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.TH XvSetPortAttribute 3X __vendorversion__
.\" $XFree86: xc/doc/man/Xv/XvSetPortAttribute.man,v 1.6 2001/01/27 18:20:36 dawes Exp $
.SH Name
XvSetPortAttribute \- sets an attribute of a video port
.\"
.SH Syntax
\fB#include <X11/extensions/Xvlib.h>\fR
.sp 1l
\fBXvSetPortAttribute(\fIdpy, port, attribute, value\fR)
.sp 1l
\fBDisplay \fI*dpy\fR;
.br
\fBXvPortID \fIport\fR;
.br
\fBAtom \fIattribute\fR;
.br
\fBint \fIvalue\fR;
.SH Arguments
.\"
.IP \fIdpy\fR 15
Specifies the display screen on which the
Xv Server is to accept requests from Xv clients. If the
display option is not specified, Xv 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 15
Specifies the port for which the attribute is to be used.
.IP \fIattribute\fR 15
Identifies the port attribute to be set by this request.
Can be one of the table entries under the column "String," below.
.IP \fIvalue\fR 15
Identifies the value to which \fIattribute\fP is to be set.
Can be one of the table entries under the column "Type," below.
.\"
.SH Description
XvSetPortAttribute(3X) permits a client to set the port attribute
to specified values. This request supports the following values:
.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
.PP
The supplied encoding must be one of the encodings listed for the
adaptor, otherwise an Encoding error results.
.PP
If the adaptor does not support the exact hue, saturation,
brightness, and contrast levels supplied, the closest levels
supported are assumed. Use XvGetPortAttribute(3X)
to query the resulting levels.
.PP
When an XvSetPortAttribute(3X) request is processed, a
PortControlNotify(3X) event is generated for all clients
that have requested for port changes using XvSelectPortNotify(3X).
.SH Returned Values
.IP [Success] 8
Returned if XvSetPortAttribute(3X) completed successfully.
.IP [XvBadExtension] 8
Returned if the Xv extension is unavailable.
.IP [XvBadAlloc] 8
Returned if XvSelectVideoNotify(3X) failed to allocate memory to process
the request.
.SH Diagnostics
.IP [XvBadPort] 8
Generated if the requested port does not exist.
.IP [XvBadEncoding] 8
Generated if an encoding is specified that does not exist.
.IP [BadMatch] 8
Generated if the requested attribute atom does not specify an attribute
supported by the adaptor.
.SH See Also
.\"
XvGetPortAttribute(3X), XvSelectPortNotify(3X), XvPortNotify(3X)
.br
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