XvQueryAdaptors(3x)XvQueryAdaptors(3x)NameXvQueryAdaptors - return adaptor information for a screen
Syntax
#include <X11/extensions/Xvlib.h>
XvQueryAdaptors(dpy, win, p_num_adaptors, pp_adaptor_info)
Display *dpy;
Drawable draw;
int *p_num_adaptors;
XvAdaptorInfo **pp_adaptor_info;
Arguments
dpy Specifies the display screen on which the Xv Server is to
accept requests from Xv clients. If the display option is not
specified, Xv uses the display screen specified by your DISPLAY
environment variable. The display option has the format host‐
name:number. Using two colons (::) instead of one (:) indi‐
cates that DECnet is to be used for transport.
draw Specifies a drawable of the screen for which the adaptor infor‐
mation is desired.
p_num_adaptors
A pointer to where the numer of adaptors for the specified
screen is returned.
pp_adaptor_info
A pointer to where the list of returned adaptor information is
returned.
DescriptionXvQueryAdaptors(3x) returns an video adaptor information for the screen
of the specified drawable. The XvAdaptorInfo structure has the follow‐
ing organization:
typedef struct {
XvPortID base_id;
unsigned long num_ports;
char type;
char *name;
unsigned long num_formats;
XvFormat *formats;
unsigned long num_adaptors;
} XvAdaptorInfo;
base_id The resource ID of the first adaptor port.
num_ports
The number of ports supported by the adaptor.
type A bit mask with the value XvInputMask asserted if the adaptor
supports video input, and value XvOutputMask asserted if the
adaptor supports video output.
name A vendor specific name that identifies the adaptor.
num_formats
The number of depth/visual id formats supported by the adaptor.
formats A pointer to an array of XvFormat structures.
The XvFormat structure has the following organization:
typedef struct {
char depth;
unsigned long visual_id;
} XvFormat;
depth A drawable depth supported by the adaptor.
visual_id
A visual-id supported for the given depth by the adaptor.
Returned Values
[Success]
Returned if XvQueryAdaptors(3x) completed successfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvQueryAdaptors(3x) failed to allocate memory to
process the request.
Diagnostics
[Drawable]
Returned if the requested drawable does not exist.
See AlsoXvFreeAdaptorInfo(3x)X Version 11 libXv 1.0.1 XvQueryAdaptors(3x)
