使用PyGame混音器播放声音无法正常工作

Question

我正在做一个使用PyGame和Tkinter制作音乐播放器的项目。到目前为止，我已经建立了界面并让播放器播放两首不同的歌曲，但是我需要一些有关如何更好地使用PyGame混音器的建议。我的代码是：

from tkinter import *
import time, sys
from pygame import mixer

track_names = ['lady maria', 'cleric beast']
current_track = ''


def press(word):
    global track_name
    global current_track
    word = button_text.get()
    if word == 'PLAY':
        update_button_text('PLAY')
        for name in track_names:
            window_2.delete(0, 'end')
            current_track = name

            window_2.configure(state='normal')
            window_2.insert('end', name)

            mixer.init()
            mixer.music.set_volume(100)
            mixer.music.load(f'C:/Users/user/Desktop/python/projects/etc/{name}.mp3')
            mixer.music.play()
            time.sleep(5)

    if word == 'PAUSE':
        update_button_text('PAUSE')
        mixer.music.pause()
        time.sleep(5)

    if word == 'STOP':
        mixer.music.stop()
        time.sleep(5)

    if word == 'NEXT':
        pass

    if word == 'PREVIOUS':
        pass


def update_button_text(word):
    if word == 'PLAY':
        button_text.set('PAUSE')
    elif word == 'PAUSE':
        button_text.set('PLAY')


if __name__ == '__main__':
    # create application window
    app = Tk()

    # title
    app.title("Music Players")

    # geometry
    app.geometry('383x121')

    # background color
    app.configure(bg='orange')

    equation = StringVar()
    window_1 = Label(app, textvariable=equation)
    window_1.grid(columnspan=4, ipadx=100, ipady=10)
    equation.set('music player')

    window_2 = Entry(app, width=30)
    window_2.grid(columnspan=4, ipadx=100, ipady=10)
    window_2.configure(state='disabled')

    window_2.grid_columnconfigure((0, 1, 2), uniform="equal", weight=1)

    # Create buttons
    button_text = StringVar()
    button_text.set("PLAY")
    button1 = Button(app, textvariable=button_text, fg='yellow', bg='purple',
                     command=lambda: press(button_text), height=2, width=1)
    button1.grid(row=2, column=0, sticky="NSEW")

    button2 = Button(app, text='STOP', fg='yellow', bg='purple',
                     command=lambda: press('STOP'), height=2, width=1)
    button2.grid(row=2, column=1, sticky="NSEW")

    button3 = Button(app, text='NEXT', fg='yellow', bg='purple',
                     command=lambda: press('NEXT'), height=2, width=1)
    button3.grid(row=2, column=2, sticky="NSEW")

    button4 = Button(app, text='PREVIOUS', fg='yellow', bg='purple',
                     command=lambda: press('PREVIOUS'), height=2, width=1)
    button4.grid(row=2, column=3, sticky="NSEW")

# start the GUI
app.mainloop()

因此，当我运行代码并单击 PLAY 时，播放器似乎已停止响应。尽管它会立即开始播放音乐，但不会显示标题。我有将歌曲的标题首先插入Tkinter条目的代码，然后是混音器函数，但是似乎总是先混音器函数。这是我遇到问题的部分（我认为）：

def press(word):
    global track_name
    global current_track
    word = button_text.get()
    if word == 'PLAY':
        update_button_text('PLAY')
        for name in track_names:
            window_2.delete(0, 'end')
            current_track = name

            window_2.configure(state='normal')
            window_2.insert('end', name)

            mixer.init()
            mixer.music.set_volume(100)
            mixer.music.load(f'C:/Users/user/Desktop/python/projects/etc/{name}.mp3')
            mixer.music.play()
            time.sleep(5)

为什么会这样？我应该如何修复代码以制作更好的音乐播放器？对此的任何建议将不胜感激！

Answer 1

问题在于您的代码在遍历音轨时阻止了TKinter主事件循环。事件驱动程序无法阻止其事件，这就是为什么您看到窗口“锁定”的原因-无需重新绘制，调整大小，关闭等。控制这些内容的窗口代码永远不会收到消息，也永远无法对他们采取行动。

您的应用程序代码必须从不阻塞该循环超过一秒钟。

那么您该怎么做...使用计时器或线程完成应用程序的工作。计时器易于使用，它们只是在主循环中将函数调用添加到队列中。在 X 毫秒后，将调用该函数。

例如：

window = tk.Tk()

[...]

window.after( 1000, myFunction, arg1 )

将导致主事件循环在1000毫秒后调用您的myFunction( arg1 )。然后在myFunction内部，您可以再次将对myFunction的调用排入队列，形成周期性循环。

PyGame混音器功能已经在单独的线程中播放音乐。因此，在您的情况下，除了轮询以查看音乐是否结束之外，没有任何实际必要。所有“ PLAY”代码所需要做的就是 start 播放下一个声音文件，然后返回。

在主循环中，我们可以创建一个新的计时器功能，以检查声音文件是否仍在播放，或者是否需要将下一个声音排队：

def checkPlaying( main_window ):
    global current_track

    if ( mixer.music.get_busy() == False ):
        # Playing has finished
        print("Sound finished, playing next" )
        track_index, track_name = current_track    
        current_track = ( track_index + 1, '' )     # Advance to next track
        press( 'PLAY' )                             # Start playing

    # Queue the next call to this function
    main_window.after( 250, checkPlaying, main_window )   # call again later

由于它重新排队了一个定时器调用，因此需要在主函数中进行该初始调用：

# Start the Music Playing Check
app.after( 1000, checkPlaying, app )

只需修改press()函数即可删除连续循环，而只播放当前的声音文件：

mixer.init()                 
current_track = ( 0, '' )    # track-index and name


def press(word):
    global track_names
    global current_track

    word = button_text.get()
    if word == 'PLAY':
        update_button_text('PLAY')
        track_index, track_name = current_track
        if ( track_index >= len( track_names ) ):  # if out of music, re-start
            track_index = 0

        # Start Playing the current track
        name = track_names[ track_index ]
        current_track = ( track_index, name )
        mixer.music.set_volume(100)
        mixer.music.load(f'C:/Users/user/Desktop/python/projects/etc/{name}.mp3')
        mixer.music.play()
        
        # Update the GUI
        window_2.delete(0, 'end')
        window_2.configure(state='normal')
        window_2.insert('end', name)

就是这样。

参考代码：

from tkinter import *
import time, sys
from pygame import mixer

mixer.init()

track_names = [ 'car-horn2', 'car-horn', 'cash-register', 'dog-bark', 'duck-quack', 'rain-falling', 'single-ding', 'turkey-gobble' ]
current_track = ( 0, '' )


def press(word):
    global track_names
    global current_track

    word = button_text.get()
    if word == 'PLAY':
        update_button_text('PLAY')
        track_index, track_name = current_track
        if ( track_index >= len( track_names ) ):  # if out of music, re-start
            track_index = 0   

        # Play the current track
        name = track_names[ track_index ]
        current_track = ( track_index, name )
        mixer.music.set_volume(100)
        #mixer.music.load(f'C:/Users/user/Desktop/python/projects/etc/{name}.mp3')
        mixer.music.load(f'{name}.mp3')
        mixer.music.play()

        window_2.delete(0, 'end')
        window_2.configure(state='normal')
        window_2.insert('end', name)

    if word == 'PAUSE':
        update_button_text('PAUSE')
        mixer.music.pause()
        time.sleep(5)

    if word == 'STOP':
        mixer.music.stop()
        time.sleep(5)

    if word == 'NEXT':
        pass

    if word == 'PREVIOUS':
        pass


def checkPlaying( main_window ):
    global track_names
    global current_track

    result = False

    if ( mixer.music.get_busy() == True ):
        # Still playing
        result = True
    else:
        # Playing has finished
        # TODO: Change button states, whatever
        print("Sound finished, playing next" )
        track_index, track_name = current_track
        current_track = ( track_index + 1, '' )
        press( 'PLAY' )        # start next track
        result = False

    # Queue the next call to this function
    main_window.after( 250, checkPlaying, main_window )

    return result


def update_button_text(word):
    if word == 'PLAY':
        button_text.set('PAUSE')
    elif word == 'PAUSE':
        button_text.set('PLAY')


if __name__ == '__main__':
    # create application window
    app = Tk()

    # title
    app.title("Music Players")

    # geometry
    app.geometry('383x121')

    # background color
    app.configure(bg='orange')

    equation = StringVar()
    window_1 = Label(app, textvariable=equation)
    window_1.grid(columnspan=4, ipadx=100, ipady=10)
    equation.set('music player')

    window_2 = Entry(app, width=30)
    window_2.grid(columnspan=4, ipadx=100, ipady=10)
    window_2.configure(state='disabled')

    window_2.grid_columnconfigure((0, 1, 2), uniform="equal", weight=1)

    # Create buttons
    button_text = StringVar()
    button_text.set("PLAY")
    button1 = Button(app, textvariable=button_text, fg='yellow', bg='purple',
                     command=lambda: press(button_text), height=2, width=1)
    button1.grid(row=2, column=0, sticky="NSEW")

    button2 = Button(app, text='STOP', fg='yellow', bg='purple',
                     command=lambda: press('STOP'), height=2, width=1)
    button2.grid(row=2, column=1, sticky="NSEW")

    button3 = Button(app, text='NEXT', fg='yellow', bg='purple',
                     command=lambda: press('NEXT'), height=2, width=1)
    button3.grid(row=2, column=2, sticky="NSEW")

    button4 = Button(app, text='PREVIOUS', fg='yellow', bg='purple',
                     command=lambda: press('PREVIOUS'), height=2, width=1)
    button4.grid(row=2, column=3, sticky="NSEW")

    # Start the Music Playing Check
    app.after( 1000, checkPlaying, app )

# start the GUI
app.mainloop()