import librosa
import numpy as np
import os
import pyworld
def load_wavs(wav_dir, sr):
wavs = list()
for file in os.listdir(wav_dir):
file_path = os.path.join(wav_dir, file)
wav, _ = librosa.load(file_path, sr = sr, mono = True)
#wav = wav.astype(np.float64)
wavs.append(wav)
return wavs
def world_decompose(wav, fs, frame_period = 5.0):
# Decompose speech signal into f0, spectral envelope and aperiodicity using WORLD
wav = wav.astype(np.float64)
f0, timeaxis = pyworld.harvest(wav, fs, frame_period = frame_period, f0_floor = 71.0, f0_ceil = 800.0)
sp = pyworld.cheaptrick(wav, f0, timeaxis, fs)
ap = pyworld.d4c(wav, f0, timeaxis, fs)
return f0, timeaxis, sp, ap
def world_encode_spectral_envelop(sp, fs, dim = 24):
# Get Mel-cepstral coefficients (MCEPs)
#sp = sp.astype(np.float64)
coded_sp = pyworld.code_spectral_envelope(sp, fs, dim)
return coded_sp
def world_decode_spectral_envelop(coded_sp, fs):
fftlen = pyworld.get_cheaptrick_fft_size(fs)
#coded_sp = coded_sp.astype(np.float32)
#coded_sp = np.ascontiguousarray(coded_sp)
decoded_sp = pyworld.decode_spectral_envelope(coded_sp, fs, fftlen)
return decoded_sp
def world_encode_data(wavs, fs, frame_period = 5.0, coded_dim = 24):
f0s = list()
timeaxes = list()
sps = list()
aps = list()
coded_sps = list()
for wav in wavs:
f0, timeaxis, sp, ap = world_decompose(wav = wav, fs = fs, frame_period = frame_period)
coded_sp = world_encode_spectral_envelop(sp = sp, fs = fs, dim = coded_dim)
f0s.append(f0)
timeaxes.append(timeaxis)
sps.append(sp)
aps.append(ap)
coded_sps.append(coded_sp)
return f0s, timeaxes, sps, aps, coded_sps
def transpose_in_list(lst):
transposed_lst = list()
for array in lst:
transposed_lst.append(array.T)
return transposed_lst
def world_decode_data(coded_sps, fs):
decoded_sps = list()
for coded_sp in coded_sps:
decoded_sp = world_decode_spectral_envelop(coded_sp, fs)
decoded_sps.append(decoded_sp)
return decoded_sps
def world_speech_synthesis(f0, decoded_sp, ap, fs, frame_period):
#decoded_sp = decoded_sp.astype(np.float64)
wav = pyworld.synthesize(f0, decoded_sp, ap, fs, frame_period)
# Librosa could not save wav if not doing so
wav = wav.astype(np.float32)
return wav
def world_synthesis_data(f0s, decoded_sps, aps, fs, frame_period):
wavs = list()
for f0, decoded_sp, ap in zip(f0s, decoded_sps, aps):
wav = world_speech_synthesis(f0, decoded_sp, ap, fs, frame_period)
wavs.append(wav)
return wavs
def coded_sps_normalization_fit_transoform(coded_sps):
coded_sps_concatenated = np.concatenate(coded_sps, axis = 1)
coded_sps_mean = np.mean(coded_sps_concatenated, axis = 1, keepdims = True)
coded_sps_std = np.std(coded_sps_concatenated, axis = 1, keepdims = True)
coded_sps_normalized = list()
for coded_sp in coded_sps:
coded_sps_normalized.append((coded_sp - coded_sps_mean) / coded_sps_std)
return coded_sps_normalized, coded_sps_mean, coded_sps_std
def coded_sps_normalization_transoform(coded_sps, coded_sps_mean, coded_sps_std):
coded_sps_normalized = list()
for coded_sp in coded_sps:
coded_sps_normalized.append((coded_sp - coded_sps_mean) / coded_sps_std)
return coded_sps_normalized
def coded_sps_normalization_inverse_transoform(normalized_coded_sps, coded_sps_mean, coded_sps_std):
coded_sps = list()
for normalized_coded_sp in normalized_coded_sps:
coded_sps.append(normalized_coded_sp * coded_sps_std + coded_sps_mean)
return coded_sps
def coded_sp_padding(coded_sp, multiple = 4):
num_features = coded_sp.shape[0]
num_frames = coded_sp.shape[1]
num_frames_padded = int(np.ceil(num_frames / multiple)) * multiple
num_frames_diff = num_frames_padded - num_frames
num_pad_left = num_frames_diff // 2
num_pad_right = num_frames_diff - num_pad_left
coded_sp_padded = np.pad(coded_sp, ((0, 0), (num_pad_left, num_pad_right)), 'constant', constant_values = 0)
return coded_sp_padded
def wav_padding(wav, sr, frame_period, multiple = 4):
assert wav.ndim == 1
num_frames = len(wav)
num_frames_padded = int((np.ceil((np.floor(num_frames / (sr * frame_period / 1000)) + 1) / multiple + 1) * multiple - 1) * (sr * frame_period / 1000))
num_frames_diff = num_frames_padded - num_frames
num_pad_left = num_frames_diff // 2
num_pad_right = num_frames_diff - num_pad_left
wav_padded = np.pad(wav, (num_pad_left, num_pad_right), 'constant', constant_values = 0)
return wav_padded
def logf0_statistics(f0s):
log_f0s_concatenated = np.ma.log(np.concatenate(f0s))
log_f0s_mean = log_f0s_concatenated.mean()
log_f0s_std = log_f0s_concatenated.std()
return log_f0s_mean, log_f0s_std
def pitch_conversion(f0, mean_log_src, std_log_src, mean_log_target, std_log_target):
# Logarithm Gaussian normalization for Pitch Conversions
f0_converted = np.exp((np.log(f0) - mean_log_src) / std_log_src * std_log_target + mean_log_target)
return f0_converted
def wavs_to_specs(wavs, n_fft = 1024, hop_length = None):
stfts = list()
for wav in wavs:
stft = librosa.stft(wav, n_fft = n_fft, hop_length = hop_length)
stfts.append(stft)
return stfts
def wavs_to_mfccs(wavs, sr, n_fft = 1024, hop_length = None, n_mels = 128, n_mfcc = 24):
mfccs = list()
for wav in wavs:
mfcc = librosa.feature.mfcc(y = wav, sr = sr, n_fft = n_fft, hop_length = hop_length, n_mels = n_mels, n_mfcc = n_mfcc)
mfccs.append(mfcc)
return mfccs
def mfccs_normalization(mfccs):
mfccs_concatenated = np.concatenate(mfccs, axis = 1)
mfccs_mean = np.mean(mfccs_concatenated, axis = 1, keepdims = True)
mfccs_std = np.std(mfccs_concatenated, axis = 1, keepdims = True)
mfccs_normalized = list()
for mfcc in mfccs:
mfccs_normalized.append((mfcc - mfccs_mean) / mfccs_std)
return mfccs_normalized, mfccs_mean, mfccs_std
def sample_train_data(dataset_A, dataset_B, n_frames = 128):
num_samples = min(len(dataset_A), len(dataset_B))
train_data_A_idx = np.arange(len(dataset_A))
train_data_B_idx = np.arange(len(dataset_B))
np.random.shuffle(train_data_A_idx)
np.random.shuffle(train_data_B_idx)
train_data_A_idx_subset = train_data_A_idx[:num_samples]
train_data_B_idx_subset = train_data_B_idx[:num_samples]
train_data_A = list()
train_data_B = list()
for idx_A, idx_B in zip(train_data_A_idx_subset, train_data_B_idx_subset):
data_A = dataset_A[idx_A]
frames_A_total = data_A.shape[1]
assert frames_A_total >= n_frames
start_A = np.random.randint(frames_A_total - n_frames + 1)
end_A = start_A + n_frames
train_data_A.append(data_A[:,start_A:end_A])
data_B = dataset_B[idx_B]
frames_B_total = data_B.shape[1]
assert frames_B_total >= n_frames
start_B = np.random.randint(frames_B_total - n_frames + 1)
end_B = start_B + n_frames
train_data_B.append(data_B[:,start_B:end_B])
train_data_A = np.array(train_data_A)
train_data_B = np.array(train_data_B)
return train_data_A, train_data_B
