请问directshow一条链路怎么添加多个filter（至少三个）？

[yinfuyong]

我自己写了一个Transformer filter,加入链路已经没有问题，

source filter ---> Transformer filter ---> RenderStream已经成功预览

现在想在中间再加一个Filter在中间，怎么做呢？试了几次不行

CComPtr<ICaptureGraphBuilder2>m_pCapture;
CComPtr<IGraphBuilder> m_pGraph;
CComPtr< IBaseFilter > pCap;
。。。。。。。
m_pGraph->AddFilter(pCap,L"pcap");//获取视频输入filter
m_pGraph->AddFilter(pMyfilter,L"grab");//我自己写的Transformer filter
m_pCapture->RenderStream(&PIN_CATEGORY_PREVIEW,&MEDIATYPE_Video,pCap,pMyfilter,NULL);

[jtujtujtu]

可以手动添加、连接
具体的可以参考 帮助或者陆其明的 directshow 书

[yinfuyong]

请大家提示下阿

[yinfuyong]

顶！

[mjh1021]

把pTransform插入到pFilter前面，你把下面的成员变量改成你自己的就好了。
HRESULT CDXGraph::ConnectUpstreamOf(IBaseFilter* pFilter, IBaseFilter* pTransform)
{
IPin* pPinIn = InputPinOf(pFilter);
if (!pPinIn)
{
return E_FAIL;
}

// Get the peer output pin
IPin* pPinOut = NULL;
HRESULT hr = pPinIn->ConnectedTo(&pPinOut);
if (FAILED(hr))
{
pPinIn->Release();
return hr;
}

// Disconnect the current connection
hr = mGraph->Disconnect(pPinOut);
if (SUCCEEDED(hr))
{
hr = mGraph->Disconnect(pPinIn);
}

// Insert pTransform filter by connecting its input pin and output pin
if (SUCCEEDED(hr))
{
IPin* pPinInXfm = InputPinOf(pTransform);
hr = mGraph->Connect(pPinOut, pPinInXfm);
pPinInXfm->Release();
}
if (SUCCEEDED(hr))
{
IPin* pPinOutXfm = OutputPinOf(pTransform);
hr = mGraph->Connect(pPinOutXfm, pPinIn);
pPinOutXfm->Release();
}

pPinIn->Release();
pPinOut->Release();
return hr;
}

[yinfuyong]

谢谢 楼上二位的回复

[koople]

用一个分流filter