source-specific SDP attributes,
draft-lennox-mmusic-sdp-source-attributes-00, now available from the I-D
repository.

The draft allows individual RTP sources to be described in SDP session
descriptions, generalizing the mechanism used by the draft on RTCP
extensions for single-source multicast (draft-ietf-avt-rtcpssm).  It was
also originally motivated by the desire to support ssrc-multiplexing of
H.264 SVC, as originally used by draft-wenger-avt-rtp-svc-02 and
draft-schierl-mmusic-layered-codec-01, though the latest revisions of those
drafts have dropped support for ssrc-multiplexing for other reasons.

Comments are welcome.

I'm sending this annoucement to the AVT group as well as MMUSIC, as the
draft's mechanisms have non-trivial interactions with RTP collision
detection.   Please direct followups to only one of the working group
mailing lists, depending on the topic being discussed.

-- 
Jonathan Lennox -- Layered Media
[e-mail]

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A New Internet-Draft is available from the on-line Internet-Drafts 
directories.


	Title		: Source-Specific Media Attributes in the Session
Description Protocol (SDP)
	Author(s)	: J. Lennox, et al.
	Filename	: draft-lennox-mmusic-sdp-source-attributes-00.txt
	Pages		: 20
	Date		: 2007-2-26
	
   The Session Description Protocol provides mechanisms to describe
   attributes of multimedia sessions and of individual media streams
   (e.g., Real-time Transport Protocol (RTP) sessions) within a
   multimedia session, but does not provide any mechanism to describe
   individual media sources within a media stream.  This document
   defines a mechanism to describe RTP media sources, identified by
   their Synchronization Source Identifiers (SSRCs), in SDP, associate
   attributes with these sources, and express relationships among
   sources.  It also defines a number of source-level attributes which
   can be used to describe properties of media sources.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-lennox-mmusic-sdp-source-attribute
s-00.txt

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