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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