pyebur128/tests/test_loudness_momentary.py

82 lines
2.9 KiB
Python

import pytest
from pyebur128 import (
ChannelType, MeasurementMode, R128State, get_loudness_momentary
)
import soundfile as sf
def get_max_loudness_momentary(filename):
'''Open the WAV file and get the loudness in momentary (400ms) chunks.'''
with sf.SoundFile(filename) as wav:
state = R128State(wav.channels,
wav.samplerate,
MeasurementMode.MODE_M)
if wav.channels == 5:
state.set_channel(0, ChannelType.LEFT)
state.set_channel(1, ChannelType.RIGHT)
state.set_channel(2, ChannelType.CENTER)
state.set_channel(3, ChannelType.LEFT_SURROUND)
state.set_channel(4, ChannelType.RIGHT_SURROUND)
# 10 ms buffer / 100 Hz refresh rate as 10 Hz refresh rate fails on
# several tests.
max_momentary = float('-inf')
total_frames_read = 0
for block in wav.blocks(blocksize=int(wav.samplerate / 100)):
frames_read = len(block)
total_frames_read += frames_read
for sample in block:
state.add_frames(sample, 1)
# Invalid results before the first 400 ms.
if total_frames_read >= 4 * wav.samplerate / 10:
momentary = get_loudness_momentary(state)
max_momentary = max(momentary, max_momentary)
del state
return max_momentary
def test_max_loudness_momentary(r128_test_data):
'''Test for the loudness value of a single file in momentary (400ms)
chunks.
'''
expected = [
('seq-3341-13-1-24bit.wav', -23.0),
('seq-3341-13-2-24bit.wav', -23.0),
('seq-3341-13-3-24bit.wav.wav', -23.0),
('seq-3341-13-4-24bit.wav.wav', -23.0),
('seq-3341-13-5-24bit.wav.wav', -23.0),
('seq-3341-13-6-24bit.wav.wav', -23.0),
('seq-3341-13-7-24bit.wav.wav', -23.0),
('seq-3341-13-8-24bit.wav.wav', -23.0),
('seq-3341-13-9-24bit.wav.wav', -23.0),
('seq-3341-13-10-24bit.wav.wav', -23.0),
('seq-3341-13-11-24bit.wav.wav', -23.0),
('seq-3341-13-12-24bit.wav.wav', -23.0),
('seq-3341-13-13-24bit.wav.wav', -23.0),
('seq-3341-13-14-24bit.wav.wav', -23.0),
('seq-3341-13-15-24bit.wav.wav', -23.0),
('seq-3341-13-16-24bit.wav.wav', -23.0),
('seq-3341-13-17-24bit.wav.wav', -23.0),
('seq-3341-13-18-24bit.wav.wav', -23.0),
('seq-3341-13-19-24bit.wav.wav', -23.0),
('seq-3341-13-20-24bit.wav.wav', -23.0),
]
tolerance = 0.1
status_msg = '==== \'{}\': want {} \u00b1 {} ---> '
print('\n')
for test in expected:
print(status_msg.format(test[0], test[1], tolerance), end='')
result = get_max_loudness_momentary(r128_test_data / test[0])
print('got {} '.format(round(result, 1)), end='')
assert (round(result, 1) <= test[1] + tolerance and
round(result, 1) >= test[1] - tolerance)
print('---> PASSED!')