使用python子进程和线程播放声音

问题描述

我正在尝试打开警报，然后循环播放声音，直到警报关闭.然后声音应该停止了.

I am trying to open an alert, then loop a sound until the alert is closed. Then the sound should stop.

我尝试过:

import threading
import time
import subprocess


stop_sound = False
def play_alarm(file_name = "beep.wav"):
    """Repeat the sound specified to mimic an alarm."""
    while not stop_sound:
        process = subprocess.Popen(["afplay", file_name], shell=False)
        while not stop_sound:
            if process.poll():
                break
            time.sleep(0.1)
        if stop_sound:
            process.kill()

def alert_after_timeout(timeout, message):
    """After timeout seconds, show an alert and play the alarm sound."""
    global stop_sound
    time.sleep(timeout)
    process = None
    thread = threading.Thread(target=play_alarm)
    thread.start()
    # show_alert is synchronous, it blocks until alert is closed
    show_alert(message)

    stop_sound = True
    thread.join()

但是由于某种原因，声音甚至无法播放.

But for some reason the sound doesn't even play.

推荐答案

这是因为process.poll()在处理完成后返回0，这是一个虚假的值.

It's because process.poll() returns 0 after the process finishes, which is a falsy value.

快速修复:

while not stop_sound:
    if process.poll() is not None:
        break

这篇关于使用python子进程和线程播放声音的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！