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SDP attributes defined in RFC 4585

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Real-time Transport Control Protocol (RTCP)-based Feedback
rtcp-fb

RFC 4585 – Section 4.2

Errata ID: 2853

Errata ID: 3313

a=rtcp-fb:   (media-level)


attribute-fields   =/
rtcp-fb-syntax   =
"a=rtcp-fb:"   rtcp-fb-pt   SP   rtcp-fb-val   CRLF

rtcp-fb-pt   =
"*"  /  fmt
;  wildcard: applies to all formats

rtcp-fb-val   =
"ack"   rtcp-fb-ack-param  /
"nack"   rtcp-fb-nack-param  /
"trr-int"   SP   1*DIGIT  /
rtcp-fb-id   rtcp-fb-param  /
"ccm"   rtcp-fb-ccm-param     ;  see   RFC 5104 – Section 7.1

rtcp-fb-id   =
1*( alpha-numeric  /  "-"  /  "_" )

rtcp-fb-param   =
[
SP   "app"   [ SP   byte-string ]  /
SP   token   [ SP   byte-string ]
]

rtcp-fb-ack-param   =
SP   "rpsi"  /
SP   "app"   [ SP   byte-string ]  /
SP   token   [ SP   byte-string ]

rtcp-fb-nack-param   =
[
SP   "pli"  /
SP   "sli"  /
SP   "rpsi"  /
SP   "app"   [ SP   byte-string ]  /
SP   "tllei"  /     ;  see  RFC 6642 – Section 8
SP   "pslei"  /     ;  see  RFC 6642
SP   "rai"  /     ;  see  RFC 6285 – Section 8
SP   "ecn"  /     ;  see  RFC 6679 – Section 10.3
SP   token   [ SP   byte-string ]
]

; See:  ack and nack attribute values IANA Registry


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
SP   token   [ SP   byte-string ]     ;  for future commands/indications

MaxPacketRateValue   =
1*15DIGIT

subMessageType   =
1*8DIGIT