def _available_audioread_backends():
"""
Reduces the overhead of ``audioread.audio_open()`` when called repeatedly
by caching the results of scanning for FFMPEG etc.
"""
import audioread
backends = audioread.available_backends()
logging.info(f'Using audioread. Available backends: {backends}')
return backends
def test_audio_mixed_with_offset_and_snr(self):
mixer = AudioMixer(base_audio=self.audio1, sampling_rate=8000)
mixer.add_to_mix(self.audio2, snr=10, offset=0.5)
unmixed = mixer.unmixed_audio
assert unmixed.shape == (2, 12000) # offset 0.5s == 4000 samples
assert (unmixed[0, :8000] == 1).all()
assert (unmixed[0, 8000:] == 0).all()
assert (unmixed[1, :4000] == 0).all()
np.testing.assert_almost_equal(unmixed[1, 4000:], 0.31622776)
assert unmixed.dtype == np.float32
mixed = mixer.mixed_audio
assert mixed.shape == (1, 12000)
assert (mixed[0, :4000] == 1).all()
np.testing.assert_almost_equal(mixed[0, 4000:8000], 1.31622776)
np.testing.assert_almost_equal(mixed[0, 8000:], 0.31622776)
assert mixed.dtype == np.float32
@pytest.mark.skipif(
all('ffmpeg' not in str(backend).lower() for backend in audioread.available_backends()),
reason='Requires FFmpeg to be installed.'
)
def test_recording_from_file_using_audioread():
path = 'test/fixtures/mono_c0.opus'
recording = Recording.from_file(path)
recording.load_audio()
# OPUS file read succesfully!
assert (unmixed[0, 8000:] == 0).all()
assert (unmixed[1, :4000] == 0).all()
np.testing.assert_almost_equal(unmixed[1, 4000:], 0.31622776)
assert unmixed.dtype == np.float32
mixed = mixer.mixed_audio
assert mixed.shape == (1, 12000)
assert (mixed[0, :4000] == 1).all()
np.testing.assert_almost_equal(mixed[0, 4000:8000], 1.31622776)
np.testing.assert_almost_equal(mixed[0, 8000:], 0.31622776)
assert mixed.dtype == np.float32
@pytest.mark.skipif(
all("ffmpeg" not in str(backend).lower()
for backend in audioread.available_backends()),
reason="Requires FFmpeg to be installed.",
)
def test_opus_recording_from_file():
path = "test/fixtures/mono_c0.opus"
recording = Recording.from_file(path)
# OPUS always overrides the sampling rate to 48000
assert recording.sampling_rate == 48000
# OPUS may crate extra audio frames / samples...
assert isclose(recording.duration, 0.5054166666666666)
samples = recording.load_audio()
num_channels, num_samples = samples.shape
assert num_channels == recording.num_channels
assert num_samples == recording.num_samples
assert num_samples == 24260
# OPUS file read succesfully!
"""
Wrapping opening function of audioread library.
This is used to cache the available backends.
If backend evaluation is done on every call it is very inefficient.
"""
import audioread
available_backends = audioread.available_backends()
def audio_open(path):
return audioread.audio_open(path, backends=available_backends)