RTP Payload Format for Raptor Forward Error Correction (FEC)
RFC 6682
Internet Engineering Task Force (IETF) M. Watson
Request for Comments: 6682 Netflix
Category: Standards Track T. Stockhammer
ISSN: 2070-1721 Nomor Research
M. Luby
Qualcomm Incorporated
August 2012
RTP Payload Format for Raptor Forward Error Correction (FEC)
Abstract
This document specifies an RTP payload format for the Forward Error
Correction (FEC) repair data produced by the Raptor FEC Schemes.
Raptor FEC Schemes are specified for use with the IETF FEC Framework
that supports the transport of repair data over both UDP and RTP.
This document specifies the payload format that is required for the
use of RTP to carry Raptor repair flows.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by
the Internet Engineering Steering Group (IESG). Further
information on Internet Standards is available in Section 2 of
RFC 5741.
Information about the current status of this document, any
errata, and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6682.
Watson, et al. Standards Track [Page 1]
RFC 6682 RTP Payload Format for Raptor August 2012
Copyright Notice
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document authors. All rights reserved.
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Table of Contents
1. Introduction ....................................................3
2. Conventions, Definitions, and Acronyms ..........................3
3. Media Format Background .........................................3
4. Payload Format for FEC Repair Packets ...........................4
4.1. RTP Header Usage ...........................................4
4.2. Payload Header .............................................5
4.3. Payload Data ...............................................5
5. Congestion Control Considerations ...............................5
6. Media Types .....................................................5
6.1. Registration of the 'application/raptorfec' Media Type .....5
6.1.1. Media Type Definition ...............................5
6.2. Registration of the 'video/raptorfec' Media Type ...........7
6.2.1. Media Type Definition ...............................7
6.3. Registration of the 'audio/raptorfec' Media Type ...........8
6.3.1. Media Type Definition ...............................8
6.4. Registration of the 'text/raptorfec' Media Type ...........10
6.4.1. Media Type Definition ..............................10
7. Mapping to the Session Description Protocol (SDP) ..............12
8. Offer/Answer Considerations ....................................12
9. Declarative SDP Considerations .................................13
10. Repair Flow Generation and Recovery Procedures ................13
10.1. Overview .................................................13
10.2. Repair Packet Construction ...............................14
10.3. Usage of RTCP ............................................14
10.4. Source Packet Reconstruction .............................14
11. Session Description Protocol (SDP) Example ....................14
12. IANA Considerations ...........................................15
13. Security Considerations .......................................15
14. References ....................................................16
14.1. Normative References .....................................16
14.2. Informative References ...................................17
Watson, et al. Standards Track [Page 2]
RFC 6682 RTP Payload Format for Raptor August 2012
1. Introduction
The FEC Framework [RFC6363] defines a general framework for the use
of Forward Error Correction in association with arbitrary packet
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