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xv(3x) [xfree86 man page]

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 draw-
       able 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 extension, 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  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(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 drawable

       XvPutVideo(3X) - write video into a drawable

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

       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.

XFree86 							   Version 4.7.0							    Xv(3X)

Check Out this Related Man Page

Xv(3)								  libXv Functions							     Xv(3)

NAME
Xv - X Window System video extension DESCRIPTION
The X Video Extension (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 draw- able 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. The Xv protocol version 2.2 and later is extended to support client images in alternate colorspaces (XvImages). Xv adaptors which are capable of displaying XvImages will have the XvImageMask field set in the type field of the XvAdaptorInfo. XvImage formats supported by the port may be queried with XvListImageFormats(3). XvImages may be created with the help of XvCreateImage(3) or XvShmCreateImage(3); XvImages may be displayed with XvPutImage(3) or XvShmPutImage(3). The Port attributes of the port specified in the Xv(Shm)PutImage command will be valid for the image operation when applicable. There will be a port encoding with the name "XV_IMAGE". The width and height of that encoding will indicate the maximum source image size. SUMMARY OF LIBRARY FUNCTIONS
The following is a summary of Xv library functions and events: XvCreateImage(3) - create an XvImage 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 XvListImageFormats(3) - return list of image formats for a port XvPortNotify(3) - event generated when port attributes change XvPutImage(3) - write a XvImage to a drawable 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 XvQueryPortAttributes(3) - return list of attributes of a port XvSelectPortNotify(3) - enable or disable XvPortNotify events XvSelectVideoNotify(3) - enable or disable XvVideoNotify events XvSetPortAttribute(3) - set an attribute for a port XvShmCreateImage(3) - create an XvImage in shared memory XvShmPutImage(3) - write a XvImage in shared memory to a drawable XvStopVideo(3) - stop active video XvUngrabPort(3) - release a grabbed port XvVideoNotify(3) - event generated for video processing Each of these functions and events is described in its own Xv man page. X Version 11 libXv 1.0.5 Xv(3)
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