draft-ietf-mmusic-decoding-dependency-07.txt   draft-ietf-mmusic-decoding-dependency-08.txt 
Network Working Group T. Schierl Network Working Group T. Schierl
Internet-Draft Fraunhofer HHI Internet-Draft Fraunhofer HHI
Intended status: Standards Track S. Wenger Intended status: Standards Track S. Wenger
Expires: October 1, 2009 Nokia Expires: October 2, 2009 Nokia
April 2, 2009 April 3, 2009
Signaling media decoding dependency in Session Description Protocol Signaling media decoding dependency in Session Description Protocol
(SDP) (SDP)
draft-ietf-mmusic-decoding-dependency-07 draft-ietf-mmusic-decoding-dependency-08
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
This Internet-Draft will expire on October 1, 2009. This Internet-Draft will expire on October 2, 2009.
Copyright Notice Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the Copyright (c) 2009 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of Provisions Relating to IETF Documents in effect on the date of
publication of this document (http://trustee.ietf.org/license-info). publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
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6.2. Declarative usage .......................................... 12 6.2. Declarative usage .......................................... 12
6.3. Usage with AVP and SAVP RTP profiles ....................... 12 6.3. Usage with AVP and SAVP RTP profiles ....................... 12
6.4. Usage with Capability Negotiation .......................... 12 6.4. Usage with Capability Negotiation .......................... 12
6.5. Examples ................................................... 13 6.5. Examples ................................................... 13
7. Security Considerations ...................................... 15 7. Security Considerations ...................................... 15
8. IANA Considerations .......................................... 15 8. IANA Considerations .......................................... 15
9. Informative note on RFC 3388bis .............................. 16 9. Informative note on RFC 3388bis .............................. 16
10. References ................................................... 16 10. References ................................................... 16
10.1. Normative References ....................................... 16 10.1. Normative References ....................................... 16
10.2. Informative References ..................................... 17 10.2. Informative References ..................................... 17
Appendix A. Acknowledgements .................................... 17 Appendix A. Acknowledgements .................................... 18
Authors' Addresses ............................................... 18 Authors' Addresses ............................................... 18
1. Introduction 1. Introduction
An SDP session description may contain one or more media An SDP session description may contain one or more media
descriptions, each identifying a single media stream. A media descriptions, each identifying a single media stream. A media
description is identified by one "m=" line. Today, if more than one description is identified by one "m=" line. Today, if more than one
"m=" lines exist indicating the same media type, a receiver cannot "m=" lines exist indicating the same media type, a receiver cannot
identify a specific relationship between those media. identify a specific relationship between those media.
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The following semantics have been registered by IANA in Semantics for The following semantics have been registered by IANA in Semantics for
the "depend" SDP Attribute under SDP Parameters: the "depend" SDP Attribute under SDP Parameters:
Semantics of the "depend" SDP attribute: Semantics of the "depend" SDP attribute:
Semantics Token Reference Semantics Token Reference
---------------------------- ----- --------- ---------------------------- ----- ---------
Layered decoding dependency lay RFC XXXX Layered decoding dependency lay RFC XXXX
Multi descriptive decoding dependency mdc RFC XXXX Multi descriptive decoding dependency mdc RFC XXXX
New registrations for semantics of the "depend" SDP attribute are
added by the "Specification Required" policy as defined in [RFC5226].
9. Informative note on RFC 3388bis 9. Informative note on RFC 3388bis
Currently, there is ongoing work on [I-D.ietf-mmusic-rfc3388bis]. In Currently, there is ongoing work on [I-D.ietf-mmusic-rfc3388bis]. In
[I-D.ietf-mmusic-rfc3388bis], the grouping mechanism is extended in a [I-D.ietf-mmusic-rfc3388bis], the grouping mechanism is extended in a
way that a media description can be part of more than one group of way that a media description can be part of more than one group of
the same grouping type in the same session description. However, the same grouping type in the same session description. However,
media descriptions grouped by this draft must be at most part of one media descriptions grouped by this draft must be at most part of one
group of the type "DDP" in the same session description. group of the type "DDP" in the same session description.
10. References 10. References
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Jacobson, "RTP: A Transport Protocol for Real-Time Jacobson, "RTP: A Transport Protocol for Real-Time
Applications", STD 64, RFC 3550, July 2003. Applications", STD 64, RFC 3550, July 2003.
[RFC3551] Schulzrinne, H., and S. Casner, "RTP Profile for Audio and [RFC3551] Schulzrinne, H., and S. Casner, "RTP Profile for Audio and
Video Conferences with Minimal Control", STD 65, RFC 3551, Video Conferences with Minimal Control", STD 65, RFC 3551,
July 2003. July 2003.
[RFC3711] Baugher, M., McGrew, D., Naslund, M., Carrara, E., and K. [RFC3711] Baugher, M., McGrew, D., Naslund, M., Carrara, E., and K.
Norrman, "The Secure Real-time Transport Protocol (SRTP)", Norrman, "The Secure Real-time Transport Protocol (SRTP)",
RFC 3711, March 2004. RFC 3711, March 2004.
[RFC4566] Handley, M., Jacobson, V, and C. Perkins, "SDP: Session [RFC4566] Handley, M., Jacobson, V, and C. Perkins, "SDP: Session
Description Protocol", RFC 4566, July 2006. Description Protocol", RFC 4566, July 2006.
[RFC5226] Narten, T., and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP26, RFC5226, May
2008
[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax [RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 5234, January 2008. Specifications: ABNF", RFC 5234, January 2008.
10.2. Informative References 10.2. Informative References
[I-D.ietf-avt-rtp-svc] [I-D.ietf-avt-rtp-svc]
Wenger, S., Wang Y.-K., T. Schierl and A. Eleftheriadis, Wenger, S., Wang Y.-K., T. Schierl and A. Eleftheriadis,
"RTP Payload Format for SVC Video", "RTP Payload Format for SVC Video",
draft-ietf-avt-rtp-svc-18 (work in progress), March draft-ietf-avt-rtp-svc-18 (work in progress), March
2009. 2009.
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