XvGetPortAttribute - return current port attribute 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

       [XvBadPort]
               Generated if the requested port does not exist.

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

       XvGetPortAttribute - return current port attribute value

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

       [XvBadExtension]
               Returned if the Xv extension is unavailable.

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

XvSetPortAttribute(3), XvPortNotify(3)

X Version 11                                      libXv 1.0.11                             XvGetPortAttribute(3)

#include<X11/extensions/Xvlib.h>intXvGetPortAttribute(Display*dpy,XvPortIDport,Atomattribute,intp_value);