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XvQueryEncodings(3X) manual page
Table of Contents
XvQueryEncodings - return list of encodings for an adaptor
#include
<X11/extensions/Xvlib.h>
XvQueryEncodings(dpy, port, p_num_encodings, pp_encoding_info)
register Display *dpy;
XvPortID port;
unsigned long *p_num_encodings;
XvEncodingInfo **pp_encoding_info;
- *dpy
- Specifies the display
screen on which the Xv Server is to accept requests from Xv clients. If
the display option is not specified, Xv uses the display screen specified
by your DISPLAY environment variable. The display option has the format
hostname:number. Using two colons (::) instead of one (:) indicates that
DECnet is to be used for transport.
- 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.
XvQueryEncodings(3X)
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.
- [Success]
- Returned if XvQueryEncodings(3X)
completed successfully.
- [XvBadExtension]
- Returned if the Xv extension is unavailable.
- [XvBadAlloc]
- Returned
if XvQueryEncodings(3X)
failed to allocate memory to process the request.
- [XvBadPort]
- Generated if the requested port does not exist.
XvFreeEncodingInfo(3X)
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- bcl
- be
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- br
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- bug
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- ca
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- mdf
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- bat_smg
- bcl
- be
- be_x_old
- bg
- bh
- bi
- bm
- bn
- bo
- bpy
- br
- bs
- bug
- bxr
- ca
- cbk_zam
- cdo
- ce
- ceb
- ch
- cho
- chr
- chy
- co
- cr
- crh
- cs
- csb
- cu
- cv
- cy
- da
- de
- diq
- dsb
- dv
- dz
- ee
- el
- eml
- eo
- es
- et
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- ext
- fa
- ff
- fi
- fiu_vro
- fj
- fo
- fr
- frp
- fur
- fy
- ga
- gan
- gd
- gl
- glk
- gn
- got
- gu
- gv
- ha
- hak
- haw
- he
- hi
- hif
- ho
- hr
- hsb
- ht
- hu
- hy
- hz
- ia
- id
- ie
- ig
- ii
- ik
- ilo
- io
- is
- it
- iu
- ja
- jbo
- jv
- ka
- kaa
- kab
- kg
- ki
- kj
- kk
- kl
- km
- kn
- ko
- kr
- ks
- ksh
- ku
- kv
- kw
- ky
- la
- lad
- lb
- lbe
- lg
- li
- lij
- lmo
- ln
- lo
- lt
- lv
- map_bms
- mdf
- mg
- mh
- mi
- mk
- ml
- mn
- mo
- mr
- mt
- mus
- my
- myv
- mzn
- na
- nah
- nap
- nds
- nds_nl
- ne
- new
- ng
- nl
- nn
- no
- nov
- nrm
- nv
- ny
- oc
- om
- or
- os
- pa
- pag
- pam
- pap
- pdc
- pi
- pih
- pl
- pms
- ps
- pt
- qu
- quality
- rm
- rmy
- rn
- ro
- roa_rup
- roa_tara
- ru
- rw
- sa
- sah
- sc
- scn
- sco
- sd
- se
- sg
- sh
- si
- simple
- sk
- sl
- sm
- sn
- so
- sr
- srn
- ss
- st
- stq
- su
- sv
- sw
- szl
- ta
- te
- tet
- tg
- th
- ti
- tk
- tl
- tlh
- tn
- to
- tpi
- tr
- ts
- tt
- tum
- tw
- ty
- udm
- ug
- uk
- ur
- uz
- ve
- vec
- vi
- vls
- vo
- wa
- war
- wo
- wuu
- xal
- xh
- yi
- yo
- za
- zea
- zh
- zh_classical
- zh_min_nan
- zh_yue
- zu
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