<s>
HTML5	B-Language
Audio	I-Language
is	O
a	O
subject	O
of	O
the	O
HTML5	B-Application
specification	O
,	O
incorporating	O
audio	O
input	O
,	O
playback	O
,	O
and	O
synthesis	O
,	O
as	O
well	O
as	O
speech	B-Application
to	I-Application
text	I-Application
,	O
in	O
the	O
browser	O
.	O
</s>
<s>
The	O
adoption	O
of	O
HTML5	B-Language
audio	I-Language
,	O
as	O
with	O
HTML5	B-Application
video	O
,	O
has	O
become	O
polarized	O
between	O
proponents	O
of	O
free	B-Application
and	O
patent-encumbered	O
formats	O
.	O
</s>
<s>
In	O
2007	O
,	O
the	O
recommendation	O
to	O
use	O
Vorbis	B-Algorithm
was	O
retracted	B-Application
from	O
the	O
specification	O
by	O
the	O
W3C	O
together	O
with	O
that	O
to	O
use	O
Ogg	B-Algorithm
Theora	I-Algorithm
,	O
citing	O
the	O
lack	O
of	O
a	O
format	O
accepted	O
by	O
all	O
the	O
major	O
browser	O
vendors	O
.	O
</s>
<s>
Apple	O
and	O
Microsoft	O
support	O
the	O
ISO/IEC	O
-defined	O
formats	O
AAC	B-Application
and	O
the	O
older	O
MP3	B-Application
.	O
</s>
<s>
Mozilla	B-Operating_System
and	O
Opera	B-Application
support	O
the	O
free	B-Application
and	O
open	B-Application
,	O
royalty-free	O
Vorbis	B-Algorithm
format	O
in	O
Ogg	O
and	O
WebM	B-Application
containers	O
,	O
and	O
criticize	O
the	O
patent-encumbered	O
nature	O
of	O
MP3	B-Application
and	O
AAC	B-Application
,	O
which	O
are	O
guaranteed	O
to	O
be	O
“	O
non-free	O
”	O
.	O
</s>
<s>
Google	B-Application
has	O
so	O
far	O
provided	O
support	O
for	O
all	O
common	O
formats	O
.	O
</s>
<s>
Most	O
AAC	B-Application
files	I-Application
with	O
finite	O
length	O
are	O
wrapped	O
in	O
an	O
MPEG-4	O
container	O
(	O
.mp4	O
,	O
.m4a	O
)	O
,	O
which	O
is	O
supported	O
natively	O
in	O
Internet	B-Application
Explorer	I-Application
,	O
Safari	B-Application
,	O
and	O
Chrome	B-Application
,	O
and	O
supported	O
by	O
the	O
OS	O
in	O
Firefox	B-Application
and	O
Opera	B-Application
.	O
</s>
<s>
Most	O
AAC	B-Application
live	O
streams	O
with	O
infinite	O
length	O
are	O
wrapped	O
in	O
an	O
Audio	O
Data	O
Transport	O
Stream	O
container	O
(	O
.aac	B-Application
,	O
.adts	O
)	O
,	O
which	O
is	O
supported	O
by	O
Chrome	B-Application
,	O
Safari	B-Application
,	O
Firefox	B-Application
and	O
Edge	B-Application
.	O
</s>
<s>
Many	O
browsers	O
also	O
support	O
uncompressed	O
PCM	B-Algorithm
audio	I-Algorithm
in	O
a	O
WAVE	O
container	O
.	O
</s>
<s>
In	O
2012	O
,	O
the	O
free	B-Application
and	O
open	B-Application
royalty-free	O
Opus	B-Algorithm
format	I-Algorithm
was	O
released	O
and	O
standardized	O
by	O
IETF	O
.	O
</s>
<s>
It	O
is	O
supported	O
by	O
Mozilla	B-Operating_System
,	O
Google	B-Application
,	O
Opera	B-Application
and	O
Edge	B-Application
.	O
</s>
<s>
The	O
Web	B-Language
Audio	I-Language
API	O
specification	O
developed	O
by	O
W3C	O
describes	O
a	O
high-level	O
JavaScript	O
API	O
for	O
processing	O
and	O
synthesizing	O
audio	O
in	O
web	O
applications	O
.	O
</s>
<s>
Mozilla	B-Application
's	I-Application
Firefox	I-Application
browser	I-Application
implements	O
a	O
similar	O
Audio	O
Data	O
API	O
extension	O
since	O
version	O
4	O
,	O
implemented	O
in	O
2010	O
and	O
released	O
in	O
2011	O
,	O
but	O
Mozilla	B-Operating_System
warns	O
it	O
is	O
non-standard	O
and	O
deprecated	O
,	O
and	O
recommends	O
the	O
Web	B-Language
Audio	I-Language
API	O
instead	O
.	O
</s>
<s>
The	O
is	O
also	O
considering	O
the	O
MediaStream	O
Processing	O
API	O
specification	O
developed	O
by	O
Mozilla	B-Operating_System
.	O
</s>
<s>
In	O
addition	O
to	O
audio	O
mixing	O
and	O
processing	O
,	O
it	O
covers	O
more	O
general	O
media	O
streaming	O
,	O
including	O
synchronization	O
with	O
HTML	O
elements	O
,	O
capture	O
of	O
audio	O
and	O
video	O
streams	O
,	O
and	O
peer-to-peer	B-Protocol
routing	I-Protocol
of	O
such	O
media	O
streams	O
.	O
</s>
<s>
The	O
Web	O
Speech	B-Language
API	I-Language
aims	O
to	O
provide	O
an	O
alternative	O
input	O
method	O
for	O
web	O
applications	O
(	O
without	O
using	O
a	O
keyboard	O
)	O
.	O
</s>
<s>
With	O
this	O
API	O
,	O
developers	O
can	O
give	O
web	O
apps	O
the	O
ability	O
to	O
transcribe	O
voice	B-Application
to	I-Application
text	I-Application
,	O
from	O
the	O
computer	O
's	O
microphone	O
.	O
</s>
<s>
The	O
API	O
itself	O
is	O
agnostic	O
of	O
the	O
underlying	O
speech	B-Application
recognition	I-Application
implementation	O
and	O
can	O
support	O
both	O
server	O
based	O
as	O
well	O
as	O
embedded	O
recognizers	O
.	O
</s>
<s>
Google	B-Application
integrated	O
this	O
feature	O
into	O
Google	B-Application
Chrome	I-Application
in	O
March	O
2011	O
.	O
</s>
