def write(filepath, signal, samplerate=44100, bytedepth=2):
"""Write an audio signal to disk.
Parameters
----------
filepath: str
Path to an audio file.
signal : np.ndarray, ndim in [1,2]
Audio signal to write to disk.
samplerate: scalar, or None for file's default
Samplerate for the returned audio signal.
bytedepth : int, default=2
Number of bytes for the audio signal; must be 2.
"""
if bytedepth != 2:
raise NotImplementedError("Currently only 16-bit audio is supported.")
tmp_file = util.temp_file(formats.WAVE)
if formats.WAVE == os.path.splitext(filepath)[-1].strip('.'):
tmp_file = filepath
signal = np.asarray(signal)
signal = signal.reshape(-1, 1) if signal.ndim == 1 else signal
fp = wave.open(tmp_file, 'w')
fp.setnchannels(signal.shape[-1])
fp.setsampwidth(bytedepth)
fp.setframerate(samplerate)
fp.writeframes(util.array_to_byte_string(signal, bytedepth))
fp.close()
if tmp_file != filepath:
sox.convert(tmp_file, filepath)
def test_array_to_byte_string_stereo_bytedepthE4(self):
self.assertEqual(util.array_to_byte_string(self.stereo, 4),
self.stereo_str4)
def test_array_to_byte_string_mono_bytedepthE2(self):
self.assertEqual(util.array_to_byte_string(self.mono, 2),
self.mono_str2)