#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?	/*?gettimeofday（）?*/
#include?
#include?
#include?
#include?
#ifdef?HAVE_LIBZ
#include?
#endif
#ifdef?HAVE_LIBPNG
#include?
#endif
#ifdef?HAVE_LIBJPEG
#include?
#endif
#include?“v4l.h“

#define?DEF_WIDTH	320	/*?default?width?*/
#define?DEF_HEIGHT	240	/*?default?height?*/

#define?FMT_UNKNOWN		0
#define?FMT_PPM			1
#define?FMT_PGM			2
#define?FMT_PNG			3
#define?FMT_JPEG		4
#define?FMT_YUV4MPEG	5

#define?IN_TV			0
#define?IN_COMPOSITE	1
#define?IN_COMPOSITE2	2
#define?IN_SVIDEO		3

#define?NORM_PAL		0
#define?NORM_NTSC		1
#define?NORM_SECAM		2

#define?QUAL_DEFAULT	80

char?*basename?（const?char?*s）;

/*?globals
?*/
static?int?verbose?=?0;

/*
?*/
void
usage?（char?*pname）
{
	fprintf?（stderr
	“VidCat?Version?%s\n“
	“Usage:?%s?\n“
	“?-b??????????????????????????make?a?raw?PPM?instead?of?an?ASCII?one\n“
	“?-d??????????????????video?device?（default:?“VIDEO_DEV“）\n“
	“?-f?{ppm|jpeg|png|yuv4mpeg}??output?format?of?the?image\n“
	“?-g??????????????????????????greayscale?instead?of?color\n“
	“?-i?{tv|comp1|comp2|s-video}?which?input?channel?to?use\n“
	“?-l??????????????????????????loop?on?doesn‘t?make?sense?in?most?cases\n“
	“?-n?{pal|ntsc|secam}?????????select?video?norm\n“
	“?-o????????????????????write?output?to?file?instead?of?stdout\n“
	“?-p?c|g|y|Y??????????????????videopalette?to?use\n“
	“?-q?????????????????only?for?jpeg:?quality?setting?（1-100“
		“?default:?%d）\n“
	“?-s?NxN??????????????????????define?size?of?the?output?image?（default:“
		“?%dx%d）\n“
	“Example:?vidcat?|?xsetbg?stdin\n“
		VERSION?（char*）basename（pname）?QUAL_DEFAULT?DEF_WIDTH?DEF_HEIGHT）;
	exit?（1）;
}

/*
?*/
double
ms_time?（void）
{
	static?struct?timeval?tod;
	gettimeofday?（&tod?NULL）;
	return?（（double）tod.tv_sec?*?1000.0?+?（double）tod.tv_usec?/?1000.0）;
	
}


/*
?*?read?rgb?image?from?v4l?device?從v4l設備獲取rgb圖像
?*?return:?mmap‘ed?buffer?and?size
?*/
char?*
get_image?（int?dev?int?width?int?height?int?palette?int?*size）
{
	struct?video_mbuf?vid_buf;
	struct?video_mmap?vid_mmap;
	char?*map?*convmap;?//map指向抓到的圖片所存空間
	int?len;?
	int?bytes?=?3;??//比特每像素

	if?（palette?==?VIDEO_PALETTE_GREY）?//若為灰度圖象
		bytes?=?1;	/*?bytes?per?pixel?*/

	if?（ioctl?（dev?VIDIOCGMBUF?&vid_buf）?==?-1）?{
		/*?to?do?a?normal?read（）
		?*/
		struct?video_window?vid_win;
		if?（verbose）?{
			fprintf?（stderr?“using?read（）\n“）;
		}

		if?（ioctl?（dev?VIDIOCGWIN?&vid_win）?!=?-1）?{
			vid_win.width??=?width;
			vid_win.height?=?height;
			if?（ioctl?（dev?VIDIOCSWIN?&vid_win）?==?-1）?{
				perror?（“ioctl（VIDIOCSWIN）“）;??//ioctl函數功能？？
				return?（NULL）;
			}
		}

		map?=?malloc?（width?*

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????16582??2008-11-20?21:30??arm9上攝像頭抓圖源代碼（v4l通用）\vidcat.c

?????目錄??????????0??2013-01-06?14:28??arm9上攝像頭抓圖源代碼（v4l通用）

-----------?---------??----------?-----??----

????????????????16582????????????????????2