RTP Payload Format for MIDI
RFC 6295

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Internet Engineering Task Force (IETF)                        J. Lazzaro
Request for Comments: 6295                                  J. Wawrzynek
Obsoletes: 4695                                              UC Berkeley
Category: Standards Track                                      June 2011
ISSN: 2070-1721

                      RTP Payload Format for MIDI

Abstract

   This memo describes a Real-time Transport Protocol (RTP) payload
   format for the MIDI (Musical Instrument Digital Interface) command
   language.  The format encodes all commands that may legally appear on
   a MIDI 1.0 DIN cable.  The format is suitable for interactive
   applications (such as network musical performance) and content-
   delivery applications (such as file streaming).  The format may be
   used over unicast and multicast UDP and TCP, and it defines tools for
   graceful recovery from packet loss.  Stream behavior, including the
   MIDI rendering method, may be customized during session setup.  The
   format also serves as a mode for the mpeg4-generic format, to support
   the MPEG 4 Audio Object Types for General MIDI, Downloadable Sounds
   Level 2, and Structured Audio.  This document obsoletes RFC 4695.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6295.

Copyright Notice

   Copyright (c) 2011 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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Lazzaro & Wawrzynek          Standards Track                    [Page 1]
RFC 6295               RTP Payload Format for MIDI             June 2011

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................4
      1.1. Terminology ................................................6
      1.2. Bitfield Conventions .......................................6
   2. Packet Format ...................................................6
      2.1. RTP Header .................................................7
      2.2. MIDI Payload ..............................................11
   3. MIDI Command Section ...........................................13
      3.1. Timestamps ................................................14
      3.2. Command Coding ............................................16
   4. The Recovery Journal System ....................................22
   5. Recovery Journal Format ........................................24
   6. Session Description Protocol ...................................28
      6.1. Session Descriptions for Native Streams ...................29
      6.2. Session Descriptions for mpeg4-generic Streams ............30
      6.3. Parameters ................................................33
   7. Extensibility ..................................................34
   8. Congestion Control .............................................35
   9. Security Considerations ........................................35
   10. Acknowledgements ..............................................36
   11. IANA Considerations ...........................................37
      11.1. rtp-midi Media Type Registration .........................38
           11.1.1. Repository Request for audio/rtp-midi .............40
      11.2. mpeg4-generic Media Type Registration ....................42
           11.2.1. Repository Request for Mode rtp-midi for
                   mpeg4-generic .....................................44
      11.3. asc Media Type Registration ..............................46
   12. Changes from RFC 4695 .........................................48
   Appendix A. The Recovery Journal Channel Chapters .................52
      A.1. Recovery Journal Definitions ..............................52
      A.2. Chapter P: MIDI Program Change ............................56
      A.3. Chapter C: MIDI Control Change ............................57
           A.3.1. Log Inclusion Rules ................................58
           A.3.2. Controller Log Format ..............................59