How to show the song download represented by duration time of it - actionscript-3

Question

What i'm trying to do is to show the song download progress in form of song duration time. For example: 00:00, 01:05, 02:14, 03:58, .... 04:13 being 04:13 the song total duration. So far i have this code:
var soundClip:Sound;
var sTransform:SoundTransform = new SoundTransform(0.1);
function init() {
soundClip = new Sound();
soundClip.load(new URLRequest("magneto.mp3"));
//soundClip.load(new URLRequest("making.mp3"));
soundClip.addEventListener(Event.COMPLETE, soundLoaded);
soundClip.addEventListener(ProgressEvent.PROGRESS, soundLoading);
}
init();
function convertTime(millis:Number):String{
var displayMinutes:String;
var displaySeconds:String;
var Minutes:Number = (millis % (1000*60*60)/(1000*60));
var Seconds:Number = ((millis % (1000*60*60)) % (1000*60))/1000;
if(Minutes<10){
displayMinutes = "0"+Math.floor(Minutes);
}else{
displayMinutes = Math.floor(Minutes).toString();
}
if(Seconds<10){
displaySeconds = "0"+Math.floor(Seconds);
}else{
displaySeconds = Math.floor(Seconds).toString();
}
return displayMinutes + ":" + displaySeconds;
}
function soundLoaded(e:Event) {
soundClip.play(0,0,sTransform);
}
function soundLoading(e:ProgressEvent) {
trace(convertTime(soundClip.length));
}
As you can see, i'm testing it out with two songs, according to the code above the duration time of both are: 03:52 and 11:28 but according to the window these two songs last 03:52 and 05:44. Here is the code and both mp3 files.
Thank you.
EDIT:I'm analizing this page wicht play the song making.mp3, after debbuging it i realized that there is a value wicht is passed to the player, and go this way: 0, 0, 2664, 7576,...344370 these values are shown as*00:00, 01:05, 02:14, 03:58, .... 04:13* as the download progress. Knowing where this data come from would solve my problem, initially i thought it would be obtein through length propety but this only worked well for the magneto.mp3 file not for both songs.
On the whole i want to show:
00:00, 00:23, 01:23...03:57(where 03:57 is the duration time of any song) as the download progress.
Thank you for helping me. Cheers :)

Answer 1

Your code has no problems and your technique is correct.
You only need to fetch the total duration at the end of the download. The value of the file length changes as more data is retrieved. If your download stops before reaching the end, you will only have the length of the incomplete file. Add another handler possibly to check for errors, and if fired, let the user know that the file download is still incomplete.
Update: I figured it out. Add a call to convertTime() in the soundLoaded() method.
What is happening is that the file length is being updated in the PROGRESS event handler. But the final length is often only available in the COMPLETE event, because the PROGRESS event handler is called only when the file download is incomplete and not after it is ready.
Keep the convertTime() call in the PROGRESS event handler as you do presently.
private function soundLoaded(e:Event):void
{
soundClip.play(0, 0, sTransform);
trace(convertTime(soundClip.length));
}
This should do it.
Update 2: This is a known issue reported online at many forums. The length of any sound file sampled at less than 44 khz is reported incorrectly while the download is in progress. It's only after the download completes that the correct duration is reported. This only affects SWF files version 9 or less.
Changing the output SWF to version 10+ fixes the issue.