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Issue #12866: The audioop module now supports 24-bit samples.

This commit is contained in:
Serhiy Storchaka 2013-10-19 21:10:46 +03:00
parent c679227e31
commit eaea5e9107
5 changed files with 252 additions and 258 deletions
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19
Doc/library/audioop.rst
View File

@ -6,9 +6,12 @@
The :mod:`audioop` module contains some useful operations on sound fragments.
It operates on sound fragments consisting of signed integer samples 8, 16 or 32
bits wide, stored in bytes objects. All scalar items are integers, unless
specified otherwise.
It operates on sound fragments consisting of signed integer samples 8, 16, 24
or 32 bits wide, stored in bytes objects. All scalar items are integers,
unless specified otherwise.
.. versionchanged:: 3.4
Support for 24-bit samples was added.
.. index::
single: Intel/DVI ADPCM
@ -35,7 +38,7 @@ The module defines the following variables and functions:
.. function:: add(fragment1, fragment2, width)
Return a fragment which is the addition of the two samples passed as parameters.
*width* is the sample width in bytes, either ``1``, ``2`` or ``4``. Both
*width* is the sample width in bytes, either ``1``, ``2``, ``3`` or ``4``. Both
fragments should have the same length. Samples are truncated in case of overflow.
@ -133,19 +136,19 @@ The module defines the following variables and functions:
.. function:: lin2lin(fragment, width, newwidth)
Convert samples between 1-, 2- and 4-byte formats.
Convert samples between 1-, 2-, 3- and 4-byte formats.
.. note::
In some audio formats, such as .WAV files, 16 and 32 bit samples are
In some audio formats, such as .WAV files, 16, 24 and 32 bit samples are
signed, but 8 bit samples are unsigned. So when converting to 8 bit wide
samples for these formats, you need to also add 128 to the result::
new_frames = audioop.lin2lin(frames, old_width, 1)
new_frames = audioop.bias(new_frames, 1, 128)
The same, in reverse, has to be applied when converting from 8 to 16 or 32
bit width samples.
The same, in reverse, has to be applied when converting from 8 to 16, 24
or 32 bit width samples.
.. function:: lin2ulaw(fragment, width)

6
Doc/whatsnew/3.4.rst
View File

@ -197,6 +197,12 @@ The :meth:`~aifc.getparams` method now returns a namedtuple rather than a
plain tuple. (Contributed by Claudiu Popa in :issue:`17818`.)
audioop
-------
Added support for 24-bit samples (:issue:`12866`).
codecs
------

60
Lib/test/test_audioop.py
View File

@ -6,13 +6,18 @@ from test.support import run_unittest
def pack(width, data):
return b''.join(v.to_bytes(width, sys.byteorder, signed=True) for v in data)
packs = {w: (lambda *data, width=w: pack(width, data)) for w in (1, 2, 4)}
maxvalues = {w: (1 << (8 * w - 1)) - 1 for w in (1, 2, 4)}
minvalues = {w: -1 << (8 * w - 1) for w in (1, 2, 4)}
def unpack(width, data):
return [int.from_bytes(data[i: i + width], sys.byteorder, signed=True)
for i in range(0, len(data), width)]
packs = {w: (lambda *data, width=w: pack(width, data)) for w in (1, 2, 3, 4)}
maxvalues = {w: (1 << (8 * w - 1)) - 1 for w in (1, 2, 3, 4)}
minvalues = {w: -1 << (8 * w - 1) for w in (1, 2, 3, 4)}
datas = {
1: b'\x00\x12\x45\xbb\x7f\x80\xff',
2: packs[2](0, 0x1234, 0x4567, -0x4567, 0x7fff, -0x8000, -1),
3: packs[3](0, 0x123456, 0x456789, -0x456789, 0x7fffff, -0x800000, -1),
4: packs[4](0, 0x12345678, 0x456789ab, -0x456789ab,
0x7fffffff, -0x80000000, -1),
}
@ -20,6 +25,7 @@ datas = {
INVALID_DATA = [
(b'abc', 0),
(b'abc', 2),
(b'ab', 3),
(b'abc', 4),
]
@ -27,7 +33,7 @@ INVALID_DATA = [
class TestAudioop(unittest.TestCase):
def test_max(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.max(b'', w), 0)
p = packs[w]
self.assertEqual(audioop.max(p(5), w), 5)
@ -37,7 +43,7 @@ class TestAudioop(unittest.TestCase):
self.assertEqual(audioop.max(datas[w], w), -minvalues[w])
def test_minmax(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.minmax(b'', w),
(0x7fffffff, -0x80000000))
p = packs[w]
@ -51,7 +57,7 @@ class TestAudioop(unittest.TestCase):
(minvalues[w], maxvalues[w]))
def test_maxpp(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.maxpp(b'', w), 0)
self.assertEqual(audioop.maxpp(packs[w](*range(100)), w), 0)
self.assertEqual(audioop.maxpp(packs[w](9, 10, 5, 5, 0, 1), w), 10)
@ -59,7 +65,7 @@ class TestAudioop(unittest.TestCase):
maxvalues[w] - minvalues[w])
def test_avg(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.avg(b'', w), 0)
p = packs[w]
self.assertEqual(audioop.avg(p(5), w), 5)
@ -75,7 +81,7 @@ class TestAudioop(unittest.TestCase):
-0x60000000)
def test_avgpp(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.avgpp(b'', w), 0)
self.assertEqual(audioop.avgpp(packs[w](*range(100)), w), 0)
self.assertEqual(audioop.avgpp(packs[w](9, 10, 5, 5, 0, 1), w), 10)
@ -84,7 +90,7 @@ class TestAudioop(unittest.TestCase):
self.assertEqual(audioop.avgpp(datas[4], 4), 3311897002)
def test_rms(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.rms(b'', w), 0)
p = packs[w]
self.assertEqual(audioop.rms(p(*range(100)), w), 57)
@ -97,7 +103,7 @@ class TestAudioop(unittest.TestCase):
self.assertEqual(audioop.rms(datas[4], 4), 1310854152)
def test_cross(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.cross(b'', w), -1)
p = packs[w]
self.assertEqual(audioop.cross(p(0, 1, 2), w), 0)
@ -107,7 +113,7 @@ class TestAudioop(unittest.TestCase):
self.assertEqual(audioop.cross(p(minvalues[w], maxvalues[w]), w), 1)
def test_add(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.add(b'', b'', w), b'')
self.assertEqual(audioop.add(datas[w], b'\0' * len(datas[w]), w),
datas[w])
@ -120,7 +126,7 @@ class TestAudioop(unittest.TestCase):
0x7fffffff, -0x80000000, -2))
def test_bias(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
for bias in 0, 1, -1, 127, -128, 0x7fffffff, -0x80000000:
self.assertEqual(audioop.bias(b'', w, bias), b'')
self.assertEqual(audioop.bias(datas[1], 1, 1),
@ -153,7 +159,7 @@ class TestAudioop(unittest.TestCase):
-1, 0, 0x7fffffff))
def test_lin2lin(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.lin2lin(datas[w], w, w), datas[w])
self.assertEqual(audioop.lin2lin(datas[1], 1, 2),
@ -181,7 +187,7 @@ class TestAudioop(unittest.TestCase):
-0xb30000), (-179, 40)))
# Very cursory test
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.adpcm2lin(b'\0' * 5, w, None),
(b'\0' * w * 10, (0, 0)))
@ -194,7 +200,7 @@ class TestAudioop(unittest.TestCase):
(b'\x07\x7f\x7f', (31, 39)))
# Very cursory test
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.lin2adpcm(b'\0' * w * 10, w, None),
(b'\0' * 5, (0, 0)))
@ -211,12 +217,12 @@ class TestAudioop(unittest.TestCase):
b'\x80\x83\xa4\xaa\xd1\xd4\xd5\xd8\xeb\xf1\xff'
src = [-688, -720, -2240, -4032, -9, -3, -1, -27, -244, -82, -106,
688, 720, 2240, 4032, 9, 3, 1, 27, 244, 82, 106]
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.alaw2lin(encoded, w),
packs[w](*(x << (w * 8) >> 13 for x in src)))
encoded = bytes(range(256))
for w in 2, 4:
for w in 2, 3, 4:
decoded = audioop.alaw2lin(encoded, w)
self.assertEqual(audioop.lin2alaw(decoded, w), encoded)
@ -233,18 +239,18 @@ class TestAudioop(unittest.TestCase):
b'\x80\x8e\xa8\xbf\xd7\xea\xf6\xfc\xfe\xff'
src = [-8031, -4447, -1471, -495, -163, -53, -18, -6, -2, 0,
8031, 4447, 1471, 495, 163, 53, 18, 6, 2, 0]
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.ulaw2lin(encoded, w),
packs[w](*(x << (w * 8) >> 14 for x in src)))
# Current u-law implementation has two codes fo 0: 0x7f and 0xff.
encoded = bytes(range(127)) + bytes(range(128, 256))
for w in 2, 4:
for w in 2, 3, 4:
decoded = audioop.ulaw2lin(encoded, w)
self.assertEqual(audioop.lin2ulaw(decoded, w), encoded)
def test_mul(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.mul(b'', w, 2), b'')
self.assertEqual(audioop.mul(datas[w], w, 0),
b'\0' * len(datas[w]))
@ -259,7 +265,7 @@ class TestAudioop(unittest.TestCase):
0x7fffffff, -0x80000000, -2))
def test_ratecv(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.ratecv(b'', w, 1, 8000, 8000, None),
(b'', (-1, ((0, 0),))))
self.assertEqual(audioop.ratecv(b'', w, 5, 8000, 8000, None),
@ -273,7 +279,7 @@ class TestAudioop(unittest.TestCase):
d2, state = audioop.ratecv(b'\x00\x01\x02', 1, 1, 8000, 16000, state)
self.assertEqual(d1 + d2, b'\000\000\001\001\002\001\000\000\001\001\002')
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
d0, state0 = audioop.ratecv(datas[w], w, 1, 8000, 16000, None)
d, state = b'', None
for i in range(0, len(datas[w]), w):
@ -284,13 +290,13 @@ class TestAudioop(unittest.TestCase):
self.assertEqual(state, state0)
def test_reverse(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
self.assertEqual(audioop.reverse(b'', w), b'')
self.assertEqual(audioop.reverse(packs[w](0, 1, 2), w),
packs[w](2, 1, 0))
def test_tomono(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
data1 = datas[w]
data2 = bytearray(2 * len(data1))
for k in range(w):
@ -302,7 +308,7 @@ class TestAudioop(unittest.TestCase):
self.assertEqual(audioop.tomono(data2, w, 0.5, 0.5), data1)
def test_tostereo(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
data1 = datas[w]
data2 = bytearray(2 * len(data1))
for k in range(w):
@ -329,7 +335,7 @@ class TestAudioop(unittest.TestCase):
self.assertEqual(audioop.findmax(datas[2], 1), 5)
def test_getsample(self):
for w in 1, 2, 4:
for w in 1, 2, 3, 4:
data = packs[w](0, 1, -1, maxvalues[w], minvalues[w])
self.assertEqual(audioop.getsample(data, w, 0), 0)
self.assertEqual(audioop.getsample(data, w, 1), 1)
@ -369,7 +375,7 @@ class TestAudioop(unittest.TestCase):
def test_wrongsize(self):
data = b'abcdefgh'
state = None
for size in (-1, 0, 3, 5, 1024):
for size in (-1, 0, 5, 1024):
self.assertRaises(audioop.error, audioop.ulaw2lin, data, size)
self.assertRaises(audioop.error, audioop.alaw2lin, data, size)
self.assertRaises(audioop.error, audioop.adpcm2lin, data, size, state)

2
Misc/NEWS
View File

@ -59,6 +59,8 @@ Core and Builtins
Library
-------
- Issue #12866: The audioop module now supports 24-bit samples.
- Issue #19254: Provide an optimized Python implementation of pbkdf2_hmac.
- Issues #19201, #19222, #19223: Add "x" mode (exclusive creation) in opening

387
Modules/audioop.c
View File

@ -5,18 +5,6 @@
#include "Python.h"
#if SIZEOF_INT == 4
typedef int Py_Int32;
typedef unsigned int Py_UInt32;
#else
#if SIZEOF_LONG == 4
typedef long Py_Int32;
typedef unsigned long Py_UInt32;
#else
#error "No 4-byte integral type"
#endif
#endif
typedef short PyInt16;
#if defined(__CHAR_UNSIGNED__)
@ -160,9 +148,6 @@ st_14linear2ulaw(PyInt16 pcm_val) /* 2's complement (14-bit range) */
PyInt16 seg;
unsigned char uval;
/* The original sox code does this in the calling function, not here */
pcm_val = pcm_val >> 2;
/* u-law inverts all bits */
/* Get the sign and the magnitude of the value. */
if (pcm_val < 0) {
@ -257,9 +242,6 @@ st_linear2alaw(PyInt16 pcm_val) /* 2's complement (13-bit range) */
short seg;
unsigned char aval;
/* The original sox code does this in the calling function, not here */
pcm_val = pcm_val >> 3;
/* A-law using even bit inversion */
if (pcm_val >= 0) {
mask = 0xD5; /* sign (7th) bit = 1 */
@ -304,19 +286,91 @@ static int stepsizeTable[89] = {
15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
};
#define CHARP(cp, i) ((signed char *)(cp+i))
#define SHORTP(cp, i) ((short *)(cp+i))
#define LONGP(cp, i) ((Py_Int32 *)(cp+i))
#define GETINTX(T, cp, i) (*(T *)((cp) + (i)))
#define SETINTX(T, cp, i, val) do { \
*(T *)((cp) + (i)) = (T)(val); \
} while (0)
#define GETINT8(cp, i) GETINTX(signed char, (cp), (i))
#define GETINT16(cp, i) GETINTX(short, (cp), (i))
#define GETINT32(cp, i) GETINTX(PY_INT32_T, (cp), (i))
#if WORDS_BIGENDIAN
#define GETINT24(cp, i) ( \
((unsigned char *)(cp) + (i))[2] + \
(((unsigned char *)(cp) + (i))[1] << 8) + \
(((signed char *)(cp) + (i))[0] << 16) )
#else
#define GETINT24(cp, i) ( \
((unsigned char *)(cp) + (i))[0] + \
(((unsigned char *)(cp) + (i))[1] << 8) + \
(((signed char *)(cp) + (i))[2] << 16) )
#endif
#define SETINT8(cp, i, val) SETINTX(signed char, (cp), (i), (val))
#define SETINT16(cp, i, val) SETINTX(short, (cp), (i), (val))
#define SETINT32(cp, i, val) SETINTX(PY_INT32_T, (cp), (i), (val))
#if WORDS_BIGENDIAN
#define SETINT24(cp, i, val) do { \
((unsigned char *)(cp) + (i))[2] = (int)(val); \
((unsigned char *)(cp) + (i))[1] = (int)(val) >> 8; \
((signed char *)(cp) + (i))[0] = (int)(val) >> 16; \
} while (0)
#else
#define SETINT24(cp, i, val) do { \
((unsigned char *)(cp) + (i))[0] = (int)(val); \
((unsigned char *)(cp) + (i))[1] = (int)(val) >> 8; \
((signed char *)(cp) + (i))[2] = (int)(val) >> 16; \
} while (0)
#endif
#define GETRAWSAMPLE(size, cp, i) ( \
(size == 1) ? (int)GETINT8((cp), (i)) : \
(size == 2) ? (int)GETINT16((cp), (i)) : \
(size == 3) ? (int)GETINT24((cp), (i)) : \
(int)GETINT32((cp), (i)))
#define SETRAWSAMPLE(size, cp, i, val) do { \
if (size == 1) \
SETINT8((cp), (i), (val)); \
else if (size == 2) \
SETINT16((cp), (i), (val)); \
else if (size == 3) \
SETINT24((cp), (i), (val)); \
else \
SETINT32((cp), (i), (val)); \
} while(0)
#define GETSAMPLE32(size, cp, i) ( \
(size == 1) ? (int)GETINT8((cp), (i)) << 24 : \
(size == 2) ? (int)GETINT16((cp), (i)) << 16 : \
(size == 3) ? (int)GETINT24((cp), (i)) << 8 : \
(int)GETINT32((cp), (i)))
#define SETSAMPLE32(size, cp, i, val) do { \
if (size == 1) \
SETINT8((cp), (i), (val) >> 24); \
else if (size == 2) \
SETINT16((cp), (i), (val) >> 16); \
else if (size == 3) \
SETINT24((cp), (i), (val) >> 8); \
else \
SETINT32((cp), (i), (val)); \
} while(0)
static PyObject *AudioopError;
static int
audioop_check_size(int size)
{
if (size != 1 && size != 2 && size != 4) {
PyErr_SetString(AudioopError, "Size should be 1, 2 or 4");
if (size < 1 || size > 4) {
PyErr_SetString(AudioopError, "Size should be 1, 2, 3 or 4");
return 0;
}
else
@ -340,7 +394,7 @@ audioop_getsample(PyObject *self, PyObject *args)
{
signed char *cp;
Py_ssize_t len, i;
int size, val = 0;
int size;
if ( !PyArg_ParseTuple(args, "s#in:getsample", &cp, &len, &size, &i) )
return 0;
@ -350,10 +404,7 @@ audioop_getsample(PyObject *self, PyObject *args)
PyErr_SetString(AudioopError, "Index out of range");
return 0;
}
if ( size == 1 ) val = (int)*CHARP(cp, i);
else if ( size == 2 ) val = (int)*SHORTP(cp, i*2);
else if ( size == 4 ) val = (int)*LONGP(cp, i*4);
return PyLong_FromLong(val);
return PyLong_FromLong(GETRAWSAMPLE(size, cp, i*size));
}
static PyObject *
@ -361,7 +412,7 @@ audioop_max(PyObject *self, PyObject *args)
{
signed char *cp;
Py_ssize_t len, i;
int size, val = 0;
int size;
unsigned int absval, max = 0;
if ( !PyArg_ParseTuple(args, "s#i:max", &cp, &len, &size) )
@ -369,9 +420,7 @@ audioop_max(PyObject *self, PyObject *args)
if (!audioop_check_parameters(len, size))
return NULL;
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);
int val = GETRAWSAMPLE(size, cp, i);
if (val < 0) absval = (-val);
else absval = val;
if (absval > max) max = absval;
@ -384,7 +433,7 @@ audioop_minmax(PyObject *self, PyObject *args)
{
signed char *cp;
Py_ssize_t len, i;
int size, val = 0;
int size;
int min = 0x7fffffff, max = -0x80000000;
if (!PyArg_ParseTuple(args, "s#i:minmax", &cp, &len, &size))
@ -392,9 +441,7 @@ audioop_minmax(PyObject *self, PyObject *args)
if (!audioop_check_parameters(len, size))
return NULL;
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);
int val = GETRAWSAMPLE(size, cp, i);
if (val > max) max = val;
if (val < min) min = val;
}
@ -406,24 +453,20 @@ audioop_avg(PyObject *self, PyObject *args)
{
signed char *cp;
Py_ssize_t len, i;
int size, val = 0;
double avg = 0.0;
int size, avg;
double sum = 0.0;
if ( !PyArg_ParseTuple(args, "s#i:avg", &cp, &len, &size) )
return 0;
if (!audioop_check_parameters(len, size))
return NULL;
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);
avg += val;
}
for (i = 0; i < len; i += size)
sum += GETRAWSAMPLE(size, cp, i);
if ( len == 0 )
val = 0;
avg = 0;
else
val = (int)floor(avg / (double)(len/size));
return PyLong_FromLong(val);
avg = (int)floor(sum / (double)(len/size));
return PyLong_FromLong(avg);
}
static PyObject *
@ -431,7 +474,7 @@ audioop_rms(PyObject *self, PyObject *args)
{
signed char *cp;
Py_ssize_t len, i;
int size, val = 0;
int size;
unsigned int res;
double sum_squares = 0.0;
@ -440,10 +483,8 @@ audioop_rms(PyObject *self, PyObject *args)
if (!audioop_check_parameters(len, size))
return NULL;
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 += (double)val*(double)val;
double val = GETRAWSAMPLE(size, cp, i);
sum_squares += val*val;
}
if ( len == 0 )
res = 0;
@ -637,7 +678,7 @@ audioop_avgpp(PyObject *self, PyObject *args)
{
signed char *cp;
Py_ssize_t len, i;
int size, val = 0, prevval = 0, prevextremevalid = 0,
int size, prevval, prevextremevalid = 0,
prevextreme = 0;
double sum = 0.0;
unsigned int avg;
@ -649,14 +690,10 @@ audioop_avgpp(PyObject *self, PyObject *args)
return NULL;
if (len <= size)
return PyLong_FromLong(0);
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);
prevval = GETRAWSAMPLE(size, cp, 0);
prevdiff = 17; /* Anything != 0, 1 */
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);
int val = GETRAWSAMPLE(size, cp, i);
if (val != prevval) {
diff = val < prevval;
if (prevdiff == !diff) {
@ -664,7 +701,12 @@ audioop_avgpp(PyObject *self, PyObject *args)
** extreme value and remember.
*/
if (prevextremevalid) {
sum += fabs((double)prevval - (double)prevextreme);
if (prevval < prevextreme)
sum += (double)((unsigned int)prevextreme -
(unsigned int)prevval);
else
sum += (double)((unsigned int)prevval -
(unsigned int)prevextreme);
nextreme++;
}
prevextremevalid = 1;
@ -686,7 +728,7 @@ audioop_maxpp(PyObject *self, PyObject *args)
{
signed char *cp;
Py_ssize_t len, i;
int size, val = 0, prevval = 0, prevextremevalid = 0,
int size, prevval, prevextremevalid = 0,
prevextreme = 0;
unsigned int max = 0, extremediff;
int diff, prevdiff;
@ -697,14 +739,10 @@ audioop_maxpp(PyObject *self, PyObject *args)
return NULL;
if (len <= size)
return PyLong_FromLong(0);
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);
prevval = GETRAWSAMPLE(size, cp, 0);
prevdiff = 17; /* Anything != 0, 1 */
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);
int val = GETRAWSAMPLE(size, cp, i);
if (val != prevval) {
diff = val < prevval;
if (prevdiff == !diff) {
@ -736,7 +774,7 @@ audioop_cross(PyObject *self, PyObject *args)
{
signed char *cp;
Py_ssize_t len, i;
int size, val = 0;
int size;
int prevval;
Py_ssize_t ncross;
@ -747,10 +785,7 @@ audioop_cross(PyObject *self, PyObject *args)
ncross = -1;
prevval = 17; /* Anything <> 0,1 */
for (i = 0; i < len; i += size) {
if ( size == 1 ) val = ((int)*CHARP(cp, i)) >> 7;
else if ( size == 2 ) val = ((int)*SHORTP(cp, i)) >> 15;
else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 31;
val = val & 1;
int val = GETRAWSAMPLE(size, cp, i) < 0;
if (val != prevval) ncross++;
prevval = val;
}
@ -762,8 +797,8 @@ audioop_mul(PyObject *self, PyObject *args)
{
signed char *cp, *ncp;
Py_ssize_t len, i;
int size, val = 0;
double factor, fval, maxval, minval;
int size;
double factor, maxval, minval;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s#id:mul", &cp, &len, &size, &factor ) )
@ -779,16 +814,11 @@ audioop_mul(PyObject *self, PyObject *args)
return 0;
ncp = (signed char *)PyBytes_AsString(rv);
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);
fval = (double)val*factor;
val = (int)floor(fbound(fval, minval, maxval));
if ( size == 1 ) *CHARP(ncp, i) = (signed char)val;
else if ( size == 2 ) *SHORTP(ncp, i) = (short)val;
else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)val;
double val = GETRAWSAMPLE(size, cp, i);
val *= factor;
val = floor(fbound(val, minval, maxval));
SETRAWSAMPLE(size, ncp, i, (int)val);
}
return rv;
}
@ -799,8 +829,8 @@ audioop_tomono(PyObject *self, PyObject *args)
Py_buffer pcp;
signed char *cp, *ncp;
Py_ssize_t len, i;
int size, val1 = 0, val2 = 0;
double fac1, fac2, fval, maxval, minval;
int size;
double fac1, fac2, maxval, minval;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s*idd:tomono",
@ -828,19 +858,12 @@ audioop_tomono(PyObject *self, PyObject *args)
}
ncp = (signed char *)PyBytes_AsString(rv);
for (i = 0; i < len; i += size*2) {
if ( size == 1 ) val1 = (int)*CHARP(cp, i);
else if ( size == 2 ) val1 = (int)*SHORTP(cp, i);
else if ( size == 4 ) val1 = (int)*LONGP(cp, i);
if ( size == 1 ) val2 = (int)*CHARP(cp, i+1);
else if ( size == 2 ) val2 = (int)*SHORTP(cp, i+2);
else if ( size == 4 ) val2 = (int)*LONGP(cp, i+4);
fval = (double)val1*fac1 + (double)val2*fac2;
val1 = (int)floor(fbound(fval, minval, maxval));
if ( size == 1 ) *CHARP(ncp, i/2) = (signed char)val1;
else if ( size == 2 ) *SHORTP(ncp, i/2) = (short)val1;
else if ( size == 4 ) *LONGP(ncp, i/2)= (Py_Int32)val1;
double val1 = GETRAWSAMPLE(size, cp, i);
double val2 = GETRAWSAMPLE(size, cp, i + size);
double val = val1*fac1 + val2*fac2;
val = floor(fbound(val, minval, maxval));
SETRAWSAMPLE(size, ncp, i/2, val);
}
PyBuffer_Release(&pcp);
return rv;
@ -851,8 +874,8 @@ audioop_tostereo(PyObject *self, PyObject *args)
{
signed char *cp, *ncp;
Py_ssize_t len, i;
int size, val1, val2, val = 0;
double fac1, fac2, fval, maxval, minval;
int size;
double fac1, fac2, maxval, minval;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s#idd:tostereo",
@ -875,25 +898,12 @@ audioop_tostereo(PyObject *self, PyObject *args)
return 0;
ncp = (signed char *)PyBytes_AsString(rv);
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);
fval = (double)val*fac1;
val1 = (int)floor(fbound(fval, minval, maxval));
fval = (double)val*fac2;
val2 = (int)floor(fbound(fval, minval, maxval));
if ( size == 1 ) *CHARP(ncp, i*2) = (signed char)val1;
else if ( size == 2 ) *SHORTP(ncp, i*2) = (short)val1;
else if ( size == 4 ) *LONGP(ncp, i*2) = (Py_Int32)val1;
if ( size == 1 ) *CHARP(ncp, i*2+1) = (signed char)val2;
else if ( size == 2 ) *SHORTP(ncp, i*2+2) = (short)val2;
else if ( size == 4 ) *LONGP(ncp, i*2+4) = (Py_Int32)val2;
double val = GETRAWSAMPLE(size, cp, i);
int val1 = (int)floor(fbound(val*fac1, minval, maxval));
int val2 = (int)floor(fbound(val*fac2, minval, maxval));
SETRAWSAMPLE(size, ncp, i*2, val1);
SETRAWSAMPLE(size, ncp, i*2 + size, val2);
}
return rv;
}
@ -903,7 +913,7 @@ audioop_add(PyObject *self, PyObject *args)
{
signed char *cp1, *cp2, *ncp;
Py_ssize_t len1, len2, i;
int size, val1 = 0, val2 = 0, minval, maxval, newval;
int size, minval, maxval, newval;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s#s#i:add",
@ -925,13 +935,8 @@ audioop_add(PyObject *self, PyObject *args)
ncp = (signed char *)PyBytes_AsString(rv);
for (i = 0; i < len1; i += size) {
if ( size == 1 ) val1 = (int)*CHARP(cp1, i);
else if ( size == 2 ) val1 = (int)*SHORTP(cp1, i);
else if ( size == 4 ) val1 = (int)*LONGP(cp1, i);
if ( size == 1 ) val2 = (int)*CHARP(cp2, i);
else if ( size == 2 ) val2 = (int)*SHORTP(cp2, i);
else if ( size == 4 ) val2 = (int)*LONGP(cp2, i);
int val1 = GETRAWSAMPLE(size, cp1, i);
int val2 = GETRAWSAMPLE(size, cp2, i);
if (size < 4) {
newval = val1 + val2;
@ -947,9 +952,7 @@ audioop_add(PyObject *self, PyObject *args)
newval = (int)floor(fbound(fval, minval, maxval));
}
if ( size == 1 ) *CHARP(ncp, i) = (signed char)newval;
else if ( size == 2 ) *SHORTP(ncp, i) = (short)newval;
else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)newval;
SETRAWSAMPLE(size, ncp, i, newval);
}
return rv;
}
@ -978,17 +981,27 @@ audioop_bias(PyObject *self, PyObject *args)
mask = masks[size];
for (i = 0; i < len; i += size) {
if ( size == 1 ) val = (unsigned int)(unsigned char)*CHARP(cp, i);
else if ( size == 2 ) val = (unsigned int)(unsigned short)*SHORTP(cp, i);
else if ( size == 4 ) val = (unsigned int)(Py_UInt32)*LONGP(cp, i);
if (size == 1)
val = GETINTX(unsigned char, cp, i);
else if (size == 2)
val = GETINTX(unsigned short, cp, i);
else if (size == 2)
val = ((unsigned int)GETINT24(cp, i)) & 0xffffffu;
else
val = GETINTX(PY_UINT32_T, cp, i);
val += (unsigned int)bias;
/* wrap around in case of overflow */
val &= mask;
if ( size == 1 ) *CHARP(ncp, i) = (signed char)(unsigned char)val;
else if ( size == 2 ) *SHORTP(ncp, i) = (short)(unsigned short)val;
else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(Py_UInt32)val;
if (size == 1)
SETINTX(unsigned char, ncp, i, val);
else if (size == 2)
SETINTX(unsigned short, ncp, i, val);
else if (size == 2)
SETINT24(ncp, i, (int)val);
else
SETINTX(PY_UINT32_T, ncp, i, val);
}
return rv;
}
@ -998,8 +1011,8 @@ audioop_reverse(PyObject *self, PyObject *args)
{
signed char *cp;
unsigned char *ncp;
Py_ssize_t len, i, j;
int size, val = 0;
Py_ssize_t len, i;
int size;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s#i:reverse",
@ -1015,15 +1028,8 @@ audioop_reverse(PyObject *self, PyObject *args)
ncp = (unsigned char *)PyBytes_AsString(rv);
for (i = 0; i < len; i += size) {
if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 24;
else if ( size == 2 ) val = ((int)*SHORTP(cp, i)) << 16;
else if ( size == 4 ) val = (int)*LONGP(cp, i);
j = len - i - size;
if ( size == 1 ) *CHARP(ncp, j) = (signed char)(val >> 24);
else if ( size == 2 ) *SHORTP(ncp, j) = (short)(val >> 16);
else if ( size == 4 ) *LONGP(ncp, j) = (Py_Int32)val;
int val = GETRAWSAMPLE(size, cp, i);
SETRAWSAMPLE(size, ncp, len - i - size, val);
}
return rv;
}
@ -1034,7 +1040,7 @@ audioop_lin2lin(PyObject *self, PyObject *args)
signed char *cp;
unsigned char *ncp;
Py_ssize_t len, i, j;
int size, size2, val = 0;
int size, size2;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s#ii:lin2lin",
@ -1056,14 +1062,9 @@ audioop_lin2lin(PyObject *self, PyObject *args)
return 0;
ncp = (unsigned char *)PyBytes_AsString(rv);
for ( i=0, j=0; i < len; i += size, j += size2 ) {
if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 24;
else if ( size == 2 ) val = ((int)*SHORTP(cp, i)) << 16;
else if ( size == 4 ) val = (int)*LONGP(cp, i);
if ( size2 == 1 ) *CHARP(ncp, j) = (signed char)(val >> 24);
else if ( size2 == 2 ) *SHORTP(ncp, j) = (short)(val >> 16);
else if ( size2 == 4 ) *LONGP(ncp, j) = (Py_Int32)val;
for (i = j = 0; i < len; i += size, j += size2) {
int val = GETSAMPLE32(size, cp, i);
SETSAMPLE32(size2, ncp, j, val);
}
return rv;
}
@ -1224,12 +1225,7 @@ audioop_ratecv(PyObject *self, PyObject *args)
}
for (chan = 0; chan < nchannels; chan++) {
prev_i[chan] = cur_i[chan];
if (size == 1)
cur_i[chan] = ((int)*CHARP(cp, 0)) << 24;
else if (size == 2)
cur_i[chan] = ((int)*SHORTP(cp, 0)) << 16;
else if (size == 4)
cur_i[chan] = (int)*LONGP(cp, 0);
cur_i[chan] = GETSAMPLE32(size, cp, 0);
cp += size;
/* implements a simple digital filter */
cur_i[chan] = (int)(
@ -1245,12 +1241,7 @@ audioop_ratecv(PyObject *self, PyObject *args)
cur_o = (int)(((double)prev_i[chan] * (double)d +
(double)cur_i[chan] * (double)(outrate - d)) /
(double)outrate);
if (size == 1)
*CHARP(ncp, 0) = (signed char)(cur_o >> 24);
else if (size == 2)
*SHORTP(ncp, 0) = (short)(cur_o >> 16);
else if (size == 4)
*LONGP(ncp, 0) = (Py_Int32)(cur_o);
SETSAMPLE32(size, ncp, 0, cur_o);
ncp += size;
}
d -= inrate;
@ -1268,7 +1259,7 @@ audioop_lin2ulaw(PyObject *self, PyObject *args)
signed char *cp;
unsigned char *ncp;
Py_ssize_t len, i;
int size, val = 0;
int size;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s#i:lin2ulaw",
@ -1284,11 +1275,8 @@ audioop_lin2ulaw(PyObject *self, PyObject *args)
ncp = (unsigned char *)PyBytes_AsString(rv);
for (i = 0; i < len; i += size) {
if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
else if ( size == 2 ) val = (int)*SHORTP(cp, i);
else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
*ncp++ = st_14linear2ulaw(val);
int val = GETSAMPLE32(size, cp, i);
*ncp++ = st_14linear2ulaw(val >> 18);
}
return rv;
}
@ -1297,10 +1285,9 @@ static PyObject *
audioop_ulaw2lin(PyObject *self, PyObject *args)
{
unsigned char *cp;
unsigned char cval;
signed char *ncp;
Py_ssize_t len, i;
int size, val;
int size;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s#i:ulaw2lin",
@ -1321,12 +1308,8 @@ audioop_ulaw2lin(PyObject *self, PyObject *args)
ncp = (signed char *)PyBytes_AsString(rv);
for (i = 0; i < len*size; i += size) {
cval = *cp++;
val = st_ulaw2linear16(cval);
if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val >> 8);
else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val);
else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(val<<16);
int val = st_ulaw2linear16(*cp++) << 16;
SETSAMPLE32(size, ncp, i, val);
}
return rv;
}
@ -1337,7 +1320,7 @@ audioop_lin2alaw(PyObject *self, PyObject *args)
signed char *cp;
unsigned char *ncp;
Py_ssize_t len, i;
int size, val = 0;
int size;
PyObject *rv;
if ( !PyArg_ParseTuple(args, "s#i:lin2alaw",
@ -1353,11 +1336,8 @@ audioop_lin2alaw(PyObject *self, PyObject *args)
ncp = (unsigned char *)PyBytes_AsString(rv);
for (i = 0; i < len; i += size) {
if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
else if ( size == 2 ) val = (int)*SHORTP(cp, i);
else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
*ncp++ = st_linear2alaw(val);
int val = GETSAMPLE32(size, cp, i);
*ncp++ = st_linear2alaw(val >> 19);
}
return rv;
}
@ -1366,7 +1346,6 @@ static PyObject *
audioop_alaw2lin(PyObject *self, PyObject *args)
{
unsigned char *cp;
unsigned char cval;
signed char *ncp;
Py_ssize_t len, i;
int size, val;
@ -1390,12 +1369,8 @@ audioop_alaw2lin(PyObject *self, PyObject *args)
ncp = (signed char *)PyBytes_AsString(rv);
for (i = 0; i < len*size; i += size) {
cval = *cp++;
val = st_alaw2linear16(cval);
if ( size == 1 ) *CHARP(ncp, i) = (signed char)(val >> 8);
else if ( size == 2 ) *SHORTP(ncp, i) = (short)(val);
else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(val<<16);
val = st_alaw2linear16(*cp++) << 16;
SETSAMPLE32(size, ncp, i, val);
}
return rv;
}
@ -1406,7 +1381,7 @@ audioop_lin2adpcm(PyObject *self, PyObject *args)
signed char *cp;
signed char *ncp;
Py_ssize_t len, i;
int size, val = 0, step, valpred, delta,
int size, step, valpred, delta,
index, sign, vpdiff, diff;
PyObject *rv, *state, *str;
int outputbuffer = 0, bufferstep;
@ -1435,14 +1410,17 @@ audioop_lin2adpcm(PyObject *self, PyObject *args)
bufferstep = 1;
for (i = 0; i < len; i += size) {
if ( size == 1 ) val = ((int)*CHARP(cp, i)) << 8;
else if ( size == 2 ) val = (int)*SHORTP(cp, i);
else if ( size == 4 ) val = ((int)*LONGP(cp, i)) >> 16;
int val = GETSAMPLE32(size, cp, i) >> 16;
/* Step 1 - compute difference with previous value */
if (val < valpred) {
diff = valpred - val;
sign = 8;
}
else {
diff = val - valpred;
sign = (diff < 0) ? 8 : 0;
if ( sign ) diff = (-diff);
sign = 0;
}
/* Step 2 - Divide and clamp */
/* Note:
@ -1511,7 +1489,7 @@ audioop_adpcm2lin(PyObject *self, PyObject *args)
{
signed char *cp;
signed char *ncp;
Py_ssize_t len, i;
Py_ssize_t len, i, outlen;
int size, valpred, step, delta, index, sign, vpdiff;
PyObject *rv, *str, *state;
int inputbuffer = 0, bufferstep;
@ -1536,7 +1514,8 @@ audioop_adpcm2lin(PyObject *self, PyObject *args)
"not enough memory for output buffer");
return 0;
}
str = PyBytes_FromStringAndSize(NULL, len*size*2);
outlen = len*size*2;
str = PyBytes_FromStringAndSize(NULL, outlen);
if ( str == 0 )
return 0;
ncp = (signed char *)PyBytes_AsString(str);
@ -1544,7 +1523,7 @@ audioop_adpcm2lin(PyObject *self, PyObject *args)
step = stepsizeTable[index];
bufferstep = 0;
for ( i=0; i < len*size*2; i += size ) {
for (i = 0; i < outlen; i += size) {
/* Step 1 - get the delta value and compute next index */
if ( bufferstep ) {
delta = inputbuffer & 0xf;
@ -1589,9 +1568,7 @@ audioop_adpcm2lin(PyObject *self, PyObject *args)
step = stepsizeTable[index];
/* Step 6 - Output value */
if ( size == 1 ) *CHARP(ncp, i) = (signed char)(valpred >> 8);
else if ( size == 2 ) *SHORTP(ncp, i) = (short)(valpred);
else if ( size == 4 ) *LONGP(ncp, i) = (Py_Int32)(valpred<<16);
SETSAMPLE32(size, ncp, i, valpred << 16);
}
rv = Py_BuildValue("(O(ii))", str, valpred, index);