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XvQueryExtension(3X)			 XvQueryExtension(3X)

Name
       XvQueryExtension - return version and release of extension

Syntax
       #include <X11/extensions/Xvlib.h>

       XvQueryExtension(p_version, p_release,
	    p_request_base, p_event_base, p_error_base)

       unsigned int   *p_version,   *p_release;	  unsigned   int
       *p_request_base, *p_event_base, *p_error_base;

Arguments
       p_version      Pointer to where the current version number
		      of the Xv video extension is written.

       p_release      Pointer to where the release number of  the
		      Xv video extension is written.

       p_request_base Pointer	to   where  the extension  major
		      request number is returned

       p_event_base   Pointer to where the extension  event  base
		      is returned

       p_error_base   Pointer  to  where the extension error base
		      is returned

Description
       XvQueryExtension(3X) returns the version and release  num-
       bers  for  the  Xv video extension currently loaded on the
       system.	The extension major request number,  event  base,
       and error base are also returned.

Returned Values
       [Success]
	       Returns	True  if  XvQueryExtension(3X)	completed
	       successfully.

       [XvBadExtension]
	       Returned if the Xv video extension is  not  avail-
	       able for the named display.

       [XvBadAlloc]
	       Returned if  XvQueryExtension(3X) failed to allo-
	       cate memory to process the request.

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