晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/linux/ivtv.h
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
    Public ivtv API header
    Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
    Copyright (C) 2004-2007  Hans Verkuil <hverkuil@xs4all.nl>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef __LINUX_IVTV_H__
#define __LINUX_IVTV_H__


#include <linux/types.h>
#include <linux/videodev2.h>

/* ivtv knows several distinct output modes: MPEG streaming,
   YUV streaming, YUV updates through user DMA and the passthrough
   mode.

   In order to clearly tell the driver that we are in user DMA
   YUV mode you need to call IVTV_IOC_DMA_FRAME with y_source == NULL
   first (althrough if you don't then the first time
   DMA_FRAME is called the mode switch is done automatically).

   When you close the file handle the user DMA mode is exited again.

   While in one mode, you cannot use another mode (EBUSY is returned).

   All this means that if you want to change the YUV interlacing
   for the user DMA YUV mode you first need to do call IVTV_IOC_DMA_FRAME
   with y_source == NULL before you can set the correct format using
   VIDIOC_S_FMT.

   Eventually all this should be replaced with a proper V4L2 API,
   but for now we have to do it this way. */

struct ivtv_dma_frame {
	enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_OUTPUT */
	__u32 pixelformat;	 /* 0 == same as destination */
	void *y_source;   /* if NULL and type == V4L2_BUF_TYPE_VIDEO_OUTPUT,
				    then just switch to user DMA YUV output mode */
	void *uv_source;  /* Unused for RGB pixelformats */
	struct v4l2_rect src;
	struct v4l2_rect dst;
	__u32 src_width;
	__u32 src_height;
};

#define IVTV_IOC_DMA_FRAME		_IOW ('V', BASE_VIDIOC_PRIVATE+0, struct ivtv_dma_frame)

/* Select the passthrough mode (if the argument is non-zero). In the passthrough
   mode the output of the encoder is passed immediately into the decoder. */
#define IVTV_IOC_PASSTHROUGH_MODE	_IOW ('V', BASE_VIDIOC_PRIVATE+1, int)

/* Deprecated defines: applications should use the defines from videodev2.h */
#define IVTV_SLICED_TYPE_TELETEXT_B     V4L2_MPEG_VBI_IVTV_TELETEXT_B
#define IVTV_SLICED_TYPE_CAPTION_525    V4L2_MPEG_VBI_IVTV_CAPTION_525
#define IVTV_SLICED_TYPE_WSS_625        V4L2_MPEG_VBI_IVTV_WSS_625
#define IVTV_SLICED_TYPE_VPS            V4L2_MPEG_VBI_IVTV_VPS

#endif /* _LINUX_IVTV_H */

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