# Copyright 2016 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import common
import logging
import math
import numpy
import unittest
from autotest_lib.client.cros.audio import audio_data
from autotest_lib.client.cros.audio import audio_quality_measurement
class NoiseLevelTest(unittest.TestCase):
def setUp(self):
"""Uses the same seed to generate noise for each test."""
numpy.random.seed(0)
def testNoiseLevel(self):
# Generates the standard sin wave with standard_noise portion of noise.
rate = 48000
length_in_secs = 2
frequency = 440
amplitude = 1
standard_noise = 0.05
wave = []
for index in xrange(0, rate * length_in_secs):
phase = 2.0 * math.pi * frequency * float(index) / float(rate)
sine_wave = math.sin(phase)
noise = standard_noise * numpy.random.standard_normal()
wave.append(float(amplitude) * (sine_wave + noise))
# Calculates the average value after applying teager operator.
teager_value_of_wave, length = 0, len(wave)
for i in range(1, length-1):
ith_teager_value = abs(wave[i] * wave[i] - wave[i - 1] * wave[i + 1])
ith_teager_value *= max(1, abs(wave[i]))
teager_value_of_wave += ith_teager_value
teager_value_of_wave /= float(length * (amplitude ** 2))
noise = audio_quality_measurement.noise_level(amplitude, frequency,
rate,
teager_value_of_wave)
self.assertTrue(abs(noise - standard_noise) < 0.01)
class ErrorTest(unittest.TestCase):
def testError(self):
value1 = [0.2, 0.4, 0.1, 0.01, 0.01, 0.01]
value2 = [0.3, 0.3, 0.08, 0.0095, 0.0098, 0.0099]
error = [0.5, 0.25, 0.2, 0.05, 0.02, 0.01]
for i in xrange( len(value1) ):
ret = audio_quality_measurement.error(value1[i], value2[i])
self.assertTrue(abs(ret - error[i]) < 0.001)
class QualityMeasurementTest(unittest.TestCase):
def setUp(self):
"""Creates a test signal of sine wave."""
numpy.random.seed(0)
self.rate = 48000
self.freq = 440
self.amplitude = 1
length_in_secs = 2
self.samples = length_in_secs * self.rate
self.y = []
for index in xrange(self.samples):
phase = 2.0 * math.pi * self.freq * float(index) / float(self.rate)
sine_wave = math.sin(phase)
self.y.append(float(self.amplitude) * sine_wave)
def add_noise(self):
"""Adds noise to the test signal."""
noise_amplitude = 0.01 * self.amplitude
for index in xrange(self.samples):
noise = noise_amplitude * numpy.random.standard_normal()
self.y[index] += noise
def generate_delay(self):
"""Generates some delays during playing."""
self.delay_start_time = [0.200, 0.375, 0.513, 0.814, 1.000, 1.300]
self.delay_end_time = [0.201, 0.377, 0.516, 0.824, 1.100, 1.600]
for i in xrange(len(self.delay_start_time)):
start_index = int(self.delay_start_time[i] * self.rate)
end_index = int(self.delay_end_time[i] * self.rate)
for j in xrange(start_index,end_index):
self.y[j] = 0
def generate_artifacts_before_playback(self):
"""Generates artifacts before playing."""
silence_before_playback_end_time = 0.2
end_index = int(silence_before_playback_end_time * self.rate)
for i in xrange(0, end_index):
self.y[i] = 0
noise_start_index = int(0.1 * self.rate)
noise_end_index = int(0.1005 * self.rate)
for i in xrange(noise_start_index, noise_end_index):
self.y[i] = 3 * self.amplitude
def generate_artifacts_after_playback(self):
"""Generates artifacts after playing."""
silence_after_playback_start_time = int(1.9 * self.rate)
noise_start_index = int(1.95 * self.rate)
noise_end_index = int((1.95 + 0.02) * self.rate)
for i in xrange(silence_after_playback_start_time, self.samples):
self.y[i] = 0
for i in xrange(noise_start_index, noise_end_index):
self.y[i] = self.amplitude
def generate_burst_during_playback(self):
"""Generates bursts during playing."""
self.burst_start_time = [0.300, 0.475, 0.613, 0.814, 1.300]
self.burst_end_time = [0.301, 0.476, 0.614, 0.815, 1.301]
for i in xrange(len(self.burst_start_time)):
start_index = int(self.burst_start_time[i] * self.rate)
end_index = int(self.burst_end_time[i] * self.rate)
for j in xrange(start_index, end_index):
self.y[j] = self.amplitude * (3 + numpy.random.uniform(-1, 1))
def generate_volume_changing(self):
"Generates volume changing during playing."
start_time = [0.300, 1.400]
end_time = [0.600, 1.700]
for i in xrange(len(start_time)):
start_index = int(start_time[i] * self.rate)
end_index = int(end_time[i] * self.rate)
for j in xrange(start_index,end_index):
self.y[j] *= 1.4
self.volume_changing = [+1, -1, +1, -1]
self.volume_changing_time = [0.3, 0.6, 1.4, 1.7]
def testGoodSignal(self):
"""Sine wave signal with no noise or artifacts."""
result = audio_quality_measurement.quality_measurement(self.y,
self.rate)
self.assertTrue(len(result['artifacts']['noise_before_playback']) == 0)
self.assertTrue(len(result['artifacts']['noise_after_playback']) == 0)
self.assertTrue(len(result['artifacts']['delay_during_playback']) == 0)
self.assertTrue(len(result['artifacts']['burst_during_playback']) == 0)
self.assertTrue(len(result['volume_changes']) == 0)
self.assertTrue(result['equivalent_noise_level'] < 0.005)
def testGoodSignalNoise(self):
"""Sine wave signal with noise."""
self.add_noise();
result = audio_quality_measurement.quality_measurement(self.y,
self.rate)
self.assertTrue(len(result['artifacts']['noise_before_playback']) == 0)
self.assertTrue(len(result['artifacts']['noise_after_playback']) == 0)
self.assertTrue(len(result['artifacts']['delay_during_playback']) == 0)
self.assertTrue(len(result['artifacts']['burst_during_playback']) == 0)
self.assertTrue(len(result['volume_changes']) == 0)
self.assertTrue(0.009 < result['equivalent_noise_level'] and
result['equivalent_noise_level'] < 0.011)
def testDelay(self):
"""Sine wave with delay during playing."""
self.generate_delay()
result = audio_quality_measurement.quality_measurement(self.y,
self.rate)
self.assertTrue(len(result['artifacts']['noise_before_playback']) == 0)
self.assertTrue(len(result['artifacts']['noise_after_playback']) == 0)
self.assertTrue(len(result['volume_changes']) ==
2 * len(self.delay_start_time))
self.assertTrue(result['equivalent_noise_level'] < 0.005)
self.assertTrue(len(result['artifacts']['delay_during_playback']) ==
len(self.delay_start_time))
for i in xrange(len(result['artifacts']['delay_during_playback'])):
delta = abs(result['artifacts']['delay_during_playback'][i][0] -
self.delay_start_time[i])
self.assertTrue(delta < 0.001)
duration = self.delay_end_time[i] - self.delay_start_time[i]
delta = abs(result['artifacts']['delay_during_playback'][i][1] -
duration)
self.assertTrue(delta < 0.001)
def testArtifactsBeforePlayback(self):
"""Sine wave with artifacts before playback."""
self.generate_artifacts_before_playback()
result = audio_quality_measurement.quality_measurement(self.y,
self.rate)
self.assertTrue(len(result['artifacts']['noise_before_playback']) == 1)
delta = abs(result['artifacts']['noise_before_playback'][0][0] - 0.1)
self.assertTrue(delta < 0.01)
delta = abs(result['artifacts']['noise_before_playback'][0][1] - 0.005)
self.assertTrue(delta < 0.004)
self.assertTrue(len(result['artifacts']['noise_after_playback']) == 0)
self.assertTrue(len(result['artifacts']['delay_during_playback']) == 0)
self.assertTrue(len(result['artifacts']['burst_during_playback']) == 0)
self.assertTrue(len(result['volume_changes']) == 0)
self.assertTrue(result['equivalent_noise_level'] < 0.005)
def testArtifactsAfterPlayback(self):
"""Sine wave with artifacts after playback."""
self.generate_artifacts_after_playback()
result = audio_quality_measurement.quality_measurement(self.y,
self.rate)
self.assertTrue(len(result['artifacts']['noise_before_playback']) == 0)
self.assertTrue(len(result['artifacts']['noise_after_playback']) == 1)
delta = abs(result['artifacts']['noise_after_playback'][0][0] - 1.95)
self.assertTrue(delta < 0.01)
delta = abs(result['artifacts']['noise_after_playback'][0][1] - 0.02)
self.assertTrue(delta < 0.001)
self.assertTrue(len(result['artifacts']['delay_during_playback']) == 0)
self.assertTrue(len(result['artifacts']['burst_during_playback'] ) == 0)
self.assertTrue(len(result['volume_changes']) == 0)
self.assertTrue(result['equivalent_noise_level'] < 0.005)
def testBurstDuringPlayback(self):
"""Sine wave with burst during playback."""
self.generate_burst_during_playback()
result = audio_quality_measurement.quality_measurement(self.y,
self.rate)
self.assertTrue(len(result['artifacts']['noise_before_playback']) == 0)
self.assertTrue(len(result['artifacts']['noise_after_playback']) == 0)
self.assertTrue(len(result['artifacts']['delay_during_playback']) == 0)
self.assertTrue(len(result['artifacts']['burst_during_playback']) == 5)
self.assertTrue(len(result['volume_changes']) == 10)
self.assertTrue(result['equivalent_noise_level'] > 0.02)
for i in xrange(len(result['artifacts']['burst_during_playback'])):
delta = abs(self.burst_start_time[i] -
result['artifacts']['burst_during_playback'][i])
self.assertTrue(delta < 0.002)
def testVolumeChanging(self):
"""Sine wave with volume changing during playback."""
self.generate_volume_changing()
result = audio_quality_measurement.quality_measurement(self.y,
self.rate)
self.assertTrue(len(result['artifacts']['noise_before_playback']) == 0)
self.assertTrue(len(result['artifacts']['noise_after_playback']) == 0)
self.assertTrue(len(result['artifacts']['delay_during_playback']) == 0)
self.assertTrue(len(result['artifacts']['burst_during_playback']) == 0)
self.assertTrue(result['equivalent_noise_level'] < 0.005)
self.assertTrue(len(result['volume_changes']) ==
len(self.volume_changing))
for i in xrange(len(self.volume_changing)):
self.assertTrue(abs(self.volume_changing_time[i] -
result['volume_changes'][i][0]) < 0.01)
self.assertTrue(self.volume_changing[i] ==
result['volume_changes'][i][1])
if __name__ == '__main__':
unittest.main()