def test_synth(self):
si_in, ei_in = torchaudio.info(self.test_filepath)
len_in_seconds = si_in.length / si_in.channels / si_in.rate
ei_in.encoding = torchaudio.get_sox_encoding_t(1)
E = torchaudio.sox_effects.SoxEffectsChain(out_encinfo=ei_in, out_siginfo=si_in)
E.set_input_file(self.test_filepath)
E.append_effect_to_chain("synth", [str(len_in_seconds), "pinknoise", "mix"])
E.append_effect_to_chain("rate", [44100])
E.append_effect_to_chain("channels", [2])
x, sr = E.sox_build_flow_effects()
self.assertEqual(x.size(0), si_in.channels)
self.assertEqual(si_in.length, x.size(0) * x.size(1))
def test_band_chorus(self):
si_in, ei_in = torchaudio.info(self.test_filepath)
ei_in.encoding = torchaudio.get_sox_encoding_t(1)
E = torchaudio.sox_effects.SoxEffectsChain(out_encinfo=ei_in, out_siginfo=si_in)
E.set_input_file(self.test_filepath)
E.append_effect_to_chain("band", ["-n", "10k", "3.5k"])
E.append_effect_to_chain("chorus", [.5, .7, 55, 0.4, .25, 2, '-s'])
E.append_effect_to_chain("rate", [si_in.rate])
E.append_effect_to_chain("channels", [si_in.channels])
x, sr = E.sox_build_flow_effects()
# The chorus effect will make the output file longer than the input
self.assertEqual(x.size(0), si_in.channels)
self.assertGreaterEqual(x.size(1) * x.size(0), si_in.length)
def test_ulaw_and_siginfo(self):
si_out = torchaudio.sox_signalinfo_t()
ei_out = torchaudio.sox_encodinginfo_t()
si_out.precision = 8
ei_out.encoding = torchaudio.get_sox_encoding_t(9)
ei_out.bits_per_sample = 8
si_in, ei_in = torchaudio.info(self.test_filepath)
si_out.rate = 44100
si_out.channels = 2
E = torchaudio.sox_effects.SoxEffectsChain(out_siginfo=si_out, out_encinfo=ei_out)
E.set_input_file(self.test_filepath)
x, sr = E.sox_build_flow_effects()
# Note: the output was encoded into ulaw because the
# number of unique values in the output is less than 256.
self.assertLess(x.unique().size(0), 2**8 + 1)
self.assertEqual(x.numel(), si_in.length)
