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.TH XvQueryExtension __libmansuffix__ __vendorversion__ "libXv Functions"
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.SH NAME
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XvQueryExtension \- return version and release of extension
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.\"
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.SH SYNOPSIS
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.B #include <X11/extensions/Xvlib.h>
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.sp
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.nf
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.BI "int XvQueryExtension(Display *" dpy ", unsigned int *" p_version ","
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.BI " unsigned int *" p_revision ","
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.BI " unsigned int *" p_request_base ","
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.BI " unsigned int *" p_event_base ","
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.BI " unsigned int *" p_error_base ");"
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.fi
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.SH ARGUMENTS
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.\"
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.IP \fIdpy\fR 15
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Specifies the connection to the X server.
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.IP \fIp_version\fR 15
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Pointer to where the current version number of the \fIXv\fP video extension
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is written.
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.IP \fIp_revision\fR 15
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Pointer to where the revision number of the \fIXv\fP video extension
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is written.
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.IP \fIp_request_base\fR 15
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Pointer to where the extension major request number is returned
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.IP \fIp_event_base\fR 15
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Pointer to where the extension event base is returned
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.IP \fIp_error_base\fR 15
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Pointer to where the extension error base is returned
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.\"
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.SH DESCRIPTION
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.\"
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.PP
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.BR XvQueryExtension (__libmansuffix__)
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returns the version and release numbers for the Xv video extension
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currently loaded on the system. The extension major request number,
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event base, and error base are also returned.
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.\"
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.SH RETURN VALUES
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.IP [Success] 8
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Returned if
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.BR XvQueryExtension (__libmansuffix__)
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completed successfully.
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.IP [XvBadExtension] 8
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Returned if the Xv video extension is not available for the named display.
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.IP [XvBadAlloc] 8
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Returned if
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.BR XvQueryExtension (__libmansuffix__)
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failed to allocate memory to process the request.
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.SH SEE ALSO
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.BR Xv (__libmansuffix__)
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