<s>
PortAudio	B-Language
is	O
an	O
open-source	B-Application
computer	B-Library
library	I-Library
for	O
audio	O
playback	O
and	O
recording	O
.	O
</s>
<s>
It	O
is	O
a	O
cross-platform	B-Operating_System
library	O
,	O
so	O
programs	O
using	O
it	O
can	O
run	O
on	O
many	O
different	O
computer	B-General_Concept
operating	I-General_Concept
systems	I-General_Concept
,	O
including	O
Windows	O
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
and	O
Linux	B-Application
.	O
</s>
<s>
PortAudio	B-Language
supports	O
Core	B-Operating_System
Audio	I-Operating_System
,	O
ALSA	B-Application
,	O
and	O
MME	O
,	O
DirectSound	B-Device
,	O
ASIO	B-Library
and	O
WASAPI	O
on	O
Windows	O
.	O
</s>
<s>
Like	O
other	O
libraries	O
whose	O
primary	O
goal	O
is	O
portability	O
,	O
PortAudio	B-Language
is	O
written	O
in	O
the	O
C	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
It	O
has	O
also	O
been	O
implemented	O
in	O
the	O
languages	O
PureBasic	B-Application
and	O
Lazarus/Free	O
Pascal	O
.	O
</s>
<s>
PortAudio	B-Language
is	O
based	O
on	O
a	O
callback	O
paradigm	O
,	O
similar	O
to	O
JACK	B-Application
and	O
ASIO	B-Library
.	O
</s>
<s>
PortAudio	B-Language
is	O
part	O
of	O
the	O
PortMedia	B-Application
project	O
,	O
which	O
aims	O
to	O
provide	O
a	O
set	O
of	O
platform-independent	B-Operating_System
libraries	O
for	O
music	O
software	O
.	O
</s>
<s>
The	O
free	O
audio	B-Application
editor	I-Application
Audacity	B-Language
uses	O
the	O
PortAudio	B-Language
library	O
,	O
and	O
so	O
does	O
JACK	B-Application
on	O
the	O
Windows	O
platform	O
.	O
</s>
