Frame Marking RTP Header Extension
draft-ietf-avtext-framemarking-11
Network Working Group M. Zanaty
Internet-Draft E. Berger
Intended status: Standards Track S. Nandakumar
Expires: February 5, 2021 Cisco Systems
August 4, 2020
Frame Marking RTP Header Extension
draft-ietf-avtext-framemarking-11
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 decryption 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 February 5, 2021.
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Internet-Draft Frame Marking August 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Key Words for Normative Requirements . . . . . . . . . . . . 4
3. Frame Marking RTP Header Extension . . . . . . . . . . . . . 4
3.1. Long Extension for Scalable Streams . . . . . . . . . . . 4
3.2. Short Extension for Non-Scalable Streams . . . . . . . . 6
3.3. Layer ID Mappings for Scalable Streams . . . . . . . . . 7
3.3.1. H265 LID Mapping . . . . . . . . . . . . . . . . . . 7
3.3.2. H264-SVC LID Mapping . . . . . . . . . . . . . . . . 8
3.3.3. H264 (AVC) LID Mapping . . . . . . . . . . . . . . . 9
3.3.4. VP8 LID Mapping . . . . . . . . . . . . . . . . . . . 9
3.3.5. Future Codec LID Mapping . . . . . . . . . . . . . . 10
3.4. Signaling Information . . . . . . . . . . . . . . . . . . 10
3.5. Usage Considerations . . . . . . . . . . . . . . . . . . 10
3.5.1. Relation to Layer Refresh Request (LRR) . . . . . . . 10
3.5.2. Scalability Structures . . . . . . . . . . . . . . . 11
4. Security Considerations . . . . . . . . . . . . . . . . . . . 11
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 11
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1. Normative References . . . . . . . . . . . . . . . . . . 12
7.2. Informative References . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13
1. Introduction
Many widely deployed RTP [RFC3550] topologies [RFC7667] 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
[I-D.ietf-perc-private-media-framework] via end-to-end encryption
where the switch has no access to media decryption keys. 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
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