<s>
AVFoundation	B-Operating_System
is	O
a	O
multimedia	B-Library
framework	I-Library
with	O
APIs	B-Application
in	O
Objective-C	B-Language
and	O
Swift	B-Application
,	O
which	O
provides	O
high-level	O
services	O
for	O
working	O
with	O
time-based	O
audiovisual	O
media	O
on	O
Apple	O
Darwin-based	O
operating	B-General_Concept
systems	I-General_Concept
:	O
iOS	B-Application
,	O
macOS	B-Application
,	O
tvOS	B-Operating_System
,	O
and	O
watchOS	B-Device
.	O
</s>
<s>
It	O
was	O
first	O
introduced	O
in	O
iOS	B-Operating_System
4	I-Operating_System
and	O
has	O
seen	O
significant	O
changes	O
in	O
iOS	B-Operating_System
5	I-Operating_System
and	O
iOS	B-Operating_System
6	I-Operating_System
.	O
</s>
<s>
Starting	O
with	O
Mac	B-Application
OS	I-Application
X	I-Application
Lion	I-Application
,	O
it	O
is	O
now	O
the	O
default	O
media	B-Library
framework	I-Library
for	O
the	O
macOS	B-Application
platform	O
.	O
</s>
<s>
As	O
a	O
component	O
of	O
AVFoundation	B-Operating_System
,	O
AVKit	O
is	O
an	O
API	B-Application
that	O
comes	O
with	O
OS	B-Operating_System
X	I-Operating_System
Mavericks	I-Operating_System
10.9	O
+	O
and	O
can	O
be	O
used	O
with	O
Xcode	B-Operating_System
5.0	O
+	O
for	O
developing	O
media	O
player	O
software	O
for	O
Mac	O
.	O
</s>
<s>
The	O
AVKit	O
software	B-Architecture
framework	I-Architecture
is	O
replacing	O
QTKit	B-Operating_System
which	O
was	O
deprecated	B-General_Concept
in	O
OS	B-Operating_System
X	I-Operating_System
Mavericks	I-Operating_System
,	O
and	O
was	O
discontinued	O
with	O
the	O
release	O
of	O
macOS	B-Device
Catalina	I-Device
.	O
</s>
