RTP Payload Format for Raptor Forward Error Correction (FEC)
RFC 6682

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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

   Copyright (c) 2012 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
   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