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Kirill Smelkov
cpython
Commits
4dfc2032
Commit
4dfc2032
authored
Aug 24, 1992
by
Jack Jansen
Browse files
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Plain Diff
Added rms, maxpp and avgpp methods.
parent
79f99121
Changes
1
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1 changed file
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-0
Modules/audioop.c
Modules/audioop.c
+146
-0
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Modules/audioop.c
View file @
4dfc2032
...
...
@@ -28,6 +28,8 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#define signed
#endif
#include <math.h>
#include "allobjects.h"
#include "modsupport.h"
...
...
@@ -239,6 +241,147 @@ audioop_avg(self, args)
return
newintobject
(
val
);
}
static
object
*
audioop_rms
(
self
,
args
)
object
*
self
;
object
*
args
;
{
signed
char
*
cp
;
int
len
,
size
,
val
;
int
i
;
float
sum_squares
=
0
.
0
;
if
(
!
getargs
(
args
,
"(s#i)"
,
&
cp
,
&
len
,
&
size
)
)
return
0
;
if
(
size
!=
1
&&
size
!=
2
&&
size
!=
4
)
{
err_setstr
(
AudioopError
,
"Size should be 1, 2 or 4"
);
return
0
;
}
for
(
i
=
0
;
i
<
len
;
i
+=
size
)
{
if
(
size
==
1
)
val
=
(
int
)
*
CHARP
(
cp
,
i
);
else
if
(
size
==
2
)
val
=
(
int
)
*
SHORTP
(
cp
,
i
);
else
if
(
size
==
4
)
val
=
(
int
)
*
LONGP
(
cp
,
i
);
sum_squares
+=
(
float
)
val
*
(
float
)
val
;
}
if
(
len
==
0
)
val
=
0
;
else
val
=
(
int
)
sqrt
(
sum_squares
/
(
float
)(
len
/
size
));
return
newintobject
(
val
);
}
static
object
*
audioop_avgpp
(
self
,
args
)
object
*
self
;
object
*
args
;
{
signed
char
*
cp
;
int
len
,
size
,
val
,
prevval
,
prevextremevalid
=
0
,
prevextreme
;
int
i
;
float
avg
=
0
.
0
;
int
diff
,
prevdiff
,
extremediff
,
nextreme
=
0
;
if
(
!
getargs
(
args
,
"(s#i)"
,
&
cp
,
&
len
,
&
size
)
)
return
0
;
if
(
size
!=
1
&&
size
!=
2
&&
size
!=
4
)
{
err_setstr
(
AudioopError
,
"Size should be 1, 2 or 4"
);
return
0
;
}
/* Compute first delta value ahead. Also automatically makes us
** skip the first extreme value
*/
if
(
size
==
1
)
prevval
=
(
int
)
*
CHARP
(
cp
,
0
);
else
if
(
size
==
2
)
prevval
=
(
int
)
*
SHORTP
(
cp
,
0
);
else
if
(
size
==
4
)
prevval
=
(
int
)
*
LONGP
(
cp
,
0
);
if
(
size
==
1
)
val
=
(
int
)
*
CHARP
(
cp
,
size
);
else
if
(
size
==
2
)
val
=
(
int
)
*
SHORTP
(
cp
,
size
);
else
if
(
size
==
4
)
val
=
(
int
)
*
LONGP
(
cp
,
size
);
prevdiff
=
val
-
prevval
;
for
(
i
=
size
;
i
<
len
;
i
+=
size
)
{
if
(
size
==
1
)
val
=
(
int
)
*
CHARP
(
cp
,
i
);
else
if
(
size
==
2
)
val
=
(
int
)
*
SHORTP
(
cp
,
i
);
else
if
(
size
==
4
)
val
=
(
int
)
*
LONGP
(
cp
,
i
);
diff
=
val
-
prevval
;
if
(
diff
*
prevdiff
<
0
)
{
/* Derivative changed sign. Compute difference to last extreme
** value and remember.
*/
if
(
prevextremevalid
)
{
extremediff
=
prevval
-
prevextreme
;
if
(
extremediff
<
0
)
extremediff
=
-
extremediff
;
avg
+=
extremediff
;
nextreme
++
;
}
prevextremevalid
=
1
;
prevextreme
=
prevval
;
}
prevval
=
val
;
if
(
diff
!=
0
)
prevdiff
=
diff
;
}
if
(
nextreme
==
0
)
val
=
0
;
else
val
=
(
int
)(
avg
/
(
float
)
nextreme
);
return
newintobject
(
val
);
}
static
object
*
audioop_maxpp
(
self
,
args
)
object
*
self
;
object
*
args
;
{
signed
char
*
cp
;
int
len
,
size
,
val
,
prevval
,
prevextremevalid
=
0
,
prevextreme
;
int
i
;
int
max
=
0
;
int
diff
,
prevdiff
,
extremediff
;
if
(
!
getargs
(
args
,
"(s#i)"
,
&
cp
,
&
len
,
&
size
)
)
return
0
;
if
(
size
!=
1
&&
size
!=
2
&&
size
!=
4
)
{
err_setstr
(
AudioopError
,
"Size should be 1, 2 or 4"
);
return
0
;
}
/* Compute first delta value ahead. Also automatically makes us
** skip the first extreme value
*/
if
(
size
==
1
)
prevval
=
(
int
)
*
CHARP
(
cp
,
0
);
else
if
(
size
==
2
)
prevval
=
(
int
)
*
SHORTP
(
cp
,
0
);
else
if
(
size
==
4
)
prevval
=
(
int
)
*
LONGP
(
cp
,
0
);
if
(
size
==
1
)
val
=
(
int
)
*
CHARP
(
cp
,
size
);
else
if
(
size
==
2
)
val
=
(
int
)
*
SHORTP
(
cp
,
size
);
else
if
(
size
==
4
)
val
=
(
int
)
*
LONGP
(
cp
,
size
);
prevdiff
=
val
-
prevval
;
for
(
i
=
size
;
i
<
len
;
i
+=
size
)
{
if
(
size
==
1
)
val
=
(
int
)
*
CHARP
(
cp
,
i
);
else
if
(
size
==
2
)
val
=
(
int
)
*
SHORTP
(
cp
,
i
);
else
if
(
size
==
4
)
val
=
(
int
)
*
LONGP
(
cp
,
i
);
diff
=
val
-
prevval
;
if
(
diff
*
prevdiff
<
0
)
{
/* Derivative changed sign. Compute difference to last extreme
** value and remember.
*/
if
(
prevextremevalid
)
{
extremediff
=
prevval
-
prevextreme
;
if
(
extremediff
<
0
)
extremediff
=
-
extremediff
;
if
(
extremediff
>
max
)
max
=
extremediff
;
}
prevextremevalid
=
1
;
prevextreme
=
prevval
;
}
prevval
=
val
;
if
(
diff
!=
0
)
prevdiff
=
diff
;
}
return
newintobject
(
max
);
}
static
object
*
audioop_cross
(
self
,
args
)
object
*
self
;
...
...
@@ -869,6 +1012,9 @@ audioop_adpcm2lin(self, args)
static
struct
methodlist
audioop_methods
[]
=
{
{
"max"
,
audioop_max
},
{
"avg"
,
audioop_avg
},
{
"maxpp"
,
audioop_maxpp
},
{
"avgpp"
,
audioop_avgpp
},
{
"rms"
,
audioop_rms
},
{
"cross"
,
audioop_cross
},
{
"mul"
,
audioop_mul
},
{
"add"
,
audioop_add
},
...
...
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