WebRTC Forward Error Correction Requirements
draft-ietf-rtcweb-fec-06

Document Type Active Internet-Draft (rtcweb WG)
Last updated 2017-08-02 (latest revision 2017-07-03)
Replaces draft-uberti-rtcweb-fec
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Network Working Group                                          J. Uberti
Internet-Draft                                                    Google
Intended status: Standards Track                            July 3, 2017
Expires: January 4, 2018

              WebRTC Forward Error Correction Requirements
                        draft-ietf-rtcweb-fec-06

Abstract

   This document provides information and requirements for how Forward
   Error Correction (FEC) should be used by WebRTC implementations.

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 January 4, 2018.

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
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   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.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Types of FEC  . . . . . . . . . . . . . . . . . . . . . . . .   2
     3.1.  Separate FEC Stream . . . . . . . . . . . . . . . . . . .   3
     3.2.  Redundant Encoding  . . . . . . . . . . . . . . . . . . .   3
     3.3.  Codec-Specific In-band FEC  . . . . . . . . . . . . . . .   3
   4.  FEC for Audio Content . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Recommended Mechanism . . . . . . . . . . . . . . . . . .   4
     4.2.  Negotiating Support . . . . . . . . . . . . . . . . . . .   5
   5.  FEC for Video Content . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Recommended Mechanism . . . . . . . . . . . . . . . . . .   5
     5.2.  Negotiating Support . . . . . . . . . . . . . . . . . . .   6
   6.  FEC for Application Content . . . . . . . . . . . . . . . . .   6
   7.  Implementation Requirements . . . . . . . . . . . . . . . . .   6
   8.  Adaptive Use of FEC . . . . . . . . . . . . . . . . . . . . .   7
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     12.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Appendix A.  Change log . . . . . . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   In situations where packet loss is high, or perfect media quality is
   essential, Forward Error Correction (FEC) can be used to proactively
   recover from packet losses.  This specification provides guidance on
   which FEC mechanisms to use, and how to use them, for WebRTC
   implementations.

2.  Terminology

   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 [RFC2119].

3.  Types of FEC

   FEC describes the sending of redundant information in an outgoing
   packet stream so that information can still be recovered even in the
   face of packet loss.  There are multiple ways in which this can be
   accomplished; this section enumerates the various mechanisms and
   describes their tradeoffs.

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