HRESULT FindConnectedPin(IBaseFilter *pFilter, PIN_DIRECTION PinDir, IPin **ppPin)
{
*ppPin = nullptr;
HRESULT hr;
ComPtr<IEnumPins> pEnum;
ComPtr<IPin> pPin;
hr = pFilter->EnumPins(&pEnum);
if (FAILED(hr))
{
return hr;
}
BOOL bFound = FALSE;
while (pEnum->Next(1, &pPin, nullptr) == S_OK)
{
BOOL bIsConnected;
hr = IsPinConnected(pPin, &bIsConnected);
if (SUCCEEDED(hr))
{
if (bIsConnected)
{
hr = IsPinDirection(pPin, PinDir, &bFound);
}
}
if (FAILED(hr))
{
break;
}
if (bFound)
{
*ppPin = pPin;
pPin->AddRef();
break;
}
}
if (!bFound)
{
hr = VFW_E_NOT_FOUND;
}
return hr;
}
QString UrlFromFileArgs(IInspectable *args)
{
ComPtr<IFileActivatedEventArgs> fileArgs;
COM_ENSURE(args->QueryInterface(fileArgs.GetAddressOf()), QString());
ComPtr<IVectorView<IStorageItem*>> files;
COM_ENSURE(fileArgs->get_Files(&files), QString());
ComPtr<IStorageItem> item;
COM_ENSURE(files->GetAt(0, &item), QString());
HString path;
COM_ENSURE(item->get_Path(path.GetAddressOf()), QString());
quint32 pathLen;
const wchar_t *pathStr = path.GetRawBuffer(&pathLen);
const QString filePath = QString::fromWCharArray(pathStr, pathLen);
qDebug() << "file path: " << filePath;
item->AddRef(); //ensure we can access it later. TODO: how to release?
return QString::fromLatin1("winrt:@%1:%2").arg((qint64)(qptrdiff)item.Get()).arg(filePath);
}
bool ff::BufferCache::BorrowAndMapBuffer(size_t nBytes, ID3D11Buffer **ppBuffer, void **ppMapped)
{
assertRetVal(ppBuffer, false);
size_t nBuffer = GetBufferIndex(nBytes);
size_t nLargestBuffer = _countof(_buffers) - 1;
// Try to reuse a cached buffer
for (ComPtr<ID3D11Buffer> *pCur = _buffers[nBuffer].GetFirst();
pCur; pCur = _buffers[nBuffer].GetNext(*pCur))
{
size_t nCurSize = GetBufferSize(*pCur);
if (nCurSize >= nBytes)
{
if (ppMapped)
{
// Try to lock the buffer
D3D11_MAPPED_SUBRESOURCE map;
assertRetVal(SUCCEEDED(_device->GetContext()->Map(*pCur, 0, D3D11_MAP_WRITE_DISCARD, 0, &map)), false);
*ppMapped = map.pData;
}
*ppBuffer = pCur->AddRef();
_buffers[nBuffer].Delete(*pCur);
return true;
}
}
// See if one of the large buffers should be thrown away
// (to make room for a larger one)
if (nBuffer == nLargestBuffer &&
_allocated[nLargestBuffer] >= GetMaxBufferCount() &&
_buffers[nLargestBuffer].Size())
{
// Throw away one of the "large" buffers, it isn't large enough
for (ComPtr<ID3D11Buffer> *pCur = _buffers[nLargestBuffer].GetFirst();
pCur; pCur = _buffers[nLargestBuffer].GetNext(*pCur))
{
size_t nCurSize = GetBufferSize(*pCur);
if (nCurSize < nBytes)
{
_buffers[nLargestBuffer].Delete(*pCur);
_allocated[nLargestBuffer]--;
break;
}
}
}
// Add a few empty buffers for later
if (nBuffer != nLargestBuffer && !_allocated[nBuffer])
{
for (size_t i = 0; i < GetMaxBufferCount() - 1; i++)
{
ComPtr<ID3D11Buffer> pBuffer;
assertRetVal(CreateBuffer(GetAllocationSize(nBytes), &pBuffer), false);
_buffers[nBuffer].Insert(pBuffer);
_allocated[nBuffer]++;
}
}
// Can't reuse an existing buffer, so create a new one
{
ComPtr<ID3D11Buffer> pBuffer;
assertRetVal(CreateBuffer(GetAllocationSize(nBytes), &pBuffer), false);
if (ppMapped)
{
D3D11_MAPPED_SUBRESOURCE map;
assertRetVal(SUCCEEDED(_device->GetContext()->Map(pBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &map)), false);
*ppMapped = map.pData;
}
*ppBuffer = pBuffer.Detach();
_allocated[nBuffer]++;
return true;
}
}
