tests/test_audio.py

import os
import unittest

from tests import get_tests_input_path, get_tests_output_path, get_tests_path

from TTS.utils.audio import AudioProcessor
from TTS.utils.io import load_config

TESTS_PATH = get_tests_path()
OUT_PATH = os.path.join(get_tests_output_path(), "audio_tests")
WAV_FILE = os.path.join(get_tests_input_path(), "example_1.wav")

os.makedirs(OUT_PATH, exist_ok=True)
conf = load_config(os.path.join(get_tests_input_path(), 'test_config.json'))


# pylint: disable=protected-access
class TestAudio(unittest.TestCase):
    def __init__(self, *args, **kwargs):
        super(TestAudio, self).__init__(*args, **kwargs)
        self.ap = AudioProcessor(**conf.audio)

    def test_audio_synthesis(self):
        """ 1. load wav
            2. set normalization parameters
            3. extract mel-spec
            4. invert to wav and save the output
        """
        print(" > Sanity check for the process wav -> mel -> wav")

        def _test(max_norm, signal_norm, symmetric_norm, clip_norm):
            self.ap.max_norm = max_norm
            self.ap.signal_norm = signal_norm
            self.ap.symmetric_norm = symmetric_norm
            self.ap.clip_norm = clip_norm
            wav = self.ap.load_wav(WAV_FILE)
            mel = self.ap.melspectrogram(wav)
            wav_ = self.ap.inv_melspectrogram(mel)
            file_name = "/audio_test-melspec_max_norm_{}-signal_norm_{}-symmetric_{}-clip_norm_{}.wav"\
                .format(max_norm, signal_norm, symmetric_norm, clip_norm)
            print(" | > Creating wav file at : ", file_name)
            self.ap.save_wav(wav_, OUT_PATH + file_name)

        # maxnorm = 1.0
        _test(1., False, False, False)
        _test(1., True, False, False)
        _test(1., True, True, False)
        _test(1., True, False, True)
        _test(1., True, True, True)
        # maxnorm = 4.0
        _test(4., False, False, False)
        _test(4., True, False, False)
        _test(4., True, True, False)
        _test(4., True, False, True)
        _test(4., True, True, True)

    def test_normalize(self):
        """Check normalization and denormalization for range values and consistency """
        print(" > Testing normalization and denormalization.")
        wav = self.ap.load_wav(WAV_FILE)
        wav = self.ap.sound_norm(wav)  # normalize audio to get abetter normalization range below.
        self.ap.signal_norm = False
        x = self.ap.melspectrogram(wav)
        x_old = x

        self.ap.signal_norm = True
        self.ap.symmetric_norm = False
        self.ap.clip_norm = False
        self.ap.max_norm = 4.0
        x_norm = self.ap.normalize(x)
        print(f" > MaxNorm: {self.ap.max_norm}, ClipNorm:{self.ap.clip_norm}, SymmetricNorm:{self.ap.symmetric_norm}, SignalNorm:{self.ap.signal_norm} Range-> {x_norm.max()} --  {x_norm.min()}")
        assert (x_old - x).sum() == 0
        # check value range
        assert x_norm.max() <= self.ap.max_norm + 1, x_norm.max()
        assert x_norm.min() >= 0 - 1, x_norm.min()
        # check denorm.
        x_ = self.ap.denormalize(x_norm)
        assert (x - x_).sum() < 1e-3, (x - x_).mean()

        self.ap.signal_norm = True
        self.ap.symmetric_norm = False
        self.ap.clip_norm = True
        self.ap.max_norm = 4.0
        x_norm = self.ap.normalize(x)
        print(f" > MaxNorm: {self.ap.max_norm}, ClipNorm:{self.ap.clip_norm}, SymmetricNorm:{self.ap.symmetric_norm}, SignalNorm:{self.ap.signal_norm} Range-> {x_norm.max()} --  {x_norm.min()}")


        assert (x_old - x).sum() == 0
        # check value range
        assert x_norm.max() <= self.ap.max_norm, x_norm.max()
        assert x_norm.min() >= 0, x_norm.min()
        # check denorm.
        x_ = self.ap.denormalize(x_norm)
        assert (x - x_).sum() < 1e-3, (x - x_).mean()

        self.ap.signal_norm = True
        self.ap.symmetric_norm = True
        self.ap.clip_norm = False
        self.ap.max_norm = 4.0
        x_norm = self.ap.normalize(x)
        print(f" > MaxNorm: {self.ap.max_norm}, ClipNorm:{self.ap.clip_norm}, SymmetricNorm:{self.ap.symmetric_norm}, SignalNorm:{self.ap.signal_norm} Range-> {x_norm.max()} --  {x_norm.min()}")


        assert (x_old - x).sum() == 0
        # check value range
        assert x_norm.max() <= self.ap.max_norm + 1, x_norm.max()
        assert x_norm.min() >= -self.ap.max_norm - 2, x_norm.min()  #pylint: disable=invalid-unary-operand-type
        assert x_norm.min() <= 0, x_norm.min()
        # check denorm.
        x_ = self.ap.denormalize(x_norm)
        assert (x - x_).sum() < 1e-3, (x - x_).mean()

        self.ap.signal_norm = True
        self.ap.symmetric_norm = True
        self.ap.clip_norm = True
        self.ap.max_norm = 4.0
        x_norm = self.ap.normalize(x)
        print(f" > MaxNorm: {self.ap.max_norm}, ClipNorm:{self.ap.clip_norm}, SymmetricNorm:{self.ap.symmetric_norm}, SignalNorm:{self.ap.signal_norm} Range-> {x_norm.max()} --  {x_norm.min()}")


        assert (x_old - x).sum() == 0
        # check value range
        assert x_norm.max() <= self.ap.max_norm, x_norm.max()
        assert x_norm.min() >= -self.ap.max_norm, x_norm.min()  #pylint: disable=invalid-unary-operand-type
        assert x_norm.min() <= 0, x_norm.min()
        # check denorm.
        x_ = self.ap.denormalize(x_norm)
        assert (x - x_).sum() < 1e-3, (x - x_).mean()

        self.ap.signal_norm = True
        self.ap.symmetric_norm = False
        self.ap.max_norm = 1.0
        x_norm = self.ap.normalize(x)
        print(f" > MaxNorm: {self.ap.max_norm}, ClipNorm:{self.ap.clip_norm}, SymmetricNorm:{self.ap.symmetric_norm}, SignalNorm:{self.ap.signal_norm} Range-> {x_norm.max()} --  {x_norm.min()}")


        assert (x_old - x).sum() == 0
        assert x_norm.max() <= self.ap.max_norm, x_norm.max()
        assert x_norm.min() >= 0, x_norm.min()
        x_ = self.ap.denormalize(x_norm)
        assert (x - x_).sum() < 1e-3

        self.ap.signal_norm = True
        self.ap.symmetric_norm = True
        self.ap.max_norm = 1.0
        x_norm = self.ap.normalize(x)
        print(f" > MaxNorm: {self.ap.max_norm}, ClipNorm:{self.ap.clip_norm}, SymmetricNorm:{self.ap.symmetric_norm}, SignalNorm:{self.ap.signal_norm} Range-> {x_norm.max()} --  {x_norm.min()}")


        assert (x_old - x).sum() == 0
        assert x_norm.max() <= self.ap.max_norm, x_norm.max()
        assert x_norm.min() >= -self.ap.max_norm, x_norm.min()  #pylint: disable=invalid-unary-operand-type
        assert x_norm.min() < 0, x_norm.min()
        x_ = self.ap.denormalize(x_norm)
        assert (x - x_).sum() < 1e-3

    def test_scaler(self):
        scaler_stats_path = os.path.join(get_tests_input_path(), 'scale_stats.npy')
        conf.audio['stats_path'] = scaler_stats_path
        conf.audio['preemphasis'] = 0.0
        conf.audio['do_trim_silence'] = True
        conf.audio['signal_norm'] = True

        ap = AudioProcessor(**conf.audio)
        mel_mean, mel_std, linear_mean, linear_std, _ = ap.load_stats(scaler_stats_path)
        ap.setup_scaler(mel_mean, mel_std, linear_mean, linear_std)

        self.ap.signal_norm = False
        self.ap.preemphasis = 0.0

        # test scaler forward and backward transforms
        wav = self.ap.load_wav(WAV_FILE)
        mel_reference = self.ap.melspectrogram(wav)
        mel_norm = ap.melspectrogram(wav)
        mel_denorm = ap.denormalize(mel_norm)
        assert abs(mel_reference - mel_denorm).max() < 1e-4