How to use the audiofile.read function in audiofile

Returns:
        tuple:

            * **numpy.ndarray**: two-dimensional array with shape
              `(channels, samples)`
            * **int**: sample rate of the audio file

    Example:
        >>> signal, sampling_rate = load('speech.wav')

    """
    signal = np.array([[]])  # empty signal of shape (1, 0)
    sampling_rate = None
    try:
        signal, sampling_rate = af.read(filename,
                                        duration=duration,
                                        offset=offset,
                                        always_2d=True)
    except ValueError:
        warn('File opening error for: {}'.format(filename), UserWarning)
    except (IOError, FileNotFoundError):
        warn('File does not exist: {}'.format(filename), UserWarning)
    except RuntimeError:
        warn('Runtime error for file: {}'.format(filename), UserWarning)
    except subprocess.CalledProcessError:
        warn('ffmpeg conversion failed for: {}'.format(filename), UserWarning)
    return signal, sampling_rate