<s>
X-Video	B-Application
Bitstream	I-Application
Acceleration	I-Application
(	O
XvBA	B-Application
)	O
,	O
designed	O
by	O
AMD	O
Graphics	O
for	O
its	O
Radeon	B-Device
GPU	B-Architecture
and	O
APU	B-Architecture
,	O
is	O
an	O
arbitrary	O
extension	O
of	O
the	O
X	B-Protocol
video	I-Protocol
extension	I-Protocol
(	O
Xv	O
)	O
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
on	O
Linux	B-Application
operating-systems	O
.	O
</s>
<s>
XvBA	B-Application
API	B-General_Concept
allows	O
video	O
programs	O
to	O
offload	O
portions	O
of	O
the	O
video	B-Application
decoding	I-Application
process	O
to	O
the	O
GPU	B-Architecture
video-hardware	O
.	O
</s>
<s>
Currently	O
,	O
the	O
portions	O
designed	O
to	O
be	O
offloaded	O
by	O
XvBA	B-Application
onto	O
the	O
GPU	B-Architecture
are	O
currently	O
motion	B-Algorithm
compensation	I-Algorithm
(	O
MC	O
)	O
and	O
inverse	B-General_Concept
discrete	I-General_Concept
cosine	I-General_Concept
transform	I-General_Concept
(	O
IDCT	B-General_Concept
)	O
,	O
and	O
variable-length	B-Algorithm
decoding	I-Algorithm
(	O
VLD	O
)	O
for	O
MPEG-2	B-Algorithm
,	O
MPEG-4	B-Application
ASP	I-Application
(	O
MPEG-4	B-Application
Part	I-Application
2	I-Application
,	O
including	O
Xvid	O
,	O
and	O
older	O
DivX	O
and	O
Nero	O
Digital	O
)	O
,	O
MPEG-4	B-Application
AVC	I-Application
(	O
H.264	B-Application
)	O
,	O
WMV3	B-Device
,	O
and	O
VC-1	B-Operating_System
encoded	O
video	O
.	O
</s>
<s>
XvBA	B-Application
is	O
a	O
direct	O
competitor	O
to	O
NVIDIA	O
's	O
Video	B-Application
Decode	I-Application
and	I-Application
Presentation	I-Application
API	I-Application
for	I-Application
Unix	I-Application
(	O
VDPAU	B-Application
)	O
and	O
Intel	O
's	O
Video	B-Application
Acceleration	I-Application
API	I-Application
(	O
VA	B-Application
API	I-Application
)	O
.	O
</s>
<s>
In	O
November	O
2009	O
an	O
XvBA	B-Application
backend	O
for	O
Video	B-Application
Acceleration	I-Application
API	I-Application
(	O
VA	B-Application
API	I-Application
)	O
was	O
released	O
,	O
which	O
means	O
any	O
software	O
that	O
supports	O
VA	B-Application
API	I-Application
will	O
also	O
support	O
XvBA	B-Application
.	O
</s>
<s>
On	O
24	O
February	O
2011	O
,	O
an	O
official	O
XvBA	B-Application
SDK	O
(	O
Software	B-Application
Development	I-Application
Kit	I-Application
)	O
was	O
publicly	O
released	O
alongside	O
a	O
suite	O
of	O
open	O
source	O
tools	O
by	O
AMD	O
.	O
</s>
<s>
Each	O
hardware	O
video	O
GPU	B-Architecture
capable	O
of	O
XvBA	B-Application
video	O
acceleration	O
requires	O
a	O
X11	B-Operating_System
software	O
device	B-Application
driver	I-Application
to	O
enable	O
these	O
features	O
.	O
</s>
<s>
Currently	O
only	O
AMD	O
's	O
ATI	B-Device
Radeon	I-Device
graphics	O
cards	O
hardware	O
that	O
have	O
support	O
for	O
Unified	O
Video	O
Decoder	O
version	O
2.0	O
or	O
later	O
(	O
primarily	O
the	O
Radeon	B-Device
HD	I-Device
4000	I-Device
series	I-Device
or	O
later	O
)	O
are	O
supported	O
by	O
the	O
proprietary	O
ATI	B-Application
Catalyst	I-Application
device	B-Application
driver	I-Application
.	O
</s>
