S3C2440 USB 摄像头应用程序

/***************************************/ /* author: yuweixian blog: http://blog.chinaunix.net/space.php?uid=22666248 date: 2011.5.4 function: display usb-camera video on lcd by framebuffer compile : arm-linux-gcc capture.c -ljpeg -o capture how to use: ./capture ok..enjoy it */ /**************************************/ #include "v4l2.h" #include "frame_jpeg.h" int main(int argc,char **argv) { FRAME_DEV frame_dev; //framebufrer 结构体 JPEG_DEV jpeg_dev; // jpeg 解码 结构体 init_framebuffer(&frame_dev); //初始化 framebuffer 设备 open_v4l2_device (); //打开 v4l2 设备 init_v4l2_device (); //初始化 设备 start_capturing (); //开始捕获 视频图片 for (;;) { fd_set fds; struct timeval tv; int r; FD_ZERO (&fds); FD_SET (fd, &fds); /* Timeout. */ tv.tv_sec = 2; tv.tv_usec = 0; r = select (fd + 1, &fds, NULL, NULL, &tv); if (-1 == r) { if (EINTR == errno) continue; v4l2_errno_exit ("select"); } if (0 == r) { fprintf (stderr, "select timeout\n"); exit (EXIT_FAILURE); } while(1) { read_frame(); // 读出一帧数据，并存储成一张图片，方便后面解码 if((jpeg_dev.infile=fopen("mmap.jpg","rb"))==NULL) //打开 解码图片 { fprintf(stderr,"open %s failed \n",argv[1]); exit(-1); } init_jpeg(&jpeg_dev); //图片 初始化 judge_large_picture(&frame_dev,&jpeg_dev); //if picture is too large ,return -1; //申请 动态空间 jpeg_dev.buffer=(unsigned char *)malloc(jpeg_dev.cinfo.output_width*jpeg_dev.cinfo.output_components); dispaly_picture(&frame_dev,&jpeg_dev); //显示图片到 lcd上 close_jpeg(&jpeg_dev); // 关闭 这张 图片 结构体 //close_framebuffer(&frame_dev); } } close_framebuffer(&frame_dev); uninit_v4l2_device (); close_v4l2_device (); exit (EXIT_SUCCESS); return 0; }