#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
extern?“C“?{
#	include?
#	include?
}
#include?“capture.h“

struct?Buffer
{
	void?*start;
	size_t?length;
};
typedef?struct?Buffer?Buffer;

struct?Ctx
{
	int?vid;
	int?width?height;	//?輸出圖像大小
	struct?SwsContext?*sws;	//?用于轉(zhuǎn)換
	int?rows;	//?用于?sws_scale（）
	int?bytesperrow;?//?用于cp到?pic_src
	AVPicture?pic_src?pic_target;	//?用于?sws_scale
	Buffer?bufs[2];		//?用于?mmap
????????PixelFormat?fmt;
};
typedef?struct?Ctx?Ctx;

int?capture_get_output_ptr?（void?*c?unsigned?char***ptr?int?**ls）
{
????Ctx?*ctx?=?（Ctx*）c;
????*ptr?=?ctx->pic_target.data;
????*ls?=?ctx->pic_target.linesize;
????return?1;
}

void?*capture_open?（const?char?*dev_name?int?t_width?int?t_height?PixelFormat?tarfmt）
{
	int?id?=?open（dev_name?O_RDWR）;
	if?（id?
	Ctx?*ctx?=?new?Ctx;
	ctx->vid?=?id;

	//?to?query?caps
	v4l2_capability?caps;
	ioctl（id?VIDIOC_QUERYCAP?&caps）;

	if?（caps.capabilities?&?V4L2_CAP_VIDEO_CAPTURE）?{
		if?（caps.capabilities?&?V4L2_CAP_READWRITE）?{
			//?TODO:?...
		}
		if?（caps.capabilities?&?V4L2_CAP_STREAMING）?{
			//?檢查是否支持?MMAP?還是?USERPTR
			v4l2_requestbuffers?bufs;
			memset（&bufs?0?sizeof（bufs））;
			bufs.count?=?2;
			bufs.type?=?V4L2_BUF_TYPE_VIDEO_CAPTURE;
			bufs.memory?=?V4L2_MEMORY_MMAP;
			if?（ioctl（id?VIDIOC_REQBUFS?&bufs）?				fprintf（stderr?“%s:?don‘t?support?MEMORY_MMAP?mode!\n“?__func__）;
				close（id）;
				delete?ctx;
				return?0;
			}

			fprintf（stderr?“%s:?using?MEMORY_MMAP?mode?buf?cnt=%d\n“?__func__?bufs.count）;

			//?mmap
			for?（int?i?=?0;?i?				v4l2_buffer?buf;
				memset（&buf?0?sizeof（buf））;
				buf.type?=?bufs.type;
				buf.memory?=?bufs.memory;
				if?（ioctl（id?VIDIOC_QUERYBUF?&buf）?					fprintf（stderr?“%s:?VIDIOC_QUERYBUF?ERR\n“?__func__）;
					close（id）;
					delete?ctx;
					return?0;
				}

				ctx->bufs[i].length?=?buf.length;
				ctx->bufs[i].start?=?mmap（0?buf.length?PROT_READ|PROT_WRITE
						MAP_SHARED?id?buf.m.offset）;
			}
		}
		else?{
			fprintf（stderr?“%s:?can‘t?support?read（）/write（）?mode?and?streaming?mode\n“?__func__）;
			close（id）;
			delete?ctx;
			return?0;
		}
	}
	else?{
		fprintf（stderr?“%s:?can‘t?support?video?capture!\n“?__func__）;
		close（id）;
		delete?ctx;
		return?0;
	}

	int?rc;

	//?enum?all?support?image?fmt
	v4l2_fmtdesc?fmt_desc;
	uint32_t?index?=?0;

????????//?看起來?不支持?plane?fmt?直接使用?RGB?吧?然后使用?libswscale?轉(zhuǎn)換
#if?1
	do?{
		fmt_desc.index?=?index;
		fmt_desc.type?=?V4L2_BUF_TYPE_VIDEO_CAPTURE;
		rc?=?ioctl（id?VIDIOC_ENUM_FMT?&fmt_desc）;

		if?（rc?>=?0）?{
			fprintf（stderr?“\t?support?%s\n“?fmt_desc.description）;
		}
		index++;
	}?while?（rc?>=?0）;
#endif?//?0
	v4l2_format?fmt;
	fmt.type?=?V4L2_BUF_TYPE_VIDEO_CAPTURE;
	rc?=?ioctl（id?VIDIOC_G_FMT?&fmt）;
	if?（rc?