HRESULT CPlayer::AddBranchToPartialTopology(IMFTopology *pTopology, IMFPresentationDescriptor *pSourcePD, DWORD iStream)
{
TRACE((L"CPlayer::AddBranchToPartialTopology\n"));
assert(pTopology != NULL);
IMFStreamDescriptor* pSourceSD = NULL;
IMFTopologyNode* pSourceNode = NULL;
IMFTopologyNode* pOutputNode = NULL;
BOOL fSelected = FALSE;
HRESULT hr = S_OK;
// Get the stream descriptor for this stream.
CHECK_HR(hr = pSourcePD->GetStreamDescriptorByIndex(iStream, &fSelected, &pSourceSD));
// Create the topology branch only if the stream is selected.
// Otherwise, do nothing.
if (fSelected)
{
// Create a source node for this stream.
CHECK_HR(hr = CreateSourceStreamNode(m_pSource, pSourcePD, pSourceSD, &pSourceNode));
// Create the output node for the renderer.
CHECK_HR(hr = CreateOutputNode(pSourceSD, m_hwndVideo, &pOutputNode));
// Add both nodes to the topology.
CHECK_HR(hr = pTopology->AddNode(pSourceNode));
CHECK_HR(hr = pTopology->AddNode(pOutputNode));
// Connect the source node to the output node.
CHECK_HR(hr = pSourceNode->ConnectOutput(0, pOutputNode, 0));
}
done:
// Clean up.
SAFE_RELEASE(pSourceSD);
SAFE_RELEASE(pSourceNode);
SAFE_RELEASE(pOutputNode);
return hr;
}
HRESULT CreateTopologyBranch(
IMFTopology *pTopology,
IMFMediaSource *pSource, // Media source.
IMFPresentationDescriptor *pPD, // Presentation descriptor.
IMFStreamDescriptor *pSD, // Stream descriptor.
IMFMediaSink *pSink
)
{
CComPtr<IMFTopologyNode> pSourceNode;
CComPtr<IMFTopologyNode> pOutputNode;
HRESULT hr = S_OK;
hr = CreateSourceNode(pSource, pPD, pSD, &pSourceNode);
if (SUCCEEDED(hr))
{
hr = CreateOutputNode(pSink, 0, &pOutputNode);
}
if (SUCCEEDED(hr))
{
hr = pTopology->AddNode(pSourceNode);
}
if (SUCCEEDED(hr))
{
hr = pTopology->AddNode(pOutputNode);
}
if (SUCCEEDED(hr))
{
hr = pSourceNode->ConnectOutput(0, pOutputNode, 0);
}
return hr;
}
