Convenience wrapper around waveform_to_examples() for a common WAV format.

  Args:
    wav_file: String path to a file, or a file-like object. The file
    is assumed to contain WAV audio data with signed 16-bit PCM samples.

  Returns:
    See waveform_to_examples.

def wavfile_to_examples(wav_file):
  """Convenience wrapper around waveform_to_examples() for a common WAV format.

  Args:
    wav_file: String path to a file, or a file-like object. The file
    is assumed to contain WAV audio data with signed 16-bit PCM samples.

  Returns:
    See waveform_to_examples.
  """
  from scipy.io import wavfile
  sr, wav_data = wavfile.read(wav_file)
  assert wav_data.dtype == np.int16, 'Bad sample type: %r' % wav_data.dtype
  samples = wav_data / 32768.0  # Convert to [-1.0, +1.0]
  return waveform_to_examples(samples, sr)