actionscript中的sound类控制音频文件的操作示例

package 
{
	import fl.controls.Button;
	import fl.controls.Label;
	import flash.display.MovieClip;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.media.Sound;
	import flash.media.SoundChannel;
	import flash.net.URLRequest;
	import flash.media.SoundTransform;
	import fl.controls.Slider;
	import fl.events.SliderEvent;
	/**
	 * ...
	 * @author chb
	 */
	public class progressSoundExample extends Sprite
	{
		var sound:Sound;
		var change:SoundChannel;
		var lab:Label;//显示加载进度
		var labCurrentTime:Label;//显示当前时间
		var labTotalTime:Label;//显示总时间
		var playBtn:Button;//开始按钮
		var stopBtn:Button;//停止按钮
		//记录是否播放，默认是播放
		var play_tag:uint = 1;
		//当前播放位置记录，用于继续播放
		var position:int = 0;
		//声音控制
		var sliderVolume:Slider;
		
		public function progressSoundExample():void
		{
			trace("执行了构造函数");
			lable_Init();
			btn_Init();
			sliderVolume_Init();
			setMain();
		}
		
		public function setMain():void
		{
			//千年等一回http://zhangmenshiting.baidu.com/service/938ae783a3bc193e6d48ea25348e2a93.mp3?xcode=bbd275a68b5dbe3b23d614f88ac17286
			//雪中情《雪山飞狐》http://mul1.waptx.com/music/group/bbs/mp3/43/090116/1232049304420.mp3?z=906727070
			//梦中人《雪山飞狐》http://61.136.63.144/70/%E8%BF%BD%E6%A2%A6%E4%BA%BA.mp3
			var url:URLRequest = new URLRequest("http://zhangmenshiting.baidu.com/service/938ae783a3bc193e6d48ea25348e2a93.mp3?xcode=bbd275a68b5dbe3b23d614f88ac17286");
			sound = new Sound(url);
			change = sound.play(position);
			this.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
		}
		/**
		 * ...........................
		 * 初始化标签
		 */
		public function lable_Init():void
		{
			lab= new Label();
			lab.text = "播放进度：";
			lab.move(10, 50);
			lab.width = 200;
			stage.addChild(lab);
			
			labCurrentTime = new Label();
			labCurrentTime.move(10, 26);
			stage.addChild(labCurrentTime);
			
			labTotalTime = new Label();
			labTotalTime.move(480, 26);
			stage.addChild(labTotalTime);
		}
		
		/**
		 * ...........................
		 * 初始化按钮
		 */
		public function btn_Init():void
		{
			playBtn = new Button();
			playBtn.label = "暂停";
			playBtn.move(10, 100);
			playBtn.width = 60;
			stage.addChild(playBtn);
			playBtn.addEventListener(MouseEvent.CLICK,playBtnClick);
			
			stopBtn = new Button();
			stopBtn.label = "停止";
			stopBtn.move(90, 100);
			stopBtn.width = 60;
			stage.addChild(stopBtn);
			stopBtn.addEventListener(MouseEvent.CLICK,stopBtnClick);
		}
		/**
		 * ...........................
		 * 初始化音频音量控件
		 */
		public function sliderVolume_Init():void
		{
			sliderVolume= new Slider();
			sliderVolume.move(200, 100);
			sliderVolume.value = 1;//设置音量默认为1
			stage.addChild(sliderVolume);
			sliderVolume.addEventListener(SliderEvent.CHANGE,sliderVolumeChange);
		}
		
		/**
		 * ...........................
		 * 音频音量控件值改变事件
		 */
		public function sliderVolumeChange(e:SliderEvent):void
		{
			var transFrom:SoundTransform = new SoundTransform();
			transFrom.volume = sliderVolume.value;
			change.soundTransform = transFrom;
			trace("音量为---------------------------："+sliderVolume.value);
		}
		
		/**
		 * ...........................
		 * 播放暂停按钮点击事件
		 */
		public function playBtnClick(e:MouseEvent):void
		{
			play_tag = 1;
			if (playBtn.label == "播放")
			{
				change=sound.play(position);
				playBtn.label = "暂停";
			}
			else
			{
				change.stop();
				playBtn.label = "播放";
			}
		}
		
		/**
		 * ...........................
		 * 停止按钮点击事件
		 */
		public function stopBtnClick(e:MouseEvent):void
		{
			change.stop();
			position = 0;
			playBtn.label = "播放";
			play_tag = 0;
		}
		
		/**
		 * ...........................
		 * 设置播放时间和音频总时间显示
		 */
		public function getStrTime(num:int):String
		{
			var minutes:int;//分钟
			var seconds:int;//秒
			var minStr:String;//字符窜分钟
			var secStr:String;//字符窜秒
			minutes = Math.round(Math.round(num / 1000) / 60);
			seconds = Math.round(Math.round(num / 1000) % 60);
			minStr =minutes.toString();
			if (minutes < 10)
			{
				minStr = "0" + minutes;
			}
			secStr = seconds.toString();
			if (seconds < 10)
			{
				secStr = "0" + seconds;
			}
			return minStr + ":" + secStr;
		}
		
		/**
		 * ...........................
		 * 侦听事件
		 */
		public function enterFrameHandler(e:Event):void
		{
			//设置进度条的宽度和高度
			var barWidth:int = 500;
			var barHeight:int = 15;
			
			//已经加载字节
			var loaded:int = sound.bytesLoaded;
			//总字节
			var total:int = sound.bytesTotal;
			
			//获取音频总大小
			var length:int = sound.length;//当前加载声音的长度
			trace("length前:" + length);
			
			//绘制进度条
			graphics.clear();
			graphics.beginFill(0x000000);
			graphics.drawRect(10, 10, barWidth, barHeight);
			graphics.endFill();
			
			if (total > 0)
			{
				//加载进度
				var precentBuffered:Number = loaded / total;
				
				//绘制加载进度条
				graphics.beginFill(0xcccccc);
				graphics.drawRect(10, 10, barWidth * precentBuffered, barHeight)
				graphics.endFill();
				
				if (play_tag == 1)
				{
					//获取当前播放位置
					position = change.position;
					trace("position:" + position);
					
					//设置音频总大小
					length /= precentBuffered;
					trace("length后:" + length);
					
					//获取播放比例
					var barpos:Number = position / length;
					
					//绘制播放进度条
					graphics.beginFill(0x666666);
					graphics.drawRect(10, 10, barWidth * barpos, barHeight);
					graphics.endFill();
					
					lab.text = "播放进度：" + barpos * 100 + "%";
				}
				//设置播放时间和音频总时间显示
				labCurrentTime.text = getStrTime(position);
				labTotalTime.text = getStrTime(length);
				
				trace("加载进度为：" + Math.round(precentBuffered * 100) + "%");
				trace("play_tag:......................"+play_tag);
				
			}
		}
	}
	
}