SILK codec for pjmedia

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Hi guys,

Just to share that if anybody is interested to have SILK codec running 
with pjsip I've just done some piece of work on CSipSimple (an android 
app that use pjsip stack).

That's my very first codec so be indulgent. For now it works but no more .
I've tested 8kHz, 16kHz and 24kHz sucessfuly with a Freeswitch on the 
other side.
PLC is not done (while should be supported by SILK).
VAD is not done (but I'm not sure that's not already done by SILK itself 
so maybe not worth to add this on pjmedia glue side).

As I don't need standard makefile environment for android and I'm very 
lazy, you'll probably have to do the makefile stuff yourself if you'd 
like to run on another platform, but well... one file to modify .
The file is released under apache license but I'd *really* appreaciate 
if somebody wants to contribute to this code (I'm far to be a C expert 
so it's probably full of mistake or of missing checks).

The link to the interesting commit :
http://code.google.com/p/csipsimple/source/detail?r=543

(Base is a latest trunk of pjsip -- if I didn't miss a commit ).

I use the SILK FIX point implementation but I guess that it could be 
adapted for their floating point or ARM implementation provided by Skype.





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