XvGetPortAttribute(3)           libXv Functions          XvGetPortAttribute(3)

       XvGetPortAttribute - return current port attribute value

       #include <X11/extensions/Xvlib.h>

       int XvGetPortAttribute(Display *dpy, XvPortID port,
                              Atom attribute, int p_value);

       dpy         Specifies the connection to the X server.

       port        Specifies the port, associated with the given display, for
                   which the attribute values are to be returned.

       attribute   An atom that identifies the attribute to be queried by this
                   request.  Control atoms are obtained using the XInternAtom
                   request with a string from the following table.

       p_value     Pointer to the location where the attribute value is
                   written on return.

       XvGetPortAttribute(3) returns the current value of the requested port
       attribute in the integer pointed to by p_value.  The attribute is
       identified using an Atom that equates to the attribute name.  The
       XInternAtom request can be used with one of the strings below to return
       a matching Atom.


              Attribute String   Type             Default
       "XV_ENCODING"      XvEncodingID     Server dependent
       "XV_HUE"           [-1000...1000]   0
       "XV_SATURATION"    [-1000...1000]   0
       "XV_BRIGHTNESS"    [-1000...1000]   0
       "XV_CONTRAST"      [-1000...1000]   0

               Returned if XvGetPortAttribute(3) completed successfully.

               Returned if the Xv extension is unavailable.

               Returned if XvGetPortAttribute(3) failed to allocate memory to
               process the request.

               Generated if the requested port does not exist.

               Generated if the requested attribute atom does not specify an
               attribute supported by the adaptor.

       XvSetPortAttribute(3), XvPortNotify(3)

X Version 11                     libXv 1.0.11            XvGetPortAttribute(3)