XvSetPortAttribute(3X) XvSetPortAttribute(3X)
Name
XvSetPortAttribute - sets an attribute of a video port
Syntax
#include <X11/extensions/Xvlib.h>
XvSetPortAttribute(dpy, port, attribute, value)
Display *dpy;
XvPortID port;
Atom attribute;
int value;
Arguments
dpy Specifies the display screen on which the Xv Server is to accept requests from Xv clients. If the display option is not
specified, Xv 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.
port Specifies the port for which the attribute is to be used.
attribute Identifies the port attribute to be set by this request. Can be one of the table entries under the column "String," below.
value Identifies the value to which attribute is to be set. Can be one of the table entries under the column "Type," below.
Description
XvSetPortAttribute(3X) permits a client to set the port attribute to specified values. This request supports the following values:
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
The supplied encoding must be one of the encodings listed for the adaptor, otherwise an Encoding error results.
If the adaptor does not support the exact hue, saturation, brightness, and contrast levels supplied, the closest levels supported are
assumed. Use XvGetPortAttribute(3X) to query the resulting levels.
When an XvSetPortAttribute(3X) request is processed, a PortControlNotify(3X) event is generated for all clients that have requested for
port changes using XvSelectPortNotify(3X).
Returned Values
[Success]
Returned if XvSetPortAttribute(3X) completed successfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvSelectVideoNotify(3X) failed to allocate memory to process the request.
Diagnostics
[XvBadPort]
Generated if the requested port does not exist.
[XvBadEncoding]
Generated if an encoding is specified that does not exist.
[BadMatch]
Generated if the requested attribute atom does not specify an attribute supported by the adaptor.
See Also
XvGetPortAttribute(3X), XvSelectPortNotify(3X), XvPortNotify(3X)
XFree86 Version Version 4.3.0 XvSetPortAttribute(3X)