The Layer Refresh Request (LRR) RTCP Feedback Message
draft-ietf-avtext-lrr-07
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2017-07-11
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draft-lennox-avtext-lrr
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MISSREF |
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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on December 31, 2017.
Copyright Notice
Copyright (c) 2017 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
Lennox, et al. Expires December 31, 2017 [Page 1]
Internet-Draft Layer Refresh Request RTCP Feedback June 2017
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. 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
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