Question

I’m trying to retrieve the IAMStreamConfig interface from the output pin on my Integrated Camera, but am failing to E_NOINTERFACE.

I’m using the IntCam as a testing device, in reality I will have a source filter with two output pins that each support different configurations.

This is why I’m not sure using ICaptureGraphBuilder2::FindInterface is an option, because I still haven’t figured out how I will be able to get the interface from a specific output pin.

CComPtr<IEnumPins> pEnum = NULL;
IPin* pPin = NULL;

HRESULT hr = pFilter->EnumPins(&pEnum);
if (FAILED(hr))
    return hr;

while (S_OK == pEnum->Next(1, &pPin, NULL))
{
   IAMStreamConfig* pAMStreamConfig;
   hr = pPin->QueryInterface(IID_PPV_ARGS(&pAMStreamConfig));
   if (FAILED(hr))
      return hr;
   // ...
}

Answer 1

IAMStreamConfig is not a mandatory interface, it might me missing, though on camera filters it is almost always available (many application would refuse working with a device without this interface otherwise). That is, you should double check that you are querying correct filter and pin, the code snippet looks good.

A real camera is most often implemented via WDM Video Capture Filter which has IAMStreamConfig but since you are using a virtual device, it might be different.