SDP Overlay Grouping framework for immersive telepresence media streams
draft-abhishek-mmusic-overlay-grouping-00
mmusic R. Abhishek
Internet-Draft Tencent
Intended status: Standards Track October 27, 2020
Expires: April 30, 2021
SDP Overlay Grouping framework for immersive telepresence media streams
draft-abhishek-mmusic-overlay-grouping-00
Abstract
This document defines semantics that allow for signalling a new SDP
group "OL" for overlays in an immersive telepresence session. The
"OL" attribute can be used by the application to relate all the
overlay media streams enabling them to be added as overlay on top of
the immersive video. The overlay grouping semantics is required, if
the media data is seperate and transported via different protocols.
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Internet-Draft Overlay Group Semantic October 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Contribution and Discussion Venues for this draft . . . . . . 3
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Overview of Operation . . . . . . . . . . . . . . . . . . . . 3
5. Overlay Stream Group Identification Attribute . . . . . . . . 4
6. Use of group and mid . . . . . . . . . . . . . . . . . . . . 4
7. Example of OL . . . . . . . . . . . . . . . . . . . . . . . . 5
8. Security Considerations . . . . . . . . . . . . . . . . . . . 5
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
10.1. Normative References . . . . . . . . . . . . . . . . . . 7
10.2. Informative References . . . . . . . . . . . . . . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
Telepresence [RFC7205] can be described as a technology that allows a
person the experience of "being present" at a remote location for
video as well as audio telepresence sessions, so as to enable the
users sense of realism and presence [TS26.223] . SDP [RFC4566] is
being predominantly used for describing the format for multimedia
communication session for telepresence conferencing. These use open
standards such as RTP [RFC3550] and SIP [RFC3261] .
An SDP session may contain more than one media lines with each media
line identified by "m"=line. Each line denotes a single media
stream. If multiple media lines are present in a session, a receiver
needs to identify relationship between those media lines.
Overlay media stream can be defined as a piece of visual media which
can be rendered over an immersive video or image or over a viewport
[ISO23090] . When an overlay is transmitted, its media stream needs
to be uniquely identified across multiple SDP descriptions exchanged
with different receivers so that the streams can be identified in
terms of its role in the session irrespective of its media type and
transport protocol.
In an immersive telepresence session, one media is streamed as an
immersive stream whereas other media streams are overlaid on top of
the immersive video/image. An end user can stream more than one
overlay, subject to its decoding capacity. When multiple overlay
streams are transmitted within a session, the end application upon
receiving, needs to be able to relate the media streams to each
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