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| 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=5) | |
| 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) | |