wdiff rfc4613.original rfc4613.txt

Network Working Group P. Frojdh
INTERNET-DRAFT
Request for Comments: 4613 U. Lindgren
draft-westerlund-mime-dls-01
Category: Informational M. Westerlund
Expires: August 2006
Ericsson
February 10,
August 2006

Media Type Registrations for Downloadable Sounds
for MIDI Musical Instrument Digital Interface (MIDI)

Status of this This Memo

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Abstract

This document serves to register a media type for Downloadable
Sounds.

TABLE OF CONTENTS

Table of Contents

1. Conventions Used.................................................3 Introduction ....................................................1
2. Introduction.....................................................3
3. Security Considerations..........................................3
4. Considerations .........................................2
3. IANA Considerations..............................................4
4.1. Considerations .............................................2
3.1. Media Type for 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 Sounds .........................3
4. References ......................................................5
4.1. Normative References .......................................5
4.2. Informative References .....................................5

1. Introduction

The present document seeks to register a media type for Downloadable
Sounds (DLS). (DLSes). The DLS format is used to define instruments for
widely used wavetable synthesizers associated with the standards
[DLS1, DLS2, MDLS]. DLS, DLSes and their associated standards are
maintained and defined by two organizations, the MIDI Musical Instrument
Digital Interface (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 correctly
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 that 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

Clearly, it is possible to author malicious files which, that, for example,
contain large amounts of data always blocked by a conditional statement, i.e.
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 A key point is stressed that the chunk in question is conditional
chunks are optional, that is to say is, a parser does not have to execute the a
conditional chunk. However, if a parser evaluates a conditional
chunk, it is still possible to parse its content and draw to a
conclusion as to whether
or not it is usable for a particular synthesizer
engine.

It should be noted

Note that selected metadata fields may include information partly
intended to protect the media against unauthorized use or
distribution. In this case case, the intention is that alteration or
removal of the data in the field would be treated as an offence offense under
national agreements based on World
Intellection Intellectual Property Organization
(WIPO) treaties.

DLS have an extensible structure, making it theoretically possible to
define metadata fields or media formats in the future which that could be
used to induce particular actions of the recipient, and thus that
would 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.

3. IANA Considerations

The present document requests that IANA registers has registered the media type
audio/dls 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 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. 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 Section 2 of RFC XXXX. 4613.

Interoperability considerations: This media type is for the
consumption by a MIDI player
capable of utilizing
downloadable sounds for its
synthesizers. A general purpose 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 that 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

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.

4.1. Normative References

[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.

6.2.

4.2. Informative References

[RFC3548] Josefsson, S., "The Base16, Base32, and Base64 Data
Encodings", RFC 3548, July 2003.

IPR Notice

Authors' Addresses

Per Frojdh
Ericsson AB
Ericsson Research
SE-164 80 Stockholm
Sweden

EMail: per.frojdh@ericsson.com

Ulf A. Lindgren
Ericsson AB
Ericsson Research
SE-417 56 Goteborg
Sweden

EMail: ulf.a.lindgren@ericsson.com

Magnus Westerlund
Ericsson AB
Ericsson Research
SE-164 80 Stockholm
Sweden

EMail: magnus.westerlund@ericsson.com

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