Generic Application Programming Interface (API) for Sliding Window FEC Codes
draft-roca-nwcrg-generic-fec-api-04

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NWCRG                                                      V. Roca (Ed.)
Internet-Draft                                                     INRIA
Intended status: Informational                               J. Detchart
Expires: May 8, 2019                                      ISAE - Supaero
                                                                C. Adjih
                                                                   INRIA
                                                             M. Pedersen
                                                           Steinwurf ApS
                                                        November 4, 2018

 Generic Application Programming Interface (API) for Sliding Window FEC
                                 Codes
                  draft-roca-nwcrg-generic-fec-api-04

Abstract

   This document introduces a generic Application Programming Interface
   (API) for sliding window FEC codes.  This API is meant to be
   compatible with any sliding window FEC code.  It defines the core
   procedures and functions meant to control the codec (i.e.,
   implementation of the FEC code).  However, it leaves out all upper
   layer aspects that are the responsibility of the application or
   protocol making use of the codec.  As a consequence, this is not an
   API for a FEC Scheme since certain mechanisms that must be defined by
   any FEC Scheme (e.g., signalling and FEC Payload IDs) are the
   responsibility of the caller instead of being addressed by the codec.
   A first goal of this document is to pave the way for a future open-
   source implementation of such codes, another goal is to simplify the
   development of content delivery protocols that rely on sliding window
   FEC codes for robust transmissions.

Status of This Memo

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   This Internet-Draft will expire on May 8, 2019.

Roca (Ed.), et al.         Expires May 8, 2019                  [Page 1]
Internet-Draft                 Generic API                 November 2018

Copyright Notice

   Copyright (c) 2018 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions and Abbreviations . . . . . . . . . . . . . . . .   3
   3.  AL-FEC Codes and Mechanisms Considered by the Generic API . .   3
     3.1.  Mechanisms Considered or Ignored by the API . . . . . . .   5
   4.  Generic API for Sliding Window FEC Codes  . . . . . . . . . .   6
     4.1.  General Definitions Common to the Encoder and Decoder . .   6
     4.2.  Encoder . . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.3.  Decoder . . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.4.  Coding Window Functions at an Encoder and Decoder . . . .  17
     4.5.  Coding Coefficients Functions at an Encoder and Decoder .  18
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  22
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  22
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  22
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  22
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  22

1.  Introduction

   Forward Erasure Correction (FEC) codes are a key element of
   communication systems, used to efficiently recover from packet losses
   during content delivery sessions.  Among the FEC codes working at the
   network and higher layers, one can broadly distinguish block codes
   and sliding window codes.  Block FEC codes require the data flow
   coming from the application to be segmented into blocks of a
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