XvGetPortAttribute(3x)                                  XvGetPortAttribute(3x)

       XvGetPortAttribute - return current port attribute value

       #include <X11/extensions/Xvlib.h>

       XvGetPortAttribute(dpy, port, attribute, p_value)

       Display *dpy;
       XvPortID port;
       Atom attribute;
       int *p_value;

       dpy     Specifies the display screen on which the X Server is to accept
               requests from X clients.  If the display option is not
               specified, X uses the display screen specified by your DISPLAY
               environment variable.  The display option has the format
               hostname:number.  Using two colons (::) instead of one (:)
               indicates that DECnet is to be used for transport.

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

               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

       XvGetPortAttribute(3x) 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 Values
               Returned if XvGetPortAttribute(3x) completed successfully.

               Returned if the Xv extension is unavailable.

               Returned if XvGetPortAttribute(3x) 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.

See Also
       XvSetPortAttribute(3x), XvPortNotify(3x)

X Version 11                      libXv 1.0.1           XvGetPortAttribute(3x)