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Versions: 00 01 RFC 4613

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
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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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   rights.

   This document and the information contained herein are provided on
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   This Internet-Draft expires in August 2006.






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