ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Working with sound
import flash.display.Graphics;
import flash.events.Event;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.media.SoundMixer;
import flash.net.URLRequest;
const PLOT_HEIGHT:int = 200;
const CHANNEL_LENGTH:int = 256;
var snd:Sound = new Sound();
var req:URLRequest = new URLRequest("bigSound.mp3");
snd.load(req);
var channel:SoundChannel;
channel = snd.play();
addEventListener(Event.ENTER_FRAME, onEnterFrame);
snd.addEventListener(Event.SOUND_COMPLETE, onPlaybackComplete);
var bytes:ByteArray = new ByteArray();
function onEnterFrame(event:Event):void
{
SoundMixer.computeSpectrum(bytes, false, 0);
var g:Graphics = this.graphics;
g.clear();
g.lineStyle(0, 0x6600CC);
g.beginFill(0x6600CC);
g.moveTo(0, PLOT_HEIGHT);
var n:Number = 0;
// left channel
for (var i:int = 0; i < CHANNEL_LENGTH; i++)
{
n = (bytes.readFloat() * PLOT_HEIGHT);
g.lineTo(i * 2, PLOT_HEIGHT - n);
}
g.lineTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT);
Last updated 6/6/2012
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