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+.TH XvGetPortAttribute 3X __vendorversion__
+.\" $XFree86: xc/doc/man/Xv/XvGetPortAttribute.man,v 1.6 2001/01/27 18:20:35 dawes Exp $
+.SH Name
+XvGetPortAttribute \- return current port attribute value
+.\"
+.SH Syntax
+.B #include <X11/extensions/Xvlib.h>
+.sp 1l
+.B XvGetPortAttribute(\fIdpy, port, attribute, p_value\fR)
+.sp 1l
+\fBDisplay \fI*dpy\fR;
+.br
+\fBXvPortID \fIport\fR;
+.br
+\fBAtom \fIattribute\fR;
+.br
+\fBint \fI*p_vlaue\fR;
+.sp 1l
+.\"
+.SH Arguments
+.\"
+.IP \fIdpy\fR 8
+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.
+.IP \fIport\fR 8
+Specifies the port, associated with the given display, for
+which the attribute values are to be returned. 
+.IP \fIattribute\fR 8
+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.
+.IP \fIp_value\fR 8
+Pointer to the location where the attribute value is written on
+return.
+.\"
+.SH Description
+.\"
+.PP
+XvGetPortAttribute(3X) returns the current value of the requested
+port attribute in the integer pointed to by \fIp_value\fR.  
+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.
+.bp
+.PP
+.\" .TS
+.\" tab(@);
+.\" lfHB lfHB lfHB
+.\" lfR  lfR  lfR .
+.\" _
+.\" .PP
+.\" .sp 4p
+.\" Attribute String@Type@Default
+.\" .sp 6p
+.\" _
+.\" .sp 6p
+.\" "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
+.\" .sp 6p
+.\" .TE
+.nf
+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
+.fi
+.SH Returned Values
+.IP [Success] 8
+Returned if XvGetPortAttribute(3X) completed successfully.
+.IP [XvBadExtension] 8
+Returned if the Xv extension is unavailable.
+.IP [XvBadAlloc] 8
+Returned if XvGetPortAttribute(3X) failed to allocate memory to process
+the request.
+.SH Diagnostics
+.IP [XvBadPort] 8
+Generated if the requested port does not exist.
+.IP [BadMatch] 8
+Generated if the requested attribute atom does not specify an attribute 
+supported by the adaptor.
+.SH See Also
+.\"
+XvSetPortAttribute(3X), XvPortNotify(3X)
+.br
+
+
+
+