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);

				

			}

		}

	}

	

}