udp_video_client.cpp
#include "stdafx.h"
#include "opencv2/opencv.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include
#include
#pragma comment(lib,"ws2_32.lib")
#pragma comment(lib,"opencv_world340.lib")
int _tmain(int argc, _TCHAR* argv[])
{
WSADATA WSAData;
WORD sockVersion = MAKEWORD(2, 2);
if (WSAStartup(sockVersion, &WSAData) != 0)
return 0;
SOCKET clientSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (INVALID_SOCKET == clientSocket)
{
std::cout << "socket error!";
return 0;
}
/* socket IP和端口绑定*/
sockaddr_in dstAddr;
dstAddr.sin_family = AF_INET;
dstAddr.sin_port = htons(8888);
dstAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
cv::VideoCapture capture(0);//打开摄像头
cv::Mat image;
//摄像头读取的图像后续会进行压缩 这里进行压缩相关配置
std::vector quality;
quality.push_back(CV_IMWRITE_JPEG_QUALITY);
quality.push_back(30);//进行50%的压缩
std::vector data_encode;
while (true)
{
capture >> image;//循环读取摄像头的每一帧
imencode(".jpg", image, data_encode, quality);//将图像编码
int nSize = data_encode.size();
unsigned char *encodeImg = new unsigned char[nSize];
for (int i = 0; i < nSize; i++) { encodeImg[i] = data_encode[i]; }
//将unsigned char * 指针变量转化为const char * 指针变量 方便进行sendto函数调用
const char* p = (const char*)(char*)encodeImg;
sendto(clientSocket, p, nSize, 0, (const sockaddr*)& dstAddr, sizeof(dstAddr));
}
closesocket(clientSocket);
WSACleanup();
capture.release();
return 0;
}
udp_video_serv.cpp
#include "stdafx.h"
#include
#include
#include
#include "opencv2/opencv.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#pragma comment(lib,"opencv_world340.lib")
#pragma comment(lib,"ws2_32.lib")
int _tmain(int argc, _TCHAR* argv[])
{
//初始化socket资源
WSADATA WSAData;
WORD sockVersion = MAKEWORD(2, 2);
if (WSAStartup(sockVersion, &WSAData) != 0)
return 0;
SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); //创建服务器socket
if (INVALID_SOCKET == serSocket)
{
std::cout << "socket error!";
return 0;
}
//设置传输协议、端口以及目的地址
sockaddr_in serAddr;
serAddr.sin_family = AF_INET;
serAddr.sin_port = htons(8888);
serAddr.sin_addr.S_un.S_addr = INADDR_ANY;
if (bind(serSocket, (sockaddr*)&serAddr, sizeof(serAddr)) == SOCKET_ERROR) //将socket绑定地址
{
std::cout << "bind error";
closesocket(serSocket);
return 0;
}
sockaddr_in clientAddr;
int iAddrlen = sizeof(clientAddr);
char buff[14400]; //建立接收缓存字节数组 这里设置大一点 数组长度值是根据经验取的
std::vector decode;
cv::namedWindow("image", cv::WINDOW_NORMAL);
while (true)
{
memset(buff, 0, sizeof(buff)); //清空接收缓存数组
//开始接收数据
int len = recvfrom(serSocket, buff, sizeof(buff), 0, (sockaddr*)&clientAddr, &iAddrlen); //len表示当前一次性接收的数据长度
int pos = 0;
while (pos < len) { decode.push_back(buff[pos++]); }//存入vector
//decode.push_back(0);
cv::Mat image = cv::imdecode(decode, CV_LOAD_IMAGE_COLOR);//图像解码
cv::imshow("image", image);
cv::waitKey(1);
decode.clear();
}
closesocket(serSocket); //关闭socket
WSACleanup();
return 0;
}
服务端代码中,图像字节大小如果超过接收缓存字节数组buff大小,会导致udp数据接收失败,这时,可以适当增加数组大小
实际运行时,客户端和服务器端没有先后顺序,这也就是udp通信的一个特点,无需建立连接
代码在windows10 平台下验证通过。
程序运行时,在服务器端可以看到客户端上传的视频图像,无线局域网延迟约为1s。