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/X11/extensions/Xv.h
/***********************************************************
Copyright 1991 by Digital Equipment Corporation, Maynard, Massachusetts,
and the Massachusetts Institute of Technology, Cambridge, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the names of Digital or MIT not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/

#ifndef XV_H
#define XV_H
/*
** File:
**
**   Xv.h --- Xv shared library and server header file
**
** Author:
**
**   David Carver (Digital Workstation Engineering/Project Athena)
**
** Revisions:
**
**   05.15.91 Carver
**     - version 2.0 upgrade
**
**   01.24.91 Carver
**     - version 1.4 upgrade
**
*/

#include <X11/X.h>

#define XvName "XVideo"
#define XvVersion 2
#define XvRevision 2

/* Symbols */

typedef XID XvPortID;
typedef XID XvEncodingID;

#define XvNone 0

#define XvInput          0
#define XvOutput         1

#define XvInputMask      (1<<XvInput)
#define XvOutputMask     (1<<XvOutput)
#define XvVideoMask	 0x00000004
#define XvStillMask	 0x00000008
#define XvImageMask	 0x00000010

/* These two are not client viewable */
#define XvPixmapMask	 0x00010000
#define XvWindowMask	 0x00020000


#define XvGettable	0x01
#define XvSettable	0x02

#define XvRGB		0
#define XvYUV		1

#define XvPacked	0
#define XvPlanar	1

#define XvTopToBottom	0
#define XvBottomToTop	1


/* Events */

#define XvVideoNotify 0
#define XvPortNotify 1
#define XvNumEvents 2

/* Video Notify Reasons */

#define XvStarted 0
#define XvStopped 1
#define XvBusy 2
#define XvPreempted 3
#define XvHardError 4
#define XvLastReason 4

#define XvNumReasons (XvLastReason + 1)

#define XvStartedMask     (1<<XvStarted)
#define XvStoppedMask     (1<<XvStopped)
#define XvBusyMask        (1<<XvBusy)
#define XvPreemptedMask   (1<<XvPreempted)
#define XvHardErrorMask   (1<<XvHardError)

#define XvAnyReasonMask   ((1<<XvNumReasons) - 1)
#define XvNoReasonMask    0

/* Errors */

#define XvBadPort 0
#define XvBadEncoding 1
#define XvBadControl 2
#define XvNumErrors 3

/* Status */

#define XvBadExtension 1
#define XvAlreadyGrabbed 2
#define XvInvalidTime 3
#define XvBadReply 4
#define XvBadAlloc 5

#endif /* XV_H */

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