window下使用tcp传输视频（c++）

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参考链接：

tcp传输普通文本

网络编程：基于TCP的socket网络传输视频（C++, python）

由于项目要求，需要使用tcp完成视频的传输，udp其实也可以，但是udp不可靠，怕丢帧。
菜鸟一个，边缝边写，希望抛砖引玉，大家有意见可以评论区见。哈哈哈！
tcp相关内容不再赘述，本人也是半吊子，会用，远离之前学过，有点忘记了。干货开始：
vs完整工程文件（包括代码和可执行文件）：
文件较大，建议csdn下载
csdn：0积分下载，无需梯子
github：需要梯子，文件超过100m了，只上传了源码

整体思路

1. 对于视频文件读入之后按帧传输，每一帧传输之前使用opencv进行压缩（接收端接收到数据之后也需要解压缩）。
2. 在传输压缩后的图像数据之前，先传输视频的总帧数和单帧压缩后数组的长度，从而帮助接收端进行解码。
3. 服务器端和客户端都可实现收发操作。

环境配置

win10
opencv4.5.1
c++ 11
vs2019

---

废话不多说，直接上代码：

服务器端：

server.h

#pragma once
#include<iostream>
#include<winsock.h>
#include <string>
#pragma comment(lib,"ws2_32.lib")
#include "myopencv.h"
using namespace std;


class Server {
public:
	int m_port; //端口号
	//定义服务端套接字，接受请求套接字
	SOCKET m_server;
	SOCKET m_accept;
	VideoCapture m_cap;
	vector<Mat> m_file_in;
	vector<Mat> m_file_out;
	string m_send_buf;
	string m_recv_buf;

	bool initialization(const int& port, const VideoCapture& cap); // 初始化
	bool build_connect();
	bool send_data();
	bool receive_data();
	bool free_connect();
};

server.cpp

#include "server.h"
#define SIZE 100

bool Server::initialization(const int& port, const VideoCapture& cap) {
	m_port = port;
	m_cap = cap;

	// 初始化库（windows独有）
	//初始化套接字库
	WORD w_req = MAKEWORD(2, 2);//版本号
	WSADATA wsadata;
	int err;
	err = WSAStartup(w_req, &wsadata);
	if (err != 0) {
		cout << "初始化套接字库失败！" << endl;
		return false;
	}
	else {
		cout << "初始化套接字库成功！" << endl;
	}

	//检测版本号
	if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wHighVersion) != 2) {
		cout << "套接字库版本号不符！" << endl;
		WSACleanup();
		return false;
	}
	else {
		cout << "套接字库版本正确！" << endl;
	}

	return true;
}

bool Server::build_connect() {
	//服务端地址客户端地址
	SOCKADDR_IN server_addr;
	SOCKADDR_IN accept_addr;

	//填充服务端信息
	server_addr.sin_family = AF_INET;  // 用来定义那种地址族，AF_INET：IPV4
	server_addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);  // 保存ip地址，htonl将一个无符号长整型转换为TCP/IP协议网络的大端
	// INADDR_ANY表示一个服务器上的所有网卡
	server_addr.sin_port = htons(m_port);  // 端口号

	//创建套接字
	m_server = socket(AF_INET, SOCK_STREAM, 0);  // 使用tcp进行连接

	if (::bind(m_server, (SOCKADDR*)&server_addr, sizeof(SOCKADDR)) == SOCKET_ERROR) {
		cout << "套接字绑定失败！" << endl;
		WSACleanup();
		return false;
	}
	else {
		cout << "套接字绑定成功！" << endl;
	}

	//设置套接字为监听状态
	if (listen(m_server, SOMAXCONN) < 0) {
		cout << "设置监听状态失败！" << endl;
		WSACleanup();
		return false;
	}
	else {
		cout << "设置监听状态成功！" << endl;
	}
	cout << "服务端正在监听连接，请稍候...." << endl;
	//接受连接请求
	int len = sizeof(SOCKADDR);
	m_accept = accept(m_server, (SOCKADDR*)&accept_addr, &len);
	if (m_accept == SOCKET_ERROR) {
		cout << "连接失败！" << endl;
		WSACleanup();
		return false;
	}
	cout << "连接建立，准备接受数据" << endl;
	return true;
}

bool Server::send_data() {
	Mat frame;
	vector<uchar> data_encode;
	std::vector<int> params;  // 压缩参数
	params.resize(3, 0);
	params[0] = IMWRITE_JPEG_QUALITY; // 无损压缩
	params[1] = 100;
	char frames_cnt[10] = { 0, };
	_itoa_s(int(m_cap.get(CAP_PROP_FRAME_COUNT)), frames_cnt, 10);
	send(m_accept, frames_cnt, 10, 0);
	cout << "开始发送" << endl;
	int j = 0;
	while (m_cap.read(frame)) {

		m_file_in.push_back(frame.clone());
		imencode(".jpg", frame, data_encode, params);  // 对图像进行压缩
		int len_encoder = data_encode.size();

		_itoa_s(len_encoder, frames_cnt, 10);
		send(m_accept, frames_cnt, 10, 0);

		_itoa_s(SIZE, frames_cnt, 10);
		send(m_accept, frames_cnt, 10, 0);
		// 发送
		char send_char[SIZE] = { 0, };
		int index = 0;
		bool flag = false;
		for (int i = 0; i < len_encoder / SIZE + 1; ++i) {
			for (int k = 0; k < SIZE; ++k) {
				if (index >= data_encode.size()) {
					flag = true;
					break;
				}
				send_char[k] = data_encode[index++];
			}
			send(m_accept, send_char, SIZE, 0);
		}

		//m_send_buf = to_string(j + 1);
		//send(m_server, m_send_buf.c_str(), strlen(frames_cnt.c_str()), 0);
		//waitKey(25);
		//imshow("input", frame);
		data_encode.clear();
		++j;
		cout << j << endl;  // 发送端一直在发送
	}
	cout << "发送完成";
	return true;
}

bool Server::receive_data() {
	Mat frame;
	vector<uchar> data_decode;
	std::vector<int> params;  // 压缩参数
	char recv_char[100];

	params.resize(3, 0);
	params[0] = IMWRITE_JPEG_QUALITY; // 无损压缩
	params[1] = 100;

	char frams_cnt[10] = { 0, };
	recv(m_accept, frams_cnt, 10, 0);
	// 解析总帧数
	int count = atoi(frams_cnt);
	for (unsigned int i = 0; i < count; ++i) {
		recv(m_accept, frams_cnt, 10, 0);
		// 解析总帧数
		int cnt = atoi(frams_cnt);
		recv(m_accept, frams_cnt, 10, 0);
		int size = atoi(frams_cnt);

		data_decode.resize(cnt);
		int index = 0;
		bool flag = true;
		for (int i = 0; i < cnt / size + 1; ++i) {
			recv(m_accept, recv_char, size, 0);
			for (int k = 0; k < size; ++k) {
				if (index >= cnt) {
					flag = true;
					break;
				}
				data_decode[index++] = recv_char[k];
			}
		}

		//data_decode.pop_back();
		frame = imdecode(data_decode, IMREAD_COLOR);
		m_file_out.push_back(frame.clone());
		//waitKey(25);
		//imshow("s", frame);
		//char recv_buf[50];
		//recv(m_accept, recv_char, 50, 0);
		//cout << "客户端信息:" << recv_buf << endl;
		data_decode.clear();
	}
	cout << "接受完成";
	return true;
}

bool Server::free_connect() {
	m_cap.release();
	//关闭套接字
	closesocket(m_server);
	closesocket(m_accept);
	//释放DLL资源
	WSACleanup();
	return true;
}

客户端

client.h

#pragma once
#include<iostream>
#include<winsock.h>
#include <string>
#pragma comment(lib,"ws2_32.lib")
#include "myopencv.h"
using namespace std;


class Server {
public:
	int m_port; //端口号
	string m_ip; //服务端ip地址
	//定义服务端套接字，接受请求套接字
	SOCKET m_server;
	VideoCapture m_cap;
	vector<Mat> m_file_in;
	vector<Mat> m_file_out;
	//定义发送缓冲区和接受缓冲区
	string m_send_buf;
	string m_recv_buf;

	bool initialization(const int& port, const string& ip, const VideoCapture& cap); // 初始化
	bool build_connect();
	bool send_data();
	bool receive_data();
	bool free_connect();
};

client.cpp

#include "client.h"
#define SIZE 100
bool Server::initialization(const int& port, const string& ip, const VideoCapture& cap) {
	m_port = port;
	m_cap = cap;
	m_ip = ip;
	// 初始化库（windows独有）
	//初始化套接字库
	WORD w_req = MAKEWORD(2, 2);//版本号
	WSADATA wsadata;
	int err;
	err = WSAStartup(w_req, &wsadata);
	if (err != 0) {
		cout << "初始化套接字库失败！" << endl;
		return false;
	}
	else {
		cout << "初始化套接字库成功！" << endl;
	}

	//检测版本号
	if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wHighVersion) != 2) {
		cout << "套接字库版本号不符！" << endl;
		WSACleanup();
		return false;
	}
	else {
		cout << "套接字库版本正确！" << endl;
	}

	return true;
}

bool Server::build_connect() {
	//服务端地址客户端地址
	SOCKADDR_IN server_addr;
	SOCKADDR_IN accept_addr;

	//填充服务端信息
	server_addr.sin_family = AF_INET;  // 用来定义那种地址族，AF_INET：IPV4
	server_addr.sin_addr.S_un.S_addr = inet_addr(m_ip.c_str());  // 保存ip地址，htonl将一个无符号长整型转换为TCP/IP协议网络的大端
	// INADDR_ANY表示一个服务器上的所有网卡
	server_addr.sin_port = htons(m_port);  // 端口号

	//创建套接字
	m_server = socket(AF_INET, SOCK_STREAM, 0);
	if (connect(m_server, (SOCKADDR*)&server_addr, sizeof(SOCKADDR)) == SOCKET_ERROR) {
		cout << "服务器连接失败！" << endl;
		WSACleanup();
		return false;
	}
	else {
		cout << "服务器连接成功！" << endl;
	}

	return true;
}

bool Server::send_data() {
	Mat frame;
	vector<uchar> data_encode;
	std::vector<int> params;  // 压缩参数
	params.resize(3, 0);
	params[0] = IMWRITE_JPEG_QUALITY; // 无损压缩
	params[1] = 100;
	char frames_cnt[10] = { 0, };
	_itoa_s(int(m_cap.get(CAP_PROP_FRAME_COUNT)), frames_cnt, 10);
	send(m_server, frames_cnt, 10, 0);
	cout << "开始发送" << endl;
	int j = 0;
	while (m_cap.read(frame)) {

		m_file_in.push_back(frame.clone());
		imencode(".jpg", frame, data_encode, params);  // 对图像进行压缩
		int len_encoder = data_encode.size();

		_itoa_s(len_encoder, frames_cnt, 10);
		send(m_server, frames_cnt, 10, 0);

		_itoa_s(SIZE, frames_cnt, 10);
		send(m_server, frames_cnt, 10, 0);
		// 发送
		char send_char[SIZE] = { 0, };
		int index = 0;
		bool flag = false;
		for (int i = 0; i < len_encoder / SIZE + 1; ++i) {
			for (int k = 0; k < SIZE; ++k) {
				if (index >= data_encode.size()) {
					flag = true;
					break;
				}
				send_char[k] = data_encode[index++];
			}
			send(m_server, send_char, SIZE, 0);
		}

		//m_send_buf = to_string(j + 1);
		//send(m_server, m_send_buf.c_str(), strlen(frames_cnt.c_str()), 0);
		//waitKey(25);
		//imshow("input", frame);
		data_encode.clear();
		++j;
		cout << j << endl;  // 发送端一直在发送
	}
	cout << "发送完成";
	return true;
}

bool Server::receive_data() {
	Mat frame;
	vector<uchar> data_decode;
	std::vector<int> params;  // 压缩参数
	char recv_char[100];

	params.resize(3, 0);
	params[0] = IMWRITE_JPEG_QUALITY; // 无损压缩
	params[1] = 100;

	char frams_cnt[10] = { 0, };
	recv(m_server, frams_cnt, 10, 0);
	// 解析总帧数
	int count = atoi(frams_cnt);
	for (unsigned int i = 0; i < count; ++i) {
		recv(m_server, frams_cnt, 10, 0);
		// 解析总帧数
		int cnt = atoi(frams_cnt);
		recv(m_server, frams_cnt, 10, 0);
		int size = atoi(frams_cnt);

		data_decode.resize(cnt);
		int index = 0;
		bool flag = true;
		for (int i = 0; i < cnt / size + 1; ++i) {
			recv(m_server, recv_char, size, 0);
			for (int k = 0; k < size; ++k) {
				if (index >= cnt) {
					flag = true;
					break;
				}
				data_decode[index++] = recv_char[k];
			}
		}

		//data_decode.pop_back();
		frame = imdecode(data_decode, IMREAD_COLOR);
		m_file_out.push_back(frame.clone());
		//waitKey(25);
		//imshow("s", frame);
		//char recv_buf[50];
		//recv(m_accept, recv_char, 50, 0);
		//cout << "客户端信息:" << recv_buf << endl;
		data_decode.clear();
	}
	cout << "接受完成";
	return true;
}

bool Server::free_connect() {
	m_cap.release();
	//关闭套接字
	closesocket(m_server);
	//释放DLL资源
	WSACleanup();
	return true;
}