python中pyaudio循环播放时为什么会发生下溢？

import pyaudio
import wave
import time

def uptime(x):
    x=time.perf_counter()
    return x

#问题出现在这一部分
def main():
    CHUNK = 1024
    FILENAME = '1.wav'

    wf = wave.open('1.wav', 'rb')
    p = pyaudio.PyAudio()
    stream = p.open(format=p.get_format_from_width(wf.getsampwidth()),\
                channels=wf.getnchannels(),rate=wf.getframerate(),output=True)
    data = wf.readframes(CHUNK)


    while data != '':
        stream.write(data)
        data = wf.readframes(CHUNK)

    stream = p.open(format=pyaudio.paInt16, channels=chan, rate=rate,
                input=True, stream_callback=callback)
    stream.stop_stream()
    stream.close()
    p.terminate()
    return 

i=0
while i<4:
    t=time.perf_counter()
    x=t
    while uptime(x)<t+3:
        x=time.perf_counter()
    i=i+1
    print(i)
    main()

系统报错：
Traceback (most recent call last):
File "D:\python文件\自\计时器.py", line 41, in
main()
File "D:\python文件\自\计时器.py", line 21, in main
stream.write(data)
File "C:\Users\xlw\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pyaudio.py", line 586, in write
exception_on_underflow)
KeyboardInterrupt

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