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Session Description  Addressing  generic rules  "a=" SDP Attributes
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SDP attributes defined in

RFC 6236 – Negotiation of Generic Image Attributes

RFC 6236 – Section 3
a=imageattr

 

attribute  =/
image‑attr
image-attr =
"imageattr:"  PT  1*2( 1*WSP  ( "send"  /  "recv" )  1*WSP  attr‑list )
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PT =
1*DIGIT /  "*"
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attr-list =
( set  *( 1*WSP  set ) ) /  "*"
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set =
"["  "x="  xyrange  ","  "y="  xyrange  *( ","  key‑value )  "]"
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key-value =
( "sar="  srange ) /  ( "par="  prange ) /  ( "q="  qvalue )
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xyrange =
( "["  xyvalue  ":"  [ step  ":" ]  xyvalue  "]" ) / 
( "["  xyvalue  1*( ","  xyvalue )  "]" ) / 
( xyvalue )
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step =
xyvalue
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xyvalue =
onetonine  *5DIGIT
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srange =
( "["  spvalue  1*( ","  spvalue )  "]" ) / 
( "["  spvalue  "-"  spvalue  "]" ) / 
( spvalue )
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prange =
( "["  spvalue  "-"  spvalue  "]" )
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qvalue =
( "0"  "."   1*2DIGIT ) / 
( "1"  "."  1*2( "0" ) )
; Values between 0.00 and 1.00
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spvalue =
( "0"  "."  onetonine  *3DIGIT ) / 
( onetonine  "." 1*4DIGIT )
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onetonine =
"1" /  "2" /  "3" /  "4" /  "5" /  "6" /  "7" /  "8" /  "9"
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