x11r4 man page for xvqueryextension

XvQueryExtension(3)					     Library Functions Manual					       XvQueryExtension(3)

Name
       XvQueryExtension - return version and release of extension

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

       XvQueryExtension(Display *dpy, unsigned int *p_version,
		       unsigned int *p_revision,
		       unsigned int *p_request_base,
		       unsigned int *p_event_base,
		       unsigned int *p_error_base);

Arguments
       dpy	      Specifies the connection to the X server.

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

       p_revision     Pointer to where the revision 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(3) returns the version and release numbers 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]
	       Returned if XvQueryExtension(3) completed successfully.

       [XvBadExtension]
	       Returned if the Xv video extension is not available for the named display.

       [XvBadAlloc]
	       Returned if XvQueryExtension(3) failed to allocate memory to process the request.

X Version 11							    libXv 1.0.4 					       XvQueryExtension(3)