draft-ietf-mmusic-image-attributes-07.txt   draft-ietf-mmusic-image-attributes-08.txt 
Network Working Group I. Johansson Network Working Group I. Johansson
Internet-Draft Ericsson AB Internet-Draft Ericsson AB
Intended status: Standards Track K. Jung Intended status: Standards Track K. Jung
Expires: April 1, 2011 Samsung Electronics Co., Ltd. Expires: April 18, 2011 Samsung Electronics Co., Ltd.
Sep 28, 2010 Oct 15, 2010
Negotiation of Generic Image Attributes in SDP Negotiation of Generic Image Attributes in SDP
draft-ietf-mmusic-image-attributes-07 draft-ietf-mmusic-image-attributes-08
Abstract Abstract
This document proposes a new generic session set up attribute to make This document proposes a new generic session set up attribute to make
it possible to negotiate different image attributes such as image it possible to negotiate different image attributes such as image
size. A possible use case is to make it possible for a low-end hand- size. A possible use case is to make it possible for a low-end hand-
held terminal to display video without the need to rescale the image, held terminal to display video without the need to rescale the image,
something that may consume large amounts of memory and processing something that may consume large amounts of memory and processing
power. The draft also helps to maintain an optimal bitrate for video power. The draft also helps to maintain an optimal bitrate for video
as only the image size that is desired by the receiver is as only the image size that is desired by the receiver is
skipping to change at page 1, line 38 skipping to change at page 1, line 38
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
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."
This Internet-Draft will expire on April 1, 2011. This Internet-Draft will expire on April 18, 2011.
Copyright Notice Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the Copyright (c) 2010 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 Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
skipping to change at page 10, line 41 skipping to change at page 10, line 41
* The answerer should not on its own include an image attribute * The answerer should not on its own include an image attribute
in the answer. in the answer.
o Offerer receiving the answer: o Offerer receiving the answer:
* If the image attribute is not included in the SDP answer the * If the image attribute is not included in the SDP answer the
offerer SHOULD continue to process the answer as if this offerer SHOULD continue to process the answer as if this
mechanism had not been offered. mechanism had not been offered.
* If the image attribute is included in the SDP answer but none * If the image attribute is included in the SDP answer but none
of the entries are usable or acceptable, the offerer SHOULD of the entries are usable or acceptable, the offerer MUST
resort to other methods to determine the appropriate image resort to other methods to determine the appropriate image
size. In this case the offerer must also issue a new offer/ size. In this case the offerer must also issue a new offer/
answer without the image attribute to avoid misunderstandings answer without the image attribute to avoid misunderstandings
between offerer and answerer. This will avoid the risk on between offerer and answerer. This will avoid the risk on
infinite negotiations. infinite negotiations.
3.2. Considerations 3.2. Considerations
3.2.1. No imageattr in 1st offer 3.2.1. No imageattr in 1st offer
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guidance in the amazing video-coding world. Special thanks go to guidance in the amazing video-coding world. Special thanks go to
Clinton Priddle, Roni Even, Randell Jesup, and Dan Wing. Clinton Priddle, Roni Even, Randell Jesup, and Dan Wing.
8. Changes 8. Changes
Note to RFC Editor: please replace remove this section in its Note to RFC Editor: please replace remove this section in its
entirety before publication. entirety before publication.
The main changes are: The main changes are:
From WG -07 to WG -08
* SHOULD changed to MUST in section "Offer/answer rules"
From WG -05 to WG -06 & -07 From WG -05 to WG -06 & -07
* Update based on AD review comments, no changes to fix issue * Update based on AD review comments, no changes to fix issue
related to RFC2119 keywords related to RFC2119 keywords
* Minor editorial changes * Minor editorial changes
* Added extra example to use of attribute with SDPCapNeg * Added extra example to use of attribute with SDPCapNeg
From WG -04 to WG -05 From WG -04 to WG -05
 End of changes. 5 change blocks. 
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