XvSetPortAttribute

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)



X Version 11                      libXv 1.0.1           XvSetPortAttribute(3x)