XvGetPortAttribute man page on aLinux

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XvGetPortAttribute(3)					 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 following table.

       p_value	   Pointer to the location where the attribute value is	 writ‐
		   ten 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 iden‐
       tified  using  an Atom that equates to the attribute name.  The XInter‐
       nAtom 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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