XvQueryEncodings(3) libXv Functions XvQueryEncodings(3)NAME
XvQueryEncodings - return list of encodings for an adaptor
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)X Version 11 libXv 1.0.5 XvQueryEncodings(3)
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