C#获取mp3 Tag信息

王朝学院·作者佚名  2009-06-22
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//Foxer_Player_App_Author: CT.ThEN

//Foxer_Player_App_BuildTime: Otc,12,2008

//Foxer_Player_App_Version: 1.01

//Foxer_Player_App_Author_email: ctthen@126.com

//Foxer_Player_mp3Info:get_mp3Info

using System;

using System.Collections.Generic;

using System.Text;

using System.IO;

namespace Foxer_Player_1._1

{

public struct Mp3Info

{

public string identify; //TAG,三个字节

public string Title; //歌曲名,30个字节

public string Artist; //歌手名,30个字节

public string Album; //所属唱片,30个字节

public string Year; //年,4个字符

public string Comment; //注释,28个字节

public char reserved1; //保留位,一个字节

public char reserved2; //保留位,一个字节

public char reserved3; //保留位,一个字节

}

/// <summary>

/// Mp3文件信息类

/// </summary>

public class Mp3FileInfo

{

Mp3Info info;

/// <summary>

/// 构造函数,输入文件名即得到信息

/// </summary>

/// <param name="mp3FilePos"></param>

public Mp3FileInfo(String mp3FilePos)

{

info = getMp3Info(getLast128(mp3FilePos));

}

/// <summary>

/// 获取整理后的Mp3文件名,这里以标题和艺术家名定文件名

/// </summary>

/// <returns></returns>

public String GetOriginalName()

{

return formatString(info.Title.Trim()) + "-" + formatString(info.Artist.Trim());

}

/// <summary>

/// 去除\0字符

/// </summary>

/// <param name="str"></param>

/// <returns></returns>

private static String formatString(String str)

{

return str.Replace("\0", "");

}

/// <summary>

/// 获取MP3文件最后128个字节

/// </summary>

/// <param name="FileName">文件名</param>

/// <returns>返回字节数组</returns>

public static byte[] getLast128(string FileName)

{

FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read);

Stream stream = fs;

stream.Seek(-128, SeekOrigin.End);

const int seekPos = 128;

int rl = 0;

byte[] Info = new byte[seekPos];

rl = stream.Read(Info, 0, seekPos);

fs.Close();

stream.Close();

return Info;

}

/// <summary>

/// 获取MP3歌曲的相关信息

/// </summary>

/// <param name = "Info">从MP3文件中截取的二进制信息</param>

/// <returns>返回一个Mp3Info结构</returns>

public static Mp3Info getMp3Info(byte[] Info)

{

Mp3Info mp3Info = new Mp3Info();

string str = null;

int i;

int position = 0;//循环的起始值

int currentIndex = 0;//Info的当前索引值

//获取TAG标识

for (i = currentIndex; i < currentIndex + 3; i++)

{

str = str + (char)Info[i];

position++;

}

currentIndex = position;

mp3Info.identify = str;

//获取歌名

str = null;

byte[] bytTitle = new byte[30];//将歌名部分读到一个单独的数组中

int j = 0;

for (i = currentIndex; i < currentIndex + 30; i++)

{

bytTitle[j] = Info[i];

position++;

j++;

}

currentIndex = position;

mp3Info.Title = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytTitle);

//获取歌手名

str = null;

j = 0;

byte[] bytArtist = new byte[30];//将歌手名部分读到一个单独的数组中

for (i = currentIndex; i < currentIndex + 30; i++)

{

bytArtist[j] = Info[i];

position++;

j++;

}

currentIndex = position;

mp3Info.Artist = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytArtist);

//获取唱片名

str = null;

j = 0;

byte[] bytAlbum = new byte[30];//将唱片名部分读到一个单独的数组中

for (i = currentIndex; i < currentIndex + 30; i++)

{

bytAlbum[j] = Info[i];

position++;

j++;

}

currentIndex = position;

mp3Info.Album = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytAlbum);

//获取年

str = null;

j = 0;

byte[] bytYear = new byte[4];//将年部分读到一个单独的数组中

for (i = currentIndex; i < currentIndex + 4; i++)

{

bytYear[j] = Info[i];

position++;

j++;

}

currentIndex = position;

mp3Info.Year = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytYear);

//获取注释

str = null;

j = 0;

byte[] bytComment = new byte[28];//将注释部分读到一个单独的数组中

for (i = currentIndex; i < currentIndex + 25; i++)

{

bytComment[j] = Info[i];

position++;

j++;

}

currentIndex = position;

mp3Info.Comment = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytComment);

//以下获取保留位

mp3Info.reserved1 = (char)Info[++position];

mp3Info.reserved2 = (char)Info[++position];

mp3Info.reserved3 = (char)Info[++position];

return mp3Info;

}

/// <summary>

/// 将字节数组转换成字符串

/// </summary>

/// <param name = "b">字节数组</param>

/// <returns>返回转换后的字符串</returns>

public static string byteToString(byte[] b)

{

Encoding enc = Encoding.GetEncoding("GB2312");

string str = enc.GetString(b);

str = str.Substring(0, str.IndexOf("#CONTENT#") >= 0 ? str.IndexOf("#CONTENT#") : str.Length);//去掉无用字符

return str;

}

}

} 出处:http://blog.csdn.net/ctthen/archive/2009/06/19/4284194.aspx

 
 
 
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