Xv man page on BSDi

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Xv(3X)							Xv(3X)

Name
       Xv - X Window System video extension

Description
       The  Xv	extension  provides  support  for  video adaptors
       attached to an X display.  It takes the	approach  that	a
       display may have one or more video adaptors, each of which
       has one or more	ports  through	which  independent  video
       streams pass.

       An  adaptor  may be  able to display video in a drawable,
       capture video from a drawable,  or  both.   It  translates
       between	video  encoding (NTSC,	PAL,  SECAM, etc...) and
       drawable format (depth and visual-id pair). An adaptor may
       support	multiple video encodings and/or multiple drawable
       formats.

       Clients use Xv(3X) to gain access and manage sharing of	a
       display's  video resources.  Typically, a client will use
       XvQueryExtension(3X) to determine the status of the exten-
       sion,  XvQueryAdaptors(3X)  to  get  a description of what
       video adaptors exist, and XvQueryEncodings(3X)  to  get	a
       description of what video encodings an adaptor supports.

       Once  a	client	has  determined what video resources are
       available, it is free to put video into a drawable or  get
       video  from  a  drawable,  according the capabilities sup-
       ported.	Clients can select to receive events  when  video
       activity changes	 in  a drawable and when port attributes
       have changed.

Summary of Library Functions
       The following is a summary of Xv library functions:

       XvGetPortAttribute(3X) - return	current	 port	attribute
       value

       XvGetStill(3X)  -  capture  a single frame of video from a
       drawable

       XvGetVideo(3X) - capture video from a drawable

       XvGrabPort(3X) - lock port for exclusive use by client

       XvPortNotify(3X) - event generated  when port  attributes
       change

       XvPutStill(3X)  - write a single frame of video to a draw-
       able

       XvPutVideo(3X) - write video into a drawable

       XvQueryAdaptors(3X) - return  adaptor  information  for	a
       screen

								1

Xv(3X)							Xv(3X)

       XvQueryBestSize(3X)   -	determine  the	optimum drawable
       region size

       XvQueryEncodings(3X) - return list  of  encodings  for  an
       adaptor

       XvQueryExtension(3X)  -	return	version and  revision of
       extension

       XvSelectPortNotify(3X) - enable	or  disable  XvPortNotify
       events

       XvSelectVideoNotify(3X)	- enable or disable XvVideoNotify
       events

       XvSetPortAttribute(3X) - set an attribute for a port

       XvStopVideo(3X) - stop active video

       XvUngrabPort(3X) - release a grabbed port

       XvVideoNotify(3X) - event generated for video processing

       Each of these functions is described in	its  own  Xv  man
       page.

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