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80 lines
2.9 KiB
80 lines
2.9 KiB
import torch
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from librosa.filters import mel as librosa_mel_fn
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from audio_processing import dynamic_range_compression
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from audio_processing import dynamic_range_decompression
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from stft import STFT
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class LinearNorm(torch.nn.Module):
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def __init__(self, in_dim, out_dim, bias=True, w_init_gain='linear'):
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super(LinearNorm, self).__init__()
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self.linear_layer = torch.nn.Linear(in_dim, out_dim, bias=bias)
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torch.nn.init.xavier_uniform_(
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self.linear_layer.weight,
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gain=torch.nn.init.calculate_gain(w_init_gain))
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def forward(self, x):
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return self.linear_layer(x)
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class ConvNorm(torch.nn.Module):
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def __init__(self, in_channels, out_channels, kernel_size=1, stride=1,
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padding=None, dilation=1, bias=True, w_init_gain='linear'):
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super(ConvNorm, self).__init__()
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if padding is None:
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assert(kernel_size % 2 == 1)
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padding = int(dilation * (kernel_size - 1) / 2)
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self.conv = torch.nn.Conv1d(in_channels, out_channels,
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kernel_size=kernel_size, stride=stride,
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padding=padding, dilation=dilation,
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bias=bias)
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torch.nn.init.xavier_uniform_(
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self.conv.weight, gain=torch.nn.init.calculate_gain(w_init_gain))
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def forward(self, signal):
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conv_signal = self.conv(signal)
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return conv_signal
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class TacotronSTFT(torch.nn.Module):
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def __init__(self, filter_length=1024, hop_length=256, win_length=1024,
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n_mel_channels=80, sampling_rate=22050, mel_fmin=0.0,
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mel_fmax=8000.0):
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super(TacotronSTFT, self).__init__()
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self.n_mel_channels = n_mel_channels
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self.sampling_rate = sampling_rate
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self.stft_fn = STFT(filter_length, hop_length, win_length)
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mel_basis = librosa_mel_fn(
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sampling_rate, filter_length, n_mel_channels, mel_fmin, mel_fmax)
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mel_basis = torch.from_numpy(mel_basis).float()
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self.register_buffer('mel_basis', mel_basis)
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def spectral_normalize(self, magnitudes):
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output = dynamic_range_compression(magnitudes)
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return output
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def spectral_de_normalize(self, magnitudes):
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output = dynamic_range_decompression(magnitudes)
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return output
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def mel_spectrogram(self, y):
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"""Computes mel-spectrograms from a batch of waves
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PARAMS
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------
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y: Variable(torch.FloatTensor) with shape (B, T) in range [-1, 1]
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RETURNS
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-------
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mel_output: torch.FloatTensor of shape (B, n_mel_channels, T)
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"""
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assert(torch.min(y.data) >= -1)
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assert(torch.max(y.data) <= 1)
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magnitudes, phases = self.stft_fn.transform(y)
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magnitudes = magnitudes.data
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mel_output = torch.matmul(self.mel_basis, magnitudes)
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mel_output = self.spectral_normalize(mel_output)
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return mel_output
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