CLUE WG R. Even
Internet-Draft Huawei Technologies
Intended status: Standards Track J. Lennox
Expires: August 5, 2013 Vidyo
February 1, 2013
Mapping RTP streams to CLUE media captures
draft-even-clue-rtp-mapping-05.txt
Abstract
This document describes mechanisms and recommended practice for
mapping RTP media streams defined in SDP to CLUE media captures.
Status of this Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. RTP topologies for CLUE . . . . . . . . . . . . . . . . . . . 3
4. Mapping CLUE Media Captures to RTP streams . . . . . . . . . . 5
4.1. Review of current directions in MMUSIC, AVText and
AVTcore . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2. Requirements of a solution . . . . . . . . . . . . . . . . 7
4.3. Static Mapping . . . . . . . . . . . . . . . . . . . . . . 9
4.4. Dynamic mapping . . . . . . . . . . . . . . . . . . . . . 9
4.4.1. RTP header extension . . . . . . . . . . . . . . . . . 10
4.4.2. Restricted approach . . . . . . . . . . . . . . . . . 10
4.5. Recommendations . . . . . . . . . . . . . . . . . . . . . 11
5. Application to CLUE Media Requirements . . . . . . . . . . . . 11
6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1. Static mapping . . . . . . . . . . . . . . . . . . . . . . 13
6.2. Dynamic Mapping . . . . . . . . . . . . . . . . . . . . . 16
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16
9. Security Considerations . . . . . . . . . . . . . . . . . . . 17
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
10.1. Normative References . . . . . . . . . . . . . . . . . . . 17
10.2. Informative References . . . . . . . . . . . . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19
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1. Introduction
Telepresence systems can send and receive multiple media streams.
The CLUE framework [I-D.ietf-clue-framework] defines media captures
as a source of Media, such as from one or more Capture Devices. A
Media Capture (MC) may be the source of one or more Media streams. A
Media Capture may also be constructed from other Media streams. A
middle box can express Media Captures that it constructs from Media
streams it receives.
SIP offer answer [RFC3264] uses SDP [RFC4566] to describe the
RTP[RFC3550] media streams. Each RTP stream has a unique SSRC within
its RTP session. The content of the RTP stream is created by an
encoder in the endpoint. This may be an original content from a
datatracker.ietf.org