在Android装置上播放mp3吗? [英] Playing mp3 on Android?

问题描述

我正在尝试将Kivy的音频播放器作为个人项目制作，但是我发现我的应用无法加载mp3音频.经过一些研究，似乎与某些许可问题有关?当然，无论如何，Android仍然可以播放mp3文件，那么该怎么办呢?

I am trying to make an audio player for Kivy as a personal project however I noticed that my app fails to load mp3 audio. After a little research it seems to be related to some licensing issue? In any case androids can still play mp3 files of course so what can I do to make this happen?

按现状，我使用的是来自kivy的普通SoundLoader()类.我认为我的Android音频使用的是sdl2，但我可能会误认为我不确定该在哪里检查，我只是记得在某处看到过它.我还尝试过更改KIVY_AUDIO环境变量，但是它没有用(我以为我做错了).

As it stands I am using the normal SoundLoader() class from kivy. I think my android audio is using sdl2 but I could be mistaken as I am not sure where to check this I just remember seeing it somewhere. I have also tried changing the KIVY_AUDIO environment variable but it didn't work (I assume I did something wrong).

有人因为我似乎找不到任何解决方法而知道任何解决方法吗?

Does anyone know of any work arounds because I can't seem to find any?

推荐答案

奇异的SoundLoader类存在一些问题(例如，在某些mp3文件中无法正确搜索).正如Joey提到的那样，jnius可以访问原始的android类，效果更好，并且可以将大多数歌曲文件(mp3，mp4，flac，wave等)扔给它.

the kivy SoundLoader class has some problems (eg. it does not seek correctly in certain mp3 files). As Joey mentions the original android class which can be accessed by jnius works better and with most songfiles you throw at it (mp3, mp4, flac,waves etc.)

我制作了两个工作类，一个工作类用于使用jnius的android，另一个工作于Windows(当然android类在这里不起作用).

I made two working classes, one for android which uses jnius and one for windows (of course the android class does not work here).

您可能必须更新到最新版本，并添加gstreamer，如文档中所述.并且:kivy logger在android上的unicode存在一些问题，并且在打印时会引发异常.声音听起来不错.如果异常使您烦恼，请删除kivy.info行.

You may have to update to the newest kivy and add gstreamer like described in the documentation. and: kivy logger has some problems with unicode on android and throws an exception when printing. sound plays fine though. If the exception annoys you, delete the kivy.info lines.

#coding: utf-8

from kivy.core.audio import SoundLoader
from kivy.utils import platform 
from kivy.logger import Logger
import time

class MusicPlayerAndroid(object):
    def __init__(self):

        from jnius import autoclass
        MediaPlayer = autoclass('android.media.MediaPlayer')
        self.mplayer = MediaPlayer()

        self.secs = 0
        self.actualsong = ''
        self.length = 0
        self.isplaying = False

    def __del__(self):
        self.stop()
        self.mplayer.release()
        Logger.info('mplayer: deleted')

    def load(self, filename):
        try:
            self.actualsong = filename
            self.secs = 0
            self.mplayer.setDataSource(filename)        
            self.mplayer.prepare()
            self.length = self.mplayer.getDuration() / 1000
            Logger.info('mplayer load: %s' %filename)
            Logger.info ('type: %s' %type(filename) )
            return True
        except:
            Logger.info('error in title: %s' % filename) 
            return False

    def unload(self):
            self.mplayer.reset()

    def play(self):
        self.mplayer.start()
        self.isplaying = True
        Logger.info('mplayer: play')

    def stop(self):
        self.mplayer.stop()
        self.secs=0
        self.isplaying = False
        Logger.info('mplayer: stop')

    def seek(self,timepos_secs):
        self.mplayer.seekTo(timepos_secs * 1000)
        Logger.info ('mplayer: seek %s' %int(timepos_secs))


class MusicPlayerWindows(object):
    def __init__(self):
        self.secs = 0
        self.actualsong = ''
        self.length = 0
        self.isplaying = False
        self.sound = None

    def __del__(self):
        if self.sound:
            self.sound.unload()
            Logger.info('mplayer: deleted')

    def load(self, filename):
        self.__init__()
        if type(filename) == unicode: filename = filename.encode('utf-8') #unicode does not work ! 
        self.sound = SoundLoader.load(filename)    
        if self.sound:
            if self.sound.length != -1 :
                self.length = self.sound.length
                self.actualsong = filename
                Logger.info('mplayer: load %s' %filename)
                return True
            else:
                Logger.info ('mplayer: songlength = -1 ...')
        return False

    def unload(self):
        if self.sound != None:
            self.sound.unload()
            self.__init__ # reset vars

    def play(self):
        if self.sound:
            self.sound.play()
            self.isplaying = True
            Logger.info('mplayer: play')

    def stop(self):
        self.isplaying = False
        self.secs=0
        if self.sound:
            self.sound.stop()
            Logger.info('mplayer: stop')

    def seek(self, timepos_secs):
        self.sound.seek(timepos_secs)
        Logger.info('mplayer: seek %s' %int(timepos_secs))

def main():
    songs = [
        'f:\\_mp3_\\_testdir_\\file of ☠☢☣.mp3', #insert songs here
        'f:\\_mp3_\\Patricks Mp3s\\electro\\Echotek - Freak Africa.mp3',
        'f:\\_mp3_diverse_\\Testsuite\\flac\\01 - Jam & Spoon - Stella (Jam & Spoon Mix).flac',
        'f:\\_mp3_\\P1\\1Start\\Hot Chip - boy from school.mp4'
        ]

    Logger.info ('platform: %s' %platform)

    if platform == 'win':
        mplayer = MusicPlayerWindows()
    elif platform == 'android':
        mplayer = MusicPlayerAndroid()
    else:
        exit()

    for s in songs:
        if mplayer.load(s): # checking load, seek
            mplayer.play()
            time.sleep(2)
            mplayer.seek(90)
            time.sleep(2)
            mplayer.stop()
            mplayer.unload()

        else:
            Logger.info ('cant load song: %s' %s)


if __name__ == '__main__':
    main()

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