NAME

       XvQueryPortAttributes - return list of attributes of a video port

SYNOPSIS

       #include <X11/extensions/Xvlib.h>

       XvAttribute* XvQueryPortAttributes(Display *dpy,
                        XvPortID port,  int *p_num_attributes);

ARGUMENTS

       dpy     Specifies the connection to the X server.

       port    Specifies the port whose adaptor is to be queried for its list of attributes.

       p_num_attributes
               A pointer to where the number of attributes returned in the array is written.

DESCRIPTION

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

RETURN VALUES

       XvAttribute has the following structure:

           typedef struct {
             int flags;
             int min_value;
             int max_value;
             char *name;
           } XvAttribute;

       flags   May be XvGettable or XvSettable or both OR'd together  indicating  the  particular
               attribute is readable, writeable or readable and writeable.

       min_value
               The minimum attribute values which are valid for the driver.

               The maximum attribute values which are valid for the driver.

       name    A  string  describing  the  name of the attribute that may be used to retrieve the
               Atom for the particular attribute.

DIAGNOSTICS

       [XvBadPort]
               Generated if the requested port does not exist.

SEE ALSO

       XvGetPortAttribute(3), XvSetPortAttribute(3)