Claus Wahlers just released an update for FZIP, a AS3 class library to load, extract/decompress files.

Main updates are:

• Added support for Adobe Air. The Adobe Air runtime provides a low level inflate method, making it possible to load any ZIP archive and decompress compressed files without the need of injecting Adler32 checksums.
• Added FZipLibrary class for higher level access to files in a ZIP archive. ?FZipLibrary processes files (based on file extensions) from an FZip instance and converts them into usable formats. Files can be converted to either a BitmapData or DisplayObject classes. Data embedded in SWF files (like classes) can also be retrieved. Flash?s built-in Loader class is used to convert formats, so the only formats currently supported are ones that Loader supports. As of this writing they are SWF, JPEG, GIF, and PNG.?
• Bug fix: There was a problem with filenames containing special characters. Filename encoding now defaults to UTF-8. In case the filenames are encoded differently in your ZIP, you can specify the encoding in the FZip constructor.

This is an example of how the computeSpectrum works on Flash CS3, I’ts just great the posible things you can make with it , this is based on a great example made by Peter deHaan In my example I just made the spectrum being represented by circles and have a gradient fill across the spectrum here’s the link.

And here’s the script:

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var url:String ="songs/mysong.mp3";
var request:URLRequest = new URLRequest(url);
var s:Sound = new Sound();
s.addEventListener(Event.COMPLETE, completeHandler);
s.load(request);
var song:SoundChannel = s.play();
song.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);
var ba:ByteArray = new ByteArray();
 
var gr:Sprite = new Sprite();
 
gr.x = 20;
gr.y = 200;
 
addChild(gr);
 
var time:Timer = new Timer(50);
time.addEventListener(TimerEvent.TIMER, timerHandler);
time.start();
 
function completeHandler(event:Event):void {
	event.target.play();
}
function soundCompleteHandler(event:Event):void {
	time.stop();
}
function timerHandler(event:TimerEvent):void {
	SoundMixer.computeSpectrum(ba, true);
	var i:int;
	// Gradien Fill
	var fillType:String = GradientType.LINEAR;
	var colors:Array = [0xFF0000, 0x0000FF];
	var alphas:Array = [100, 100];
	var ratios:Array = [0x00, 0xFF];
	var matr:Matrix = new Matrix();
	matr.createGradientBox(400, 20, 0, 0, 0);
	var spreadMethod:String = SpreadMethod.PAD;
	// ends fill
	gr.graphics.clear();
	gr.graphics.lineStyle(0, 0xFF0000);
	gr.graphics.beginGradientFill(fillType, colors, alphas, ratios, matr, spreadMethod);
	gr.graphics.moveTo(0, 0);
	var w:uint = 2;
	for (i=0; i<512; i+=w) {
		var t:Number = ba.readFloat();
		var n:Number = (t * 100);
 
		gr.graphics.drawCircle(i, w, -n);
 
	}
}