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Linshizhi
ffmpeg.wasm-core
Commits
f21fb76b
Commit
f21fb76b
authored
Jun 21, 2011
by
Justin Ruggles
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ac3enc: remove a branch in asym_quant() by doing 2 shifts
parent
0e4dbe29
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8 deletions
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-8
ac3enc.c
libavcodec/ac3enc.c
+2
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libavcodec/ac3enc.c
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f21fb76b
...
@@ -1123,15 +1123,9 @@ static inline int sym_quant(int c, int e, int levels)
...
@@ -1123,15 +1123,9 @@ static inline int sym_quant(int c, int e, int levels)
*/
*/
static
inline
int
asym_quant
(
int
c
,
int
e
,
int
qbits
)
static
inline
int
asym_quant
(
int
c
,
int
e
,
int
qbits
)
{
{
int
lshift
,
m
,
v
;
int
m
,
v
;
lshift
=
e
+
qbits
-
24
;
v
=
(((
c
<<
e
)
>>
(
24
-
qbits
))
+
1
)
>>
1
;
if
(
lshift
>=
0
)
v
=
c
<<
lshift
;
else
v
=
c
>>
(
-
lshift
);
/* rounding */
v
=
(
v
+
1
)
>>
1
;
m
=
(
1
<<
(
qbits
-
1
));
m
=
(
1
<<
(
qbits
-
1
));
if
(
v
>=
m
)
if
(
v
>=
m
)
v
=
m
-
1
;
v
=
m
-
1
;
...
...
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