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Versions: (draft-kosonen-mobile-xmf-mimetype)
00 01 RFC 4723
Internet-Draft T. Kosonen
draft-kosonen-mobile-xmf-mediatype-01.txt Nokia
Obsoletes: draft-kosonen-mobile-xmf-mediatype-00.txt T. White
Expires: 3 November 2006 MMA
2 May 2006
Registration of media type audio/mobile-xmf
Status of this Memo
By submitting this Internet-Draft, each author represents that any
applicable patent or other IPR claims of which he or she is aware
have been or will be disclosed, and any of which he or she becomes
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This document is an individual submission to the IETF. Comments
should be directed to the authors.
Abstract
The MIDI Manufacturers Association (MMA) and the Association of Music
Electronics industry (AMEI) have produced the Mobile XMF standard
[1]. The Mobile XMF standard has been developed particularly for
mobile MIDI [7] 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.
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1. Introduction
MIDI content is used commonly in the Internet. Commonly, 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 [2] data.
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 is a string (inside double quotation marks "") containing
the playback resources included in all Content Description
MetaDataItems of the Mobile XMF file. The string contains two
digit hexadecimal numbers representing data bytes from the
Content Description Meta Data. The same resource is listed
only once. A playback resource contains two parts: a prefix
and data. prl is encoded in two-digit hex numbers concatenated
in a US-ASCII string.
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
with the prefix 00.
minimum-pr: Minimum playback requirements
minimum-pr is a string containing 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 encoded in two-digit hex numbers
concatenated in a US-ASCII string.
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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 most important of minimum-pr and total-pr, because it
defines the minimum playback requirements.
Example: If the file includes 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 is a string containing 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 encoded in
two-digit hex numbers concatenated in a US-ASCII string.
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 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 is suitable for Email.
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.
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Interoperability considerations:
Mobile XMF is a Musical Instrument Digital Interface (MIDI)
specification developed by MMA and AMEI. mobile-xmf is based on
the XMF 2.00 specification [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
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
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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.
5. 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
Tel (714) 736-9774
Fax (714) 736-9775
Email: twhite@midi.org
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6. References
6.1 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., Ed., "The Base16, Base32, and Base64 Data
Encodings", RFC 3548, July 2003.
7. IPR Disclosure Acknowledgement
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
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on the procedures with respect to rights in RFC documents can be
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Copies of IPR disclosures made to the IETF Secretariat and any
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attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
http://www.ietf.org/ipr.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights that may cover technology that may be required to implement
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this standard. Please address the information to the IETF at ietf-
ipr@ietf.org.
8. Copyright notice
Copyright (C) The Internet Society (2006). This document is subject
to the rights, licenses and restrictions contained in BCP 78, and
except as set forth therein, the authors retain all their rights.
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
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Kosonen & White Expires November 3, 2006 [Page 7]
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