Visual C 编程实现摄像头视频捕捉

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　　DirectShow是微软公司提供的一套在Windows平台上进行流媒体处理的开发包，与DirectX开发包一起发布。DirectShow为多媒体流的捕捉和回放提供了强有力的支持。用DirectShow开发应用程序，我们可以很方便地从支持WDM驱动模型的采集卡上捕获数据，并且进行相应的后期处理乃至存储到文件中。　　DirectShow是基于COM的，为了编写DirectShow应用程序，需要了解COM客户程序编写的基础知识。DirectShow提供了大量的接口，但在编程中发现还是不够方便，如果能构建一个视频捕捉类把常用的一些动作封装起来，那么就更方便了。　　编程思路　　为了更加容易建立视频捕捉应用程序，DirectShow提供了一个叫做Capture Graph Builder的对象，Capture Graph Builder提供IcaptureGraphBuilder2接口，该接口可以建立和控制Capture Graph。　　建立视频捕捉程序，必须首先获取并初始化IcaptureGraphBuilder2接口，然后选择一个适当的视频捕捉设备。选择好设备后，为该设备创建Capture filter，然后调用AddFilter把Capture filter添加到Filter Graph。　　如果仅仅希望用摄像头来进行实时监控的话，只需要在上面的基础上调用ICaptureGraphBuilder2::RenderStream就可以了： ICaptureGraphBuilder2 *pBuild; // Capture Graph Builder//省略初始化部分代码IBaseFilter *pCap; // Video capture filter.//省略初始化和添加到Filter Graph部分代码pBuild->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, pCap, NULL, NULL);　　DirectShow提供了一个捕捉静态图像的方法：使用Sample Grabber filter。依次按照以下三个步骤就可以了：　　第一步, 定义一个类实现Sample Grabber的回调接口IsampleGrabberCB： class CSampleGrabberCB : public ISampleGrabberCB{ 　//在后面提供的类中具体完成}CSampleGrabberCB mCB;　　第二步、调用RenderStream依次把Still pin、Sample Grabber和系统默认Renderer Filter连接起来。　　第三步、配置Sample Grabber以捕获数据。　　视频捕捉类CCaptureVideo的具体实现 // CCaptureVideo视频捕捉类头文件/////////////////////////////////////////////////////////////////////#if !defined(AFX_CAPTUREVIDEO_H__F5345AA4_A39F_4B07_B843_3D87C4287AA0__INCLUDED_)#define AFX_CAPTUREVIDEO_H__F5345AA4_A39F_4B07_B843_3D87C4287AA0__INCLUDED_/////////////////////////////////////////////////////////////////////// CaptureVideo.h : header file/////////////////////////////////////////////////////////////////////#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000#include #include #include #ifndef SAFE_RELEASE#define SAFE_RELEASE( x ) \if ( NULL != x ) \{ \　x->Release( ); \　x = NULL; \}#endifclass CSampleGrabberCB;class CCaptureVideo : public CWnd {　friend class CSampleGrabberCB;　public:　　void GrabOneFrame(BOOL bGrab);　　HRESULT Init(int iDeviceID,HWND hWnd);　　int EnumDevices(HWND hList);　　CCaptureVideo();　　virtual ~CCaptureVideo();　private:　　HWND m_hWnd;　　IGraphBuilder *m_pGB;　　ICaptureGraphBuilder2* m_pCapture;　　IBaseFilter* m_pBF;　　IMediaControl* m_pMC;　　IVideoWindow* m_pVW;　　CComPtr m_pGrabber;　protected:　　void FreeMediaType(AM_MEDIA_TYPE& mt);　　bool BindFilter(int deviceId, IBaseFilter **pFilter);　　void ResizeVideoWindow();　　HRESULT SetupVideoWindow();　　HRESULT InitCaptureGraphBuilder();};#endif // !defined(AFX_CAPTUREVIDEO_H__F5345AA4_A39F_4B07_B843_3D87C4287AA0__INCLUDED_)//-------------------------------------------------------------------// CCaptureVideo视频捕捉类实现文件CaptureVideo.cpp//-------------------------------------------------------------------// CaptureVideo.cpp: implementation of the CCaptureVideo class.///////////////////////////////////////////////////////////////////////#include "stdafx.h"#include "CaptureVideo.h"#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE[]=__FILE__;#define new DEBUG_NEW#endifBOOL bOneShot=FALSE;//全局变量class CSampleGrabberCB : public ISampleGrabberCB {　public:　　long lWidth;　　long lHeight;　　TCHAR m_szFileName[MAX_PATH];// 位图文件名称　　CSampleGrabberCB( ){　　　strcpy(m_szFileName, "c:\\donaldo.bmp");　　} 　　STDMETHODIMP_(ULONG) AddRef() { return 2; }　　STDMETHODIMP_(ULONG) Release() { return 1; }　　STDMETHODIMP QueryInterface(REFIID riid, void ** ppv){　　if( riid == IID_ISampleGrabberCB || riid == IID_IUnknown ){ 　　　*ppv = (void *) static_cast ( this );　　　return NOERROR;　　} 　　return E_NOINTERFACE;　}　STDMETHODIMP SampleCB( double SampleTime, IMediaSample * pSample ){　return 0;}STDMETHODIMP BufferCB( double dblSampleTime, BYTE * pBuffer, long lBufferSize ){　if( !bOneShot )return 0;　　if (!pBuffer)return E_POINTER;　SaveBitmap(pBuffer, lBufferSize);　bOneShot = FALSE;　return 0;}//创建位图文件BOOL SaveBitmap(BYTE * pBuffer, long lBufferSize ){　HANDLE hf = CreateFile(　m_szFileName, GENERIC_WRITE, FILE_SHARE_READ, NULL,　CREATE_ALWAYS, NULL, NULL );　if( hf == INVALID_HANDLE_VALUE )return 0;　　// 写文件头 　　BITMAPFILEHEADER bfh;　　memset( &bfh, 0, sizeof( bfh ) );　　bfh.bfType = ’MB’;　　bfh.bfSize = sizeof( bfh ) lBufferSize sizeof( BITMAPINFOHEADER );　　bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) sizeof( BITMAPFILEHEADER );　　DWORD dwWritten = 0;　　WriteFile( hf, &bfh, sizeof( bfh ), &dwWritten, NULL );　　// 写位图格式　　BITMAPINFOHEADER bih;　　memset( &bih, 0, sizeof( bih ) );　　bih.biSize = sizeof( bih );　　bih.biWidth = lWidth;　　bih.biHeight = lHeight;　　bih.biPlanes = 1;　　bih.biBitCount = 24;　　WriteFile( hf, &bih, sizeof( bih ), &dwWritten, NULL );　　// 写位图数据　　WriteFile( hf, pBuffer, lBufferSize, &dwWritten, NULL );　　CloseHandle( hf );　　return 0;　}};CSampleGrabberCB mCB;//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CCaptureVideo::CCaptureVideo(){　//COM Library Intialization　if(FAILED(CoInitialize(NULL))) /*, COINIT_APARTMENTTHREADED)))*/　{　　AfxMessageBox("CoInitialize Failed!\r\n"); 　　return;　}　m_hWnd = NULL;　m_pVW = NULL;　m_pMC = NULL;　m_pGB = NULL;　m_pCapture = NULL; }CCaptureVideo::~CCaptureVideo(){　// Stop media playback　if(m_pMC)m_pMC->Stop();　if(m_pVW){　　m_pVW->put_Visible(OAFALSE);　　m_pVW->put_Owner(NULL);　}　SAFE_RELEASE(m_pCapture);　SAFE_RELEASE(m_pMC);　SAFE_RELEASE(m_pGB);　SAFE_RELEASE(m_pBF);　CoUninitialize( );}int CCaptureVideo::EnumDevices(HWND hList){　if (!hList)　　return -1;　int id = 0;　//枚举视频扑捉设备　ICreateDevEnum *pCreateDevEnum;　HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,IID_ICreateDevEnum, (void**)&pCreateDevEnum);　if (hr != NOERROR)return -1;　CComPtr pEm;　hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pEm, 0);　if (hr != NOERROR)return -1;　pEm->Reset();　ULONG cFetched;　IMoniker *pM;　while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK)　{　　IPropertyBag *pBag;　　hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);　　if(SUCCEEDED(hr)) 　　{　　　VARIANT var;　　　var.vt = VT_BSTR;　　　hr = pBag->Read(L"FriendlyName", &var, NULL);　　　if (hr == NOERROR) 　　　{　　　　TCHAR str[2048]; 　　　　id ;　　　　WideCharToMultiByte(CP_ACP,0,var.bstrVal, -1, str, 2048, NULL, NULL);　　　　::SendMessage(hList, CB_ADDSTRING, 0,(LPARAM)str);　　　　SysFreeString(var.bstrVal);　　　}　　　pBag->Release();　　}　　pM->Release();　}　return id;}HRESULT CCaptureVideo::Init(int iDeviceID, HWND hWnd){　HRESULT hr;　hr = InitCaptureGraphBuilder();　if (FAILED(hr)){　　AfxMessageBox("Failed to get video interfaces!");　　return hr;　}　// Bind Device Filter. We know the device because the id was passed in　if(!BindFilter(iDeviceID, &m_pBF))return S_FALSE;　hr = m_pGB->AddFilter(m_pBF, L"Capture Filter");　// hr = m_pCapture->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, 　// m_pBF, NULL, NULL);　// create a sample grabber　hr = m_pGrabber.CoCreateInstance( CLSID_SampleGrabber );　if( !m_pGrabber ){　　AfxMessageBox("Fail to create SampleGrabber, maybe qedit.dll is not registered?");　　return hr;　}　CComQIPtr< IBaseFilter, &IID_IBaseFilter > pGrabBase( m_pGrabber );　//设置视频格式　AM_MEDIA_TYPE mt; 　ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));　mt.majortype = MEDIATYPE_Video;　mt.subtype = MEDIASUBTYPE_RGB24;　hr = m_pGrabber->SetMediaType(&mt);　if( FAILED( hr ) ){　　AfxMessageBox("Fail to set media type!");　　return hr;　}　hr = m_pGB->AddFilter( pGrabBase, L"Grabber" );　if( FAILED( hr ) ){　　AfxMessageBox("Fail to put sample grabber in graph");　　return hr;　}　// try to render preview/capture pin　hr = m_pCapture->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,m_pBF,pGrabBase,NULL);　if( FAILED( hr ) )　　hr = m_pCapture->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,m_pBF,pGrabBase,NULL);　　if( FAILED( hr ) ){　　　AfxMessageBox("Can’t build the graph");　　　return hr;　　}　　hr = m_pGrabber->GetConnectedMediaType( &mt );　if ( FAILED( hr) ){　　AfxMessageBox("Failt to read the connected media type");　　return hr;　}　VIDEOINFOHEADER * vih = (VIDEOINFOHEADER*) mt.pbFormat;　mCB.lWidth = vih->bmiHeader.biWidth;　mCB.lHeight = vih->bmiHeader.biHeight;　FreeMediaType(mt);　hr = m_pGrabber->SetBufferSamples( FALSE );　hr = m_pGrabber->SetOneShot( FALSE );　hr = m_pGrabber->SetCallback( &mCB, 1 );　//设置视频捕捉窗口　m_hWnd = hWnd ; 　SetupVideoWindow();　hr = m_pMC->Run();//开始视频捕捉　if(FAILED(hr)){AfxMessageBox("Couldn’t run the graph!");return hr;}　return S_OK;}bool CCaptureVideo::BindFilter(int deviceId, IBaseFilter **pFilter){　if (deviceId < 0)　return false;　// enumerate all video capture devices　CComPtr pCreateDevEnum;　HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,IID_ICreateDevEnum, (void**)&pCreateDevEnum);　if (hr != NOERROR)　{　　return false;　}　CComPtr pEm;　hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pEm, 0);　if (hr != NOERROR) 　{　　return false;　}　pEm->Reset();　ULONG cFetched;　IMoniker *pM;　int index = 0;　while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK, index <= deviceId)　{　　IPropertyBag *pBag;　　hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);　　if(SUCCEEDED(hr)) 　　{　　　VARIANT var;　　　var.vt = VT_BSTR;　　　hr = pBag->Read(L"FriendlyName", &var, NULL);　　　if (hr == NOERROR) 　　　{　　　　if (index == deviceId)　　　　{　　　　　pM->BindToObject(0, 0, IID_IBaseFilter, (void**)pFilter);　　　　}　　　　SysFreeString(var.bstrVal);　　　}　　　pBag->Release();　　}　　pM->Release();　　index ;　}　return true;}HRESULT CCaptureVideo::InitCaptureGraphBuilder(){　HRESULT hr;　// 创建IGraphBuilder接口　hr=CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&m_pGB);　// 创建ICaptureGraphBuilder2接口　hr = CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC,IID_ICaptureGraphBuilder2, (void **) &m_pCapture);　if (FAILED(hr))return hr;　m_pCapture->SetFiltergraph(m_pGB);　hr = m_pGB->QueryInterface(IID_IMediaControl, (void **)&m_pMC);　if (FAILED(hr))return hr;　hr = m_pGB->QueryInterface(IID_IVideoWindow, (LPVOID *) &m_pVW);　if (FAILED(hr))return hr;　return hr;}HRESULT CCaptureVideo::SetupVideoWindow(){　HRESULT hr;　hr = m_pVW->put_Owner((OAHWND)m_hWnd);　if (FAILED(hr))return hr;　hr = m_pVW->put_WindowStyle(WS_CHILD | WS_CLIPCHILDREN);　if (FAILED(hr))return hr;　ResizeVideoWindow();　hr = m_pVW->put_Visible(OATRUE);　return hr;}void CCaptureVideo::ResizeVideoWindow(){　if (m_pVW){　　//让图像充满整个窗口　　CRect rc;　　::GetClientRect(m_hWnd,&rc);　　m_pVW->SetWindowPosition(0, 0, rc.right, rc.bottom);　} }void CCaptureVideo::GrabOneFrame(BOOL bGrab){　bOneShot = bGrab;}void CCaptureVideo::FreeMediaType(AM_MEDIA_TYPE& mt){　if (mt.cbFormat != 0) {　　CoTaskMemFree((PVOID)mt.pbFormat);　　// Strictly unnecessary but tidier　　mt.cbFormat = 0;　　mt.pbFormat = NULL;　}　if (mt.pUnk != NULL) {　　mt.pUnk->Release();　　mt.pUnk = NULL;　}}共2页。 1 2 : 　　DirectShow是微软公司提供的一套在Windows平台上进行流媒体处理的开发包，与DirectX开发包一起发布。DirectShow为多媒体流的捕捉和回放提供了强有力的支持。用DirectShow开发应用程序，我们可以很方便地从支持WDM驱动模型的采集卡上捕获数据，并且进行相应的后期处理乃至存储到文件中。　　DirectShow是基于COM的，为了编写DirectShow应用程序，需要了解COM客户程序编写的基础知识。DirectShow提供了大量的接口，但在编程中发现还是不够方便，如果能构建一个视频捕捉类把常用的一些动作封装起来，那么就更方便了。　　编程思路　　为了更加容易建立视频捕捉应用程序，DirectShow提供了一个叫做Capture Graph Builder的对象，Capture Graph Builder提供IcaptureGraphBuilder2接口，该接口可以建立和控制Capture Graph。　　建立视频捕捉程序，必须首先获取并初始化IcaptureGraphBuilder2接口，然后选择一个适当的视频捕捉设备。选择好设备后，为该设备创建Capture filter，然后调用AddFilter把Capture filter添加到Filter Graph。　　如果仅仅希望用摄像头来进行实时监控的话，只需要在上面的基础上调用ICaptureGraphBuilder2::RenderStream就可以了： ICaptureGraphBuilder2 *pBuild; // Capture Graph Builder//省略初始化部分代码IBaseFilter *pCap; // Video capture filter.//省略初始化和添加到Filter Graph部分代码pBuild->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, pCap, NULL, NULL);　　DirectShow提供了一个捕捉静态图像的方法：使用Sample Grabber filter。依次按照以下三个步骤就可以了：　　第一步, 定义一个类实现Sample Grabber的回调接口IsampleGrabberCB： class CSampleGrabberCB : public ISampleGrabberCB{ 　//在后面提供的类中具体完成}CSampleGrabberCB mCB;　　第二步、调用RenderStream依次把Still pin、Sample Grabber和系统默认Renderer Filter连接起来。　　第三步、配置Sample Grabber以捕获数据。　　视频捕捉类CCaptureVideo的具体实现 // CCaptureVideo视频捕捉类头文件/////////////////////////////////////////////////////////////////////#if !defined(AFX_CAPTUREVIDEO_H__F5345AA4_A39F_4B07_B843_3D87C4287AA0__INCLUDED_)#define AFX_CAPTUREVIDEO_H__F5345AA4_A39F_4B07_B843_3D87C4287AA0__INCLUDED_/////////////////////////////////////////////////////////////////////// CaptureVideo.h : header file/////////////////////////////////////////////////////////////////////#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000#include #include #include #ifndef SAFE_RELEASE#define SAFE_RELEASE( x ) \if ( NULL != x ) \{ \　x->Release( ); \　x = NULL; \}#endifclass CSampleGrabberCB;class CCaptureVideo : public CWnd {　friend class CSampleGrabberCB;　public:　　void GrabOneFrame(BOOL bGrab);　　HRESULT Init(int iDeviceID,HWND hWnd);　　int EnumDevices(HWND hList);　　CCaptureVideo();　　virtual ~CCaptureVideo();　private:　　HWND m_hWnd;　　IGraphBuilder *m_pGB;　　ICaptureGraphBuilder2* m_pCapture;　　IBaseFilter* m_pBF;　　IMediaControl* m_pMC;　　IVideoWindow* m_pVW;　　CComPtr m_pGrabber;　protected:　　void FreeMediaType(AM_MEDIA_TYPE& mt);　　bool BindFilter(int deviceId, IBaseFilter **pFilter);　　void ResizeVideoWindow();　　HRESULT SetupVideoWindow();　　HRESULT InitCaptureGraphBuilder();};#endif // !defined(AFX_CAPTUREVIDEO_H__F5345AA4_A39F_4B07_B843_3D87C4287AA0__INCLUDED_)//-------------------------------------------------------------------// CCaptureVideo视频捕捉类实现文件CaptureVideo.cpp//-------------------------------------------------------------------// CaptureVideo.cpp: implementation of the CCaptureVideo class.///////////////////////////////////////////////////////////////////////#include "stdafx.h"#include "CaptureVideo.h"#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE[]=__FILE__;#define new DEBUG_NEW#endifBOOL bOneShot=FALSE;//全局变量class CSampleGrabberCB : public ISampleGrabberCB {　public:　　long lWidth;　　long lHeight;　　TCHAR m_szFileName[MAX_PATH];// 位图文件名称　　CSampleGrabberCB( ){　　　strcpy(m_szFileName, "c:\\donaldo.bmp");　　} 　　STDMETHODIMP_(ULONG) AddRef() { return 2; }　　STDMETHODIMP_(ULONG) Release() { return 1; }　　STDMETHODIMP QueryInterface(REFIID riid, void ** ppv){　　if( riid == IID_ISampleGrabberCB || riid == IID_IUnknown ){ 　　　*ppv = (void *) static_cast ( this );　　　return NOERROR;　　} 　　return E_NOINTERFACE;　}　STDMETHODIMP SampleCB( double SampleTime, IMediaSample * pSample ){　return 0;}STDMETHODIMP BufferCB( double dblSampleTime, BYTE * pBuffer, long lBufferSize ){　if( !bOneShot )return 0;　　if (!pBuffer)return E_POINTER;　SaveBitmap(pBuffer, lBufferSize);　bOneShot = FALSE;　return 0;}//创建位图文件BOOL SaveBitmap(BYTE * pBuffer, long lBufferSize ){　HANDLE hf = CreateFile(　m_szFileName, GENERIC_WRITE, FILE_SHARE_READ, NULL,　CREATE_ALWAYS, NULL, NULL );　if( hf == INVALID_HANDLE_VALUE )return 0;　　// 写文件头 　　BITMAPFILEHEADER bfh;　　memset( &bfh, 0, sizeof( bfh ) );　　bfh.bfType = ’MB’;　　bfh.bfSize = sizeof( bfh ) lBufferSize sizeof( BITMAPINFOHEADER );　　bfh.bfOffBits = sizeof( BITMAPINFOHEADER ) sizeof( BITMAPFILEHEADER );　　DWORD dwWritten = 0;　　WriteFile( hf, &bfh, sizeof( bfh ), &dwWritten, NULL );　　// 写位图格式　　BITMAPINFOHEADER bih;　　memset( &bih, 0, sizeof( bih ) );　　bih.biSize = sizeof( bih );　　bih.biWidth = lWidth;　　bih.biHeight = lHeight;　　bih.biPlanes = 1;　　bih.biBitCount = 24;　　WriteFile( hf, &bih, sizeof( bih ), &dwWritten, NULL );　　// 写位图数据　　WriteFile( hf, pBuffer, lBufferSize, &dwWritten, NULL );　　CloseHandle( hf );　　return 0;　}};CSampleGrabberCB mCB;//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CCaptureVideo::CCaptureVideo(){　//COM Library Intialization　if(FAILED(CoInitialize(NULL))) /*, COINIT_APARTMENTTHREADED)))*/　{　　AfxMessageBox("CoInitialize Failed!\r\n"); 　　return;　}　m_hWnd = NULL;　m_pVW = NULL;　m_pMC = NULL;　m_pGB = NULL;　m_pCapture = NULL; }CCaptureVideo::~CCaptureVideo(){　// Stop media playback　if(m_pMC)m_pMC->Stop();　if(m_pVW){　　m_pVW->put_Visible(OAFALSE);　　m_pVW->put_Owner(NULL);　}　SAFE_RELEASE(m_pCapture);　SAFE_RELEASE(m_pMC);　SAFE_RELEASE(m_pGB);　SAFE_RELEASE(m_pBF);　CoUninitialize( );}int CCaptureVideo::EnumDevices(HWND hList){　if (!hList)　　return -1;　int id = 0;　//枚举视频扑捉设备　ICreateDevEnum *pCreateDevEnum;　HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,IID_ICreateDevEnum, (void**)&pCreateDevEnum);　if (hr != NOERROR)return -1;　CComPtr pEm;　hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pEm, 0);　if (hr != NOERROR)return -1;　pEm->Reset();　ULONG cFetched;　IMoniker *pM;　while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK)　{　　IPropertyBag *pBag;　　hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);　　if(SUCCEEDED(hr)) 　　{　　　VARIANT var;　　　var.vt = VT_BSTR;　　　hr = pBag->Read(L"FriendlyName", &var, NULL);　　　if (hr == NOERROR) 　　　{　　　　TCHAR str[2048]; 　　　　id ;　　　　WideCharToMultiByte(CP_ACP,0,var.bstrVal, -1, str, 2048, NULL, NULL);　　　　::SendMessage(hList, CB_ADDSTRING, 0,(LPARAM)str);　　　　SysFreeString(var.bstrVal);　　　}　　　pBag->Release();　　}　　pM->Release();　}　return id;}HRESULT CCaptureVideo::Init(int iDeviceID, HWND hWnd){　HRESULT hr;　hr = InitCaptureGraphBuilder();　if (FAILED(hr)){　　AfxMessageBox("Failed to get video interfaces!");　　return hr;　}　// Bind Device Filter. We know the device because the id was passed in　if(!BindFilter(iDeviceID, &m_pBF))return S_FALSE;　hr = m_pGB->AddFilter(m_pBF, L"Capture Filter");　// hr = m_pCapture->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, 　// m_pBF, NULL, NULL);　// create a sample grabber　hr = m_pGrabber.CoCreateInstance( CLSID_SampleGrabber );　if( !m_pGrabber ){　　AfxMessageBox("Fail to create SampleGrabber, maybe qedit.dll is not registered?");　　return hr;　}　CComQIPtr< IBaseFilter, &IID_IBaseFilter > pGrabBase( m_pGrabber );　//设置视频格式　AM_MEDIA_TYPE mt; 　ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));　mt.majortype = MEDIATYPE_Video;　mt.subtype = MEDIASUBTYPE_RGB24;　hr = m_pGrabber->SetMediaType(&mt);　if( FAILED( hr ) ){　　AfxMessageBox("Fail to set media type!");　　return hr;　}　hr = m_pGB->AddFilter( pGrabBase, L"Grabber" );　if( FAILED( hr ) ){　　AfxMessageBox("Fail to put sample grabber in graph");　　return hr;　}　// try to render preview/capture pin　hr = m_pCapture->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video,m_pBF,pGrabBase,NULL);　if( FAILED( hr ) )　　hr = m_pCapture->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,m_pBF,pGrabBase,NULL);　　if( FAILED( hr ) ){　　　AfxMessageBox("Can’t build the graph");　　　return hr;　　}　　hr = m_pGrabber->GetConnectedMediaType( &mt );　if ( FAILED( hr) ){　　AfxMessageBox("Failt to read the connected media type");　　return hr;　}　VIDEOINFOHEADER * vih = (VIDEOINFOHEADER*) mt.pbFormat;　mCB.lWidth = vih->bmiHeader.biWidth;　mCB.lHeight = vih->bmiHeader.biHeight;　FreeMediaType(mt);　hr = m_pGrabber->SetBufferSamples( FALSE );　hr = m_pGrabber->SetOneShot( FALSE );　hr = m_pGrabber->SetCallback( &mCB, 1 );　//设置视频捕捉窗口　m_hWnd = hWnd ; 　SetupVideoWindow();　hr = m_pMC->Run();//开始视频捕捉　if(FAILED(hr)){AfxMessageBox("Couldn’t run the graph!");return hr;}　return S_OK;}bool CCaptureVideo::BindFilter(int deviceId, IBaseFilter **pFilter){　if (deviceId < 0)　return false;　// enumerate all video capture devices　CComPtr pCreateDevEnum;　HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,IID_ICreateDevEnum, (void**)&pCreateDevEnum);　if (hr != NOERROR)　{　　return false;　}　CComPtr pEm;　hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pEm, 0);　if (hr != NOERROR) 　{　　return false;　}　pEm->Reset();　ULONG cFetched;　IMoniker *pM;　int index = 0;　while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK, index <= deviceId)　{　　IPropertyBag *pBag;　　hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);　　if(SUCCEEDED(hr)) 　　{　　　VARIANT var;　　　var.vt = VT_BSTR;　　　hr = pBag->Read(L"FriendlyName", &var, NULL);　　　if (hr == NOERROR) 　　　{　　　　if (index == deviceId)　　　　{　　　　　pM->BindToObject(0, 0, IID_IBaseFilter, (void**)pFilter);　　　　}　　　　SysFreeString(var.bstrVal);　　　}　　　pBag->Release();　　}　　pM->Release();　　index ;　}　return true;}HRESULT CCaptureVideo::InitCaptureGraphBuilder(){　HRESULT hr;　// 创建IGraphBuilder接口　hr=CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&m_pGB);　// 创建ICaptureGraphBuilder2接口　hr = CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC,IID_ICaptureGraphBuilder2, (void **) &m_pCapture);　if (FAILED(hr))return hr;　m_pCapture->SetFiltergraph(m_pGB);　hr = m_pGB->QueryInterface(IID_IMediaControl, (void **)&m_pMC);　if (FAILED(hr))return hr;　hr = m_pGB->QueryInterface(IID_IVideoWindow, (LPVOID *) &m_pVW);　if (FAILED(hr))return hr;　return hr;}HRESULT CCaptureVideo::SetupVideoWindow(){　HRESULT hr;　hr = m_pVW->put_Owner((OAHWND)m_hWnd);　if (FAILED(hr))return hr;　hr = m_pVW->put_WindowStyle(WS_CHILD | WS_CLIPCHILDREN);　if (FAILED(hr))return hr;　ResizeVideoWindow();　hr = m_pVW->put_Visible(OATRUE);　return hr;}void CCaptureVideo::ResizeVideoWindow(){　if (m_pVW){　　//让图像充满整个窗口　　CRect rc;　　::GetClientRect(m_hWnd,&rc);　　m_pVW->SetWindowPosition(0, 0, rc.right, rc.bottom);　} }void CCaptureVideo::GrabOneFrame(BOOL bGrab){　bOneShot = bGrab;}void CCaptureVideo::FreeMediaType(AM_MEDIA_TYPE& mt){　if (mt.cbFormat != 0) {　　CoTaskMemFree((PVOID)mt.pbFormat);　　// Strictly unnecessary but tidier　　mt.cbFormat = 0;　　mt.pbFormat = NULL;　}　if (mt.pUnk != NULL) {　　mt.pUnk->Release();　　mt.pUnk = NULL;　}}共2页。 1 2 : 下载本文示例代码


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