source: python/tests/test_pitchshift.py @ 04fc360

#! /usr/bin/env python

from numpy.testing import TestCase
from nose2.tools import params
import numpy as np
import aubio

class aubio_pitchshift(TestCase):

    def setUp(self):
        try:
            self.o = aubio.pitchshift(hop_size = 128)
        except RuntimeError as e:
            self.skipTest("creating aubio.pitchshift failed (recompile with rubberband?)")

    def test_default_creation(self):
        self.assertEqual(self.o.get_pitchscale(), 1)
        self.assertEqual(self.o.get_transpose(), 0)

    def test_on_zeros(self):
        test_length = self.o.hop_size * 100
        read = 0
        # test on zeros
        vec = aubio.fvec(self.o.hop_size)
        transpose_range = 24
        while read < test_length:
            # transpose the samples
            out = self.o(vec)
            self.assertTrue((out == 0).all())
            # position in the file (between 0. and 1.)
            percent_read = read / float(test_length)
            # variable transpose rate (in semitones)
            transpose = 2 * transpose_range * percent_read - transpose_range
            # set transpose rate
            self.o.set_transpose(transpose)
            read += len(vec)

    def test_on_ones(self):
        test_length = self.o.hop_size * 100
        read = 0
        # test on zeros
        vec = aubio.fvec(self.o.hop_size) + 1
        transpose_range = 1.24
        while read < test_length:
            # transpose the samples
            out = self.o(vec)
            # position in the file (between 0. and 1.)
            percent_read = read / float(test_length)
            # variable transpose rate (in semitones)
            transpose = 2 * transpose_range * percent_read - transpose_range
            # set transpose rate
            self.o.set_transpose(transpose)
            read += len(vec)

    def test_transpose_too_high(self):
        with self.assertRaises(ValueError):
            self.o.set_transpose(24.3)

    def test_transpose_too_low(self):
        with self.assertRaises(ValueError):
            self.o.set_transpose(-24.3)


class aubio_pitchshift_testruns(TestCase):

    @params(
            ("default",     1.2,  128,  44100),
            ("crispness:0", 0.43,  64,   8000),
            ("crispness:3", 0.53, 256,   8000),
            ("crispness:3", 1.53, 512,   8000),
            ("crispness:6", 2.3, 4096, 192000),
            )
    def test_run_with_params(self, mode, pitchscale, hop_size, samplerate):
        self.o = aubio.pitchshift(mode, pitchscale, hop_size, samplerate)
        test_length = self.o.hop_size * 50
        read = 0
        # test on random
        vec = np.random.rand(self.o.hop_size).astype(aubio.float_type)
        transpose_range = self.o.get_transpose()
        while read < test_length:
            # transpose the samples
            out = self.o(vec)
            # position in the file (between 0. and 1.)
            percent_read = read / float(test_length)
            # variable transpose rate (in semitones)
            transpose =  transpose_range - 2 * transpose_range * percent_read
            # set transpose rate
            self.o.set_transpose(transpose)
            read += len(vec)

if __name__ == '__main__':
    from nose2 import main
    main()