MIME Type Registrations for 3rd Generation Partnership Project (3GPP) Multimedia files
RFC 3839

Document Type RFC - Proposed Standard (July 2004; No errata)
Updated by RFC 6381
Was draft-singer-avt-3gpp-mime (individual in tsv area)
Last updated 2013-03-02
Stream IETF
Formats plain text pdf html
Stream WG state (None)
Consensus Unknown
Document shepherd No shepherd assigned
This information refers to IESG processing after the RFC was initially published:
IESG IESG state RFC 3839 (Proposed Standard)
Telechat date
Responsible AD Alexey Melnikov
IESG note Magnus Westerlund has agreed to serve as the document shepherd.
Note that this document is obsoleted by 3GPP TS 26.244 V8.1.0.
Send notices to singer@apple.com, roberto.castagno@nokia.com, magnus.westerlund@ericsson.com
Network Working Group                                        R. Castagno
Request for Comments: 3839                           Nokia Mobile Phones
Category: Standards Track                                      D. Singer
                                                    Apple Computer, Inc.
                                                               July 2004

                      MIME Type Registrations for
      3rd Generation Partnership Project (3GPP) Multimedia files

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   This document serves to register and document the standard MIME types
   associated with the 3GPP multimedia file format, which is part of the
   family based on the ISO Media File Format.

1.  Introduction

   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 BCP 14, RFC 2119
   [RFC2119].

   The third-generation partnership project (3GPP) for third-generation
   cellular telephony has defined a standard file format to contain
   audio/visual sequences which may be downloaded to cellular phones
   [3GPP].  At the time of writing, the 3GPP file format (3GP) can
   contain H.263 or MPEG-4 video, and AMR Narrow-band speech, AMR wide-
   band speech, or AAC audio, and 3GPP timed text.

   Within the file, as with all files in the 'ISO' family, there is an
   intrinsic file-type box, which identifies those specifications to
   which the file complies, and which players (possibly compliant with
   only one specification) are permitted by the content author to play
   the file.  This identification is through four-letter 'brands'.

Castagno & Singer           Standards Track                     [Page 1]
RFC 3839            MIME Type Registrations for 3GPP           July 2004

   Files identified by the MIME [MIME1] type defined here MUST contain a
   brand defined in a standard issued by 3GPP that can apply to 3GPP
   files, in their compatible brands list.

   The MIME types defined here are needed to correctly identify such
   files when they are served over HTTP, included in multi-part
   documents, or used in other places where MIME types are used.

2.  Security Considerations

   The 3GPP file format may contain audio, video, and displayable text
   data.  There is currently no provision for 'active' elements (such as
   scripts) of any kind.

   Clearly it is possible to author malicious files which attempt to
   call for an excessively large picture size, high sampling-rate audio
   etc.  However, clients can and usually do protect themselves against
   this kind of attack.

   It should be noted that selected metadata fields may encompass
   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 offense
   under national agreements based on World Intellectual Property
   Organization (WIPO) treaties.

   3GPP files have an extensible structure, so that it is theoretically
   possible that metadata fields or media formats could be defined in
   the future which could be used to induce particular actions on the
   part of the recipient, thus presenting additional security risks.
   However, this type of capability is currently not supported in the
   referenced specification.

   There is no current provision in the standards for encryption,
   signing, or authentication of these file formats.

3.  MIME Types

   This registration applies to all files defined as using the '3GP'
   file format and identified with a suitable brand in a 3GPP
   specification.  The usual file suffix for all these files is ".3gp".

3.1.  Files with audio but no video

   The type "audio/3gpp" may be used for files containing audio but no
   visual presentation (neither video nor timed text, for example).

Castagno & Singer           Standards Track                     [Page 2]
RFC 3839            MIME Type Registrations for 3GPP           July 2004

   To: ietf-types@iana.org
   Subject: Registration of Standard MIME media type audio/3gpp
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