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MAN page from PCLinuxOS libxv1-devel-1.0.1-3.pclo2005.mde.i586.rpm

XvQueryAdaptors

Section: Misc. Reference Manual Pages (3x)
Updated: libXv 1.0.1
Index 

Name

XvQueryAdaptors - 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 theXv Server is to accept requests from Xv clients. If thedisplay option is not specified, Xv uses the display screenspecified by your DISPLAY environment variable. The displayoption has the format hostname:number. Using two colons(::) instead of one (:) indicates that DECnet is to be usedfor transport.
draw
Specifies a drawable of the screen for which the adaptor information 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 isreturned.
 

Description

XvQueryAdaptors(3x) returns an video adaptor information forthe screen of the specified drawable. The XvAdaptorInfo structurehas the following 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 videoinput, 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 processthe request.
 

Diagnostics

[Drawable]
Returned if the requested drawable does not exist.
 

See Also

XvFreeAdaptorInfo(3x)


 

Index

Name
Syntax
Arguments
Description
Returned Values
Diagnostics
See Also

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