Commit 831b1249 authored by Jakub Adam's avatar Jakub Adam Committed by Matthew Waters

webrtcbin: Support data channel SDP offers from Chrome

When negotiating a data channel, Chrome as recent as 75 still uses SDP
based on version 05 of the SCTP SDP draft, for example:

 m=application 9 DTLS/SCTP 5000
 a=sctpmap:5000 webrtc-datachannel 1024

Implement support for parsing SCTP port out of SDP message with sctpmap
attribute. Fixes data channel negotiation with Chrome browser.
parent 2c124433
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