题外话:个别朋友总是问我同样的问题，做为一名c#/silverlight程序员为啥还要学flash ?
回 答:看日本片时，就不能对照看欧美的么? 不体会日本的细腻，又怎能感觉到欧美的粗放；同样都是web相关的技术，不必报门户之见；何况这二者有很多可以相互借鉴的东西。
注：这个例子来自[FL车在臣](在blueidea上又名“寂寞火山”)翻译的“Animation in ActionScript3.0”一书,下面的原理分析也来自他的思路
原 理：
1.先分析一下lyc的格式：
[ti:Going Home]
[ar:Sophie Zelmani]
[al:]
[by:yitian1977]
[offset:500]
[00:01.52]Going Home
[00:06.66]Sophie Zelmani
[00:11.32]
[00:36.60]Not very often have we met /
[00:42.94]But the music's been too bad
[00:48.92]Can only sense happiness
[00:55.68]if the music is sad
[00:59.34]
[01:00.29]So, I'm going home
[01:06.30]I must hurry home
[01:11.88]Where a life goes on
[01:16.05]
[01:20.14]We're too old to make a mess
[01:26.16]Dreams will keep me young
[01:32.78]Old enough to stress
[01:38.86]Only mirrors tell the time
[01:41.76]
[02:52.99][01:42.80]So, I'm going home
[02:59.19][01:48.91]I must hurry home
[03:05.33][01:55.04]So will my life go on
[03:09.29][02:00.56]
[03:17.40][02:07.45]Yes, I'm going home
[03:23.70][02:13.43]Going home alone
[03:29.80][02:19.77]And your life goes on
[03:40.16][02:34.09]
[04:05.13][03:52.01](edit by Nathan_na@msn.com)
基本上就是： [时:分.秒](一个或多个) + 本句歌词
2.不管是Flash还是Silverlight，在播放声音时，都可以得到播放进度:即当前播放到了第多少(豪)秒
3.看懂了第1,2点的分析后，可以这么干：
创建一个全局数组(或字典对象，反正只要能满足key-value结构就行)，key为该句歌词对应的(豪)秒数，而value即为对应的歌词，然后将其按key(即歌词出现的时间)升序排序
注：对于"[02:52.99][01:42.80]So, I'm going home"这种写法的歌词，在数组中要拆分成二条，即相当于：
[02:52.99]So, I'm going home
[01:42.80]So, I'm going home
播放时，根据当前播放的时间进度，找到对应的数组元素，然后显示
Flash版：
As3代码
package {
import flash.display.Sprite;
import flash.net.URLRequest;
import flash.net.URLLoader;
import flash.media.Sound;
import flash.media.SoundChannel;
import flash.events.Event;
import flash.text.TextField;
import flash.system.System;
import flash.text.TextFieldAutoSize;
import flash.events.MouseEvent;
public class LycPlayer extends Sprite {
var lrc_txt:TextField=new TextField();
var LRCarray:Array=new Array();//全局数组
var sc:SoundChannel;
var sound:Sound;
public function LycPlayer() {
//定位歌词显示文本框
lrc_txt.width=500;
lrc_txt.selectable=false;
lrc_txt.autoSize=TextFieldAutoSize.CENTER;
lrc_txt.x=stage.stageWidth/2-lrc_txt.width/2;
lrc_txt.y=0;
addChild(lrc_txt);
//加载歌词
var loader:URLLoader=new URLLoader();
loader.load(new URLRequest("http://images.24city.com/jimmy/flash/LycPlayer/lyc/GoingHome.txt"));
loader.addEventListener(Event.COMPLETE,LoadFinish);
//加载mp3
sound=new Sound();
sound.load(new URLRequest("http://www.apple520.com/templates/default/images/new/3.mp3"));
//开始播放
sc=sound.play();
//监听Enter_Frame事件
stage.addEventListener(Event.ENTER_FRAME,SoundPlaying);
btnStop.addEventListener(MouseEvent.MOUSE_DOWN,StopMouseDownHandler);
btnPlay.addEventListener(MouseEvent.MOUSE_DOWN,PlayMouseDownHandler);
}
function StopMouseDownHandler(e:MouseEvent) {
if (sc!=null){
sc.stop();
sc = null;
}
}
function PlayMouseDownHandler(e:MouseEvent) {
if (sc==null){
sc = sound.play();
}
}
function SoundPlaying(evt:Event):void {
if (sc==null){return;}
//trace(sc.position);
for (var i:uint=2,j:uint=LRCarray.length-1; i <j; i++) {
if (sc.position<LRCarray[i].timer) {
lrc_txt.text=" "+LRCarray[i-2].lyric+"\n→"+LRCarray[i-1].lyric+"\n "+LRCarray[i].lyric;
break;
}
lrc_txt.text=LRCarray[LRCarray.length-1].lyric;
}
}
function LoadFinish(evt:Event):void {
var list:String=evt.target.data;
var listarray:Array=list.split("\r\n");
//分析歌词，填充到全局歌词数组中
var reg:RegExp=/\[[0-5][0-9]:[0-5][0-9].[0-9][0-9]\]/g;
for (var i:uint=1,j:uint=listarray.length; i <j; i++) {
var info:String=listarray[i];
var len:int=info.match(reg).length;
var timeAry:Array=info.match(reg);
var lyric:String=info.substr(len*10);
if (lyric.length<=0) {
continue;
}
for (var k:uint=0,t:uint=timeAry.length; k < t; k++) {
var obj:Object = new Object();
var ctime:String=timeAry[k];
var ntime:uint = 1000 * (parseInt(ctime.substr(1,2),10)*60 + parseInt(ctime.substr(4,5),10)) + parseInt(ctime.substr(7,8),10);
obj.timer=ntime;
obj.lyric=lyric;
LRCarray.push(obj);
}
}
//数组排序
LRCarray.sort(compare);
var objFirst:Object = new Object();
objFirst.timer=1;
objFirst.lyric="Loading...";
LRCarray.unshift(objFirst);
var objLast:Object = new Object();
objLast.timer=999999;
objLast.lyric="the end.";
LRCarray.push(objLast);
for (var m:Number=0,n =LRCarray.length; m<n; m++) {
trace(LRCarray[m].timer + "\t" + LRCarray[m].lyric);
}
}
//数组排序辅助方法
private function compare(paraA:Object,paraB:Object):int {
if (paraA.timer>paraB.timer) {
return 1;
}
if (paraA.timer<paraB.timer) {
return -1;
}
return 0;
}
}
}
Silverlight版：
Xaml部分：
Xaml代码
<UserControl x:Class="SilverlightLyricPlayer.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="60" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White">
<TextBlock x:Name="txtLyc" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>
<StackPanel Orientation="Horizontal" Height="20" HorizontalAlignment="Right" Margin="0,0,10,0">
<Button x:Name="btnPlay" Width="40" Margin="5,0,5,0" Content="Play" Click="btnPlay_Click"></Button>
<Button x:Name="btnStop" Width="40" Content="Stop" Click="btnStop_Click"></Button>
</StackPanel>
<MediaElement AutoPlay="True" x:Name="mePlayer" Visibility="Collapsed" />
</Grid>
</UserControl>
cs部分：
Xaml.CS代码
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Browser;
using System.Windows.Controls;
using System.Windows.Media;
namespace SilverlightLyricPlayer
{
public partial class MainPage : UserControl
{
List<KeyValuePair<int, string>> lstLycs;
public MainPage()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(MainPage_Loaded);
}
void MainPage_Loaded(object sender, RoutedEventArgs e)
{
lstLycs = new List<KeyValuePair<int, string>>();
WebClient _wcLyc = new WebClient();
Uri _uriLyc = new Uri(HtmlPage.Document.DocumentUri, "http://images.24city.com/jimmy/flash/LycPlayer/lyc/GoingHome.txt");
_wcLyc.OpenReadCompleted += new OpenReadCompletedEventHandler(wcLyc_OpenReadCompleted);
_wcLyc.OpenReadAsync(_uriLyc);
}
void wcLyc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
if (e.Error == null)
{
Dictionary<int, string> dicLyc = new Dictionary<int, string>();
StreamReader _srReader = new StreamReader(e.Result);
string _strlyc = _srReader.ReadToEnd().Replace(Environment.NewLine, "\n");
string[] _arrTemp = _strlyc.Split('\n');
Regex _reg = new Regex("\\[[0-5][0-9]:[0-5][0-9].[0-9][0-9]\\]");
int _key = -1;
string _lyc = "";
foreach (string item in _arrTemp)
{
MatchCollection _mc = _reg.Matches(item);
foreach (Match m in _mc)
{
_key = 1000 * (int.Parse(m.Value.Substring(1, 2)) * 60 + int.Parse(m.Value.Substring(4, 2))) + int.Parse(m.Value.Substring(7, 2));//将时间换成总毫秒数
_lyc = item.Substring(item.LastIndexOf(']') + 1);
if (!dicLyc.ContainsKey(_key) && _lyc.Length > 0)
{
dicLyc.Add(_key, _lyc);
}
}
}
dicLyc.Add(1, "Loading...");
dicLyc.Add(999999, "the end.");
lstLycs = dicLyc.OrderBy(c => c.Key).ToList();
foreach (var item in lstLycs)
{
Debug.WriteLine(item.Key + "\t" + item.Value);
}
mePlayer.Source = new Uri(HtmlPage.Document.DocumentUri, "http://www.apple520.com/templates/default/images/new/3.mp3");
mePlayer.Volume = 0.9;
mePlayer.Play();
CompositionTarget.Rendering += new EventHandler(CompositionTarget_Rendering);//相当于As3.0中的addEventListener(Enter.ENTER_FRAME,EnterFrameHandler);
}
}
void CompositionTarget_Rendering(object sender, EventArgs e)
{
for (int i = 2; i < lstLycs.Count-1; i++)
{
if (mePlayer.Position.TotalMilliseconds < lstLycs[i].Key)
{
txtLyc.Text = " " + lstLycs[i - 2].Value + Environment.NewLine + "→" + lstLycs[i - 1].Value + Environment.NewLine + " " + lstLycs[i].Value;
break;
}
txtLyc.Text = lstLycs.Last().Value;
}
}
private void btnPlay_Click(object sender, RoutedEventArgs e)
{
mePlayer.Play();
}
private void btnStop_Click(object sender, RoutedEventArgs e)
{
mePlayer.Stop();
}
}
}
Silverlight演示地址：http://images.24city.com/jimmy/LycPlayer/ (安全沙箱原因，无法在播客园上正常播放，所以只能给出地址)
下载：示例源文件代码