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Linshizhi
ffmpeg.wasm-core
Commits
de34875c
Commit
de34875c
authored
Jul 21, 2007
by
Justin Ruggles
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get rid of an ugly macro
Originally committed as revision 9771 to
svn://svn.ffmpeg.org/ffmpeg/trunk
parent
7868349a
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1 changed file
with
14 additions
and
17 deletions
+14
-17
ac3dec.c
libavcodec/ac3dec.c
+14
-17
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libavcodec/ac3dec.c
View file @
de34875c
...
...
@@ -526,8 +526,6 @@ typedef struct { /* grouped mantissas for 3-level 5-leve and 11-level quantizati
int
l11ptr
;
}
mant_groups
;
#define TRANSFORM_COEFF(tc, m, e, f) (tc) = (m) * (f)[(e)]
/* Get the transform coefficients for coupling channel and uncouple channels.
* The coupling transform coefficients starts at the the cplstrtmant, which is
* equal to endmant[ch] for fbw channels. Hence we can uncouple channels before
...
...
@@ -563,7 +561,7 @@ static int get_transform_coeffs_cpling(AC3DecodeContext *ctx, mant_groups *m)
for
(
ch
=
0
;
ch
<
ctx
->
nfchans
;
ch
++
)
if
(((
ctx
->
chincpl
)
>>
ch
)
&
1
)
{
if
((
ctx
->
dithflag
>>
ch
)
&
1
)
{
TRANSFORM_COEFF
(
cplcoeff
,
av_random
(
&
ctx
->
dith_state
)
&
0xFFFF
,
exps
[
start
],
scale_factors
)
;
cplcoeff
=
(
av_random
(
&
ctx
->
dith_state
)
&
0xFFFF
)
*
scale_factors
[
exps
[
start
]]
;
ctx
->
transform_coeffs
[
ch
+
1
][
start
]
=
cplcoeff
*
cplcos
[
ch
]
*
LEVEL_MINUS_3DB
;
}
else
ctx
->
transform_coeffs
[
ch
+
1
][
start
]
=
0
;
...
...
@@ -578,7 +576,7 @@ static int get_transform_coeffs_cpling(AC3DecodeContext *ctx, mant_groups *m)
m
->
l3_quantizers
[
2
]
=
l3_quantizers_3
[
gcode
];
m
->
l3ptr
=
0
;
}
TRANSFORM_COEFF
(
cplcoeff
,
m
->
l3_quantizers
[
m
->
l3ptr
++
],
exps
[
start
],
scale_factors
)
;
cplcoeff
=
m
->
l3_quantizers
[
m
->
l3ptr
++
]
*
scale_factors
[
exps
[
start
]]
;
break
;
case
2
:
...
...
@@ -589,11 +587,11 @@ static int get_transform_coeffs_cpling(AC3DecodeContext *ctx, mant_groups *m)
m
->
l5_quantizers
[
2
]
=
l5_quantizers_3
[
gcode
];
m
->
l5ptr
=
0
;
}
TRANSFORM_COEFF
(
cplcoeff
,
m
->
l5_quantizers
[
m
->
l5ptr
++
],
exps
[
start
],
scale_factors
)
;
cplcoeff
=
m
->
l5_quantizers
[
m
->
l5ptr
++
]
*
scale_factors
[
exps
[
start
]]
;
break
;
case
3
:
TRANSFORM_COEFF
(
cplcoeff
,
l7_quantizers
[
get_bits
(
gb
,
3
)],
exps
[
start
],
scale_factors
)
;
cplcoeff
=
l7_quantizers
[
get_bits
(
gb
,
3
)]
*
scale_factors
[
exps
[
start
]]
;
break
;
case
4
:
...
...
@@ -603,16 +601,15 @@ static int get_transform_coeffs_cpling(AC3DecodeContext *ctx, mant_groups *m)
m
->
l11_quantizers
[
1
]
=
l11_quantizers_2
[
gcode
];
m
->
l11ptr
=
0
;
}
TRANSFORM_COEFF
(
cplcoeff
,
m
->
l11_quantizers
[
m
->
l11ptr
++
],
exps
[
start
],
scale_factors
)
;
cplcoeff
=
m
->
l11_quantizers
[
m
->
l11ptr
++
]
*
scale_factors
[
exps
[
start
]]
;
break
;
case
5
:
TRANSFORM_COEFF
(
cplcoeff
,
l15_quantizers
[
get_bits
(
gb
,
4
)],
exps
[
start
],
scale_factors
)
;
cplcoeff
=
l15_quantizers
[
get_bits
(
gb
,
4
)]
*
scale_factors
[
exps
[
start
]]
;
break
;
default:
TRANSFORM_COEFF
(
cplcoeff
,
get_sbits
(
gb
,
qntztab
[
tbap
])
<<
(
16
-
qntztab
[
tbap
]),
exps
[
start
],
scale_factors
);
cplcoeff
=
(
get_sbits
(
gb
,
qntztab
[
tbap
])
<<
(
16
-
qntztab
[
tbap
]))
*
scale_factors
[
exps
[
start
]];
}
for
(
ch
=
0
;
ch
<
ctx
->
nfchans
;
ch
++
)
if
((
ctx
->
chincpl
>>
ch
)
&
1
)
...
...
@@ -661,7 +658,7 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
continue
;
}
else
{
TRANSFORM_COEFF
(
coeffs
[
i
],
av_random
(
&
ctx
->
dith_state
)
&
0xFFFF
,
exps
[
i
],
factors
)
;
coeffs
[
i
]
=
(
av_random
(
&
ctx
->
dith_state
)
&
0xFFFF
)
*
factors
[
exps
[
i
]]
;
coeffs
[
i
]
*=
LEVEL_MINUS_3DB
;
continue
;
}
...
...
@@ -674,7 +671,7 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
m
->
l3_quantizers
[
2
]
=
l3_quantizers_3
[
gcode
];
m
->
l3ptr
=
0
;
}
TRANSFORM_COEFF
(
coeffs
[
i
],
m
->
l3_quantizers
[
m
->
l3ptr
++
],
exps
[
i
],
factors
)
;
coeffs
[
i
]
=
m
->
l3_quantizers
[
m
->
l3ptr
++
]
*
factors
[
exps
[
i
]]
;
continue
;
case
2
:
...
...
@@ -685,11 +682,11 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
m
->
l5_quantizers
[
2
]
=
l5_quantizers_3
[
gcode
];
m
->
l5ptr
=
0
;
}
TRANSFORM_COEFF
(
coeffs
[
i
],
m
->
l5_quantizers
[
m
->
l5ptr
++
],
exps
[
i
],
factors
)
;
coeffs
[
i
]
=
m
->
l5_quantizers
[
m
->
l5ptr
++
]
*
factors
[
exps
[
i
]]
;
continue
;
case
3
:
TRANSFORM_COEFF
(
coeffs
[
i
],
l7_quantizers
[
get_bits
(
gb
,
3
)],
exps
[
i
],
factors
)
;
coeffs
[
i
]
=
l7_quantizers
[
get_bits
(
gb
,
3
)]
*
factors
[
exps
[
i
]]
;
continue
;
case
4
:
...
...
@@ -699,15 +696,15 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
m
->
l11_quantizers
[
1
]
=
l11_quantizers_2
[
gcode
];
m
->
l11ptr
=
0
;
}
TRANSFORM_COEFF
(
coeffs
[
i
],
m
->
l11_quantizers
[
m
->
l11ptr
++
],
exps
[
i
],
factors
)
;
coeffs
[
i
]
=
m
->
l11_quantizers
[
m
->
l11ptr
++
]
*
factors
[
exps
[
i
]]
;
continue
;
case
5
:
TRANSFORM_COEFF
(
coeffs
[
i
],
l15_quantizers
[
get_bits
(
gb
,
4
)],
exps
[
i
],
factors
)
;
coeffs
[
i
]
=
l15_quantizers
[
get_bits
(
gb
,
4
)]
*
factors
[
exps
[
i
]]
;
continue
;
default:
TRANSFORM_COEFF
(
coeffs
[
i
],
get_sbits
(
gb
,
qntztab
[
tbap
])
<<
(
16
-
qntztab
[
tbap
]),
exps
[
i
],
factors
)
;
coeffs
[
i
]
=
(
get_sbits
(
gb
,
qntztab
[
tbap
])
<<
(
16
-
qntztab
[
tbap
]))
*
factors
[
exps
[
i
]]
;
continue
;
}
}
...
...
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