/*
?*??V4L2?video?capture?example
?*
?*??This?program?can?be?used?and?distributed?without?restrictions.
?*/

#include?
#include?
#include?
#include?

#include??????????????/*?getopt_long（）?*/

#include???????????????/*?low-level?i/o?*/
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#include???????????/*?for?videodev2.h?*/

#include?

#define?CLEAR（x）?memset?（&（x）?0?sizeof?（x））
#define?IMAGE_WIDTH??320
#define?IMAGE_HEIGHT?240

//static?char?yuv420[IMAGE_WIDTH*IMAGE_HEIGHT*3>>1];
static?char?yuv420p[IMAGE_WIDTH*IMAGE_HEIGHT*3>>1];

typedef?enum?{
	IO_METHOD_READ
	IO_METHOD_MMAP
	IO_METHOD_USERPTR
}?io_method;

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

FILE?*?fp_yuv420p;

static?char?*???????????dev_name????????=?NULL;
static?io_method	io		=?IO_METHOD_MMAP;
static?int??????????????fd??????????????=?-1;
struct?buffer?*?????????buffers?????????=?NULL;
static?unsigned?int?????n_buffers???????=?0;

static?void
errno_exit??????????????????????（const?char?*???????????s）
{
????????fprintf?（stderr?“%s?error?%d?%s\n“
?????????????????s?errno?strerror?（errno））;

????????exit?（EXIT_FAILURE）;
}

static?int
xioctl??????????????????????????（int????????????????????fd
?????????????????????????????????int????????????????????request
?????????????????????????????????void?*?????????????????arg）
{
????????int?r;

????????do?r?=?ioctl?（fd?request?arg）;
????????while?（-1?==?r?&&?EINTR?==?errno）;

????????return?r;
}

static?void
process_image???????????????????（const?char?*???????????p）
{
????????//fputc?（‘.‘?stdout）;
	//convert?yuv422?to?yuv420p
	????????char?*y=yuv420p;
	????????char?*u=&yuv420p[IMAGE_WIDTH*IMAGE_HEIGHT];
	????????char?*v=&yuv420p[IMAGE_WIDTH*IMAGE_HEIGHT+IMAGE_WIDTH*IMAGE_HEIGHT/4];

	????????int?i=0j=0l=0;
	????????for（j=0;j	????????	for（i=0;i
	????????		if（j%2==0）{//even?line?to?sample?U-Chriminance
	????????			if（l==1）{//sample?U-Chriminance
	????????			?	*u=p[j*IMAGE_WIDTH*2+i];
	????????			?	u++;
	????????			?}
	????????			?else?if（l==3）{//abandon?V-Chroma
							l=-1;
	????????			?	continue;

	????????			?}
	????????			?else{
	????????			?	*y=p[j*IMAGE_WIDTH*2+i];
	????????			?	++y;
	????????			?}
	????????		}

	????????		else?if（j%2==1）{//odd?lines?to?sample??V-Chroma
	????????			if（l==1）{
	????????				continue;
	????????			}
	????????			else?if（l==3）{
							l=-1;
	????????				*v=p[j*IMAGE_WIDTH*2+i];
	????????				++v;
	????????			}
	????????			else?{
	????????				*y=p[j*IMAGE_WIDTH*2+i];
	????????				++y;
	????????			}

	????????		}

	????????	}

	????????fwrite（yuv420pIMAGE_WIDTH*IMAGE_HEIGHT*3>>11fp_yuv420p）;

	????????fflush?（stdout）;
????????/*******************************************************************

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????1079826??2012-11-25?21:13??pYUV_v05_20091230.exe
?????目錄???????????0??2012-12-08?18:26??攝像頭采集官方程序\
?????文件???????17122??2012-12-08?08:58??攝像頭采集官方程序\offical
?????文件???????18139??2012-12-06?21:39??攝像頭采集官方程序\offical.c
?????文件????11520000??2012-12-08?08:59??攝像頭采集官方程序\yuv420p.yuv
?????目錄???????????0??2012-12-08?18:44??相關教程\
?????文件??????197332??2012-12-08?18:43??相關教程\UbuntuCompilationGuide?–?FFmpeg.pdf
?????文件?????1166407??2012-12-08?18:44??相關教程\V4L2視頻采集與H.264編碼源碼大放送：Linux視頻采集與編碼（三）?-?羽龍飛?-?博客頻道?-?CSDN.pdf
?????文件?????1435426??2012-12-08?18:43??相關教程\V4L2采集yuv視頻花屏：Linux視頻采集與編碼（一）?-?羽龍飛?-?博客頻道?-?CSDN.pdf
?????文件??????644967??2012-12-08?18:43??相關教程\YUYV編碼成h.264：Linux視頻采集與編碼（二）?-?羽龍飛?-?博客頻道?-?CSDN.pdf
?????文件??????418969??2012-12-08?18:44??相關教程\使用libx264將I420編碼為H.pdf
?????文件??????490708??2012-12-08?18:44??相關教程\學習FFmpeg?API?–?解碼視頻?-?bruce_hou的個人空間?-?開源中國社區.pdf
?????目錄???????????0??2012-12-08?18:26??編碼相關的文件\
?????文件??????????66??2012-12-06?14:48??編碼相關的文件\Makefile
?????文件??????268653??2012-12-08?09:00??編碼相關的文件\encode.h264
?????文件?????1202190??2012-12-08?18:17??編碼相關的文件\x264_encoder
?????文件????????5614??2012-12-08?18:17??編碼相關的文件\x264_encoder.c
?????文件????11520000??2012-12-08?08:59??編碼相關的文件\yuv420p.yuv
?????目錄???????????0??2012-12-08?18:26??解碼相關的文件\
?????文件????????1031??2012-12-08?18:01??解碼相關的文件\Makefile
?????文件????11520000??2012-12-08?17:59??解碼相關的文件\decode.yuv
?????文件????????2820??2012-12-08?17:59??解碼相關的文件\decode_h264_zj.c
?????文件??????268653??2012-12-08?09:00??解碼相關的文件\encode.h264