最近在做關於大華nvr 獲取大華攝像頭的資料流和儲存到硬碟中的視訊檔案，發現網上關於大華攝像頭的二次開發的部落格比較少，特分享一下最近完成的關於大華nvr的兩個小功能，希望能夠給大家一些啟發與幫助。

#include <stdio.h>
#include <iostream>
#include <Windows.h>
#include "dhnetsdk.h"
#include "dhplay.h"
#include <cstring>
#include <winCon.h>
#include "opencv2/opencv.hpp"
 

using namespace std;
#define SWITCH 1
#define PLAYPORT 1
typedef struct VideoData
{
    char* data;
    int width;
    int height;
}TVideoData; //視訊資料結構體
list<VideoData> videolist;//list儲存視訊資料

//解碼函式 將YUV420解碼為IplImage
IplImage* YUV420_To_IplImage_Opencv(char* pYUV420, int width, int height)
{
    if
 
 (!pYUV420)
    {
        return NULL;
    }
    IplImage *yuvimage, *rgbimg, *yimg, *uimg, *vimg, *uuimg, *vvimg;
    int nWidth = width;
    int nHeight = height;
    rgbimg = cvCreateImage(cvSize(nWidth, nHeight), IPL_DEPTH_8U, 3);
    yuvimage = cvCreateImage(cvSize(nWidth, nHeight), IPL_DEPTH_8U, 3
 
);
    yimg = cvCreateImageHeader(cvSize(nWidth, nHeight), IPL_DEPTH_8U, 1);
    uimg = cvCreateImageHeader(cvSize(nWidth / 2, nHeight / 2), IPL_DEPTH_8U, 1);
    vimg = cvCreateImageHeader(cvSize(nWidth / 2, nHeight / 2), IPL_DEPTH_8U, 1);
    uuimg = cvCreateImage(cvSize(nWidth, nHeight), IPL_DEPTH_8U, 1);
    vvimg = cvCreateImage(cvSize(nWidth, nHeight), IPL_DEPTH_8U, 1);
    cvSetData(yimg, pYUV420, nWidth);
    cvSetData(uimg, pYUV420 + nWidth*nHeight, nWidth / 2);
    cvSetData(vimg, pYUV420 + long(nWidth*nHeight*1.25), nWidth / 2);
    cvResize(uimg, uuimg, CV_INTER_LINEAR);
    cvResize(vimg, vvimg, CV_INTER_LINEAR);
    cvMerge(yimg, uuimg, vvimg, NULL, yuvimage);
    cvCvtColor(yuvimage, rgbimg, CV_YCrCb2RGB);
    cvReleaseImage(&uuimg);
    cvReleaseImage(&vvimg);
    cvReleaseImageHeader(&yimg);
    cvReleaseImageHeader(&uimg);
    cvReleaseImageHeader(&vimg);
    cvReleaseImage(&yuvimage);
    if (!rgbimg)
    {
        return NULL;
    }
    CvSize sz;
    IplImage *desc;
    sz.width = rgbimg->width*0.5;
    sz.height = rgbimg->height*0.5;
    desc = cvCreateImage(sz, rgbimg->depth, rgbimg->nChannels);
    cvResize(rgbimg, desc, CV_INTER_CUBIC);
    cvShowImage("test", desc);
    cvWaitKey(1);
    cvReleaseImage(&desc);
    return rgbimg;
}
//裝置斷線回撥函式
void CALLBACK DisConnectFunc(LONG lLoginID, char *pchDVRIP, LONG nDVRPort, DWORD dwUser)
{
    printf("裝置斷線.\n");
    return;
}
//自動重連回調函式
void CALLBACK AutoReConnectFunc(LONG lLoginID, char *pchDVRIP, LONG nDVRPort, DWORD dwUser)
{
    printf("自動重連成功.\n");
    return;
}
//實時資料流回撥函式 由於使用的NVR所以使用擴充套件回撥函式
void CALLBACK RealDataCallBackEx(LONG lRealHandle, DWORD dwDataType, BYTE *pBuffer, DWORD dwBufSize, LONG lParam, DWORD dwUser)
{
    if (dwDataType == 0)  //原始視訊流送播放庫    
    {
        PLAY_InputData(PLAYPORT, pBuffer, dwBufSize);
    }
}
//解碼回撥函式
void CALLBACK DecCBFun(LONG nPort, char * pBuf, LONG nSize, FRAME_INFO * pFrameInfo, void* pUserData, LONG nReserved2)
{
    // pbuf裡的資料是YUV I420格式的資料   
    if (pFrameInfo->nType == 3) //視訊資料   
    {
        //將回調獲取的YUV420資料放入list資料結構中
        //這種方式可以保證所有資料不會丟失
        //若做實時顯示,可以進行丟幀處理來降低卡頓。
        TVideoData data;
        data.data = (char*)malloc(sizeof(char)*nSize);
        memcpy(data.data,pBuf,nSize);
        data.height = pFrameInfo->nHeight;
        data.width = pFrameInfo->nWidth;
        videolist.push_back(data);
    }
    return;
}
//檔案回放下載進度回撥函式
void CALLBACK cbDownLoadPos(LLONG lPlayHandle, DWORD dwTotalSize, DWORD dwDownLoadSize, LDWORD dwUser)
{
    //printf("cbDownLoadPos\n");
}
//檔案回放資料回撥函式
int CALLBACK fDownLoadDataCallBack(LLONG lRealHandle, DWORD dwDataType, BYTE *pBuffer, DWORD dwBufSize, LDWORD dwUser)
{
    if (dwDataType == 0)  //原始視訊流送播放庫    
    {
        PLAY_InputData(PLAYPORT, pBuffer, dwBufSize);
    }
    return 1;
}
//資料處理函式
DWORD WINAPI DataDeal(LPVOID lpParameter)
{
    while (1)
    {
        while (videolist.size() == 0);
        TVideoData data = videolist.front();
        double Time = (double)cvGetTickCount();
        YUV420_To_IplImage_Opencv(data.data, data.width, data.height);
        Time = (double)cvGetTickCount() - Time;
        printf("run time = %gms\n", Time / (cvGetTickFrequency() * 1000));
        free(data.data);
        videolist.pop_front();
    }
    return 0;
}
int main(void)
{
    //功能一：實時顯示預覽
    //功能二：檔案下載回放
    PLAY_OpenStream(PLAYPORT, 0, 0, 1024*900);
    PLAY_SetDecCallBackEx(PLAYPORT, DecCBFun, NULL);
    PLAY_Play(PLAYPORT, NULL);
    //以上程式碼為啟用解碼
    CLIENT_LogClose();
    NET_DEVICEINFO_Ex info_ex = { 0 };
    int err = 0;
    unsigned long lLogin = 0;
    LLONG lSearch = 0;
    LLONG lRealPlay = 0;
    CLIENT_Init(DisConnectFunc, 0);
    CLIENT_SetAutoReconnect(AutoReConnectFunc, 0);
    lLogin = CLIENT_LoginEx2("192.168.0.101", 37777, "admin", "kz123456", EM_LOGIN_SPEC_CAP_TCP, NULL, &info_ex, &err);
    if (lLogin == 0)
    {
        printf("login error!\r\n");
    }
    else
    {
        printf("login success!\r\n");
#if SWITCH //SWITCH 巨集定義，可通過修改該開關切換實時資料顯示和檔案回撥顯示
        //1.實時取流。
        lRealPlay = CLIENT_RealPlayEx(lLogin, 2, NULL, DH_RType_Realplay);
        //CLIENT_RealPlayEx 第二個引數為NVR 播放通道 此處為單通道顯示可改為多通道預覽
        if (lRealPlay != 0)
        {
            CLIENT_SetRealDataCallBackEx(lRealPlay, RealDataCallBackEx, 0, 0x0000001f);
        }
        HANDLE hThread1 = CreateThread(NULL, 0, DataDeal, NULL, 0, NULL);
#endif
#if !SWITCH
        //2.檔案取流 回放
        NET_RECORDFILE_INFO info = { 0 };
        LPNET_TIME time_start = (LPNET_TIME)malloc(sizeof(LPNET_TIME));
        LPNET_TIME time_end = (LPNET_TIME)malloc(sizeof(LPNET_TIME));
        time_start->dwYear = 2017;
        time_start->dwMonth = 11;
        time_start->dwDay = 10;
        time_start->dwHour = 9;
        time_start->dwMinute = 10;
        time_start->dwSecond = 0;
        time_end->dwYear = 2017;
        time_end->dwMonth = 11;
        time_end->dwDay = 10;
        time_end->dwHour = 9;
        time_end->dwMinute = 15;
        time_end->dwSecond = 0;
        //設定回放時間段
        lSearch = CLIENT_FindFile(lLogin, 0, 0, NULL, time_start, time_end, FALSE, 1000);
        //CLIENT_FindFile 第二個引數為通道號，檔案回放只允許開啟一個通道進行檔案回放 第三個引數為檔案型別
        int result = CLIENT_FindNextFile(lSearch, &info);
        //查詢到符合引數的檔名 儲存於info結構體中
        LONG state = CLIENT_PlayBackByRecordFileEx(lLogin,&info,NULL,cbDownLoadPos,NULL,fDownLoadDataCallBack,NULL);
        HANDLE hThread1 = CreateThread(NULL, 0, DataDeal, NULL, 0, NULL);
#endif
    }
    getchar();
    //釋放網路庫  
    CLIENT_StopRealPlay(lRealPlay);
    CLIENT_Logout(lLogin);
    CLIENT_Cleanup();
    //關閉播放通道，釋放資源  
    PLAY_Stop(PLAYPORT);
    PLAY_CloseStream(PLAYPORT);
    return 0;
}

PS:部分程式碼借鑑了某位博主的程式碼，但現在已經忘記了是哪位博主了，若該博主能看到這篇博文，請與我聯絡，我新增上相關引用說明，非常感謝該博主的程式碼給了我很大幫助。