ref: 2bf590427e2a1f227be0a6391e025af3fc0ff2c0
parent: 9338e18e3de7c249fe3d28333301483aba2bb7e7
author: Paul Brossier <piem@piem.org>
date: Sat Sep 16 19:44:54 EDT 2017
python/tests/test_dct.py: add full tests
--- /dev/null
+++ b/python/tests/test_dct.py
@@ -1,0 +1,61 @@
+#! /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)