摄像头视频 jpeg lcd上显示 v3.0 （十）

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作者：[e-mail]
博客：yuweixian4230.blog.chinaunix.net 

这里贴上 主程序：  v-3.0.rar  

/***************************************/
/*
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();  //读图片
            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;
}

开发板上的操作

[root@yuweixian yu]# ./capture
the framebuffer device was opended successfully.
init_dev successfully.
zc3xx: probe 2wr ov vga 0x0000
^C
[root@yuweixian yu]# ./capture &
[root@yuweixian yu]# the framebuffer device was opended successfully.
init_dev successfully.
zc3xx: probe 2wr ov vga 0x0000

[root@yuweixian yu]# gsnap t1.jpg /dev/fb0
---------------framebuffer---------------
/dev/fb0:
  width :      320
  height:      240
  bpp   :        2
  r(11,  5)
  g( 5,  6)
  b( 0,  5)
-----------------------------------------
[root@yuweixian yu]# gsnap t2.jpg /dev/fb0
---------------framebuffer---------------
/dev/fb0:
  width :      320
  height:      240
  bpp   :        2
  r(11,  5)
  g( 5,  6)
  b( 0,  5)
-----------------------------------------
[root@yuweixian yu]# ps

截图看看