XvQueryExtension






XvQueryExtension − return version and release of extension

#include<X11/extensions/Xvlib.h>

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



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



     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.



[Success]
        Returned if completed successfully.

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