Carine Liang
2006-Oct-30 21:08 UTC
[Speex-dev] Integrating speex with VideoNet application: Constant background noise
Hi, I am developing a peer-to-peer video conference application which uses speex as a codec for the voice. I am new to speex, so please bear with me if I asked the obvious. After I added the encode and decode function to my MFC app, I heard a constant background noise, even when no one is speaking into the microphone. #define FRAME_SIZE 160 The application is coded in MFC C++. The record buffer is set to be the same as the FRAME_SIZE such that my callback function is called everytime 160 bytes of data is recorded. Here's what I did in the initialisation (called only once). m_waveFormatEx.wFormatTag =WAVE_FORMAT_PCM; m_waveFormatEx.nChannels =1; m_waveFormatEx.wBitsPerSample =8; m_waveFormatEx.cbSize =0; m_waveFormatEx.nSamplesPerSec = 8000; m_waveFormatEx.nBlockAlign =1; m_waveFormatEx.nAvgBytesPerSec = 8000; int quality =8; speex_bits_init(&bits); enc_state = speex_encoder_init(&speex_nb_mode); speex_encoder_ctl(enc_state, SPEEX_SET_QUALITY, &quality); In my recording callback function LRESULT RecordSound::OnSoundData(WPARAM wParam, LPARAM lParam) { .... dataPtr = (char *)lpHdr ->lpData; dataSize = (int)lpHdr ->dwBytesRecorded; for(int k=0;k<FRAME_SIZE;k++) input[k] = dataPtr[k]; //input is float[FRAME_SIZE] speex_bits_reset(&bits); speex_encode(enc_state, input, &bits); encByte = speex_bits_write(&bits, cbits, 200); //send cbits to peer computer via sockets } In the receiver's initialization function, I've initialized the speex_decoder. speex_bits_init(&bits); dec_state = speex_decoder_init(&speex_nb_mode); In the receiver's socket function, it reads from socket and store the data in cbits (char array). { speex_bits_read_from(&bits, cbits, retvalue); //retvalue is 38 speex_decode(dec_state, &bits, output); //where output is float array for(int k=0;k<FRAME_SIZE;k++) out[k] = output[k]; //out is a char array PostThreadMessage( WM_PLAYSOUND_PLAYBLOCK, FRAME_SIZE, (LPARAM)out ); } __________________________________ What will the world find in 2020? Leave a part of your 2006 in the Yahoo! Time Capsule. Contribute now! http://timecapsule.yahoo.com/capsule.php?intl=sg -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20061030/08ce83ea/attachment.htm
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