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XvQueryAdaptors(3)		libXv Functions		    XvQueryAdaptors(3)

NAME
       XvQueryAdaptors - return	adaptor	information for	a screen

SYNOPSIS
       #include	<X11/extensions/Xvlib.h>

       int XvQueryAdaptors(Display *dpy, Window	window,
			   unsigned int	*p_num_adaptors,
			   XvAdaptorInfo **pp_adaptor_info);

ARGUMENTS
       dpy     Specifies the connection	to the X server.

       window  Specifies a window of the screen	for which the adaptor informa-
	       tion is desired.

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

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

DESCRIPTION
       XvQueryAdaptors(3)
	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.

       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.	 In Xv protocol	2.2 and	later,
	       there are 3 new bits defined  -	XvVideoMask,  XvStillMask  and
	       XvImageMask  indicating	that  the adaptor is capable of	video,
	       still or	image primitives respectively.

       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.

RETURN VALUES
       [Success]
	       Returned	if XvQueryAdaptors(3) completed	successfully.

       [XvBadExtension]
	       Returned	if the Xv extension is unavailable.

       [XvBadAlloc]
	       Returned	if XvQueryAdaptors(3) failed  to  allocate  memory  to
	       process the request.

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

SEE ALSO
       XvFreeAdaptorInfo(3)

X Version 11			 libXv 1.0.11		    XvQueryAdaptors(3)

NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | RETURN VALUES | DIAGNOSTICS | SEE ALSO

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