SDP Overlay Grouping framework for immersive telepresence media streams
draft-abhishek-mmusic-overlay-grouping-00

Document Type Active Internet-Draft (individual)
Author Rohit Abhishek 
Last updated 2020-10-27
Replaces draft-overlay-grouping
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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.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on April 30, 2021.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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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.  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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