Using Codec Control Messages in the RTP Audio-Visual Profile with Feedback with Layered Codecs
RFC 8082

Document Type RFC - Proposed Standard (March 2017; No errata)
Updates RFC 5104
Last updated 2017-03-09
Replaces draft-wenger-avtext-avpf-ccm-layered
Stream IETF
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Stream WG state Submitted to IESG for Publication (wg milestone: Dec 2016 - Submit Update to Cod... )
Document shepherd Rachel Huang
Shepherd write-up Show (last changed 2016-09-30)
IESG IESG state RFC 8082 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Ben Campbell
Send notices to "Rachel Huang" <rachel.huang@huawei.com>
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                         S. Wenger
Request for Comments: 8082                                     J. Lennox
Updates: 5104                                                Vidyo, Inc.
Category: Standards Track                                      B. Burman
ISSN: 2070-1721                                            M. Westerlund
                                                                Ericsson
                                                              March 2017

   Using Codec Control Messages in the RTP Audio-Visual Profile with
                      Feedback with Layered Codecs

Abstract

   This document updates RFC 5104 by fixing a shortcoming in the
   specification language of the Codec Control Message Full Intra
   Request (FIR) description when using it with layered codecs.  In
   particular, a decoder refresh point needs to be sent by a media
   sender when a FIR is received on any layer of the layered bitstream,
   regardless of whether those layers are being sent in a single or in
   multiple RTP flows.  The other payload-specific feedback messages
   defined in RFC 5104 and RFC 4585 (which was updated by RFC 5506) have
   also been analyzed, and no corresponding shortcomings have been
   found.

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 7841.

   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/rfc8082.

Wenger, et al.               Standards Track                    [Page 1]
RFC 8082                 CCM for Layered Codecs               March 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
   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 and Problem Statement  . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  Updated Definition of Decoder Refresh Point . . . . . . . . .   4
   4.  Full Intra Request for Layered Codecs . . . . . . . . . . . .   5
   5.  Identifying the Use of Layered Bitstreams (Informative) . . .   6
   6.  Layered Codecs and Non-FIR Codec Control Messages
       (Informative) . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Picture Loss Indication (PLI) . . . . . . . . . . . . . .   7
     6.2.  Slice Loss Indication (SLI) . . . . . . . . . . . . . . .   7
     6.3.  Reference Picture Selection Indication (RPSI) . . . . . .   7
     6.4.  Temporal-Spatial Trade-Off Request and Notification
           (TSTR/TSTN) . . . . . . . . . . . . . . . . . . . . . . .   8
     6.5.  H.271 Video Back Channel Message (VBCM) . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

Wenger, et al.               Standards Track                    [Page 2]
RFC 8082                 CCM for Layered Codecs               March 2017

1.  Introduction and Problem Statement

   The "Extended RTP Profile for Real-time Transport Control Protocol
   (RTCP)-Based Feedback (RTP/AVPF)" [RFC4585] and "Codec Control
   Messages in the RTP Audio-Visual Profile with Feedback (AVPF)"
   [RFC5104] specify a number of payload-specific feedback messages that
   a media receiver can use to inform a media sender of certain
   conditions or to make certain requests.  The feedback messages are
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