1XvGetPortAttribute(3)      Library Functions Manual      XvGetPortAttribute(3)
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Name

6       XvGetPortAttribute - return current port attribute value
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Syntax

9       #include <X11/extensions/Xvlib.h>
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11       XvGetPortAttribute(dpy, port, attribute, p_value)
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13       Display *dpy;
14       XvPortID port;
15       Atom attribute;
16       int *p_value;
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18

Arguments

20       dpy     Specifies the connection to the X server.
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22       port    Specifies  the  port,  associated  with  the given display, for
23               which the attribute values are to be returned.
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25       attribute
26               An atom that identifies the attribute to  be  queried  by  this
27               request.   Control  atoms  are  obtained  using the XInternAtom
28               request with a string from the following table.
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30       p_value Pointer to the location where the attribute value is written on
31               return.
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Description

34       XvGetPortAttribute(3)  returns  the current value of the requested port
35       attribute in the integer pointed to by p_value.  The attribute is iden‐
36       tified  using  an Atom that equates to the attribute name.  The XInter‐
37       nAtom request can be used with one of the strings  below  to  return  a
38       matching Atom.
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40       Attribute String        Type             Default
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42       "XV_ENCODING"           XvEncodingID     Server dependent
43       "XV_HUE"                [-1000...1000]   0
44       "XV_SATURATION"         [-1000...1000]   0
45       "XV_BRIGHTNESS"         [-1000...1000]   0
46       "XV_CONTRAST"           [-1000...1000]   0
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Returned Values

49       [Success]
50               Returned if XvGetPortAttribute(3) completed successfully.
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52       [XvBadExtension]
53               Returned if the Xv extension is unavailable.
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55       [XvBadAlloc]
56               Returned  if XvGetPortAttribute(3) failed to allocate memory to
57               process the request.
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Diagnostics

60       [XvBadPort]
61               Generated if the requested port does not exist.
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63       [BadMatch]
64               Generated if the requested attribute atom does not  specify  an
65               attribute supported by the adaptor.
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See Also

68       XvSetPortAttribute(3), XvPortNotify(3)
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73X Version 11                      libXv 1.0.3            XvGetPortAttribute(3)
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