One document matched: draft-westerlund-mime-dls-01.txt
Differences from draft-westerlund-mime-dls-00.txt
Network Working Group P. Frojdh
INTERNET-DRAFT U. Lindgren
draft-westerlund-mime-dls-01 M. Westerlund
Expires: August 2006 Ericsson
February 10, 2006
Media Type Registrations for Downloadable Sounds for MIDI
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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Abstract
This document serves to register a media type for Downloadable
Sounds.
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TABLE OF CONTENTS
1. Conventions Used.................................................3
2. Introduction.....................................................3
3. Security Considerations..........................................3
4. IANA Considerations..............................................4
4.1. Downloadable Sound.............................................4
5. RFC Editor Considerations........................................6
6. Authors' Addresses...............................................6
7. References.......................................................6
7.1. Normative......................................................6
7.2. Informative....................................................7
8. IPR Notice.......................................................7
9. Copyright Notice.................................................7
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1. Introduction
The present document seeks to register a media type for
Downloadable Sounds (DLS). The DLS format is used to define
instruments for widely used wavetable synthesizers associated with
the standards [DLS1, DLS2, MDLS]. DLS, and their associated
standards are maintained and defined by two organizations, the MIDI
Manufacturers Association (MMA) and the Association of the Musical
Electronics Industry (AMEI).
The media type defined here is needed to correctly identify DLS
files when they are served over HTTP, included in multi-part
documents, or used in other places where media types are used.
2. Security Considerations
The DLS format may contain audio, displayable text data, and
modeling parameters (a.k.a. articulation parameters). In addition,
the DLS format contains a so-called conditional chunk which is
'active' in the sense that it affects the execution of a DLS file
parser. However, the DLS format does not currently define any
scripting mechanism.
Clearly it is possible to author malicious files which, for
example, contain large amounts of data always blocked by a
conditional statement, i.e. no synthesizer loads the instruments.
However, for DLS, clients can and usually do protect themselves
against these kinds of attacks. For DLS content containing
conditional chunks it is stressed that the chunk in question is
optional, that is to say a parser does not have to execute the
chunk. However, if a parser evaluates a conditional chunk, it is
still possible to parse its content and draw a conclusion whether
or not it is usable for a particular synthesizer engine.
It should be noted that selected metadata fields may include
information partly intended to protect the media against
unauthorized use or distribution. In this case the intention is
that alteration or removal of the data in the field would be
treated as an offence under national agreements based on World
Intellection Property Organization (WIPO) treaties.
DLS have an extensible structure, making it theoretically possible
to define metadata fields or media formats in the future which
could be used to induce particular actions of the recipient, and
thus present additional security risks. However, this type of
capability is currently not supported in the referenced
specifications.
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There is no current provision in the DLS standard for encryption,
signing, or authentication within the file formats.
3. IANA Considerations
The present document requests that IANA registers the media type
audio/dls as specified in Section 3.1. The registration uses the
template present in [RFC4288].
3.1. Media Type for Downloadable Sounds
Type name: audio
Subtype name: dls
Required parameters: none
Optional parameters: 'dls-type'
A comma-separated list of the
dls types (one or more) that the
file content conforms to. The
following values are specified:
0, 1, and 2 signify Downloadable
Sounds Level 1.1b content,
Downloadable Sounds Level 2.1
content, and Mobile Downloadable
Sound content, respectively. All
types that the content conforms
to should be indicated. Further
values (integers) may be
specified in the future, and any
unknown values shall be ignored.
If the parameter is not
specified, it corresponds to a
value equal to 0, i.e. the
content conforms to Downloadable
Sound level 1.1b.
Encoding considerations: DLS files are binary and should
be transmitted in a suitable
encoding without CR/LF
conversion, 7-bit stripping
etc.; base64 [RFC3548] is a
suitable encoding.
Security considerations: see the security considerations
in section 3 of RFC XXXX.
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Interoperability considerations: This media type is for the
consumption by a MIDI player
capable of utilizing
downloadable sounds for its
synthesizers. A general purpose
audio player will not be capable
of utilizing the audio within
the format without explicit
support of the format.
Published specification: Downloadable Sounds Level 1.1b
[DLS1], Downloadable Sounds
Level 2.1 [DLS2], and Mobile
Downloadable Sounds [MDLS]. MMA
specifications can be ordered
from the MMA web site,
www.midi.org.
Applications which use this media type: Multi-media
Additional information:
Magic number(s): The ninth to twelfth bytes of
the file must equal (in
hexadecimal notation) 44, 4c,
53, and 20, respectively.
File extension(s): .dls is declared at
http://www.nist.gov/nics
Person & email address to contact for further information:
Ulf A. Lindgren,
ulf.a.lindgren@ericsson.com
Intended usage: COMMON
Restrictions on usage: None
Author: Per Frojdh
Ulf A. Lindgren
Magnus Westerlund
Change controller: MIDI Manufacturers Association
http://www.midi.org
info@midi.org
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4. RFC Editor Considerations
The references to RFC XXXX in the media type registration need to
be replaced with the actual RFC number when it is issued.
Please remove this section before publication as RFC.
Authors' Addresses
Per Frojdh
Ericsson AB
Ericsson Research
SE-164 80 Stockholm
Sweden
electronic mail: per.frojdh@ericsson.com
Ulf A. Lindgren
Ericsson AB
Ericsson Research
SE-417 56 Goteborg
Sweden
electronic mail: ulf.a.lindgren@ericsson.com
Magnus Westerlund
Ericsson AB
Ericsson Research
SE-164 80 Stockholm
Sweden
electronic mail: magnus.westerlund@ericsson.com
6. References
6.1. Normative
[DLS1] "Downloadable Sounds Level 1.1b", MMA/AMEI
specificationv1.1b, Los Angeles, CA, USA, 2004.
[DLS2] "Downloadable Sounds Level 2.1", MMA/AMEI specification
v1.0, Los Angeles, CA, USA, 2001.
[MDLS] "Mobile Downloadable Sounds 1.0", MMA specification
v1.0, Los Angeles, CA, USA, 2004.
[RFC4288] Freed, N. and J. Klensin, "Media Type Specifications
and Registration Procedures", BCP 13, RFC 4288,
December 2005.
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6.2. Informative
[RFC3548] Josefsson, S., "The Base16, Base32, and Base64 Data
Encodings", RFC 3548, July 2003.
IPR Notice
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8. Copyright Notice
Copyright (C) The Internet Society (2006). This document is
subject to the rights, licenses and restrictions contained in BCP
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This Internet-Draft expires in August 2006.
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