2020.01.10:
- Made sure that each "TaskToken" is set to NULL when its scheduled event occurs, to ensure that
"unscheduleDelayedTask()" is never later called with it. Also, because "unscheduleDelayedTask()"
sets its "TaskToken&" parameter to NULL, there's no need to do this explicitly outside the call.
(Thanks to Helmut Grohne for proposing this.)
2020.01.09:
- Improved the "MediaSession"/"MediaSubsession" SDP parsing code by moving replicated code into a
single function. (We also now parse the "key-mgmt" SDP attribute, although we don't yet use it.)
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