Manpages - XvQueryPortAttributes.3

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)*returns*the*number*of*attributes 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 indicating the particular attribute is readable, writeable or readable and writeable.

min_value

The minimum attribute values which are valid for the driver.

(no term)

:: 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.

[XvBadPort]

Generated if the requested port does not exist.

*XvGetPortAttribute*(3), *XvSetPortAttribute*(3)