Javascript Session Establishment Protocol
draft-ietf-rtcweb-jsep-16

Document Type Active Internet-Draft (rtcweb WG)
Last updated 2016-09-20
Replaces draft-uberti-rtcweb-jsep
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Network Working Group                                          J. Uberti
Internet-Draft                                                    Google
Intended status: Standards Track                             C. Jennings
Expires: March 24, 2017                                            Cisco
                                                        E. Rescorla, Ed.
                                                                 Mozilla
                                                      September 20, 2016

               Javascript Session Establishment Protocol
                       draft-ietf-rtcweb-jsep-16

Abstract

   This document describes the mechanisms for allowing a Javascript
   application to control the signaling plane of a multimedia session
   via the interface specified in the W3C RTCPeerConnection API, and
   discusses how this relates to existing signaling protocols.

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
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   This Internet-Draft will expire on March 24, 2017.

Copyright Notice

   Copyright (c) 2016 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

Uberti, et al.           Expires March 24, 2017                 [Page 1]
Internet-Draft                    JSEP                    September 2016

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  General Design of JSEP  . . . . . . . . . . . . . . . . .   4
     1.2.  Other Approaches Considered . . . . . . . . . . . . . . .   5
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Semantics and Syntax  . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Signaling Model . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Session Descriptions and State Machine  . . . . . . . . .   7
     3.3.  Session Description Format  . . . . . . . . . . . . . . .  10
     3.4.  Session Description Control . . . . . . . . . . . . . . .  10
       3.4.1.  RtpTransceivers . . . . . . . . . . . . . . . . . . .  10
       3.4.2.  RtpSenders  . . . . . . . . . . . . . . . . . . . . .  11
       3.4.3.  RtpReceivers  . . . . . . . . . . . . . . . . . . . .  11
     3.5.  ICE . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
       3.5.1.  ICE Gathering Overview  . . . . . . . . . . . . . . .  11
       3.5.2.  ICE Candidate Trickling . . . . . . . . . . . . . . .  12
         3.5.2.1.  ICE Candidate Format  . . . . . . . . . . . . . .  12
       3.5.3.  ICE Candidate Policy  . . . . . . . . . . . . . . . .  13
       3.5.4.  ICE Candidate Pool  . . . . . . . . . . . . . . . . .  14
     3.6.  Video Size Negotiation  . . . . . . . . . . . . . . . . .  14
       3.6.1.  Creating an imageattr Attribute . . . . . . . . . . .  15
       3.6.2.  Interpreting an imageattr Attribute . . . . . . . . .  16
     3.7.  Simulcast . . . . . . . . . . . . . . . . . . . . . . . .  17
     3.8.  Interactions With Forking . . . . . . . . . . . . . . . .  18
       3.8.1.  Sequential Forking  . . . . . . . . . . . . . . . . .  18
       3.8.2.  Parallel Forking  . . . . . . . . . . . . . . . . . .  19
   4.  Interface . . . . . . . . . . . . . . . . . . . . . . . . . .  20
     4.1.  Methods . . . . . . . . . . . . . . . . . . . . . . . . .  20
       4.1.1.  Constructor . . . . . . . . . . . . . . . . . . . . .  20
       4.1.2.  addTrack  . . . . . . . . . . . . . . . . . . . . . .  22
       4.1.3.  addTransceiver  . . . . . . . . . . . . . . . . . . .  22
       4.1.4.  createDataChannel . . . . . . . . . . . . . . . . . .  22
       4.1.5.  createOffer . . . . . . . . . . . . . . . . . . . . .  23
       4.1.6.  createAnswer  . . . . . . . . . . . . . . . . . . . .  24
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