Network Working Group L. Walleij
Internet-Draft The Ogg Vorbis Community
Expires: November 20, 2001 May 22, 2001
The application/ogg Media Type
draft-walleij-ogg-mediatype-02
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/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
This Internet-Draft will expire on November 17, 2001.
Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
The Ogg Bitstream Format aim at becoming a general patent-free
standard for transporting multimedia content across computing
platforms and networks. The intention of this document is to define
the media type application/ogg to refer to this kind of content when
transported across the Internet.
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 [2].
Walleij Expires November 17, 2001 [Page 1]
Internet-Draft The application/ogg Media Type May 2001
1. The Ogg Bitstream Format
The Ogg Bitstream format has been developed as a part of a larger
project aimed at creating a set of components for the coding and
decoding of multimedia content (codecs) which are to be freely
available and freely re-implementable both in software and in
hardware for the computing community at large, including the
Internet community.
Raw packets from these codecs may be used directly by transport
mechanisms that provide their own framing and packet-seperation
mechanisms (such as UDP datagrams).
For stream based storage (such as files) and transport (such as TCP
streams or pipes), Ogg codecs use the Ogg Bitstream Format to
provide framing/sync, sync recapture after error, landmarks during
seeking, and enough information to properly seperate data back into
packets at the original packet boundaries without relying on decoding
to find packet boundaries. The application/ogg MIME type refers to
this kind of bitstreams, when no further knowledge of the bitstream
content exists.
The bitstream format in itself is documented in [1].
Walleij Expires November 17, 2001 [Page 2]
Internet-Draft The application/ogg Media Type May 2001
2. Registration Information
To: ietf-types@iana.org
Subject: Registration of MIME media type application/ogg
MIME media type name: application
MIME subtype name: ogg
Required parameters: none
Optional parameters: none
Encoding Considerations:
The Ogg bitstream format is binary data, and must be encoded for non-
binary transport; the Base64 encoding is suitable for Email, Binary
encoding could also be used.
Security Considerations:
As the Ogg bitstream file is a container format and only a carrier of
content (such as Vorbis audio) with a very rigid definition (see
[1]), this format in itself is not more vulnerable than any other
content framing mechanism. The main security consideration for the
receiving application is to ensure that manipulated packages can not
cause buffer overflows and the like. It is possible to encapsulate
even execuatble content in the bitstream, so for such uses additional
security considerations must be taken.
Ogg bitstream files are not signed or encrypted using any applicable
encryption schemes. External security mechanisms must be added if
content confidentiality and authenticity is to be achieved.
Interoperability considerations:
The Ogg bitstream format has proved to be widely implementable across
different computing platforms. A broadly portable reference
implementation is available under a BSD license.
The Ogg bitstream format is not patented and can be implemented by
third parties without patent considerations.
Published specification:
See [1].
Walleij Expires November 17, 2001 [Page 3]
Internet-Draft The application/ogg Media Type May 2001
Applications which use this media type:
Any application that implements the specification will be able to
encode or decode Ogg bitstream files. Specifically, the format is
supposed to be used by codecs that implement for example Vorbis
audio.
Additional information:
Magic number(s):
In Ogg bitstream files, the first four bytes are 0x4f 0x67 0x67 0x53
corresponding to the string "OggS".
File extension: .ogg
Macintosh File Type Code(s): OggS
Object Identifier(s) or OID(s): none
Person & email address to contact for further information:
Questions about this proposal should be directed to Linus Walleij
<triad@df.lth.se>. Technical questions about the Ogg bitstream
standard may be asked on the mailing lists for the developer
community. <http://www.xiph.org/archives/>
Intended usage: COMMON
Author/Change controller:
This document was written by Linus Walleij <triad@df.lth.se>, changes
of this document will be handled by him or a representative of the
Xiph.org Foundation or the associated development communities.
The Ogg bitstream format is controlled by the Xiph.org Foundation and
the respective development communities.
Walleij Expires November 17, 2001 [Page 4]
Internet-Draft The application/ogg Media Type May 2001
3. Security Considerations
Security considerations are discussed in the security considerations
clause of the MIME registration in section 2.
Walleij Expires November 17, 2001 [Page 5]
Internet-Draft The application/ogg Media Type May 2001
References
[1] The Xiph.org Foundation, "Ogg logical and physical
bitstream overview", June 2001,
<http://xiph.org/ogg/doc/oggstream.html>.
[2] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
Author's Address
Linus Walleij
The Ogg Vorbis Community
Master Olofs Vag 24
Lund 224 66
SE
Phone: +46 703 193678
EMail: triad@df.lth.se
URI: http://www.xiph.org/
Walleij Expires November 17, 2001 [Page 6]
Internet-Draft The application/ogg Media Type May 2001
Full Copyright Statement
Copyright (C) The Internet Society (2001). 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
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.
Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
Walleij Expires November 17, 2001 [Page 7]