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graph.cpp：源码内容
							//------------------------------------------------------------------------------
// File: Graph.cpp
//
// Desc: Sample code for BDA graph building.
//
// Copyright (c) 2000-2002, Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
#include "graph.h"
// 
// NOTE: In this sample, text strings are hard-coded for 
// simplicity and for readability.  For product code, you should
// use string tables and LoadString().
//
//
// An application can advertise the existence of its filter graph
// by registering the graph with a global Running Object Table (ROT).
// The GraphEdit application can detect and remotely view the running
// filter graph, allowing you to 'spy' on the graph with GraphEdit.
//
// To enable registration in this sample, define REGISTER_FILTERGRAPH.
//
#define REGISTER_FILTERGRAPH
// We use channel 46 internally for testing.  Change this constant to any value.
#define DEFAULT_PHYSICAL_CHANNEL    46L
// Constructor, initializes member variables
// and calls InitializeGraphBuilder
CBDAFilterGraph::CBDAFilterGraph() :
    m_fGraphBuilt(FALSE),
    m_fGraphRunning(FALSE),
    m_NetworkType(ATSC),
    m_lMajorChannel(-1), 
    m_lMinorChannel(-1),
    m_lPhysicalChannel(DEFAULT_PHYSICAL_CHANNEL),
    m_dwGraphRegister (0)
{
    if(FAILED(InitializeGraphBuilder()))
        m_fGraphFailure = TRUE;
    else
        m_fGraphFailure = FALSE;
}
// Destructor
CBDAFilterGraph::~CBDAFilterGraph()
{
    if(m_fGraphRunning)
    {
        StopGraph();
    }
    if(m_fGraphBuilt || m_fGraphFailure)
    {
        TearDownGraph();
    }
}
// Instantiate graph object for filter graph building
HRESULT
CBDAFilterGraph::InitializeGraphBuilder()
{
    HRESULT hr = S_OK;
    
    // we have a graph already
    if (m_pFilterGraph)
        return S_OK;
    // create the filter graph
    if (FAILED (hr = m_pFilterGraph.CoCreateInstance (CLSID_FilterGraph)))
    {
        ErrorMessageBox(TEXT("Couldn't CoCreate IGraphBuildern"));
        m_fGraphFailure = true;
        return hr;
    }
    
    return hr;
}
// BuildGraph sets up devices, adds and connects filters
HRESULT
CBDAFilterGraph::BuildGraph(NETWORK_TYPE NetType)
{
    HRESULT hr = S_OK;
    m_NetworkType = NetType;
    // if we have already have a filter graph, tear it down
    if(m_fGraphBuilt)
    {
        if(m_fGraphRunning)
        {
            hr = StopGraph ();
        }
        hr = TearDownGraph ();
    }
    // STEP 1: load network provider first so that it can configure other
    // filters, such as configuring the demux to sprout output pins.
    // We also need to submit a tune request to the Network Provider so it will
    // tune to a channel
    if(FAILED (hr = LoadNetworkProvider()))
    {
        ErrorMessageBox(TEXT("Cannot load network providern"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    hr = m_pNetworkProvider->QueryInterface(__uuidof (ITuner), reinterpret_cast <void**> (&m_pITuner));
    if(FAILED (hr))
    {
        ErrorMessageBox(TEXT("pNetworkProvider->QI: Can't QI for ITuner.n"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    // create a tune request to initialize the network provider
    // before connecting other filters
    CComPtr <IATSCChannelTuneRequest>  pATSCTuneRequest;
    if(FAILED (hr = CreateATSCTuneRequest(
                                        m_lPhysicalChannel,
                                        m_lMajorChannel, 
                                        m_lMinorChannel,
                                        &pATSCTuneRequest
                                        )))
    {
        ErrorMessageBox(TEXT("Cannot create tune requestn"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    //submit the tune request to the network provider
    hr = m_pITuner->put_TuneRequest(pATSCTuneRequest);
    if(FAILED(hr))
    {
        ErrorMessageBox(TEXT("Cannot submit the tune requestn"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    // STEP2: Load tuner device and connect to network provider
    if(FAILED (hr = LoadFilter (
                                KSCATEGORY_BDA_NETWORK_TUNER, 
                                &m_pTunerDevice,
                                m_pNetworkProvider, 
                                TRUE
                                )))
    {
        ErrorMessageBox(TEXT("Cannot load tuner device and connect network providern"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    // STEP3: Load tuner device and connect to demodulator device
    if(FAILED (hr = LoadFilter (
                                KSCATEGORY_BDA_RECEIVER_COMPONENT, 
                                &m_pDemodulatorDevice,
                                m_pTunerDevice, 
                                TRUE
                                )))
    {
        ErrorMessageBox(TEXT("Cannot load capture device and connect tunern"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    // Step4: Load capture device and connect to tuner device
    if(FAILED (hr = LoadFilter (
                                KSCATEGORY_BDA_RECEIVER_COMPONENT, 
                                &m_pCaptureDevice,
                                m_pDemodulatorDevice, 
                                TRUE
                                )))
    {
        ErrorMessageBox(TEXT("Cannot load capture device and connect tunern"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    // Step5: Load demux
    if(FAILED (hr = LoadDemux()))
    {
        ErrorMessageBox(TEXT("Cannot load demuxn"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    //
    // this next call loads and connects filters associated with
    // the demultiplexor. if you want to manually load individual
    // filters such as audio and video decoders, use the code at
    // the bottom of this file
    //
#ifdef REGISTER_FILTERGRAPH
    hr = AddGraphToRot (m_pFilterGraph, &m_dwGraphRegister);
    if (FAILED(hr))
    {
        ///ErrorMessageBox(TEXT("Failed to register filter graph with ROT!  hr=0x%x"), hr);
        m_dwGraphRegister = 0;
    }
#endif
    // Step6: Render demux pins
    if(FAILED (hr = RenderDemux()))
    {
        ErrorMessageBox(TEXT("Cannot load demuxn"));
        TearDownGraph();
        m_fGraphFailure = true;
        return hr;
    }
    m_fGraphBuilt = true;
    m_fGraphFailure = false;
    
    return S_OK;
}
// Loads the correct tuning space based on NETWORK_TYPE that got
// passed into BuildGraph()
HRESULT
CBDAFilterGraph::LoadTuningSpace()
{   
    CComPtr <ITuningSpaceContainer>  pITuningSpaceContainer;
    // get the tuningspace container for all the tuning spaces from SYSTEM_TUNING_SPACES
    HRESULT hr = pITuningSpaceContainer.CoCreateInstance(CLSID_SystemTuningSpaces);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Could not CoCreate SystemTuningSpacesn"));
        return hr;
    }
    CComVariant var (m_NetworkType);
    hr = pITuningSpaceContainer->get_Item(var, &m_pITuningSpace);
    if(FAILED(hr))
    {
        ErrorMessageBox(TEXT("Unable to retrieve Tuning Spacen"));
    }
    return hr;
}
// Creates an ATSC Tune Request
HRESULT
CBDAFilterGraph::CreateATSCTuneRequest(
        LONG lPhysicalChannel,
        LONG lMajorChannel, 
        LONG lMinorChannel,
        IATSCChannelTuneRequest**   pTuneRequest
    )
{
    HRESULT hr = S_OK;
    if (pTuneRequest == NULL)
    {
        ErrorMessageBox (TEXT("Invalid pointern"));
        return E_POINTER;
    }
    // Making sure we have a valid tuning space
    if (m_pITuningSpace == NULL)
    {
        ErrorMessageBox(TEXT("Tuning Space is NULLn"));
        return E_FAIL;
    }
    //  Create an instance of the ATSC tuning space
    CComQIPtr <IATSCTuningSpace> pATSCTuningSpace (m_pITuningSpace);
    if (!pATSCTuningSpace)
    {
        ErrorMessageBox(TEXT("Cannot QI for an IATSCTuningSpacen"));
        return E_FAIL;
    }
    //  Create an empty tune request.
    CComPtr <ITuneRequest> pNewTuneRequest;
    hr = pATSCTuningSpace->CreateTuneRequest(&pNewTuneRequest);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("CreateTuneRequest: Can't create tune request.n"));
        return hr;
    }
    //query for an IATSCChannelTuneRequest interface pointer
    CComQIPtr <IATSCChannelTuneRequest> pATSCTuneRequest (pNewTuneRequest);
    if (!pATSCTuneRequest)
    {
        ErrorMessageBox(TEXT("CreateATSCTuneRequest: Can't QI for IATSCChannelTuneRequest.n"));
        return E_FAIL;
    }
    //  Set the initial major and minor channels
    hr = pATSCTuneRequest->put_Channel(lMajorChannel);
    if(FAILED(hr))
    {
        ErrorMessageBox(TEXT("put_Channel failedn"));
        return hr;
    }
    hr = pATSCTuneRequest->put_MinorChannel(lMinorChannel);
    if(FAILED(hr))
    {
        ErrorMessageBox(TEXT("put_MinorChannel failedn"));
        return hr;
    }
    CComPtr <IATSCLocator> pATSCLocator;
    hr = pATSCLocator.CoCreateInstance (CLSID_ATSCLocator);
    if (FAILED( hr))
    {
        ErrorMessageBox(TEXT("Cannot create the ATSC locator failedn"));
        return hr;
    }
    //  Set the initial physical channel.
    //
    hr = pATSCLocator->put_PhysicalChannel (lPhysicalChannel);
    if (FAILED( hr))
    {
        ErrorMessageBox(TEXT("Cannot put the physical channeln"));
        return hr;
    }
    hr = pATSCTuneRequest->put_Locator (pATSCLocator);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Cannot put the locatorn"));
        return hr;
    }
    hr = pATSCTuneRequest.QueryInterface (pTuneRequest);
    return hr;
}
// LoadNetworkProvider loads network provider
HRESULT
CBDAFilterGraph::LoadNetworkProvider()
{
    HRESULT     hr = S_OK;
    CComBSTR    bstrNetworkType;
    CLSID       CLSIDNetworkType;
    // obtain tuning space then load network provider
    if(m_pITuningSpace == NULL)
    {
        hr = LoadTuningSpace();
        if(FAILED(hr))
        {
            ErrorMessageBox(TEXT("Cannot load TuningSpacen"));
            return hr;
        }
    }
    // Get the current Network Type clsid
    hr = m_pITuningSpace->get_NetworkType(&bstrNetworkType);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("ITuningSpace::Get Network Type failedn"));
        return hr;
    }
    hr = CLSIDFromString(bstrNetworkType, &CLSIDNetworkType);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Couldn't get CLSIDFromStringn"));
        return hr;
    }
    // create the network provider based on the clsid obtained from the tuning space
    hr = CoCreateInstance(CLSIDNetworkType, NULL, CLSCTX_INPROC_SERVER,
                          IID_IBaseFilter, 
                          reinterpret_cast<void**>(&m_pNetworkProvider));
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Couldn't CoCreate Network Providern"));
        return hr;
    }
    //add the Network Provider filter to the graph
    hr = m_pFilterGraph->AddFilter(m_pNetworkProvider, L"Network Provider");
    return hr;
}
// enumerates through registered filters
// instantiates the the filter object and adds it to the graph
// it checks to see if it connects to upstream filter
// if not,  on to the next enumerated filter
// used for tuner, capture, MPE Data Filters and decoders that
// could have more than one filter object
// if pUpstreamFilter is NULL don't bother connecting
HRESULT
CBDAFilterGraph::LoadFilter(
    REFCLSID clsid, 
    IBaseFilter** ppFilter,
    IBaseFilter* pConnectFilter, 
    BOOL fIsUpstream
    )
{
    HRESULT                 hr = S_OK;
    BOOL                    fFoundFilter = FALSE;
    CComPtr <IMoniker>      pIMoniker;
    CComPtr <IEnumMoniker>  pIEnumMoniker;
    if (!m_pICreateDevEnum)
    {
        hr = m_pICreateDevEnum.CoCreateInstance(CLSID_SystemDeviceEnum);
        if (FAILED (hr))
        {
            ErrorMessageBox(TEXT("LoadFilter(): Cannot CoCreate ICreateDevEnum"));
            return hr;
        }
    }
    // obtain the enumerator
    hr = m_pICreateDevEnum->CreateClassEnumerator(clsid, &pIEnumMoniker, 0);
    // the call can return S_FALSE if no moniker exists, so explicitly check S_OK
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("LoadFilter(): Cannot CreateClassEnumerator"));
        return hr;
    }
    if (S_OK != hr)  // Class not found
    {
        ErrorMessageBox(TEXT("LoadFilter(): Class not found, CreateClassEnumerator returned S_FALSE"));
        return E_UNEXPECTED;
    }
    // next filter
    while(pIEnumMoniker->Next(1, &pIMoniker, 0) == S_OK)
    {
        // obtain filter's friendly name
        CComPtr <IPropertyBag>  pBag;
        hr = pIMoniker->BindToStorage(
                                    NULL, 
                                    NULL, 
                                    IID_IPropertyBag,
                                    reinterpret_cast<void**>(&pBag)
                                    );
        if(FAILED(hr))
        {
            OutputDebugString (TEXT("LoadFilter(): Cannot BindToStorage"));
            return hr;
        }
        CComVariant varBSTR;
        hr = pBag->Read(L"FriendlyName", &varBSTR, NULL);
        if(FAILED(hr))
        {
            OutputDebugString (TEXT("LoadFilter(): IPropertyBag->Read method failed"));
            pIMoniker = NULL;
            continue;
        }
        // bind the filter
        CComPtr <IBaseFilter>   pFilter;
        hr = pIMoniker->BindToObject(
                                    NULL, 
                                    NULL, 
                                    IID_IBaseFilter,
                                    reinterpret_cast<void**>(&pFilter)
                                    );
        if (FAILED(hr))
        {
            pIMoniker = NULL;
            pFilter = NULL;
            continue;
        }
        hr = m_pFilterGraph->AddFilter (pFilter, varBSTR.bstrVal);
        if (FAILED(hr))
        {
            OutputDebugString (TEXT("Cannot add filtern"));
            return hr;
        }
        //MessageBox (NULL, _T(""), _T(""), MB_OK);
        // test connections
        // to upstream filter
        if (pConnectFilter)
        {
            if(fIsUpstream)
            {
                hr = ConnectFilters (pConnectFilter, pFilter);
            }
            else
            {
                hr = ConnectFilters (pFilter, pConnectFilter);
            }
            if(SUCCEEDED(hr))
            {
                //that's the filter we want
                fFoundFilter = TRUE;
                pFilter.QueryInterface (ppFilter);
                break;
            }
            else
            {
                fFoundFilter = FALSE;
                // that wasn't the the filter we wanted
                // so unload and try the next one
                hr = m_pFilterGraph->RemoveFilter(pFilter);
                if(FAILED(hr))
                {
                    OutputDebugString(TEXT("Failed unloading Filtern"));
                    return hr;
                }
            }
        }
        else
        {
            fFoundFilter = TRUE;
            pFilter.QueryInterface (ppFilter);
            break;
        }
        pIMoniker = NULL;
        pFilter = NULL;
    } // while
    return S_OK;
}
// loads the demux into the FilterGraph
HRESULT
CBDAFilterGraph::LoadDemux()
{
    HRESULT hr = S_OK;
    
    hr = CoCreateInstance(
                        CLSID_MPEG2Demultiplexer, 
                        NULL, 
                        CLSCTX_INPROC_SERVER,
                        IID_IBaseFilter, 
                        reinterpret_cast<void**>(&m_pDemux)
                        );
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Could not CoCreateInstance CLSID_MPEG2Demultiplexern"));
        return hr;
    }
    hr = m_pFilterGraph->AddFilter(m_pDemux, L"Demux");
    if(FAILED(hr))
    {
        ErrorMessageBox(TEXT("Unable to add demux filter to graphn"));
        return hr;
    }
    return hr;
}
// renders demux output pins
HRESULT
CBDAFilterGraph::RenderDemux()
{
    HRESULT             hr = S_OK;
    CComPtr <IPin>      pIPin;
    CComPtr <IPin>      pDownstreamPin;
    CComPtr <IEnumPins> pIEnumPins;
    PIN_DIRECTION       direction;
    if (!m_pDemux)
    {
        return E_FAIL;
    }
    // connect the demux to the capture device
    hr = ConnectFilters (m_pCaptureDevice, m_pDemux);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Cannot connect demux to capture filtern"));
        return hr;
    }
    // load transform information filter and connect it to the demux
    hr = LoadFilter (
                    KSCATEGORY_BDA_TRANSPORT_INFORMATION, 
                    &m_pTIF, 
                    m_pDemux, 
                    TRUE
                    );
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Cannot load TIFn"));
        return hr;
    }
    // load multi protocol encapsulator
    hr = LoadFilter (
                    KSCATEGORY_BDA_RECEIVER_COMPONENT, 
                    &m_pMPE, 
                    m_pDemux, 
                    TRUE
                    );
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Cannot load MPEn"));
        return hr;
    }
    // load IP Sink
    hr = LoadFilter (
                    KSCATEGORY_IP_SINK, 
                    &m_pIPSink, 
                    m_pMPE, 
                    TRUE
                    );
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Cannot load IP Sinkn"));
        return hr;
    }
    // render/connect the rest of the demux pins
    hr = m_pDemux->EnumPins (&pIEnumPins);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Cannot get the enumpinsn"));
        return hr;
    }
    while(pIEnumPins->Next(1, &pIPin, 0) == S_OK)
    {
        hr = pIPin->QueryDirection(&direction);
        if(direction == PINDIR_OUTPUT)
        {
            pIPin->ConnectedTo (&pDownstreamPin);
            if(pDownstreamPin == NULL)
            {
                m_pFilterGraph->Render (pIPin);
            }
            pDownstreamPin = NULL;
        }
        pIPin = NULL;
    }
    return hr;
}
// removes each filter from the graph
HRESULT
CBDAFilterGraph::TearDownGraph()
{
    HRESULT hr = S_OK;
    CComPtr <IBaseFilter> pFilter;
    CComPtr <IEnumFilters> pIFilterEnum;
    m_pITuningSpace = NULL;
    if(m_fGraphBuilt || m_fGraphFailure)
    {
        // unload manually added filters
        m_pFilterGraph->RemoveFilter(m_pIPSink);
        m_pFilterGraph->RemoveFilter(m_pMPE);
        m_pFilterGraph->RemoveFilter(m_pTIF);
        m_pFilterGraph->RemoveFilter(m_pDemux);
        m_pFilterGraph->RemoveFilter(m_pNetworkProvider);
        m_pFilterGraph->RemoveFilter(m_pTunerDevice);
        m_pFilterGraph->RemoveFilter(m_pCaptureDevice);
        m_pIPSink = NULL;
        m_pMPE = NULL;
        m_pTIF = NULL;
        m_pDemux = NULL;
        m_pNetworkProvider = NULL;
        m_pTunerDevice = NULL;
        m_pDemodulatorDevice = NULL;
        m_pCaptureDevice = NULL;
        // now go unload rendered filters
        hr = m_pFilterGraph->EnumFilters(&pIFilterEnum);
        if(FAILED(hr))
        {
            ErrorMessageBox(TEXT("TearDownGraph: cannot EnumFiltersn"));
            return E_FAIL;
        }
        pIFilterEnum->Reset();
        while(pIFilterEnum->Next(1, &pFilter, 0) == S_OK) // addrefs filter
        {
            hr = m_pFilterGraph->RemoveFilter(pFilter);
            if (FAILED (hr))
                return hr;
            pIFilterEnum->Reset();
            pFilter.Release ();
        }
    }
#ifdef REGISTER_FILTERGRAPH
    if (m_dwGraphRegister)
    {
        RemoveGraphFromRot(m_dwGraphRegister);
        m_dwGraphRegister = 0;
    }
#endif
    m_fGraphBuilt = FALSE;
    return S_OK;
}
// ConnectFilters is called from BuildGraph
// to enumerate and connect pins
HRESULT
CBDAFilterGraph::ConnectFilters(
    IBaseFilter* pFilterUpstream, 
    IBaseFilter* pFilterDownstream
    )
{
    HRESULT         hr = E_FAIL;
    CComPtr <IPin>  pIPinUpstream;
    PIN_INFO        PinInfoUpstream;
    PIN_INFO        PinInfoDownstream;
    // validate passed in filters
    ASSERT (pFilterUpstream);
    ASSERT (pFilterDownstream);
    // grab upstream filter's enumerator
    CComPtr <IEnumPins> pIEnumPinsUpstream;
    hr = pFilterUpstream->EnumPins(&pIEnumPinsUpstream);
    if(FAILED(hr))
    {
        ErrorMessageBox(TEXT("Cannot Enumerate Upstream Filter's Pinsn"));
        return hr;
    }
    // iterate through upstream filter's pins
    while (pIEnumPinsUpstream->Next (1, &pIPinUpstream, 0) == S_OK)
    {
        hr = pIPinUpstream->QueryPinInfo (&PinInfoUpstream);
        if(FAILED(hr))
        {
            ErrorMessageBox(TEXT("Cannot Obtain Upstream Filter's PIN_INFOn"));
            return hr;
        }
        CComPtr <IPin>  pPinDown;
        pIPinUpstream->ConnectedTo (&pPinDown);
        // bail if pins are connected
        // otherwise check direction and connect
        if ((PINDIR_OUTPUT == PinInfoUpstream.dir) && (pPinDown == NULL))
        {
            // grab downstream filter's enumerator
            CComPtr <IEnumPins> pIEnumPinsDownstream;
            hr = pFilterDownstream->EnumPins (&pIEnumPinsDownstream);
            if(FAILED(hr))
            {
                ErrorMessageBox(TEXT("Cannot enumerate pins on downstream filter!n"));
                return hr;
            }
            // iterate through downstream filter's pins
            CComPtr <IPin>  pIPinDownstream;
            while (pIEnumPinsDownstream->Next (1, &pIPinDownstream, 0) == S_OK)
            {
                // make sure it is an input pin
                hr = pIPinDownstream->QueryPinInfo(&PinInfoDownstream);
                if(SUCCEEDED(hr))
                {
                    CComPtr <IPin>  pPinUp;
                    // Determine if the pin is already connected.  Note that 
                    // VFW_E_NOT_CONNECTED is expected if the pin isn't yet connected.
                    hr = pIPinDownstream->ConnectedTo (&pPinUp);
                    if(FAILED(hr) && hr != VFW_E_NOT_CONNECTED)
                    {
                        ErrorMessageBox(TEXT("Failed in pIPinDownstream->ConnectedTo()!n"));
                        continue;
                    }
                    if ((PINDIR_INPUT == PinInfoDownstream.dir) && (pPinUp == NULL))
                    {
                        if (SUCCEEDED (m_pFilterGraph->Connect(
                                        pIPinUpstream,
                                        pIPinDownstream))
                                        )
                        {
                            PinInfoDownstream.pFilter->Release();
                            PinInfoUpstream.pFilter->Release();
                            return S_OK;
                        }
                    }
                }
                PinInfoDownstream.pFilter->Release();
                pIPinDownstream = NULL;
            } // while next downstream filter pin
            //We are now back into the upstream pin loop
        } // if output pin
        pIPinUpstream = NULL;
        PinInfoUpstream.pFilter->Release();
    } // while next upstream filter pin
    return E_FAIL;
}
// RunGraph checks to see if a graph has been built
// if not it calls BuildGraph
// RunGraph then calls MediaCtrl-Run
HRESULT
CBDAFilterGraph::RunGraph()
{
    // check to see if the graph is already running
    if(m_fGraphRunning)
        return S_OK;
    HRESULT hr = S_OK;
    if (m_pIMediaControl == NULL)
        hr = m_pFilterGraph.QueryInterface (&m_pIMediaControl);
    if (SUCCEEDED (hr))
    {
        // run the graph
        hr = m_pIMediaControl->Run();
        if(SUCCEEDED(hr))
        {
            m_fGraphRunning = true;
        }
        else
        {
            // stop parts of the graph that ran
            m_pIMediaControl->Stop();
            ErrorMessageBox(TEXT("Cannot run graphn"));
        }
    }
    return hr;
}
// StopGraph calls MediaCtrl - Stop
HRESULT
CBDAFilterGraph::StopGraph()
{
    // check to see if the graph is already stopped
    if(m_fGraphRunning == false)
        return S_OK;
    HRESULT hr = S_OK;
    ASSERT (m_pIMediaControl);
    // pause before stopping
    hr = m_pIMediaControl->Pause();
    // stop the graph
    hr = m_pIMediaControl->Stop();
    m_fGraphRunning = (FAILED (hr))?true:false;
    return hr;
}
// Set our client area for viewing
//
// Note, what you're not seeing here is a call to
// IAMSreamCconfig's GetFormat to obtain the video
// format properties that would enable us to set
// the viewing window's size
HRESULT
CBDAFilterGraph::SetVideoWindow(
        HWND hwndMain
        )
{
    CComPtr <IVideoWindow>  pVideoWindow;
    RECT                    rc;
    INT                     cyBorder;
    INT                     cy;
    HRESULT                 hr = S_OK;
    // get IVideoWindow interface
    hr = m_pFilterGraph->QueryInterface (&pVideoWindow);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("QueryInterface IVideoWindow Failedn"));
        return hr;
    }
    hr = pVideoWindow->put_Owner (reinterpret_cast <LONG> (hwndMain));
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Unable to set video windown"));
        return hr;
    }
    hr = pVideoWindow->put_WindowStyle (WS_CHILD);
    if (FAILED (hr))
    {
        ErrorMessageBox(TEXT("Unable to set the style for the video windown"));
        return hr;
    }
    GetClientRect(hwndMain, &rc);
    cyBorder = GetSystemMetrics(SM_CYBORDER);
    cy = cyBorder;
    rc.bottom -= cy;
    hr = pVideoWindow->SetWindowPosition(0, 0, rc.right, rc.bottom);
    hr = pVideoWindow->put_Visible (OATRUE);
    return hr;
}
HRESULT
CBDAFilterGraph::ChangeChannel(
        LONG lPhysicalChannel,
        LONG lMajorChannel, 
        LONG lMinorChannel
        )
{
    HRESULT hr = S_OK;
    m_lMajorChannel = lMajorChannel;
    m_lMinorChannel = lMinorChannel;
    m_lPhysicalChannel = lPhysicalChannel;
    if (!m_pNetworkProvider)
    {
        ErrorMessageBox(TEXT("The FilterGraph is not yet built.n"));
        return E_FAIL;
    }
    // create tune request
    CComPtr <IATSCChannelTuneRequest> pTuneRequest;
    hr = CreateATSCTuneRequest(
                            m_lPhysicalChannel, 
                            lMajorChannel, 
                            lMinorChannel,
                            &pTuneRequest
                            );
    if(SUCCEEDED(hr))
    {
        hr = m_pITuner->put_TuneRequest (pTuneRequest);
        if (FAILED (hr))
            ErrorMessageBox(TEXT("Cannot submit tune requestn"));
    }
    else
    {
        ErrorMessageBox(TEXT("Cannot Change Channelsn"));
    }
    return hr;
}
#ifdef REGISTER_FILTERGRAPH
// Adds a DirectShow filter graph to the Running Object Table,
// allowing GraphEdit to "spy" on a remote filter graph.
HRESULT CBDAFilterGraph::AddGraphToRot(
        IUnknown *pUnkGraph, 
        DWORD *pdwRegister
        ) 
{
    CComPtr <IMoniker>              pMoniker;
    CComPtr <IRunningObjectTable>   pROT;
    WCHAR wsz[128];
    HRESULT hr;
    if (FAILED(GetRunningObjectTable(0, &pROT)))
        return E_FAIL;
    wsprintfW(wsz, L"FilterGraph %08x pid %08x", (DWORD_PTR) pUnkGraph, 
              GetCurrentProcessId());
    hr = CreateItemMoniker(L"!", wsz, &pMoniker);
    if (SUCCEEDED(hr)) 
        hr = pROT->Register(ROTFLAGS_REGISTRATIONKEEPSALIVE, pUnkGraph, 
                            pMoniker, pdwRegister);
        
    return hr;
}
// Removes a filter graph from the Running Object Table
void CBDAFilterGraph::RemoveGraphFromRot(
        DWORD pdwRegister
        )
{
    CComPtr <IRunningObjectTable> pROT;
    if (SUCCEEDED(GetRunningObjectTable(0, &pROT))) 
        pROT->Revoke(pdwRegister);
}
#endif
//
// USE THE CODE BELOW IF YOU WANT TO MANUALLY LOAD AND
// CONNECT A/V DECODERS TO THE DEMUX OUTPUT PINS
//
/*
To use this code:
1) in LoadAudioDecoder() and LoadVideoDecoder(), fill in decoder specific information (clsid)
2) goto BuildGraph() and replace RenderDemux() with BuildAVSegment()
*/
/*
// Builds the Audio, Video segment of the digital TV graph.
// Demux -> AV Decoder -> OVMixer -> Video Renderer
HRESULT
CBDAFilterGraph::BuildAVSegment()
{
    HRESULT hr = E_FAIL;
    // connect the demux to the capture device
    hr = ConnectFilters(m_pCaptureDevice, m_pDemux);
    hr = LoadVideoDecoder();
    if(SUCCEEDED(hr) && m_pVideoDecoder)
    {
        // Connect the demux & video decoder
        hr = ConnectFilters(m_pDemux, m_pVideoDecoder);
        if(FAILED(hr))
        {
            ErrorMessageBox("Connecting Demux & Video Decoder Failedn");
            goto err;
        }
    }
    else
    {
        //ErrorMessageBox("Unable to load Video Decodern");
        goto err;
    }
    //Audio
    hr = LoadAudioDecoder();
    if(SUCCEEDED(hr) && m_pAudioDecoder)
    {
        hr = ConnectFilters(m_pDemux, m_pAudioDecoder);
        if(FAILED(hr))
        {
            ErrorMessageBox("Connecting Deumx & Audio Decoder Failedn");
            goto err;
        }
    }
    else
    {
        ErrorMessageBox("Unable to load Audio Decodern");
        goto err;
    }
    // Create the OVMixer & Video Renderer for the video segment
    hr = CoCreateInstance(CLSID_OverlayMixer, NULL, CLSCTX_INPROC_SERVER,
            IID_IBaseFilter, reinterpret_cast<void**>(&m_pOVMixer));
    if(SUCCEEDED(hr) && m_pOVMixer)
    {
        hr = m_pFilterGraph->AddFilter(m_pOVMixer, L"OVMixer");
        if(FAILED(hr))
        {
            ErrorMessageBox("Adding OVMixer to the FilterGraph Failedn");
            goto err;
        }
    }
    else
    {
        ErrorMessageBox("Loading OVMixer Failedn");
        goto err;
    }
    hr = CoCreateInstance(CLSID_VideoRenderer, NULL, CLSCTX_INPROC_SERVER,
            IID_IBaseFilter, reinterpret_cast<void**>(&m_pVRenderer));
    if(SUCCEEDED(hr) && m_pVRenderer)
    {
        hr = m_pFilterGraph->AddFilter(m_pVRenderer, L"Video Renderer");
        if(FAILED(hr))
        {
            ErrorMessageBox("Adding Video Renderer to the FilterGraph Failedn");
            goto err;
        }
    }
    else
    {
        ErrorMessageBox("Loading Video Renderer Failedn");
        goto err;
    }
    // Split AV Decoder? Then add Default DirectSound Renderer to the filtergraph
    if(m_pVideoDecoder != m_pAudioDecoder)
    {
        hr = CoCreateInstance(CLSID_DSoundRender, NULL,
                        CLSCTX_INPROC_SERVER, IID_IBaseFilter,
                        reinterpret_cast<void**>(&m_pDDSRenderer));
        if(SUCCEEDED(hr) && m_pDDSRenderer)
        {
            hr = m_pFilterGraph->AddFilter(m_pDDSRenderer, L"Sound Renderer");
            if(FAILED(hr))
            {
                ErrorMessageBox("Adding DirectSound Device to the FilterGraph Failedn");
                goto err;
            }
        }
        else
        {
            ErrorMessageBox("Loading DirectSound Device Failedn");
            goto err;
        }
    }
    hr = ConnectFilters(m_pVideoDecoder, m_pOVMixer);
    if(FAILED(hr))
    {
        ErrorMessageBox("Connecting Capture & OVMixer Failedn");
        goto err;
    }
    hr = ConnectFilters(m_pOVMixer, m_pVRenderer);
    if(FAILED(hr))
    {
        ErrorMessageBox("Connecting OVMixer & Video Renderer Failedn");
        goto err;
    }
    // Split AV Decoder & if you need audio too ?? then connect Audio decoder to Sound Renderer
    if(m_pVideoDecoder != m_pAudioDecoder)
    {
        hr = ConnectFilters(m_pAudioDecoder, m_pDDSRenderer);
        if(FAILED(hr))
        {
            ErrorMessageBox("Connecting AudioDecoder & DirectSound Device Failedn");
            goto err;
        }
    }
err:
    return hr;
}
// placeholders for real decoders
DEFINE_GUID(CLSID_FILL_IN_NAME_AUDIO_DECODER, 0xFEEDFEED, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00);
DEFINE_GUID(CLSID_FILL_IN_NAME_VIDEO_DECODER, 0xFEEDFEED, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00);
HRESULT
CBDAFilterGraph::LoadVideoDecoder()
{
    HRESULT hr = E_FAIL;
    hr = CoCreateInstance(CLSID_FILL_IN_NAME_VIDEO_DECODER, NULL,
            CLSCTX_INPROC_SERVER, IID_IBaseFilter,
            reinterpret_cast<void**>(&m_pVideoDecoder));
    if(SUCCEEDED(hr) && m_pVideoDecoder)
    {
        hr = m_pFilterGraph->AddFilter(m_pVideoDecoder, L"Video Decoder");
        if(FAILED(hr))
        {
            ErrorMessageBox("Unable to add Video Decoder filter to graphn");
        }
    }
    return hr;
}
HRESULT
CBDAFilterGraph::LoadAudioDecoder()
{
    HRESULT hr = E_FAIL;
    hr = CoCreateInstance(CLSID_FILL_IN_NAME_AUDIO_DECODER, NULL,
            CLSCTX_INPROC_SERVER, IID_IBaseFilter,
            reinterpret_cast<void**>(&m_pAudioDecoder));
    if(SUCCEEDED(hr) && m_pAudioDecoder)
    {
        hr = m_pFilterGraph->AddFilter(m_pAudioDecoder, L"Audio Decoder");
        if(FAILED(hr))
        {
            ErrorMessageBox("Unable to add Audio filter to graphn");
        }
    }
    return hr;
}
*/

						