Internet Engineering Task Force INTERNET-DRAFT R. Castagno and D. Singer draft-singer-avt-3gpp-mime-01 Nokia and Apple Computer Sep 3 2003 Expires: Mar 3 2004 MIME Type Registrations for 3GPP Multimedia files Status of This Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet- Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/1id-abstracts.html The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html Distribution of this document is unlimited. Copyright Notice Copyright (C) The Internet Society (2003). All Rights Reserved. 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 RFC 2119 [RFC2119]. R. Castagno and D. Singer [Page 1]
Internet Draft draft-singer-avt-3gpp-mime-01 Sep 3 2003 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 or 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'. Files identified by the MIME 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 correctly to 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 offence under national agreements based World Intellection 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, but 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. R. Castagno and D. Singer [Page 2]
Internet Draft draft-singer-avt-3gpp-mime-01 Sep 3 2003 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). To: ietf-types@iana.org Subject: Registration of Standard MIME media type audio/3gpp MIME media type name: audio MIME subtype name: 3gpp Required parameters: none Optional parameters: none Encoding considerations: files are binary and should be transmitted in a suitable encoding without CR/LF conversion, 7-bit stripping etc.; base64 is a suitable encoding. Note that this MIME type is used only for files; separate types are used for real-time transfer, such as for the RTP payload format for AMR audio [RFC3267]. Security considerations: see the security considerations section in RFC XXXX Interoperability considerations: The 3GPP organization has defined the specification, interoperability and conformance, and conducts regular interoperability testing. Published specification: 3GPP 26.234, Release 5; 3GPP 26.244, Release 6 or later. 3GPP specifications are publicly accessible at the 3GPP web site, www.3gpp.org. Applications which use this media type: Multi-media Additional information: The type "audio/3gpp" MAY be used for files containing audio but no visual presentation. Files served under this type MUST NOT contain any visual material. (Note that 3GPP timed text is visually presented and is considered to be visual material). Magic number(s): None. However, the file-type box R. Castagno and D. Singer [Page 3]
Internet Draft draft-singer-avt-3gpp-mime-01 Sep 3 2003 must occur first in the file, and MUST contain a 3GPP brand in its compatible brands list. File extension(s): 3gp and 3gpp are both declared at http://www.nist.gov/nics/; 3gp is preferred Macintosh File Type Code(s): '3gpp' Person & email address to contact for further information: Nokia MIME manager, mime@nokia.com Intended usage: COMMON Change controller: 3GPP 3.2 Any files The type "video/3gpp" is valid for all files. It is valid to serve an audio-only file as "video/3gpp". To: ietf-types@iana.org Subject: Registration of Standard MIME media type video/3gpp MIME media type name: video MIME subtype name: 3gpp Required parameters: none Optional parameters: none Encoding considerations: files are binary and should be transmitted in a suitable encoding without CR/LF conversion, 7-bit stripping etc.; base64 is a suitable encoding. Note that this MIME type is used only for files; separate types are used for real-time transfer, such as for the RTP payload formats for H.263 [RFC2429] and AMR audio [RFC3267]. Security considerations: see the security considerations section in RFC XXXX Interoperability considerations: The 3GPP organization has defined the specification, interoperability and conformance, and conducts regular interoperability testing. Published specification: 3GPP 26.234, Release 5; 3GPP 26.244, Release 6 or later. 3GPP specifications are publicly accessible at the 3GPP web site, www.3gpp.org. Applications which use this media type: Multi-media Additional information: Magic number(s): None. However, the file-type box R. Castagno and D. Singer [Page 4]
Internet Draft draft-singer-avt-3gpp-mime-01 Sep 3 2003 must occur first in the file, and MUST contain a 3GPP brand in its compatible brands list. File extension(s): 3gp and 3gpp are both declared at http://www.nist.gov/nics/; 3gp is preferred Macintosh File Type Code(s): '3gpp' Person & email address to contact for further information: Nokia MIME manager, mime@nokia.com Intended usage: COMMON Change controller: 3GPP 4 IANA Considerations This document registers the MIME types audio/3gpp and video/3gpp, defined above. 5 RFC Editor Considerations The references to RFC XXXX in the MIME registrations need to be replaced with the actual RFC number when it is issued. 6 Full Copyright Statement Copyright (C) The Internet Society (2003). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING R. Castagno and D. Singer [Page 5]
Internet Draft draft-singer-avt-3gpp-mime-01 Sep 3 2003 BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 7 Intellectual Property Notice The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards-related documentation can be found in BCP-11. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF Secretariat. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights which may cover technology that may be required to practice this standard. Please address the information to the IETF Executive Director. 8 Acknowledgments The review of the 3GPP SA4 committee is gratefully acknowledged, in particular Per Frojdh. The chairs of the AVT working group, in particular Colin Perkins, have provided both excellent guidance and feedback, for which the authors are grateful. R. Castagno and D. Singer [Page 6]
Internet Draft draft-singer-avt-3gpp-mime-01 Sep 3 2003 9 Authors' Contact Information David Singer Apple Computer, Inc. One Infinite Loop, MS:302-3MT Cupertino CA 95014 USA Email: singer@apple.com Tel: +1 408 974 3162 Roberto Castagno Nokia Mobile Phones PO Box 88, FIN-33721 Tampere (Tieteenkatu 1, FIN-33720 Tampere) Finland Email: roberto.castagno@nokia.com Tel: +358 7180 35796 9 References Normative [3gpp] Published specifications in releases 5 and 6: Release 5: 3GPP TS 26.234: Transparent end-to-end packet switched streaming service (PSS); Protocols and codecs. Release 6: 3GPP TS 26.244: Transparent end-to-end packet switched streaming service (PSS); 3GPP file format (3GP) [MIME1] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies", RFC 2045, November 1996. [RFC2119] S. Bradner, "Key words for use in RFCs to Indicate Requirement Levels", RFC 2119, March 1997 Informative [RFC2429] C. Borman et al., "RTP Payload format for the 1998 version of ITU-T Rec. H.263 Video (H.263+)" RFC 2429, October 1998 [RFC3267] J. Sjoberg et al., "RTP Payload format and File Storage format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate WideBand (AMR-WB) Audio Codecs" RFC 3267, June 2002 R. Castagno and D. Singer [Page 7]
Internet Draft draft-singer-avt-3gpp-mime-01 Sep 3 2003 R. Castagno and D. Singer [Page 8]
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David Singer
Apple Computer/QuickTime
