使用directShow播放mpeg的基类

//
// CDXGraph.h
//

#ifndef __H_CDXGraph__
#define __H_CDXGraph__

// Filter graph notification to the specified window
#define WM_GRAPHNOTIFY  (WM_USER+20)

#include "Dshow.h"
#include "amstream.h"
#include "Qedit.h"

class CDXGraph
{
private:
    IGraphBuilder *     mGraph;  
    IMediaControl *        mMediaControl;
    IMediaEventEx *        mEvent;
    IBasicVideo *        mBasicVideo;
    IBasicAudio *        mBasicAudio;
    IVideoWindow  *        mVideoWindow;
    IMediaSeeking *        mSeeking;

    DWORD                mObjectTableEntry;

public:
    CDXGraph();
    virtual ~CDXGraph();

public:
    virtual bool Create(void);
    virtual void Release(void);
    virtual bool Attach(IGraphBuilder * inGraphBuilder);

    IGraphBuilder * GetGraph(void); // Not outstanding reference count
    IMediaEventEx * GetEventHandle(void);

    bool ConnectFilters(IPin * inOutputPin, IPin * inInputPin, const AM_MEDIA_TYPE * inMediaType = 0);
    void DisconnectFilters(IPin * inOutputPin);

    bool SetDisplayWindow(HWND inWindow);
    bool SetNotifyWindow(HWND inWindow);
    bool ResizeVideoWindow(long inLeft, long inTop, long inWidth, long inHeight);
    void HandleEvent(WPARAM inWParam, LPARAM inLParam);

    bool Run(void);        // Control filter graph
    bool Stop(void);
    bool Pause(void);
    bool IsRunning(void);  // Filter graph status
    bool IsStopped(void);
    bool IsPaused(void);

    bool SetFullScreen(BOOL inEnabled);
    bool GetFullScreen(void);

    // IMediaSeeking
    bool GetCurrentPosition(double * outPosition);
    bool GetStopPosition(double * outPosition);
    bool SetCurrentPosition(double inPosition);
    bool SetStartStopPosition(double inStart, double inStop);
    bool GetDuration(double * outDuration);
    bool SetPlaybackRate(double inRate);

    // Attention: range from -10000 to 0, and 0 is FULL_VOLUME.
    bool SetAudioVolume(long inVolume);
    long GetAudioVolume(void);
    // Attention: range from -10000(left) to 10000(right), and 0 is both.
    bool SetAudioBalance(long inBalance);
    long GetAudioBalance(void);

    bool RenderFile(const char * inFile);
    bool SnapshotBitmap(const char * outFile);

private:
    void AddToObjectTable(void) ;
    void RemoveFromObjectTable(void);
    
    bool QueryInterfaces(void);
};

#endif // __H_CDXGraph__








//
// CDXGraph.cpp
//

#include "stdafx.h"
//#include "streams.h"
#include "CDXGraph.h"
#include "vfw.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

////////////////////////////////////////////////////////////////////////////////
CDXGraph::CDXGraph()
{
    mGraph        = NULL;
    mMediaControl = NULL;
    mEvent        = NULL;
    mBasicVideo   = NULL;
    mBasicAudio   = NULL;
    mVideoWindow  = NULL;
    mSeeking      = NULL;

    mObjectTableEntry = 0;
}

CDXGraph::~CDXGraph()
{
    Release();
}

bool CDXGraph::Create(void)
{
    CoInitialize(NULL);
    if (!mGraph)
    {
        HRESULT hr = CoCreateInstance(CLSID_FilterGraph, NULL,
            CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&mGraph);
        if (SUCCEEDED(hr))
        {
#ifdef _DEBUG
            AddToObjectTable();
#endif
   
            return QueryInterfaces();
        }
        mGraph = 0;
    }
    return false;
}

bool CDXGraph::QueryInterfaces(void)
{
    if (mGraph)
    {
        HRESULT hr = NOERROR;
        hr |= mGraph->QueryInterface(IID_IMediaControl, (void **)&mMediaControl);
        hr |= mGraph->QueryInterface(IID_IMediaEventEx, (void **)&mEvent);
        hr |= mGraph->QueryInterface(IID_IBasicVideo, (void **)&mBasicVideo);
        hr |= mGraph->QueryInterface(IID_IBasicAudio, (void **)&mBasicAudio);
        hr |= mGraph->QueryInterface(IID_IVideoWindow, (void **)&mVideoWindow);
        hr |= mGraph->QueryInterface(IID_IMediaSeeking, (void **)&mSeeking);
        if (mSeeking)
        {
            mSeeking->SetTimeFormat(&TIME_FORMAT_MEDIA_TIME);
        }
        return SUCCEEDED(hr);
    }
    return false;
}

void CDXGraph::Release(void)
{
    if (mSeeking)
    {
        mSeeking->Release();
        mSeeking = NULL;
    }
    if (mMediaControl)
    {
        mMediaControl->Release();
        mMediaControl = NULL;
    }
    if (mEvent)
    {
        mEvent->Release();
        mEvent = NULL;
    }
    if (mBasicVideo)
    {
        mBasicVideo->Release();
        mBasicVideo = NULL;
    }
    if (mBasicAudio)
    {
        mBasicAudio->Release();
        mBasicAudio = NULL;
    }
    if (mVideoWindow)
    {
        mVideoWindow->put_Visible(OAFALSE);
        mVideoWindow->put_MessageDrain((OAHWND)NULL);
        mVideoWindow->put_Owner(OAHWND(0));
        mVideoWindow->Release();
        mVideoWindow = NULL;
    }

#ifdef _DEBUG
    RemoveFromObjectTable();
#endif
   
    if (mGraph)
    {
        mGraph->Release();
        mGraph = NULL;
    }
    CoUninitialize();
}

bool CDXGraph::Attach(IGraphBuilder * inGraphBuilder)
{
    Release();

    if (inGraphBuilder)
    {
        inGraphBuilder->AddRef();
        mGraph = inGraphBuilder;

        AddToObjectTable();
        return QueryInterfaces();
    }
    return true;
}

IGraphBuilder * CDXGraph::GetGraph(void)
{
    return mGraph;
}

IMediaEventEx * CDXGraph::GetEventHandle(void)
{
    return mEvent;
}

// Connect filter from the upstream output pin to the downstream input pin
bool CDXGraph::ConnectFilters(IPin * inOutputPin, IPin * inInputPin,
                              const AM_MEDIA_TYPE * inMediaType)
{
    if (mGraph && inOutputPin && inInputPin)
    {
        HRESULT hr = mGraph->ConnectDirect(inOutputPin, inInputPin, inMediaType);
        return SUCCEEDED(hr) ? true : false;
    }
    return false;
}

void CDXGraph::DisconnectFilters(IPin * inOutputPin)
{
    if (mGraph && inOutputPin)
    {
        HRESULT hr = mGraph->Disconnect(inOutputPin);
    }
}

bool CDXGraph::SetDisplayWindow(HWND inWindow)
{   
    if (mVideoWindow)
    {
    //    long lVisible;
    //    mVideoWindow->get_Visible(&lVisible);
        // Hide the video window first
        mVideoWindow->put_Visible(OAFALSE);
        mVideoWindow->put_Owner((OAHWND)inWindow);

        RECT windowRect;
        ::GetClientRect(inWindow, &windowRect);
        mVideoWindow->put_Left(0);
        mVideoWindow->put_Top(0);
        mVideoWindow->put_Width(windowRect.right - windowRect.left);
        mVideoWindow->put_Height(windowRect.bottom - windowRect.top);
        mVideoWindow->put_WindowStyle(WS_CHILD|WS_CLIPCHILDREN|WS_CLIPSIBLINGS);

        mVideoWindow->put_MessageDrain((OAHWND) inWindow);
        // Restore the video window
        if (inWindow != NULL)
        {
        //    mVideoWindow->put_Visible(lVisible);
            mVideoWindow->put_Visible(OATRUE);
        }
        else
        {
            mVideoWindow->put_Visible(OAFALSE);
        }
        return true;
    }
    return false;
}

bool CDXGraph::ResizeVideoWindow(long inLeft, long inTop, long inWidth, long inHeight)
{
    if (mVideoWindow)
    {
        long lVisible = OATRUE;
        mVideoWindow->get_Visible(&lVisible);
        // Hide the video window first
        mVideoWindow->put_Visible(OAFALSE);

        mVideoWindow->put_Left(inLeft);
        mVideoWindow->put_Top(inTop);
        mVideoWindow->put_Width(inWidth);
        mVideoWindow->put_Height(inHeight);
   
        // Restore the video window
        mVideoWindow->put_Visible(lVisible);
        return true;
    }
    return false;
}

bool CDXGraph::SetNotifyWindow(HWND inWindow)
{
    if (mEvent)
    {
        mEvent->SetNotifyWindow((OAHWND)inWindow, WM_GRAPHNOTIFY, 0);
        return true;
    }
    return false;
}

void CDXGraph::HandleEvent(WPARAM inWParam, LPARAM inLParam)
{
    if (mEvent)
    {
        LONG eventCode = 0, eventParam1 = 0, eventParam2 = 0;
        while (SUCCEEDED(mEvent->GetEvent(&eventCode, &eventParam1, &eventParam2, 0)))
        {
            mEvent->FreeEventParams(eventCode, eventParam1, eventParam2);
            switch (eventCode)
            {
            case EC_COMPLETE:
                break;

            case EC_USERABORT:
            case EC_ERRORABORT:
                break;

            default:
                break;
            }
        }
    }
}

bool CDXGraph::Run(void)
{
    if (mGraph && mMediaControl)
    {
        if (!IsRunning())
        {
            if (SUCCEEDED(mMediaControl->Run()))
            {
                return true;
            }
        }
        else
        {
            return true;
        }
    }
    return false;
}

bool CDXGraph::Stop(void)
{
    if (mGraph && mMediaControl)
    {
        if (!IsStopped())
        {   
            if (SUCCEEDED(mMediaControl->Stop()))
            {
                return true;
            }
        }
        else
        {
            return true;
        }
    }
    return false;
}

bool CDXGraph::Pause(void)
{
    if (mGraph && mMediaControl)
    {
        if (!IsPaused())
        {   
            if (SUCCEEDED(mMediaControl->Pause()))
            {
                return true;
            }
        }
        else
        {
            return true;
        }
    }
    return false;
}

bool CDXGraph::IsRunning(void)
{
    if (mGraph && mMediaControl)
    {
        OAFilterState state = State_Stopped;
        if (SUCCEEDED(mMediaControl->GetState(10, &state)))
        {
            return state == State_Running;
        }
    }
    return false;
}

bool CDXGraph::IsStopped(void)
{
    if (mGraph && mMediaControl)
    {
        OAFilterState state = State_Stopped;
        if (SUCCEEDED(mMediaControl->GetState(10, &state)))
        {
            return state == State_Stopped;
        }
    }
    return false;
}

bool CDXGraph::IsPaused(void)
{
    if (mGraph && mMediaControl)
    {
        OAFilterState state = State_Stopped;
        if (SUCCEEDED(mMediaControl->GetState(10, &state)))
        {
            return state == State_Paused;
        }
    }
    return false;
}

bool CDXGraph::SetFullScreen(BOOL inEnabled)
{
    if (mVideoWindow)
    {
        HRESULT hr = mVideoWindow->put_FullScreenMode(inEnabled ? OATRUE : OAFALSE);
        return SUCCEEDED(hr);
    }
    return false;
}

bool CDXGraph::GetFullScreen(void)
{
    if (mVideoWindow)
    {
        long  fullScreenMode = OAFALSE;
        mVideoWindow->get_FullScreenMode(&fullScreenMode);
        return (fullScreenMode == OATRUE);
    }
    return false;
}

// IMediaSeeking features
bool CDXGraph::GetCurrentPosition(double * outPosition)
{
    if (mSeeking)
    {
        __int64 position = 0;
        if (SUCCEEDED(mSeeking->GetCurrentPosition(&position)))
        {
            *outPosition = ((double)position) / 10000000.;
            return true;
        }
    }
    return false;
}

bool CDXGraph::GetStopPosition(double * outPosition)
{
    if (mSeeking)
    {
        __int64 position = 0;
        if (SUCCEEDED(mSeeking->GetStopPosition(&position)))
        {
            *outPosition = ((double)position) / 10000000.;
            return true;
        }
    }
    return false;
}

bool CDXGraph::SetCurrentPosition(double inPosition)
{
    if (mSeeking)
    {
        __int64 one = 10000000;
        __int64 position = (__int64)(one * inPosition);
        HRESULT hr = mSeeking->SetPositions(&position, AM_SEEKING_AbsolutePositioning | AM_SEEKING_SeekToKeyFrame,
            0, AM_SEEKING_NoPositioning);
        return SUCCEEDED(hr);
    }
    return false;
}

bool CDXGraph::SetStartStopPosition(double inStart, double inStop)
{
    if (mSeeking)
    {
        __int64 one = 10000000;
        __int64 startPos = (__int64)(one * inStart);
        __int64 stopPos  = (__int64)(one * inStop);
        HRESULT hr = mSeeking->SetPositions(&startPos, AM_SEEKING_AbsolutePositioning | AM_SEEKING_SeekToKeyFrame,
            &stopPos, AM_SEEKING_AbsolutePositioning | AM_SEEKING_SeekToKeyFrame);
        return SUCCEEDED(hr);
    }
    return false;
}

bool CDXGraph::GetDuration(double * outDuration)
{
    if (mSeeking)
    {
        __int64 length = 0;
        if (SUCCEEDED(mSeeking->GetDuration(&length)))
        {
            *outDuration = ((double)length) / 10000000.;
            return true;
        }
    }
    return false;
}

bool CDXGraph::SetPlaybackRate(double inRate)
{
    if (mSeeking)
    {
        if (SUCCEEDED(mSeeking->SetRate(inRate)))
        {
            return true;
        }
    }
    return false;
}

// Attention: range from -10000 to 0, and 0 is FULL_VOLUME.
bool CDXGraph::SetAudioVolume(long inVolume)
{
    if (mBasicAudio)
    {
        HRESULT hr = mBasicAudio->put_Volume(inVolume);
        return SUCCEEDED(hr);
    }
    return false;
}

long CDXGraph::GetAudioVolume(void)
{
    long volume = 0;
    if (mBasicAudio)
    {
        mBasicAudio->get_Volume(&volume);
    }
    return volume;
}

// Attention: range from -10000(left) to 10000(right), and 0 is both.
bool CDXGraph::SetAudioBalance(long inBalance)
{
    if (mBasicAudio)
    {
        HRESULT hr = mBasicAudio->put_Balance(inBalance);
        return SUCCEEDED(hr);
    }
    return false;
}

long CDXGraph::GetAudioBalance(void)
{
    long balance = 0;
    if (mBasicAudio)
    {
        mBasicAudio->get_Balance(&balance);
    }
    return balance;
}

bool CDXGraph::RenderFile(const char * inFile)
{
    if (mGraph)
    {
        WCHAR    szFilePath[MAX_PATH];
        MultiByteToWideChar(CP_ACP, 0, inFile, -1, szFilePath, MAX_PATH);
        if (SUCCEEDED(mGraph->RenderFile(szFilePath, NULL)))
        {
            return true;
        }
    }
    return false;
}

bool CDXGraph::SnapshotBitmap(const char * outFile)
{
    if (mBasicVideo)
    {
        long bitmapSize = 0;
        if (SUCCEEDED(mBasicVideo->GetCurrentImage(&bitmapSize, 0)))
        {
            bool pass = false;
            unsigned char * buffer = new unsigned char[bitmapSize];
            if (SUCCEEDED(mBasicVideo->GetCurrentImage(&bitmapSize, (long *)buffer)))
            {
                BITMAPFILEHEADER    hdr;
                LPBITMAPINFOHEADER    lpbi;

                lpbi = (LPBITMAPINFOHEADER)buffer;

                int nColors = 1 << lpbi->biBitCount;
                if (nColors > 256)
                    nColors = 0;

                hdr.bfType        = ((WORD) ('M' << 8) | 'B');    //always is "BM"
                hdr.bfSize        = bitmapSize + sizeof( hdr );
                hdr.bfReserved1     = 0;
                hdr.bfReserved2     = 0;
                hdr.bfOffBits        = (DWORD) (sizeof(BITMAPFILEHEADER) + lpbi->biSize +
                        nColors * sizeof(RGBQUAD));

                CFile bitmapFile(outFile, CFile::modeReadWrite | CFile::modeCreate | CFile::typeBinary);
                bitmapFile.Write(&hdr, sizeof(BITMAPFILEHEADER));
                bitmapFile.Write(buffer, bitmapSize);
                bitmapFile.Close();
                pass = true;
            }
            delete [] buffer;
            return pass;
        }
    }
    return false;
}


//////////////////////// For GraphEdit Dubug purpose /////////////////////////////
void CDXGraph::AddToObjectTable(void)
{
    IMoniker * pMoniker = 0;
    IRunningObjectTable * objectTable = 0;
    if (SUCCEEDED(GetRunningObjectTable(0, &objectTable)))
    {
        WCHAR wsz[256];
        wsprintfW(wsz, L"FilterGraph %08p pid %08x", (DWORD_PTR)mGraph, GetCurrentProcessId());
        HRESULT hr = CreateItemMoniker(L"!", wsz, &pMoniker);
        if (SUCCEEDED(hr))
        {
            hr = objectTable->Register(0, mGraph, pMoniker, &mObjectTableEntry);
            pMoniker->Release();
        }
        objectTable->Release();
    }
}

void CDXGraph::RemoveFromObjectTable(void)
{
    IRunningObjectTable * objectTable = 0;
    if (SUCCEEDED(GetRunningObjectTable(0, &objectTable)))
    {
        objectTable->Revoke(mObjectTableEntry);
        objectTable->Release();
        mObjectTableEntry = 0;
    }
}


使用例子
void CMpegImageDlg::OnOpenButton()
{
    // TODO: Add your control notification handler code here
    CString strFilter =
    "MPEG File (*.mpg;*.mpeg)|*.mpg;*.mpeg|"
    "AVI File (*.avi)|*.avi|"
    "Mp3 File (*.mp3)|*.mp3|"
    "Wave File (*.wav)|*.wav|"
    "All Files (*.*)|*.*|";
    CFileDialog dlgOpen(TRUE, NULL, NULL, OFN_PATHMUSTEXIST | OFN_HIDEREADONLY,
        strFilter, this);
    if (IDOK == dlgOpen.DoModal())
    {
        CString strSourceFile = dlgOpen.GetPathName();
        // Rebuild the file playback filter graph
        CMpegImageDlg::CreateGraph(strSourceFile);
        GetDlgItem(ID_OPEN_BUTTON)->EnableWindow(FALSE);
        GetDlgItem(ID_PLAY_BUTTON)->EnableWindow(TRUE);
    }   
}


void CMpegImageDlg::CreateGraph(const CString& strSourceFile)
{
    CMpegImageDlg::DestroyGraph();
   
    m_FilterGraph = new CDXGraph();
    if (m_FilterGraph->Create())
    {
        // Render the source clip
        m_FilterGraph->RenderFile(strSourceFile);
        // Set video window and notification window
        m_FilterGraph->SetDisplayWindow(m_VideoWindow.GetSafeHwnd());
        m_FilterGraph->SetNotifyWindow(this->GetSafeHwnd());
        // Show the first frame
        m_FilterGraph->Pause();
    }
}


void CMpegImageDlg::DestroyGraph(void)
{
    if(m_FilterGraph)
    {
        // Stop the filter graph first
        m_FilterGraph->Stop();
        m_FilterGraph->SetNotifyWindow(NULL);
       
        delete m_FilterGraph;
        m_FilterGraph = NULL;
    }
}

void CMpegImageDlg::OnPlayButton()
{
    // TODO: Add your control notification handler code here
    if (m_FilterGraph)
    {
        GetDlgItem(ID_PLAY_BUTTON)->EnableWindow(FALSE);
        GetDlgItem(ID_IMAGE_BUTTON)->EnableWindow(TRUE);
        m_FilterGraph->Run();
        // Start a timer
        if (m_SliderTimer == 0)
        {
            m_SliderTimer = SetTimer(SLIDER_TIMER, 100, NULL);
        }
    }   
}