audioanalyzer.py 文件源码

def compute_melodic_progression(self, pitch):
        tic = timeit.default_timer()
        self.vprint(u"- Computing the melodic progression model of {0:s}"
                    .format(pitch['source']))

        if self._mel_prog_params['frame_dur'] is None:
            # compute number of frames from some simple "rule of thumb"
            duration = pitch['pitch'][-1][0]
            frame_dur = duration / self._mel_prog_params['min_num_frames']
            frame_dur = int(5 * round(float(frame_dur) / 5))  # round to 5sec

            # force to be between 5 and max_frame_dur
            if frame_dur < 5:
                frame_dur = 5
            elif frame_dur > self._mel_prog_params['max_frame_dur']:
                frame_dur = self._mel_prog_params['max_frame_dur']
        else:
            frame_dur = self._mel_prog_params['frame_dur']

        melodic_progression = self._melodic_progression_analyzer.analyze(
            pitch['pitch'], frame_dur=frame_dur,
            hop_ratio=self._mel_prog_params['hop_ratio'])
        self.vprint_time(tic, timeit.default_timer())

        return melodic_progression