ActionScript 3中Sound.length和SoundChannel.position的区别

Question

谁能告诉我为什么或者我必须做什么来解决下面的问题？

我加载了一首歌曲，当我获得长度时，歌曲永远不会达到这个值。

这是另一个人AS3 – SoundChannel.position never reaches Sound.length的问题文档

下面是我的代码

import flash.display.Sprite;
import flash.net.URLRequest;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.events.Event;
import flash.events.IOErrorEvent;


var snd:Sound = new Sound();
var channel:SoundChannel;
var statusTextField:TextField  = new TextField();


    statusTextField.autoSize=TextFieldAutoSize.LEFT;

    var req:URLRequest=new URLRequest("http://localhost/chance_teaser.mp3");

    try {
        snd.load(req);

        channel=snd.play();
    } catch (err:Error) {
        trace(err.message);
    }

    snd.addEventListener(IOErrorEvent.IO_ERROR, errorHandler);
    addEventListener(Event.ENTER_FRAME, enterFrameHandler);
    channel.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);

    this.addChild(statusTextField);


function enterFrameHandler(event:Event):void {
    var loadTime:Number=snd.bytesLoaded/snd.bytesTotal;
    var loadPercent:uint=Math.round(100*loadTime);
    var estimatedLength:int = Math.ceil(snd.length / (loadTime));
    var playbackPercent:uint = Math.round(100 * (channel.position / estimatedLength));

    statusTextField.text = "Sound file's size is " + snd.bytesTotal + " bytes.\n" 
                                       + "Bytes being loaded: " + snd.bytesLoaded + "\n" 
                                       + "Percentage of sound file that is loaded " + loadPercent + "%.\n"
                                       + "Sound playback is " + playbackPercent + "% complete. \n"
                                       + "Lengh of sound is " + snd.length + "\n"
                                       + "Pos of sound is " + channel.position + "\n";
}

function errorHandler(errorEvent:IOErrorEvent):void {
    statusTextField.text="The sound could not be loaded: "+errorEvent.text;
}

function soundCompleteHandler(event:Event):void {
    statusTextField.text = statusTextField.text + "\n The sound has finished playing.";
    removeEventListener(Event.ENTER_FRAME, enterFrameHandler);
}

Answer 1

这是Flash中的一个已知问题，如果你在周围搜索，你会找到几个关于这个问题的论坛帖子。据我所知，你要么自己滚，要么找一个为你做这件事的库。

有几个项目确实可以(正确地)处理音频。在Here's上查看它们的列表。

您可能要查看的第一个是popforge开源音频库。