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import er4d.util.Delegate;
import er4d.transitions.Tween;

class panik.PlayerMp3 extends MovieClip
{

private var play_btn:MovieClip;
private var pause_btn:MovieClip;
private var timeline:MovieClip;
private var timeline_bg:MovieClip;

private var songTrack:Sound;
private var loaded:Boolean;
private var	_src:String;

private var track_position:Number;
private var track_duration:Number;

private var loading_int:Number;
private var playing_int:Number;

function PlayerMp3()
{
loaded = false;
}

// INIT
public function set src(_src:String) {
this._src = _src;
loaded = false;
}
public function get isLoaded() {
return loaded;
}
public function loadMP3 (autoplay:Boolean) {
songTrack = new Sound();
songTrack.onLoad = Delegate.create(this, songLoaded, autoplay);
songTrack.loadSound(_src, true);
loaded = true;
loading_int = setInterval(this, "checkLoadingProgress", 100);
// CONTROL
timeline._width = 0;
play_btn.onPress = Delegate.create(this, startSound);
pause_btn.onPress = Delegate.create(this, stopSound);
if(autoplay) enablePlayBtn (false);
else enablePlayBtn (true);

}
// SOUND CONTROL
public function stopSound () {
songTrack.stop();
enablePlayBtn (true);
}
public function startSound (n:Number) {
// play
if (!n || songTrack.position == songTrack.duration) n = 0;
songTrack.start(n);
enablePlayBtn (false);
}

public function lock() {
this._x += 5000;
play_btn.enabled = pause_btn.enabled = false;
}
public function unlock() {
this._x -= 5000;
play_btn.enabled = pause_btn.enabled = true;
}

// PRIVATE

// watch song loading
private function checkLoadingProgress () {
var numBytesLoaded:Number = songTrack.getBytesLoaded();
var numBytesTotal:Number = songTrack.getBytesTotal();
var numPercentLoaded:Number = Math.floor(numBytesLoaded / numBytesTotal * 100);
}

// song loaded
private function songLoaded (autoplay:Boolean) {
// play stop
if(!autoplay) stopSound(); else
clearInterval(loading_int);
playing_int = setInterval(this, "checkPlayingProgress", 100);
track_duration = songTrack.duration/1000;
}
private function checkPlayingProgress () {
track_position = songTrack.position/1000;
var track_percent:Number = track_position / track_duration * 100;
if(songTrack.position == songTrack.duration) stopSound();
timeline._width = timeline_bg._width * track_percent / 100;
}

private function enablePlayBtn (b:Boolean){
if (b) {
Tween.prop(play_btn, "_alpha", 100);
play_btn.enabled = true;
Tween.prop(pause_btn, "_alpha", 30);
pause_btn.enabled = false;
} else {
Tween.prop(play_btn, "_alpha", 30);
play_btn.enabled = false;
Tween.prop(pause_btn, "_alpha", 100);
pause_btn.enabled = true;
}
}

}

source