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XvGetPortAttribute - return current port attribute value
#include
<X11/extensions/Xvlib.h>
int XvGetPortAttribute(Display *dpy, XvPortID port,
Atom attribute, int p_value);
- 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 written on return.
XvGetPortAttribute(3)
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(3)
completed successfully.
- [XvBadExtension]
- Returned if the Xv extension is unavailable.
- [XvBadAlloc]
- Returned
if XvGetPortAttribute(3)
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(3)
, XvPortNotify(3)
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