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RTCP Source Description Item SRCNAME to Label Individual Media Sources
draft-westerlund-avtext-rtcp-sdes-srcname-03

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Last updated: 2013-10-21
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Network Working Group                                      M. Westerlund
Internet-Draft                                                 B. Burman
Intended status: Standards Track                                Ericsson
Expires: April 24, 2014                                 October 21, 2013

 RTCP Source Description Item SRCNAME to Label Individual Media Sources
              draft-westerlund-avtext-rtcp-sdes-srcname-03

Abstract

   This document defines a new Source Description (SDES) item called
   SRCNAME, which uniquely identifies a single media source, like a
   camera or a microphone.  It also enables identification of the
   encoding to support when multiple ones are produced.  That way anyone
   receiving the SDES information from a set of interlinked RTP sessions
   can determine which SSRCs are logically related to the same media
   source and encoding.  In addition the new SDES item is also defined
   for usage with both a header extension and with the SDP source
   specific media attribute ("a=ssrc").  Enabling an end-point to
   receive the SRCNAME with the relevant RTP packets, as well as RTCP,
   or learn the source bindings through signalling, ahead of receiving
   RTP and RTCP packets.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 24, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

Westerlund & Burman      Expires April 24, 2014                 [Page 1]
Internet-Draft              RTCP SDES SRCNAME               October 2013

   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  3
     2.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Motivation . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Solution . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
     4.1.  SRCNAME Format . . . . . . . . . . . . . . . . . . . . . .  6
     4.2.  SDES Item SRCNAME  . . . . . . . . . . . . . . . . . . . .  7
     4.3.  SRCNAME in SDP . . . . . . . . . . . . . . . . . . . . . .  7
     4.4.  SRCNAME as RTP Header Extension  . . . . . . . . . . . . .  8
   5.  Usage with the Offer/Answer Model  . . . . . . . . . . . . . .  8
   6.  Backward Compatibility . . . . . . . . . . . . . . . . . . . .  9
   7.  Relation to Application Token  . . . . . . . . . . . . . . . .  9
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 11
     10.2. Informative References . . . . . . . . . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13

Westerlund & Burman      Expires April 24, 2014                 [Page 2]
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1.  Introduction

   This specification defines a new RTP/RTCP [RFC3550] Source
   Description (SDES) item called Source Name (SRCNAME).  There exist
   different use cases, including simulcast and scalable encoding, where
   a sender transmit multiple RTP packet streams containing full or
   partial encodings of the same media source.  This include multiple
   independent encodings, where it is desirable to identify the

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