81 lines
2.8 KiB
Python
81 lines
2.8 KiB
Python
import pytest
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from pyebur128 import (
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ChannelType, MeasurementMode, R128State, get_loudness_shortterm
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)
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import soundfile as sf
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def get_max_loudness_shortterm(filename):
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'''Open the WAV file and get the loudness in short-term (3s) chunks.'''
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with sf.SoundFile(filename) as wav:
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state = R128State(wav.channels,
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wav.samplerate,
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MeasurementMode.MODE_S)
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if wav.channels == 5:
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state.set_channel(0, ChannelType.LEFT)
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state.set_channel(1, ChannelType.RIGHT)
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state.set_channel(2, ChannelType.CENTER)
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state.set_channel(3, ChannelType.LEFT_SURROUND)
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state.set_channel(4, ChannelType.RIGHT_SURROUND)
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# 10 ms buffer / 10 Hz refresh rate.
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max_shortterm = float('-inf')
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total_frames_read = 0
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for block in wav.blocks(blocksize=int(wav.samplerate / 10)):
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frames_read = len(block)
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total_frames_read += frames_read
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for sample in block:
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state.add_frames(sample, 1)
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# Invalid results before the first 3 seconds.
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if total_frames_read >= 3 * wav.samplerate:
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shortterm = get_loudness_shortterm(state)
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max_shortterm = max(shortterm, max_shortterm)
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del state
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return max_shortterm
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def test_max_loudness_shortterm(r128_test_data):
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'''Test for the loudness value of a single file in short-term (3s)
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chunks.
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'''
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expected = [
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('seq-3341-10-1-24bit.wav', -23.0),
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('seq-3341-10-2-24bit.wav', -23.0),
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('seq-3341-10-3-24bit.wav', -23.0),
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('seq-3341-10-4-24bit.wav', -23.0),
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('seq-3341-10-5-24bit.wav', -23.0),
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('seq-3341-10-6-24bit.wav', -23.0),
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('seq-3341-10-7-24bit.wav', -23.0),
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('seq-3341-10-8-24bit.wav', -23.0),
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('seq-3341-10-9-24bit.wav', -23.0),
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('seq-3341-10-10-24bit.wav', -23.0),
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('seq-3341-10-11-24bit.wav', -23.0),
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('seq-3341-10-12-24bit.wav', -23.0),
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('seq-3341-10-13-24bit.wav', -23.0),
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('seq-3341-10-14-24bit.wav', -23.0),
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('seq-3341-10-15-24bit.wav', -23.0),
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('seq-3341-10-16-24bit.wav', -23.0),
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('seq-3341-10-17-24bit.wav', -23.0),
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('seq-3341-10-18-24bit.wav', -23.0),
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('seq-3341-10-19-24bit.wav', -23.0),
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('seq-3341-10-20-24bit.wav', -23.0),
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]
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tolerance = 0.1
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status_msg = '==== \'{}\': want {} \u00b1 {} ---> '
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print('\n')
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for test in expected:
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print(status_msg.format(test[0], test[1], tolerance), end='')
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result = get_max_loudness_shortterm(r128_test_data / test[0])
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print('got {} '.format(round(result, 1)), end='')
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assert (round(result, 1) <= test[1] + tolerance and
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round(result, 1) >= test[1] - tolerance)
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print('---> PASSED!')
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