DirectShow录不到声音
这是我自己写的一部分录像代码，录出来有画面，但是没有声音
请问是不是缺少了什么步骤？
CHECK_RESULT和SAFE_RELEASE是我自己写的宏
CHECK_RESULT(m_pGBuilder->AddFilter(m_pComprsFilter,L"Compress")); CHECK_RESULT(m_pGBuilder->AddFilter(m_pAudioFilter,L"Audio")); CHECK_RESULT(m_pCGBuilder2->SetOutputFileName(&MEDIASUBTYPE_Avi,L"C:\\test2.avi", &m_pMuxFilter,NULL)); CHECK_RESULT(m_pCGBuilder2->RenderStream(&PIN_CATEGORY_CAPTURE,&MEDIATYPE_Audio, m_pAudioFilter,NULL,this->m_pMuxFilter)); //链接接口 CHECK_RESULT(m_pCGBuilder2->RenderStream(&PIN_CATEGORY_CAPTURE,&MEDIATYPE_Video, m_pVideoFilter,m_pComprsFilter,this->m_pMuxFilter)); //获取IFileSinkFilter接口进行设置 IConfigAviMux *pConfig = NULL; CHECK_RESULT(m_pMuxFilter->QueryInterface(IID_IConfigAviMux,(void**)&pConfig)); pConfig->SetMasterStream(0); SAFE_RELEASE(pConfig); m_pMCtrlCam->Run();
ICaptureGraphBuilder2 * pBuilder = NULL;
pGraph = NULL;
pMediaControl = NULL;
/***********************列举视频设备**************************/
ICreateDevEnum *pDevEnum = NULL;
CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC,
IID_ICreateDevEnum, (void **)&pDevEnum);
IEnumMoniker *pClassEnum = NULL;
pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pClassEnum, 0);
if (pClassEnum==NULL)
{
MessageBox(_T("你机器上没装有任何视频捕获设备?"));
return;
}
ULONG cFetched;
BOOL bFind=FALSE;
while (pClassEnum->Next(1, &pMoniker, &cFetched) == S_OK)
{
VARIANT var;
VariantInit(&var);
WCHAR szName[50]={0};
IPropertyBag *pBag=0;
HRESULT hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);
hr = pBag->Read(L"FriendlyName", &var, 0);
pBag->Release();
if(SUCCEEDED(hr))
{
SysFreeString(var.bstrVal);
// Bind the moniker to a filter object.
pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pSrc);
pMoniker->Release();
bFind=TRUE;
break;
}
pMoniker->Release();
}
pClassEnum->Release();
if (!bFind)
return;
/***********************列举视频设备**************************/
/***********************列举音频设备开始**************************/
CString strAudioName;
ASSERT(pDevEnum != NULL);
HRESULT hr = pDevEnum->CreateClassEnumerator(CLSID_AudioInputDeviceCategory, &pClassEnum, 0);
pDevEnum->Release();
if(hr != NOERROR)
return;
pClassEnum->Reset();
while(hr = pClassEnum->Next(1, &pMoniker, &cFetched), hr==S_OK)
{
IPropertyBag *pBag;
hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);
if(SUCCEEDED(hr))
{
VARIANT var;
var.vt = VT_BSTR;
hr = pBag->Read(L"FriendlyName", &var, NULL);
pBag->Release();
if(hr == NOERROR)
{
CString strTemp(var.bstrVal);
strAudioName = strTemp;
SysFreeString(var.bstrVal);
// Bind the moniker to a filter object.
pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pAudioSrc);
pMoniker->Release();
break;
}
pMoniker->Release();
}
}
pClassEnum->Release();
/***********************列举音频设备结束**************************/
/**************************创建过滤器*************************/
CoCreateInstance(CLSID_CaptureGraphBuilder2,0,CLSCTX_INPROC_SERVER,IID_ICaptureGraphBuilder2,(void**)&pBuilder);
CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void **)&pGraph);
pBuilder->SetFiltergraph(pGraph);
pGraph->AddFilter(pSrc,L"VideoCapture");
pGraph->AddFilter(pAudioSrc,(LPCWSTR)strAudioName.GetBuffer(0));
pGraph->QueryInterface(IID_IMediaControl,(void**)&pMediaControl);
if (!GetVideoCompressor())
{
MessageBox(_T("创建视频编码器失败"));
return;
}
if (!GetAudioCompressor())
{
MessageBox(_T("创建音频编码器失败"));
return;
}
hr = pGraph->AddFilter(pVComp, L"Video Encoder");
if(FAILED(hr))
{
AfxMessageBox(TEXT("Could not add selected compressor to the graph.\r\n\r\n")
TEXT("The input file format may not be compatible with the selected encoder.\r\n")
TEXT("Some encoders (like Windows Media encoders or DRM-enabled encoders)\r\n")
TEXT("cannot be used without appropriate licensing."));
return;
}
hr = pGraph->AddFilter(pAComp, L"Audio Encoder");
if(FAILED(hr))
{
AfxMessageBox(TEXT("Could not add selected audio compressor to the graph."));
return;
}
hr = pBuilder->SetOutputFileName(
&MEDIASUBTYPE_Avi, // Specifies AVI for the target file.
L"C:\\Example.avi", // File name.
&pMux, // Receives a pointer to the mux.
NULL); // (Optional) Receives a pointer to the file sink.
IConfigAviMux *pConfigMux = NULL;
hr = pMux->QueryInterface(IID_IConfigAviMux, (void**)&pConfigMux);
if (SUCCEEDED(hr))
{
pConfigMux->SetOutputCompatibilityIndex(TRUE);
pConfigMux->SetMasterStream(1);
pConfigMux->Release();
}
IConfigInterleaving *pInterleave = NULL;
hr = pMux->QueryInterface(IID_IConfigInterleaving, (void**)&pInterleave);
if (SUCCEEDED(hr))
{
pInterleave->put_Mode(INTERLEAVE_CAPTURE);
pInterleave->Release();
}
hr = pBuilder->RenderStream(
&PIN_CATEGORY_CAPTURE, // Pin category.
&MEDIATYPE_Video, // Media type.
pSrc, // Capture filter.
pVComp, // Intermediate filter (Video Encoder).
pMux); // Mux or file sink filter.
hr = pBuilder->RenderStream(
&PIN_CATEGORY_CAPTURE, // Pin category.
&MEDIATYPE_Audio, // Media type.
pAudioSrc, // Capture filter.
pAComp, // Intermediate filter (Audio Encoder).
pMux); // Mux or file sink filter.
pMediaControl->Run();
m_IsRecorded = TRUE;
