video.c.bak

周立功2410开发板V4L模块应用

/****************************************Copyright (c)**************************************************
**                               Guangzhou ZHIYUAN electronics Co.,LTD.
**                                     
**                                 http://www.zyinside.com
**
**--------------File Info-------------------------------------------------------------------------------
** File Name: video.c
** Last modified Date: 2006-01-14 
** Last Version: v1.0
** Description: 
** Note: 
**------------------------------------------------------------------------------------------------------
** Created By: 周立山
** Created date: 2006-01-01 
** Version: v1.0
** Descriptions:
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Description:
**
********************************************************************************************************/
//  arm-linux-gcc -s -Wall -I/zls/2410/kernel2.4.18/include  -Wstrict-prototypes video.c -o video
//	mknod /dev/video0 c 81 0 
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <stdlib.h>

#include <linux/videodev.h>

#define FILE "/dev/video0"							// 定义打开文件的名称

int main(void)
{
  struct video_capability cap;						// 设备的性能
  struct video_picture vpic;							// 设备的图片特性
	struct video_mbuf	mbuf;									// 设备缓冲区信息
	
	int fd = open(FILE, O_RDONLY);					// 打开设备
  if (fd < 0) {
    perror(FILE);
    exit(1);
  }
  
  printf("\n==================Get struct video_capability=======================\n");
  if (ioctl(fd, VIDIOCGCAP, &cap) < 0) {	// 获取设备性能描述数据结构
    perror("VIDIOGCAP");
    fprintf(stderr, "(" FILE " not a video4linux device?)\n");
    close(fd);
    exit(1); }
  printf(cap.name);printf(", Type:%d\n",cap.type);
  printf("Maxwidth:%d,Maxheight:%d\n",cap.maxwidth ,cap.maxheight);
  printf("Minwidth:%d,Minheight:%d\n",cap.minwidth,cap.minheight);
  printf("Channels:%d,Audios:%d\n",cap.channels,cap.audios);
 

  printf("\n====================Get struct video_mbuf==========================\n");
  if (ioctl(fd, VIDIOCGMBUF, &mbuf) < 0) {	// 获取设备性能描述数据结构
    perror("VIDIOGCAP");
    fprintf(stderr, "(" FILE " not a video4linux device?)\n");
    close(fd);
    exit(1); }
  printf("Memery buffer size:%d\n",mbuf.size);
  printf("Memery buffer frames:%d\n",mbuf.frames );


  printf("\n===================Get struct video_picture=========================\n");
  if (ioctl(fd, VIDIOCGPICT, &vpic) < 0) {	// 获取图象特性数据结构
    perror("VIDIOCGPICT");
    close(fd);
    exit(1); }
	printf("Brightness:%d,Hue:%d,Colour:%d\n",vpic.brightness,vpic.hue,vpic.colour);
	printf("Contrast:%d,Whiteness:%d(Black and white only)\n",vpic.contrast,vpic.whiteness);
	printf("Capture depth:%d,Palette:%d\n",vpic.depth,vpic.palette);

	printf("\nSet vpic.palette to VIDEO_PALETTE_RGB565,and vpic.depth to 16.\n");
  vpic.palette=VIDEO_PALETTE_RGB565;					// 设置调色板
  vpic.depth=16;															// 设置象素深度
  if(ioctl(fd, VIDIOCSPICT, &vpic)==-1) {			// 设置图像特性
     fprintf(stderr, "Unable to find a supported capture format.\n");
     close(fd);
     exit(1);
  }
  
  printf("\n===================Get struct video_picture=========================\n");
  if (ioctl(fd, VIDIOCGPICT, &vpic) < 0) {	// 获取图象特性数据结构
    perror("VIDIOCGPICT");
    close(fd);
    exit(1);
  }
	printf("Brightness:%d,Hue:%d,Colour:%d\n",vpic.brightness,vpic.hue,vpic.colour);
	printf("Contrast:%d,Whiteness:%d(Black and white only)\n",vpic.contrast,vpic.whiteness);
	printf("Capture depth:%d,Palette:%d\n",vpic.depth,vpic.palette);

  close(fd);																	// 关闭设备
  return 0;
}