/*
?*?v4l2.c
?*
?*??Created?on:?Aug?8?2011
?*??????Author:?gavin
?*/

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
//#include?
#include?

#include?“v4l2grab.h“
#include?“camera.h“

static?int?fd?=?-1;

struct?buffer?{
????void?*??????????????????start;
????size_t??????????????????length;
};

//static?io_method????????io??????????????=?IO_METHOD_MMAP;

struct?buffer?*?????????buffers?????????=?NULL;
static?unsigned?int?????n_buffers???????=?0;

//?global?settings

static?unsigned?int?width?=?800;
static?unsigned?int?height?=?480;
static?char*?deviceName?=?“/dev/video0“;
struct?fb_var_screeninfo?vinfo;
struct?fb_fix_screeninfo?finfo;

static?int?fb_bpp;
static?int?cam_fp?=?-1;
static?int?fb_fp?=?-1;
static?char?*fb_addr?=?NULL;
unsigned?char?frame_buffer[640*480*3];

int?fb_init（void）
{
????int?dev_fp?=?-1;
????int?fb_size;
//????struct?fb_var_screeninfo?vinfo;

????dev_fp?=?open（“/dev/fb0“?O_RDWR）;
????if?（dev_fp?????????perror（“/dev/fb0“）;
????????return?-1;
????}
	if（-1==xioctl（dev_fpFBIOGET_FSCREENINFO&finfo））
	{
		perror（“finfo“）;
			return?-1;
	}
????if?（ioctl（dev_fp?FBIOGET_VSCREENINFO?&vinfo））?{
????????printf（“Error?reading?variable?information.\n“）;
????????exit（1）;
????}
????width=vinfo.xres;
????height=vinfo.yres;
????fb_bpp=vinfo.bits_per_pixel;
????if（fb_bpp==24）
????????fb_bpp=32;
???fb_size=width*height*fb_bpp/8;


????if?（（fb_addr?=?mmap（0?fb_sizePROT_READ?|?PROT_WRITE?MAP_SHARED?dev_fp?0））?????{
????????perror（“mmap（）“）;
????????return?-1;
????}
????printf（“%dx%d?bpp:%d?mmaped?0x%08x\n“widthheightfb_bppfb_addr）;

????return?dev_fp;
}

void?deviceOpen（void）
{
????fd?=?open（deviceName?O_RDWR?/*?required?*/?|?O_NONBLOCK?0）;
????//?check?if?opening?was?successfull
????if?（-1?==?fd）?{
????????fprintf（stderr?“Cannot?open?‘%s‘:?%d?%s\n“?deviceName?errno?strerror?（errno））;
????????exit（EXIT_FAILURE）;
????}
}

/**
??initialize?device
*/
int?deviceInit（void）
{
????struct?v4l2_capability?cap;
????struct?v4l2_cropcap?cropcap;
????struct?v4l2_crop?crop;
????struct?v4l2_format?fmt;


????unsigned?int?min;

????if?（-1?==?xioctl（fd?VIDIOC_QUERYCAP?&cap））?{
????????if?（EINVAL?==?errno）?{
????????????fprintf（stderr?“%s?is?no?V4L2?device\n“deviceName）;
????????????exit（EXIT_FAILURE）;
????????}?else?{
????????????errno_exit（“VIDIOC_QUERYCAP“）;
????????}
????}

????if?（!（cap.capabilities?&?V4L2_CAP_VIDEO_CAPTURE））
????{
????????fprintf（stderr?“%s?is?no?video?capture?device\n“deviceName）;
????????exit（EXIT_FAILURE）;
????}

????struct?v4l2_input?input;
????input.index?=?0;
????if?（?ioctl（fd?VIDIOC_ENUMINPUT?&input）?!=?0）
????{
????????printf（“?set?input?error.\n“）;
????????exit（0）;
????}

????if?（（i

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

?????文件????????753??2013-08-16?11:25??save\camera.h

?????文件????????783??2013-08-11?16:48??save\main.c

?????文件???????1981??2012-12-18?06:37??save\v4l2grab.h

?????文件??????16046??2013-08-16?15:50??save\camera.c

?????目錄??????????0??2013-08-19?16:17??save

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

????????????????19563????????????????????5