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RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Concealment Metrics Reporting on Audio Applications
RFC 7294

Internet Engineering Task Force (IETF)                          A. Clark
Request for Comments: 7294                                      Telchemy
Category: Standards Track                                        G. Zorn
ISSN: 2070-1721                                              Network Zen
                                                                   C. Bi
                                                                   STTRI
                                                                   Q. Wu
                                                                  Huawei
                                                               July 2014

        RTP Control Protocol (RTCP) Extended Report (XR) Blocks
        for Concealment Metrics Reporting on Audio Applications

Abstract

   This document defines two RTP Control Protocol (RTCP) Extended Report
   (XR) blocks that allow the reporting of concealment metrics for audio
   applications of RTP.

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/rfc7294.

Copyright Notice

   Copyright (c) 2014 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.

Clark, et al.                Standards Track                    [Page 1]
RFC 7294                   RTCP XR Concealment                 July 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Loss Concealment and Concealed Seconds Metrics
           Blocks  . . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  RTCP and RTCP Extended Reports  . . . . . . . . . . . . .   3
     1.3.  Performance Metrics Framework . . . . . . . . . . . . . .   4
     1.4.  Applicability . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Standards Language  . . . . . . . . . . . . . . . . . . .   4
     2.2.  Notations . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Loss Concealment Metrics Block  . . . . . . . . . . . . . . .   5
     3.1.  Report Block Structure  . . . . . . . . . . . . . . . . .   5
     3.2.  Definition of Fields in Loss Concealment Metrics Block  .   5
   4.  Concealed Seconds Metrics Block . . . . . . . . . . . . . . .   9
     4.1.  Report Block Structure  . . . . . . . . . . . . . . . . .  10
     4.2.  Definition of Fields in Concealed Seconds Metrics Block .  10
   5.  SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . .  14
     5.1.  SDP rtcp-xr-attrib Attribute Extension  . . . . . . . . .  14
     5.2.  Offer/Answer Usage  . . . . . . . . . . . . . . . . . . .  14
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
     6.1.  New RTCP XR Block Type Values . . . . . . . . . . . . . .  14
     6.2.  New RTCP XR SDP Parameters  . . . . . . . . . . . . . . .  15
     6.3.  Contact Information for Registrations . . . . . . . . . .  15
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  15
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     10.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Appendix A.  Metrics Represented Using the Template from RFC 6390  17

1.  Introduction

1.1.  Loss Concealment and Concealed Seconds Metrics Blocks

   At any instant, the audio output at a receiver may be classified as
   either 'normal' or 'concealed'.  'Normal' refers to playout of audio
   payload received from the remote end and also includes locally

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