<s>
Music	O
Player	O
Daemon	B-Operating_System
(	O
MPD	O
)	O
is	O
a	O
free	B-Application
and	O
open	B-Application
source	I-Application
music	O
player	O
server	B-Application
.	O
</s>
<s>
In	O
order	O
to	O
interact	O
with	O
it	O
,	O
a	O
client	B-Protocol
program	I-Protocol
is	O
needed	O
.	O
</s>
<s>
The	O
MPD	O
distribution	O
includes	O
mpc	B-Algorithm
,	O
a	O
simple	O
command	B-Application
line	I-Application
client	B-Protocol
.	O
</s>
<s>
The	O
MPD	O
project	O
maintains	O
a	O
list	O
of	O
vendors	O
,	O
some	O
of	O
which	O
infringe	O
the	O
GPL	B-License
.	O
</s>
<s>
Client	B-Protocol
programs	I-Protocol
communicate	O
with	O
MPD	O
to	O
manipulate	O
playback	O
,	O
the	O
playlist	O
,	O
and	O
the	O
database	O
.	O
</s>
<s>
It	O
is	O
not	O
a	O
full-featured	O
music	O
player	O
program	O
such	O
as	O
Amarok	B-Language
,	O
but	O
its	O
clients	O
can	O
serve	O
such	O
role	O
.	O
</s>
<s>
MPD	O
uses	O
a	O
flat	B-Application
file	I-Application
database	I-Application
to	O
maintain	O
the	O
basic	O
music	O
file	O
information	O
when	O
it	O
is	O
not	O
running	O
.	O
</s>
<s>
Once	O
the	O
daemon	B-Operating_System
has	O
been	O
started	O
,	O
the	O
database	O
is	O
kept	O
completely	O
in-memory	O
and	O
no	O
hard	B-Device
disk	I-Device
access	O
is	O
necessary	O
to	O
look	O
up	O
or	O
search	O
for	O
local	O
audio	O
files	O
.	O
</s>
<s>
Generally	O
,	O
music	O
files	O
must	O
be	O
located	O
in	O
a	O
sub-directory	O
of	O
the	O
music	O
directory	O
and	O
are	O
only	O
added	O
to	O
the	O
database	O
when	O
the	O
update	O
command	O
is	O
sent	O
to	O
the	O
server	B-Application
.	O
</s>
<s>
Playback	O
of	O
arbitrary	O
files	O
is	O
allowed	O
but	O
only	O
for	O
local	O
clients	O
which	O
are	O
connected	O
to	O
the	O
server	B-Application
via	O
a	O
Unix	B-Protocol
Domain	I-Protocol
Socket	I-Protocol
.	O
</s>
<s>
MPD	O
does	O
not	O
provide	O
a	O
built-in	O
tag	O
editor	O
;	O
this	O
functionality	O
is	O
handled	O
by	O
clients	O
or	O
external	O
programs	O
,	O
though	O
3rd	O
party	O
patches	O
do	O
exist	O
to	O
add	O
this	O
functionality	O
to	O
the	O
server	B-Application
.	O
</s>
<s>
The	O
client	B-Operating_System
–	I-Operating_System
server	I-Operating_System
model	I-Operating_System
provides	O
several	O
advantages	O
over	O
all-inclusive	O
music	O
players	O
.	O
</s>
<s>
Clients	O
may	O
communicate	O
with	O
the	O
server	B-Application
remotely	O
over	O
an	O
intranet	B-General_Concept
or	O
over	O
the	O
Internet	O
.	O
</s>
<s>
The	O
server	B-Application
can	O
be	O
a	O
headless	B-Application
computer	I-Application
located	O
anywhere	O
on	O
the	O
network	O
.	O
</s>
<s>
Music	O
playback	O
can	O
continue	O
seamlessly	O
when	O
not	O
using	O
X	B-Operating_System
or	O
restarting	O
X	B-Operating_System
.	O
</s>
<s>
Different	O
clients	O
can	O
be	O
used	O
for	O
different	O
purposes	O
–	O
a	O
lightweight	O
client	B-Protocol
left	O
open	O
all	O
the	O
time	O
for	O
controlling	O
playback	O
with	O
a	O
more	O
fully	O
featured	O
client	B-Protocol
used	O
for	O
intensive	O
database	O
searches	O
.	O
</s>
<s>
Plays	O
Ogg	B-Algorithm
Vorbis	I-Algorithm
,	O
FLAC	B-Application
,	O
Opus	B-Algorithm
,	O
WavPack	B-Application
,	O
MP2	O
,	O
MP3	B-Application
,	O
MP4/AAC	O
,	O
MOD	O
,	O
Musepack	B-Algorithm
,	O
wave	O
files	O
and	O
any	O
other	O
files	O
supported	O
by	O
FFmpeg	B-Library
.	O
</s>
<s>
Remotely	O
control	O
MPD	O
over	O
a	O
network	O
(	O
IPv4	B-Protocol
and	O
IPv6	B-Protocol
supported	O
)	O
.	O
</s>
<s>
Plays	O
FLAC	B-Application
,	O
OggFLAC	O
,	O
MP3	B-Application
and	O
Ogg	B-Algorithm
Vorbis	I-Algorithm
HTTP	O
streams	O
.	O
</s>
<s>
Reads	O
and	O
caches	O
metadata	O
information	O
(	O
ID3	O
:	O
ID3v1	O
and	O
ID3v2	O
)	O
,	O
Vorbis	B-Algorithm
Comments	O
,	O
and	O
MP4	O
Metadata	O
.	O
</s>
<s>
Buffer	B-General_Concept
support	O
for	O
playback	O
(	O
prevents	O
skipping	O
due	O
to	O
high	O
load	O
or	O
network	O
latency	O
)	O
.	O
</s>
<s>
Native	O
Zeroconf	B-Application
support	O
.	O
</s>
<s>
Support	O
for	O
ALSA	B-Application
,	O
PulseAudio	B-Library
,	O
PipeWire	B-Application
,	O
OSS	B-Library
,	O
MVP	B-Application
,	O
JACK	B-Application
,	O
Windows	B-Application
,	O
and	O
macOS	B-Application
.	O
</s>
<s>
Can	O
be	O
used	O
as	O
a	O
source	O
for	O
an	O
Icecast	B-Application
stream	O
,	O
in	O
Ogg	B-Algorithm
Vorbis	I-Algorithm
and	O
MP3	B-Application
.	O
</s>
<s>
Other	O
formats	O
can	O
be	O
converted	O
to	O
Ogg/MP3	O
on	O
the	O
fly	O
before	O
output	O
to	O
the	O
stream	O
server	B-Application
.	O
</s>
<s>
Built-in	O
HTTP	B-General_Concept
streaming	I-General_Concept
server	B-Application
,	O
capable	O
of	O
producing	O
Ogg	B-Algorithm
Vorbis	I-Algorithm
and	O
MP3	B-Application
streams	O
of	O
a	O
chosen	O
quality	O
on-the-fly	O
.	O
</s>
<s>
Independent	O
of	O
a	O
GUI	B-Application
.	O
</s>
<s>
Music	O
will	O
continue	O
playing	O
whether	O
a	O
front-end	B-Architecture
is	O
open	O
or	O
not	O
,	O
and	O
will	O
continue	O
playing	O
even	O
if	O
the	O
X	B-Operating_System
server	B-Application
is	O
killed	O
.	O
</s>
<s>
MPD	O
has	O
a	O
variety	O
of	O
front-ends	B-Architecture
which	O
communicate	O
with	O
the	O
server	B-Application
using	O
a	O
custom	O
protocol	O
over	O
a	O
TCP	B-Protocol
connection	O
.	O
</s>
<s>
mpc	B-Algorithm
(	O
part	O
of	O
the	O
MPD	O
project	O
)	O
is	O
a	O
simple	O
command	B-Application
line	I-Application
interface	I-Application
to	O
most	O
of	O
the	O
server	B-Application
's	O
functions	O
.	O
</s>
<s>
ncmpc	B-Protocol
(	O
part	O
of	O
the	O
MPD	O
project	O
)	O
is	O
a	O
more	O
fully	O
featured	O
ncurses	B-Language
client	B-Protocol
similar	O
in	O
concept	O
to	O
MOC	B-Language
.	O
</s>
<s>
ncmpcpp	O
is	O
another	O
ncurses	B-Language
client	B-Protocol
that	O
clones	O
'	O
s	O
functionality	O
,	O
but	O
includes	O
new	O
features	O
,	O
such	O
as	O
a	O
tag	O
editor	O
.	O
</s>
<s>
Practical	O
Music	O
Search	O
is	O
another	O
ncurses	B-Language
client	B-Protocol
with	O
a	O
Vim-like	O
interface	O
.	O
</s>
<s>
fmui	O
is	O
a	O
terminal	O
user	B-Application
interface	I-Application
created	O
with	O
fzf	O
and	O
mpc	B-Algorithm
.	O
</s>
<s>
Bragi-MPD	O
full	O
featured	O
,	O
mobile	O
friendly	O
,	O
fully	O
client	B-Protocol
side	O
,	O
HTML5	O
web-client	O
capable	O
of	O
controlling	O
multiple	O
instances	O
and	O
multiple	O
outputs	O
per	O
MPD	O
instance	O
.	O
</s>
<s>
Ario	O
is	O
GTK+	B-Application
-based	O
and	O
uses	O
tabs	O
in	O
its	O
interface	O
.	O
</s>
<s>
Cantata	O
runs	O
on	O
Windows	B-Application
,	O
macOS	B-Application
and	O
Linux	B-Application
,	O
and	O
uses	O
Qt	B-Language
5	O
to	O
manage	O
the	O
library	O
or	O
playlists	O
,	O
with	O
extras	O
like	O
tags	O
editor	O
,	O
lyrics	O
and	O
cover	O
fetching	O
from	O
Internet	O
,	O
and	O
support	O
for	O
mass	B-Device
storage	I-Device
devices	I-Device
.	O
</s>
<s>
Cantata	O
gained	O
some	O
traction	O
from	O
being	O
made	O
the	O
standard	O
audio	O
player	O
of	O
Linux	B-Application
distribution	O
Kubuntu	B-Application
in	O
October	O
2017	O
at	O
the	O
expense	O
of	O
audio	O
player	O
Amarok	B-Language
.	O
</s>
<s>
Gimmix	O
provides	O
a	O
simple	O
interface	O
with	O
a	O
very	O
small	O
memory	B-General_Concept
footprint	O
.	O
</s>
<s>
gmpc	O
is	O
the	O
oldest	O
maintained	O
gtk+	B-Application
-2	O
(	O
gtk+	B-Application
-3	O
development	O
version	O
)	O
client	B-Protocol
,	O
it	O
provides	O
many	O
different	O
ways	O
of	O
exploring	O
the	O
music	O
collection	O
and	O
rich	O
metadata	O
like	O
lyrics	O
,	O
covers	O
,	O
artist/album	O
information	O
,	O
artist/album/backdrop	O
images	O
,	O
similar	O
artists	O
and	O
more	O
.	O
</s>
<s>
The	O
client	B-Protocol
aims	O
to	O
be	O
rich	O
in	O
features	O
,	O
but	O
still	O
lightweight	O
enough	O
to	O
have	O
constantly	O
running	O
on	O
low	O
end	O
hardware	O
.	O
</s>
<s>
Intelligent	O
Music	O
Player	O
Client	B-Protocol
(	O
IMPC	O
)	O
uses	O
GTK+	O
3.0	O
and	O
supports	O
loading	O
related	O
information	O
(	O
articles	O
,	O
covers	O
,	O
images	O
)	O
with	O
actually	O
playing	O
song	O
and	O
it	O
learns	O
to	O
classify	O
related	O
content	O
.	O
</s>
<s>
mpdlirc	O
interfaces	O
MPD	O
via	O
an	O
infrared	O
remote	B-Protocol
control	I-Protocol
.	O
</s>
<s>
Qmobilempd	O
provides	O
a	O
Qt4	B-Language
client	B-Protocol
especially	O
for	O
mobile	O
devices	O
like	O
Symbian	O
.	O
</s>
<s>
Qmpdplasmoid	O
provides	O
a	O
client	B-Protocol
directly	O
embedded	O
into	O
the	O
KDE	O
desktop	O
.	O
</s>
<s>
Sonata	O
uses	O
GTK+	B-Application
to	O
provide	O
a	O
GUI	B-Application
for	O
playing	O
files	O
and	O
managing	O
playlists	O
.	O
</s>
<s>
Simple	O
clients	O
can	O
script	O
the	O
program	O
to	O
issue	O
commands	O
to	O
the	O
server	B-Application
.	O
</s>
<s>
Some	O
clients	O
provide	O
an	O
HTML	B-Language
or	O
AJAX	B-Device
user	B-Application
interface	I-Application
and	O
can	O
be	O
located	O
on	O
the	O
same	O
computer	O
as	O
the	O
server	B-Application
,	O
requiring	O
only	O
a	O
browser	O
be	O
installed	O
on	O
the	O
client	B-Protocol
machine	I-Protocol
.	O
</s>
<s>
There	O
is	O
a	O
client	B-Protocol
implemented	O
as	O
a	O
Firefox	B-Application
add-on	O
,	O
one	O
as	O
a	O
Xfce	B-Language
panel	O
plugin	O
,	O
and	O
one	O
as	O
a	O
Wii	O
application	O
,	O
and	O
one	O
as	O
a	O
for	O
Windows	B-Application
8/Windows	O
RT	O
.	O
</s>
<s>
Libraries	B-Library
exist	O
to	O
interface	O
with	O
MPD	O
from	O
many	O
programming	O
languages	O
,	O
including	O
C	B-Language
,	O
Python	B-Language
,	O
Ruby	B-Language
,	O
Perl	B-Language
,	O
Lua	B-Language
and	O
Haskell	B-Language
.	O
</s>
<s>
is	O
an	O
Emacs	B-Operating_System
Lisp	I-Operating_System
library	O
allowing	O
MPD	O
to	O
be	O
controlled	O
from	O
Emacs	B-Application
.	O
</s>
