def render_sounds(samples, indices, sound_samples):
"""Adds sound to samples at the given starting indices."""
result = np.zeros(samples.shape[0])
for onset in indices:
# Crop the sound if necessary.
if onset + sound_samples.shape[0] > samples.shape[0]:
sound_samples = sound_samples[:samples.shape[0] - onset]
# Create samples for this sound at the appropriate offset.
result[onset:onset + sound_samples.shape[0]] += sound_samples
# Normalize the amplitude of the resulting track.
max_amplitude = np.max(result)
if max_amplitude > 0:
result /= max_amplitude
# Merge the samples with the provided input track.
sound.merge_audio(samples, result)
def test_merge_audio(self):
#This merge should succeed, and do nothing
note1 = sound.generate_note(1, 1, 440)
note2 = numpy.zeros(len(note1))
sound.merge_audio(note2, note1)
assert (note2 == note1).all()
#This merge should succeed, and do something
note3 = sound.generate_note(1, 1, 100)
old_note_3 = deepcopy(note3)
sound.merge_audio(note3, note1)
assert (note3 != old_note_3).all()
#This merge should fail and do nothing
note4 = sound.generate_note(0.5, 1, 220)
old_note_4 = deepcopy(note4)
sound.merge_audio(note4, note1)
assert (note4 == old_note_4).all()
