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XvQueryEncodings(3X)							     XvQueryEncodings(3X)

       XvQueryEncodings - return list of encodings for an adaptor

       #include <X11/extensions/Xvlib.h>

       XvQueryEncodings(dpy, port, p_num_encodings, pp_encoding_info)

       register Display *dpy;
       XvPortID port;
       unsigned long *p_num_encodings;
       XvEncodingInfo **pp_encoding_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  dis-
		      play  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.

       port	      Specifies  the  port  whose adaptor is to be queried for its list of encod-

		      A pointer to where the number of encodings  supported  by  the  adaptor  is

		      A  pointer  to where the list of returned encoding information is returned.
		      XvEncodingInfo has the following structure:

			  typedef struct {
			    XvEncodingID encoding_id;
			    char *name;
			    unsigned long width;
			    unsigned long height;
			    XvRational rate;
			    unsigned long num_encodings;
			  } XvEncodingInfo;

       encoding_id    Specifies the encoding-id of the encoding.   The	encoding-id  is  used  to
		      identify an encoding when a port's encoding attribute is changed.

       name	      A  pointer  to a formatted string that identifies the encoding.  The string
		      has the format "timing-signaltype".  For example "ntsc-composite".

       width,height   The width and height, in pixels, of the decoded video image.

       rate	      The field rate of the decoded video.

       The XvRational structure is used to specify a fractional number.   It  has  the	following

	   typedef struct {
	     int numerator;
	     int denominator;
	   } XvRational;

       The numerator and denominator fields specify the appropriate parts of a fractional number.

       XvQueryEncodings(3X)  returns  encoding	information  about  an adaptor.  Each encoding is
       described by the XvEncodingInfo structure described above.  The encodings  are  identified
       by an encoding-id, which can be used to set or get the encoding attribute of a port.

Returned Values
	       Returned if XvQueryEncodings(3X) completed successfully.

	       Returned if the Xv extension is unavailable.

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

	       Generated if the requested port does not exist.

See Also

XFree86 			      Version Version 4.3.0		     XvQueryEncodings(3X)
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