audio_io_test.py 文件源码

def testWavDataToSamples(self):
    w = wave.open(self.wav_filename, 'rb')
    w_mono = wave.open(self.wav_filename_mono, 'rb')

    # Check content size.
    y = audio_io.wav_data_to_samples(self.wav_data, sample_rate=16000)
    y_mono = audio_io.wav_data_to_samples(self.wav_data_mono, sample_rate=22050)
    self.assertEquals(
        round(16000.0 * w.getnframes() / w.getframerate()), y.shape[0])
    self.assertEquals(
        round(22050.0 * w_mono.getnframes() / w_mono.getframerate()),
        y_mono.shape[0])

    # Check a few obvious failure modes.
    self.assertLess(0.01, y.std())
    self.assertLess(0.01, y_mono.std())
    self.assertGreater(-0.1, y.min())
    self.assertGreater(-0.1, y_mono.min())
    self.assertLess(0.1, y.max())
    self.assertLess(0.1, y_mono.max())