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+.TH XvQueryAdaptors 3X  __vendorversion__
+.\" $XFree86: xc/doc/man/Xv/XvQueryAdaptors.man,v 1.6 2001/08/17 13:27:50 dawes Exp $
+.SH Name
+XvQueryAdaptors \- return adaptor information for a screen
+.\"
+.SH Syntax
+.B #include <X11/extensions/Xvlib.h>
+.br
+.sp 1l
+.B XvQueryAdaptors(\fIdpy, win, p_num_adaptors, pp_adaptor_info\fR)
+.sp 1l 
+\fBDisplay \fI*dpy;\fR
+.br
+\fBDrawable \fI draw;\fR
+.br
+\fBint \fI*p_num_adaptors\fR;
+.br
+\fBXvAdaptorInfo \fI**pp_adaptor_info\fR;
+.br
+.\"
+.SH Arguments
+.\"
+.IP \fIdpy\fR 8
+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 hostname:number.  Using two colons
+(::) instead of one (:) indicates that DECnet is to be used
+for transport.
+.IP \fIdraw\fR 8
+Specifies a drawable of the screen for which the adaptor 
+information is desired.
+.IP \fIp_num_adaptors\fR 8
+A pointer to where the numer of adaptors for the specified screen 
+is returned.
+.IP \fIpp_adaptor_info\fR 8
+A pointer to where the list of returned adaptor information is
+returned.
+.\"
+.SH Description
+.\"
+XvQueryAdaptors(3X) returns an video adaptor information for
+the screen of the specified drawable.  The XvAdaptorInfo structure
+has the following organization:
+.EX
+
+     typedef struct {
+       XvPortID base_id;
+       unsigned long num_ports;
+       char type;
+       char *name;
+       unsigned long num_formats;
+       XvFormat *formats;
+       unsigned long num_adaptors;
+     } XvAdaptorInfo;
+
+.EE
+.IP \fIbase_id\fR 8
+The resource ID of the first adaptor port.
+.IP \fInum_ports\fR 8
+The number of ports supported by the adaptor.
+.IP \fItype\fR 8
+A bit mask with the value XvInputMask asserted if the adaptor supports video
+input, and value XvOutputMask asserted if the adaptor supports video output.
+.IP \fIname\fR 8
+A vendor specific name that identifies the adaptor.
+.IP \fInum_formats\fR 8
+The number of depth/visual id formats supported by the adaptor.
+.IP \fIformats\fR 8
+A pointer to an array of XvFormat structures.
+.PP
+The XvFormat structure has the following organization:
+.EX
+
+     typedef struct {
+       char depth;
+       unsigned long visual_id;
+     } XvFormat;
+
+.EE
+.IP \fIdepth\fR 8
+A drawable depth supported by the adaptor.
+.IP \fIvisual_id\fR 8
+A visual-id supported for the given depth by the adaptor.
+.\"
+.SH Returned Values
+.IP [Success] 8
+Returned if XvQueryAdaptors(3X) completed successfully.
+.IP [XvBadExtension] 8
+Returned if the Xv extension is unavailable.
+.IP [XvBadAlloc] 8
+Returned if XvQueryAdaptors(3X) failed to allocate memory to process
+the request.
+.SH Diagnostics
+.IP [Drawable] 8
+Returned if the requested drawable does not exist.
+.SH See Also
+XvFreeAdaptorInfo(3X)
+.\"