draft-ietf-mmusic-image-attributes-05.txt   draft-ietf-mmusic-image-attributes-06.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: December 5, 2010 Samsung Electronics Co., Ltd. Expires: December 16, 2010 Samsung Electronics Co., Ltd.
June 3, 2010 June 14, 2010
Negotiation of Generic Image Attributes in SDP Negotiation of Generic Image Attributes in SDP
draft-ietf-mmusic-image-attributes-05 draft-ietf-mmusic-image-attributes-06
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
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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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 December 5, 2010. This Internet-Draft will expire on December 16, 2010.
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
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publication of this document. Please review these documents publication of this document. Please review these documents
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The syntax for the image attribute is in ABNF [RFC5234]: The syntax for the image attribute is in ABNF [RFC5234]:
---- ----
image-attr = "imageattr:" PT 1*2( 1*WSP ( "send" / "recv" ) image-attr = "imageattr:" PT 1*2( 1*WSP ( "send" / "recv" )
1*WSP attr-list ) 1*WSP attr-list )
PT = 1*DIGIT / "*" PT = 1*DIGIT / "*"
attr-list = ( set *(1*WSP set) ) / "*" attr-list = ( set *(1*WSP set) ) / "*"
---- ----
---- ----
set= "[" "x=" xyrange "," "y=" xyrange [ ",=" key-value ] "]" set= "[" "x=" xyrange "," "y=" xyrange *( "," key-value ) "]"
; x is the horizontal image size range (pixel count) ; x is the horizontal image size range (pixel count)
; y is the vertical image size range (pixel count) ; y is the vertical image size range (pixel count)
key-value = ( "sar=" srange ) key-value = ( "sar=" srange )
/ ( "par=" prange ) / ( "par=" prange )
/ ( "q=" qvalue ) / ( "q=" qvalue )
; Key-value MAY be extended with other keyword parameters. ; Key-value MAY be extended with other keyword parameters.
; At most one instance each of sar, par, or q in a set. ; At most one instance each of sar, par, or q in a set.
; ;
; sar (sample aspect ratio) is the sample aspect ratio ; sar (sample aspect ratio) is the sample aspect ratio
; associated with the set (optional and MAY be ignored) ; associated with the set (optional and MAY be ignored)
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