XvGetPortAttribute(3X)XvGetPortAttribute(3X)NameXvGetPortAttribute - return current port attribute value
Syntax
#include <X11/extensions/Xvlib.h>
XvGetPortAttribute(dpy, port, attribute, p_value)
Display *dpy;
XvPortID port;
Atom attribute;
int *p_vlaue;
Arguments
dpy Specifies the display screen on which the X Server
is to accept requests from X clients. If the dis-
play option is not specified, X uses the display
screen specified by your DISPLAY environment vari-
able. The display option has the format host-
name:number. Using two colons (::) instead of one
(:) indicates that DECnet is to be used for trans-
port.
port Specifies the port, associated with the given dis-
play, 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 written on return.
DescriptionXvGetPortAttribute(3X) 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.
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XvGetPortAttribute(3X)XvGetPortAttribute(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
Returned Values
[Success]
Returned if XvGetPortAttribute(3X) completed suc-
cessfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvGetPortAttribute(3X) failed to allo-
cate 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 AlsoXvSetPortAttribute(3X), XvPortNotify(3X)
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