#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?“v4l2grab.h“
?
#define??TRUE	1
#define??FALSE	0

#define?FILE_VIDEO?	“/dev/video0“
#define?BMP??????	“image_bmp.bmp“
#define?YUV			“image_yuv.yuv“

#define??IMAGEWIDTH????640
#define??IMAGEHEIGHT???480

static???int??????fd;
static???struct???v4l2_capability???cap;
struct?v4l2_fmtdesc?fmtdesc;
struct?v4l2_format?fmtfmtack;
struct?v4l2_streamparm?setfps;??
struct?v4l2_requestbuffers?req;
struct?v4l2_buffer?buf;
enum?v4l2_buf_type?type;
unsigned?char?frame_buffer[IMAGEWIDTH*IMAGEHEIGHT*3];


struct?buffer
{
	void?*?start;
	unsigned?int?length;
}?*?buffers;
?
int?init_v4l2（void）
{
	int?i;
	int?ret?=?0;
	
	//opendev
	if?（（fd?=?open（FILE_VIDEO?O_RDWR））?==?-1）?
	{
		printf（“Error?opening?V4L?interface\n“）;
		return?（FALSE）;
	}

	//query?cap
	if?（ioctl（fd?VIDIOC_QUERYCAP?&cap）?==?-1）?
	{
		printf（“Error?opening?device?%s:?unable?to?query?device.\n“FILE_VIDEO）;
		return?（FALSE）;
	}
	else
	{
?????	printf（“driver:\t\t%s\n“cap.driver）;
?????	printf（“card:\t\t%s\n“cap.card）;
?????	printf（“bus_info:\t%s\n“cap.bus_info）;
?????	printf（“version:\t%d\n“cap.version）;
?????	printf（“capabilities:\t%x\n“cap.capabilities）;
?????	
?????	if?（（cap.capabilities?&?V4L2_CAP_VIDEO_CAPTURE）?==?V4L2_CAP_VIDEO_CAPTURE）?
?????	{
			printf（“Device?%s:?supports?capture.\n“FILE_VIDEO）;
		}

		if?（（cap.capabilities?&?V4L2_CAP_STREAMING）?==?V4L2_CAP_STREAMING）?
		{
			printf（“Device?%s:?supports?streaming.\n“FILE_VIDEO）;
		}
	}?
	
	//emu?all?support?fmt
	fmtdesc.index=0;
	fmtdesc.type=V4L2_BUF_TYPE_VIDEO_CAPTURE;
	printf（“Support?format:\n“）;
	while（ioctl（fdVIDIOC_ENUM_FMT&fmtdesc）!=-1）
	{
		printf（“\t%d.%s\n“fmtdesc.index+1fmtdesc.description）;
		fmtdesc.index++;
	}
	
????//set?fmt
????fmt.type?=?V4L2_BUF_TYPE_VIDEO_CAPTURE;
	fmt.fmt.pix.pixelformat?=?V4L2_PIX_FMT_YUYV;
	fmt.fmt.pix.height?=?IMAGEHEIGHT;
	fmt.fmt.pix.width?=?IMAGEWIDTH;
	fmt.fmt.pix.field?=?V4L2_FIELD_INTERLACED;
	
	if（ioctl（fd?VIDIOC_S_FMT?&fmt）?==?-1）
	{
		printf（“Unable?to?set?format\n“）;
		return?FALSE;
	}?	
	if（ioctl（fd?VIDIOC_G_FMT?&fmt）?==?-1）
	{
		printf（“Unable?to?get?format\n“）;
		return?FALSE;
	}?
	{
?????	printf（“fmt.type:\t\t%d\n“fmt.type）;
?????	printf（“pix.pixelformat:\t%c%c%c%c\n“fmt.fmt.pix.pixelformat?&?0xFF?（fmt.fmt.pix.pixelformat?>>?8）?&?0xFF（fmt.fmt.pix.pixelformat?>>?16）?&?0xFF?（fmt.fmt.pix.pixelformat?>>?24）?&?0xFF）;
?????	printf（“pix.height:\t\t%d\n“fmt.fmt.pix.height）;
?????	printf（“pix.width:\t\t%d\n“fmt.fmt.pix.width）;
?????	printf（“pix.field:\t\t%d\n“fmt.fmt.pix.field）;
	}
	//set?fps
	setfps.type?=?V4L2_BUF_TYPE_VIDEO_CAPTURE;
	setfps.parm.capture.timeperframe.numerator?=?10;
	setfps.

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-08-28?10:14??lab_v4l2_yuyv\
?????文件??????616493??2016-08-26?20:47??lab_v4l2_yuyv\v4
?????文件??????621895??2016-08-27?22:16??lab_v4l2_yuyv\v4l2grab
?????文件????????9833??2016-08-28?10:14??lab_v4l2_yuyv\v4l2grab.c
?????文件????????1981??2012-12-18?06:37??lab_v4l2_yuyv\v4l2grab.h
?????文件???????11741??2012-12-19?04:39??lab_v4l2_yuyv\zed-camera