Echo cancellation

Can any of you suggest a good and stable echo cancelation package (gnu or not) to be linked with my videoconference application (C/C++) (Windows / Linux / MacOSX) ? My application should be freeware, so i do not want to pay for each user who downlo开发者_Python百科ad the app.

Oslec is the best I know of. Might also look into the speex codec stack which includes an echo canceller.

I've used Speex AEC successfully in 2 different VoIP applications. You might be interested in the Speex dev group if issues arise.