DirectShow Utility

DirectShow 工具类，谁用谁知道！

#ifndef DSUtility_H
#define DSUtility_H//#include <DShow.h>
#include <DMODShow.h>
#include <ATLColl.h>//#include "COMUtility.h"//typedef CAtlList<IBaseFilter *> CFilterList;//template <DWORD dwUnique>
class DSUtilityT
{typedef DSUtilityT<dwUnique> This;public:static HRESULT AddFilter(IGraphBuilder *pGraph, REFCLSID clsidDMO, REFCLSID clsidCat, LPCWSTR pwszName,IBaseFilter **ppBaseFilter){if (pGraph == NULL || ppBaseFilter == NULL || pwszName == NULL) {return E_POINTER;}*ppBaseFilter = NULL;HRESULT hr = S_OK;{CComQIPtr<IBaseFilter> pBaseFilter;CComQIPtr<IDMOWrapperFilter> pDMOWrapper;hr = pBaseFilter.CoCreateInstance(CLSID_DMOWrapperFilter);if (FAILED(hr)) {goto Exit;}pDMOWrapper = pBaseFilter;if (pDMOWrapper == NULL) {hr = E_FAIL;goto Exit;}hr = pDMOWrapper->Init(clsidDMO, clsidCat);if (FAILED(hr)) {goto Exit;}if (SUCCEEDED(pGraph->AddFilter(pBaseFilter, pwszName))) {*ppBaseFilter = pBaseFilter.Detach();}}Exit:return hr;}static HRESULT AddFilter(IGraphBuilder *pGraph, REFCLSID clsid, LPCWSTR pwszName, IBaseFilter**ppBaseFilter, LPCWSTR lpszPath){if (pGraph == NULL || ppBaseFilter == NULL || pwszName == NULL || lpszPath == NULL) {return E_POINTER;}*ppBaseFilter = NULL;HRESULT hr = S_OK;{CComPtr<IUnknown> pUnknown;hr = COMUtility::CreateObjectFromPath(clsid, &pUnknown, lpszPath);if (FAILED(hr)) {goto Exit;}CComQIPtr<IBaseFilter> pBaseFilter(pUnknown);if (SUCCEEDED(pGraph->AddFilter(pBaseFilter, pwszName))) {*ppBaseFilter = pBaseFilter.Detach();}}Exit:return hr;}static HRESULT AddFilter(IGraphBuilder *pGraph, REFCLSID clsid, LPCWSTR pwszName, IBaseFilter**ppBaseFilter){if (pGraph == NULL || ppBaseFilter == NULL || pwszName == NULL) {return E_POINTER;}*ppBaseFilter = NULL;CComPtr<IBaseFilter> pBaseFilter;HRESULT hr = pBaseFilter.CoCreateInstance(clsid);if (FAILED(hr)) {return hr;}if (SUCCEEDED(pGraph->AddFilter(pBaseFilter, pwszName))) {*ppBaseFilter = pBaseFilter.Detach();}pBaseFilter.Release();return S_OK;}template <class EnumeratorT>static HRESULT EnumFilter(IGraphBuilder *pGraph, EnumeratorT &enumerator, DWORD dwContext){if (pGraph == NULL) {return E_POINTER;}CComPtr<IEnumFilters> pEnumFilters;if (FAILED(pGraph->EnumFilters(&pEnumFilters))) {return E_FAIL;}CComPtr<IBaseFilter> pBaseFilter;while (pEnumFilters->Next(1, &pBaseFilter, 0) == S_OK) {if (!enumerator(pBaseFilter, dwContext)) {break;}pBaseFilter.Release();}return S_OK;}template <class EnumeratorT>static HRESULT EnumPin(IBaseFilter *pBaseFilter, EnumeratorT &enumerator, DWORD dwContext){if (pBaseFilter == NULL) {return E_POINTER;}CComPtr<IEnumPins> pEnumPins;if (FAILED(pBaseFilter->EnumPins(&pEnumPins))) {return E_FAIL;}CComPtr<IPin> pPin;while (pEnumPins->Next(1, &pPin, 0) == S_OK) {if (!enumerator(pPin, dwContext)) {break;}pPin.Release();}return S_OK;}//struct stGetUnconnectedPin{stGetUnconnectedPin():   pPinDest(NULL),pinDirDest(PINDIR_INPUT){}BOOL operator() (IPin *pPin, DWORD dwContext){PIN_DIRECTION pinDir;if (pPin == NULL || FAILED(pPin->QueryDirection(&pinDir)) || pinDir != pinDirDest) {return TRUE;}CComPtr<IPin> pConnectedTo;if (SUCCEEDED(pPin->ConnectedTo(&pConnectedTo))) {return TRUE;}pPinDest = pPin;pPinDest->AddRef();return FALSE;}PIN_DIRECTION pinDirDest;IPin *pPinDest;};static HRESULT GetUnconnectedPin(IBaseFilter *pFilter, PIN_DIRECTION pinDir, IPin **ppPin){if (pFilter == NULL || ppPin == NULL) {return E_POINTER;}*ppPin = NULL;stGetUnconnectedPin getUnconnectedPin;getUnconnectedPin.pPinDest  = NULL;getUnconnectedPin.pinDirDest= pinDir;HRESULT hr = This::EnumPin(pFilter, getUnconnectedPin, 0);*ppPin = getUnconnectedPin.pPinDest;return hr;}//struct stGetCapturePin{stGetCapturePin():   pPinDest(NULL){}BOOL operator() (IPin *pPin, DWORD dwContext){CComQIPtr<IKsPropertySet> pPropertySet(pPin);if (pPropertySet == NULL) {return TRUE;}GUID guidPropID;DWORD dwReturn = 0;if (FAILED(pPropertySet->Get(AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY, NULL, 0,&guidPropID, sizeof(guidPropID), &dwReturn))) {return TRUE;}if (guidPropID == PIN_CATEGORY_CAPTURE) {pPinDest = pPin;pPinDest->AddRef();return FALSE;}return TRUE;}IPin *pPinDest;};static HRESULT GetCapturePin(IBaseFilter *pFilter, IPin **ppPin){if (pFilter == NULL || ppPin == NULL) {return E_POINTER;}*ppPin = NULL;stGetCapturePin getCapturePin;getCapturePin.pPinDest = NULL;HRESULT hr = This::EnumPin(pFilter, getCapturePin, 0);*ppPin = getCapturePin.pPinDest;return hr;}//struct stGetPinCount{stGetPinCount():   lpInputPinCount(NULL),lpOutputPinCount(NULL){}BOOL operator() (IPin *pPin, DWORD dwContext){PIN_DIRECTION pinDir = PINDIR_INPUT;if (pPin == NULL || FAILED(pPin->QueryDirection(&pinDir))) {return TRUE;}switch (pinDir) {case PINDIR_INPUT:if (lpInputPinCount != NULL) {++(*lpInputPinCount);}break;case PINDIR_OUTPUT:if (lpOutputPinCount != NULL) {++(*lpOutputPinCount);}break;}return FALSE;}LPDWORD lpInputPinCount;LPDWORD lpOutputPinCount;};static HRESULT GetPinCount(IBaseFilter *pFilter, LPDWORD lpInputPinCount, LPDWORD lpOutputPinCount){if (pFilter == NULL || (lpInputPinCount == NULL && lpOutputPinCount == NULL)) {return E_POINTER;}if (lpInputPinCount != NULL) {*lpInputPinCount = 0;}if (lpOutputPinCount != NULL) {*lpOutputPinCount = 0;}stGetPinCount getPinCount;getPinCount.lpInputPinCount = lpInputPinCount;getPinCount.lpOutputPinCount= lpOutputPinCount;return This::EnumPin(pFilter, getPinCount, 0);}//struct stGetPin{stGetPin():   pPinDest(NULL),pinDirDest(PINDIR_INPUT),pszPartialName(NULL){}BOOL operator() (IPin *pPin, DWORD dwContext){PIN_INFO pinInfo = { 0 };if (pPin == NULL || FAILED(pPin->QueryPinInfo(&pinInfo))) {return TRUE;}if (pinInfo.dir == pinDirDest) {//  Ignore the pin nameif (pszPartialName == NULL) {pPinDest = pPin;}else {CHAR szPinName[128] = { 0 };::WideCharToMultiByte(CP_ACP, 0, pinInfo.achName, -1, szPinName,sizeof(szPinName), NULL, NULL);if (::StrStr(szPinName, pszPartialName)) {pPinDest = pPin;}}}pinInfo.pFilter->Release();if (pPinDest != NULL) {pPinDest->AddRef();}return FALSE;}IPin *pPinDest;LPCTSTR pszPartialName;PIN_DIRECTION pinDirDest;};static HRESULT GetPin(IPin **ppPin, IBaseFilter *pFilter, PIN_DIRECTION pinDir, LPCTSTR pszPartialName){if (pFilter == NULL || ppPin == NULL) {return E_POINTER;}stGetPin getPin;getPin.pPinDest     = NULL;getPin.pinDirDest   = pinDir;HRESULT hr = This::EnumPin(pFilter, getPin, 0);*ppPin = getPin.pPinDest;return hr;}//struct stCompletelyConnected{stCompletelyConnected():   bAllConnected(TRUE){}BOOL operator() (IPin *pPin, DWORD dwContext){if (pPin == NULL) {return TRUE;}CComPtr<IPin> pConnectedTo;if (FAILED(pPin->ConnectedTo(&pConnectedTo))) {bAllConnected = FALSE;}return bAllConnected ? TRUE : FALSE;}BOOL bAllConnected;};static HRESULT CompletelyConnected(IBaseFilter *pFilter, LPBOOL lpCompletelyConnected){if (pFilter == NULL || lpCompletelyConnected == NULL) {return E_POINTER;}stCompletelyConnected completelyConnected;HRESULT hr = This::EnumPin(pFilter, completelyConnected, 0);*lpCompletelyConnected = completelyConnected.bAllConnected;return hr;}//static HRESULT ConnectFilters(IGraphBuilder *pGraph, IPin *pPinOutput, IBaseFilter *pFilterInput){if (pGraph == NULL || pPinOutput == NULL || pFilterInput == NULL) {return E_POINTER;}PIN_DIRECTION pinDir;pPinOutput->QueryDirection(&pinDir);if (pinDir != PINDIR_OUTPUT) {return E_INVALIDARG;}CComPtr<IPin> pPinInput;HRESULT hr = GetUnconnectedPin(pFilterInput, PINDIR_INPUT, &pPinInput);if (FAILED(hr)) {return hr;}return pGraph->Connect(pPinOutput, pPinInput);}static HRESULT ConnectFilters(IGraphBuilder *pGraph, IBaseFilter *pFilterOutput, IBaseFilter*pFilterInput){if (pGraph == NULL || pFilterOutput == NULL || pFilterInput == NULL) {return E_POINTER;}CComPtr<IPin> pPinOutput;HRESULT hr = This::GetUnconnectedPin(pFilterOutput, PINDIR_OUTPUT, &pPinOutput);if (FAILED(hr)) {return hr;}return This::ConnectFilters(pGraph, pPinOutput, pFilterInput);}//static HRESULT GetNextFilter(IBaseFilter *pFilter, PIN_DIRECTION pinDirDest, IBaseFilter**ppFilterNext){if (pFilter == NULL || ppFilterNext == NULL) {return E_POINTER;}*ppFilterNext = NULL;CComPtr<IEnumPins> pEnumPins;if (FAILED(pFilter->EnumPins(&pEnumPins))) {return E_FAIL;}CComPtr<IPin> pPin;while (pEnumPins->Next(1, &pPin, 0) == S_OK) {PIN_DIRECTION pinDir;if (FAILED(pPin->QueryDirection(&pinDir))) {break;}if (pinDir == pinDirDest) {CComPtr<IPin> pPinNext;if (SUCCEEDED(pPin->ConnectedTo(&pPinNext))) {PIN_INFO pinInfo;if (FAILED(pPinNext->QueryPinInfo(&pinInfo)) || (pinInfo.pFilter ==NULL)) {return E_UNEXPECTED;}*ppFilterNext = pinInfo.pFilter;return S_OK;}}pPin.Release();}pEnumPins.Release();return E_FAIL;}static VOID AddFilter(CFilterList &filterList, IBaseFilter *pFilter){if (pFilter == NULL) {return;}POSITION posIndex = filterList.GetHeadPosition();while (posIndex != NULL) {CComPtr<IBaseFilter> pFilterNext(filterList.GetNext(posIndex));if (pFilterNext.IsEqualObject(pFilter)) {return;}}pFilter->AddRef();filterList.AddTail(pFilter);}static HRESULT GetPeerFilters(IBaseFilter *pFilterStart, PIN_DIRECTION pinDirDest, CFilterList&FilterList){if (pFilterStart == NULL) {return E_POINTER;}CComPtr<IPin> pPin;CComPtr<IEnumPins> pEnumPins;if (FAILED(pFilterStart->EnumPins(&pEnumPins))) {return E_FAIL;}while (pEnumPins->Next(1, &pPin, 0) == S_OK) {PIN_DIRECTION pinDir;if (FAILED(pPin->QueryDirection(&pinDir))) {pPin.Release();break;}if (pinDir == pinDirDest) {CComPtr<IPin> pPinNext;if (SUCCEEDED(pPin->ConnectedTo(&pPinNext))) {PIN_INFO pinInfo;if (FAILED(pPinNext->QueryPinInfo(&pinInfo)) || (pinInfo.pFilter ==NULL)) {return E_UNEXPECTED;}This::AddFilter(FilterList, pinInfo.pFilter);pinInfo.pFilter->Release();}}pPin.Release();}pEnumPins.Release();return S_OK;}static void NukeDownstream(IGraphBuilder *pGraph, IBaseFilter *pFilter){if (pGraph == NULL || pFilter == NULL) {return;}CComPtr<IEnumPins> pEnumPins;if (FALSE(pFilter->EnumPins(&pEnumPins)) || pEnumPins == NULL) {return;}pEnumPins->Reset();CComPtr<IPin> pPin;ULONG cFetched = 0;while (SUCCEEDED(pEnumPins->Next(1, &pPin, &cFetched))) {if (pPin == NULL && cFetched == 0) {break;}CComPtr<IPin> pConnectedPin;pPin->ConnectedTo(&pConnectedPin);if (pConnectedPin != NULL) {PIN_INFO pinInfo;if (SUCCEEDED(pConnectedPin->QueryPinInfo(&pinInfo))) {if (pinInfo.dir == PINDIR_INPUT) {This::NukeDownstream(pGraph, pinInfo.pFilter);pGraph->Disconnect(pConnectedPin);pGraph->Disconnect(pPin);pGraph->RemoveFilter(pinInfo.pFilter);}pinInfo.pFilter->Release();}pConnectedPin.Release();}pPin.Release();}pEnumPins.Release();}static void NukeUpstream(IGraphBuilder *pGraph, IBaseFilter *pFilter){if (pGraph == NULL || pFilter == NULL) {return;}CComPtr<IEnumPins> pEnumPins;if (FAILED(pFilter->EnumPins(&pEnumPins)) || pEnumPins == NULL) {return;}pEnumPins->Reset();CComPtr<IPin> pPin;ULONG cFetched = 0;while (SUCCEEDED(pEnumPins->Next(1, &pPin, &cFetched))) {if (pPin == NULL || cFetched == 0) {break;}CComPtr<IPin> pConnectedPin;pPin->ConnectedTo(&pConnectedPin);if (pConnectedPin != NULL) {PIN_INFO pinInfo;if (SUCCEEDED(pConnectedPin->QueryPinInfo(&pinInfo))) {if (pinInfo.dir == PINDIR_OUTPUT) {This::NukeUpstream(pGraph, pinInfo.pFilter);pGraph->Disconnect(pConnectedPin);pGraph->Disconnect(pPin);pGraph->RemoveFilter(pinInfo.pFilter);}pinInfo.pFilter->Release();}pConnectedPin.Release();}pPin.Release();}pEnumPins.Release();}//static BOOL IsFilterRegistered(REFCLSID filterId){CComPtr<IBaseFilter> pBaseFilter;return (SUCCEEDED(pBaseFilter.CoCreateInstance(filterId)) && pBaseFilter != NULL);}static BOOL RegisterFilter(LPCSTR pszFilterAx){typedef HRESULT (WINAPI *REGISTER_FUNC)();HMODULE hModule = ::LoadLibraryA(pszFilterAx);if (hModule == NULL) {return FALSE;}REGISTER_FUNC registerFunc = (REGISTER_FUNC) GetProcAddress(hModule, "DllRegisterServer");if (registerFunc != NULL) {registerFunc();}::FreeLibrary(hModule);return (registerFunc != NULL);}static BOOL RegisterFilter(LPCWSTR pszFilterAx){typedef HRESULT (WINAPI *REGISTER_FUNC)();HMODULE hModule = ::LoadLibraryW(pszFilterAx);if (hModule == NULL) {return FALSE;}REGISTER_FUNC registerFunc = (REGISTER_FUNC) GetProcAddress(hModule, "DllRegisterServer");if (registerFunc != NULL) {registerFunc();}::FreeLibrary(hModule);return (registerFunc != NULL);}//static DWORD DecideDeviceType(IBaseFilter *pBaseFilter){if (pBaseFilter == NULL) {return DT_UNKNOWN;}//  Check if DV deviceCComQIPtr<IAMExtTransport> pAMExtTransPost(pBaseFilter);if (pAMExtTransPost != NULL) {return DT_DV;}//  Check if WDM analogCComQIPtr<IAMAnalogVideoDecoder> pDecoder(pBaseFilter);if (pDecoder != NULL) {return DT_ANALOG_WDM;}//  Check if VFW analogCComQIPtr<IAMVfwCaptureDialogs> pVfwDlgs(pBaseFilter);if (pVfwDlgs != NULL) {return DT_ANALOG_VFW;}//  Check if audio capture deviceCComQIPtr<IAMAudioInputMixer> pAudioMixer(pBaseFilter);if (pAudioMixer != NULL) {return DT_ANALOG_AUDIO;}return DT_UNKNOWN;}//  Given the displayname of devices, determine if they are the same onetemplate <typename StringT1, typename StringT2>static BOOL IsSameDevice(StringT1 pszDeviceName1, StringT2 pszDeviceName2){CAtlString deviceName1;CAtlString deviceName2;CAtlString temp1(pszDeviceName1);CAtlString temp2(pszDeviceName2);INT backSlash1 = temp1.Find(TEXT("\\\\"), 0);INT backSlash2 = temp2.Find(TEXT("\\\\"), 0);if (backSlash1 >= 0 && backSlash2 >= 0) {deviceName1 = temp1.Right(temp1.GetLength() - backSlash1);deviceName2 = temp2.Right(temp2.GetLength() - backSlash2);return (deviceName1.CompareNoCase(deviceName2) == 0);}else {return (temp1.CompareNoCase(temp2) == 0);}}template <typename QueryCallbackT>static BOOL QueryDeviceCategory(REFGUID guidCategory, QueryCallbackT queryCallback, DWORD dwContext){CComPtr<ICreateDevEnum> pEnumHardware;if (queryCallback == NULL || FAILED(pEnumHardware.CoCreateInstance(CLSID_SystemDeviceEnum)) ||pEnumHardware == NULL) {return FALSE;}CComPtr<IEnumMoniker> pEnumMoniker;if (FAILED(pEnumHardware->CreateClassEnumerator(guidCategory, &pEnumMoniker, 0)) ||pEnumMoniker == NULL) {return FALSE;}pEnumMoniker->Reset();ULONG lFetched = 0;CComPtr<IMoniker> pMoniker;while (SUCCEEDED(pEnumMoniker->Next(1, &pMoniker, &lFetched)) && (lFetched > 0)) {if (pMoniker == NULL) {continue;}LPOLESTR pwzDisplayName = NULL;CComPtr<IBaseFilter> pBaseFilter;CComPtr<IPropertyBag> pPropertyBag;CComVariant varFriendlyName;HRESULT hr = pMoniker->GetDisplayName(NULL, NULL, &pwzDisplayName);if (FAILED(hr)) {goto Next;}hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (LPVOID *) &pPropertyBag);if (FAILED(hr)) {goto Next;}hr = pPropertyBag->Read(L"FriendlyName", &varFriendlyName, NULL);if (FAILED(hr)) {goto Next;}hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (PVOID *) &pBaseFilter);if (FAILED(hr)) {goto Next;}queryCallback(pwzDisplayName, V_BSTR(&varFriendlyName), pBaseFilter, dwContext);Next:if (pwzDisplayName != NULL) {CoTaskMemFree(pwzDisplayName);}pMoniker.Release();}return TRUE;}template <typename QueryCallbackT>static BOOL QueryVideoCaptureDevices(QueryCallbackT queryCallback, DWORD dwContext) { returnThis::QueryDeviceCategory(CLSID_VideoInputDeviceCategory, queryCallback, dwContext); }template <typename QueryCallbackT>static BOOL QueryAudioCaptureDevices(QueryCallbackT queryCallback, DWORD dwContext) { returnThis::QueryDeviceCategory(CLSID_AudioInputDeviceCategory, queryCallback, dwContext); }template <typename StringT>static IBaseFilter * CreateHardwareFilter(REFGUID guidCategory, StringT lpszFriendlyName){CComPtr<ICreateDevEnum> pEnumHardware;HRESULT hr = pEnumHardware.CoCreateInstance(CLSID_SystemDeviceEnum);if (FAILED(hr) || pEnumHardware == NULL) {return NULL;}CComPtr<IBaseFilter> pHardwareFilter;CComPtr<IEnumMoniker> pEnumMoniker;hr = pEnumHardware->CreateClassEnumerator(guidCategory, &pEnumMoniker, 0);if (pEnumMoniker == NULL) {return NULL;}pEnumMoniker->Reset();ULONG lFetched = 0;CComPtr<IMoniker> pMoniker;while (pHardwareFilter == NULL && SUCCEEDED(pEnumMoniker->Next(1, &pMoniker, &lFetched)) &&lFetched) {if (pMoniker == NULL) {continue;}CComPtr<IPropertyBag> pPropertyBag;CComVariant varName;hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (LPVOID *) &pPropertyBag);if (SUCCEEDED(hr)) {hr = pPropertyBag->Read(L"FriendlyName", &varName, NULL);}if (SUCCEEDED(hr)) {if (CComBSTR(V_BSTR(&varName)) == CComBSTR(lpszFriendlyName)) {pMoniker->BindToObject(0, 0, IID_IBaseFilter, (PVOID *)&pHardwareFilter);}}pMoniker.Release();}return pHardwareFilter.Detach();}template <typename StringT>static IBaseFilter * CreateHardwareFilterEx(REFGUID guidCategory, StringT pszDisplayName, CComVariant&varFriendlyName){CComPtr<ICreateDevEnum> pEnumHardware;if (FAILED(pEnumHardware.CoCreateInstance(CLSID_SystemDeviceEnum)) || pEnumHardware == NULL) {return NULL;}CComPtr<IBaseFilter> pHardwareFilter;CComPtr<IEnumMoniker> pEnumMoniker;HRESULT hr = pEnumHardware->CreateClassEnumerator(guidCategory, &pEnumMoniker, 0);if (pEnumMoniker == NULL) {return NULL;}pEnumMoniker->Reset();ULONG lFetched = 0;CComPtr<IMoniker> pMoniker;while (pHardwareFilter == NULL && SUCCEEDED(pEnumMoniker->Next(1, &pMoniker, &lFetched)) &&(lFetched > 0)) {if (pMoniker == NULL) {continue;}LPOLESTR pwzDisplayName = NULL;hr = pMoniker->GetDisplayName(NULL, NULL, &pwzDisplayName);if (SUCCEEDED(hr)) {if (This::IsSameDevice(pwzDisplayName, pszDisplayName)) {pMoniker->BindToObject(0, 0, IID_IBaseFilter, (LPVOID *)&pHardwareFilter);}CoTaskMemFree(pwzDisplayName);}if (pszFriendlyName != NULL && pHardwareFilter != NULL) {CComPtr<IPropertyBag> pPropertyBag;pszFriendlyName[0] = 0;if (SUCCEEDED(pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (PVOID *)&pPropertyBag))) {pPropertyBag->Read(L"FriendlyName", &varFriendlyName, NULL);}}pMoniker.Release();}return pHardwareFilter.Detach();}//  Create device according to the display nametemplate <typename StringT>static IBaseFilter * CreateDevice(BOOL bVideo, StringT pszDisplayName, CComVariant &varFriendlyName){ return This::CreateHardwareFilterEx(bVideo ? CLSID_VideoInputDeviceCategory :CLSID_AudioInputDeviceCategory, pszDisplayName, varFriendlyName); }template <typename StringT>static IBaseFilter * CreateCompressor(BOOL bVideo, StringT pszName) { returnThis::CreateHardwareFilter(bVideo ? CLSID_VideoCompressorCategory : CLSID_AudioCompressorCategory, pszName); }template <typename StringT>static IBaseFilter * CreateVideoDevice(StringT pszFriendlyName)     { returnThis::CreateHardwareFilter(CLSID_VideoInputDeviceCategory, pszFriendlyName); }template <typename StringT>static IBaseFilter * CreateAudioDevice(StringT pszFriendlyName)     { returnThis::CreateHardwareFilter(CLSID_AudioInputDeviceCategory, pszFriendlyName); }static IBaseFilter * FindFilter(IGraphBuilder *pGraphBuilder, REFCLSID clsID){if (pGraphBuilder == NULL) {return NULL;}CComPtr<IEnumFilters> pEnumFilters;pGraphBuilder->EnumFilters(&pEnumFilters);if (pEnumFilters == NULL) {return NULL;}CLSID clsid;ULONG lFetchCount = 0;CComQIPtr<IPersist> pPersist;CComQIPtr<IBaseFilter> pBaseFilter;CComQIPtr<IBaseFilter> pFoundFilter;while (S_OK == pEnumFilters->Next(1, &pBaseFilter, &lFetchCount) && lFetchCount && !pFoundFilter) {pPersist = pBaseFilter;if (pPersist != NULL) {pPersist->GetClassID(&clsid);if (clsID == clsid) {pFoundFilter = pBaseFilter;}}pPersist.Release();pFoundFilter.Release();}return pFoundFilter.Detach();}static HRESULT ShowFilterPropertyPage(IBaseFilter *pBaseFilter){if (pBaseFilter == NULL) {return E_INVALIDARG;}CComQIPtr<ISpecifyPropertyPages> pSpecify(pBaseFilter);if (pSpecify == NULL) {return E_NOINTERFACE;}CAUUID caGUID = { 0 };pSpecify->GetPages(&caGUID);pSpecify.Release();OleCreatePropertyFrame(::GetActiveWindow(), 0, 0, NULL, 1, (IUnknown **) &pBaseFilter,caGUID.cElems, caGUID.pElems, 0, 0, NULL);CoTaskMemFree(caGUID.pElems);return S_OK;}template <typename QueryCallbackT>static VOID QueryMediaType(IAMStreamConfig *pStreamConfig, QueryCallbackT queryCallback, DWORDdwContext){INT nConfigCount= 0;INT nConfigSize = 0;pStreamConfig->GetNumberOfCapabilities(&nConfigCount, &nConfigSize);LPBYTE lpConfig = new BYTE[nConfigSize];AM_MEDIA_TYPE *pMediaType = NULL;for (INT i=0; i<nConfigCount; ++i) {pStreamConfig->GetStreamCaps(i, &pMediaType, lpConfig);queryCallback(pStreamConfig, i, pMediaType, dwContext);DeleteMediaType(pMediaType);}delete []lpConfig;lpConfig = NULL;}
};//typedef DSUtilityT<0> DSUtility;//#endif

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