python/tests/test_filterbank.py

   1 #! /usr/bin/env python
   2
   3 import numpy as np
   4 from numpy.testing import TestCase, assert_equal, assert_almost_equal
   5
   6 from aubio import cvec, filterbank, float_type
   7 from utils import array_from_text_file
   8
   9 class aubio_filterbank_test_case(TestCase):
  10
  11     def test_members(self):
  12         f = filterbank(40, 512)
  13         assert_equal ([f.n_filters, f.win_s], [40, 512])
  14
  15     def test_set_coeffs(self):
  16         f = filterbank(40, 512)
  17         r = np.random.random([40, int(512 / 2) + 1]).astype(float_type)
  18         f.set_coeffs(r)
  19         assert_equal (r, f.get_coeffs())
  20
  21     def test_phase(self):
  22         f = filterbank(40, 512)
  23         c = cvec(512)
  24         c.phas[:] = np.pi
  25         assert_equal( f(c), 0);
  26
  27     def test_norm(self):
  28         f = filterbank(40, 512)
  29         c = cvec(512)
  30         c.norm[:] = 1
  31         assert_equal( f(c), 0);
  32
  33     def test_random_norm(self):
  34         f = filterbank(40, 512)
  35         c = cvec(512)
  36         c.norm[:] = np.random.random((int(512 / 2) + 1,)).astype(float_type)
  37         assert_equal( f(c), 0)
  38
  39     def test_random_coeffs(self):
  40         win_s = 128
  41         f = filterbank(40, win_s)
  42         c = cvec(win_s)
  43         r = np.random.random([40, int(win_s / 2) + 1]).astype(float_type)
  44         r /= r.sum()
  45         f.set_coeffs(r)
  46         c.norm[:] = np.random.random((int(win_s / 2) + 1,)).astype(float_type)
  47         assert_equal ( f(c) < 1., True )
  48         assert_equal ( f(c) > 0., True )
  49
  50     def test_mfcc_coeffs(self):
  51         f = filterbank(40, 512)
  52         c = cvec(512)
  53         f.set_mel_coeffs_slaney(44100)
  54         c.norm[:] = np.random.random((int(512 / 2) + 1,)).astype(float_type)
  55         assert_equal ( f(c) < 1., True )
  56         assert_equal ( f(c) > 0., True )
  57
  58     def test_mfcc_coeffs_16000(self):
  59         expected = array_from_text_file('filterbank_mfcc_16000_512.expected')
  60         f = filterbank(40, 512)
  61         f.set_mel_coeffs_slaney(16000)
  62         assert_almost_equal ( expected, f.get_coeffs() )
  63
  64     def test_mfcc_coeffs_get_coeffs(self):
  65         f = filterbank(40, 512)
  66         coeffs = f.get_coeffs()
  67         self.assertIsInstance(coeffs, np.ndarray)
  68         assert_equal (coeffs, 0)
  69         assert_equal (np.shape(coeffs), (40, 512 / 2 + 1))
  70
  71 class aubio_filterbank_wrong_values(TestCase):
  72
  73     def test_negative_window(self):
  74         self.assertRaises(ValueError, filterbank, 40, -20)
  75
  76     def test_negative_filters(self):
  77         self.assertRaises(ValueError, filterbank, -40, 1024)
  78
  79     def test_filterbank_long_cvec(self):
  80         f = filterbank(40, 512)
  81         with self.assertRaises(ValueError):
  82             f(cvec(1024))
  83
  84     def test_filterbank_short_cvec(self):
  85         f = filterbank(40, 512)
  86         with self.assertRaises(ValueError):
  87             f(cvec(256))
  88
  89 if __name__ == '__main__':
  90     from unittest import main
  91     main()