WebRTC MediaStream Identification in the Session Description Protocol
draft-ietf-mmusic-msid-16

Document Type Active Internet-Draft (mmusic WG)
Last updated 2017-02-07
Replaces draft-alvestrand-mmusic-msid
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication (wg milestone: Apr 2016 - Submit SDP extension... )
Document shepherd Flemming Andreasen
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IESG IESG state RFC Ed Queue
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Responsible AD Ben Campbell
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IANA IANA review state Version Changed - Review Needed
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Network Working Group                                      H. Alvestrand
Internet-Draft                                                    Google
Intended status: Standards Track                        February 7, 2017
Expires: August 11, 2017

 WebRTC MediaStream Identification in the Session Description Protocol
                       draft-ietf-mmusic-msid-16

Abstract

   This document specifies a Session Description Protocol (SDP) Grouping
   mechanism for RTP media streams that can be used to specify relations
   between media streams.

   This mechanism is used to signal the association between the SDP
   concept of "media description" and the WebRTC concept of
   "MediaStream" / "MediaStreamTrack" using SDP signaling.

   This document is a work item of the MMUSIC WG, whose discussion list
   is 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
   working documents as Internet-Drafts.  The list of current Internet-
   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 August 11, 2017.

Alvestrand               Expires August 11, 2017                [Page 1]
Internet-Draft                 MSID in SDP                 February 2017

Copyright Notice

   Copyright (c) 2017 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
   (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.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Structure Of This Document  . . . . . . . . . . . . . . .   3
     1.3.  Why A New Mechanism Is Needed . . . . . . . . . . . . . .   4
     1.4.  The WEBRTC MediaStream  . . . . . . . . . . . . . . . . .   4
   2.  The Msid Mechanism  . . . . . . . . . . . . . . . . . . . . .   5
   3.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Handling of non-signalled tracks  . . . . . . . . . . . .   7
     3.2.  Detailed Offer/Answer Procedures  . . . . . . . . . . . .   8
       3.2.1.  Generating the initial offer  . . . . . . . . . . . .   9
       3.2.2.  Answerer processing of the Offer  . . . . . . . . . .   9
       3.2.3.  Generating the answer . . . . . . . . . . . . . . . .   9
       3.2.4.  Offerer processing of the answer  . . . . . . . . . .   9
       3.2.5.  Modifying the session . . . . . . . . . . . . . . . .   9
     3.3.  Example SDP description . . . . . . . . . . . . . . . . .  10
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
     4.1.  Attribute registration in existing registries . . . . . .  10
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Appendix A.  Design considerations, rejected alternatives . . . .  13
   Appendix B.  Change log . . . . . . . . . . . . . . . . . . . . .  14
     B.1.  Changes from alvestrand-rtcweb-msid-00 to -01 . . . . . .  14
     B.2.  Changes from alvestrand-rtcweb-msid-01 to -02 . . . . . .  14
     B.3.  Changes from alvestrand-rtcweb-msid-02 to mmusic-msid-00   14
     B.4.  Changes from alvestrand-mmusic-msid-00 to -01 . . . . . .  14
     B.5.  Changes from alvestrand-mmusic-msid-01 to -02 . . . . . .  14
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