The Layer Refresh Request (LRR) RTCP Feedback Message
draft-ietf-avtext-lrr-07
Payload Working Group J. Lennox
Internet-Draft D. Hong
Intended status: Standards Track Vidyo
Expires: December 31, 2017 J. Uberti
S. Holmer
M. Flodman
Google
June 29, 2017
The Layer Refresh Request (LRR) RTCP Feedback Message
draft-ietf-avtext-lrr-07
Abstract
This memo describes the RTCP Payload-Specific Feedback Message "Layer
Refresh Request" (LRR), which can be used to request a state refresh
of one or more substreams of a layered media stream. It also defines
its use with several RTP payloads for scalable media formats.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on December 31, 2017.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions, Definitions and Acronyms . . . . . . . . . . . . 2
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
3. Layer Refresh Request . . . . . . . . . . . . . . . . . . . . 5
3.1. Message Format . . . . . . . . . . . . . . . . . . . . . 6
3.2. Semantics . . . . . . . . . . . . . . . . . . . . . . . . 7
4. Usage with specific codecs . . . . . . . . . . . . . . . . . 8
4.1. H264 SVC . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2. VP8 . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3. H265 . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5. Usage with different scalability transmission mechanisms . . 11
6. SDP Definitions . . . . . . . . . . . . . . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.1. Normative References . . . . . . . . . . . . . . . . . . 12
9.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
This memo describes an RTCP [RFC3550] Payload-Specific Feedback
Message [RFC4585] "Layer Refresh Request" (LRR). It is designed to
allow a receiver of a layered media stream to request that one or
more of its substreams be refreshed, such that it can then be decoded
by an endpoint which previously was not receiving those layers,
without requiring that the entire stream be refreshed (as it would be
if the receiver sent a Full Intra Request (FIR); [RFC5104] see also
[RFC8082]).
The feedback message is applicable both to temporally and spatially
scaled streams, and to both single-stream and multi-stream
scalability modes.
2. Conventions, Definitions and Acronyms
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
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2.1. Terminology
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