C#实现获取mp3 Tag信息的方法

本文实例讲述了c#实现获取mp3 tag信息的方法。分享给大家供大家参考，具体如下：

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;
    }
  }
}

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