imgconnector.py 文件源码

def write_song(piano_roll, filename):
        """ Save the song on disk
        Args:
            piano_roll (np.array): a song object containing the tracks and melody
            filename (str): the path were to save the song (don't add the file extension)
        """
        note_played = piano_roll > 0.5
        piano_roll_int = np.uint8(piano_roll*255)

        b = piano_roll_int * (~note_played).astype(np.uint8)  # Note silenced
        g = np.zeros(piano_roll_int.shape, dtype=np.uint8)    # Empty channel
        r = piano_roll_int * note_played.astype(np.uint8)     # Notes played

        img = cv.merge((b, g, r))

        # TODO: We could insert a first column indicating the piano keys (black/white key)

        cv.imwrite(filename + '.png', img)