C#獲取mp3 Tag信息

2019-11-17 04:12:38

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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: [email protected]
//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，三個字節
        public string Title;        //歌曲名,30個字節
        public string Artist;       //歌手名,30個字節
        public string Album;        //所屬唱片,30個字節
        public string Year;         //年,4個字符
        public string Comment;      //注釋,28個字節
        public char reserved1;      //保留位，一個字節
        public char reserved2;      //保留位，一個字節
        public char reserved3;      //保留位，一個字節
    }
    /// <summary>
    /// Mp3文件信息類
    /// </summary>
    public class Mp3FileInfo
    {
        Mp3Info info;
        /// <summary>
        /// 構造函數,輸入文件名即得到信息
        /// </summary>
        /// <param name="mp3FilePos"></param>
        public Mp3FileInfo(String mp3FilePos)
        {
            info = getMp3Info(getLast128(mp3FilePos));
        }
        /// <summary>
        /// 獲取整理后的Mp3文件名,這里以標題和藝術家名定文件名
        /// </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>
        /// 獲取MP3文件最后128個字節
        /// </summary>
        /// <param name="FileName">文件名</param>
        /// <returns>返回字節數組</returns>
        public static byte[] getLast128(string FileName)
        {
            FileStream fs = new FileStream(FileName, FileMode.Open, File access.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>
        /// 獲取MP3歌曲的相關信息
        /// </summary>
        /// <param name = "Info">從MP3文件中截取的二進制信息</param>
        /// <returns>返回一個Mp3Info結構</returns>
        public static Mp3Info getMp3Info(byte[] Info)
        {
            Mp3Info mp3Info = new Mp3Info();
            string str = null;
            int i;
            int position = 0;//循環的起始值
            int currentIndex = 0;//Info的當前索引值
            //獲取TAG標識
            for (i = currentIndex; i < currentIndex + 3; i++)
            {
                str = str + (char)Info[i];
                position++;
            }
            currentIndex = position;
            mp3Info.identify = str;

            //獲取歌名
            str = null;
            byte[] bytTitle = new byte[30];//將歌名部分讀到一個單獨的數組中
            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);

            //獲取歌手名
            str = null;
            j = 0;
            byte[] bytArtist = new byte[30];//將歌手名部分讀到一個單獨的數組中
            for (i = currentIndex; i < currentIndex + 30; i++)
            {
                bytArtist[j] = Info[i];
                position++;
                j++;
            }
            currentIndex = position;
            mp3Info.Artist = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytArtist);

            //獲取唱片名
            str = null;
            j = 0;
            byte[] bytAlbum = new byte[30];//將唱片名部分讀到一個單獨的數組中
            for (i = currentIndex; i < currentIndex + 30; i++)
            {
                bytAlbum[j] = Info[i];
                position++;
                j++;
            }
            currentIndex = position;
            mp3Info.Album = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytAlbum);

            //獲取年
            str = null;
            j = 0;
            byte[] bytYear = new byte[4];//將年部分讀到一個單獨的數組中
            for (i = currentIndex; i < currentIndex + 4; i++)
            {
                bytYear[j] = Info[i];
                position++;
                j++;
            }
            currentIndex = position;
            mp3Info.Year = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytYear);
            //獲取注釋
            str = null;
            j = 0;
            byte[] bytComment = new byte[28];//將注釋部分讀到一個單獨的數組中
            for (i = currentIndex; i < currentIndex + 25; i++)
            {
                bytComment[j] = Info[i];
                position++;
                j++;
            }
            currentIndex = position;
            mp3Info.Comment = Foxer_Player_1._1.Mp3FileInfo.byteToString(bytComment);

            //以下獲取保留位
            mp3Info.reserved1 = (char)Info[++position];
            mp3Info.reserved2 = (char)Info[++position];
            mp3Info.reserved3 = (char)Info[++position];
            return mp3Info;
        }
        /// <summary>
        /// 將字節數組轉換成字符串
        /// </summary>
        /// <param name = "b">字節數組</param>
        /// <returns>返回轉換后的字符串</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);//去掉無用字符
            return str;
        }
    }
} 出處：http://blog.csdn.net/ctthen/archive/2009/06/19/4284194.aspx

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