loudness_features.py

'''
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This will featurize folders of audio files if the default_audio_features = ['loudness_features']

Extracts loudness features.

For more information, check out PyLoudNorm documentation: https://github.com/csteinmetz1/pyloudnorm
'''
import soundfile as sf
import os
try:
	import pyloudnorm as pyln
except:
	os.system('pip3 install pyloudnorm==0.1.0')
	import pyloudnorm as pyln

def loudness_featurize(audiofile):
	'''
	from the docs 
	https://github.com/danilobellini/audiolazy/blob/master/examples/formants.py
	'''
	data, rate = sf.read(audiofile) # load audio (with shape (samples, channels))
	meter = pyln.Meter(rate) # create BS.1770 meter
	loudness = meter.integrated_loudness(data) # measure loudness

	# units in dB
	features=[loudness]
	labels=['Loudness']
	
	print(dict(zip(labels,features)))
	return features, labels