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- import os
- import pickle
- from glob import iglob
- import numpy as np
- import librosa
- DATA_AUDIO_DIR = './audio'
- TARGET_SR = 8000
- OUTPUT_DIR = './output'
- OUTPUT_DIR_TRAIN = os.path.join(OUTPUT_DIR, 'train')
- OUTPUT_DIR_TEST = os.path.join(OUTPUT_DIR, 'test')
- AUDIO_LENGTH = 10000
- class_ids = {
- 'normal': 0,
- 'murmur': 1,
- 'extrahls': 2,
- 'artifact': 3,
- 'unlabelled': 4,
- }
- def extract_class_id(wav_filename):
- if 'normal' in wav_filename:
- return class_ids.get('normal')
- elif 'murmur' in wav_filename:
- return class_ids.get('murmur')
- elif 'extrahls' in wav_filename:
- return class_ids.get('extrahls')
- elif 'artifact' in wav_filename:
- return class_ids.get('artifact')
- elif 'unlabelled' in wav_filename:
- return class_ids.get('unlabelled')
- else:
- return class_ids.get('unlabelled')
- def read_audio_from_filename(filename, target_sr):
- audio, _ = librosa.load(filename, sr=target_sr, mono=True)
- audio = audio.reshape(-1, 1)
- return audio
- def convert_data():
- for i, wav_filename in enumerate(iglob(os.path.join(DATA_AUDIO_DIR, '**/**.wav'), recursive=True)):
- class_id = extract_class_id(wav_filename)
- audio_buf = read_audio_from_filename(wav_filename, target_sr=TARGET_SR)
- # normalize mean 0, variance 1
- audio_buf = (audio_buf - np.mean(audio_buf)) / np.std(audio_buf)
- original_length = len(audio_buf)
- print(i, wav_filename, original_length, np.round(np.mean(audio_buf), 4), np.std(audio_buf))
- if original_length < AUDIO_LENGTH:
- audio_buf = np.concatenate((audio_buf, np.zeros(shape=(AUDIO_LENGTH - original_length, 1))))
- print('PAD New length =', len(audio_buf))
- elif original_length > AUDIO_LENGTH:
- audio_buf = audio_buf[0:AUDIO_LENGTH]
- print('CUT New length =', len(audio_buf))
- output_folder = OUTPUT_DIR_TRAIN
- if i // 50 == 0:
- output_folder = OUTPUT_DIR_TEST
- output_filename = os.path.join(output_folder, str(i) + '.pkl')
- out = {'class_id': class_id,
- 'audio': audio_buf,
- 'sr': TARGET_SR}
- with open(output_filename, 'wb') as w:
- pickle.dump(out, w)
- if __name__ == '__main__':
- convert_data()
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