HRESULT CMFCamCapture::init()
{
IMFMediaType *pType = NULL;
HRESULT hr;
CHECK_HR(hr = CoInitializeEx(NULL, COINIT_MULTITHREADED));
CHECK_HR(hr = MFStartup(MF_VERSION));
// Configure the media type that the Sample Grabber will receive.
// Setting the major and subtype is usually enough for the topology loader
// to resolve the topology.
CHECK_HR(hr = MFCreateMediaType(&pType));
CHECK_HR(hr = pType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video));
CHECK_HR(hr = pType->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_RGB24));
// Create the sample grabber sink.
CHECK_HR(hr = SampleGrabberCB::CreateInstance(&m_spSampleGrabber));
CHECK_HR(hr = MFCreateSampleGrabberSinkActivate(pType, m_spSampleGrabber, &m_spSinkActivate));
// To run as fast as possible, set this attribute (requires Windows 7):
CHECK_HR(hr = m_spSinkActivate->SetUINT32(MF_SAMPLEGRABBERSINK_IGNORE_CLOCK, TRUE));
// Create the Media Session.
CHECK_HR(hr = MFCreateMediaSession(NULL, &m_spSession));
CHECK_HR(hr = enumVideoDevices());
CHECK_HR(hr = setupVideoDevice());
CHECK_HR(hr = setupMfSession());
done:
SafeRelease(&pType);
return hr;
}
/** Add stream to topology */
FIntPoint FImfVideoPlayer::AddStreamToTopology( IMFTopology* Topology, IMFPresentationDescriptor* PresentationDesc, IMFStreamDescriptor* StreamDesc, FImfSampleGrabberCallback* SampleGrabberCallback )
{
FIntPoint OutDimensions = FIntPoint( ForceInit );
HRESULT HResult = S_OK;
IMFActivate* SinkActivate = NULL;
{
IMFMediaTypeHandler* Handler = NULL;
HResult = StreamDesc->GetMediaTypeHandler( &Handler );
check( SUCCEEDED( HResult ) );
GUID MajorType;
HResult = Handler->GetMajorType( &MajorType );
check( SUCCEEDED( HResult ) );
/* Audio stream */
if( MajorType == MFMediaType_Audio )
{
/* No audio required */
Handler->Release( );
return FIntPoint( ForceInit );
}
/* Video stream */
else if( MajorType == MFMediaType_Video )
{
IMFMediaType* OutputType = NULL;
HResult = Handler->GetCurrentMediaType( &OutputType );
check( SUCCEEDED( HResult ) );
IMFMediaType* InputType = NULL;
HResult = MFCreateMediaType( &InputType );
UINT32 Width = 0, Height = 0;
HResult = MFGetAttributeSize( OutputType, MF_MT_FRAME_SIZE, &Width, &Height );
check( SUCCEEDED( HResult ) );
HResult = InputType->SetGUID( MF_MT_MAJOR_TYPE, MFMediaType_Video );
check( SUCCEEDED( HResult ) );
HResult = InputType->SetGUID( MF_MT_SUBTYPE, MFVideoFormat_RGB32 );
check( SUCCEEDED( HResult ) );
HResult = InputType->SetUINT32( MF_MT_ALL_SAMPLES_INDEPENDENT, TRUE );
check( SUCCEEDED( HResult ) );
HResult = MFCreateSampleGrabberSinkActivate( InputType, SampleGrabberCallback, &SinkActivate );
check( SUCCEEDED( HResult ) );
InputType->Release( );
OutputType->Release( );
OutDimensions = FIntPoint( Width, Height );
}
Handler->Release( );
}
IMFTopologyNode* SourceNode = NULL;
{
HResult = MFCreateTopologyNode( MF_TOPOLOGY_SOURCESTREAM_NODE, &SourceNode );
check( SUCCEEDED( HResult ) );
HResult = SourceNode->SetUnknown( MF_TOPONODE_SOURCE, MediaSource );
check( SUCCEEDED( HResult ) );
HResult = SourceNode->SetUnknown( MF_TOPONODE_PRESENTATION_DESCRIPTOR, PresentationDesc );
check( SUCCEEDED( HResult ) );
HResult = SourceNode->SetUnknown( MF_TOPONODE_STREAM_DESCRIPTOR, StreamDesc );
check( SUCCEEDED( HResult ) );
HResult = Topology->AddNode( SourceNode );
check( SUCCEEDED( HResult ) );
}
IMFTopologyNode* OutputNode = NULL;
{
HResult = MFCreateTopologyNode( MF_TOPOLOGY_OUTPUT_NODE, &OutputNode );
check( SUCCEEDED( HResult ) );
HResult = OutputNode->SetObject( SinkActivate );
check( SUCCEEDED( HResult ) );
HResult = OutputNode->SetUINT32( MF_TOPONODE_STREAMID, 0 );
check( SUCCEEDED( HResult ) );
HResult = OutputNode->SetUINT32( MF_TOPONODE_NOSHUTDOWN_ON_REMOVE, 0 );
check( SUCCEEDED( HResult ) );
HResult = Topology->AddNode( OutputNode );
check( SUCCEEDED( HResult ) );
}
HResult = SourceNode->ConnectOutput( 0, OutputNode, 0 );
check( SUCCEEDED( HResult ) );
SourceNode->Release( );
OutputNode->Release( );
SinkActivate->Release( );
return OutDimensions;
}
