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import os
import tempfile
import numpy as np
from numpy.testing import assert_equal, assert_, assert_raises, assert_array_equal
from scipy.io import wavfile
def datafile(fn):
return os.path.join(os.path.dirname(__file__), 'data', fn)
def test_read_1():
rate, data = wavfile.read(datafile('test-44100-le-1ch-4bytes.wav'))
assert_equal(rate, 44100)
assert_(np.issubdtype(data.dtype, np.int32))
assert_equal(data.shape, (4410,))
def test_read_2():
rate, data = wavfile.read(datafile('test-8000-le-2ch-1byteu.wav'))
assert_equal(rate, 8000)
assert_(np.issubdtype(data.dtype, np.uint8))
assert_equal(data.shape, (800, 2))
def test_read_fail():
assert_raises(ValueError, wavfile.read, datafile('example_1.nc'))
def _check_roundtrip(rate, dtype, channels):
fd, tmpfile = tempfile.mkstemp(suffix='.wav')
try:
os.close(fd)
data = np.random.rand(100, channels)
if channels == 1:
data = data[:,0]
data = (data*128).astype(dtype)
wavfile.write(tmpfile, rate, data)
rate2, data2 = wavfile.read(tmpfile)
assert_equal(rate, rate2)
assert_(data2.dtype.byteorder in ('<', '=', '|'), msg=data2.dtype)
assert_array_equal(data, data2)
finally:
os.unlink(tmpfile)
def test_write_roundtrip():
for signed in ('i', 'u'):
for size in (1, 2, 4, 8):
if size == 1 and signed == 'i':
# signed 8-bit integer PCM is not allowed
continue
for endianness in ('>', '<'):
if size == 1 and endianness == '<':
continue
for rate in (8000, 32000):
for channels in (1, 2, 5):
dt = np.dtype('%s%s%d' % (endianness, signed, size))
yield _check_roundtrip, rate, dt, channels
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