RTP Payload Format Restrictions
draft-ietf-mmusic-rid-12

Document Type Active Internet-Draft (mmusic WG)
Last updated 2017-11-15 (latest revision 2017-11-13)
Replaces draft-pthatcher-mmusic-rid
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication (wg milestone: Aug 2017 - Submit RTP Payload F... )
Document shepherd Flemming Andreasen
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Send notices to "Flemming Andreasen" <fandreas@cisco.com>
Network Working Group                                  A. Roach (Editor)
Internet-Draft                                                   Mozilla
Updates: 4855 (if approved)                            November 13, 2017
Intended status: Standards Track
Expires: May 17, 2018

                    RTP Payload Format Restrictions
                        draft-ietf-mmusic-rid-12

Abstract

   In this specification, we define a framework for specifying
   restrictions on RTP streams in the Session Description Protocol.
   This framework defines a new "rid" SDP attribute to unambiguously
   identify the RTP Streams within a RTP Session and restrict the
   streams' payload format parameters in a codec-agnostic way beyond
   what is provided with the regular Payload Types.

   This specification updates RFC4855 to give additional guidance on
   choice of Format Parameter (fmtp) names, and on their relation to the
   restrictions defined by this document.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on May 17, 2018.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

Roach (Editor)            Expires May 17, 2018                  [Page 1]
Internet-Draft              RTP Restrictions               November 2017

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Key Words for Requirements  . . . . . . . . . . . . . . . . .   4
   4.  SDP "a=rid" Media Level Attribute . . . . . . . . . . . . . .   4
   5.  "a=rid" restrictions  . . . . . . . . . . . . . . . . . . . .   6
   6.  SDP Offer/Answer Procedures . . . . . . . . . . . . . . . . .   7
     6.1.  Generating the Initial SDP Offer  . . . . . . . . . . . .   8
     6.2.  Answerer processing the SDP Offer . . . . . . . . . . . .   9
       6.2.1.  "a=rid"-unaware Answerer  . . . . . . . . . . . . . .   9
       6.2.2.  "a=rid"-aware Answerer  . . . . . . . . . . . . . . .   9
     6.3.  Generating the SDP Answer . . . . . . . . . . . . . . . .  10
     6.4.  Offerer Processing of the SDP Answer  . . . . . . . . . .  11
     6.5.  Modifying the Session . . . . . . . . . . . . . . . . . .  12
   7.  Use with Declarative SDP  . . . . . . . . . . . . . . . . . .  12
   8.  Interaction with Other Techniques . . . . . . . . . . . . . .  12
     8.1.  Interaction with VP8 Format Parameters  . . . . . . . . .  13
       8.1.1.  max-fr - Maximum Framerate  . . . . . . . . . . . . .  13
       8.1.2.  max-fs - Maximum Framesize, in VP8 Macroblocks  . . .  13
     8.2.  Interaction with H.264 Format Parameters  . . . . . . . .  14
       8.2.1.  profile-level-id and max-recv-level - Negotiated Sub-
               Profile . . . . . . . . . . . . . . . . . . . . . . .  15
       8.2.2.  max-br / MaxBR - Maximum Video Bitrate  . . . . . . .  15
       8.2.3.  max-fs / MaxFS - Maximum Framesize, in H.264
               Macroblocks . . . . . . . . . . . . . . . . . . . . .  16
       8.2.4.  max-mbps / MaxMBPS - Maximum Macroblock Processing
               Rate  . . . . . . . . . . . . . . . . . . . . . . . .  16
       8.2.5.  max-smbps - Maximum Decoded Picture Buffer  . . . . .  16
   9.  Format Parameters for Future Payloads . . . . . . . . . . . .  16
   10. Formal Grammar  . . . . . . . . . . . . . . . . . . . . . . .  17
   11. SDP Examples  . . . . . . . . . . . . . . . . . . . . . . . .  18
     11.1.  Many Bundled Streams using Many Codecs . . . . . . . . .  18
     11.2.  Scalable Layers  . . . . . . . . . . . . . . . . . . . .  20
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