多媒体编程

开发平台：
Visual C++

graph.h：源码内容
							//------------------------------------------------------------------------------
// File: Graph.h
//
// Desc: Sample code for BDA graph building.
//
// Copyright (c) 2000-2002, Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
#ifndef GRAPH_H_INCLUDED_
#define GRAPH_H_INCLUDED_
#include "bdasampl.h"
class CBDAFilterGraph
{
private:
    CComPtr <ITuningSpace>   m_pITuningSpace;
    CComPtr <IScanningTuner> m_pITuner;
    CComPtr <IGraphBuilder>  m_pFilterGraph;         // for current graph
    CComPtr <IMediaControl>  m_pIMediaControl;       // for controlling graph state
    CComPtr <ICreateDevEnum> m_pICreateDevEnum;      // for enumerating system devices
    CComPtr <IBaseFilter>    m_pNetworkProvider;     // for network provider filter
    CComPtr <IBaseFilter>    m_pTunerDevice;         // for tuner device filter
    CComPtr <IBaseFilter>    m_pDemodulatorDevice;   // for tuner device filter
    CComPtr <IBaseFilter>    m_pCaptureDevice;       // for capture device filter
    CComPtr <IBaseFilter>    m_pDemux;               // for demux filter
    CComPtr <IBaseFilter>    m_pVideoDecoder;        // for mpeg video decoder filter
    CComPtr <IBaseFilter>    m_pAudioDecoder;        // for mpeg audio decoder filter
    CComPtr <IBaseFilter>    m_pTIF;                 // for transport information filter
    CComPtr <IBaseFilter>    m_pMPE;                 // for multiple protocol encapsulator
    CComPtr <IBaseFilter>    m_pIPSink;              // for ip sink filter
    CComPtr <IBaseFilter>    m_pOVMixer;             // for overlay mixer filter
    CComPtr <IBaseFilter>    m_pVRenderer;           // for video renderer filter
    CComPtr <IBaseFilter>    m_pDDSRenderer;         // for sound renderer filter
    //required for an ATSC network when creating a tune request
    LONG                     m_lMajorChannel;
    LONG                     m_lMinorChannel;
    LONG                     m_lPhysicalChannel;
    //registration number for the RunningObjectTable
    DWORD                    m_dwGraphRegister;
    NETWORK_TYPE             m_NetworkType;
    HRESULT InitializeGraphBuilder();
    HRESULT LoadTuningSpace();
    HRESULT LoadNetworkProvider();
    HRESULT LoadDemux();
    HRESULT RenderDemux();
    HRESULT LoadFilter(
        REFCLSID clsid, 
        IBaseFilter** ppFilter,
        IBaseFilter* pConnectFilter, 
        BOOL fIsUpstream
        );
    HRESULT ConnectFilters(
        IBaseFilter* pFilterUpstream, 
        IBaseFilter* pFilterDownstream
        );
    HRESULT CreateATSCTuneRequest(
        LONG lPhysicalChannel,
        LONG lMajorChannel, 
        LONG lMinorChannel,
        IATSCChannelTuneRequest**   pTuneRequest
        );
public:
    bool            m_fGraphBuilt;
    bool            m_fGraphRunning;
    bool            m_fGraphFailure;
    CBDAFilterGraph();   
    ~CBDAFilterGraph();
    HRESULT BuildGraph(
        NETWORK_TYPE NetworkType
        );
    HRESULT RunGraph();
    HRESULT StopGraph();
    HRESULT TearDownGraph();
    HRESULT SetVideoWindow(
        HWND hwndMain
        );
    
    HRESULT ChangeChannel(
        LONG lPhysicalChannel,
        LONG lMajorChannel, 
        LONG lMinorChannel
        );
    
    // Adds/removes a DirectShow filter graph from the Running Object Table,
    // allowing GraphEdit to "spy" on a remote filter graph if enabled.
    HRESULT AddGraphToRot(
        IUnknown *pUnkGraph, 
        DWORD *pdwRegister
        );
    void RemoveGraphFromRot(
        DWORD pdwRegister
        );
    LONG GetMajorChannel ()    { return m_lMajorChannel;    };
    LONG GetPhysicalChannel () { return m_lPhysicalChannel; };
    LONG GetMinorChannel ()    { return m_lMinorChannel;    };
 };
 
 
#endif // GRAPH_H_INCLUDED_

						