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| import librosa | |
| import librosa.filters | |
| import numpy as np | |
| # import tensorflow as tf | |
| from scipy import signal | |
| from scipy.io import wavfile | |
| hp_num_mels = 80 | |
| hp_rescale = True | |
| hp_rescaling_max = 0.9 | |
| hp_use_lws = False | |
| hp_n_fft = 800 | |
| hp_hop_size = 200 | |
| hp_win_size = 800 | |
| hp_sample_rate = 16000 | |
| hp_frame_shift_ms = None | |
| hp_signal_normalization = True | |
| hp_allow_clipping_in_normalization = True | |
| hp_symmetric_mels = True | |
| hp_max_abs_value = 4.0 | |
| hp_preemphasize = True | |
| hp_preemphasis = 0.97 | |
| hp_min_level_db = -100 | |
| hp_ref_level_db = 20 | |
| hp_fmin = 55 | |
| hp_fmax = 7600 | |
| def load_wav(path, sr): | |
| return librosa.core.load(path, sr=sr)[0] | |
| def save_wav(wav, path, sr): | |
| wav *= 32767 / max(0.01, np.max(np.abs(wav))) | |
| # proposed by @dsmiller | |
| wavfile.write(path, sr, wav.astype(np.int16)) | |
| def save_wavenet_wav(wav, path, sr): | |
| librosa.output.write_wav(path, wav, sr=sr) | |
| def preemphasis(wav, k, preemphasize=True): | |
| if preemphasize: | |
| return signal.lfilter([1, -k], [1], wav) | |
| return wav | |
| def inv_preemphasis(wav, k, inv_preemphasize=True): | |
| if inv_preemphasize: | |
| return signal.lfilter([1], [1, -k], wav) | |
| return wav | |
| def get_hop_size(): | |
| hop_size = hp_hop_size | |
| if hop_size is None: | |
| assert hp_frame_shift_ms is not None | |
| hop_size = int(hp_frame_shift_ms / 1000 * hp_sample_rate) | |
| return hop_size | |
| def linearspectrogram(wav): | |
| D = _stft(preemphasis(wav, hp_preemphasis, hp_preemphasize)) | |
| S = _amp_to_db(np.abs(D)) - hp_ref_level_db | |
| if hp_signal_normalization: | |
| return _normalize(S) | |
| return S | |
| def melspectrogram(wav): | |
| D = _stft(preemphasis(wav, hp_preemphasis, hp_preemphasize)) | |
| S = _amp_to_db(_linear_to_mel(np.abs(D))) - hp_ref_level_db | |
| if hp_signal_normalization: | |
| return _normalize(S) | |
| return S | |
| def _lws_processor(): | |
| import lws | |
| return lws.lws(hp_n_fft, get_hop_size(), fftsize=hp_win_size, mode="speech") | |
| def _stft(y): | |
| if hp_use_lws: | |
| return _lws_processor(hp).stft(y).T | |
| else: | |
| return librosa.stft(y=y, n_fft=hp_n_fft, hop_length=get_hop_size(), win_length=hp_win_size) | |
| ########################################################## | |
| # Those are only correct when using lws!!! (This was messing with Wavenet quality for a long time!) | |
| def num_frames(length, fsize, fshift): | |
| """Compute number of time frames of spectrogram""" | |
| pad = fsize - fshift | |
| if length % fshift == 0: | |
| M = (length + pad * 2 - fsize) // fshift + 1 | |
| else: | |
| M = (length + pad * 2 - fsize) // fshift + 2 | |
| return M | |
| def pad_lr(x, fsize, fshift): | |
| """Compute left and right padding""" | |
| M = num_frames(len(x), fsize, fshift) | |
| pad = fsize - fshift | |
| T = len(x) + 2 * pad | |
| r = (M - 1) * fshift + fsize - T | |
| return pad, pad + r | |
| ########################################################## | |
| # Librosa correct padding | |
| def librosa_pad_lr(x, fsize, fshift): | |
| return 0, (x.shape[0] // fshift + 1) * fshift - x.shape[0] | |
| # Conversions | |
| _mel_basis = None | |
| def _linear_to_mel(spectogram): | |
| global _mel_basis | |
| if _mel_basis is None: | |
| _mel_basis = _build_mel_basis() | |
| return np.dot(_mel_basis, spectogram) | |
| def _build_mel_basis(): | |
| assert hp_fmax <= hp_sample_rate // 2 | |
| return librosa.filters.mel(hp_sample_rate, hp_n_fft, n_mels=hp_num_mels, fmin=hp_fmin, fmax=hp_fmax) | |
| def _amp_to_db(x): | |
| min_level = np.exp(hp_min_level_db / 20 * np.log(10)) | |
| return 20 * np.log10(np.maximum(min_level, x)) | |
| def _normalize(S): | |
| if hp_allow_clipping_in_normalization: | |
| if hp_symmetric_mels: | |
| return np.clip( | |
| (2 * hp_max_abs_value) * ((S - hp_min_level_db) / (-hp_min_level_db)) - hp_max_abs_value, | |
| -hp_max_abs_value, | |
| hp_max_abs_value, | |
| ) | |
| else: | |
| return np.clip( | |
| hp_max_abs_value * ((S - hp_min_level_db) / (-hp_min_level_db)), | |
| 0, | |
| hp_max_abs_value, | |
| ) | |
| assert S.max() <= 0 and S.min() - hp_min_level_db >= 0 | |
| if hp_symmetric_mels: | |
| return (2 * hp_max_abs_value) * ((S - hp_min_level_db) / (-hp_min_level_db)) - hp_max_abs_value | |
| else: | |
| return hp_max_abs_value * ((S - hp_min_level_db) / (-hp_min_level_db)) | |