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X11R7.4 - man page for xvgetportattribute (x11r4 section 3)

XvGetPortAttribute(3)		     Library Functions Manual		    XvGetPortAttribute(3)

Name
       XvGetPortAttribute - return current port attribute value

Syntax
       #include <X11/extensions/Xvlib.h>

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

Arguments
       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 fol-
		   lowing table.

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

Description
       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 Values
       [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.

Diagnostics
       [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.

See Also
       XvSetPortAttribute(3), XvPortNotify(3)

X Version 11				   libXv 1.0.4			    XvGetPortAttribute(3)


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