SDP Superimposition Grouping framework
draft-abhishek-mmusic-superimposition-grouping-00

Document Type Active Internet-Draft (individual)
Authors Rohit Abhishek  , Stephan Wenger 
Last updated 2020-12-11
Replaces draft-abhishek-mmusic-overlay-grouping
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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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   Copyright (c) 2020 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  . . . . . . . . . . . . . . . . . . . .   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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