RTP Payload Format for 1-D Interleaved Parity Forward Error Correction (FEC)
RFC 6015
Internet Engineering Task Force (IETF) A. Begen
Request for Comments: 6015 Cisco
Category: Standards Track October 2010
ISSN: 2070-1721
RTP Payload Format for 1-D Interleaved Parity
Forward Error Correction (FEC)
Abstract
This document defines a new RTP payload format for the Forward Error
Correction (FEC) that is generated by the 1-D interleaved parity code
from a source media encapsulated in RTP. The 1-D interleaved parity
code is a systematic code, where a number of repair symbols are
generated from a set of source symbols and sent in a repair flow
separate from the source flow that carries the source symbols. The
1-D interleaved parity code offers a good protection against bursty
packet losses at a cost of reasonable complexity. The new payload
format defined in this document should only be used (with some
exceptions) as a part of the Digital Video Broadcasting-IPTV (DVB-
IPTV) Application-layer FEC specification.
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/rfc6015.
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RFC 6015 RTP Payload Format for Interleaved FEC October 2010
Copyright Notice
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document authors. All rights reserved.
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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RFC 6015 RTP Payload Format for Interleaved FEC October 2010
Table of Contents
1. Introduction ....................................................4
1.1. Use Cases ..................................................6
1.2. Overhead Computation .......................................8
1.3. Relation to Existing Specifications ........................8
1.3.1. RFCs 2733 and 3009 ..................................8
1.3.2. SMPTE 2022-1 ........................................8
1.3.3. ETSI TS 102 034 .....................................9
1.4. Scope of the Payload Format ...............................10
2. Requirements Notation ..........................................10
3. Definitions, Notations, and Abbreviations ......................10
3.1. Definitions ...............................................10
3.2. Notations .................................................11
4. Packet Formats .................................................11
4.1. Source Packets ............................................11
4.2. Repair Packets ............................................11
5. Payload Format Parameters ......................................15
5.1. Media Type Registration ...................................15
5.1.1. Registration of audio/1d-interleaved-parityfec .....15
5.1.2. Registration of video/1d-interleaved-parityfec .....16
5.1.3. Registration of text/1d-interleaved-parityfec ......18
5.1.4. Registration of
application/1d-interleaved-parityfec ...............19
5.2. Mapping to SDP Parameters .................................20
5.2.1. Offer-Answer Model Considerations ..................21
5.2.2. Declarative Considerations .........................22
6. Protection and Recovery Procedures .............................22
6.1. Overview ..................................................22
6.2. Repair Packet Construction ................................22
6.3. Source Packet Reconstruction ..............................24
6.3.1. Associating the Source and Repair Packets ..........25
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