Javascript Session Establishment Protocol
draft-ietf-rtcweb-jsep-16
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
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on March 24, 2017.
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Uberti, et al. Expires March 24, 2017 [Page 1]
Internet-Draft JSEP September 2016
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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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