Symmetric RTP / socket reuse flag

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Symmetric RTP / socket reuse flag

Renaud Schoonbroodt
Hi everyone,

I am implementing a SIP user agent (softphone) in C++ where the media
encoding and decoding is handled by ffmpeg.  I basically have one PCMU
encoder and one PCMU decoder. Taken separately they both works fine.

To cope with NAT traversal issues, I need to do Symmetric RTP
https://tools.ietf.org/html/rfc4961

Basically it means that my encoder and decoder need to use the same port.
But when I enable both encoder and decoder one fails I guess because the
port can't be reused.  Again, enabled separately it works like a charm.

I see the existence of the "reuse_socket" AVOption for UDP socket. But I
have very little experience with the ffmpeg API and don't know how to
access UDPContext form an AVFormatContext or AVCodecContext.

I have also seen the "reuse" flag for URL but it doesn't seem to work with
RTP.

Does someone already succeed in doing this ?  Am I looking in the right
direction ?

Thanks

Best regards,

Renaud
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