如何在播放媒体文件时添加结束 Python 循环

Question

Python 的新功能，使用 Raspberry Pi、GPIO 和 pygame。如果在播放媒体文件时按下按钮，我想结束循环。

现在我有了它，所以你按下按钮，mp3 文件就会一直播放（这是一个 30 分钟的剪辑）。我希望这样，如果再次按下按钮，媒体会重置并从头开始播放。

我尝试添加一个中断和一个 if 语句，但它只是忽略它，因为 mp3 文件已经在播放。我该怎么做？

我的代码如下所示：

while True:

while GPIO.input(buttonPin) == GPIO.LOW:
    if GPIO.input(buttonPin) == GPIO.LOW:
        pygame.mixer.init()
        pygame.mixer.music.load(open("audio.mp3"))
        pygame.mixer.music.play()
        while pygame.mixer.music.get_busy():
            time.sleep(1)
    else:
        break

Answer 1

试试这个：

musicplay = False       #This variable will be used as a "toggle". When the button is pressed, it will flick from false to true, or true to false

def playbackmedia(): # Define function that is called when button pin is pressed
        
        global musicplay # musicplay is a global variable that is outside of the scope of function
        
        musicplay = not musicplay # Here we are toggling the music play 
        
        if musicplay: # if music play is true, play music
                pygame.mixer.init()
                pygame.mixer.music.load(open("audio.mp3"))
                pygame.mixer.music.play()
        else:  # if music play is false, stop the music
                pygame.mixer.stop()

def loop():
        
        #GPIO here add_event_detect will detect when the buttonPin has a falling edge (Just as the button is pressed)
        #The bounce time is to give you enough time for the signal to be read clearly. If this wasn't used, when you press the button,
        #because of mechanical vibration, the connections fluctuate and it could be read by the Pi as pressing the button really quickly over and over 
        #again until you let go of the button. You have 300 milliseconds to let go of the button before the playback media function is called
        
        GPIO.add_event_detect(buttonPin, GPIO.FALLING, callback=playbackmedia, bouncetime=300) 
        
        while True:
               pass

我建议您访问 pygame 网站以了解有关如何控制混音器的更多详细信息。

https://www.pygame.org/docs/ref/mixer.html

我还建议您访问此网站以获取有关 GPIO.RPi 模块的更多信息

https://sourceforge.net/p/raspberry-gpio-python/wiki/Examples/

如何在播放媒体文件时添加结束 Python 循环

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