SDP Superimposition Grouping framework
draft-abhishek-mmusic-superimposition-grouping-00
mmusic R. Abhishek
Internet-Draft S. Wenger
Intended status: Standards Track Tencent
Expires: June 14, 2021 December 11, 2020
SDP Superimposition Grouping framework
draft-abhishek-mmusic-superimposition-grouping-00
Abstract
This document defines semantics that allow for signaling a new SDP
group "S" for superimposed media in an SDP session. The "S"
attribute can be used by the application to relate all the
superimposed media streams enabling them to be added as an overlay on
top of any media stream. The superimposition grouping semantics is
required, if the media data is separate and transported via different
sessions.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Superimposition Group Identification Attribute . . . . . . . 4
4. Use of group and mid . . . . . . . . . . . . . . . . . . . . 4
5. "transparency" Attribute for Superimposition Group
Identification Attribute . . . . . . . . . . . . . . . . . . 5
6. Example of S . . . . . . . . . . . . . . . . . . . . . . . . 5
7. Relationship with CLUE (informative) . . . . . . . . . . . . 6
8. Security Considerations . . . . . . . . . . . . . . . . . . . 6
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
10.1. Normative References . . . . . . . . . . . . . . . . . . 8
10.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
Media superimposition can be defined to be a visual media
(video/image/text) which is superimposed on top of an already
existing visual media such that the resulting foreground and
background media can be displayed simultaneously. Superimposition
can be recursive in that a visual media that is superimposed against
its background can, in turn, be the background of a another
superimposed visual media. The superimposed visual media displayed
over a background media content may vary in transparency. Examples
of video superimposition include real-time multi-party gaming, where
these superimposed media maybe used to provide additional details or
stats about each player, or multi-party teleconferencing where visual
media from users in the teleconference may be superimposed on a
background media or over each other. An example is shown in figure
below, where three foreground media has been superimposed over a
background media with one foreground media being partly superimposed
over another foreground media.
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----------------------------
| Background media |
| _________ |
| | Media A | |
| |_________| |
| __________ |
| ______|__ Media B| |
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