XvQueryExtension - return version and release of extension

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

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.

       XvQueryExtension - return version and release of extension

       [Success]
               Returned if XvQueryExtension(3) completed successfully.

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

Xv(3)

X Version 11                                      libXv 1.0.11                               XvQueryExtension(3)

#include<X11/extensions/Xvlib.h>intXvQueryExtension(Display*dpy,unsignedint*p_version,unsignedint*p_revision,unsignedint*p_request_base,unsignedint*p_event_base,unsignedint*p_error_base);