V4L2采集视频利用TCP协议远程传输
开发环境
system : ubuntu12.04
board : mini2440
arm-linux-gcc : v4.3.2
说明:该应用将V4L2视频采集和TCP网络传输结合起来,实现了实时视频传输,分为客户端client和服务器端server两部分,客服端采集视频并进行传输,服务器穿接收视频并保存成文件。 客户端编译了arm版本和x86版本,均测试正常。
本程序仅做学习用~~~~~~~~~~
1. v4l2_tcp_server.c
点击(此处)折叠或打开
- #include <stdio.h>
- #include <string.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
-
- #define MAXLINE 1024
- #define SERVER_PORT 3333
-
- void usage(char *command)
- {
- printf("usage :%s filename\n", command);
- exit(0);
- }
- int main(int argc,char **argv)
- {
- struct sockaddr_in serv_addr;
- struct sockaddr_in clie_addr;
- char buf[MAXLINE];
- int sock_id;
- int link_id;
- int recv_len;
- int write_leng;
- int clie_addr_len;
- FILE *fp;
-
- if (argc != 2) {
- usage(argv[0]);
- }
- if ((fp = fopen(argv[1], "w")) == NULL) {
- perror("Open file failed\n");
- exit(0);
- }
- if ((sock_id = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
- perror("Create socket failed\n");
- exit(0);
- }
- //memset(&serv_addr, 0, sizeof(serv_addr));
- bzero(&serv_addr,sizeof(serv_addr));
- serv_addr.sin_family = AF_INET; //IPv4
- serv_addr.sin_port = htons(SERVER_PORT);
- serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
-
- if (bind(sock_id, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0 ) {
- perror("Bind socket failed\n");
- exit(0);
- }
-
- if (-1 == listen(sock_id, 10)) {
- perror("Listen socket failed\n");
- exit(0);
- }
- while (1) {
- clie_addr_len = sizeof(clie_addr);
- link_id = accept(sock_id, (struct sockaddr *)&clie_addr, (socklen_t *)&clie_addr_len);
- if (-1 == link_id) {
- perror("Accept socket failed\n");
- exit(0);
- }
- bzero(buf, MAXLINE);
- while ((recv_len = recv(link_id, buf, MAXLINE, 0)) != 0) {
- if(recv_len < 0) {
- printf("Recieve Data From Server Failed!\n");
- break;
- }
- printf("#");
- write_leng = fwrite(buf, sizeof(char), recv_len, fp);
- if (write_leng < recv_len) {
- printf("Write file failed\n");
- break;
- }
- bzero(buf,MAXLINE);
- }
- printf("\nFinish Recieve\n");
- fclose(fp);
- close(link_id);
- }
- close(sock_id);
- return 0;
- }
点击(此处)折叠或打开
- all:v4l2_tcp_server
- v4l2_tcp_server:v4l2_tcp_server.c
- gcc -Wall -o $@ $<
- clean:
- rm -rf v4l2_tcp_server *.yuv
点击(此处)折叠或打开
- /*
- * V4L2 video capture and tcp transformation example
- * AUTHOT : WANGTISHENG
- * DATA : 2013-12-18
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <assert.h>
- #include <getopt.h> /* getopt_long() */
- #include <fcntl.h> /* low-level i/o */
- #include <unistd.h>
- #include <errno.h>
- #include <sys/stat.h>
- #include <sys/types.h>
- #include <sys/time.h>
- #include <sys/mman.h>
- #include <sys/ioctl.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <linux/videodev2.h>
- #define CLEAR(x) memset(&(x), 0, sizeof(x))
- struct buffer {
- void *start;
- size_t length;
- };
- static char *dev_name;
- static int fd = -1; //DEVICE NUMBER
- struct buffer *buffers;
- static unsigned int n_buffers;
- static int frame_count = 100;
- FILE *fp; //FILE POINTOR
- #define CAPTURE_FILE "./frame_test.yuv"
- /* variables and macros for socket */
- int sock_id;
- #define SERVER_IP "192.168.1.121"
- #define CLIENT_PORT 3333
- #define MAXLINE 1024
- char buf[MAXLINE];
- static void errno_exit(const char *s)
- {
- fprintf(stderr, "%s error %d, %s\n", s, errno, strerror(errno));
- exit(EXIT_FAILURE);
- }
- static int xioctl(int fh, int request, void *arg)
- {
- int r;
- do {
- r = ioctl(fh, request, arg);
- } while (-1 == r && EINTR == errno);
- return r;
- }
- //处理函数
- static void process_image(const void *p, int size)
- {
- int read_len;
- FILE *fp_tmp;
- int send_len;
-
- fp_tmp = fopen(CAPTURE_FILE,"w");
- fwrite(p,size, 1, fp_tmp);
- fclose(fp_tmp);
- //fwrite(p,size, 1, fp);
- //memset(buf,0,MAXLINE);
- fp_tmp = fopen(CAPTURE_FILE,"r");
- while ((read_len = fread(buf, sizeof(char), MAXLINE, fp_tmp)) >0 ) {
- send_len = send(sock_id, buf, read_len, 0);
- if ( send_len < 0 ) {
- perror("Send file failed\n");
- exit(0);
- }
- //bzero(buf, MAXLINE); //no use
- }
- fclose(fp_tmp);
- }
- static int read_frame(FILE *fp)
- {
- struct v4l2_buffer buf;
- CLEAR(buf);
- buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf.memory = V4L2_MEMORY_MMAP;
-
- if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf))
- errno_exit("VIDIOC_DQBUF");
-
- process_image(buffers[buf.index].start, buf.bytesused);
- if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
- errno_exit("VIDIOC_QBUF");
- return 1;
- }
- static void mainloop(void)
- {
- unsigned int count;
- count = frame_count;
- while (count-- > 0) {
- printf("No.%d\n",frame_count - count); //显示当前帧数目
- read_frame(fp);
- }
-
- printf("\nREAD AND SAVE DONE!\n");
- }
- static void stop_capturing(void)
- {
- enum v4l2_buf_type type;
- type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- if (-1 == xioctl(fd, VIDIOC_STREAMOFF, &type))
- errno_exit("VIDIOC_STREAMOFF");
- }
- static void start_capturing(void)
- {
- unsigned int i;
- enum v4l2_buf_type type;
- for (i = 0; i < n_buffers; ++i) {
- struct v4l2_buffer buf;
- CLEAR(buf);
- buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf.memory = V4L2_MEMORY_MMAP;
- buf.index = i;
- if (-1 == xioctl(fd, VIDIOC_QBUF, &buf))
- errno_exit("VIDIOC_QBUF");
- }
- type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- if (-1 == xioctl(fd, VIDIOC_STREAMON, &type))
- errno_exit("VIDIOC_STREAMON");
- }
- static void uninit_device(void)
- {
- unsigned int i;
- for (i = 0; i < n_buffers; ++i)
- if (-1 == munmap(buffers[i].start, buffers[i].length))
- errno_exit("munmap");
- free(buffers);
- }
- static void init_mmap(void)
- {
- struct v4l2_requestbuffers req;
- CLEAR(req);
- req.count = 4;
- req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- req.memory = V4L2_MEMORY_MMAP;
- if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) {
- if (EINVAL == errno) {
- fprintf(stderr, "%s does not support "
- "memory mapping\n", dev_name);
- exit(EXIT_FAILURE);
- } else {
- errno_exit("VIDIOC_REQBUFS");
- }
- }
- if (req.count < 2) {
- fprintf(stderr, "Insufficient buffer memory on %s\n",
- dev_name);
- exit(EXIT_FAILURE);
- }
- buffers = calloc(req.count, sizeof(*buffers));
- if (!buffers) {
- fprintf(stderr, "Out of memory\n");
- exit(EXIT_FAILURE);
- }
- for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
- struct v4l2_buffer buf;
- CLEAR(buf);
- buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf.memory = V4L2_MEMORY_MMAP;
- buf.index = n_buffers;
- if (-1 == xioctl(fd, VIDIOC_QUERYBUF, &buf))
- errno_exit("VIDIOC_QUERYBUF");
- buffers[n_buffers].length = buf.length;
- buffers[n_buffers].start =
- mmap(NULL /* start anywhere */,
- buf.length,
- PROT_READ | PROT_WRITE /* required */,
- MAP_SHARED /* recommended */,
- fd, buf.m.offset);
- if (MAP_FAILED == buffers[n_buffers].start)
- errno_exit("mmap");
- }
- }
- static void init_device(void)
- {
- struct v4l2_capability cap;
- struct v4l2_format fmt;
- if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &cap)) { //测试参数
- if (EINVAL == errno) {
- fprintf(stderr, "%s is no V4L2 device\n",
- dev_name);
- exit(EXIT_FAILURE);
- } else {
- errno_exit("VIDIOC_QUERYCAP");
- }
- }
- if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
- fprintf(stderr, "%s is no video capture device\n",
- dev_name);
- exit(EXIT_FAILURE);
- }
- if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
- fprintf(stderr, "%s does not support streaming i/o\n",
- dev_name);
- exit(EXIT_FAILURE);
- }
- CLEAR(fmt);
- fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- fmt.fmt.pix.width = 320;
- fmt.fmt.pix.height = 240;
- fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
- fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
- if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt)) //设置格式
- errno_exit("VIDIOC_S_FMT");
- init_mmap();
- }
- static void close_device(void)
- {
- if (-1 == close(fd))
- errno_exit("close");
- fd = -1;
- }
- static void open_device(void)
- {
- //加上O_NONBLOCK会出现如下错误
- //VIDIOC_DQBUF error 11, Resource temporarily unavailable
- fd = open(dev_name, O_RDWR /* required */ /*| O_NONBLOCK*/, 0);
- if (-1 == fd) {
- fprintf(stderr, "Cannot open '%s': %d, %s\n",
- dev_name, errno, strerror(errno));
- exit(EXIT_FAILURE);
- }
- }
- /* tcp initinalization */
- int tcp_init(void)
- {
- struct sockaddr_in serv_addr;
- int i_ret;
- //sock_id = socket(AF_INET, SOCK_DGRAM, 0);
- if ((sock_id = socket(AF_INET,SOCK_STREAM,0)) < 0) {
- perror("Create socket failed\n");
- exit(0);
- }
- memset(&serv_addr, 0, sizeof(serv_addr));
- serv_addr.sin_family = AF_INET;
- serv_addr.sin_port = htons(CLIENT_PORT);
- serv_addr.sin_addr.s_addr=inet_addr(SERVER_IP);
-
- /* connect the server commented by guoqingbo*/
- i_ret = connect(sock_id, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr));
- if (-1 == i_ret) {
- printf("Connect socket failed\n");
- return -1;
- }
- printf("Socket connected!\n");
- return 0;
- }
- int main(int argc, char **argv)
- {
- dev_name = "/dev/video0";
-
- //if(argc != 1)
- //{
- // printf("usage :%s filename\n", argv[0]);
- // exit(0);
- //}
- //if ((fp = fopen(argv[1], "w")) == NULL) {
- // perror("Creat file failed");
- // exit(0);
- //}
- tcp_init();
- open_device();
- init_device();
- start_capturing();
- mainloop(); //主要处理均在该函数中实现
- //fclose(fp);
- stop_capturing();
- uninit_device();
- close_device();
- //fprintf(stderr, "\n");
- return 0;
- }
点击(此处)折叠或打开
- all:v4l2_tcp_client_x86 v4l2_tcp_client_arm
- v4l2_tcp_client_x86:v4l2_tcp_client.c
- gcc -Wall -o $@ $<
- v4l2_tcp_client_arm:v4l2_tcp_client.c
- arm-linux-gcc -Wall -o $@ $<
- clean:
- rm -rf v4l2_tcp_client_x86 v4l2_tcp_client_arm
先执行服务器端程序
# ./v4l2_tcp_server file_receive.yuv
执行客户端程序
# ./v4l2_tcp_client_x86 或者
# ./v4l2_tcp_client_arm