MirBSD manpage: XvQueryAdaptors(3)

XvQueryAdaptors(3X) UNIX Programmer's Manual  XvQueryAdaptors(3X)


     XvQueryAdaptors - return adaptor information for a screen


     #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;


     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 vari-
             able.  The display option has the format
             hostname:number.  Using two colons (::) instead of
             one (:) indicates that DECnet is to be used for

     draw    Specifies a drawable of the screen for which the
             adaptor information is desired.

             A pointer to where the number of adaptors for the
             specified screen is returned.

             A pointer to where the list of returned adaptor
             information is returned.


     XvQueryAdaptors(3X) returns an video adaptor information for
     the screen of the specified drawable.  The XvAdaptorInfo
     structure has 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.

XFree86                   Version 4.5.0                         1

XvQueryAdaptors(3X) UNIX Programmer's Manual  XvQueryAdaptors(3X)

             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 XvOut-
             putMask asserted if the adaptor supports video out-

     name    A vendor specific name that identifies the adaptor.

             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.

             A visual-id supported for the given depth by the

Returned Values

             Returned if XvQueryAdaptors(3X) completed success-

             Returned if the Xv extension is unavailable.

             Returned if XvQueryAdaptors(3X) failed to allocate
             memory to process the request.


             Returned if the requested drawable does not exist.

See Also


XFree86                   Version 4.5.0                         2

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