Sound visualizer using SoundMixer

This time you'll get a complete class drawing a visualizer graph for the sound playing(or, actually the bytes in the sound). You can show the graph as a raw sound wave or as grouped by frequency(where a fourier transformation has been applied). This is just a simple demo, but you can separate out different frequencies to get some really cool effects. Play around with it and see what you get. PS: You do need to provide your own sound ;-)

package {
import flash.display.GradientType;
import flash.display.MovieClip;
import flash.events.Event;
import flash.media.Sound;
import flash.media.SoundMixer;
import flash.net.URLRequest;
import flash.utils.ByteArray;

[SWF(width='512',height='300',backgroundColor='0x000000',frameRate='30')]

public class SpectrumTest extends MovieClip{

private var _eql:Boolean = true;//Show as grouped by frequenzy
private var _completeGraph:Boolean = false;//Complete graph fill
private var _spikeAmp:uint = 100;//Amplifier for graph peaks
private var _graphFill:Array = new Array(0xFF0000, 0xFFDF21);//Colorfill for graph

private var _soundBytes:ByteArray;

public function SpectrumTest(){
var s:Sound = new Sound(new URLRequest("yoursoundfile.mp3"));
s.play(0, 3);
this._soundBytes = new ByteArray();
this.addEventListener(Event.ENTER_FRAME, drawGraphHandler);
}

private function drawGraphHandler(evt:Event):void{
graphics.clear();
graphics.clear();
graphics.beginGradientFill(GradientType.LINEAR, this._graphFill, [1,1],[0,255]);
graphics.moveTo(-1, 150);

//Get the bytes
SoundMixer.computeSpectrum(this._soundBytes,this._eql);

for(var i:uint=0; i<(stage.stageWidth * .5); i++){ 

var num:Number = -this._soundBytes.readFloat() * this._spikeAmp + stage.stageHeight * .5; 

graphics.lineTo(i*2, num); 

} 

if(this._completeGraph){ 

graphics.lineTo(512, 300); 

graphics.lineTo(0, 300); 

graphics.lineTo(-1, 150); 

} 

} 

} 

}