Filtergraph生成空文件

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我想模拟一个使用C++在graphedt中创建的工作过滤器图。Filtergraph生成空文件

这是过滤器图表： enter image description here

这是我的代码产生一个空的输出文件。

#include <dshow.h> 
#include "MyFilter.h" 

IPin *GetPin(IBaseFilter *pFilter, PIN_DIRECTION PinDir) 
{ 
    BOOL  bFound = FALSE; 
    IEnumPins *pEnum; 
    IPin  *pPin; 

    pFilter->EnumPins(&pEnum); 
    while (pEnum->Next(1, &pPin, 0) == S_OK) 
    { 
     PIN_DIRECTION PinDirThis; 
     pPin->QueryDirection(&PinDirThis); 
     if (bFound = (PinDir == PinDirThis)) 
      break; 
     pPin->Release(); 
    } 
    pEnum->Release(); 
    return (bFound ? pPin : 0); 
} 
int CALLBACK WinMain(
    _In_ HINSTANCE hInstance, 
    _In_ HINSTANCE hPrevInstance, 
    _In_ LPSTR lpCmdLine, 
    _In_ int nCmdShow 
    ) 
{ 
    //INIT GRAPH 
    CoInitialize(NULL); 

    IGraphBuilder* graphBuilder = NULL; 
    IMediaControl* mediaControl = NULL; 
    IMediaEvent* mediaEvent = NULL; 

    HRESULT hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IFilterGraph, (void **)&graphBuilder); 

    graphBuilder->QueryInterface(IID_IMediaControl, (void **)&mediaControl); 
    graphBuilder->QueryInterface(IID_IMediaEvent, (void **)&mediaEvent); 


    //SOURCE FILTER 
    IBaseFilter* pSource; 

    graphBuilder->AddSourceFilter(L"C:\\TEMP\\Zim.avi", NULL, &pSource); 


    IPin* sourceOUT = GetPin(pSource, PINDIR_OUTPUT); 

    //AVI SPLITTER 

    IBaseFilter* aviSplitter = NULL; 

    hr = CoCreateInstance(CLSID_AviSplitter, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&aviSplitter); 

    IPin* aviSplitIN = GetPin(aviSplitter, PINDIR_INPUT); 
    IPin* aviSplitOUT = GetPin(aviSplitter, PINDIR_OUTPUT); 

    graphBuilder->AddFilter(aviSplitter, L"AVI_SPLITTER"); 

    graphBuilder->Connect(sourceOUT, aviSplitIN); 

    //AVI MUX 

    IBaseFilter* decompressor = NULL; 
    hr = CoCreateInstance(CLSID_AviDest, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&decompressor); 
    graphBuilder->AddFilter(decompressor, L"Decoder"); 

    IPin* decoderIN = GetPin(decompressor, PINDIR_INPUT); 
    IPin* DecoderOUT = GetPin(decompressor, PINDIR_OUTPUT); 

    graphBuilder->Connect(aviSplitOUT, decoderIN); 

    //File Writer 
    IBaseFilter *filewriter = NULL; 
    IFileSinkFilter* filesink = NULL; 

    hr = CoCreateInstance(CLSID_FileWriter, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&filewriter); 

    filewriter->QueryInterface(IID_IFileSinkFilter, (void **)&filesink); 
    graphBuilder->AddFilter(filewriter, L"Filewriter"); 
    IPin* filewriterIN = GetPin(filewriter, PINDIR_INPUT); 
    graphBuilder->Connect(DecoderOUT, filewriterIN); 

    filesink->SetFileName(L"C:\\TEMP\\myfilteroutput123.avi", NULL); 

    hr = mediaControl->Run(); 
    if (SUCCEEDED(hr)) 
    { 
     long evCode; 
     mediaEvent->WaitForCompletion(INFINITE, &evCode); 
    } 

    CoUninitialize(); 

}

编辑：这些问题似乎是，avisplitter只返回一个引脚（输入引脚）。但我不知道为什么或如何添加输出引脚。

来源

2014-03-02 Luke

您的代码不会添加AVI多路复用器，也不会生成您想要的图形。你也应该检查返回的值，因为大概最后一个'Connect'会让你失败。 –

自从我做了DirectShow以来，它已经有一段时间了，但是我似乎记得，在连接至少一个输入引脚之前，AVI分配器没有输出引脚。

这样的尝试执行以下操作：

IPin* aviSplitIN = GetPin(aviSplitter, PINDIR_INPUT); 

graphBuilder->AddFilter(aviSplitter, L"AVI_SPLITTER"); 
graphBuilder->Connect(sourceOUT, aviSplitIN); 

IPin* aviSplitOUT = GetPin(aviSplitter, PINDIR_OUTPUT);

我敢肯定预期，将工作。

作为进一步的观点，总是得到并检查HRESULT s。 HRESULT从Connect返回将告诉你很多关于你正在遭受的错误。在通过NULL引脚的情况下，您将得到一个E_POINTER错误，这可以帮助您更快地将其关联起来！

来源

2014-03-03 12:43:42 Goz

Filtergraph生成空文件

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