RTP Payload Format Restrictions
draft-ietf-mmusic-rid-15

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Network Working Group                                  A. Roach (Editor)
Internet-Draft                                                   Mozilla
Updates: 4855 (if approved)                                 May 15, 2018
Intended status: Standards Track
Expires: November 16, 2018

                    RTP Payload Format Restrictions
                        draft-ietf-mmusic-rid-15

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" ("restriction identifier") SDP
   attribute to unambiguously identify the RTP Streams within an 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 November 16, 2018.

Copyright Notice

   Copyright (c) 2018 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

Roach (Editor)          Expires November 16, 2018               [Page 1]
Internet-Draft              RTP Restrictions                    May 2018

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   publication of this document.  Please review these documents
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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 . . . . . . . . . . . . . . . . .   8
     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 . . . . . . . . . . . . . . . . . .  13
   7.  Use with Declarative SDP  . . . . . . . . . . . . . . . . . .  13
   8.  Interaction with Other Techniques . . . . . . . . . . . . . .  13
     8.1.  Interaction with VP8 Format Parameters  . . . . . . . . .  14
       8.1.1.  max-fr - Maximum Framerate  . . . . . . . . . . . . .  14
       8.1.2.  max-fs - Maximum Framesize, in VP8 Macroblocks  . . .  14
     8.2.  Interaction with H.264 Format Parameters  . . . . . . . .  15
       8.2.1.  profile-level-id and max-recv-level - Negotiated Sub-
               Profile . . . . . . . . . . . . . . . . . . . . . . .  16
       8.2.2.  max-br / MaxBR - Maximum Video Bitrate  . . . . . . .  16
       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  . . . . .  17
     8.3.  Redundancy Formats and Payload Type Restrictions  . . . .  17
   9.  Format Parameters for Future Payloads . . . . . . . . . . . .  18
   10. Formal Grammar  . . . . . . . . . . . . . . . . . . . . . . .  18
   11. SDP Examples  . . . . . . . . . . . . . . . . . . . . . . . .  20
     11.1.  Many Bundled Streams using Many Codecs . . . . . . . . .  20
     11.2.  Scalable Layers  . . . . . . . . . . . . . . . . . . . .  22
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22