1XvQueryPortAttributes(3)        libXv Functions       XvQueryPortAttributes(3)
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NAME

6       XvQueryPortAttributes - return list of attributes of a video port
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SYNOPSIS

9       #include <X11/extensions/Xvlib.h>
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11       XvAttribute* XvQueryPortAttributes(Display *dpy,
12                        XvPortID port,  int *p_num_attributes);
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ARGUMENTS

15       dpy     Specifies the connection to the X server.
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17       port    Specifies  the port whose adaptor is to be queried for its list
18               of attributes.
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20       p_num_attributes
21               A pointer to where the number of  attributes  returned  in  the
22               array is written.
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DESCRIPTION

25       XvQueryPortAttributes(3)returnsthenumberofattributes  and  an  array of
26       XvAttributes valid for the given port.  The array  may  be  freed  with
27       XFree(3).
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RETURN VALUES

30       XvAttribute has the following structure:
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32           typedef struct {
33             int flags;
34             int min_value;
35             int max_value;
36             char *name;
37           } XvAttribute;
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40       flags   May  be XvGettable or XvSettable or both OR'd together indicat‐
41               ing the particular attribute is readable, writeable or readable
42               and writeable.
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44       min_value
45               The minimum attribute values which are valid for the driver.
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47               The maximum attribute values which are valid for the driver.
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49       name    A  string describing the name of the attribute that may be used
50               to retrieve the Atom for the particular attribute.
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DIAGNOSTICS

53       [XvBadPort]
54               Generated if the requested port does not exist.
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SEE ALSO

57       XvGetPortAttribute(3), XvSetPortAttribute(3)
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61X Version 11                     libXv 1.0.11         XvQueryPortAttributes(3)
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