[Linphone-developers] how to using speex lib to cancel echo in IP phone?

[张贝芬]

Hi:
 I am developing an IP Phone on ARM(samsung 6410; CPU:667MHZ), and use lib mediastreamer.2.6.0 for audio  communication, but now the echo occur while talking. In the lib mediastreamer.2.6.0, I find a filter can  do echo Cancellation by calling lib speex. I active it to filter the collected voice, but the telephone  receiver can't hear any voice. Maybe I setup parameters wrong, the parameters are as follow:

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

 int ec_tail_len = 100;
 int ec_delay = 20;
 int ec_framesize = 0;
 if (use_ec) {
  stream->ec=ms_filter_new(MS_NEW_SPEEX_EC_ID);
  ms_filter_call_method(stream->ec,MS_FILTER_NEW_SET_SAMPLE_RATE,&pt->clock_rate);
  //inec_tail_len = 100;
  //ec_delay = ;
  if (ec_tail_len!=0)
   ms_filter_call_method(stream->ec,MS_ECHO_CANCELLER_SET_TAIL_LENGTH,&ec_tail_len);
  if (ec_delay!=0)
   ms_filter_call_method(stream->ec,MS_ECHO_CANCELLER_SET_DELAY,&ec_delay);
  if (ec_framesize!=0)
   ms_filter_call_method(stream->ec,MS_ECHO_CANCELLER_SET_FRAMESIZE,&ec_framesize);
 }

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    Expecting anybody can give me some advices to cancel the hateful echo.
    Best regards!

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