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)returnsthe
numberof
attributes
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)