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XvQueryEncodings(3)			 libXv Functions		      XvQueryEncodings(3)

       XvQueryEncodings - return list of encodings for an adaptor

       #include <X11/extensions/Xvlib.h>

       int XvQueryEncodings(Display *dpy, XvPortID port,
			    unsigned int *p_num_encodings,
			    XvEncodingInfo **pp_encoding_info);

       dpy     Specifies the connection to the X server.

       port    Specifies the port whose adaptor is to be queried for its list of encodings.

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

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

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

	       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".

	       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(3)  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 if XvQueryEncodings(3) completed successfully.

	       Returned if the Xv extension is unavailable.

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

	       Generated if the requested port does not exist.


X Version 11				   libXv 1.0.9			      XvQueryEncodings(3)
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