Support Opus in WireShark

[ryanlee () mail ustc edu cn]

Hello everyone


Because Opus is a totally open audio codec and very useful, I want to make WireShark support Opus so that the WireShark 
can play Opus audio RTP stream and save. Ihadsomeattempts.PuttheOpusintotheplugins/codecs. 
NowWireSharkcanplayandsaveOpusaudioRTPstreamliketheg711, g722. TosupportOpusandFEC(ForwardErrorCorrection), 
Ichangedsomecode：


Here is the change:
1、Change a function with C++ default parameters 
Origin version:   size_t convert_payload_to_samples(unsigned int payload_type, QTemporaryFile *tempfile, uint8_t 
*pd_out, size_t expected_nchars, struct _GHashTable *decoders_hash ); 
     MyChanged version:  size_t convert_payload_to_samples(unsigned int payload_type, QTemporaryFile *tempfile, uint8_t 
*pd_out, size_t expected_nchars, struct _GHashTable *decoders_hash , size_t fecflag = 0);
2、Add some codes to support OPus fec、play and save.In my opinion these codes don't affect other functions.(In the 
files: rtp_audio_stream.cpp   rtp_audio_stream.cpp )


I don't know whether the change is useful and meets specifications.


The other　question:  In the RTP protocol, Opus don't have a fixed payload type.  Now I write the payload type into 
macro. DoesithaveagoodwaytoletuserchoosetheOpuspayloadtype? Althoughtried ,Ifailed~~ I don'tknowhowtorealizeit. 


It is my first time to participate in a open source project. And I want to make a contribution. I don't know whether it 
is a good way to plugin Opus into WireShark or not. If  not , is there a better way?  I want to know and try it!  


    Best regards,



    Ryan Lee

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