wdiff rfc4723.original rfc4723.txt

Internet-Draft
Network Working Group T. Kosonen
draft-kosonen-mobile-xmf-mediatype-01.txt
Request for Comments: 4723 Nokia
Obsoletes: draft-kosonen-mobile-xmf-mediatype-00.txt
Category: Informational T. White
Expires: 3 November 2006
MMA
2 May
December 2006

Registration of media type Media Type audio/mobile-xmf

Status of this This Memo

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Abstract

The MIDI Manufacturers Association (MMA) and the Association of Music
Musical Electronics industry Industry (AMEI) have produced the Mobile XMF standard
[1]. The Mobile XMF standard has been
standard, which was developed particularly for mobile MIDI [7]
applications. Mobile XMF is a very compact media type providing high quality
high-quality synthetic audio content for music downloading and
messaging applications that require MIME registration.

Kosonen & White Expires November 3, 2006 [Page 1] This document
registers the media type audio/mobile-xmf.

1. Introduction

MIDI content is used commonly in the Internet. Commonly, 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 is a string (inside double quotation marks "") containing contains the playback resources included in all Content
Description MetaDataItems of the Mobile XMF file. The string prl contains two
digit
two-digit hexadecimal numbers representing data bytes from the
Content Description Meta Data. The same Each resource is listed
only exactly
once. A playback resource contains two parts: a prefix and
data. prl is encoded in a sequence of two-digit hex hexadecimal numbers concatenated
encoded in a US-ASCII string. 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" 000100020003 containing playback resources 01, 02, and 03
each with the prefix 00.

minimum-pr: Minimum playback requirements

minimum-pr is a string containing 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 encoded in a sequence of two-digit hex hexadecimal numbers
concatenated
encoded in a US-ASCII string.

Kosonen & White Expires November 3, 2006 [Page 2] US-ASCII. Thus, minimum-prl has an even number of
hexadecimal digits.

minimum-pr requires the use of prl prl, and the values in
minimum-pr must be in the same order as the resources in prl.
minimum-pr is the most 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".
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 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 encoded in a sequence of two-digit hex
hexadecimal numbers concatenated encoded in a US-ASCII string. US-ASCII. Thus, total-pr has an
even number of hexadecimal digits.

total-pr requires the use of prl 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". 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.

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
total-pr parameters can be used to represent Mobile DLS playback
memory requirements for protecting against the excessive usage of
playback memory.

Kosonen & White Expires November 3, 2006 [Page 3]

Interoperability considerations:

Mobile XMF is a Musical Instrument Digital Interface (MIDI)
specification developed by MMA and AMEI. mobile-xmf Mobile XMF is based on
the XMF 2.00 specification 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
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

Kosonen & White Expires November 3, 2006 [Page 4]

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 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

Kosonen & White Expires November 3, 2006 [Page 5]

6. References

6.1 Normative references:

1 References

[1] Mobile XMF Content Format Specification, MMA specification v1.0.,
RP-42, Los Angeles, CA, USA. 2004.
2

[2] Mobile DLS, MMA specification v1.0., RP-41, Los Angeles, CA, USA.
2004.
3

[3] Scalable Polyphony MIDI Specification. December 2001, RP-034,
The MIDI Manufacturers Association, Los Angeles, CA, USA.
4

[4] Scalable Polyphony MIDI Device 5-24 Note Profile for 3GPP,
December 2001, RP-035, The MIDI Manufacturers Association, Los
Angeles, CA, USA.
5

[5] Specification for XMF Meta File Format, Version 1.00b. The MIDI
Manufacturers Association, Los Angeles, CA, USA, 2001.
6

[6] XMF Meta File Format 2.00, RP-043, MIDI Manufacturers
Association, Los Angeles, CA, USA, 2004
7

[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

[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

[9] Josefsson, S., Ed., "The Base16, Base32, and Base64 Data Encodings",
RFC 3548, July 2003.

7. IPR Disclosure Acknowledgement 4648, October 2006.

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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Kosonen & White Expires November 3, 2006 [Page 7] by the IETF
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