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SDP attributes defined in RFC 6236

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Negotiation of Generic Image Attributes
imageattr

RFC 6236 – Section 3

a=imageattr:   (media-level)


attribute   =/
image-attr   =
"imageattr:"   PT   1*2( 1*WSP   ( "send"    /  "recv" )   1*WSP   attr-list )

PT   =
1*DIGIT  /  "*"

attr-list   =
( set   *( 1*WSP   set ) )  /  "*"

set   =
"["   "x="   xyrange   ","   "y="   xyrange   *( ","   key-value )   "]"

key-value   =
( "sar="   srange )  /  ( "par="   prange )  /  ( "q="   qvalue )

onetonine   =
"1"  /  "2"  /  "3"  /  "4"  /  "5"  /  "6"  /  "7"  /  "8"  /  "9"

xyvalue   =
step   =
xyrange   =
( "["   xyvalue   ":"   [ step   ":" ]   xyvalue   "]" )  /
( "["   xyvalue   1*( ","   xyvalue )   "]" )  /
( xyvalue )

spvalue   =
( "0"   "."   onetonine   *3DIGIT )  /
( onetonine   "." 1*4DIGIT )

srange   =
( "["   spvalue   1*( ","   spvalue )   "]" )  /
( "["   spvalue   "-"   spvalue   "]" )  /
( spvalue )

prange   =
( "["   spvalue   "-"   spvalue   "]" )

qvalue   =
( "0"   "."   1*2DIGIT )  /
( "1"   "."   1*2( "0" ) )
;  Values between 0.00 and 1.00