directshow实现视频捕获.doc

directshow实现视频捕获（源码）vs2005金钻传奇 我用visual studio 2005编了一个摄像头预览程序，还可以导出成avi文件，前提是要安装directshow，并搭建好环境，我安装的是directx 9.0b，搭建环境很简单，网上有很多，注意在项目-属性-配置属性-链接器-输入中要加上strmbasd.lib winmm.lib（中间有空格）。源代码如下：/*CaptureClass.h*/#pragma once#include #include #include #include /ISampleGrabber接口要求的 #ifndef SAFE_RELEASE#define SAFE_RELEASE(x) if (x) x-Release(); x = NULL; #endifclass CCaptureClasspublic:CCaptureClass(void);public:CCaptureClass(void);int EnumDevices(HWND hList); /void SaveGraph(TCHAR *wFileName); /保存滤波器链表void ConfigCameraPin(HWND hwndParent); /配置摄像头的视频格式void ConfigCameraFilter(HWND hwndParent); /配置摄像头的图像参数HRESULT CaptureImages(CString inFileName); /捕获保存视频HRESULT PreviewImages(int iDeviceID , HWND hWnd); /采集预览视频private:HWND m_hWnd; /视频显示窗口的句柄IGraphBuilder *m_pGB; /滤波器链表管理器ICaptureGraphBuilder2 *m_pCapture; /增强型捕获滤波器链表管理器IBaseFilter *m_pBF; /捕获滤波器IMediaControl *m_pMC; /媒体控制接口IVideoWindow *m_pVW; /视频显示窗口接口IBaseFilter *pMux; /写文件滤波器protected:bool BindFilter(int deviceId,IBaseFilter *pFilter); /把指定的设备滤波器捆绑到链表中void ResizeVideoWindow(); /更改视频显示窗口HRESULT SetupVideoWindow(); /设置视频显示窗口的特性HRESULT InitCaptureGraphBuilder(); /创建滤波器链表管理器，查询其各种控制接口;/*CaptureClass.cpp*/#include StdAfx.h#include CaptureClass.h/*/* 类构造函数实现 */*/CCaptureClass:CCaptureClass(void)CoInitialize(NULL); /COM库初始化m_hWnd = NULL; /视频显示窗口的句柄m_pVW = NULL ; /视频窗口接口指针清空m_pMC = NULL ; /媒体控制接口指针清空m_pGB = NULL ; /滤波器链表管理器接口指针清空m_pBF = NULL ; /捕获滤波器接口指针清空m_pCapture = NULL ; /增强型捕获滤波器链表管理器接口指针清空/*/* 析构函数 */*/CCaptureClass:CCaptureClass(void)if(m_pMC) m_pMC -Stop(); /首先停止媒体if(m_pVW) m_pVW-put_Visible(OAFALSE); /视频窗口不可见 m_pVW-put_Owner(NULL); /视频窗口的父窗口清空SAFE_RELEASE(m_pCapture); /释放增强型捕获滤波器链表管理器接口SAFE_RELEASE(m_pMC); /释放媒体控制接口SAFE_RELEASE(m_pGB); /释放滤波器链表管理器接口SAFE_RELEASE(m_pBF); /释放捕获滤波器接口CoUninitialize( ); /卸载COM库/*/* 把指定采集设备与滤波器捆绑 */*/bool CCaptureClass:BindFilter(int deviceId,IBaseFilter *pFilter)if( deviceId CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pEm,0);if( hr != NOERROR ) return false ;pEm-Reset(); /复位该设备ULONG cFetched;IMoniker *pM;int index = 0 ;/获取设备while( hr = pEm-Next(1,&pM,&cFetched),hr = S_OK , index BindToStorage(0,0,IID_IPropertyBag,(void*)&pBag); if(SUCCEEDED(hr) VARIANT var ; var.vt = VT_BSTR; /保存的是二进制的数据 hr = pBag-Read(LFriendlyName,&var,NULL); /获取FriendlyName形式的信息 if( hr = NOERROR ) /采集设备与捕获滤波器捆绑 if( index = deviceId ) pM-BindToObject(0,0,IID_IBaseFilter,(void*)pFilter); SysFreeString(var.bstrVal); /释放二进制数据资源，必须释放 pBag -Release(); pM-Release(); index+;return true ;/*/* 设置视频显示窗口的特性 */*/HRESULT CCaptureClass:SetupVideoWindow()HRESULT hr ;/m_hWnd为类CCaptureClass的成员变量，在使用该函数前须初始化hr = m_pVW-put_Visible(OAFALSE); /视频窗口不可见hr = m_pVW-put_Owner(OAHWND)m_hWnd); /窗口所有者：传入的窗口句柄if(FAILED(hr) return hr ;hr = m_pVW-put_WindowStyle( WS_CHILD | WS_CLIPCHILDREN); /窗口风格设置if( FAILED(hr) return hr ;ResizeVideoWindow(); /更改窗口大小hr = m_pVW-put_Visible(OATRUE); /视频窗口可见return hr ;/*/* 更改视频窗口大小 */*/void CCaptureClass:ResizeVideoWindow()if( m_pVW ) /让图像充满整个指定窗口 CRect rc ; :GetClientRect(m_hWnd,&rc); /获取显示窗口的客户区 m_pVW-SetWindowPosition(0,0,rc.right,rc.bottom); /设置视频显示窗口的位置/*/* 开始预览视频设备 */*/HRESULT CCaptureClass:PreviewImages(int iDeviceID , HWND hWnd)HRESULT hr ;/初始化视频捕获滤波器链表管理器hr = InitCaptureGraphBuilder();if(FAILED(hr) AfxMessageBox(_T(Failed to get video interfaces!); return hr ;/把指定采集设备与滤波器绑定if( !BindFilter(iDeviceID,&m_pBF) return S_FALSE;/把滤波器添加到滤波器链表中hr = m_pGB-AddFilter(m_pBF,LCapture Filter);/渲染媒体，把链表中的滤波器链接起来hr = m_pCapture-RenderStream(&PIN_CATEGORY_PREVIEW,&MEDIATYPE_Video,m_pBF,NULL,NULL);if(FAILED(hr) AfxMessageBox(_T(Cant build the graph); return hr ;/设置视频显示窗口m_hWnd = hWnd; /初始化窗口句柄SetupVideoWindow(); /设置显示窗口hr = m_pMC-Run();if(FAILED(hr) AfxMessageBox(_T(Couldnt run the graph!); return hr ;return S_OK ;/*/* 设置捕获视频的文件，开始捕捉视频数据写文件 */*/HRESULT CCaptureClass:CaptureImages(CString inFileName)HRESULT hr = 0 ;m_pMC -Stop(); /先停止视频/设置文件名，注意第二个参数的类型hr = m_pCapture-SetOutputFileName(&MEDIASUBTYPE_Avi,inFileName.AllocSysString(),&pMux,NULL) ;/渲染媒体，链接所有滤波器hr = m_pCapture-RenderStream(&PIN_CATEGORY_CAPTURE,&MEDIATYPE_Video,m_pBF,NULL,pMux);pMux-Release();m_pMC-Run(); /回复视频return hr ;int CCaptureClass:EnumDevices(HWND hList)if (!hList) return -1;int id = 0;/枚举视频扑捉设备ICreateDevEnum *pCreateDevEnum; /*此接口生成一个特殊类别的设备枚举器，The System Device Enumerator exposes this interface*/HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,IID_ICreateDevEnum, (void*)&pCreateDevEnum);if (hr != NOERROR)return -1;IEnumMoniker *pEm=0; /此接口用来枚举一个名字组件或者枚举名字表中的名字hr = pCreateDevEnum-CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pEm, 0);/CreateClassEnumerator方法为指定的设备类生成一个类枚举器 if (hr != NOERROR)return -1;pEm-Reset(); /由于IEnumMoniker接口有一个标准的参考计数，pEm-Release()，一定要释放此接口ULONG cFetched;IMoniker *pM; /此接口包含允许你使用“名字”对象的方法，而名字对象包含能唯一确定COM对象的方法while(hr = pEm-Next(1, &pM, &cFetched), hr=S_OK) /返回枚举器队列中指定数目的条款，下“1”个 IPropertyBag *pBag; /接口IPropertyBag提供一个有属性包的对象，对象可以在包里存储它的特征 hr = pM-BindToStorage(0, 0, IID_IPropertyBag, (void *)&pBag); /返回包含被“moniker”确定的对象的存储位置的接口指针 if(SUCCEEDED(hr) VARIANT var; /VARIANT结构体包括很多类型 var.vt = VT_BSTR; /vt, describes which of the union members is valid，bstrVal是有效的 hr = pBag-Read(LFriendlyName, &var, NULL); /Asks the property bag to read the named /property into a caller-initialized VARIANT，var接收 if (hr = NOERROR) /CP_ACP：The current system Windows ANSI code page /var.bstrVal被转化的 /-1表示长度被自动计算；str表示转化侯接收目标的地方；两个NULL使函数更快 id+; /此函数处理指定的消息，hList窗口的句柄，此窗口处理此消息；CB_ADDSTRING要处理的消息 :SendMessage(hList, CB_ADDSTRING, 0,(LPARAM)var.bstrVal); SysFreeString(var.bstrVal); pBag-Release(); pM-Release();return id;HRESULT CCaptureClass:InitCaptureGraphBuilder()HRESULT hr ;/创建IGraphBuilder接口hr = CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC_SERVER,IID_IGraphBuilder,(void*)&m_pGB);if(FAILED(hr) return hr ;/创建ICaptureGraphBuilder2接口hr = CoCreateInstance(CLSID_CaptureGraphBuilder2,NULL,CLSCTX_INPROC,IID_ICaptureGraphBuilder2,(void*)&m_pCapture) ;if(FAILED(hr) return hr ;/初始化滤波器链表管理器IGraphBuilderm_pCapture-SetFiltergraph(m_pGB);/查询媒体控制接口hr = m_pGB-QueryInterface(IID_IMediaControl,(void*)&m_pMC);if(FAILED(hr) return hr ;/查询视频窗口接口hr = m_pGB - QueryInterface(IID_IVideoWindow,(LPVOID*)&m_pVW);if(FAILED(hr) return hr ;return hr ;/配置摄像头数据源格式：分辨率、RGB/I420等void CCaptureClass:ConfigCameraPin(HWND hwndParent)HRESULT hr ; /返回值IAMStreamConfig *pSC ; /流配置接口ISpecifyPropertyPages *pSpec ; /属性页接口/只有停止后，才能进行引脚属性的设置m_pMC -Stop();/首先查询捕获CAPTURE、视频VIDEO接口hr = m_pCapture-FindInterface(&PIN_CATEGORY_CAPTURE,&MEDIATYPE_Video,m_pBF,IID_IAMStreamConfig,(void*)&pSC);CAUUID cauuid ; /所有属性页结构体hr = pSC-QueryInterface(IID_ISpecifyPropertyPages,(void*)&pSpec);if( hr = S_OK ) hr = pSpec-GetPages(&cauuid); /获取所有属性页 /显示属性页 hr = OleCreatePropertyFrame(hwndParent,30,30,NULL,1,(IUnknown*)&pSC,cauuid.cElems,(GUID*)cauuid.pElems,0,0,NULL); /释放内存、资源 CoTaskMemFree(cauuid.pElems); pSpec-Release(); pSC-Release();/回复运行m_pMC-Run();/配置图像参数：亮度、色度、饱和度等void CCaptureClass:ConfigCameraFilter(HWND hwndParent)HRESULT hr = 0 ;ISpecifyPropertyPages *pProp ;hr = m_pBF-QueryInterface(IID_ISpecifyPropertyPages,(void*)&pProp);if(SUCCEEDED(hr) /获取滤波器名称和IUnknown接口指针 FILTER_INFO FilterInfo ; hr = m_pBF-QueryFilterInfo(&FilterInfo); IUnknown *pFilterUnk ; m_pBF-QueryInterface(IID_IUnknown,(void*)&pFilterUnk); /显示该页 CAUUID caGUID ; pProp -GetPages(&caGUID); OleCreatePropertyFrame( hwndParent, 0,0, FilterInfo.achName, 1, &pFilterUnk, caGUID.cElems, caGUID.pElems, 0, 0,NULL ); /释放内存、资源 CoTaskMemFree(caGUID.pElems); pFilterUnk-Release(); FilterInfo.pGraph -Release(); pProp-Release();m_pMC-Run();在dialog类中声明一个CaptureClass的对象m_cap：/*CaptureVideoDlg.h*/#pragma once#include afxwin.h#include CaptureClass.h/ CCaptureVideoDlg 对话框class CCaptureVideoDlg : public CDialog/ 构造public:CCaptureVideoDlg(CWnd* pParent = NULL); / 标准构造函数/ 对话框数据enum IDD = IDD_CAPTUREVIDEO_DIALOG ;protected:virtual void DoDataExchange(CDataExchange* pDX); / DDX/DDV 支持/ 实现protected:HICON m_hIcon;/ 生成的消息映射函数virtual BOOL OnInitDialog();afx_msg void OnPaint();afx_msg HCURSOR OnQueryDragIcon();DECLARE_MESSAGE_MAP()public:CStatic m_videoWindow;public:CComboBox m_listCtrl;CCaptureClass m_cap ;public:afx_msg void OnBnClickedPreview();public:afx_msg void OnBnClickedCapture();public:afx_msg void OnBnClickedVideoFormat();public:afx_msg void OnBnClickedImageParameter();public:afx_msg void OnBnClickedExit();/*CaptureVideoDlg.cpp*/#include stdafx.h#include CaptureVideo.h#include CaptureVideoDlg.hBOOL CCaptureVideoDlg:OnInitDialog()/ TODO: 在此添加额外的初始化代码m_cap.EnumDevices(m_listCtrl);/