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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) | ||