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ABNF for SDP
RFC 4566and many other RFCs

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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SDP attributes defined in

RFC 4585 – RTCP-based Feedback

RFC 4585Section 4.2  —  Errata ID: 2853Errata ID: 3313  —  see also:  IANA

 


attribute-fields  =/
rtcp-fb-syntax =
"a=rtcp-fb:"  rtcp-fb-ptSPrtcp-fb-valCRLF
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rtcp-fb-pt =
"*" /  fmt
; wildcard: applies to all formats
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rtcp-fb-val =
"ack"  rtcp-fb-ack-param / 
"nack"  rtcp-fb-nack-param / 
"trr-int"  SP  1*DIGIT / 
rtcp-fb-idrtcp-fb-param  /
"ccm"  rtcp-fb-ccm-param     ; see   RFC 5104Section 7.1
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rtcp-fb-id =
1*( alpha-numeric /  "-" /  "_" )
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rtcp-fb-param =
[
SP  "app"  [ SPbyte-string ] / 
SPtoken  [ SPbyte-string ]
]
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rtcp-fb-ack-param =
SP  "rpsi" / 
SP  "app"  [ SPbyte-string ] / 
SPtoken  [ SPbyte-string ]
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rtcp-fb-nack-param =
[
SP  "pli"  /
SP  "sli"  /
SP  "rpsi"  /
SP  "app"  [ SPbyte-string ]  /
SP  "tllei"  /     ; see   RFC 6642Section 8
SP  "pslei"  /     ; see  RFC 6642
SP  "rai"  /     ; see   RFC 6285Section 8
SP  "ecn"  /     ; see   RFC 6679Section 10.3
SPtoken  [ SPbyte-string ]
 ]
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rtcp-fb-ccm-param =
SP  "fir"   /     ; Full Intra Request
SP   "tmmbr"      ; Temporary max media bit rate
SP  "smaxpr="  MaxPacketRateValue ]   /
SP  "tstr"   /     ; Temporal-Spatial Trade-Off
SP  "vbcm"  *( SP   subMessageType )   /     ; H.271 VBCMs
SPtoken  [ SPbyte-string ]     ; for future commands/indications
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MaxPacketRateValue =
1*15DIGIT
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subMessageType =
1*8DIGIT
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