音频位置在 kivy 中没有改变

Question

我正在使用 kivy.core.audio.Sounloader 在 kivy 中创建一个音乐播放器，我遇到了一个问题。当用户点击开始按钮时，我希望他们能够滑动滑块并更改歌曲的位置，但是，该功能不起作用。它也不会引发任何错误，只是不起作用。我也尝试用 music_obj.get_pos() 获取歌曲的位置，但它总是返回 0。我做了几次搜索，其他人似乎也有这个问题。我该如何解决这个问题？我的代码：

from kivy.app import App from kivy.core.audio import SoundLoader from kivy.uix.widget import Widget from kivy.lang import Builder Builder.load_string(''' <MyLayout>: BoxLayout: orientation: "vertical" size: root.width, root.height Label: id: song_title text: "Song title!" text_size: self.size font_size: 32 valign: "middle" halign: "center" Slider: id: slider min: 0 max: 1 step: 1 value: 0 on_value: root.change_pos(self.value) Button: text: "Animate!" font_size: 32 on_release: root.start_song()''') class MyLayout(Widget): music_file = "pitbull-feat-kesha-pitbull-feat-keshatimber.mp3" music_obj = None def start_song(self): self.music_obj = SoundLoader.load(self.music_file) if self.music_obj: print(self.music_obj.source) print(self.music_obj.length) self.ids.song_title.text = self.music_obj.source self.ids.slider.max = self.music_obj.length self.music_obj.play() def change_pos(self, value): if self.music_obj is not None: self.music_obj.seek(value) class Awesome(App): def build(self): self.title = "Hello!" return MyLayout() if __name__ == "__main__": Awesome().run()

Answer 1

我试过运行您的代码，搜索栏在播放时工作正常。音乐停止后，搜索栏将停止工作。如果是你遇到的问题，建议你先播放一遍音频再求。

    def change_pos(self, value):
        if self.music_obj is not None:
            self.music_obj.play()
            self.music_obj.seek(value)

顺便用了Kivy 2.0.0和ffpyplayer 4.3.2

Answer 2

我正在使用 kivy 2.0.0。在我安装 ffpyplayer-4.3.2 之前，问题的代码无法运行。现在，它起作用了！

这是初始问题中提供的代码的改进版本。现在，随着 mp3 文件的播放，滑块位置会更新。这是在单独的线程中异步完成的。

from kivy.app import App
from kivy.core.audio import SoundLoader
from kivy.uix.widget import Widget
from kivy.lang import Builder

import os, time, threading

SLIDER_UPDATE_FRENQUENCY = 1

if os.name == 'posix':
    AUDIO_DIR = '/storage/emulated/0/Download/Audiobooks/Various/'
else:
    AUDIO_DIR = 'D:\Users\Jean-Pierre\Downloads\Audiobooks\Various\'

Builder.load_string('''
<MyLayout>:
    BoxLayout:
        orientation: "vertical"
        size: root.width, root.height

        Label:
            id: song_title
            text: "Song title!"
            text_size: self.size
            font_size: 32
            valign: "middle"
            halign: "center"

        Slider:
            id: slider
            min: 0
            max: 1
            step: 1
            value: 0
            on_value: root.change_pos(self.value)

        Button:
            text: "Animate!"
            font_size: 32
            on_release: root.start_song()''')


class AsynchSliderUpdater:
    def __init__(self, music_obj, slider):
        self.music_obj = music_obj
        self.slider = slider
    
    def updateSlider(self):
        music_length = self.music_obj.length
        stop = False
        
        while not stop:
            time.sleep(SLIDER_UPDATE_FRENQUENCY)
            music_pos = self.music_obj.get_pos()
            if music_pos < music_length:
                self.slider.value = music_pos
            else:
                stop = True

class MyLayout(Widget):
    """
    WARNING

    Only works if ffpyplayer is installed !
    (C:\Program Files\Python39> ./python -m pip install ffpyplayer
    Successfully installed ffpyplayer-4.3.2)
    
    NOT WORKING ON ANDROID SINCE INSTALLING FFPYPLAYER FAILS !
    """
    
    music_file = AUDIO_DIR + "Un résumé audio de ce qu'enseigne ' Le Cours en Miracles '.mp3"
    music_obj = None

    def start_song(self):
        self.music_obj = SoundLoader.load(self.music_file)
        if self.music_obj:
            print(self.music_obj.source)
            print(self.music_obj.length)
            self.ids.song_title.text = self.music_obj.source
            self.ids.slider.max = self.music_obj.length
            
            self.sliderAsynchUpdater = AsynchSliderUpdater(self.music_obj, self.ids.slider)
            t = threading.Thread(target=self.sliderAsynchUpdater.updateSlider, args=())
            t.daemon = True
            t.start()

            self.music_obj.play()

    def change_pos(self, value):
        if self.music_obj is not None:
            # test required to avoid mp3 playing perturbation
            if abs(self.music_obj.get_pos() - value) > SLIDER_UPDATE_FRENQUENCY:
                print(value)
                self.music_obj.seek(value)


class Awesome(App):
    def build(self):
        self.title = "Hello!"
        return MyLayout()


if __name__ == "__main__":
    Awesome().run()

音频位置在 kivy 中没有改变

Audio position does not change in kivy

python

audio-player

python-3.x

kivy