SDP Superimposition Grouping framework
draft-abhishek-mmusic-superimposition-grouping-01

Document Type Active Internet-Draft (individual)
Authors Rohit Abhishek  , Stephan Wenger 
Last updated 2021-02-01
Replaces draft-abhishek-mmusic-overlay-grouping
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mmusic                                                       R. Abhishek
Internet-Draft                                                 S. Wenger
Intended status: Standards Track                                 Tencent
Expires: August 5, 2021                                 February 1, 2021

                 SDP Superimposition Grouping framework
           draft-abhishek-mmusic-superimposition-grouping-01

Abstract

   This document defines semantics that allow for signaling a new SDP
   group "supim" for superimposed media in an SDP session.  The "supim"
   attribute can be used by the application to relate all the
   superimposed visual media streams enabling them to be added as an
   overlay on top of any visual media stream.  The superimposition
   grouping semantics is helpful, if the media data is separate and
   transported via different sessions.

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   Copyright (c) 2021 IETF Trust and the persons identified as the
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   the Trust Legal Provisions and are provided without warranty as
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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  . . . . . . . . . . . . . . . . . . . .   5
   5.  "superposition" Attribute for Superimposition Group
       Identification Attribute  . . . . . . . . . . . . . . . . . .   5
   6.  Example of Supim  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Relationship with CLUE (informative)  . . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     11.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Media superimposition herein is 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 visual media that is superimposed against
   its background can, in turn, be the background of another
   superimposed visual media.  The superimposed visual media displayed
   over a background media content may be anywhere between opaque and
   transparent.  Examples of applications for 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 the figure below, where three
   foreground media have 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 |               |
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