56 lines
1.6 KiB
Groff
56 lines
1.6 KiB
Groff
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.TH XvQueryPortAttributes __libmansuffix__ __vendorversion__ "libXv Functions"
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.SH NAME
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XvQueryPortAttributes \- return list of attributes of a video port
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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 "XvAttribute* XvQueryPortAttributes(Display *" dpy ","
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.BI " XvPortID " port ", int *" p_num_attributes ");"
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.fi
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.SH ARGUMENTS
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.\"
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.IP \fIdpy\fR 8
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Specifies the connection to the X server.
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.IP \fIport\fR 8
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Specifies the port whose adaptor is to be queried for its list of attributes.
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.IP \fIp_num_attributes\fR 8
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A pointer to where the number of attributes returned in the array is written.
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.\"
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.SH DESCRIPTION
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.BR XvQueryPortAttributes (__libmansuffix__) returns the number of attributes
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and an array of XvAttributes valid for the given port. The array may be
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freed with
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.BR XFree (__libmansuffix__).
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.SH RETURN VALUES
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XvAttribute has the following structure:
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.EX
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typedef struct {
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int flags;
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int min_value;
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int max_value;
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char *name;
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} XvAttribute;
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.EE
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.IP \fIflags\fR 8
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May be XvGettable or XvSettable or both OR'd together indicating the
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particular attribute is readable, writeable or readable and writeable.
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.IP \fImin_value\fR 8
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The minimum attribute values which are valid for the driver.
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.IP \fI max_value\fR 8
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The maximum attribute values which are valid for the driver.
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.IP \fIname\fR 8
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A string describing the name of the attribute that may be used
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to retrieve the Atom for the particular attribute.
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.\"
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.SH DIAGNOSTICS
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.IP [XvBadPort] 8
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Generated if the requested port does not exist.
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.\"
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.SH SEE ALSO
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.BR XvGetPortAttribute (__libmansuffix__),
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.BR XvSetPortAttribute (__libmansuffix__)
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