MFC中利用OpenCV实现视频播放

近期项目中在学习全景相机相关知识

当然首先要开始将基本的MFC学会才能封装SDK

首先建立MFC对话框工程

                 具体的详细知识就不说了，网上有很多的教程。

添加如下控件

中间显示部分是picture control控件

采用定时器更新picture 显示框

首先包含opencv相关的头文件，在CUpanoCameraDlg.h中添加以下变量

private:       CRect rect;CStatic* pStc; //标识图像显示的Picture控件CDC* pDC; //视频显示控件设备上下文HDC hDC; //视频显示控件设备句柄CvCapture* capture; //视频获取结构

public: afx_msg void OnBnClickedButvideo(); afx_msg void OnTimer(UINT_PTR nIDEvent);

在 UpanoCameraDlg.cpp中添加ON_WM_TIMER()消息映射,

BEGIN_MESSAGE_MAP(CUpanoCameraDlg, CDialogEx)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_TIMER()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BUTPLAY, &CUpanoCameraDlg::OnBnClickedButplay)ON_BN_CLICKED(IDC_BUTVIDEO, &CUpanoCameraDlg::OnBnClickedButvideo)END_MESSAGE_MAP()

在BOOL CUpanoCameraDlg::OnInitDialog()中添加

pStc=(CStatic *)GetDlgItem(IDC_PICUPANO);//IDC_VIEW为Picture控件IDpStc->GetClientRect(&rect);//将CWind类客户区的坐标点传给矩形pDC=pStc->GetDC(); //得到Picture控件设备上下文hDC=pDC->GetSafeHdc(); //得到控件设备上下文的句柄 

添加按键消息处理函数void CUpanoCameraDlg::OnBnClickedButvideo()，可以在资源按键控件直接双击，就能生成函数模版

void CUpanoCameraDlg::OnBnClickedButvideo(){// TODO: 在此添加控件通知处理程序代码    capture = cvCaptureFromCAM(0);//打开USB摄像头//capture=cvCaptureFromAVI("result.avi");  if (!capture){//AfxMessageBox("无法获得摄像头");fprintf(stderr, "Can not open camera.\n");return;}/*IplImage* m_Frame;  m_Frame=cvQueryFrame(capture);  CvvImage m_CvvImage;  m_CvvImage.CopyOf(m_Frame,1);     m_CvvImage.DrawToHDC(hDC, &rect);  */SetTimer(1,100,NULL);//设置定时器，视频刷新定时器，决定了帧率}

添加OnTimer处理函数，类似回调函数，注意OpenCV2.2以后就不支持CvvImage类了，所以需要自己添加CvvImage.h和CvvImage.cpp，源码见附件

void CUpanoCameraDlg::OnTimer(UINT_PTR nIDEvent){// TODO: 在此添加消息处理程序代码和/或调用默认值//    KillTimer(nIDEvent);IplImage* m_Frame;  m_Frame=cvQueryFrame(capture);  //从视频中取出一幅图像CvvImage m_CvvImage;  m_CvvImage.CopyOf(m_Frame,1);     m_CvvImage.DrawToHDC(hDC, &rect);  //通过句柄hDC，显示CUpanoCameraDlg::OnTimer(nIDEvent);  }

或者将SetTimer(1,100,NULL) 改为SetTimer(1,100,Func)，其中Func为自定义回调函数

VOID CALLBACK Func(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime ){//MessageBox(NULL,L"Hello",L"ALARM",1);如果报错,则需要在字符串变量前加上  L}void CUpanoCameraDlg::OnBnClickedButvideo(){// TODO: 在此添加控件通知处理程序代码    capture = cvCaptureFromCAM(0);//capture=cvCaptureFromAVI("result.avi");  if (!capture){//AfxMessageBox("无法获得摄像头");fprintf(stderr, "Can not open camera.\n");return;}//SetTimer(1,100,NULL);//设置定时器SetTimer(1,5000,Func);}

效果如下，其他暂停函数就没有贴上来了，这些按照自己的想法加

参考：

附件：

CvvImage.h

#ifndef CVVIMAGE_CLASS_DEF#define CVVIMAGE_CLASS_DEF#ifndef RC_OPENCV_2_1_0#include <opencv/cv.h>#include <opencv/highgui.h>/* CvvImage class definition */class  CvvImage{public:CvvImage();virtual ~CvvImage();/* Create image (BGR or grayscale) */virtual bool  Create( int width, int height, int bits_per_pixel, int image_origin = 0 );/* Load image from specified file */virtual bool  Load( const char* filename, int desired_color = 1 );/* Load rectangle from the file */virtual bool  LoadRect( const char* filename,int desired_color, CvRect r );#if defined WIN32 || defined _WIN32virtual bool  LoadRect( const char* filename,int desired_color, RECT r ){return LoadRect( filename, desired_color,cvRect( r.left, r.top, r.right - r.left, r.bottom - r.top ));}#endif/* Save entire image to specified file. */virtual bool  Save( const char* filename );/* Get copy of input image ROI */virtual void  CopyOf( CvvImage& image, int desired_color = -1 );virtual void  CopyOf( IplImage* img, int desired_color = -1 );IplImage* GetImage() { return m_img; };virtual void  Destroy(void);/* width and height of ROI */int Width() { return !m_img ? 0 : !m_img->roi ? m_img->width : m_img->roi->width; };int Height() { return !m_img ? 0 : !m_img->roi ? m_img->height : m_img->roi->height;};int Bpp() { return m_img ? (m_img->depth & 255)*m_img->nChannels : 0; };virtual void  Fill( int color );/* draw to highgui window */virtual void  Show( const char* window );#if defined WIN32 || defined _WIN32/* draw part of image to the specified DC */virtual void  Show( HDC dc, int x, int y, int width, int height,int from_x = 0, int from_y = 0 );/* draw the current image ROI to the specified rectangle of the destination DC */virtual void  DrawToHDC( HDC hDCDst, RECT* pDstRect );#endifprotected:IplImage*  m_img;};typedef CvvImage CImage;#endif#endif

CvvImage.cpp

#include "stdafx.h"#ifndef RC_OPENCV_2_1_0#include "CvvImage.h"//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CV_INLINE RECT NormalizeRect( RECT r );CV_INLINE RECT NormalizeRect( RECT r ){int t;if( r.left > r.right ){t = r.left;r.left = r.right;r.right = t;}if( r.top > r.bottom ){t = r.top;r.top = r.bottom;r.bottom = t;}return r;}CV_INLINE CvRect RectToCvRect( RECT sr );CV_INLINE CvRect RectToCvRect( RECT sr ){sr = NormalizeRect( sr );return cvRect( sr.left, sr.top, sr.right - sr.left, sr.bottom - sr.top );}CV_INLINE RECT CvRectToRect( CvRect sr );CV_INLINE RECT CvRectToRect( CvRect sr ){RECT dr;dr.left = sr.x;dr.top = sr.y;dr.right = sr.x + sr.width;dr.bottom = sr.y + sr.height;return dr;}CV_INLINE IplROI RectToROI( RECT r );CV_INLINE IplROI RectToROI( RECT r ){IplROI roi;r = NormalizeRect( r );roi.xOffset = r.left;roi.yOffset = r.top;roi.width = r.right - r.left;roi.height = r.bottom - r.top;roi.coi = 0;return roi;}void  FillBitmapInfo( BITMAPINFO* bmi, int width, int height, int bpp, int origin ){assert( bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32));BITMAPINFOHEADER* bmih = &(bmi->bmiHeader);memset( bmih, 0, sizeof(*bmih));bmih->biSize = sizeof(BITMAPINFOHEADER);bmih->biWidth = width;bmih->biHeight = origin ? abs(height) : -abs(height);bmih->biPlanes = 1;bmih->biBitCount = (unsigned short)bpp;bmih->biCompression = BI_RGB;if( bpp == 8 ){RGBQUAD* palette = bmi->bmiColors;int i;for( i = 0; i < 256; i++ ){palette[i].rgbBlue = palette[i].rgbGreen = palette[i].rgbRed = (BYTE)i;palette[i].rgbReserved = 0;}}}CvvImage::CvvImage(){m_img = 0;}void CvvImage::Destroy(){cvReleaseImage( &m_img );}CvvImage::~CvvImage(){Destroy();}bool  CvvImage::Create( int w, int h, int bpp, int origin ){const unsigned max_img_size = 10000;if( (bpp != 8 && bpp != 24 && bpp != 32) ||(unsigned)w >=  max_img_size || (unsigned)h >= max_img_size ||(origin != IPL_ORIGIN_TL && origin != IPL_ORIGIN_BL)){assert(0); // most probably, it is a programming errorreturn false;}if( !m_img || Bpp() != bpp || m_img->width != w || m_img->height != h ){if( m_img && m_img->nSize == sizeof(IplImage))Destroy();/* prepare IPL header */m_img = cvCreateImage( cvSize( w, h ), IPL_DEPTH_8U, bpp/8 );}if( m_img )m_img->origin = origin == 0 ? IPL_ORIGIN_TL : IPL_ORIGIN_BL;return m_img != 0;}void  CvvImage::CopyOf( CvvImage& image, int desired_color ){IplImage* img = image.GetImage();if( img ){CopyOf( img, desired_color );}}#define HG_IS_IMAGE(img)                                                  \((img) != 0 && ((const IplImage*)(img))->nSize == sizeof(IplImage) && \((IplImage*)img)->imageData != 0)void  CvvImage::CopyOf( IplImage* img, int desired_color ){if( HG_IS_IMAGE(img) ){int color = desired_color;CvSize size = cvGetSize( img ); if( color < 0 )color = img->nChannels > 1;if( Create( size.width, size.height,(!color ? 1 : img->nChannels > 1 ? img->nChannels : 3)*8,img->origin )){cvConvertImage( img, m_img, 0 );}}}bool  CvvImage::Load( const char* filename, int desired_color ){IplImage* img = cvLoadImage( filename, desired_color );if( !img )return false;CopyOf( img, desired_color );cvReleaseImage( &img );return true;}bool  CvvImage::LoadRect( const char* filename,int desired_color, CvRect r ){if( r.width < 0 || r.height < 0 ) return false;IplImage* img = cvLoadImage( filename, desired_color );if( !img )return false;if( r.width == 0 || r.height == 0 ){r.width = img->width;r.height = img->height;r.x = r.y = 0;}if( r.x > img->width || r.y > img->height ||r.x + r.width < 0 || r.y + r.height < 0 ){cvReleaseImage( &img );return false;}/* truncate r to source image */if( r.x < 0 ){r.width += r.x;r.x = 0;}if( r.y < 0 ){r.height += r.y;r.y = 0;}if( r.x + r.width > img->width )r.width = img->width - r.x;if( r.y + r.height > img->height )r.height = img->height - r.y;cvSetImageROI( img, r );CopyOf( img, desired_color );cvReleaseImage( &img );return true;}bool  CvvImage::Save( const char* filename ){if( !m_img )return false;cvSaveImage( filename, m_img );return true;}void  CvvImage::Show( const char* window ){if( m_img )cvShowImage( window, m_img );}void  CvvImage::Show( HDC dc, int x, int y, int w, int h, int from_x, int from_y ){if( m_img && m_img->depth == IPL_DEPTH_8U ){uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];BITMAPINFO* bmi = (BITMAPINFO*)buffer;int bmp_w = m_img->width, bmp_h = m_img->height;FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );from_x = MIN( MAX( from_x, 0 ), bmp_w - 1 );from_y = MIN( MAX( from_y, 0 ), bmp_h - 1 );int sw = MAX( MIN( bmp_w - from_x, w ), 0 );int sh = MAX( MIN( bmp_h - from_y, h ), 0 );SetDIBitsToDevice(dc, x, y, sw, sh, from_x, from_y, from_y, sh,m_img->imageData + from_y*m_img->widthStep,bmi, DIB_RGB_COLORS );}}void  CvvImage::DrawToHDC( HDC hDCDst, RECT* pDstRect ) {if( pDstRect && m_img && m_img->depth == IPL_DEPTH_8U && m_img->imageData ){uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];BITMAPINFO* bmi = (BITMAPINFO*)buffer;int bmp_w = m_img->width, bmp_h = m_img->height;CvRect roi = cvGetImageROI( m_img );CvRect dst = RectToCvRect( *pDstRect );if( roi.width == dst.width && roi.height == dst.height ){Show( hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y );return;}if( roi.width > dst.width ){SetStretchBltMode(hDCDst,           // handle to device contextHALFTONE );}else{SetStretchBltMode(hDCDst,           // handle to device contextCOLORONCOLOR );}FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );::StretchDIBits(hDCDst,dst.x, dst.y, dst.width, dst.height,roi.x, roi.y, roi.width, roi.height,m_img->imageData, bmi, DIB_RGB_COLORS, SRCCOPY );}}void  CvvImage::Fill( int color ){cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );}#endif