[Libav-user] Fill audio gap with silence in demuxer

[lagavulin2016]

I'm implementing voip pcap demuxer.
For example, if I have a voip(sip+rtp) pcap file which contains bidirectional conversation.
I want to create a wav file from it.
The problem is...
If there are packet drops, the gap should be filled with silence so it is synced with other direction.
How can I fill the gap in my demuxer(libavformat level, not codec level)?
Or is there some audio filter or flag I can use? 
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