XvQueryPortAttributes(3)

NAME

XvQueryPortAttributes - return list of attributes of a video port

#include <X11/extensions/Xvlib.h>

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

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.

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

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 indicat: ing 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.