sample.py 文件源码

def stereo(self, left_factor=1.0, right_factor=1.0):
        """
        Turn a mono sample into a stereo one with given factors/amplitudes for left and right channels.
        Note that it is a fast but simplistic conversion; the waveform in both channels is identical
        so you may suffer from phase cancellation when playing the resulting stereo sample.
        If the sample is already stereo, the left/right channel separation is changed instead.
        """
        assert not self.__locked
        if self.__nchannels == 2:
            # first split the left and right channels and then remix them
            right = self.copy().right()
            self.left().amplify(left_factor)
            return self.stereo_mix(right, 'R', right_factor)
        if self.__nchannels == 1:
            self.__frames = audioop.tostereo(self.__frames, self.__samplewidth, left_factor, right_factor)
            self.__nchannels = 2
            return self
        raise ValueError("sample must be mono or stereo already")