Network Working Group J. Rosenberg
Request for Comments: 3009 dynamicsoft
Category: Standards Track H. Schulzrinne
Columbia U.
November 2000

Registration of parityfec MIME types

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 (2000). All Rights Reserved.

Abstract

The RTP (Real-time Transport Protocol) payload format for generic
forward error correction allows RTP participants to improve loss
resiliency through the use of traditional parity-based channel codes.
This payload format requires four new MIME types, audio/parityfec,
video/parityfec, text/parityfec and application/parityfec. This
document serves as the MIME type registration for those formats.

1 IntrodUCtion

The RTP payload format for generic forward error correction [1]
allows RTP participants to improve loss resiliency through the use of
traditional parity-based channel codes. This payload format requires
four new MIME types, audio/parityfec, video/parityfec,
text/paritfyfec and application/parityfec. RFC2048 [2] defines
procedures for registration of new MIME types within the IETF tree.
Furthermore, the Audio/Video Transport working group has defined
additional procedures that must be followed when registering RTP
payload formats [3]. This document serves as the MIME type
registration for those formats based on those procedures.

2 Registration of audio/parityfec

To: ietf-types@iana.org

Subject: Registration of MIME media type audio/parityfec

MIME media type name: audio

MIME suBType name: parityfec

Required parameters: none

Note that [3] mandates that RTP payload formats without a
defined rate must define a rate parameter as part of their
MIME registration. The payload format for generic forward
error correction [1] does not specify a rate parameter.
However, the rate for FEC data is equal to the rate of the
media data it protects.

Optional parameters: none

Typical optional parameters [3], such as the number of
channels, and the duration of audio per packet, do not
apply to FEC data. The number of channels is effectively
the same as the media data it protects; the same is true
for the duration of audio per packet.

Encoding considerations: This format is only defined for
transport within the Real Time Transport protocol (RTP)
[4,5]. Its transport within RTP is fully specified with RFC
2733 [1].

Security considerations: the same security considerations
apply to these mime registrations as to the payloads for
for them, as detailed in RFC2733.

Interoperability considerations: none

Published specification: This MIME type is described fully
within RFC2733 [1].

Applications which use this media type: Audio and video
streaming tools which seek to improve resiliency to loss by
sending additional data with the media stream.

Additional information: none

Person & email address to contact for further information:

Jonathan Rosenberg
dynamicsoft
72 Eagle Rock Avenue
First Floor
East Hanover, NJ 07936
email: jdrosen@dynamicsoft.com
jdrosen@alum.mit.edu

Intended usage: COMMON

Author/Change controller: This registration is part of the IETF
registration tree.

RTP and SDP Issues: Usage of this format within RTP and the
Session Description Protocol (SDP) [6] are fully specified
within RFC2733 [1].

3 Registration of video/parityfec

To: ietf-types@iana.org

Subject: Registration of MIME media type video/parityfec

MIME media type name: video

MIME subtype name: parityfec

Required parameters: none

Note that [3] mandates that RTP payload formats without a
defined rate must define a rate parameter as part of their
MIME registration. The payload format for generic forward
error correction [1] does not specify a rate parameter.
However, the rate for FEC data is equal to the rate of the
media data it protects.

Optional parameters: none

Typical optional parameters [3], such as the number of
channels, and the duration of audio per packet, do not
apply to FEC data. The number of channels is effectively
the same as the media data it protects; the same is true
for the duration of video per packet.

Encoding considerations: This format is only defined for
transport within the Real Time Transport protocol (RTP)
[4,5]. Its transport within RTP is fully specified with RFC
2733 [1].

Security considerations: the same security considerations
apply to these MIME registrations as to the payloads for
for them, as detailed in RFC2733.

Interoperability considerations: none

Published specification: This MIME type is described fully
within RFC2733 [1].

Applications which use this media type: Audio and video
streaming tools which seek to improve resiliency to loss by
sending additional data with the media stream.

Additional information: none

Person & email address to contact for further information:

Jonathan Rosenberg
dynamicsoft
72 Eagle Rock Avenue
First Floor
East Hanover, NJ 07936
email: jdrosen@dynamicsoft.com
jdrosen@alum.mit.edu

Intended usage: COMMON

Author/Change controller: This registration is part of the IETF
registration tree.

RTP and SDP Issues: Usage of this format within RTP and the
Session Description Protocol (SDP) [6] are fully specified
within RFC2733 [1].

4 Registration of text/parityfec

To: ietf-types@iana.org

Subject: Registration of MIME media type text/parityfec

MIME media type name: text

MIME subtype name: parityfec

Required parameters: none

Note that [3] mandates that RTP payload formats without a
defined rate must define a rate parameter as part of their
MIME registration. The payload format for generic forward
error correction [1] does not specify a rate parameter.
However, the rate for FEC data is equal to the rate of the
media data it protects.

Optional parameters: none

Typical optional parameters [3], such as the number of
channels, and the duration of audio per packet, do not
apply to FEC data. The number of channels is effectively
the same as the media data it protects; the same is true
for the duration of text per packet.

Encoding considerations: This format is only defined for
transport within the Real Time Transport protocol (RTP)
[4,5]. Its transport within RTP is fully specified with RFC
2733 [1].

Security considerations: the same security considerations
apply to these MIME registrations as to the payloads for
for them, as detailed in RFC2733.

Interoperability considerations: none

Published specification: This MIME type is described fully
within RFC2733 [1].

Applications which use this media type: Audio, video and text
streaming tools which seek to improve resiliency to loss by
sending additional data with the media stream.

Additional information: none

Person & email address to contact for further information:

Jonathan Rosenberg
dynamicsoft
72 Eagle Rock Avenue
First Floor
East Hanover, NJ 07936
email: jdrosen@dynamicsoft.com
jdrosen@alum.mit.edu

Intended usage: COMMON

Author/Change controller: This registration is part of the IETF
registration tree.

RTP and SDP Issues: Usage of this format within RTP and the
Session Description Protocol (SDP) [6] are fully specified
within RFC2733 [1].

5 Registration of application/parityfec

To: ietf-types@iana.org

Subject: Registration of MIME media type application/parityfec

MIME media type name: application

MIME subtype name: parityfec

Required parameters: none

Note that [3] mandates that RTP payload formats without a
defined rate must define a rate parameter as part of their
MIME registration. The payload format for generic forward
error correction [1] does not specify a rate parameter.
However, the rate for FEC data is equal to the rate of the
media data it protects.

Optional parameters: none

Typical optional parameters [3], such as the number of
channels, and the duration of audio per packet, do not
apply to FEC data. The number of channels is effectively
the same as the media data it protects; the same is true
for the duration of application data per packet.

Encoding considerations: This format is only defined for
transport within the Real Time Transport protocol (RTP)
[4,5]. Its transport within RTP is fully specified with RFC
2733 [1].

Security considerations: the same security considerations
apply to these MIME registrations as to the payloads for
for them, as detailed in RFC2733.

Interoperability considerations: none

Published specification: This MIME type is described fully
within RFC2733 [1].

Applications which use this media type: Audio, video and
application streaming tools which seek to improve
resiliency to loss by sending additional data with the
media stream.

Additional information: none

Person & email address to contact for further information:

Jonathan Rosenberg
dynamicsoft
72 Eagle Rock Avenue
First Floor
East Hanover, NJ 07936
email: jdrosen@dynamicsoft.com
jdrosen@alum.mit.edu

Intended usage: COMMON

Author/Change controller: This registration is part of the IETF
registration tree.

RTP and SDP Issues: Usage of this format within RTP and the
Session Description Protocol (SDP) [6] are fully specified
within RFC2733 [1].

6 Security Considerations

This MIME registration does not introduce any additional security
considerations.

7 Authors' Addresses

Jonathan Rosenberg
dynamicsoft
72 Eagle Rock Avenue
First Floor
East Hanover, NJ 07936

EMail: jdrosen@dynamicsoft.com

Henning Schulzrinne
Columbia University
M/S 0401
1214 Amsterdam Ave.
New York, NY 10027-7003

EMail: schulzrinne@cs.columbia.edu

8 Bibliography

[1] Rosenberg, J. and H. Schulzrinne, "An RTP Payload Format for
Generic Forward Error Correction", RFC2733, December 1999.

[2] Freed, N., Klensin, J. and J. Postel, "Multipurpose Internet Mail
Extensions (MIME) Part Four: Registration Procedures", RFC2048,
November 1996.

[3] Casner, S. and P. Hoschka, "MIME type registration of RTP payload
formats", Work in Progress.

[4] Schulzrinne, H., Casner, S., Frederick, R. and V. Jacobson,
"RTP: a transport protocol for real-time applications", RFC1889,
January 1996.

[5] Schulzrinne, H., Casner, S., Frederick, R. and V. Jacobson, "RTP:
a transport protocol for real-time applications", Work in
Progress.

[6] Handley, M. and V. Jacobson, "SDP: Session Description Protocol",
RFC2327, April 1998.

9 Full Copyright Statement

Copyright (C) The Internet Society (2000). All Rights Reserved.

This document and translations of it may be copied and furnished to
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or assist in its implementation may be prepared, copied, published
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included on all such copies and derivative works. However, this
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The limited permissions granted above are perpetual and will not be
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