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_value;
Arguments
dpy Specifies the display screen on which the X Server is to accept
requests from X clients. If the display option is not speci‐
fied, X uses the display screen specified by your DISPLAY envi‐
ronment variable. The display option has the format host‐
name:number. Using two colons (::) instead of one (:) indi‐
cates that DECnet is to be used for transport.
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 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 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(3x) completed successfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvGetPortAttribute(3x) 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 AlsoXvSetPortAttribute(3x), XvPortNotify(3x)X Version 11 libXv 1.0.1 XvGetPortAttribute(3x)
