Cross Session Stream Identification in the Session Description Protocol
draft-alvestrand-mmusic-msid-01

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Last updated 2012-10-15
Replaces draft-alvestrand-rtcweb-msid
Replaced by draft-ietf-mmusic-msid
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Network Working Group                                      H. Alvestrand
Internet-Draft                                                    Google
Intended status: Standards Track                        October 15, 2012
Expires: April 18, 2013

Cross Session Stream Identification in the Session Description Protocol
                    draft-alvestrand-mmusic-msid-01

Abstract

   This document specifies a grouping mechanism for RTP media streams
   that can be used to specify relations between media streams within
   different RTP sessions.

   This mechanism is used to signal the association between the RTP
   concept of SSRC and the WebRTC concept of "media stream" / "media
   stream track" using SDP signalling.

   This document is an input document for discussion.  It should be
   discussed in the MMUSIC WG list, mmusic@ietf.org.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 18, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Structure Of This Document . . . . . . . . . . . . . . . .  3
     1.2.  Why A New Mechanism Is Needed  . . . . . . . . . . . . . .  3
     1.3.  Application to the WEBRTC MediaStream  . . . . . . . . . .  4
   2.  The Msid Mechanism . . . . . . . . . . . . . . . . . . . . . .  4
   3.  The Msid-Semantic Attribute  . . . . . . . . . . . . . . . . .  5
   4.  Applying Msid to WebRTC Media Streams  . . . . . . . . . . . .  6
     4.1.  Handling of non-signalled tracks . . . . . . . . . . . . .  7
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . .  9
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  9
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     8.1.  Normative References . . . . . . . . . . . . . . . . . . .  9
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   Appendix A.  Design considerations, open questions and and
                alternatives  . . . . . . . . . . . . . . . . . . . . 10
   Appendix B.  Change log  . . . . . . . . . . . . . . . . . . . . . 11
     B.1.  Changes from rtcweb-msid-00 to -01 . . . . . . . . . . . . 11
     B.2.  Changes from rtcweb-msid-01 to -02 . . . . . . . . . . . . 11
     B.3.  Changes from rtcweb-msid-02 to mmusic-msid-00  . . . . . . 11
     B.4.  Changes from mmusic-msid-00 to -01 . . . . . . . . . . . . 12
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 12

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1.  Introduction

1.1.  Structure Of This Document

   This document extends the SSRC grouping framework [RFC5888] by adding
   a new grouping relation that can cross RTP session boundaries.

   Section 1.2 gives the background on why a new mechanism is needed.

   Section 2 gives the definition of the new mechanism.

   Section 4 gives the application of the new mechanism for providing
   necessary semantic information for the association of
   MediaStreamTracks to MediaStreams in the WebRTC API .

1.2.  Why A New Mechanism Is Needed

   When media is carried by RTP [RFC3550], each RTP media stream is
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