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Mathis Rosenhauer
libaec
Commits
fef349b5
Commit
fef349b5
authored
Sep 19, 2012
by
Mathis Rosenhauer
Committed by
Thomas Jahns
Feb 19, 2013
Browse files
Reformatting
parent
dfaddade
Changes
8
Expand all
Hide whitespace changes
Inline
Side-by-side
src/aec.c
View file @
fef349b5
...
...
@@ -11,7 +11,7 @@
int
main
(
int
argc
,
char
*
argv
[])
{
aec_stream
strm
;
struct
aec_stream
strm
;
uint8_t
*
in
;
uint8_t
*
out
;
int
chunk
,
total_out
,
status
,
c
;
...
...
src/decode.c
View file @
fef349b5
...
...
@@ -20,7 +20,7 @@ typedef struct internal_state {
int
id
;
/* option ID */
int
id_len
;
/* bit length of code option identification key */
int
*
id_table
;
/* table maps IDs to states */
void
(
*
put_sample
)(
aec_stream
p
,
int64_t
);
void
(
*
put_sample
)(
struct
aec_stream
*
,
int64_t
);
int
ref_int
;
/* reference sample is every ref_int samples */
int64_t
last_out
;
/* previous output for post-processing */
int64_t
xmin
;
/* minimum integer for post-processing */
...
...
@@ -42,8 +42,7 @@ typedef struct internal_state {
}
decode_state
;
/* decoding table for the second-extension option */
static
const
int
second_extension
[
92
][
2
]
=
{
static
const
int
second_extension
[
92
][
2
]
=
{
{
0
,
0
},
{
1
,
1
},
{
1
,
1
},
{
2
,
3
},
{
2
,
3
},
{
2
,
3
},
...
...
@@ -59,8 +58,7 @@ static const int second_extension[92][2] =
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
},
{
12
,
78
}
};
enum
{
enum
{
M_ID
=
0
,
M_SPLIT
,
M_SPLIT_FS
,
...
...
@@ -75,7 +73,7 @@ enum
M_UNCOMP_COPY
,
};
static
void
put_msb_32
(
aec_stream
p
strm
,
int64_t
data
)
static
void
put_msb_32
(
struct
aec_stream
*
strm
,
int64_t
data
)
{
*
strm
->
next_out
++
=
data
>>
24
;
*
strm
->
next_out
++
=
data
>>
16
;
...
...
@@ -85,7 +83,7 @@ static void put_msb_32(aec_streamp strm, int64_t data)
strm
->
total_out
+=
4
;
}
static
void
put_msb_24
(
aec_stream
p
strm
,
int64_t
data
)
static
void
put_msb_24
(
struct
aec_stream
*
strm
,
int64_t
data
)
{
*
strm
->
next_out
++
=
data
>>
16
;
*
strm
->
next_out
++
=
data
>>
8
;
...
...
@@ -94,7 +92,7 @@ static void put_msb_24(aec_streamp strm, int64_t data)
strm
->
total_out
+=
3
;
}
static
void
put_msb_16
(
aec_stream
p
strm
,
int64_t
data
)
static
void
put_msb_16
(
struct
aec_stream
*
strm
,
int64_t
data
)
{
*
strm
->
next_out
++
=
data
>>
8
;
*
strm
->
next_out
++
=
data
;
...
...
@@ -102,7 +100,7 @@ static void put_msb_16(aec_streamp strm, int64_t data)
strm
->
total_out
+=
2
;
}
static
void
put_lsb_32
(
aec_stream
p
strm
,
int64_t
data
)
static
void
put_lsb_32
(
struct
aec_stream
*
strm
,
int64_t
data
)
{
*
strm
->
next_out
++
=
data
;
*
strm
->
next_out
++
=
data
>>
8
;
...
...
@@ -112,7 +110,7 @@ static void put_lsb_32(aec_streamp strm, int64_t data)
strm
->
total_out
+=
4
;
}
static
void
put_lsb_24
(
aec_stream
p
strm
,
int64_t
data
)
static
void
put_lsb_24
(
struct
aec_stream
*
strm
,
int64_t
data
)
{
*
strm
->
next_out
++
=
data
;
*
strm
->
next_out
++
=
data
>>
8
;
...
...
@@ -121,7 +119,7 @@ static void put_lsb_24(aec_streamp strm, int64_t data)
strm
->
total_out
+=
3
;
}
static
void
put_lsb_16
(
aec_stream
p
strm
,
int64_t
data
)
static
void
put_lsb_16
(
struct
aec_stream
*
strm
,
int64_t
data
)
{
*
strm
->
next_out
++
=
data
;
*
strm
->
next_out
++
=
data
>>
8
;
...
...
@@ -129,27 +127,25 @@ static void put_lsb_16(aec_streamp strm, int64_t data)
strm
->
total_out
+=
2
;
}
static
void
put_8
(
aec_stream
p
strm
,
int64_t
data
)
static
void
put_8
(
struct
aec_stream
*
strm
,
int64_t
data
)
{
*
strm
->
next_out
++
=
data
;
strm
->
avail_out
--
;
strm
->
total_out
++
;
}
static
inline
void
u_put
(
aec_stream
p
strm
,
int64_t
sample
)
static
inline
void
u_put
(
struct
aec_stream
*
strm
,
int64_t
sample
)
{
int64_t
x
,
d
,
th
,
D
,
lower
;
decode_state
*
state
=
strm
->
state
;
if
(
state
->
pp
&&
(
state
->
samples_out
%
state
->
ref_int
!=
0
))
{
if
(
state
->
pp
&&
(
state
->
samples_out
%
state
->
ref_int
!=
0
))
{
d
=
sample
;
x
=
state
->
last_out
;
lower
=
x
-
state
->
xmin
;
th
=
MIN
(
lower
,
state
->
xmax
-
x
);
if
(
d
<=
2
*
th
)
{
if
(
d
<=
2
*
th
)
{
if
(
d
&
1
)
D
=
-
(
d
+
1
)
/
2
;
else
...
...
@@ -161,11 +157,8 @@ static inline void u_put(aec_streamp strm, int64_t sample)
D
=
th
-
d
;
}
sample
=
x
+
D
;
}
else
{
if
(
strm
->
flags
&
AEC_DATA_SIGNED
)
{
}
else
{
if
(
strm
->
flags
&
AEC_DATA_SIGNED
)
{
int
m
=
64
-
strm
->
bit_per_sample
;
/* Reference samples have to be sign extended */
sample
=
(
sample
<<
m
)
>>
m
;
...
...
@@ -176,7 +169,7 @@ static inline void u_put(aec_streamp strm, int64_t sample)
state
->
samples_out
++
;
}
static
inline
int64_t
u_get
(
aec_stream
p
strm
,
unsigned
int
n
)
static
inline
int64_t
u_get
(
struct
aec_stream
*
strm
,
unsigned
int
n
)
{
/**
Unsafe get n bit from input stream
...
...
@@ -187,8 +180,7 @@ static inline int64_t u_get(aec_streamp strm, unsigned int n)
decode_state
*
state
;
state
=
strm
->
state
;
while
(
state
->
bitp
<
n
)
{
while
(
state
->
bitp
<
n
)
{
strm
->
avail_in
--
;
strm
->
total_in
++
;
state
->
acc
=
(
state
->
acc
<<
8
)
|
*
strm
->
next_in
++
;
...
...
@@ -198,7 +190,7 @@ static inline int64_t u_get(aec_streamp strm, unsigned int n)
return
(
state
->
acc
>>
state
->
bitp
)
&
((
1ULL
<<
n
)
-
1
);
}
static
inline
int64_t
u_get_fs
(
aec_stream
p
strm
)
static
inline
int64_t
u_get_fs
(
struct
aec_stream
*
strm
)
{
/**
Interpret a Fundamental Sequence from the input buffer.
...
...
@@ -215,7 +207,7 @@ static inline int64_t u_get_fs(aec_streamp strm)
return
fs
;
}
static
inline
void
fast_split
(
aec_stream
p
strm
)
static
inline
void
fast_split
(
struct
aec_stream
*
strm
)
{
int
i
,
k
;
decode_state
*
state
;
...
...
@@ -229,14 +221,13 @@ static inline void fast_split(aec_streamp strm)
for
(
i
=
state
->
ref
;
i
<
strm
->
block_size
;
i
++
)
state
->
block
[
i
]
=
u_get_fs
(
strm
)
<<
k
;
for
(
i
=
state
->
ref
;
i
<
strm
->
block_size
;
i
++
)
{
for
(
i
=
state
->
ref
;
i
<
strm
->
block_size
;
i
++
)
{
state
->
block
[
i
]
+=
u_get
(
strm
,
k
);
u_put
(
strm
,
state
->
block
[
i
]);
}
}
static
inline
void
fast_zero
(
aec_stream
p
strm
)
static
inline
void
fast_zero
(
struct
aec_stream
*
strm
)
{
int
i
=
strm
->
state
->
i
;
...
...
@@ -244,22 +235,20 @@ static inline void fast_zero(aec_streamp strm)
u_put
(
strm
,
0
);
}
static
inline
void
fast_se
(
aec_stream
p
strm
)
static
inline
void
fast_se
(
struct
aec_stream
*
strm
)
{
int
i
;
int64_t
gamma
,
beta
,
ms
,
delta1
;
i
=
strm
->
state
->
ref
;
while
(
i
<
strm
->
block_size
)
{
while
(
i
<
strm
->
block_size
)
{
gamma
=
u_get_fs
(
strm
);
beta
=
second_extension
[
gamma
][
0
];
ms
=
second_extension
[
gamma
][
1
];
delta1
=
gamma
-
ms
;
if
((
i
&
1
)
==
0
)
{
if
((
i
&
1
)
==
0
)
{
u_put
(
strm
,
beta
-
delta1
);
i
++
;
}
...
...
@@ -268,7 +257,7 @@ static inline void fast_se(aec_streamp strm)
}
}
static
inline
void
fast_uncomp
(
aec_stream
p
strm
)
static
inline
void
fast_uncomp
(
struct
aec_stream
*
strm
)
{
int
i
;
...
...
@@ -276,39 +265,30 @@ static inline void fast_uncomp(aec_streamp strm)
u_put
(
strm
,
u_get
(
strm
,
strm
->
bit_per_sample
));
}
int
aec_decode_init
(
aec_stream
p
strm
)
int
aec_decode_init
(
struct
aec_stream
*
strm
)
{
int
i
,
modi
;
decode_state
*
state
;
/* Some sanity checks */
if
(
strm
->
bit_per_sample
>
32
||
strm
->
bit_per_sample
==
0
)
{
return
AEC_CONF_ERROR
;
}
/* Internal state for decoder */
state
=
(
decode_state
*
)
malloc
(
sizeof
(
decode_state
));
if
(
state
==
NULL
)
{
return
AEC_MEM_ERROR
;
}
strm
->
state
=
state
;
if
(
strm
->
bit_per_sample
>
16
)
{
if
(
strm
->
bit_per_sample
>
16
)
{
state
->
id_len
=
5
;
if
(
strm
->
bit_per_sample
<=
24
&&
strm
->
flags
&
AEC_DATA_3BYTE
)
{
if
(
strm
->
bit_per_sample
<=
24
&&
strm
->
flags
&
AEC_DATA_3BYTE
)
{
state
->
byte_per_sample
=
3
;
if
(
strm
->
flags
&
AEC_DATA_MSB
)
state
->
put_sample
=
put_msb_24
;
else
state
->
put_sample
=
put_lsb_24
;
}
else
{
}
else
{
state
->
byte_per_sample
=
4
;
if
(
strm
->
flags
&
AEC_DATA_MSB
)
state
->
put_sample
=
put_msb_32
;
...
...
@@ -318,8 +298,7 @@ int aec_decode_init(aec_streamp strm)
state
->
out_blklen
=
strm
->
block_size
*
state
->
byte_per_sample
;
}
else
if
(
strm
->
bit_per_sample
>
8
)
{
else
if
(
strm
->
bit_per_sample
>
8
)
{
state
->
byte_per_sample
=
2
;
state
->
id_len
=
4
;
state
->
out_blklen
=
strm
->
block_size
*
2
;
...
...
@@ -327,22 +306,17 @@ int aec_decode_init(aec_streamp strm)
state
->
put_sample
=
put_msb_16
;
else
state
->
put_sample
=
put_lsb_16
;
}
else
{
}
else
{
state
->
byte_per_sample
=
1
;
state
->
id_len
=
3
;
state
->
out_blklen
=
strm
->
block_size
;
state
->
put_sample
=
put_8
;
}
if
(
strm
->
flags
&
AEC_DATA_SIGNED
)
{
if
(
strm
->
flags
&
AEC_DATA_SIGNED
)
{
state
->
xmin
=
-
(
1ULL
<<
(
strm
->
bit_per_sample
-
1
));
state
->
xmax
=
(
1ULL
<<
(
strm
->
bit_per_sample
-
1
))
-
1
;
}
else
{
}
else
{
state
->
xmin
=
0
;
state
->
xmax
=
(
1ULL
<<
strm
->
bit_per_sample
)
-
1
;
}
...
...
@@ -354,21 +328,18 @@ int aec_decode_init(aec_streamp strm)
modi
=
1UL
<<
state
->
id_len
;
state
->
id_table
=
(
int
*
)
malloc
(
modi
*
sizeof
(
int
));
if
(
state
->
id_table
==
NULL
)
{
return
AEC_MEM_ERROR
;
}
state
->
id_table
[
0
]
=
M_LOW_ENTROPY
;
for
(
i
=
1
;
i
<
modi
-
1
;
i
++
)
{
for
(
i
=
1
;
i
<
modi
-
1
;
i
++
)
{
state
->
id_table
[
i
]
=
M_SPLIT
;
}
state
->
id_table
[
modi
-
1
]
=
M_UNCOMP
;
state
->
block
=
(
int64_t
*
)
malloc
(
strm
->
block_size
*
sizeof
(
int64_t
));
if
(
state
->
block
==
NULL
)
{
return
AEC_MEM_ERROR
;
}
strm
->
total_in
=
0
;
strm
->
total_out
=
0
;
...
...
@@ -380,7 +351,7 @@ int aec_decode_init(aec_streamp strm)
return
AEC_OK
;
}
int
aec_decode_end
(
aec_stream
p
strm
)
int
aec_decode_end
(
struct
aec_stream
*
strm
)
{
decode_state
*
state
;
...
...
@@ -393,9 +364,9 @@ int aec_decode_end(aec_streamp strm)
#define ASK(n) \
do { \
while (state->bitp < (unsigned)(n))
\
{
\
if (strm->avail_in == 0) goto req_buffer;
\
while (state->bitp < (unsigned)(n))
{
\
if (strm->avail_in == 0)
\
goto req_buffer;
\
strm->avail_in--; \
strm->total_in++; \
state->acc <<= 8; \
...
...
@@ -409,23 +380,22 @@ int aec_decode_end(aec_streamp strm)
#define DROP(n) state->bitp -= (unsigned)(n)
#define ASKFS() \
do { \
ASK(1); \
while ((state->acc & (1ULL << (state->bitp - 1))) == 0) \
{ \
if (state->bitp == 1) \
{ \
if (strm->avail_in == 0) goto req_buffer; \
strm->avail_in--; \
strm->total_in++; \
state->acc <<= 8; \
state->acc |= *strm->next_in++; \
state->bitp += 8; \
} \
state->fs++; \
state->bitp--; \
} \
#define ASKFS() \
do { \
ASK(1); \
while ((state->acc & (1ULL << (state->bitp - 1))) == 0) { \
if (state->bitp == 1) { \
if (strm->avail_in == 0) \
goto req_buffer; \
strm->avail_in--; \
strm->total_in++; \
state->acc <<= 8; \
state->acc |= *strm->next_in++; \
state->bitp += 8; \
} \
state->fs++; \
state->bitp--; \
} \
} while (0)
#define GETFS() state->fs
...
...
@@ -440,7 +410,8 @@ int aec_decode_end(aec_streamp strm)
#define PUT(sample) \
do { \
if (strm->avail_out == 0) goto req_buffer; \
if (strm->avail_out == 0) \
goto req_buffer; \
u_put(strm, (sample)); \
} while (0)
...
...
@@ -452,7 +423,7 @@ int aec_decode_end(aec_streamp strm)
} while (0)
int
aec_decode
(
aec_stream
p
strm
,
int
flush
)
int
aec_decode
(
struct
aec_stream
*
strm
,
int
flush
)
{
/**
Finite-state machine implementation of the adaptive entropy
...
...
@@ -470,10 +441,8 @@ int aec_decode(aec_streamp strm, int flush)
state
=
strm
->
state
;
for
(;;)
{
switch
(
state
->
mode
)
{
for
(;;)
{
switch
(
state
->
mode
)
{
case
M_ID
:
if
(
state
->
pp
&&
(
state
->
samples_out
/
strm
->
block_size
)
%
strm
->
rsi
==
0
)
...
...
@@ -488,20 +457,16 @@ int aec_decode(aec_streamp strm, int flush)
break
;
case
M_SPLIT
:
if
(
SAFE
)
{
if
(
SAFE
)
{
fast_split
(
strm
);
state
->
mode
=
M_ID
;
break
;
}
if
(
state
->
ref
)
{
if
(
state
->
ref
)
{
COPYSAMPLE
();
state
->
n
=
strm
->
block_size
-
1
;
}
else
{
}
else
{
state
->
n
=
strm
->
block_size
;
}
...
...
@@ -509,26 +474,22 @@ int aec_decode(aec_streamp strm, int flush)
state
->
mode
=
M_SPLIT_FS
;
case
M_SPLIT_FS
:
do
{
do
{
ASKFS
();
state
->
block
[
state
->
i
]
=
GETFS
();
DROPFS
();
}
while
(
state
->
i
--
);
}
while
(
state
->
i
--
);
state
->
i
=
state
->
n
-
1
;
state
->
mode
=
M_SPLIT_OUTPUT
;
case
M_SPLIT_OUTPUT
:
k
=
state
->
id
-
1
;
do
{
do
{
ASK
(
k
);
PUT
((
state
->
block
[
state
->
i
]
<<
k
)
+
GET
(
k
));
DROP
(
k
);
}
while
(
state
->
i
--
);
}
while
(
state
->
i
--
);
state
->
mode
=
M_ID
;
break
;
...
...
@@ -543,8 +504,7 @@ int aec_decode(aec_streamp strm, int flush)
if
(
state
->
ref
)
COPYSAMPLE
();
if
(
state
->
id
==
1
)
{
if
(
state
->
id
==
1
)
{
state
->
mode
=
M_SE
;
break
;
}
...
...
@@ -556,14 +516,11 @@ int aec_decode(aec_streamp strm, int flush)
zero_blocks
=
GETFS
()
+
1
;
DROPFS
();
if
(
zero_blocks
==
ROS
)
{
if
(
zero_blocks
==
ROS
)
{
zero_blocks
=
64
-
(
(
state
->
samples_out
/
strm
->
block_size
)
%
strm
->
rsi
%
64
);
}
else
if
(
zero_blocks
>
ROS
)
{
}
else
if
(
zero_blocks
>
ROS
)
{
zero_blocks
--
;
}
...
...
@@ -572,8 +529,7 @@ int aec_decode(aec_streamp strm, int flush)
else
state
->
i
=
zero_blocks
*
strm
->
block_size
;
if
(
strm
->
avail_out
>=
state
->
i
*
state
->
byte_per_sample
)
{
if
(
strm
->
avail_out
>=
state
->
i
*
state
->
byte_per_sample
)
{
fast_zero
(
strm
);
state
->
mode
=
M_ID
;
break
;
...
...
@@ -590,8 +546,7 @@ int aec_decode(aec_streamp strm, int flush)
break
;
case
M_SE
:
if
(
SAFE
)
{
if
(
SAFE
)
{
fast_se
(
strm
);
state
->
mode
=
M_ID
;
break
;
...
...
@@ -601,16 +556,14 @@ int aec_decode(aec_streamp strm, int flush)
state
->
i
=
state
->
ref
;
case
M_SE_DECODE
:
while
(
state
->
i
<
strm
->
block_size
)
{
while
(
state
->
i
<
strm
->
block_size
)
{
ASKFS
();
gamma
=
GETFS
();
beta
=
second_extension
[
gamma
][
0
];
ms
=
second_extension
[
gamma
][
1
];
delta1
=
gamma
-
ms
;
if
((
state
->
i
&
1
)
==
0
)
{
if
((
state
->
i
&
1
)
==
0
)
{
PUT
(
beta
-
delta1
);
state
->
i
++
;
}
...
...
@@ -624,8 +577,7 @@ int aec_decode(aec_streamp strm, int flush)
break
;
case
M_UNCOMP
:
if
(
SAFE
)
{
if
(
SAFE
)
{
fast_uncomp
(
strm
);
state
->
mode
=
M_ID
;
break
;
...
...
src/encode.c
View file @
fef349b5
This diff is collapsed.
Click to expand it.
src/encode.h
View file @
fef349b5
...
...
@@ -7,11 +7,11 @@
#define M_CONTINUE 1
#define M_EXIT 0
typedef
struct
internal_state
{
int
(
*
mode
)(
aec_stream
p
);
void
(
*
get_block
)(
aec_stream
p
);
uint32_t
(
*
get_sample
)(
aec_stream
p
);
void
(
*
preprocess
)(
aec_stream
p
);
struct
internal_state
{
int
(
*
mode
)(
struct
aec_stream
*
);
void
(
*
get_block
)(
struct
aec_stream
*
);
uint32_t
(
*
get_sample
)(
struct
aec_stream
*
);
void
(
*
preprocess
)(
struct
aec_stream
*
);
int
id_len
;
/* bit length of code option identification key */
int64_t
xmin
;
/* minimum integer for preprocessing */
...
...
@@ -35,6 +35,6 @@ typedef struct internal_state {
int
zero_blocks
;
/* number of contiguous zero blocks */
int
k
;
/* splitting position */
int
flush
;
/* flush option copied from argument */
}
encode_state
;
};
#endif
/* ENCODE_H */
src/encode_accessors.c
View file @
fef349b5
...
...
@@ -5,14 +5,14 @@
#include "encode.h"
#include "encode_accessors.h"
uint32_t
get_8
(
aec_stream
p
strm
)
uint32_t
get_8
(
struct
aec_stream
*
strm
)
{
strm
->
avail_in
--
;
strm
->
total_in
++
;
return
*
strm
->
next_in
++
;
}
uint32_t
get_lsb_24
(
aec_stream
p
strm
)
uint32_t
get_lsb_24
(
struct
aec_stream
*
strm
)
{
uint32_t
data
;
...
...
@@ -26,7 +26,7 @@ uint32_t get_lsb_24(aec_streamp strm)
return
data
;
}
uint32_t
get_msb_24
(
aec_stream
p
strm
)
uint32_t
get_msb_24
(
struct
aec_stream
*
strm
)
{
uint32_t
data
;
...
...
@@ -42,7 +42,7 @@ uint32_t get_msb_24(aec_streamp strm)
#ifdef WORDS_BIGENDIAN
uint32_t
get_lsb_16
(
aec_stream
p
strm
)
uint32_t
get_lsb_16
(
struct
aec_stream
*
strm
)
{
uint32_t
data
;
...
...
@@ -55,7 +55,7 @@ uint32_t get_lsb_16(aec_streamp strm)
return
data
;
}
uint32_t
get_msb_16
(
aec_stream
p
strm
)
uint32_t
get_msb_16
(
struct
aec_stream
*
strm
)
{
uint32_t
data
;
...
...
@@ -66,7 +66,7 @@ uint32_t get_msb_16(aec_streamp strm)
return
data
;
}
uint32_t
get_lsb_32
(
aec_stream
p
strm
)
uint32_t
get_lsb_32
(
struct
aec_stream
*
strm
)
{
uint32_t
data
;
...
...
@@ -81,7 +81,7 @@ uint32_t get_lsb_32(aec_streamp strm)
return
data
;
}
uint32_t
get_msb_32
(
aec_stream
p
strm
)
uint32_t
get_msb_32
(
struct
aec_stream
*
strm
)
{
uint32_t
data
;
...
...
@@ -93,7 +93,7 @@ uint32_t get_msb_32(aec_streamp strm)
}
#else
/* not WORDS_BIGENDIAN */
uint32_t
get_lsb_16
(
aec_stream
p
strm
)
uint32_t
get_lsb_16
(
struct
aec_stream
*
strm
)
{
uint32_t
data
;
...
...
@@ -104,7 +104,7 @@ uint32_t get_lsb_16(aec_streamp strm)
return
data
;
}
uint32_t
get_msb_16
(
aec_stream
p
strm
)
uint32_t
get_msb_16
(
struct
aec_stream
*
strm
)
{