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SDP attributes defined in RFC 5583

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Signaling Media Decoding Dependency
depend

RFC 5583 – Section 5.2.2

a=depend:   (media-level)


attribute-fields   =/
depend-attribute   =
"a=depend:"   dependent-fmt  SP   dependency-tag
*( ";"   SP   dependent-fmt   SP   dependency-tag )   CRLF

dependency-tag   =
dependency-type   *1( SP   identification-tag   ":"   fmt-dependency   *( ","   fmt-dependency ) )

dependency-type   =
"lay"  /  "mdc"  /  token

dependent-fmt   =
fmt

fmt-dependency   =
fmt