recognition.py 文件源码

def _convert_file(self, src, dest=None):
        """
        convert wav into 8khz rate
        """
        def convert(read,write):
            write.setparams((1, 2, 8000, 0,'NONE', 'not compressed'))

            o_fr = read.getframerate()
            o_chnl = read.getnchannels()
            t_fr = read.getnframes()
            data = read.readframes(t_fr)
            cnvrt = audioop.ratecv(data, 2, o_chnl,
                                   o_fr, 8000, None)
            if o_chnl != 1:
                mono = audioop.tomono(cnvrt[0], 2, 1, 0)
                write.writeframes(mono)
            else:
                write.writeframes(cnvrt[0])
            read.close()
            write.close()

        if dest is None:
            temp = src + '.temp'
            os.rename(src, temp)
            read = wave.open(temp, 'r')
            write = wave.open(src, 'w')
            convert(read, write)
            os.remove(temp)
        else:
            read = wave.open(src, 'r')
            write = wave.open(dest, 'w')
            convert(read, write)