72 lines
2.7 KiB
Python
72 lines
2.7 KiB
Python
import sys
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from pathlib import Path
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import pickle
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from abc import ABC
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from torch.utils.data import Dataset
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from torchvision.transforms import Compose
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from ml_lib.audio_toolset.audio_io import LibrosaAudioToMel, MelToImage
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from ml_lib.audio_toolset.mel_dataset import TorchMelDataset
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import librosa
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class LibrosaAudioToMelDataset(Dataset):
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@property
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def audio_file_duration(self):
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return librosa.get_duration(sr=self.mel_kwargs.get('sr', None), filename=self.audio_path)
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@property
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def sampling_rate(self):
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return self.mel_kwargs.get('sr', None)
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def __init__(self, audio_file_path, label, sample_segment_len=0, sample_hop_len=0, reset=False,
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audio_augmentations=None, mel_augmentations=None, mel_kwargs=None, **kwargs):
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super(LibrosaAudioToMelDataset, self).__init__()
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# audio_file, sampling_rate = librosa.load(self.audio_path, sr=sampling_rate)
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mel_kwargs.update(sr=mel_kwargs.get('sr', None) or librosa.get_samplerate(audio_file_path))
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self.mel_kwargs = mel_kwargs
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self.reset = reset
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self.audio_path = Path(audio_file_path)
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mel_folder_suffix = self.audio_path.parent.parent.name
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self.mel_file_path = Path(str(self.audio_path)
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.replace(mel_folder_suffix, f'{mel_folder_suffix}_mel_folder')
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.replace(self.audio_path.suffix, '.npy'))
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self.audio_augmentations = audio_augmentations
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self.dataset = TorchMelDataset(self.mel_file_path, sample_segment_len, sample_hop_len, label,
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self.audio_file_duration, mel_kwargs['sr'], mel_kwargs['hop_length'],
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mel_kwargs['n_mels'], transform=mel_augmentations)
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self._mel_transform = Compose([LibrosaAudioToMel(**mel_kwargs),
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MelToImage()
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])
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def __getitem__(self, item):
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return self.dataset[item]
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def __len__(self):
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return len(self.dataset)
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def build_mel(self):
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if self.reset:
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self.mel_file_path.unlink(missing_ok=True)
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if not self.mel_file_path.exists():
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self.mel_file_path.parent.mkdir(parents=True, exist_ok=True)
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with self.audio_path.open(mode='rb') as audio_file:
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raw_sample, _ = librosa.core.load(audio_file, sr=self.sampling_rate)
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mel_sample = self._mel_transform(raw_sample)
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with self.mel_file_path.open('wb') as mel_file:
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pickle.dump(mel_sample, mel_file, protocol=pickle.HIGHEST_PROTOCOL)
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else:
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pass
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return self.mel_file_path.exists()
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