[Speex-dev] ACE does not work for me at all.

[dongwen]

No matter I speex_echo_playback the received voice data(from far end) right
before it's played by waveout or right after it's played, it cann't cancel
any echo.

I read the documentation again and again,found I am indeed following the
instruction.

2010/6/28 <fanchuan0077 at gmail.com>

> Hello, all.
>
> 1) ACE does not work for me
> I am in a voip project using Speex, failed to have hte Speex ACE work. here
> is how I initialize it:
> /**
> * Configurations :
> * #define BITS_PER_SAMPLE (16)
> * #define SAMPLE_RATE (8000)
> * #define CHANNEL_NB (1)
> * #define DURATION (20)
> * SPEEX_MODEID_NB
> */
> _eco_state = speex_echo_state_init(_encframe_size, 10*_encframe_size);
> speex_echo_ctl(_eco_state, SPEEX_ECHO_SET_SAMPLING_RATE, &_sample_rate);
>
> _den_state = speex_preprocess_state_init(_encframe_size, _sample_rate);
> speex_preprocess_ctl(_den_state, SPEEX_PREPROCESS_SET_ECHO_STATE,
> _eco_state);
>
> tmp=1;
> speex_preprocess_ctl(_den_state, SPEEX_PREPROCESS_SET_DENOISE, &tmp);
> tmp=1;
> speex_preprocess_ctl(_den_state, SPEEX_PREPROCESS_SET_AGC, &tmp);
> ftmp=24000; // actually default is 8000(0,32768),here make it louder for
> voice is not loudy enough by default. 8000
> speex_preprocess_ctl(_den_state, SPEEX_PREPROCESS_SET_AGC_LEVEL, &ftmp);
> tmp=1;
> speex_preprocess_ctl(_den_state, SPEEX_PREPROCESS_SET_VAD, &tmp);
>
> and following is how I cancel echo:
>
> I have a player class and a recorder class using windows wavein and waveout
> with waveInProc and waveOutProc event handlers
>
> void __stdcall WFAudioPlayer::WaveOutProc(HWAVEOUT hWaveOut,UINT uMsg,DWORD
> dwInstance,DWORD dwParam1,DWORD dwParam2)
> {
> if(uMsg != WOM_DONE)
> return;
>
> WFAudioPlayer* player = reinterpret_cast<WFAudioPlayer*>(dwInstance);
>
> if (player)
> {
> // get the frame to be played back next.
> tByte* nextframe = player->GetNextBlockFrame();
>
> /**
> * No matter the following two lines are commented or not, the voip
> performances are the same, with echo.
> */
> // make speex AEC buffer it for echo cancellation for recorder
> if (nextframe)
> player->GetConverter()->SpeexEchoPlayback(nextframe);
> }
> ......
> }
>
> void WFAudioRecorder::ProcessRecordedFrame(tByte* record)
> {
> static tUInt32 timestamp_counter = 0;
>
> // cancel echo
> _converter->SpeexEchoCapture(record,_echooutframe);
>
> //preprocess
> _converter->SpeexPreprocessRun(_echooutframe);
> ........
> }
> and ACE seems not work for me at all. I don't know why. the voices are the
> same whether I cancel echo or not,full of echos.
>
> Any help would be appreciated, thanks.
>
> 2)
> BTW speex_echo_state_destroy crashes if the echo state was initialized with
> filter length 0.
> _eco_state = speex_echo_state_init(_encframe_size, 0);
> I know it's unreasonable to make filter length 0, but crash is
> unacceptable, I think.




-- 
B.r
Sincerly Dongwen
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20100628/16c9155d/attachment.htm