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Man Pages


Manual Reference Pages  -  XVQUERYENCODINGS (3)

NAME

XvQueryEncodings - return list of encodings for an adaptor

CONTENTS

Synopsis
Arguments
Description
Return Values
Diagnostics
See Also

SYNOPSIS

#include <X11/extensions/Xvlib.h>


int XvQueryEncodings(Display *dpy, XvPortID port, 

                     unsigned int *p_num_encodings, 

                     XvEncodingInfo **pp_encoding_info); 

ARGUMENTS

dpy Specifies the connection to the X server.
port Specifies the port whose adaptor is to be queried for its list of encodings.
p_num_encodings A pointer to where the number of encodings supported by the adaptor is written.
pp_encoding_info 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 structure:

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

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

DESCRIPTION

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.

RETURN VALUES

[Success] Returned if XvQueryEncodings(3) completed successfully.
[XvBadExtension] Returned if the Xv extension is unavailable.
[XvBadAlloc] Returned if XvQueryEncodings(3) failed to allocate memory to process the request.

DIAGNOSTICS

[XvBadPort] Generated if the requested port does not exist.

SEE ALSO

XvFreeEncodingInfo(3)

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X Version 11 XVQUERYENCODINGS (3) libXv 1.0.10

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