DirectShow

[Ein ehemaliger Benutzer]

Hallo miteinand,

GetCurrentImage

liefert eine Bitmap, das funktiniert auf einem alten Laptop mit 25Hz.

Ein anderes neues System erreicht nur 3Hz .

Wo ist das Problem ?

Pseudocode:

HRESULT CVidDS::Initialize(HWND hWnd)
{
	IBaseFilter* pVmr = NULL;

	// Create the VMR and add it to the filter graph.
	HRESULT hr = CoCreateInstance(CLSID_VideoMixingRenderer, NULL,CLSCTX_INPROC, IID_IBaseFilter, (void**)&pVmr);

	if (SUCCEEDED(hr))
	{
		hr = m_pGB->AddFilter(pVmr, L"Video Mixing Renderer");
		if (SUCCEEDED(hr))
		{
			// Set the rendering mode and number of streams.  
			IVMRFilterConfig* pConfig;

			hr = pVmr->QueryInterface(IID_IVMRFilterConfig, (void**)&pConfig);
			if (SUCCEEDED(hr))
			{
				pConfig->SetRenderingMode(VMRMode_Windowless);
				pConfig->Release();
			}

			hr = pVmr->QueryInterface(IID_IVMRWindowlessControl, (void**)&m_pWC);
			if (SUCCEEDED(hr))
			{
				m_pWC->SetVideoClippingWindow(hWnd);

			}
		}
		pVmr->Release();
	}

	return hr;
}

bool  CVidDS::BindFilter(int deviceId, IBaseFilter **pFilter)
{
	if(deviceId < 0)
	 return false;

	CComPtr<ICreateDevEnum> pCreateDevEnum;
    HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,IID_ICreateDevEnum, (void**)&pCreateDevEnum);
    if (hr != NOERROR)
	 return false;

    CComPtr<IEnumMoniker> pEm;
    hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pEm, 0);
    if(hr != NOERROR)
	 return false;

    pEm->Reset();
    ULONG cFetched;
    IMoniker *pM;
	int index = 0;
    while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK, index <= deviceId)
    {
		IPropertyBag *pBag;
		hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);
		if(SUCCEEDED(hr)) 
		{
			VARIANT var;
			var.vt = VT_BSTR;
			hr = pBag->Read(L"FriendlyName", &var, NULL);
			if (hr == NOERROR) 
			{
				if(index == deviceId)
				 pM->BindToObject(0, 0, IID_IBaseFilter, (void**)pFilter);

				SysFreeString(var.bstrVal);
			}
			pBag->Release();
		}
		pM->Release();
		index++;
    }
	return true;
}

void  CVidDS::Start(void)
{	
    if(!m_pMC) return;

    if(m_psCurrent == Stopped)
    {
		m_pGB->Render(m_pCamOutPin);

        if(SUCCEEDED(m_pMC->Run()))
          m_psCurrent = Running;	
    }
}

void CVidDS::Stop(void)
{
    if(!m_pMC) return;

	if(m_psCurrent == Running)
    {
		m_pGB->Abort();

        if(SUCCEEDED(m_pMC->Stop()))//m_pMC->Pause();
         m_psCurrent = Stopped;		
    }
}

void Poll(void)
{
BYTE* lpCurrImage = NULL;

	HRESULT hr(m_pWC->GetCurrentImage(&lpCurrImage));

	if (SUCCEEDED(hr))
    {	
		LPBITMAPINFOHEADER  pdib = (LPBITMAPINFOHEADER) lpCurrImage;

		BYTE *pTemp32 = lpCurrImage + sizeof(BITMAPINFOHEADER);

		CDib::Draw((BYTE *)pTemp32, pdib);

		CoTaskMemFree(lpCurrImage);

		m_picnr++;
	}
}

AnruferFolge:

HRESULT hr=CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,IID_IGraphBuilder, (void **)&m_pGB);
	if (FAILED(hr))
	 return CVersions::DbgMsg(false, "CVidDS::Create failed IID_IGraphBuilder\r\n");

	Initialize(0);

	if (!BindFilter(m_iDeviceID, &m_pDF))
	 return CVersions::DbgMsg(false, "CVidDS::Create failed BindFilter\r\n");

	hr=m_pGB->AddFilter(m_pDF, L"Video Capture");
	if (FAILED(hr))
	 return CVersions::DbgMsg(false, "CVidDS::Create failed AddFilter\r\n");

CComPtr<IEnumPins> pEnum;
	m_pDF->EnumPins(&pEnum);

	hr = pEnum->Reset();
	hr = pEnum->Next(1, &m_pCamOutPin, NULL);
	hr = m_pGB->QueryInterface(IID_IMediaControl, (void **)&m_pMC);

if (FAILED(hr))
	 return CVersions::DbgMsg(false, "CVidDS::Create failed MediaControl\r\n");

    Start();
    Poll();
    Stop();

Frage:
Was läuft da falsch , in einem MS Forum hat man geschrieben man müsse
einen "eigenen" Filter herstellen ?

Danke für Hinweise
Karsten