ref: 274839fbaabb20bb8ad05ef54855dcf5ea85bd49
dir: /tests/python/fft.py/
import unittest
import math
from aubio.aubiowrapper import *
buf_size = 8092
channels = 4
precision = 6
class aubio_mfft_test_case(unittest.TestCase):
def setUp(self):
self.o = new_aubio_mfft(buf_size, channels)
def tearDown(self):
del_aubio_mfft(self.o)
def test_create(self):
""" test creation and deletion of fft object """
pass
def test_aubio_mfft_do_zeroes(self):
""" test aubio_mfft_do on zeroes """
input = new_fvec(buf_size, channels)
fftgrain = new_cvec(buf_size, channels)
for index in range(buf_size):
for channel in range(channels):
self.assertEqual(0., fvec_read_sample(input, channel, index))
aubio_mfft_do(self.o, input, fftgrain)
for index in range(buf_size/2+1):
for channel in range(channels):
self.assertEqual(0., cvec_read_norm(fftgrain, channel, index))
for index in range(buf_size/2+1):
for channel in range(channels):
self.assertEqual(0., cvec_read_phas(fftgrain, channel, index))
del fftgrain
del input
def test_aubio_mfft_rdo_zeroes(self):
""" test aubio_mfft_rdo on zeroes """
fftgrain = new_cvec(buf_size, channels)
output = new_fvec(buf_size, channels)
aubio_mfft_rdo(self.o, fftgrain, output)
# check output
for index in range(buf_size):
for channel in range(channels):
self.assertEqual(0., fvec_read_sample(output, channel, index))
del fftgrain
del output
def test_aubio_mfft_do_impulse(self):
""" test aubio_mfft_do with an impulse on one channel """
input = new_fvec(buf_size, channels)
fftgrain = new_cvec(buf_size, channels)
# write impulse in channel 0, sample 0.
some_constant = 0.3412432456
fvec_write_sample(input, some_constant, 0, 0)
aubio_mfft_do(self.o, input, fftgrain)
# check norm
for index in range(buf_size/2+1):
self.assertAlmostEqual(some_constant, cvec_read_norm(fftgrain, 0, index), precision)
for index in range(buf_size/2+1):
for channel in range(1, channels):
self.assertEqual(0., cvec_read_norm(fftgrain, channel, index))
# check phas
for index in range(buf_size/2+1):
for channel in range(channels):
self.assertEqual(0., cvec_read_phas(fftgrain, channel, index))
del fftgrain
del input
def test_aubio_mfft_do_constant(self):
""" test aubio_mfft_do with a constant on one channel """
input = new_fvec(buf_size, channels)
fftgrain = new_cvec(buf_size, channels)
# write impulse in channel 0, sample 0.
some_constant = 0.003412432456
for index in range(1,buf_size):
fvec_write_sample(input, some_constant, 0, index)
aubio_mfft_do(self.o, input, fftgrain)
# check norm and phase == 0 in all other channels
for index in range(buf_size/2+1):
for channel in range(1, channels):
self.assertEqual(0., cvec_read_norm(fftgrain, channel, index))
# check norm and phase == 0 in first first and last bin of first channel
self.assertAlmostEqual((buf_size-1)*some_constant, cvec_read_norm(fftgrain, 0, 0), precision)
self.assertEqual(0., cvec_read_phas(fftgrain, 0, 0))
self.assertEqual(0., cvec_read_norm(fftgrain, 0, buf_size/2+1))
self.assertEqual(0., cvec_read_phas(fftgrain, 0, buf_size/2+1))
# check unwrap2pi(phas) ~= pi everywhere but in first bin
for index in range(1,buf_size/2+1):
self.assertAlmostEqual ( math.pi, aubio_unwrap2pi(cvec_read_phas(fftgrain, 0, index)), precision)
self.assertAlmostEqual(some_constant, cvec_read_norm(fftgrain, 0, index), precision)
del fftgrain
del input
def test_aubio_mfft_do_impulse_multichannel(self):
" test aubio_mfft_do on impulse two channels "
input = new_fvec(buf_size, channels)
fftgrain = new_cvec(buf_size, channels)
# put an impulse in first an last channel, at first and last index
fvec_write_sample(input, 1., 0, 0)
fvec_write_sample(input, 1., channels-1, 0)
aubio_mfft_do(self.o, input, fftgrain)
# check the norm
for index in range(buf_size/2+1):
self.assertEqual(1., cvec_read_norm(fftgrain, 0, index))
for index in range(buf_size/2+1):
for channel in range(1, channels-1):
self.assertEqual(0., cvec_read_norm(fftgrain, channel, index))
for index in range(buf_size/2+1):
self.assertEqual(1., cvec_read_norm(fftgrain, channels-1, index))
# check the phase
for index in range(buf_size/2+1):
for channel in range(channels):
self.assertEqual(0., cvec_read_phas(fftgrain, channel, index))
del fftgrain
del input
def test_aubio_mfft_rdo_impulse(self):
""" test aubio_mfft_rdo on impulse """
fftgrain = new_cvec(buf_size, channels)
for channel in range(channels):
cvec_write_norm(fftgrain, 1., channel, 0)
output = new_fvec(buf_size, channels)
aubio_mfft_rdo(self.o, fftgrain, output)
for index in range(buf_size/2+1):
for channel in range(channels):
self.assertAlmostEqual(fvec_read_sample(output, channel, index), 1./buf_size, precision)
del fftgrain
del output
def test_aubio_mfft_do_back_and_forth(self):
""" test aubio_mfft_rdo on a constant """
input = new_fvec(buf_size, channels)
output = new_fvec(buf_size, channels)
fftgrain = new_cvec(buf_size, channels)
for index in range(buf_size/2+1):
for channel in range(channels):
fvec_write_sample(input, 0.67, channel, index)
aubio_mfft_do(self.o, input, fftgrain)
aubio_mfft_rdo(self.o, fftgrain, output)
for index in range(buf_size/2+1):
for channel in range(channels):
self.assertAlmostEqual(fvec_read_sample(output, channel, index), 0.67, precision)
del fftgrain
del output
if __name__ == '__main__': unittest.main()