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RFC 4723

Registration of Media Type audio/mobile-xmf

Pages: 8
Informational

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Network Working Group                                         T. Kosonen
Request for Comments: 4723                                         Nokia
Category: Informational                                         T. White
                                                                     MMA
                                                           December 2006


              Registration of Media Type audio/mobile-xmf

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The IETF Trust (2006).

Abstract

The MIDI Manufacturers Association (MMA) and the Association of Musical Electronics Industry (AMEI) have produced the Mobile XMF standard, which was developed particularly for mobile MIDI applications. Mobile XMF is a very compact media type providing high-quality synthetic audio content for music downloading and messaging applications that require MIME registration. This document registers the media type audio/mobile-xmf.
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1. Introduction

MIDI content is used commonly in the Internet. Typically, MIDI data is stored in the Standard MIDI File (SMF) format [8]. This MIME type registration uses the Mobile XMF file format for the encapsulation of SP-MIDI [3,4] and Mobile DLS (Downloadable Sounds) [2] data. The MIDI Manufacturers Association (MMA) and the Association of Musical Electronics Industry (AMEI) have produced the Mobile XMF standard [1], which was developed particularly for mobile MIDI [7] applications.

2. Registration of audio/mobile-xmf

Type name: audio Subtype name: mobile-xmf Required parameters: none Optional parameters: revision: Mobile XMF file type revision ID revision is the Mobile XMF file type revision ID number from the XmfFileTypeRevisionID field of the XMF Meta File format 2.00. revision is encoded in hex in US-ASCII. prl: Playback resource list prl contains the playback resources included in all Content Description MetaDataItems of the Mobile XMF file. prl contains two-digit hexadecimal numbers representing data bytes from the Content Description Meta Data. Each resource is listed exactly once. A playback resource contains two parts: a prefix and data. prl is a sequence of two-digit hexadecimal numbers encoded in US-ASCII. Thus, prl has an even number of hexadecimal digits. Example: If the file includes Playback Resource Lists such as [00h 01h 00h 02h] and [00h 01h 00h 03h], the corresponding prl is 000100020003 containing playback resources 01, 02, and 03 each with the prefix 00.
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      minimum-pr: Minimum playback requirements

         minimum-pr contains the Maximum Instantaneous Resource (MIR)
         values from the first row of all MIR Count Tables corresponding
         to the playback resources listed in prl.  Only the largest
         value from the values of the same resource is chosen.
         minimum-prl is a sequence of two-digit hexadecimal numbers
         encoded in US-ASCII.  Thus, minimum-prl has an even number of
         hexadecimal digits.

         minimum-pr requires the use of prl, and the values in
         minimum-pr must be in the same order as the resources in prl.
         minimum-pr is the more important of minimum-pr and total-pr,
         because it defines the minimum playback requirements.

         Example: If the file includes the first rows of MIR Count
         Tables such as [02h 00h] and [01h 01h] corresponding to the
         above Playback Resource Lists, the corresponding minimum-pr is
         020001.  (02 is the largest of 2 and 1, 00 is the largest of 0,
         and 01 is the largest of 1.)

      total-pr: Total playback requirements

         total-pr contains the MIR values from the last row of all MIR
         Count Tables corresponding to the playback resources listed in
         prl.  Only the largest value from the values of the same
         resource is chosen.  total-pr is a sequence of two-digit
         hexadecimal numbers encoded in US-ASCII.  Thus, total-pr has an
         even number of hexadecimal digits.

         total-pr requires the use of prl, and the values in total-pr
         must be in the same order as the resources in prl.

         Example: If the file includes the last rows of MIR Count Tables
         such as [05h 02h] and [06h 01h] corresponding to the above
         Playback Resource Lists, the corresponding total-pr is 060201.
         (06 is the largest of 5 and 6, 02 is the largest of 2, and 01
         is the largest of 1.)

   Encoding considerations:

      mobile-xmf data is binary data and must be encoded for non-binary
      transport; Base64 [9] is suitable for Email.
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   Security considerations:

      Many synthetic audio compositions have associated intellectual
      property rights.  It is conceivable that the rights owners of
      mobile-xmf content will want to protect their rights by applying
      security mechanisms that prohibit the rendering of the content
      without a legally acquired license to do so.  These mechanisms
      would be applied externally to the Content-Type defined here;
      mobile-xmf content itself is not encrypted internally.  mobile-xmf
      streams do not contain executable content.  Mobile XMF players are
      robust against corrupted mobile-xmf content, because Mobile XMF
      players ignore unidentified content.  prl, minimum-pr, and
      total-pr parameters can be used to represent Mobile DLS playback
      memory requirements for protecting against the excessive usage of
      playback memory.

   Interoperability considerations:

      Mobile XMF is a Musical Instrument Digital Interface (MIDI)
      specification developed by MMA and AMEI.  Mobile XMF is based on
      the XMF Meta File Format Specification v2.00 [5,6], which
      standardizes a meta file format for the electronic distribution of
      music.  mobile-xmf data is stored in XMF file format [5,6].

   Published specification:

      Mobile XMF Content Format Specification, MMA specification v1.0.,
        RP-42, Los Angeles, CA, USA.  2004.

      Specification is available from:
        http://www.midi.org/about-midi/specshome.shtml

   Applications which use this media type:

      mobile-xmf is a synthetic audio format for the flexible
      presentation of SP-MIDI and Mobile DLS instrument data on a wide
      range of playback devices, particularly portable appliances such
      as mobile phones, PDAs, and palmtop computers.

   Additional information:

      Magic number(s):

      First twelve bytes:
      \130\115\106\137\062\056\060\060\000\000\000\002
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      File extension(s): mxmf

      Macintosh File Type Code(s): mxmf

   Person & email address to contact for further information:

      Timo Kosonen
      Email: timo.kosonen@nokia.com

   Intended usage: COMMON

   Restrictions on usage: none

   Authors:

      Timo Kosonen
      Email: timo.Kosonen@nokia.com

      Tom White
      Email: twhite@midi.org

   Change controller:

      MIDI Manufacturers Association
      P.O. Box 3173
      La Habra, CA  90632-3173
      Tel (714) 736-9774
      Fax (714) 736-9775
      Point of contact:
      Tom White
      Email: twhite@midi.org

3. Security Considerations

Security considerations are specified in the MIME subtype registration contained in Section 2.

4. IANA Considerations

Section 2 of this document registers one MIME subtype.
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5. Normative References

[1] Mobile XMF Content Format Specification, MMA specification v1.0., RP-42, Los Angeles, CA, USA. 2004. [2] Mobile DLS, MMA specification v1.0., RP-41, Los Angeles, CA, USA. 2004. [3] Scalable Polyphony MIDI Specification. December 2001, RP-034, The MIDI Manufacturers Association, Los Angeles, CA, USA. [4] Scalable Polyphony MIDI Device 5-24 Note Profile for 3GPP, December 2001, RP-035, The MIDI Manufacturers Association, Los Angeles, CA, USA. [5] Specification for XMF Meta File Format, Version 1.00b. The MIDI Manufacturers Association, Los Angeles, CA, USA, 2001. [6] XMF Meta File Format 2.00, RP-043, MIDI Manufacturers Association, Los Angeles, CA, USA, 2004 [7] MIDI 1.0 Detailed Specification, Document Version 4.2. February 1996, In 'The Complete MIDI 1.0 Detailed Specification, Document Version 96.1.' The MIDI Manufacturers Association., Los Angeles, CA, USA. [8] Standard MIDI Files 1.0, In 'The Complete MIDI 1.0 Detailed Specification, Document Version 96.1.' The MIDI Manufacturers Association., Los Angeles, CA, USA. [9] Josefsson, S., "The Base16, Base32, and Base64 Data Encodings", RFC 4648, October 2006.
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Authors' Addresses

Timo Kosonen Nokia P.O. Box 100 33721 Tampere Finland Tel: +358 5048 35206 Fax: +358 7180 35899 EMail: timo.kosonen@nokia.com Tom White MIDI Manufacturers Association P.O. Box 3173 La Habra, CA 90632-3173 USA Tel: (714) 736-9774 Fax: (714) 736-9775 EMail: twhite@midi.org
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