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("p.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); g.endFill();// right channel g.lineStyle(0, 0xCC0066); g.beginFill(0xCC0066, 0.5); g.moveTo(CHANNEL_LENGTH * 2, PLOT_HEIGHT); for (i = CHANNEL_LENGTH; i > 0; i--) { n = (bytes.readFloat() * PLOT_HEIGHT); g.lineTo(i * 2, PLOT_HEIGHT - n); } g.lineTo(0, PLOT_HEIGHT); g.endFill(); } function onPlaybackComplete(event:Event) { removeEventListener(Event.ENTER_FRAME, onEnterFrame); }
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