The Layer Refresh Request (LRR) RTCP Feedback Message
draft-ietf-avtext-lrr-07

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Payload Working Group                                          J. Lennox
Internet-Draft                                                   D. Hong
Intended status: Standards Track                                   Vidyo
Expires: December 31, 2017                                     J. Uberti
                                                               S. Holmer
                                                              M. Flodman
                                                                  Google
                                                           June 29, 2017

         The Layer Refresh Request (LRR) RTCP Feedback Message
                        draft-ietf-avtext-lrr-07

Abstract

   This memo describes the RTCP Payload-Specific Feedback Message "Layer
   Refresh Request" (LRR), which can be used to request a state refresh
   of one or more substreams of a layered media stream.  It also defines
   its use with several RTP payloads for scalable media formats.

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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 31, 2017.

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
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   to this document.  Code Components extracted from this document must

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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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions, Definitions and Acronyms . . . . . . . . . . . .   2
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Layer Refresh Request . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Message Format  . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Semantics . . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Usage with specific codecs  . . . . . . . . . . . . . . . . .   8
     4.1.  H264 SVC  . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  VP8 . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.3.  H265  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
   5.  Usage with different scalability transmission mechanisms  . .  11
   6.  SDP Definitions . . . . . . . . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   This memo describes an RTCP [RFC3550] Payload-Specific Feedback
   Message [RFC4585] "Layer Refresh Request" (LRR).  It is designed to
   allow a receiver of a layered media stream to request that one or
   more of its substreams be refreshed, such that it can then be decoded
   by an endpoint which previously was not receiving those layers,
   without requiring that the entire stream be refreshed (as it would be
   if the receiver sent a Full Intra Request (FIR); [RFC5104] see also
   [RFC8082]).

   The feedback message is applicable both to temporally and spatially
   scaled streams, and to both single-stream and multi-stream
   scalability modes.

2.  Conventions, Definitions and Acronyms

   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].

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2.1.  Terminology