XvGetPortAttribute(3) XvGetPortAttribute(3)
Name
XvGetPortAttribute - return current port attribute value
Syntax
#include <X11/extensions/Xvlib.h>
XvGetPortAttribute(Display *dpy, XvPortID port,
Atom attribute, int p_value);
Arguments
dpy Specifies the connection to the X server.
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 writ-
ten on return.
Description
XvGetPortAttribute(3) 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(3) completed successfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvGetPortAttribute(3) 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 Also
XvSetPortAttribute(3), XvPortNotify(3)
X Version 11 libXv 1.0.4 XvGetPortAttribute(3)
Mac OS X 10.6 X11 - Generated Sun Mar 7 12:33:21 CST 2010