static IMFMetadata GetMetadata(IMFMediaSource mediaSource)
{
HResult hr;
// Get IMFPresentationDescriptor.
IMFPresentationDescriptor presentationDescriptor;
hr = mediaSource.CreatePresentationDescriptor(out presentationDescriptor);
MFError.ThrowExceptionForHR(hr);
// Get IMFMetadataProvider.
object provider;
hr = MFExtern.MFGetService(mediaSource, MFServices.MF_METADATA_PROVIDER_SERVICE, typeof(IMFMetadataProvider).GUID, out provider);
MFError.ThrowExceptionForHR(hr);
IMFMetadataProvider metadataProvider = (IMFMetadataProvider)provider;
// Get IMFMetadata.
IMFMetadata metadata;
hr = metadataProvider.GetMFMetadata(presentationDescriptor, 0, 0, out metadata);
MFError.ThrowExceptionForHR(hr);
COMBase.SafeRelease(presentationDescriptor);
presentationDescriptor = null;
COMBase.SafeRelease(metadataProvider);
metadataProvider = null;
return(metadata);
}
protected void CreateTopologyFromSource(out IMFTopology ppTopology)
{
TRACE("CPlayer::CreateTopologyFromSource");
Debug.Assert(m_pSession != null);
Debug.Assert(m_pSource != null);
IMFTopology pTopology = null;
IMFPresentationDescriptor pSourcePD = null;
int cSourceStreams = 0;
HResult hr;
try
{
// Create a new topology.
hr = MFExtern.MFCreateTopology(out pTopology);
MFError.ThrowExceptionForHR(hr);
// Create the presentation descriptor for the media source.
hr = m_pSource.CreatePresentationDescriptor(out pSourcePD);
MFError.ThrowExceptionForHR(hr);
{
// See if there is metadata. If anything fails,
// just leave m_pMetadata as null.
object o;
hr = MFExtern.MFGetService(
m_pSource,
MFServices.MF_METADATA_PROVIDER_SERVICE,
typeof(IMFMetadataProvider).GUID,
out o
);
if (Succeeded(hr))
{
IMFMetadataProvider pMetaProvider = o as IMFMetadataProvider;
hr = pMetaProvider.GetMFMetadata(
pSourcePD,
0, // Stream id 0 == presentation-level metadata.
0, // Reserved
out m_pMetadata);
}
}
// Get the number of streams in the media source.
hr = pSourcePD.GetStreamDescriptorCount(out cSourceStreams);
MFError.ThrowExceptionForHR(hr);
TRACE(string.Format("Stream count: {0}", cSourceStreams));
// For each stream, create the topology nodes and add them to the topology.
for (int i = 0; i < cSourceStreams; i++)
{
AddBranchToPartialTopology(pTopology, m_hwndVideo, m_pSource, pSourcePD, i);
}
// Return the IMFTopology pointer to the caller.
ppTopology = pTopology;
}
catch
{
// If we failed, release the topology
SafeRelease(pTopology);
throw;
}
finally
{
SafeRelease(pSourcePD);
}
}
