XvQueryPortAttributes(3) manual page

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