OpenCV+海康威视摄像头的实时读取

xiaoxiao2021-11-30 26

本文由 @lonelyrains出品，转载请注明出处。文章链接： http://blog.csdn.net/lonelyrains/article/details/50350052

之前没想过会有这么多朋友遇到问题，所以建了一个qq群536898072，专门供大家以后一起交流讨论图像和机器学习的工程实践问题。

环境

硬件： PC：i7-4970 16GB内存摄像头型号：DS-2CD3310D-I（2.8mm）软件： windows-x64、vs2012、opencv2.4.8、hkvision5114-x64版本库

配置

保证使用SADP工具可以识别摄像头，然后配置IP与电脑在同一个网段。再保证可以从浏览器中访问。账号密码默认的一般是admin、a123456789(老版本的摄像头密码是12345)。登录成功后可能要求下载WebComponent控件，下载好了安装便是。如果仍然出现如下画面：则换一种浏览器试。一般是默认浏览器没问题的。配置使用sdk中自带的ClientDemo.exe工具可以访问配置sdk开发环境 – opencv的配置这里不展开讲opencv的配置，仅说明需要配置opencv环境变量、设置好对应的vs开发环境的属性配置 – 海康威视sdk属性配置因为是64位环境，为了增强属性配置的内聚性，单独添加新项目属性表，设置海康威视sdk的属性依赖库写全，为： HCNetSDK.lib;PlayCtrl.lib;ws2_32.lib;winmm.lib;GdiPlus.lib;IPHlpApi.Lib;%(AdditionalDependencies)

代码及说明

其中最终得到的帧保存在g_frameList.push_back(frametemp);中。前后设置了对应的锁，用来对该帧序列的读写进行保护。这一部分内容是要自己完成的。即定义变量：

CRITICAL_SECTION g_cs_frameList; std::list<Mat> g_frameList;

主函数中的调用代码，先建立线程，调用上述读摄像头的函数的回调，并把读到的帧序列保存在g_frameList中，然后再读取该序列，保存到Mat里即可：hh #include <opencv\highgui.h> #include <iostream> #include <cstdio> #include <cstring> #include <iostream> #include <windows.h> #include <HCNetSDK.h> /*#include "PlayM4.h"*/ #include <plaympeg4.h> #include <opencv2\opencv.hpp> #include <time.h> #include "global.h" #include "readCamera.h" #define USECOLOR 1 using namespace cv; using namespace std; //-------------------------------------------- int iPicNum=0;//Set channel NO. LONG nPort=-1; HWND hWnd=NULL; void yv12toYUV(char *outYuv, char *inYv12, int width, int height,int widthStep) { int col,row; unsigned int Y,U,V; int tmp; int idx; //printf("widthStep=%d.\n",widthStep); for (row=0; row<height; row++) { idx=row * widthStep; int rowptr=row*width; for (col=0; col<width; col++) { //int colhalf=col>>1; tmp = (row/2)*(width/2)+(col/2); // if((row==1)&&( col>=1400 &&col<=1600)) // { // printf("col=%d,row=%d,width=%d,tmp=%d.\n",col,row,width,tmp); // printf("row*width+col=%d,width*height+width*height/4+tmp=%d,width*height+tmp=%d.\n",row*width+col,width*height+width*height/4+tmp,width*height+tmp); // } Y=(unsigned int) inYv12[row*width+col]; U=(unsigned int) inYv12[width*height+width*height/4+tmp]; V=(unsigned int) inYv12[width*height+tmp]; // if ((col==200)) // { // printf("col=%d,row=%d,width=%d,tmp=%d.\n",col,row,width,tmp); // printf("width*height+width*height/4+tmp=%d.\n",width*height+width*height/4+tmp); // return ; // } if((idx+col*3+2)> (1200 * widthStep)) { //printf("row * widthStep=%d,idx+col*3+2=%d.\n",1200 * widthStep,idx+col*3+2); } outYuv[idx+col*3] = Y; outYuv[idx+col*3+1] = U; outYuv[idx+col*3+2] = V; } } //printf("col=%d,row=%d.\n",col,row); } //解码回调视频为YUV数据(YV12)，音频为PCM数据 void CALLBACK DecCBFun(long nPort,char * pBuf,long nSize,FRAME_INFO * pFrameInfo, long nReserved1,long nReserved2) { long lFrameType = pFrameInfo->nType; if(lFrameType ==T_YV12) { #if USECOLOR //int start = clock(); static IplImage* pImgYCrCb = cvCreateImage(cvSize(pFrameInfo->nWidth,pFrameInfo->nHeight), 8, 3);//得到图像的Y分量 yv12toYUV(pImgYCrCb->imageData, pBuf, pFrameInfo->nWidth,pFrameInfo->nHeight,pImgYCrCb->widthStep);//得到全部RGB图像 static IplImage* pImg = cvCreateImage(cvSize(pFrameInfo->nWidth,pFrameInfo->nHeight), 8, 3); cvCvtColor(pImgYCrCb,pImg,CV_YCrCb2RGB); //int end = clock(); #else static IplImage* pImg = cvCreateImage(cvSize(pFrameInfo->nWidth,pFrameInfo->nHeight), 8, 1); memcpy(pImg->imageData,pBuf,pFrameInfo->nWidth*pFrameInfo->nHeight); #endif //printf("%d\n",end-start); Mat frametemp(pImg),frame; //frametemp.copyTo(frame); // cvShowImage("IPCamera",pImg); // cvWaitKey(1); EnterCriticalSection(&g_cs_frameList); g_frameList.push_back(frametemp); LeaveCriticalSection(&g_cs_frameList); #if USECOLOR // cvReleaseImage(&pImgYCrCb); // cvReleaseImage(&pImg); #else /*cvReleaseImage(&pImg);*/ #endif //此时是YV12格式的视频数据，保存在pBuf中，可以fwrite(pBuf,nSize,1,Videofile); //fwrite(pBuf,nSize,1,fp); } /*************** else if (lFrameType ==T_AUDIO16) { //此时是音频数据，数据保存在pBuf中，可以fwrite(pBuf,nSize,1,Audiofile); } else { } *******************/ } ///实时流回调 void CALLBACK fRealDataCallBack(LONG lRealHandle,DWORD dwDataType,BYTE *pBuffer,DWORD dwBufSize,void *pUser) { DWORD dRet; switch (dwDataType) { case NET_DVR_SYSHEAD: //系统头 if (!PlayM4_GetPort(&nPort)) //获取播放库未使用的通道号 { break; } if(dwBufSize > 0) { if (!PlayM4_OpenStream(nPort,pBuffer,dwBufSize,1024*1024)) { dRet=PlayM4_GetLastError(nPort); break; } //设置解码回调函数只解码不显示 if (!PlayM4_SetDecCallBack(nPort,DecCBFun)) { dRet=PlayM4_GetLastError(nPort); break; } //设置解码回调函数解码且显示 //if (!PlayM4_SetDecCallBackEx(nPort,DecCBFun,NULL,NULL)) //{ // dRet=PlayM4_GetLastError(nPort); // break; //} //打开视频解码 if (!PlayM4_Play(nPort,hWnd)) { dRet=PlayM4_GetLastError(nPort); break; } //打开音频解码, 需要码流是复合流 // if (!PlayM4_PlaySound(nPort)) // { // dRet=PlayM4_GetLastError(nPort); // break; // } } break; case NET_DVR_STREAMDATA: //码流数据 if (dwBufSize > 0 && nPort != -1) { BOOL inData=PlayM4_InputData(nPort,pBuffer,dwBufSize); while (!inData) { Sleep(10); inData=PlayM4_InputData(nPort,pBuffer,dwBufSize); OutputDebugString(L"PlayM4_InputData failed \n"); } } break; } } void CALLBACK g_ExceptionCallBack(DWORD dwType, LONG lUserID, LONG lHandle, void *pUser) { char tempbuf[256] = {0}; switch(dwType) { case EXCEPTION_RECONNECT: //预览时重连 printf("----------reconnect--------%d\n", time(NULL)); break; default: break; } } unsigned readCamera(void *param) { //--------------------------------------- // 初始化 NET_DVR_Init(); //设置连接时间与重连时间 NET_DVR_SetConnectTime(2000, 1); NET_DVR_SetReconnect(10000, true); //--------------------------------------- // 获取控制台窗口句柄 //HMODULE hKernel32 = GetModuleHandle((LPCWSTR)"kernel32"); //GetConsoleWindow = (PROCGETCONSOLEWINDOW)GetProcAddress(hKernel32,"GetConsoleWindow"); //--------------------------------------- // 注册设备 LONG lUserID; NET_DVR_DEVICEINFO_V30 struDeviceInfo; lUserID = NET_DVR_Login_V30("192.168.2.64", 8000, "admin", "a123456789", &struDeviceInfo); if (lUserID < 0) { printf("Login error, %d\n", NET_DVR_GetLastError()); NET_DVR_Cleanup(); return -1; } //--------------------------------------- //设置异常消息回调函数 NET_DVR_SetExceptionCallBack_V30(0, NULL,g_ExceptionCallBack, NULL); //cvNamedWindow("IPCamera"); //--------------------------------------- //启动预览并设置回调数据流 NET_DVR_CLIENTINFO ClientInfo; ClientInfo.lChannel = 1; //Channel number 设备通道号 ClientInfo.hPlayWnd = NULL; //窗口为空，设备SDK不解码只取流 ClientInfo.lLinkMode = 0; //Main Stream ClientInfo.sMultiCastIP = NULL; LONG lRealPlayHandle; lRealPlayHandle = NET_DVR_RealPlay_V30(lUserID,&ClientInfo,fRealDataCallBack,NULL,TRUE); if (lRealPlayHandle<0) { printf("NET_DVR_RealPlay_V30 failed! Error number: %d\n",NET_DVR_GetLastError()); return 0; } //cvWaitKey(0); Sleep(-1); //fclose(fp); //--------------------------------------- //关闭预览 if(!NET_DVR_StopRealPlay(lRealPlayHandle)) { printf("NET_DVR_StopRealPlay error! Error number: %d\n",NET_DVR_GetLastError()); return 0; } //注销用户 NET_DVR_Logout(lUserID); NET_DVR_Cleanup(); return 0; } int main() { HANDLE hThread; unsigned threadID; Mat frame1; InitializeCriticalSection(&g_cs_frameList); hThread = (HANDLE)_beginthreadex( NULL, 0, &readCamera, NULL, 0, &threadID ); ... EnterCriticalSection(&g_cs_frameList); if(g_frameList.size()) { list<Mat>::iterator it; it = g_frameList.end(); it--; Mat dbgframe = (*(it)); //imshow("frame from camera",dbgframe); //dbgframe.copyTo(frame1); //dbgframe.release(); (*g_frameList.begin()).copyTo(frame[i]); frame1 = dbgframe; g_frameList.pop_front(); } g_frameList.clear(); // 丢掉旧的帧 LeaveCriticalSection(&g_cs_frameList); ... return 0; }

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