You might want to start here: https://github.com/pulseaudio/pulseaudio/tree/master/src/modules/echo-cancel https://github.com/pulseaudio/pulseaudio/tree/master/

You might want to start here: https://github.com/pulseaudio/pulseaudio/tree/master/src/modules/echo-cancel https://github.com/pulseaudio/pulseaudio/tree/master/src/mod... It would be very interesting to port that code. Another option, obviously, is to use a Raspberry Pi instead with pulseaudio and module-echo-cancel enabled.