Frame Marking RTP Header Extension
draft-ietf-avtext-framemarking-00

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Last updated 2015-10-20 (latest revision 2015-10-19)
Replaces draft-berger-avtext-framemarking
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Network Working Group                                          E. Berger
Internet-Draft                                             S. Nandakumar
Intended status: Standards Track                               M. Zanaty
Expires: April 21, 2016                                    Cisco Systems
                                                        October 19, 2015

                   Frame Marking RTP Header Extension
                   draft-ietf-avtext-framemarking-00

Abstract

   This document describes a Frame Marking RTP header extension used to
   convey information about video frames that is critical for error
   recovery and packet forwarding in RTP middleboxes or network nodes.
   It is most useful when media is encrypted, and essential when the
   middlebox or node has no access to the media encryption keys.  It is
   also useful for codec-agnostic processing of encrypted or unencrypted
   media, while it also supports extensions for codec-specific
   information.

Status of This Memo

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   This Internet-Draft will expire on April 21, 2016.

Copyright Notice

   Copyright (c) 2015 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

Berger, et al.           Expires April 21, 2016                 [Page 1]
Internet-Draft                Frame Marking                 October 2015

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Solution  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Mandatory Extension . . . . . . . . . . . . . . . . . . .   4
     2.2.  Layer ID Mappings . . . . . . . . . . . . . . . . . . . .   4
       2.2.1.  H265 LID Mapping  . . . . . . . . . . . . . . . . . .   4
       2.2.2.  VP9 LID Mapping . . . . . . . . . . . . . . . . . . .   5
       2.2.3.  VP8 LID Mapping . . . . . . . . . . . . . . . . . . .   5
       2.2.4.  H264-SVC LID Mapping  . . . . . . . . . . . . . . . .   5
       2.2.5.  H264 (AVC) LID Mapping  . . . . . . . . . . . . . . .   5
     2.3.  Signaling information . . . . . . . . . . . . . . . . . .   6
     2.4.  Considerations on use . . . . . . . . . . . . . . . . . .   6
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Many widely deployed RTP topologies used in modern voice and video
   conferencing systems include a centralized component that acts as an
   RTP switch.  It receives voice and video streams from each
   participant, which may be encrypted using SRTP [RFC3711], or
   extensions that provide participants with private media via end-to-
   end encryption that excludes the switch.  The goal is to provide a
   set of streams back to the participants which enable them to render
   the right media content.  In a simple video configuration, for
   example, the goal will be that each participant sees and hears just
   the active speaker.  In that case, the goal of the switch is to
   receive the voice and video streams from each participant, determine
   the active speaker based on energy in the voice packets, possibly
   using the client-to-mixer audio level RTP header extension, and
   select the corresponding video stream for transmission to
   participants; see Figure 1.

   In this document, an "RTP switch" is used as a common short term for
   the terms "switching RTP mixer", "source projecting middlebox",
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