sound spectrum

Actionscript: SoundMixer.computeSpectrum()
Source: The Flash blog[link]

Action Sclipt video tutorial[link]

//////////////////////code sample /////////////////////////

1. var s:Sound = new Sound();
2. var sc:SoundChannel;
3. var ba:ByteArray = new ByteArray();
4. var array:Array;
6. s.load(new URLRequest("mix.mp3"));
7. sc = s.play(0,1000);
9. this.addEventListener(Event.ENTER_FRAME, spectrum);
11. var a:Number = 0;
13. function spectrum(event:Event)
14. {
15. a = 0;
16. graphics.clear();
17. SoundMixer.computeSpectrum(ba,true,0);
18. for(var i=0; i <256; i=i+8)
19. {
20. a = ba.readFloat();
21. var num:Number = a*360;
22. graphics.lineStyle(num/15,0x0066FF|(num <<8));
23. graphics.drawCircle(stage.stageWidth/2,stage.stageHeight/2,i);
24. }
26. }