c语言实现udp协议的视频传输代码
时间: 2023-08-06 12:16:24 浏览: 71
以下是一个简单的使用C语言实现UDP协议视频传输的代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#define BUF_SIZE 2048
#define PORT 8888
int main(int argc, char *argv[])
{
int sock;
char buffer[BUF_SIZE];
struct sockaddr_in serv_addr, clnt_addr;
socklen_t clnt_addr_size;
FILE *fp;
long file_size, remain_size, send_size;
int read_size, send_len;
int total_send = 0;
// 创建UDP套接字
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
{
perror("socket error");
exit(1);
}
// 设置套接字地址和端口
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(PORT);
if (bind(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
{
perror("bind error");
exit(1);
}
// 接收视频数据
clnt_addr_size = sizeof(clnt_addr);
if ((fp = fopen("video.mp4", "wb")) == NULL)
{
perror("fopen error");
exit(1);
}
printf("Start receiving video...\n");
recvfrom(sock, buffer, BUF_SIZE, 0, (struct sockaddr *)&clnt_addr, &clnt_addr_size);
memcpy(&file_size, buffer, sizeof(file_size));
printf("Video size: %ld bytes\n", file_size);
remain_size = file_size;
while (remain_size > 0)
{
read_size = recvfrom(sock, buffer, BUF_SIZE, 0, (struct sockaddr *)&clnt_addr, &clnt_addr_size);
if (read_size < 0)
{
perror("recvfrom error");
exit(1);
}
fwrite(buffer, sizeof(char), read_size, fp);
remain_size -= read_size;
total_send += read_size;
if (total_send >= 1024 * 1024)
{
printf("Received %d bytes\n", total_send);
total_send = 0;
}
}
printf("Video received successfully!\n");
// 发送确认信息
send_len = sprintf(buffer, "Video received successfully!");
if (sendto(sock, buffer, send_len, 0, (struct sockaddr *)&clnt_addr, clnt_addr_size) < 0)
{
perror("sendto error");
exit(1);
}
// 关闭套接字和文件
fclose(fp);
close(sock);
return 0;
}
```
这个例子中,我们创建了一个UDP套接字,绑定到8888端口上,并使用recvfrom()函数接收客户端发送的视频数据。视频数据的大小存储在第一帧数据中,用于计算剩余数据的大小。然后,我们使用fwrite()函数将接收到的数据写入文件中,并使用sendto()函数向客户端发送确认信息,告知客户端视频数据已成功接收。最后,我们关闭套接字和文件。