Array<WebcamInfo> EnumerateWebcams()
{
Array<WebcamInfo> results;
ComPtr<ICreateDevEnum> devEnum;
if (!detail::CreateSystemDeviceEnum(&devEnum))
{
return results;
}
ComPtr<IEnumMoniker> enumMoniker;
if (FAILED(devEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &enumMoniker, 0)))
{
return results;
}
ComPtr<IMoniker> moniker;
for (uint32 index = 0; enumMoniker->Next(1, &moniker, nullptr) == S_OK; ++index)
{
ComPtr<IPropertyBag> propertyBag;
if (FAILED(moniker->BindToStorage(0, 0, IID_IPropertyBag, &propertyBag)))
{
continue;
}
VARIANT var;
var.vt = VT_BSTR;
if (FAILED(propertyBag->Read(L"FriendlyName", &var, 0)))
{
continue;
}
WebcamInfo info;
info.name = Unicode::FromWString(var.bstrVal);
info.index = index;
VariantClear(&var);
var.vt = VT_BSTR;
if (SUCCEEDED(propertyBag->Read(L"DevicePath", &var, 0)))
{
info.uniqueName = Unicode::FromWString(var.bstrVal);
}
results << info;
}
return results;
}
HRESULT FilterEnumerator::TryGetDeviceMoniker(wstring deviceName, IMoniker** moniker) noexcept
{
GUID inputTypes[2];
inputTypes[0] = majorType_;
inputTypes[1] = inputMinorType_;
GUID outputTypes[2];
outputTypes[0] = majorType_;
outputTypes[1] = outputMinorType_;
ComPtr<IEnumMoniker> enumMoniker;
HRESULT hr = filterMapper_->EnumMatchingFilters(
&enumMoniker,
0,
TRUE,
MERIT_DO_NOT_USE,
TRUE,
1,
inputTypes,
nullptr,
nullptr,
FALSE,
TRUE,
1,
outputTypes,
nullptr,
nullptr);
if (FAILED(hr)) throw HResultException(hr);
ComPtr<IMoniker> localMoniker;
while ((hr = enumMoniker->Next(1, &localMoniker, nullptr)) != S_FALSE)
{
ComPtr<IPropertyBag> propertyBag;
hr = localMoniker->BindToStorage(0, 0, IID_IPropertyBag, &propertyBag);
if (FAILED(hr)) continue;
ComSupport::VariantString deviceNameVariant;
hr = propertyBag->Read(constant_friendly_name, deviceNameVariant, 0);
if (FAILED(hr)) continue;
if (deviceNameVariant.GetString() == deviceName)
{
hr = localMoniker.CopyTo(moniker);
return hr;
}
}
return E_FAIL;
}
vector<wstring> FilterEnumerator::GetDeviceNames()
{
GUID inputTypes[2];
inputTypes[0] = majorType_;
inputTypes[1] = inputMinorType_;
GUID outputTypes[2];
outputTypes[0] = majorType_;
outputTypes[1] = outputMinorType_;
ComPtr<IEnumMoniker> enumMoniker;
HRESULT hr = filterMapper_->EnumMatchingFilters(
&enumMoniker,
0,
TRUE,
MERIT_DO_NOT_USE,
TRUE,
1,
inputTypes,
nullptr,
nullptr,
FALSE,
TRUE,
1,
outputTypes,
nullptr,
nullptr);
if (FAILED(hr)) throw HResultException(hr);
vector<wstring> deciceInfo;
ComPtr<IMoniker> moniker;
while ((hr = enumMoniker->Next(1, &moniker, nullptr)) != S_FALSE)
{
ComPtr<IPropertyBag> propertyBag;
hr = moniker->BindToStorage(0, 0, IID_IPropertyBag, &propertyBag);
if (FAILED(hr)) continue;
ComSupport::VariantString deviceNameVariant;
hr = propertyBag->Read(constant_friendly_name, deviceNameVariant, 0);
if (FAILED(hr)) continue;
deciceInfo.emplace_back(deviceNameVariant.GetString());
}
return move(deciceInfo);
}
