var url:String = "";

var soundFactory:Sound;
var channel:SoundChannel;
var oldChannel:SoundChannel;

var channelStack:Array = new Array();

var vvolume:Number = 1;

var positionTimer:Timer;
var isMusicPlaying = false;
var startPosition:Number = 0;

playpausebtn.addEventListener(MouseEvent.CLICK, togglePlayback);
stopbtn.addEventListener(MouseEvent.CLICK, stopPlayback);
volup.addEventListener(MouseEvent.CLICK, mup);
voldown.addEventListener(MouseEvent.CLICK, mdn);
openbtn.addEventListener(MouseEvent.CLICK, oopf);


function oopf(e:Event):void
{
    isMusicPlaying = false;
    url = uuurl.text.substring(0, uuurl.text.length-1);
    SoundChannelExample();
}

function mup(e:Event):void
{
    if(isMusicPlaying){
        vvolume+=0.1;
        var trans:SoundTransform;
        trans = new SoundTransform(vvolume, 0);
        channel.stop();
        startPosition = channel.position;
        channel = soundFactory.play(startPosition,1,trans);
    }
}

function mdn(e:Event):void
{
    if(vvolume >= 0.1 && isMusicPlaying){
        vvolume-=0.1;
        var trans:SoundTransform;
        trans = new SoundTransform(vvolume, 0);
        channel.stop();
        startPosition = channel.position;
        channel = soundFactory.play(startPosition,1,trans);
    }
}

function stopPlayback(e:Event):void
{
    channel.stop();
    channel = soundFactory.play(0);
    startPosition = channel.position;
    isMusicPlaying = false;
    channel.stop();

    //trace(channelStack.length);
    if(channelStack.length > 0) {channel = channelStack.pop(); startPosition = channel.position; isMusicPlaying = true;}
}
function togglePlayback(e:Event):void
{
 if (isMusicPlaying)
    {
        startPosition = channel.position;
        channel.stop();
        isMusicPlaying = false;
    }
    else
    {
        channel = soundFactory.play(startPosition);
        isMusicPlaying = true;
    }
}

function SoundChannelExample() {
    var request:URLRequest = new URLRequest(url);
    soundFactory = new Sound();

    soundFactory.addEventListener(Event.COMPLETE, completeHandler);
    soundFactory.addEventListener(Event.ID3, id3Handler);
    soundFactory.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
    soundFactory.addEventListener(ProgressEvent.PROGRESS, progressHandler);

    soundFactory.load(request);

    if (channel!=null && !ovcheck.selected) channel.stop();
    else if(ovcheck.selected) channelStack.push(channel);

    channel = soundFactory.play();
    channel.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);
    channel.stop();

    positionTimer = new Timer(50);
    positionTimer.addEventListener(TimerEvent.TIMER, positionTimerHandler);
    positionTimer.start();
}


 function positionTimerHandler(event:TimerEvent):void {
    //trace("positionTimerHandler: " + channel.position.toFixed(2) + " VOL: " + channel.soundTransform.volume);

    timeStamp.text = "Progress: " + (channel.position / soundFactory.length*100).toFixed(2) + "% ~ "
     +(channel.position/1000).toFixed(0) + " / " + (soundFactory.length/1000).toFixed(0) + " sec."
     + " VOL: " + channel.soundTransform.volume;
}

 function completeHandler(event:Event):void {
    //trace("completeHandler: " + event);
}

 function id3Handler(event:Event):void {
    //trace("id3Handler: " + event);
}

 function ioErrorHandler(event:Event):void {
    trace("ioErrorHandler: " + event);
    positionTimer.stop();
}

 function progressHandler(event:ProgressEvent):void {
    //trace("progressHandler: " + event);
}

 function soundCompleteHandler(event:Event):void {
    trace("soundCompleteHandler: " + event);
    positionTimer.stop();
}