Echo cancellation gstreamer, android NDK

[Puyol]

Hello,
I took the solution from this link 
"http://stackoverflow.com/questions/12748277/speex-echo-cancellation-configuration"
the problem is that i have to use :
SpeexEchoState *st;
SpeexPreprocessState *den;
Did any one know from what file it is included?
thanks



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