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ABNF for SDP – Session Description Protocol

|   Session Description   |   v=   |   o=   |   s=   |   i=   |   u=   |   e=   |   p=   |   c=   |   b=   |   t=  r=  z=   |   k=   |   a=   |   m=   |   SDP Addressing   |   SDP generic rules   |   "a=" SDP Attributes   |

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a=fec-source-flow:   (media-level)
a=fec-repair-flow:   (media-level)
a=repair-window:   (media-level)


attribute-fields   =/
fec-repair-flow-line   =
"a=fec-repair-flow:"   SP   fec-encoding-id   [ ";"   SP   flow-preference ]
[ ";"   SP   sender-side-scheme-specific ]   [ ";"   SP   scheme-specific ]   CRLF

fec-encoding-id   =
"encoding-id="   enc-id

enc-id   =
1*DIGIT

flow-preference   =
"preference-lvl="   preference-level-of-the-flow

preference-level-of-the-flow   =
1*DIGIT

sender-side-scheme-specific   =
"ss-fssi="   sender-info

sender-info   =
element   *( ","   element )

element   =
name   ":"   value

name   =
token   =
1*<any CHAR except CTLs or separators>

value   =
*<any CHAR except CTLs or separators>

separator   =
"("  /  ")"  /  "<"  /  ">"  /  "@"   /
","  /  ";"  /  ":"  /  "\"  /  DQUOTE   /
"/"  /  "["  /  "]"  /  "?"  /  "="   /
"{"  /  "}"  /  SP  /  HTAB

scheme-specific   =
"fssi="   scheme-info

scheme-info   =
element   *( ","   element )

repair-window-line   =
"a=repair-window:"   window-size   unit   CRLF

window-size   =
%x31-39   *DIGIT
;  represented as 32-bit non-negative integers

unit   =
"ms"  /  "us"

fec-source-flow-line   =
"a=fec-source-flow:"   SP   source-id   [ ";"   SP   tag-length ]   CRLF

source-id   =
"id="   src-id

src-id   =
1*DIGIT
;  represented as 32-bit non-negative integers, and leading zeros are ignored

tag-length   =
"tag-len="   tlen

tlen   =
%x31-39   *DIGIT

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