XvQueryPortAttributes __libmansuffix__ __vendorversion__ "libXv Functions"
 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 8
Specifies the connection to the X server.

 port 8
Specifies the port whose adaptor is to be queried for its list of attributes.

 p_num_attributes 8
A pointer to where the number of attributes returned in the array is written.

 DESCRIPTION
 XvQueryPortAttributes (__libmansuffix__) returns the number of attributes and an array of XvAttributes valid for the given port. The array may be
freed with
 XFree (__libmansuffix__). 
 RETURN VALUES
XvAttribute has the following structure:
.EX

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



 flags 8
May be XvGettable or XvSettable or both OR'd together indicating the
particular attribute is readable, writeable or readable and writeable.

 min_value 8
The minimum attribute values which are valid for the driver.

  max_value 8
The maximum attribute values which are valid for the driver.

 name 8
A string describing the name of the attribute that may be used
to retrieve the Atom for the particular attribute.

 DIAGNOSTICS
 [XvBadPort] 8
Generated if the requested port does not exist.

 SEE ALSO
 XvGetPortAttribute (__libmansuffix__),  XvSetPortAttribute (__libmansuffix__)