Flex播放器(实现播放、缓冲进度条和音频曲线显示

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Flex播放器(实现播放、缓冲进度条和音频曲线显示

来源:互联网 作者:脚本宝典 时间:2015-06-23 18:46 【

一时兴起,玩起了Flex,本来还想要做个Flex博客,不过目前还只能在里面树个公告。。。没办法做完啊,河蟹的个杯具的!Flex布局不像是CSS,精美Flash动画不是拖一个两个控件就能做出

一时兴起,玩起了Flex,本来还想要做个Flex博客,不过目前还只能在里面树个公告。。。没办法做完啊,河蟹的个杯具的!Flex布局不像是CSS,精美Flash动画不是拖一个两个控件就能做出来滴,而是一笔一条线绘制出来滴!这些我都还不熟悉,所有折腾快一个星期了,每天都是搞到头大才睡觉,今天终于能出一个简单的播放器。

一直很喜欢音乐这个东西,喜欢Jay,更喜欢他的歌,也很崇拜小猪,他的一段灰色空间曾让我激流奋进,想过自己能做个播客放自己喜欢听的歌曲,出于自恋那样会更有一点点满足感。呃~走神了,前二天无意看到一群教师的个人博客,深深的被他们的博文所吸引,无论是谈技术还是记录生活的,写得都是那么的真切,还有坚持每日一博的,坚持不放弃...

mx:ProgressBar实现加载歌曲缓冲进度条

ProgressBar有三大mode模式,分别为event、manual、polled,event为基于事件驱动模式,可设置source对象自动显示加载进程;manual为手动模式,需要调用ProgressBar.setProgress()方法设置滚动条进度;polled为轮询模式,本例使用的manual模式,Sound加载load请求歌曲添加一个ProgressEvent.PROGRESS处理中监听事件,然后根据Sound已加载的bytes和bytesTotal数,设置setProgress进度。这里需要注意在切换歌曲的时候先要移除ProgressEvent.PROGRESS事件,否则之前播放歌曲还未加载完又切换load新歌曲时回出现ProgressBar触发多个PROGRESS事件被设置进度出现来回滚动的问题。

mx:HSlide调节滑秆

这个控件在本例中2处使用,实现对播放进度和声音大小的控制。最一开始调整播放进度的问题难倒了我很久,因为在歌曲播放过程中HSlide要自动滑动当前播放位置,同时又需要能手动拖动播放位置,HSlide本来有一个很好的change事件用来侦听改变,但是我使用定时器设置HSlide的value的时竟然也给我触发change事件,参考了Adobe哥官网的帮助文档,说是Slider 组件的值因鼠标或键盘交互操作而改变时调度,如果 liveDragging 属性是 true,则在用户移动滑块时持续调度该事件。 如果 liveDragging 是 false,则在用户释放滑块时调度该事件。但是无论我怎么设置,在代码里改变了HSlide的value值怎会触发change事件,不是说在用户交互操作而改变时调度吗?无赖啊,后来只能折中采取监听thumbDrag滑秆拖动时事件,这个事件Adobe哥的解释是当按下滑块并随后随鼠标移动时调度,这样会有一个小问题,就是需要拖动滑秆按下时才会触发,点击无效。

SoundMixer.computeSpectrum()分析音频曲线

本例你看到显示的音频曲线其实是右64个绘制成条状的Canvas控件排列而成,然后使用定时器每间隔100毫秒重新设置他们的scaleY位置以呈现出变幻曲线的效果,代码只有三行很简单,具体可参见我下面源码给出的timerTick事件。这里为什么要用定时器呢?在网上看别人是监听Event.ENTER_FRAME事件重绘音频曲线的,不想搞那么麻烦就直接用定时器了,随便根据bytesTotal和bytesLoaded计算下歌曲播放时间,使用100毫秒的定时器也并好耗站资源,CPU没有涨很高。

效果图:

mxml代码如下:

 

复制代码代码如下:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" verticalGap="0" scroll="false" backgroundAlpha="0"
     horizontalScrollPolicy="off" verticalScrollPolicy="off" verticalAlign="middle" horizontalAlign="center"
     initialize="init(event)" layout="vertical" fontSize="14" paddingLeft="0" paddingTop="0" paddingRight="0" paddingBottom="0" >
    <mx:Script>
        <![CDATA[
            import mx.formatters.DateFormatter;
        
            import mx.effects.SoundEffect;
            import mx.events.SliderEvent;
            import mx.core.SoundAsset;
        
            import mx.controls.Alert;
            import mx.managers.CursorManager;
            import flash.media.*;
            
            import flash.utils.Timer;
            
            [Embed(source="images/cursor.gif")] 
            private var cursorHand : Class;//图标
            
            private var xml:XML; 
            private var xmlPath:String = "/flex/bin-debug/song.xml";
            private var currIndex : Number = 0; 
            
            private var song :Sound;
            private var channel :SoundChannel;
            private var position : Number = 0;

 

            // 保存 512 个声音波形的快照
            private var bytes:ByteArray = new ByteArray();
            // SoundBar 的个数
            private var barNum:uint = 64;
            // 保存所有 SoundBar 的引用
            private var soundBars:Array = new Array();
            
            //定时器
            private var timer : Timer;
            
            //Application的initialize初试化事件
            private function init(event:Event):void
            {
                var loader:URLLoader = new URLLoader(); 
                loader.load(new URLRequest(xmlPath)); 
                loader.addEventListener(Event.COMPLETE,Xml_Complete);
                
                timer = new Timer(100);
                timer.addEventListener(TimerEvent.TIMER,timerTick);
                
                var barWidth:Number = boxSoundBar.width*1.00/barNum;
                // 初始化Canvas为音频条,放入舞台并加入数组
                for (var i:uint = 0; i < barNum; i++)  {
                   var soundBar:Canvas = new Canvas();
                   soundBar.width = barWidth;
                   soundBar.height = boxSoundBar.height;
                   soundBar.x = i * barWidth;
                      soundBar.y =  0;

                   var g:Graphics = soundBar.graphics;
                   g.lineStyle(1,0x6688AA,1);
                   g.beginGradientFill(GradientType.RADIAL,[0x33cc00,0x456628],[1,1],[0,255],null,SpreadMethod.REFLECT,InterpolationMethod.RGB,0);
                   g.drawRect(0,0,soundBar.width,soundBar.height);
                   g.endFill();
                   boxSoundBar.addChild(soundBar);
                   soundBars.push(soundBar);
                }

                // 隐藏一些内建的鼠标右键菜单项
                this.contextMenu.hideBuiltInItems(); 
                var contextMenuItem : ContextMenuItem = new ContextMenuItem("Powered By: Jonllen");
                contextMenuItem.enabled = false;
                contextMenu.customItems.push(contextMenuItem);
                this.contextMenu.customItems.push(contextMenuItem);
                
                //更改鼠标图标
                CursorManager.setCursor(cursorHand);
            }
            
            //读取XML文件完成事件
            private function Xml_Complete(event:Event):void 
            {
                xml = new XML(event.target.data);
                if(xml.item.length()>=1)
                {
                    listSong.dataProvider= xml.item.name;
                    listSong.selectedIndex = 0;
                    //手动触发List的Change事件
                    listSong.dispatchEvent(new mx.events.ListEvent(Event.CHANGE, true, false));
                }
            }
            
            //List选择歌曲改变事件
            private function Xml_Change(event:Event):void
            {
                currIndex = event.target.selectedIndex;
                
                timer.stop();
                
                //停止声音文件的加载
                if( song!=null )
                {
                    //移除之前加载PROGRESS事件对songProgress进度条的控制
                    song.removeEventListener(ProgressEvent.PROGRESS,songProgress_Change);
                    if( song.isBuffering )
                        song.close();
                }
                
                song = new Sound();
                var url : String = xml.item[currIndex].url;
                var source:URLRequest = new URLRequest(url);
                song.load(source);
                song.addEventListener(ProgressEvent.PROGRESS, songProgress_Change);
                song.addEventListener(IOErrorEvent.IO_ERROR, songProgress_Error);
                
                position = 0;
                songStart();
            }
            
            //歌曲播放完成
            private function songProgress_Complete(e:Event):void {
                if(currIndex == xml.item.length()-1) {
                    currIndex = 0;
                }else {
                    currIndex++;
                }
                listSong.selectedIndex = currIndex;
                listSong.dispatchEvent(new mx.events.ListEvent(Event.CHANGE, true, false));
            }
            
            //加载歌曲失败
            private function songProgress_Error(e:IOErrorEvent):void {
                Alert.show("文件不存在!","系统提示");
            }
            
            //开始播放歌曲
            private function songStart():void {
                
                if ( channel != null ){
                    channel.stop();
                }
                
                lblName.text = xml.item[currIndex].name;
                channel = song.play(position,int.MAX_VALUE);
                
                var length :Number = song.length*song.bytesTotal/song.bytesLoaded;
                var date : Date = new Date();
                date.time = length;                
                var dt : DateFormatter = new DateFormatter();
                dt.formatString="NN:SS";
                var totalTime : String = dt.format(date);
                
                date.time = channel.position;
                lblTime.text = dt.format(date) + " | " + totalTime;
                lblStatus.text = "播放";
                
                var soundcontrol : SoundTransform = channel.soundTransform;
                soundcontrol.volume = volumeSlider.value;
                channel.soundTransform= soundcontrol;
                
                timer.start();
                boxSoundBar.visible = true;
            }
            
            //停止歌曲播放
            private function songStop():void {
                timer.stop();
                position = 0;
                boxSoundBar.visible = false;
                lblTime.text = "00:00 |"+lblTime.text.split("|")[1];
                lblStatus.text = "停止";
                songSlider.value = songSlider.minimum;
                songProgress.setProgress(songProgress.minimum,songProgress.maximum);
                if ( channel != null )
                {
                    channel.stop();
                }
            }
            
            //暂停歌曲播放
            private function songPause():void {
                if ( channel != null ){
                    timer.stop();
                    position = channel.position;
                    channel.stop();
                    lblStatus.text = "暂停";
                }
            }
            
            //加载歌曲进度条显示
            private function songProgress_Change(e:ProgressEvent):void {
                var percent:int = Math.round(e.bytesLoaded * 100 / e.bytesTotal);
                songProgress.setProgress(e.bytesLoaded,e.bytesTotal);
            }
            
            //定时器方法
            private function timerTick( e:TimerEvent):void {
                
                if( channel!=null) {
                    
                    var length :Number = song.length*song.bytesTotal/song.bytesLoaded;
                    var date : Date = new Date();
                    date.time = length;                
                    var dt : DateFormatter = new DateFormatter();
                    dt.formatString="NN:SS";
                    var totalTime : String = dt.format(date);
                    
                    date.time = channel.position;
                    lblTime.text = dt.format(date) + " | " + totalTime;
                    
                    songSlider.value=100*channel.position/length;
                    if( songSlider.value>=songSlider.maximum){
                        timer.stop();
                        songProgress_Complete(null);
                        return;
                    }
                    
                    SoundMixer.computeSpectrum(bytes, false, 0);
                    for (var i:uint = 0; i < barNum; i++)  {
                       soundBars[i].scaleY = bytes.readFloat();
                    }
                    
                }
            }
            
            //歌曲进度调整事件
            internal function songSlider_Change(e:SliderEvent):void{
                timer.stop();
                if ( channel != null ){
                    var length :Number = song.length*song.bytesTotal/song.bytesLoaded;
                    position = e.value*length/100;
                    songStart();
                }
            }
            
            //声音大小调整事件
            internal function changeVolume(evt:SliderEvent):void{
                if ( channel != null ){
                    var soundcontrol : SoundTransform = channel.soundTransform;
                    soundcontrol.volume = evt.value;
                    channel.soundTransform= soundcontrol;
                }
            }
            
            //设置歌曲播放时间和总时间
            private function setTimeStatus():void {
                var length :Number = song.length*song.bytesTotal/song.bytesLoaded;
                var date : Date = new Date();
                date.time = length;                
                var dt : DateFormatter = new DateFormatter();
                dt.formatString="NN:SS";
                var totalTime : String = dt.format(date);
                
                date.time = channel.position;
                lblTime.text = dt.format(date) + " | " + totalTime;
            }
            
        ]]>
    </mx:Script>
    <mx:HBox width="100%" verticalGap="0" verticalAlign="middle" horizontalAlign="center">
        <mx:Canvas width="440" borderColor="#CCCCCC" borderStyle="solid" height="171">
            <mx:Label id="lblName" x="5" fontSize="18" y="10" text=""/>
            <mx:HBox id="boxSoundBar" horizontalGap="0" verticalAlign="middle"
                 width="192" height="50" x="5" y="39" visible="false"></mx:HBox>
            <mx:ProgressBar id="songProgress" label="" 
                width="290" height="3" mode="manual" textAlign="left" 
                labelPlacement="center" fontSize="3" x="10" y="97" 
                minimum="0" maximum="100" barColor="yellow"
                trackColors="[white, haloSilver]"/>
            <mx:HSlider id="songSlider" styleName="song" value="0"
                 showTrackHighlight="true" x="5" y="85" thumbDrag="songSlider_Change(event)"
                 width="300" height="22" minimum="0" maximum="100" 
                 liveDragging="false" snapInterval="1"  toolTip="拖动调整播放进度">
            </mx:HSlider>
            <mx:Label id="lblStatus" x="243" y="41" text=""/>
            <mx:Label id="lblTime" x="205" y="66" text="00:00 | 5:23"/>
            <mx:Button x="10" y="124" label="Play" click="songStart()"/>
            <mx:Button x="74" y="124" label="Pause" click="songPause()"/>
            <mx:Button x="152" y="124" label="Stop" click="songStop()"/>
            <mx:HSlider id="volumeSlider" styleName="volume" change="changeVolume(event)"
                 showTrackHighlight="true" value="0.5" x="222" y="133"
                  width="81" minimum="0" maximum="10" liveDragging="true"
                   snapInterval="0.1" toolTip="音量调节" />
            <mx:Label x="308" fontSize="18" y="10" text="歌曲列表"/>
            <mx:List id="listSong" alpha="0.25" x="308" y="43" height="116"
                 change="Xml_Change(event)" width="130" toolTip="点击选择歌曲"></mx:List>
        </mx:Canvas>
    </mx:HBox>
</mx:Application>


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