webrtc: Add the ability to set the DSCP markings based on the priority

Merged Olivier Crête requested to merge ocrete/gst-plugins-bad:webrtc-dscp into master

Sets the DSCP markings (the Type of Service / TClass IP header fields) based on the priority of each stream as specified by the user.

The depends on gst-plugins-good!666 (merged) and you can test it using gst-examples!18 (merged)

Edited by Olivier Crête

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