#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?“cam.h“
#include?“mutexs.h“
#include?“convert.h“

#define	REQBUFS_COUNT	4

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

struct?v4l2_requestbuffers?reqbufs;
struct?cam_buf?bufs[REQBUFS_COUNT];

int?camera_init（char?*devpath?unsigned?int?*width?unsigned?int?*height?unsigned?int?*size?unsigned?int?*ismjpeg）
{
	int?i;
	int?fd?=?-1;;
	int?ret;
	struct?v4l2_buffer?vbuf;
	struct?v4l2_format?format;
	struct?v4l2_capability?capability;
	/*open?打開設備文件*/
	if（（fd?=?open（devpath?O_RDWR））?==?-1）{
		perror（“open:“）;	
		return?-1;		
	}
	/*ioctl?查看支持的驅動*/
	ret?=?ioctl（fd?VIDIOC_QUERYCAP?&capability）;
	if?（ret?==?-1）?{
		perror（“camera->init“）;
		return?-1;
	}
	/*判斷設備是否支持視頻采集*/
	if（!（capability.capabilities?&?V4L2_CAP_VIDEO_CAPTURE））?{
		fprintf（stderr?“camera->init:?device?can?not?support?V4L2_CAP_VIDEO_CAPTURE\n“）;
		close（fd）;
		return?-1;
	}
	/*判斷設備是否支持視頻流采集*/
	if（!（capability.capabilities?&?V4L2_CAP_STREAMING））?{
		fprintf（stderr?“camera->init:?device?can?not?support?V4L2_CAP_STREAMING\n“）;
		close（fd）;
		return?-1;
	}
	/*設置捕獲的視頻格式?MYJPEG*/
	memset（&format?0?sizeof（format））;
	format.type?=?V4L2_BUF_TYPE_VIDEO_CAPTURE;
	format.fmt.pix.pixelformat?=?V4L2_PIX_FMT_YUYV;
	format.fmt.pix.width?=?*width;
	format.fmt.pix.height?=?*height;
	format.fmt.pix.field?=?V4L2_FIELD_ANY;
	ret?=?ioctl（fd?VIDIOC_S_FMT?&format）;
	if（ret?==?-1）?{
		perror（“camera?init“）;
		return?-1;
	}?else?{
		*ismjpeg?=?1;
		fprintf（stdout?“camera->init:?picture?format?is?yuyv\n“）;
		goto?get_fmt;
	}
	/*設置捕獲的視頻格式?YUYV*/
	memset（&format?0?sizeof（format））;
	format.type?=?V4L2_BUF_TYPE_VIDEO_CAPTURE;			//永遠都是這個類型
	format.fmt.pix.pixelformat?=?V4L2_PIX_FMT_MJPEG;		//設置采集圖片的格式
	format.fmt.pix.width?=?*width;
	format.fmt.pix.height?=?*height;
	format.fmt.pix.field?=?V4L2_FIELD_ANY;				//設置圖片一行一行的采集
	ret?=?ioctl（fd?VIDIOC_S_FMT?&format）;				//ioctl	是設置生效
	if（ret?==?-1）
		perror（“camera?init“）;
	else?{
		fprintf（stdout?“camera->init:?picture?format?is?mjpeg\n“）;
		*ismjpeg?=?0;
		goto?get_fmt;
	}

get_fmt:
	ret?=?ioctl（fd?VIDIOC_G_FMT?&format）;
	if?（ret?==?-1）?{
		perror（“camera?init“）;
		return?-1;
	}
	/*向驅動申請緩存*/
	memset（&reqbufs?0?sizeof（struct?v4l2_requestbuffers））;
	reqbufs.count	=?REQBUFS_COUNT;					//緩存區個數
	reqbufs.type	=?V4L2_BUF_TYPE_VIDEO_CAPTURE;
	reqbufs.memory	=?V4L2_MEMORY_MMAP;					//設置操作申請緩存的方式:映射?MMAP
	ret?=?ioctl（fd?VIDIOC_REQBUFS?&reqbufs）;			
	if?（ret?==?-1）?{	
		perror（“camera?init“）;
		close（fd）;
		return?-1;
	}
	/*循環映射并入隊*/
	for?（i?=?0;?i?		/*真正獲取緩存的地址大小*/
		memset（&vbuf?0?sizeof（struct?v4l2_buffer））;
		vbuf.type?=?V4L2_BUF_TYPE_VIDEO_CAPTURE;
		vbuf.memory?=?V4L2_MEMORY_MMAP;
		vbuf.index?=?i;
		ret?=?ioctl（fd?VIDIOC_QUERYBUF?&vbuf）;
		if?（ret?==?-1）?{
			perror（“camera?init“）;
			close（fd）;
			return?-1;

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-06-04?11:41??Smarthome_server\
?????文件??????614400??2017-03-07?17:18??Smarthome_server\3.jpg
?????文件?????????421??2017-03-10?14:46??Smarthome_server\Makefile
?????文件?????????421??2017-03-10?14:46??Smarthome_server\Makefile~
?????目錄???????????0??2017-03-10?16:41??Smarthome_server\include\
?????文件?????????614??2016-11-30?14:29??Smarthome_server\include\cam.h
?????文件?????????614??2016-11-30?14:29??Smarthome_server\include\cam.h~
?????文件?????????358??2016-11-04?11:02??Smarthome_server\include\convert.h
?????文件?????????265??2016-10-25?14:49??Smarthome_server\include\login.h~
?????文件?????????175??2017-03-07?15:46??Smarthome_server\include\module.h
?????文件?????????175??2017-03-07?15:46??Smarthome_server\include\module.h~
?????文件?????????137??2016-11-30?13:24??Smarthome_server\include\mutexs.h
?????文件?????????137??2016-11-30?13:24??Smarthome_server\include\mutexs.h~
?????文件?????????503??2017-01-12?21:57??Smarthome_server\include\serial.h
?????文件?????????634??2016-11-30?16:37??Smarthome_server\include\srv.h~
?????文件?????????442??2017-03-07?16:42??Smarthome_server\include\tcp_server.h
?????文件?????????442??2017-03-07?16:42??Smarthome_server\include\tcp_server.h~
?????文件????????5077??2016-10-20?14:20??Smarthome_server\include\zgb.h~
?????文件?????????188??2017-03-07?17:06??Smarthome_server\include\zigbee.h
?????文件?????????188??2017-03-07?17:06??Smarthome_server\include\zigbee.h~
?????文件???????62613??2017-03-10?16:26??Smarthome_server\server
?????目錄???????????0??2017-03-10?16:41??Smarthome_server\src\
?????文件????????8275??2017-03-10?16:26??Smarthome_server\src\cam.c
?????文件????????8275??2017-03-10?16:26??Smarthome_server\src\cam.c~
?????文件????????8582??2015-11-10?13:54??Smarthome_server\src\convert.c
?????文件????????1741??2016-11-15?16:08??Smarthome_server\src\login.c~
?????文件????????1938??2017-03-10?15:39??Smarthome_server\src\main.c
?????文件????????1938??2017-03-10?15:39??Smarthome_server\src\main.c~
?????文件????????3329??2017-03-10?16:14??Smarthome_server\src\module.c
?????文件????????3329??2017-03-10?16:14??Smarthome_server\src\module.c~
?????文件????????6995??2017-01-12?22:04??Smarthome_server\src\serial.c
............此處省略6個文件信息