1 | #! /usr/bin/env python |
---|
2 | |
---|
3 | |
---|
4 | import numpy as np |
---|
5 | from numpy.testing import TestCase, assert_almost_equal |
---|
6 | import aubio |
---|
7 | |
---|
8 | precomputed_arange = [ 9.89949512, -6.44232273, 0., -0.67345482, 0., |
---|
9 | -0.20090288, 0., -0.05070186] |
---|
10 | |
---|
11 | precomputed_some_ones = [ 4.28539848, 0.2469689, -0.14625292, -0.58121818, |
---|
12 | -0.83483052, -0.75921834, -0.35168475, 0.24087936, |
---|
13 | 0.78539824, 1.06532764, 0.97632152, 0.57164496, 0.03688532, |
---|
14 | -0.39446154, -0.54619485, -0.37771079] |
---|
15 | |
---|
16 | class aubio_dct(TestCase): |
---|
17 | |
---|
18 | def test_init(self): |
---|
19 | """ test that aubio.dct() is created with expected size """ |
---|
20 | a_dct = aubio.dct() |
---|
21 | self.assertEqual(a_dct.size, 1024) |
---|
22 | |
---|
23 | def test_arange(self): |
---|
24 | """ test that dct(arange(8)) is computed correctly |
---|
25 | |
---|
26 | >>> from scipy.fftpack import dct |
---|
27 | >>> a_in = np.arange(8).astype(aubio.float_type) |
---|
28 | >>> precomputed = dct(a_in, norm='ortho') |
---|
29 | """ |
---|
30 | N = len(precomputed_arange) |
---|
31 | a_dct = aubio.dct(8) |
---|
32 | a_in = np.arange(8).astype(aubio.float_type) |
---|
33 | a_expected = aubio.fvec(precomputed_arange) |
---|
34 | assert_almost_equal(a_dct(a_in), a_expected, decimal=6) |
---|
35 | |
---|
36 | def test_some_ones(self): |
---|
37 | """ test that dct(somevector) is computed correctly """ |
---|
38 | a_dct = aubio.dct(16) |
---|
39 | a_in = np.ones(16).astype(aubio.float_type) |
---|
40 | a_in[1] = 0 |
---|
41 | a_in[3] = np.pi |
---|
42 | a_expected = aubio.fvec(precomputed_some_ones) |
---|
43 | assert_almost_equal(a_dct(a_in), a_expected, decimal=6) |
---|
44 | |
---|
45 | def test_reconstruction(self): |
---|
46 | """ test that some_ones vector can be recontructed """ |
---|
47 | a_dct = aubio.dct(16) |
---|
48 | a_in = np.ones(16).astype(aubio.float_type) |
---|
49 | a_in[1] = 0 |
---|
50 | a_in[3] = np.pi |
---|
51 | a_dct_in = a_dct(a_in) |
---|
52 | a_dct_reconstructed = a_dct.rdo(a_dct_in) |
---|
53 | assert_almost_equal(a_dct_reconstructed, a_in, decimal=6) |
---|
54 | |
---|
55 | def test_negative_size(self): |
---|
56 | """ test that creation fails with a negative size """ |
---|
57 | with self.assertRaises(ValueError): |
---|
58 | aubio.dct(-1) |
---|
59 | |
---|
60 | def test_wrong_size(self): |
---|
61 | """ test that creation fails with a non power-of-two size """ |
---|
62 | # supports for non 2** fft sizes only when compiled with fftw3 |
---|
63 | size = 13 |
---|
64 | try: |
---|
65 | with self.assertRaises(RuntimeError): |
---|
66 | aubio.dct(size) |
---|
67 | except AssertionError: |
---|
68 | self.skipTest('creating aubio.dct with size %d did not fail' % size) |
---|