转载请标明是引用于 http://blog.csdn.net/chenyujing1234

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须要演示样例源代码的请独自联系我.

前提： 摄像头能正常工作、摄像头有创建directshow filter

即

大家能够对照我的还有一篇文章学习：    wince系统下DirectShow採集摄像头

一、初始化工作

1、DirctShow环境初始化
bool

uEye_DirectShow_Demo_Dlg::DirectShow_Init()

{

    // initialize the COM library on the current thread

    HRESULT err= CoInitialize(NULL);

    if( FAILED(err))

    {

        MessageBoxEx( NULL, "Initializing COM library failed!", __FUNCTION__, MB_ICONERROR, 0);

    }

    return err == S_OK;

}
2、搜索Video源

假设没有设备接入，那么CreateClassEnumerator会返回失败

bool

uEye_DirectShow_Demo_Dlg::VideoSourcesList_Fill()

{

    HRESULT status= S_OK;

    // create System Device Enumerator

    ICreateDevEnum *pSystemDeviceEnumerator= NULL;

    status= CoCreateInstance(  CLSID_SystemDeviceEnum,

                                NULL,

                                CLSCTX_INPROC,

                                IID_ICreateDevEnum,

                                (void**)&pSystemDeviceEnumerator);

    if( FAILED(status))

    {

        MessageBoxEx( NULL, "Creating System Device Enumerator failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    // create Class Enumerator that lists alls video input devices among the system devices

    IEnumMoniker *pVideoInputDeviceEnumerator= NULL;

    status= pSystemDeviceEnumerator->CreateClassEnumerator( CLSID_VideoInputDeviceCategory,

                                                            &pVideoInputDeviceEnumerator,

                                                            0);

    // release the System Device Enumerator which is not needed anymore

    pSystemDeviceEnumerator->Release();

    pSystemDeviceEnumerator= NULL;

    if( status != S_OK)

    {

        MessageBoxEx( NULL, "Creating Class Enumerator failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    // add entry '[no device selected]' to list

    m_comboVideoSources.AddString( "[no device selected]");

    m_comboVideoSources.SetItemDataPtr( 0, NULL);

    // for each enumerated video input device: add it to the list

    IMoniker *pMoniker= NULL;

    while( pVideoInputDeviceEnumerator->Next( 1, &pMoniker, NULL) == S_OK )

    {

        VARIANT var;

        VariantInit(&var);

        // make filters properties accessible

        IPropertyBag *pPropBag= NULL;

        status= pMoniker->BindToStorage( 0, 0, IID_IPropertyBag, (void**)&pPropBag);

        if( FAILED(status))

        {

            pPropBag= NULL;

            MessageBoxEx( NULL, "Accessing filter properties failed!", __FUNCTION__, MB_ICONERROR, 0);

            // continue with the next filter

        }

        else

        {

            // add a reference to the storage object

            pPropBag->AddRef();

            // get the name of this filter

            status= pPropBag->Read( L"FriendlyName", &var, 0);

            if( FAILED(status))

            {

                MessageBoxEx( NULL, "Reading filter name failed!", __FUNCTION__, MB_ICONERROR, 0);

                // continue with the next filter

            }

            else

            {

                // if uEye Capture Device:

                // add filtername to the list and link the moniker pointer to the list entry

                CString sTemp(var.bstrVal);

#if (0) /* jma [04/08/2010] add devices named UI... too */

                if( sTemp.Find( "uEye Capture Device", 0) != -1)

#endif

                if ((sTemp.Find( "uEye Capture Device", 0) != -1) || (sTemp.Find( "UI", 0) != -1))

                {

                    int index = m_comboVideoSources.AddString( sTemp);

                    // dont forget to release the moniker later!

                    m_comboVideoSources.SetItemDataPtr( index, pMoniker);

                }

                else

                {

                    pMoniker->Release();

                    pMoniker= NULL;

                }

            }

            // release the reference to the storage object

            pPropBag->Release();

            pPropBag= NULL;

        }

        VariantClear(&var);

    }

    // release the class enumerator

    pVideoInputDeviceEnumerator->Release();

    pVideoInputDeviceEnumerator= NULL;

    // select first list entry

    m_comboVideoSources.SetCurSel( 0);

    return false;

}

二、选择某个摄像设备

1、先停止原有的Media
bool

uEye_DirectShow_Demo_Dlg::FilterGraph_Stop()

{

    Invalidate();

    // proceed only if filter graph manager object present

    if( m_pActiveFilterGraphManager == NULL)

    {

        return true;

    }

    HRESULT status= S_OK;

    // get the MediaControl interface of the graph

    IMediaControl* pMediaControl= NULL;

    status= m_pActiveFilterGraphManager->QueryInterface( IID_IMediaControl, (void**)&pMediaControl);

    if( FAILED(status) || pMediaControl == NULL)

    {

        MessageBoxEx( NULL, "Querying MediaControl interface of the filter graph manager failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    //// check for graph to be executing before allowing to stop

    //OAFilterState filterState= 0;   // OAFilterState is actually a long

    //status= pMediaControl->GetState( 100, &filterState);

    //if( FAILED(status))

    //{

    //    // cleanup

    //    // release the MediaControl interface object

    //    pMediaControl->Release();

    //    pMediaControl= NULL;

    //    MessageBoxEx( NULL, "Querying graph state failed!", __FUNCTION__, MB_ICONERROR, 0);

    //    return false;

    //}

    //if( filterState != State_Stopped)

    {

        // stop the execution of the graph

        status= pMediaControl->Stop();

        if( FAILED(status))

        {

            // cleanup

            // release the MediaControl interface object

            pMediaControl->Release();

            pMediaControl= NULL;

            MessageBoxEx( NULL, "Stopping the graph failed!", __FUNCTION__, MB_ICONERROR, 0);

            return false;

        }

        // update the graph state view

        UpdateGraphState( State_Stopped);

    }

    // release the MediaControl interface object

    pMediaControl->Release();

    pMediaControl= NULL;

    return true;

}
2、删除Graph
bool

uEye_DirectShow_Demo_Dlg::FilterGraph_Destroy()

{

    // proceed only if filter graph manager object present

    if( m_pActiveFilterGraphManager == NULL)

    {

        return true;

    }

    if( !FilterGraph_Stop())

    {

        return false;

    }

    // disable 'dump graph' button as long as no graph present

    m_bnDumpGraph.EnableWindow( FALSE);

    // delete the capture filter

    m_pActiveVideoSource->Release();

    m_pActiveVideoSource= NULL;

    // delete the graph

    m_pActiveFilterGraphManager->Release();

    m_pActiveFilterGraphManager= NULL;

    // update the graph state view

    UpdateGraphState( -1);

    return true;

}
3、依据选择的设备的moniker来创建Graph

分为:

(1)为选择的设备创建capture filter

status= pMoniker->BindToObject( 0, 0, IID_IBaseFilter, (void**)&m_pActiveVideoSource);

(2) 创建一个capture Graph Builder对象

ICaptureGraphBuilder2* pCaptureGraphBuilder= NULL;

    status= CoCreateInstance(   CLSID_CaptureGraphBuilder2,

                                NULL,

                                CLSCTX_INPROC,

                                IID_ICaptureGraphBuilder2,

                                (void**)&pCaptureGraphBuilder);

(3) 创建 Filter Graph Manager

// create the Filter Graph Manager

    status= CoCreateInstance(   CLSID_FilterGraph,

                                NULL,

                                CLSCTX_INPROC,

                                IID_IGraphBuilder,

                                (void **)&m_pActiveFilterGraphManager);

(4) 初始化Capture Graph Builder 对象，把graph和builder 连接起来

status= pCaptureGraphBuilder->SetFiltergraph( m_pActiveFilterGraphManager);

(5) 添加Capture到graph中

status= m_pActiveFilterGraphManager->AddFilter( m_pActiveVideoSource, L"Video Capture");

(6) render 视频的capture pin， 把caputre filter和render连接起来

status= pCaptureGraphBuilder->RenderStream( &PIN_CATEGORY_CAPTURE,

                                                &MEDIATYPE_Video,

                                                m_pActiveVideoSource,

                                                NULL,

                                                NULL);

(7) 查询filter graph manager的VideoWindow接口

IVideoWindow* pVideoWindow= NULL;

    status= m_pActiveFilterGraphManager->QueryInterface( IID_IVideoWindow, (void**)&pVideoWindow);

(8) 把video view连接到graph

// connect the dialogs video view to the graph

    CWnd* pwnd= GetDlgItem( IDC_STATIC_VIDEOVIEW);

    pVideoWindow->put_Owner( (OAHWND)pwnd->m_hWnd);  // put_Owner always returns NOERROR

// we dont want a title bar on our video view

    long pWindowStyle = 0;

    pVideoWindow->get_WindowStyle(&pWindowStyle);

    pWindowStyle &= ~WS_CAPTION;

    pVideoWindow->put_WindowStyle(pWindowStyle);

// adjust graphs video geometry

    CRect rc( 0, 0, 0, 0);

    pwnd->GetClientRect( &rc);

    pVideoWindow->SetWindowPosition( rc.left, rc.top, rc.Width(), rc.Height());

// release the VideoWindow interface object, we do not need it anymore

    pVideoWindow->Release();

四、  開始播放

bool

uEye_DirectShow_Demo_Dlg::FilterGraph_Start()

{

    // proceed only if filter graph manager object present

    if( m_pActiveFilterGraphManager == NULL)

    {

        return true;

    }

    HRESULT status= S_OK;

    // get the MediaControl interface of the graph

    IMediaControl* pMediaControl= NULL;

    status= m_pActiveFilterGraphManager->QueryInterface( IID_IMediaControl, (void**)&pMediaControl);

    if( FAILED(status) || pMediaControl == NULL)

    {

        MessageBoxEx( NULL, "Querying MediaControl interface of the filter graph manager failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    //// check for graph to be stopped before allowing to start

    //OAFilterState filterState= 0;   // OAFilterState is actually a long

    //status= pMediaControl->GetState( 100, &filterState);

    //if( FAILED(status))

    //{

    //    // cleanup

    //    // release the MediaControl interface object

    //    pMediaControl->Release();

    //    pMediaControl= NULL;

    //    MessageBoxEx( NULL, "Querying graph state failed!", __FUNCTION__, MB_ICONERROR, 0);

    //    return false;

    //}

    //if( filterState == State_Stopped)

    {

        // start the execution of the graph

        status= pMediaControl->Run();

        if( FAILED(status))

        {

            // cleanup

            // release the MediaControl interface object

            pMediaControl->Release();

            pMediaControl= NULL;

            MessageBoxEx( NULL, "Starting the graph failed!", __FUNCTION__, MB_ICONERROR, 0);

            return false;

        }

        // update the graph state view

        UpdateGraphState( State_Running);

    }

    // release the MediaControl interface object

    pMediaControl->Release();

    pMediaControl= NULL;

    return true;

}

五、 pin 特征的查看

假设pin里有自己的查看特征接口, 那么就直接调用接口

bool

uEye_DirectShow_Demo_Dlg::ShowPinProperties()

{

    // proceed only if video source object present

    if( m_pActiveVideoSource == NULL)

    {

        return true;

    }

    HRESULT status= S_OK;

    IPin* pPin= GetPin( m_pActiveVideoSource, PINDIR_OUTPUT, &MEDIATYPE_Video, &PIN_CATEGORY_CAPTURE);

    if( pPin == NULL)

    {

        MessageBoxEx( NULL, "Pin not available!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    IUnknown* pFilterUnk= NULL;

    status= pPin->QueryInterface( IID_IUnknown, (void**)&pFilterUnk);

    if( FAILED(status))

    {

        // cleanup

        pPin->Release();

        pPin= NULL;

        MessageBoxEx( NULL, "Querying pin's IAMStreamConfig interface failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    ISpecifyPropertyPages* pSpecifyPropertyPages= NULL;

    status= pFilterUnk->QueryInterface( IID_ISpecifyPropertyPages, (void**)&pSpecifyPropertyPages);

    if( FAILED(status))

    {

        // cleanup

        pFilterUnk->Release();

        pFilterUnk= NULL;

        pPin->Release();

        pPin= NULL;

        MessageBoxEx( NULL, "Querying pin's ISpecifyPropertyPages interface failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    CAUUID cauuid= { 0, NULL};

    status= pSpecifyPropertyPages->GetPages( &cauuid);

    if( FAILED(status))

    {

        // cleanup

        pSpecifyPropertyPages->Release();

        pSpecifyPropertyPages->Release();

        pSpecifyPropertyPages= NULL;

        pFilterUnk->Release();

        pFilterUnk= NULL;

        pPin->Release();

        pPin= NULL;

        MessageBoxEx( NULL, "Querying pin's ISpecifyPropertyPages interface failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    pSpecifyPropertyPages->Release();

    pSpecifyPropertyPages->Release();

    pSpecifyPropertyPages= NULL;

    status= OleCreatePropertyFrame( GetSafeHwnd(),//*this,

                                    0,

                                    0,

                                    OLESTR("uEye Capture Device Pin"),

                                    1,

                                    (IUnknown**)&pFilterUnk,

                                    cauuid.cElems,

                                    (GUID*)cauuid.pElems,

                                    0,

                                    0,

                                    NULL);

    if( FAILED(status))

    {

        // cleanup

        CoTaskMemFree( cauuid.pElems);

        cauuid.pElems= NULL;

        cauuid.cElems= 0;

        pFilterUnk->Release();

        pFilterUnk= NULL;

        pPin->Release();

        pPin= NULL;

        MessageBoxEx( NULL, "OleCreatePropertyFrame failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    // cleanup

    CoTaskMemFree( cauuid.pElems);

    cauuid.pElems= NULL;

    cauuid.cElems= 0;

    pFilterUnk->Release();

    pFilterUnk= NULL;

    pPin->Release();

    pPin= NULL;

    return true;

}

六、 查询包括的 filter信息

bool

uEye_DirectShow_Demo_Dlg::EnumerateFilters()

{

    // proceed only if filter graph builder object present

    if( m_pActiveFilterGraphManager == NULL)

    {

        return false;

    }

    IEnumFilters *pEnum = NULL;

    IBaseFilter *pFilter;

    ULONG cFetched;

    HRESULT hr = m_pActiveFilterGraphManager->EnumFilters(&pEnum);

    if (FAILED(hr))

    {

        MessageBoxEx( NULL, "Enumerating filters failed!", __FUNCTION__, MB_ICONERROR, 0);

        return false;

    }

    CString sInfo( "Filters in the Graph:\n\n");

    int i= 0;

    while(pEnum->Next(1, &pFilter, &cFetched) == S_OK)

    {

        i++;

        FILTER_INFO FilterInfo;

        hr = pFilter->QueryFilterInfo(&FilterInfo);

        if (FAILED(hr))

        {

            MessageBoxEx( NULL, "Could not get the filter info", __FUNCTION__, MB_ICONERROR, 0);

            continue;  // Maybe the next one will work.

        }

        LPWSTR pVendorInfo= NULL;

        hr= pFilter->QueryVendorInfo( &pVendorInfo);

        if( FAILED(hr))

        {

            pVendorInfo= NULL;

        }

        if( pVendorInfo != NULL)

        {

            sInfo.AppendFormat( "%d: %S (by %S)\n", i, FilterInfo.achName, pVendorInfo);

            CoTaskMemFree( pVendorInfo);

            pVendorInfo= NULL;

        }

        else

        {

            sInfo.AppendFormat( "%d: %S\n", i, FilterInfo.achName);

        }

        // The FILTER_INFO structure holds a pointer to the Filter Graph

        // Manager, with a reference count that must be released.

        if (FilterInfo.pGraph != NULL)

        {

            FilterInfo.pGraph->Release();

        }

        pFilter->Release();

    }

    pEnum->Release();

    MessageBoxEx( NULL, sInfo.GetBuffer(), __FUNCTION__, MB_OK, 0);

    return true;

}

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