forked from: Pitch Shifter
/**
* Copyright aaarghhh ( http://wonderfl.net/user/aaarghhh )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/vTkm
*/
// forked from k__'s Pitch Shifter
package {
import flash.display.*;
import flash.events.*;
import flash.net.*;
import flash.text.*;
import flash.ui.*;
import flash.utils.ByteArray;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.media.SoundTransform;
import flash.media.SoundMixer;
public class Main extends Sprite {
var progTxt:TextField;
var levelTxt:TextField;
var level:uint = 0;
var fr:FileReference;
var soundData:ByteArray;
var sourceSound:Sound;
var sound:Sound;
var soundURL:String = "http://www.kynd.info/flash/sound/jazz.mp3";
var channel:SoundChannel;
var pitchRatio:Number;
public function Main() {
sound = new Sound();
sourceSound = new Sound();
sound.addEventListener(SampleDataEvent.SAMPLE_DATA,h_sampleData);
sourceSound.addEventListener(ProgressEvent.PROGRESS,h_loadProgress);
sourceSound.addEventListener(Event.COMPLETE,h_loadComplete);
sourceSound.load(new URLRequest(soundURL));
setUI();
}
private function setUI():void {
addChild(progTxt = new TextField());
var tf:TextFormat = new TextFormat();
tf.size = 24;
tf.font = "_sans";
tf.color = 0xdddddd;
progTxt.defaultTextFormat = tf;
progTxt.x = 22;
progTxt.y = 20;
progTxt.width = 420;
addChild(levelTxt = new TextField());
tf.size = 60;
tf.color = 0x333333;
levelTxt.defaultTextFormat = tf;
levelTxt.x = 20;
levelTxt.y = 60;
levelTxt.width = 420;
updateLevelTxt();
var msgTxt:TextField;
addChild(msgTxt = new TextField());
tf.size = 18;
msgTxt.defaultTextFormat = tf;
msgTxt.x = 22;
msgTxt.y = 120;
msgTxt.width = 420;
msgTxt.text = "use up/down arrow keys to change the value";
stage.addEventListener(KeyboardEvent.KEY_DOWN, h_keyDown)
}
private function h_keyDown(evt:KeyboardEvent):void {
if (evt.keyCode == Keyboard.DOWN && level > -5) {
level --;
}
if (evt.keyCode == Keyboard.UP && level < 24) {
level ++;
}
pitchRatio = Math.pow(2, level / 12);
updateLevelTxt();
}
private function updateLevelTxt():void {
levelTxt.text = "Pitch: +" + level;
}
/* load MP3 File */
private function h_loadProgress(evt:ProgressEvent):void {
var loaded:uint = evt.bytesLoaded;
var total:uint = evt.bytesTotal;
var msg:String = "Loading " + Math.floor(loaded / total * 100)+ "%";
progTxt.text = msg;
}
private function h_loadComplete(evt:Event):void {
var msg:String = "Load Complete";
progTxt.text = msg;
playSound();
}
/* sound playback */
private function playSound():void {
channel = sound.play();
channel.addEventListener(Event.SOUND_COMPLETE, h_soundComplete);
}
private function h_soundComplete(evt:Event):void {
playSound();
}
private function h_sampleData(evt:SampleDataEvent):void {
var bytes:ByteArray = new ByteArray();
var avail:Number;
avail = sourceSound.extract(bytes, 8192);
if (avail == 0) {
sourceSound.extract(bytes, 8192, 0);
}
evt.data.writeBytes(processSound(bytes));
}
private function processSound(bytes:ByteArray):ByteArray {
var returnBytes:ByteArray = new ByteArray();
bytes.position = 0;
var cnt:Number = 0;
var threshold:Number = 0;
while(bytes.bytesAvailable > 0) {
returnBytes.writeFloat(bytes.readFloat());
returnBytes.writeFloat(bytes.readFloat());
cnt += 1 - 1 / pitchRatio;
while (bytes.bytesAvailable > 0 && cnt >= threshold) {
bytes.position += 8;
threshold += 1;
cnt += 1 - 1 / pitchRatio;
}
}
return returnBytes;
}
}
}