Closing the RTP Payload Format Media Types IANA Registry
draft-ietf-avtcore-rtp-payload-registry-04

AVTCORE                                                    M. Westerlund
Internet-Draft                                                  Ericsson
Updates: 8088 (if approved)                               7 October 2024
Intended status: Standards Track                                        
Expires: 10 April 2025

        Closing the RTP Payload Format Media Types IANA Registry
               draft-ietf-avtcore-rtp-payload-registry-04

Abstract

   It has been observed that specifications of new Real-time Transport
   Protocol (RTP) payload formats often forget to specify registration
   of the format's media type in the IANA registry "RTP Payload Formats
   Media Types" as recommended by RFC 8088.  In practice this has no
   real impact.  One reason is that the Media Types registry is the
   crucial registry to register any Media Type to establish the media
   type used to identified the format in various signaling usage.

   This document resolves the situation by first updating the RTP
   Payload Format Media Type registry to include all the known RTP
   payload formats at the time of writing, then it closes this IANA
   Registry for any future registration.  Beyond instructing IANA to
   close this registry, the instructions to authors in RFC 8088 are
   updated to reflect this.

About This Document

   This note is to be removed before publishing as an RFC.

   Status information for this document may be found at
   https://datatracker.ietf.org/doc/draft-ietf-avtcore-rtp-payload-
   registry/.

   Discussion of this document takes place on the AVTCORE Working Group
   mailing list (mailto:avt@ietf.org), which is archived at
   https://mailarchive.ietf.org/arch/browse/avt/.  Subscribe at
   https://www.ietf.org/mailman/listinfo/avt/.

   Source for this draft and an issue tracker can be found at
   https://github.com/gloinul/draft-ietf-avtcore-rtp-payload-registry.

Status of This Memo

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

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Update to How To Write an RTP Payload Format  . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   It has been observed that specifications of new Real-time Transport
   Protocol (RTP) payload formats often forget to specify registration
   of the format's media type in the IANA registry "RTP Payload Formats
   Media Types" [RTP-FORMATS] as recommended by [RFC8088].  In practice
   this has no real impact.  This registry is not used for any purpose
   other than to track which media types actually have RTP payload
   formats.  That purpose could be addressed through other means.

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   The Media Types registry [MEDIA-TYPES] is the crucial registry to
   register any Media Type to establish the media type used to identify
   the format in various signalling usages, to avoid collisions, and to
   reference their specifications.

   To resolve this situation, this document performs the following
   actions.  First, it updates the registry to include known RTP payload
   formats at the time of writing.  Then, it closes the IANA Registry
   for RTP Payload Formats Media Types for future registration.  Beyond
   instructing IANA to close this registry, the instructions to authors
   in [RFC8088] are updated so that registration in the closed registry
   is no longer mentioned.

   It is unclear how the "RTP Payload formats Media Types" [RTP-FORMATS]
   registry came into existence.  The registry references [RFC4855] as
   the instructions for this registry.  However, reviewing that RFC we
   have been unable to find any text that defines its purpose and rules.
   Further attempts to find how the registry was created have failed to
   find any reference to its creation.  It is likely this was created
   based on email or AD request.  Thus, there is no known existing
   specification for this registry that needs to be updated when closing
   the registry.

2.  Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Update to How To Write an RTP Payload Format

   How to write an RTP Payload format [RFC8088] mandates in its section
   on IANA Considerations (Section 7.4) that RTP Payload formats shall
   register in RTP Payload Format media types:

   "Since all RTP payload formats contain a media type specification,
   they also need an IANA Considerations section.  The media type name
   must be registered, and this is done by requesting that IANA register
   that media name.  When that registration request is written, it shall
   also be requested that the media type is included under the "RTP
   Payload Format media types" sub-registry of the RTP registry
   (http://www.iana.org/assignments/rtp-parameters)."

   This paragraph is changed to the following:

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   "Since all RTP payload formats contain a media type specification,
   they also need an IANA Considerations section.  The media type name
   must be registered, and this is done by requesting that IANA register
   that media name in the Media Types registry
   (https://www.iana.org/assignments/media-types/media-types.xhtml)."

   Thus removing the need to register in the "RTP Payload Format media
   types".

4.  IANA Considerations

   IANA is requested to add the following missing RTP Payload types to
   the "RTP Payload Format Media Types" registry [RTP-FORMATS].

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   +=============+==========+===========+==========+==================+
   | Media Type  | Sub Type | Clock     | Channels | Reference        |
   |             |          | Rate (Hz) | (audio)  |                  |
   +=============+==========+===========+==========+==================+
   | application | flexfec  |           |          | RFC8627          |
   +-------------+----------+-----------+----------+------------------+
   | audio       | EVRCNW   | 16000     |          | RFC6884          |
   +-------------+----------+-----------+----------+------------------+
   | audio       | EVRCNW0  | 16000     |          | RFC6884          |
   +-------------+----------+-----------+----------+------------------+
   | audio       | EVRCNW1  | 16000     |          | RFC6884          |
   +-------------+----------+-----------+----------+------------------+
   | audio       | aptx     |           |          | RFC7310          |
   +-------------+----------+-----------+----------+------------------+
   | audio       | opus     | 48000     |          | RFC7587          |
   +-------------+----------+-----------+----------+------------------+
   | audio       | G711-0   |           |          | RFC7650          |
   +-------------+----------+-----------+----------+------------------+
   | audio       | flexfec  |           |          | RFC8627          |
   +-------------+----------+-----------+----------+------------------+
   | text        | flexfec  |           |          | RFC8627          |
   +-------------+----------+-----------+----------+------------------+
   | text        | ttml+xml |           |          | RFC8759          |
   +-------------+----------+-----------+----------+------------------+
   | video       | VP8      | 90000     |          | RFC7741          |
   +-------------+----------+-----------+----------+------------------+
   | video       | AV1      | 90000     |          | [AV1-Media-Type] |
   +-------------+----------+-----------+----------+------------------+
   | video       | HEVC     | 90000     |          | RFC7798          |
   +-------------+----------+-----------+----------+------------------+
   | video       | smpte291 |           |          | RFC8331          |
   +-------------+----------+-----------+----------+------------------+
   | video       | VVC      | 90000     |          | RFC9328          |
   +-------------+----------+-----------+----------+------------------+
   | video       | EVC      | 90000     |          | RFC9584          |
   +-------------+----------+-----------+----------+------------------+
   | video       | flexfec  |           |          | RFC8627          |
   +-------------+----------+-----------+----------+------------------+

   Table 1: Payload Types to Register in RTP Payload Format Media Types

   IANA is requested to update the following RTP Payload types in the
   "RTP Payload Format Media Types" registry [RTP-FORMATS].

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    +============+===========+=================+==========+===========+
    | Media Type | Sub Type  | Clock Rate (Hz) | Channels | Reference |
    |            |           |                 | (audio)  |           |
    +============+===========+=================+==========+===========+
    | audio      | MP4A-LATM |                 |          | RFC6416   |
    +------------+-----------+-----------------+----------+-----------+
    | video      | MP4V-ES   | 90000           |          | RFC6416   |
    +------------+-----------+-----------------+----------+-----------+

     Table 2: Payload Types to update in RTP Payload Format Media Types

   IANA is further requested to close the "RTP Payload Format Media
   Types" registry [RTP-FORMATS] for any further registrations.  IANA
   should add the following to the existing note for the registry:

   "This registry has been closed as it was considered redundant as all
   RTP Payload formats are part of the Media Types registry
   (https://www.iana.org/assignments/media-types/media-types.xhtml).
   For further motivation see (RFC-TBD1)."

   In addition it is requested that the existing note of "RTP Payload
   Format Media Types" registry [RTP-FORMATS] is changed in the
   following way:

   OLD: Registration procedures and a registration template can be found
   in [RFC4855].

   NEW: It was previously stated that registration procedures and a
   registration template can be found in [RFC4855].  This is not
   actually the case as discussed by [RFC-TBD1].

   RFC-Editor Note: Please replace RFC-TBD1 with the RFC number of this
   specification and then remove this note.

5.  Security Considerations

   This document has no security considerations as it defines an
   administrative rule change.

6.  References

6.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

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   [RFC8088]  Westerlund, M., "How to Write an RTP Payload Format",
              RFC 8088, DOI 10.17487/RFC8088, May 2017,
              <https://www.rfc-editor.org/info/rfc8088>.

   [RTP-FORMATS]
              "IANA's registry for RTP Payload Format Media Types",
              November 2023, <https://www.iana.org/assignments/rtp-
              parameters/rtp-parameters.xhtml#rtp-parameters-2>.

   [MEDIA-TYPES]
              "IANA's registry for Media Types", November 2023,
              <https://www.iana.org/assignments/media-types/media-
              types.xhtml>.

   [AV1-Media-Type]
              "IANA Media Type Entry for video/AV1", January 2021,
              <https://www.iana.org/assignments/media-types/video/AV1>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

6.2.  Informative References

   [RFC4855]  Casner, S., "Media Type Registration of RTP Payload
              Formats", RFC 4855, DOI 10.17487/RFC4855, February 2007,
              <https://www.rfc-editor.org/info/rfc4855>.

Appendix A.  Acknowledgments

   The author likes to thank Jonathan Lennox, Zaheduzzaman Sarker,
   Bernard Aboba, Elwyn Davies, Wes Hardaker, and Hyunsik Yang for
   review and editorial fixes.

Author's Address

   Magnus Westerlund
   Ericsson
   Email: magnus.westerlund@ericsson.com

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