sample.py 文件源码

def speed(self, speed):
        """
        Changes the playback speed of the sample, without changing the sample rate.
        This will change the pitch and duration of the sound accordingly.
        The algorithm used is simple, and it will cause a loss of sound quality.
        """
        assert not self.__locked
        assert speed > 0
        if speed == 1.0:
            return self
        rate = self.samplerate
        self.__frames = audioop.ratecv(self.__frames, self.samplewidth, self.nchannels, int(self.samplerate*speed), rate, None)[0]
        self.__samplerate = rate
        return self