AEC回声抑制算法
这个比较难目前可以使用directsound进行处理不过只能在xp下使用别
系统不支持！目前gips对本算法有出色实现skype就是使用该引擎！要想自己实现恐怕很困难！ AEC 模块是 Microsoft DirectSound 底层结构
部分
该组件包括下列特性和限制: AEC只在不超过 25×15×9 英尺
小房间才会有效； AEC只对单声道有效当输出是多个通道立体声时候只有个通道能够具有回波抵消效果； AEC不能抵消来自其它声音源声音比如背景中收音机放出来歌曲； IDirectSoundFullDuplex8* DirectSoundFD;// IDirectSoundCaptureBuffer8* DirectSoundCaptureBuf8;//捕捉缓冲区接口指针 IDirectSoundBuffer8* DirectSoundBuf8;//回放缓冲区接口指针 IDirectSoundBuffer8* pIUnkown;//回放缓冲区接口指针 extern "C" const GUID IID_IDirectSoundBuffer8 = {0x6825a449, 0x7524, 0x4d82,{ 0x92, 0x0f, 0x50, 0xe3, 0x6a, 0xb3, 0xab, 0x1e}}; extern "C" const GUID GUID_DSCFX_MS_NS = {0x11c5c73b, 0x66e9, 0x4ba1, {0xa0, 0xba, 0xe8, 0x14, 0xc6, 0xee, 0xd9, 0x2d}}; extern "C" const GUID GUID_DSCFX_CLASS_NS = {0xe07f903f, 0x62fd, 0x4e60, {0x8c, 0xdd, 0xde, 0xa7, 0x23, 0x66, 0x65, 0xb5}}; extern "C" const GUID GUID_DSCFX_MS_AEC = {0xcdebb919, 0x379a, 0x488a, {0x87, 0x65, 0xf5, 0x3c, 0xfd, 0x36, 0xde, 0x40}}; extern "C" const GUID GUID_DSCFX_CLASS_AEC = {0xBF963D80L, 0xC559, 0x11D0, {0x8A, 0x2B, 0x00, 0xA0, 0xC9, 0x25, 0x5A, 0xC1}}; extern "C" const GUID DAlgorithm ={0x00000000, 0x0000, 0x0000, {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}};
//1.创建及
化DirectSound WAVEFORMATEX WaveDataFormat={WAVE_FORMAT_PCM, 1,8000,16000,2,16, 0}; //回放缓冲区render buffer DSBUFFERDESC desc; mem
(&desc, 0, 
(desc)); desc.dwSize = (desc); desc.dwFlags = DSBCAPS_CTRLFX | DSBCAPS_GLOBALFOCUS; desc.dwBufferBytes = 2000 * NUM_REC_NOTIFICATIONS;//待定 desc.dwReserved = 0; desc.lpwfxFormat = &WaveDataFormat; //捕捉缓冲区AEC和NS效果
DSCEFFECTDESC efft[2]; mem(efft, 0, (efft)); //AEC效果 efft[0].dwSize = (efft[0]); efft[0].dwFlags = DSCFX_LOCSOFTWARE; efft[0].guidDSCFXClass = GUID_DSCFX_CLASS_AEC; efft[0].guidDSCFXInstance = GUID_DSCFX_MS_AEC; //NS效果 efft[1].dwSize = (efft[1]); efft[1].dwFlags = DSCFX_LOCSOFTWARE; efft[1].guidDSCFXClass = GUID_DSCFX_CLASS_NS; efft[1].guidDSCFXInstance = GUID_DSCFX_MS_NS; //捕捉缓冲区capture buffer DSCBUFFERDESC cdesc; mem(&cdesc, 0, (cdesc)); cdesc.dwSize = (cdesc); cdesc.dwFlags = DSCBCAPS_CTRLFX; cdesc.dwBufferBytes = 2000 * NUM_REC_NOTIFICATIONS;//待定 cdesc.lpwfxFormat = &WaveDataFormat; cdesc.dwFXCount = 2; cdesc.lpDSCFXDesc = efft; HWND win = AfxGetApp
->m_pMainWnd->m_hWnd; hr = DirectSoundFullDuplexCreate8(0, 0,&cdesc, &desc,win, DSSCL_PRIORITY,&DirectSoundFD, &DirectSoundCaptureBuf8,&DirectSoundBuf8, 0); DXTRACE_ERR( TEXT("DirectSoundFullDuplexCreate8"), hr ); //成功创建DirectSoundFDDirectSoundCaptureBuf8DirectSoundBuf8均不为零 
(!FAILED(hr)) DirectSoundFD->QueryInterface(IID_IDirectSoundBuffer8, (void**)pIUnkown); //发现上面pIUnkown=0查询失败为什么？ AfxMessageBox("失败");
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