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X11R7.4 - man page for xv (x11r4 section 3)

Xv(3)					       Library Functions Manual 					Xv(3)

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(3) to gain access and manage sharing of a display's video resources.  Typically, a client will
       use XvQueryExtension(3) to determine the status of the extension, XvQueryAdaptors(3) to get a  description  of
       what  video  adaptors  exist,  and XvQueryEncodings(3) 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 supported.  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(3) - return current port attribute value

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

       XvGetVideo(3) - capture video from a drawable

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

       XvPortNotify(3) - event generated when port attributes change

       XvPutStill(3) - write a single frame of video to a drawable

       XvPutVideo(3) - write video into a drawable

       XvQueryAdaptors(3) - return adaptor information for a screen

       XvQueryBestSize(3) - determine the optimum drawable region size

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

       XvQueryExtension(3) - return version and revision of extension

       XvSelectPortNotify(3) - enable or disable XvPortNotify events

       XvSelectVideoNotify(3) - enable or disable XvVideoNotify events

       XvSetPortAttribute(3) - set an attribute for a port

       XvStopVideo(3) - stop active video

       XvUngrabPort(3) - release a grabbed port

       XvVideoNotify(3) - event generated for video processing

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

X Version 11					     libXv 1.0.4						Xv(3)


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