未释放筛选器com对象导致崩溃

我正在使用带有vlc的Viveks捕获过滤器(http://tmhare.mvps.org/downloads/vcam.zip)以模拟捕获源。当过滤器打开，我关闭vlc时，我会崩溃。堆栈跟踪指示2个COM对象仍然存在（我猜是过滤器和引脚），应该在CoUninitialize调用之前释放。我的问题是，我不确定在哪里释放filter和pin COM对象，我有一个fitler和pin的析构函数，但当vlc关闭时，它们永远不会被调用。有人遇到了类似的问题（未发布的DirectShow CSource筛选器使程序在进程关闭时崩溃）。

这是dll的重要注册部分。

STDAPI RegisterFilters( BOOL bRegister )
{
    HRESULT hr = NOERROR;
    WCHAR achFileName[MAX_PATH];
    char achTemp[MAX_PATH];
    ASSERT(g_hInst != 0);
    if( 0 == GetModuleFileNameA(g_hInst, achTemp, sizeof(achTemp))) 
        return AmHresultFromWin32(GetLastError());
    MultiByteToWideChar(CP_ACP, 0L, achTemp, lstrlenA(achTemp) + 1, 
                   achFileName, NUMELMS(achFileName));
    hr = CoInitialize(0);
    if(bRegister)
    {
        hr = AMovieSetupRegisterServer(CLSID_VirtualCam, L"Virtual Cam", achFileName, L"Both", L"InprocServer32");
    }
    if( SUCCEEDED(hr) )
    {
        IFilterMapper2 *fm = 0;
        hr = CreateComObject( CLSID_FilterMapper2, IID_IFilterMapper2, fm );
        if( SUCCEEDED(hr) )
        {
            if(bRegister)
            {
                IMoniker *pMoniker = 0;
                REGFILTER2 rf2;
                rf2.dwVersion = 1;
                rf2.dwMerit = MERIT_DO_NOT_USE;
                rf2.cPins = 1;
                rf2.rgPins = &AMSPinVCam;
                hr = fm->RegisterFilter(CLSID_VirtualCam, L"Virtual Cam", &pMoniker, &CLSID_VideoInputDeviceCategory, NULL, &rf2);
            }
            else
            {
                hr = fm->UnregisterFilter(&CLSID_VideoInputDeviceCategory, 0, CLSID_VirtualCam);
            }
        }  
      // release interface
      //
      if(fm)
          fm->Release();
    }
    if( SUCCEEDED(hr) && !bRegister )
         hr = AMovieSetupUnregisterServer( CLSID_VirtualCam );
    CoFreeUnusedLibraries();
    CoUninitialize();
    return hr;
}
STDAPI DllRegisterServer()
{
    return RegisterFilters(TRUE);
}
STDAPI DllUnregisterServer()
{
    return RegisterFilters(FALSE);
}
extern "C" BOOL WINAPI DllEntryPoint(HINSTANCE, ULONG, LPVOID);
BOOL APIENTRY DllMain(HANDLE hModule, DWORD  dwReason, LPVOID lpReserved)
{
    return DllEntryPoint((HINSTANCE)(hModule), dwReason, lpReserved);
}

的重要过滤部分

CVCamStream::CVCamStream(HRESULT *phr, CVCam *pParent, LPCWSTR pPinName) :
CSourceStream(NAME("Virtual Cam"),phr, pParent, pPinName), m_pParent(pParent)
{
    // Set the default media type as 320x240x24@15
    GetMediaType(4, &m_mt);
}
CVCamStream::~CVCamStream()
{
    m_pParent->Release();
}