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import sys
import soundcard
import numpy
import pytest
skip_if_not_linux = pytest.mark.skipif(sys.platform != 'linux', reason='Only implemented for PulseAudio so far')
ones = numpy.ones(1024)
signal = numpy.concatenate([[ones], [-ones]]).T
def test_speakers():
for speaker in soundcard.all_speakers():
assert isinstance(speaker.name, str)
assert hasattr(speaker, 'id')
assert isinstance(speaker.channels, int)
assert speaker.channels > 0
def test_microphones():
for microphone in soundcard.all_microphones():
assert isinstance(microphone.name, str)
assert hasattr(microphone, 'id')
assert isinstance(microphone.channels, int)
assert microphone.channels > 0
def test_default_playback():
soundcard.default_speaker().play(signal, 44100, channels=2)
def test_default_record():
recording = soundcard.default_microphone().record(1024, 44100)
assert len(recording == 1024)
def test_default_blockless_record():
recording = soundcard.default_microphone().record(None, 44100)
@skip_if_not_linux
def test_name():
# The default is the application name, so when run from pytest,
# it’s “pytest” or “_jb_pytest_runner.py” or so.
assert 'pytest' in soundcard.get_name()
soundcard.set_name('testapp')
assert soundcard.get_name() == 'testapp'
@skip_if_not_linux
@pytest.mark.parametrize("argv,progname", [
(["./script.py"], "script.py"), # chmod +x script.py; ./script.py
(["path/to/script.py"], "script.py"), # python path/to/script.py or
# python -m path.to.script
(["module/__main__.py"], "module"), # python -m module
(["-m", "module.submodule"], "module.submodule"), # rare unresolved case
(["-c", "import soundcard; soundcard.foo()"], "import soundcard; soundcard.fo..."),
])
def test_infer_name(monkeypatch, argv, progname):
infer = soundcard.pulseaudio._PulseAudio._infer_program_name
monkeypatch.setattr(sys, "argv", argv)
assert infer() == progname
@pytest.fixture
def loopback_speaker():
import sys
if sys.platform == 'win32':
# must install https://www.vb-audio.com/Cable/index.htm
return soundcard.get_speaker('Cable')
elif sys.platform == 'darwin':
# must install soundflower
return soundcard.get_speaker('Soundflower64')
elif sys.platform == 'linux':
# pacmd load-module module-null-sink channels=6 rate=48000
return soundcard.get_speaker('Null')
else:
raise RuntimeError('Unknown platform {}'.format(sys.platform))
@pytest.fixture
def loopback_player(loopback_speaker):
with loopback_speaker.player(48000, channels=2, blocksize=512) as player:
yield player
@pytest.fixture
def loopback_microphone():
if sys.platform == 'win32':
# must install https://www.vb-audio.com/Cable/index.htm
return soundcard.get_microphone('Cable')
elif sys.platform == 'darwin':
# must install soundflower
return soundcard.get_microphone('Soundflower64')
elif sys.platform == 'linux':
return soundcard.get_microphone('Null', include_loopback=True)
else:
raise RuntimeError('Unknown platform {}'.format(sys.platform))
@pytest.fixture
def loopback_recorder(loopback_microphone):
with loopback_microphone.recorder(48000, channels=2, blocksize=512) as recorder:
yield recorder
def test_loopback_playback(loopback_player, loopback_recorder):
loopback_player.play(signal)
recording = loopback_recorder.record(1024*10)
assert recording.shape[1] == 2
left, right = recording.T
assert left.mean() > 0
assert right.mean() < 0
assert (left > 0.5).sum() == len(signal)
assert (right < -0.5).sum() == len(signal)
def test_loopback_reverse_recorder_channelmap(loopback_player, loopback_microphone):
with loopback_microphone.recorder(48000, channels=[1, 0], blocksize=512) as loopback_recorder:
loopback_player.play(signal)
recording = loopback_recorder.record(1024*12)
assert recording.shape[1] == 2
left, right = recording.T
assert right.mean() > 0
assert left.mean() < 0
assert (right > 0.5).sum() == len(signal)
assert (left < -0.5).sum() == len(signal)
def test_loopback_reverse_player_channelmap(loopback_speaker, loopback_recorder):
with loopback_speaker.player(48000, channels=[1, 0], blocksize=512) as loopback_player:
loopback_player.play(signal)
recording = loopback_recorder.record(1024*12)
assert recording.shape[1] == 2
left, right = recording.T
assert right.mean() > 0
assert left.mean() < 0
assert (right > 0.5).sum() == len(signal)
assert (left < -0.5).sum() == len(signal)
def test_loopback_mono_player_channelmap(loopback_speaker, loopback_recorder):
with loopback_speaker.player(48000, channels=[0], blocksize=512) as loopback_player:
loopback_player.play(signal[:,0])
recording = loopback_recorder.record(1024*12)
assert recording.shape[1] == 2
left, right = recording.T
assert left.mean() > 0
if sys.platform == 'linux':
# unmapped channels on linux are filled with the mean of other channels
assert right.mean() < left.mean()
else:
assert abs(right.mean()) < 0.01 # something like zero
assert (left > 0.5).sum() == len(signal)
def test_loopback_mono_recorder_channelmap(loopback_player, loopback_microphone):
with loopback_microphone.recorder(48000, channels=[0], blocksize=512) as loopback_recorder:
loopback_player.play(signal)
recording = loopback_recorder.record(1024*12)
assert len(recording.shape) == 1 or recording.shape[1] == 1
assert recording.mean() > 0
assert (recording > 0.5).sum() == len(signal)
def test_loopback_multichannel_channelmap(loopback_speaker, loopback_microphone):
with loopback_speaker.player(48000, channels=[2, 0], blocksize=512) as loopback_player:
with loopback_microphone.recorder(48000, channels=[2, 0], blocksize=512) as loopback_recorder:
loopback_player.play(signal)
recording = loopback_recorder.record(1024*12)
assert len(recording.shape) == 2
left, right = recording.T
assert left.mean() > 0
assert right.mean() < 0
assert (left > 0.5).sum() == len(signal)
assert (right < -0.5).sum() == len(signal)
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