由usb摄像头驱动,h264编码库,采集read_video,传输,客户端显示组成读取摄像头数据缓冲区是否有帧数据收到，有数据收到就读取数据并进行H264编码，把数据发送到socket发送到客户端。配置内核:make menuconfig ARCH=arm, 选择gerneral setup-->multimedia devices-->device drivers-->multimedia devices-->video capture adapters-->V4L USB devices-->USB OV511 camera support编译内核：make uImage ARCH=armCROSS_COMPILE=arm-linux-将uImage拷贝到tftpboot目录下编译t264编译server_arm挂载文件系统连接usb摄像头, 节点自动创建起来，ls -l /dev/video0, mknod /dev/video0 c 81 0在ARM上运行视频采集和发送程序./server_arm fastspeed.txt在PC端打开客户端LinuxClient.exe, 看到视频信息。
主要程序充server_arm.c/* 服务端程序 server.c */ //WB#include <unistd.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <stdio.h>#include <sys/ioctl.h>#include <sys/mman.h>#include <stdlib.h>#include <linux/types.h>#include <linux/videodev.h>#include <setjmp.h>#include <string.h>#include <signal.h>#include <errno.h>#include <sys/socket.h> #include <netinet/in.h>#include "convert.h"#include "../avc-src-0.14/avc/common/T264.h"#define SERVER_PORT 8888  T264_t* m_t264;T264_param_t m_param;char* m_pSrc;char* m_pDst;int* m_lDstSize;char* m_pPoolData;#define USB_VIDEO "/dev/video0"int cam_fd;struct video_mmap cam_mm;/*视频内存映射*//*包含摄像头的基本信息，例如设备名称、支持的最大最小分辨率、信号源信息等*/struct video_capability cam_cap;/*亮度、对比度等和voide_mmap中的分辨率*/struct video_picture cam_pic;struct video_mbuf cam_mbuf;/*摄像头存储缓冲区的帧信息*/struct video_window win;/* 设备采集窗口参数*/char *cam_data =http://www.mamicode.com/ NULL;int nframe;void read_video(char *pixels,int w, int h){  int ret;  int frame=0;   cam_mm.width = w;  cam_mm.height = h; /* 对于单帧采集只需设置 frame=0*/  cam_mm.frame = 0;  cam_mm.format=VIDEO_PALETTE_YUV420P; //change by 091215/*  若调用成功，则激活设备真正开始一帧图像的截取，是非阻塞的*/  ret = ioctl(cam_fd,VIDIOCMCAPTURE,&cam_mm);  if( ret<0 ) {    printf("ERROR: VIDIOCMCAPTURE\n");  }/*  函数判断该帧图像是否截取完毕，成功返回表示截取完毕*/  ret = ioctl(cam_fd,VIDIOCSYNC,&frame);  if( ret<0 ) {    printf("ERROR: VIDIOCSYNC\n");  }}void config_vid_pic(){  char cfpath[100];  FILE *cf;  int ret;  if (ioctl(cam_fd, VIDIOCGPICT, &cam_pic) < 0) {    printf("ERROR:VIDIOCGPICT\n");  }  /*图像采集格式,网眼V2000只支持VIDEO_PALETTE_YUV420P*/  cam_pic.palette = VIDEO_PALETTE_YUV420P; //change by 091215#if 0    cam_pic.brightness  = 30464;    cam_pic.hue = 36000;    cam_pic.colour = 0;    cam_pic.contrast = 43312;    cam_pic.whiteness = 10312;    cam_pic.depth =         24;#endif    cam_pic.brightness  =    30464;    cam_pic.hue =        111;    cam_pic.colour =        555;    cam_pic.contrast =        43312;    cam_pic.whiteness =        111;    /*VIDEO_PALETTE_YUV420,bpp=12bit*/    cam_pic.depth =         12; //bpp == bytes per pixel,change by 091215    /*设置摄像头缓冲中voideo_picture信息*/    ret = ioctl( cam_fd, VIDIOCSPICT,&cam_pic );          if( ret<0 ) {      close(cam_fd);      printf("ERROR: VIDIOCSPICT,Can‘t set video_picture format\n");    }    return;}void init_video(int w,int h) /* bpp == bytes per pixel*/{  int ret;    /*设备的打开*/  cam_fd = open( USB_VIDEO, O_RDWR );  if( cam_fd<0 )    printf("Can‘t open video device\n");    /* 使用IOCTL命令VIDIOCGCAP，获取摄像头的基本信息，如最大，最小分辨率*/    ret = ioctl( cam_fd,VIDIOCGCAP,&cam_cap );       /* 摄像头的基本信息*/  if( ret<0 ) {    printf("Can‘t get device information: VIDIOCGCAP\n");  }  printf("Device name:%s\nWidth:%d ~ %d\nHeight:%d ~ %d\n",cam_cap.name, cam_cap.maxwidth, cam_cap.minwidth, cam_cap.maxheight, cam_cap.minheight);  if( ioctl(cam_fd,VIDIOCGWIN,&win)<0 ) {    printf("ERROR:VIDIOCGWIN\n");  }  win.x = 0;  //windows中的原点坐标  win.y = 0;  //windows中的原点坐标  win.width=w; //capture area 宽度  win.height=h; //capture area 高度    /*使用IOCTL命令VIDIOCSWIN，设置摄像头的基本信息*/  if (ioctl(cam_fd, VIDIOCSWIN, &win) < 0) {    printf("ERROR:VIDIOCSWIN\n");  }    /*设置摄像头voideo_picture信息*/  config_vid_pic();       /*使用IOCTL命令VIDIOCGCAP，获取获得摄像头存储缓冲区的帧信息*/  ret = ioctl(cam_fd,VIDIOCGMBUF,&cam_mbuf);  if( ret<0 ) {    printf("ERROR:VIDIOCGMBUF,Can‘t get video_mbuf\n");  }  printf("Frames:%d\n",cam_mbuf.frames);  nframe = cam_mbuf.frames;    /*接着把摄像头对应的设备文件映射到内存区*/  cam_data = (char*)mmap(0, cam_mbuf.size, PROT_READ|PROT_WRITE,MAP_SHARED,cam_fd,0);   if( cam_data =http://www.mamicode.com/= MAP_FAILED ) {    printf("ERROR:mmap\n");  }  printf("Buffer size:%d\nOffset:%d\n",cam_mbuf.size,cam_mbuf.offsets[0]);  InitLookupTable();  }void init_param(T264_param_t* param, const char* file){    int total_no;    FILE* fd;     char line[255];    int32_t b;    if (!(fd = fopen(file,"r")))    {        printf("Couldn‘t open parameter file %s.\n", file);        exit(-1);    }    memset(param, 0, sizeof(*param));    fgets(line, 254, fd); sscanf(line,"%d", &b);    if (b != 4)    {        printf("wrong param file version, expect v4.0\n");        exit(-1);    }    fgets(line, 254, fd); sscanf(line,"%d", &param->width);    fgets(line, 254, fd); sscanf(line,"%d", &param->height);    fgets(line, 254, fd); sscanf(line,"%d", &param->search_x);    fgets(line, 254, fd); sscanf(line,"%d", &param->search_y);    fgets(line, 254, fd); sscanf(line,"%d", &total_no);    fgets(line, 254, fd); sscanf(line,"%d", &param->iframe);    fgets(line, 254, fd); sscanf(line,"%d", &param->idrframe);    fgets(line, 254, fd); sscanf(line,"%d", &param->b_num);    fgets(line, 254, fd); sscanf(line,"%d", &param->ref_num);    fgets(line, 254, fd); sscanf(line,"%d", &param->enable_rc);    fgets(line, 254, fd); sscanf(line,"%d", &param->bitrate);    fgets(line, 254, fd); sscanf(line,"%f", &param->framerate);    fgets(line, 254, fd); sscanf(line,"%d", &param->qp);    fgets(line, 254, fd); sscanf(line,"%d", &param->min_qp);    fgets(line, 254, fd); sscanf(line,"%d", &param->max_qp);    fgets(line, 254, fd); sscanf(line,"%d", &param->enable_stat);    fgets(line, 254, fd); sscanf(line,"%d", &param->disable_filter);    fgets(line, 254, fd); sscanf(line,"%d", &param->aspect_ratio);    fgets(line, 254, fd); sscanf(line,"%d", &param->video_format);    fgets(line, 254, fd); sscanf(line,"%d", &param->luma_coeff_cost);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_INTRA16x16) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_INTRA4x4) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_INTRAININTER) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_HALFPEL) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_QUARTPEL) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_SUBBLOCK) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_FULLSEARCH) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_DIAMONDSEACH) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_FORCEBLOCKSIZE) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_FASTINTERPOLATE) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_SAD) * b;    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_EXTRASUBPELSEARCH) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->flags |= (USE_SCENEDETECT) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_16x16P) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_16x8P) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_8x16P) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_8x8P) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_8x4P) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_4x8P) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_4x4P) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_16x16B) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_16x8B) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_8x16B) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &b);    param->block_size |= (SEARCH_8x8B) * (!!b);    fgets(line, 254, fd); sscanf(line,"%d", &param->cpu);    fgets(line, 254, fd); sscanf(line, "%d", &param->cabac);    //     fgets(line, 254, fd); sscanf(line,"%s", src_path);    //     fgets(line, 254, fd); sscanf(line,"%s", out_path);    //     fgets(line, 254, fd); sscanf(line,"%s", rec_path);    //     param->rec_name = rec_path;    fclose(fd);}void init_encoder(){    //编码准备    const char* paramfile = "fastspeed.txt";    /*获取fastspeed.txt文件信息*/    init_param(&m_param, paramfile);    m_param.direct_flag = 1;    /*t264编码的打开*/    m_t264 = T264_open(&m_param);    m_lDstSize  = m_param.height * m_param.width + (m_param.height * m_param.width >> 1);      /*分配t264解码后数据存放的内存*/    m_pDst = (uint8_t*)T264_malloc(m_lDstSize, CACHE_SIZE);        /*分配内存用于存放一帧数据长度的数据*/    m_pPoolData = malloc(m_param.width*m_param.height*3/2); }    void udps_respon(int sockfd,int w,int h) {     struct sockaddr_in addrsrc;    struct sockaddr_in addrdst;     int addrlen,n;         int32_t iActualLen;    int row_stride = w*3*h/2;    bzero(&addrdst,sizeof(struct sockaddr_in));     addrdst.sin_family=AF_INET;     /*客户端PC机IP地址*/    addrdst.sin_addr.s_addr=inet_addr("172.18.23.26");    addrdst.sin_port=htons(SERVER_PORT);    while(1)     {         /*数据的采集*/        read_video(NULL,w,h);        /*对采集到的数据通过H264编码*/        iActualLen = T264_encode(m_t264, cam_data, m_pDst, row_stride);        printf("encoded:%d, %d bytes.\n",row_stride,iActualLen);         /*frame_num：存放帧号*/        memcpy(m_pPoolData,&m_t264->frame_num,1);        /*m_pDst解码后的数据*/        memcpy(m_pPoolData+1, m_pDst, iActualLen);        iActualLen++;        /*使用UDP协议发送编码后的数据到客服端*/        sendto(sockfd,m_pPoolData,iActualLen,0,(struct sockaddr*)&addrdst,sizeof(struct sockaddr_in));         } } void free_dev(){  printf("free device\n");  close(cam_fd);}/*主函数入口*/int main(void) {         int sockfd;     struct sockaddr_in addr;    printf("start 2.0...\n"); /*创建套接字*/    sockfd=socket(AF_INET,SOCK_DGRAM,0);     if(sockfd<0)     {        printf("0-");        printf("Socket Error\n");         exit(1);     }     bzero(&addr,sizeof(struct sockaddr_in));     addr.sin_family=AF_INET;     addr.sin_addr.s_addr=htonl(INADDR_ANY);     addr.sin_port=htons(SERVER_PORT);     /*套接字绑定*/    if(bind(sockfd,(struct sockaddr *)&addr,sizeof(struct sockaddr_in))<0 )     {         printf(stderr,"Bind Error:%s\n",strerror(errno));         exit(1);     }     /*该函数完成编码前的准备*/    init_encoder();    atexit( &free_dev );    /*采集数据前的初始化函数*/    init_video(m_param.width,m_param.height);    /*使用UDP协议发送采集到的数据*/    udps_respon(sockfd,m_param.width,m_param.height);         close(sockfd); }