One document matched: draft-westerlund-mime-dls-00.txt
Network Working Group P. Frojdh
INTERNET-DRAFT U. Lindgren
draft-westerlund-mime-dls-00 M. Westerlund
Expires: April 2006 Ericsson
October 17, 2005
Media Type Registrations for Downloadable Sounds for MIDI
Status of this memo
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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........................................5
6. Authors' Addresses...............................................6
7. References.......................................................6
7.1. Normative......................................................6
7.2. Informative....................................................6
8. IPR Notice.......................................................7
9. Copyright Notice.................................................7
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1. Conventions Used
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
2. 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.
3. 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.
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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.
There is no current provision in the DLS standard for encryption,
signing, or authentication within the file formats.
4. IANA Considerations
The present document requests that IANA registers the media type
audio/dls as specified in Section 4.1. The registration uses the
template present in [FREED].
4.1. 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.
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Security considerations: see the security considerations
section in RFC XXXX.
Interoperability considerations: None
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): None. However, 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
Macintosh File Type Code(s): Not defined.
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
5. 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.
The normative reference [FREED] shall be updated with the RFC number
the draft receives when published.
Please remove this section before publication as RFC.
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6. 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
7. References
7.1. 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.
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March 1997.
[FREED] N. Freed, J. Klensin, "Media Type Specifications and
Registration Procedures," draft-freed--media-type-reg-05,
July 26, 2005.
7.2. Informative
[RFC3548] Josefsson, S., "The Base16, Base32, and Base64 Data
Encodings", RFC 3548, July 2003.
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8. IPR Notice
The IETF takes no position regarding the validity or scope of any
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9. Copyright Notice
Copyright (C) The Internet Society (2005). 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
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This Internet-Draft expires in April 2006.
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