XvSelectPortNotify(3) libXv Functions XvSelectPortNotify(3)NAME
XvSelectPortNotify - enable or disable XvPortNotify events
SYNOPSIS
#include <X11/extensions/Xvlib.h>
int XvSelectPortNotify(Display *dpy, XvPortID port, Bool onoff);
ARGUMENTS
dpy Specifies the connection to the X server.
port Specifies the port for which PortNotify events are to be generated when its attributes are changed using XvSetPortAttribute(3)
onoff Specifies whether notification is to be enabled or disabled.
DESCRIPTION XvSelectPortNotify(3) enables or disables PortNotify event delivery to the requesting client. XvPortNotify(3) events are generated when
port attributes are changed using XvSetPortAttribute(3).
RETURN VALUES
[Success]
Returned if XvSelectPortNotify(3) completed successfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvSelectPortNotify(3) failed to allocate memory to process the request.
DIAGNOSTICS
[XvBadPort]
Generated if the requested port does not exist.
SEE ALSO XvSetPortNotify(3), XvSetPortAttribute(3), XvPortNotify(3)X Version 11 libXv 1.0.7 XvSelectPortNotify(3)
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XvSetPortAttribute(3) libXv Functions XvSetPortAttribute(3)NAME
XvSetPortAttribute - sets an attribute of a video port
SYNOPSIS
#include <X11/extensions/Xvlib.h>
int XvSetPortAttribute(Display *dpy, XvPortID port,
Atom attribute, int value);
ARGUMENTS
dpy Specifies the connection to the X server.
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(3)
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(3) to query the resulting levels.
When an XvSetPortAttribute(3) request is processed, a XvPortNotify(3) event is generated for all clients that have requested notification
of port changes using XvSelectPortNotify(3).
RETURN VALUES
[Success]
Returned if XvSetPortAttribute(3) completed successfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvSelectVideoNotify(3) 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(3), XvQueryPortAttributes(3), XvSelectPortNotify(3), XvPortNotify(3)X Version 11 libXv 1.0.9 XvSetPortAttribute(3)