GNU/Linux man pages
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Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.3 |
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XvGetPortAttribute(3x) |
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XvGetPortAttribute − return current port attribute value
#include <X11/extensions/Xvlib.h>
XvGetPortAttribute(dpy, port, attribute, p_value)
Display
*dpy;
XvPortID port;
Atom attribute;
int *p_value;
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dpy |
Specifies the display screen on which the X Server is to accept requests from X clients. If the display option is not specified, X 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. | ||
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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.
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p_value |
Pointer to the location where the attribute value is written on return. |
XvGetPortAttribute(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.
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
[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.
[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.
XvSetPortAttribute(3x), XvPortNotify(3x)
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XvGetPortAttribute(3x) | |