XvSetPortAttribute(3X)XvSetPortAttribute(3X)NameXvSetPortAttribute - sets an attribute of a video port
Syntax
#include <X11/extensions/Xvlib.h>
XvSetPortAttribute(dpy, port, attribute, value)
Display *dpy;
XvPortID port;
Atom attribute;
int value;
Arguments
dpy 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 spec-
ified by your DISPLAY environment variable.
The display option has the format host-
name:number. Using two colons (::) instead
of one (:) indicates that DECnet is to be
used for transport.
port Specifies the port for which the attribute
is to be used.
attribute Identifies the port attribute to be set by
this request. Can be one of the table
entries under the column "String," below.
value Identifies the value to which attribute is
to be set. Can be one of the table entries
under the column "Type," below.
DescriptionXvSetPortAttribute(3X) permits a client to set the port
attribute to specified values. This request supports the
following values:
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XvSetPortAttribute(3X)XvSetPortAttribute(3X)
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
The supplied encoding must be one of the encodings listed
for the adaptor, otherwise an Encoding error results.
If the adaptor does not support the exact hue, saturation,
brightness, and contrast levels supplied, the closest lev-
els supported are assumed. Use XvGetPortAttribute(3X) to
query the resulting levels.
When an XvSetPortAttribute(3X) request is processed, a
PortControlNotify(3X) event is generated for all clients
that have requested for port changes using XvSelectPortNo-
tify(3X).
Returned Values
[Success]
Returns True if XvSetPortAttribute(3X) completed
successfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvSelectVideoNotify(3X) failed to
allocate memory to process the request.
Diagnostics
[XvBadPort]
Generated if the requested port does not exist.
[XvBadEncoding]
Generated if an encoding is specified that does
not exist.
[BadMatch]
Generated if the requested attribute atom does not
specify an attribute supported by the adaptor.
See AlsoXvGetPortAttribute(3X), XvSelectPortNotify(3X), XvPortNo-
tify(3X)
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