获取MP3歌曲信息 歌曲名 歌手名 专辑等

/// <summary>
/// 定义结构，存放mp3信息
/// </summary>
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>
/// 取出mp3的最后128字节的信息
/// </summary>
/// <param name="filename"></param>
/// <returns></returns>
private byte[] getsonginfo(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>
private 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 = this.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 = this.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 = this.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 = this.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 = this.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>
private string byteToString(byte[] b)
{
Encoding enc = Encoding.GetEncoding("GB2312");
string str = enc.GetString(b);
str = str.Substring(0, str.IndexOf('\0') >= 0 ? str.IndexOf('\0') : str.Length);//去掉无用字符
return str;
}
/// <summary>
/// 更改文件名
/// </summary>
/// <param name="filePath">文件名</param>
/// <returns></returns>
private string ReName(string filePath)
{
if (File.Exists(filePath))
{
try
{
Mp3Info mp3Info = new Mp3Info();
mp3Info = this.getMp3Info(this.getsonginfo(filePath));//读出文件信息
if (mp3Info.Title.Trim().Length == 0)
{
mp3Info.Title = "未知名歌曲";//这段我自己修改过，当歌曲名信息为空时，显示未知名歌曲，而后再显示文件名
}
return mp3Info.Title.ToString();
}
catch (Exception)
{
return "";
}
}
else
{
return "";
}
}