//Возвращает информацию о фильтре DirectShow
//Перед вызовом этой функции необходимо вызвать UpdateDSFiltersArray(...) (если она не вызывалась)
//В случае ошибки функция вернет значение меньше нуля
int CDirectShow::GetDSFilterInfo(LPCWSTR lpwDSFilName, DSFILTERINFO *pDSFI)
{
if (!m_pGraphBuilder) return -1;
if (!m_lDSFilCount) return -1;
IPropertyBag *pPropBag = NULL;
VARIANT varDSFName = { 0 }, varDSFCLSID = { 0 }, varDSFData = { 0 };
varDSFName.vt = VT_BSTR;
varDSFCLSID.vt = VT_BSTR;
varDSFData.vt = (VT_UI1 | VT_ARRAY);
for (m_lCounter = 0; m_lCounter < m_lDSFilCount; m_lCounter++)
{
m_pDSFMoniker[m_lCounter]->BindToStorage(NULL, NULL, IID_IPropertyBag, (LPVOID *)&pPropBag);
if (FAILED(pPropBag->Read(L"FriendlyName", &varDSFName, NULL)))
{
if (m_lCounter >= (m_lDSFilCount - 1))
{
pPropBag->Release();
return -1;
} else continue;
}
if (_wcsicmp(lpwDSFilName, varDSFName.bstrVal) == 0)
{
if(SUCCEEDED(pPropBag->Read(L"CLSID", &varDSFCLSID, NULL)))
{
CLSIDFromString(varDSFCLSID.bstrVal, &pDSFI->cCLSID);
SysFreeString(varDSFCLSID.bstrVal);
}
else
{
ZeroMemory(&pDSFI->cCLSID, sizeof(pDSFI->cCLSID));
}
if(SUCCEEDED(pPropBag->Read(L"FilterData", &varDSFData, NULL)))
{
BSTR *bstrData = NULL;
LPBYTE pData = NULL;
IAMFilterData *pFilterData = NULL;
SafeArrayAccessData(varDSFData.parray, (LPVOID *)&bstrData);
CoCreateInstance(CLSID_FilterMapper2, NULL, CLSCTX_INPROC, __uuidof(IAMFilterData),
(LPVOID *)&pFilterData);
if (SUCCEEDED(pFilterData->ParseFilterData((LPBYTE)bstrData,
varDSFData.parray->cbElements * varDSFData.parray->rgsabound[0].cElements, &pData)))
{
REGFILTER2 *pRF2 = (REGFILTER2 *)*((DWORD *)pData);
pDSFI->dwMerit = pRF2->dwMerit;
CoTaskMemFree(pRF2);
}
SR(pFilterData);
}
else
{
pDSFI->dwMerit = 0;
//Обнуление остальных членов структуры
}
SysFreeString(varDSFName.bstrVal);
pPropBag->Release();
break;
}
else
{
if (m_lCounter >= (m_lDSFilCount - 1))
{
SysFreeString(varDSFName.bstrVal);
pPropBag->Release();
return -1;
}
}
SysFreeString(varDSFName.bstrVal);
pPropBag->Release();
}
return 0;
}
// Read merit and version information
HRESULT MainDialog::GetMerit(IPropertyBag *pPropBag, DWORD *pdwMerit)
{
HRESULT hr;
IAMFilterData *pData = NULL;
VARIANT varFilData={0};
varFilData.vt = VT_UI1 | VT_ARRAY;
varFilData.parray = 0; // docs say to zero this
BYTE *pbFilterData = 0; // 0 if not read
DWORD dwcbFilterDAta = 0; // 0 if not read
// Read compressed filter data from the property bag with a variant
hr = pPropBag->Read(L"FilterData", &varFilData, 0);
if (SUCCEEDED(hr))
{
assert(varFilData.vt == (VT_UI1 | VT_ARRAY));
dwcbFilterDAta = varFilData.parray->rgsabound[0].cElements;
// Access the filter data
hr = SafeArrayAccessData(varFilData.parray, (void **)&pbFilterData);
}
// Get the IAMFilterData interface for parsing the filter data
if (SUCCEEDED(hr))
{
hr = m_pMapper->QueryInterface(__uuidof(IAMFilterData), (void **)&pData);
}
if (SUCCEEDED(hr))
{
BYTE *pb=0;
// Use a helper method to parse the binary filter data. Pass in
// the pointer to the filter data, its size, and a buffer to fill with
// the resulting data. The "pb" buffer is allocated with CoTaskMemAlloc,
// so it must be correspondingly freed by the caller.
hr = pData->ParseFilterData(pbFilterData, dwcbFilterDAta, &pb);
if(SUCCEEDED(hr))
{
REGFILTER2 *pFil = ((REGFILTER2 **)pb)[0];
// Assign the merit value from the REGFILTER2 structure
if (pFil)
{
*pdwMerit = pFil->dwMerit;
// Free the memory allocated by ParseFilterData
CoTaskMemFree(pFil);
}
}
}
if (pbFilterData)
{
SafeArrayUnaccessData(varFilData.parray);
VariantClear(&varFilData);
}
// Release the IAMFilterData interface
SAFE_RELEASE(pData);
return hr;
}
