ref: 2bf590427e2a1f227be0a6391e025af3fc0ff2c0
dir: /python/tests/test_dct.py/
#! /usr/bin/env python import numpy as np from numpy.testing import TestCase, assert_almost_equal import aubio class aubio_dct(TestCase): def test_init(self): """ check aubio.dct() can be created """ a_dct = aubio.dct() self.assertEqual(a_dct.size, 1024) def test_arange(self): """ test that dct(arange(8)) is computed correctly >>> from scipy.fftpack import dct >>> a_in = np.arange(8).astype('float32') >>> precomputed = dct(a_in, norm='ortho') """ precomputed = [ 9.89949512, -6.44232273, 0., -0.67345482, 0., -0.20090288, 0., -0.05070186] a_dct = aubio.dct(8) a_in = np.arange(8).astype('float32') a_expected = aubio.fvec(precomputed) assert_almost_equal(a_dct(a_in), a_expected, decimal=6) def test_some_ones(self): """ test that dct(somevector) is computed correctly """ precomputed = [ 4.28539848, 0.2469689, -0.14625292, -0.58121818, -0.83483052, -0.75921834, -0.35168475, 0.24087936, 0.78539824, 1.06532764, 0.97632152, 0.57164496, 0.03688532, -0.39446154, -0.54619485, -0.37771079] a_dct = aubio.dct(16) a_in = np.ones(16).astype('float32') a_in[1] = 0 a_in[3] = np.pi a_expected = aubio.fvec(precomputed) assert_almost_equal(a_dct(a_in), a_expected, decimal=7) def test_reconstruction(self): a_dct = aubio.dct(16) a_in = np.ones(16).astype('float32') a_in[1] = 0 a_in[3] = np.pi a_dct_in = a_dct(a_in) a_dct_reconstructed = a_dct.rdo(a_dct_in) assert_almost_equal(a_dct_reconstructed, a_in, decimal=6) def test_negative_size(self): with self.assertRaises(ValueError): aubio.dct(-1) def test_wrong_size(self): # supports for non 2** fft sizes only when compiled with fftw3 try: with self.assertRaises(RuntimeError): aubio.dct(13) except AssertionError: self.skipTest('creating aubio.dct with size %d did not fail' % win_s)