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)