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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def libvlc_video_get_aspect_ratio(p_mi):
    '''Get current video aspect ratio.
    @param p_mi: the media player.
    @return: the video aspect ratio or NULL if unspecified (the result must be released with free() or L{libvlc_free}()).
    '''
    f = _Cfunctions.get('libvlc_video_get_aspect_ratio', None) or \
        _Cfunction('libvlc_video_get_aspect_ratio', ((1,),), string_result,
                    ctypes.c_void_p, MediaPlayer)
    return f(p_mi)