首页 > 代码库 > MP3 信息读取

MP3 信息读取

MP3 信息读取

运行环境:Window7 64bit,.NetFramework4.61,C# 7.0; 编者:乌龙哈里 2017-03-13


参考:

  • MP3-wikipedia
  • ID3v1
  • MPEG Audio Layer I/II/III frame header
  • ID3 tag version 2.3.0
  • MP3文件格式解析

章节:

  • Mp3 文件结构概述
  • ID3V1 标记
  • ID3V2 标记
  • Mp3 数据头

正文:

一、Mp3文件概述

最近买了个车载mp3播放器,需要下载mp3文件。下载了一堆后发现,很多网上的mp3音质不怎么好,如何来分辨呢。只好研究mp3的文件格式。

从 wiki 上获知,mp3的文件基本有3部分组成:

ID3v2x 标记
MP3 音乐数据
ID3v1 标记

二、ID3v1 标记

Id3v1标记位于 mp3 文件末尾的128 byte,结构如下:

起始长度内容
03标记 Tag
330歌曲名 SongTitle
3330表演者 Artist
6330专辑 Album
934年份 Year
9730备注 Comment
1271歌曲类型 Genre

1、标记:
标记是以“TAG”3个大写字母为标记。

2、内容:
歌名、表演者、专辑、年份、备注都是以ASCII编码的字符

3、类型:
类型是1位数字,具体见 8.1. Appendix A - Genre List from ID3v1

三、ID3v2 标记

Id3v2 标记是放在mp3文件头,具体长度要通过计算才知道。结构分为两部分: Id3v2 Tag Header,Id3v2 Frame

1、Id3v2Tag Header:
这个头部放在mp3文件最前面,长 10byte,具体结构:

起始长度内容
03标志 Tag
32版本 version
51Flag
64Frame长度

标志是以“ID3”3个字符为标记;
版本为2个 byte的数字,前面1byte 一般为 03,表示id3v2.3版本,后面1byte的为小版本,一般为0;
Flag具体看ID3 tag version 2.3.0 ,一般为0;
Frame长度是指紧接着 10byte 长的头部数据后的id3v2tag Frame的长度,是4个byte的数字,每byte的二进制位中前面都为0,0xxxxxxxx,具体长度的算法用位计算为:

byte[] data=http://www.mamicode.com/new byte[10];
//....(从文件中读取前10byte数据放入 data)
int FrameLength=data[6] << 21 | data[7] << 14 | data[8] << 7 | data[9]

2、Tag Frame帧数据。
Tag Frame 是一个以10byte为头,后面不定长的数据帧,结构如下:

部分相对起始长度内容
04标记 Frame ID
54内容长度
82Flages
内容10不定长内容

FrameID 为4个字符,具体参考ID3 tag version 2.3.0;
内容长度为 4 byte的数据,和上面的不同,它的二进制是全8位的,但和 C# 存储int32不同,它前面的byte表示高位,具体计算如下:

byte[] data=http://www.mamicode.com/new byte[10];
//....(读取10byte Frame头部数据放入 data)
int ContentLength=data[6] << 24 | data[7] << 16 | data[8] << 8 | data[9]

(1)FrameId 以“T”开头的,除了“TXXX”,都是字符串信息,具体结构为:

起始长度内容
01Text encoding
1Frame头计算出来的长度内容

内容以 FF FE 开头的为 C# 里面的 Encoding.Unicode ,以 FE FF 开头的为 C# 里面的 Encoding.BigEndianUnicode;除上外是以 Ascii 编码的。

(2)FrameId为“APIC”的是放 jpeg 或 png 格式的图像数据,具体见4.15. Attached picture。

四、mp3音乐数据头

读完 id3v2tag 的数据后,紧接着下来就是具体的音乐数据。但是并不一定紧挨着 FrameLength+10,不知道是这些mp3录制的时候的软件问题还是其他我还没发现的问题,用ultraEdit看,音乐数据和 id3tag 中间还有一部分全都是0的数据,所以读完 id3v2tag 后还要一个字节一个字节的寻找 FF开头的数据。我只是需要知道mp3的音乐信息,所以只要在id3v2tag 后找到 FF 开头的4个字节的数据就成了。这4个字节全部都是用位来表示信息,具体见 MPEG Audio Layer I/II/III frame header 。

写了一个程序读写,尚未完全完成,效果如下图:

技术分享

附练手全程序:

技术分享
<Window x:Class="Mp3信息.MainWindow"        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"        xmlns:local="clr-namespace:Mp3信息"        mc:Ignorable="d"        Title="Mp3信息1.0  [乌龙哈里2017-03-13]" Height="650" Width="500">    <Grid>        <Grid.RowDefinitions>            <RowDefinition Height="32"/>            <RowDefinition Height="*"/>        </Grid.RowDefinitions>        <Grid Grid.Row="0">            <Grid.ColumnDefinitions>                <ColumnDefinition Width="1*"/>                <ColumnDefinition Width="6*"/>            </Grid.ColumnDefinitions>            <Button Name="btnFile" Content="Mp3" Margin="3" Grid.Column="0" Click="btnFile_Click"/>            <TextBox Name="txtFile" Grid.Column="1" Margin="3"/>        </Grid>                <TabControl Grid.Row="1">                        <TabItem Header="单曲">                <Grid >                    <Grid.RowDefinitions>                        <RowDefinition Height="*"/>                        <RowDefinition Height="200"/>                    </Grid.RowDefinitions>                    <Grid.ColumnDefinitions>                        <ColumnDefinition Width="200"/>                        <ColumnDefinition Width="*"/>                    </Grid.ColumnDefinitions>                    <DataGrid Name="dgShow" AutoGenerateColumns="False" SelectionUnit="CellOrRowHeader" Grid.Row="0" Grid.ColumnSpan="2">                        <DataGrid.Columns>                            <DataGridTextColumn Header="名称"  Binding="{Binding [0]}"/>                            <DataGridTextColumn Header="ID3V2"  Binding="{Binding [1]}"/>                            <DataGridTextColumn Header="ID3V1"  Binding="{Binding [2]}"/>                        </DataGrid.Columns>                    </DataGrid>                    <Image Name="imgCover" Grid.Row="1" Grid.Column="0"/>                    <Grid Grid.Row="1" Grid.Column="1">                        <Grid.ColumnDefinitions>                            <ColumnDefinition Width="1*"/>                            <ColumnDefinition Width="1*"/>                        </Grid.ColumnDefinitions>                        <Grid.RowDefinitions>                            <RowDefinition Height="32"/>                            <RowDefinition Height="*"/>                        </Grid.RowDefinitions>                        <Button Name="btnModify2" Content="修改 ID3V2" FontSize="18" Foreground="Navy" Grid.Row="1" Grid.Column="0" Margin="10" Click="btnModify2_Click"/>                        <ComboBox Name="cmbGenre" Margin="10,5,10,2" Grid.Row="0" Grid.Column="1" SelectionChanged="cmbGenre_SelectionChanged"/>                        <Button Name="btnModify1" Content="修改 ID3V1" FontSize="18" Grid.Row="1" Grid.Column="1" Margin="10" Click="btnModify1_Click"/>                    </Grid>                </Grid>            </TabItem>            <TabItem Header="批量">                <Grid>                    <Grid.RowDefinitions>                        <RowDefinition Height="40"/>                        <RowDefinition Height="*"/>                    </Grid.RowDefinitions>                    <Button Name="btnMuti" Content="批量读取" FontSize="16" Margin="5" Grid.Row="0"/>                    <DataGrid Name="dgMuti" Grid.Row="1">                        <DataGrid.Columns>                            <DataGridTextColumn Header="文件"  Binding="{Binding [0]}"/>                            <DataGridTextColumn Header="Mpeg"  Binding="{Binding [1]}"/>                            <DataGridTextColumn Header="Layer"  Binding="{Binding [2]}"/>                            <DataGridTextColumn Header="波特率"  Binding="{Binding [3]}"/>                            <DataGridTextColumn Header="频率"  Binding="{Binding [4]}"/>                            <DataGridTextColumn Header="声道"  Binding="{Binding [5]}"/>                        </DataGrid.Columns>                    </DataGrid>                </Grid>            </TabItem>        </TabControl>    </Grid></Window>
View Code
技术分享
using System.Windows;using System.Windows.Controls;namespace Mp3信息{    /// <summary>    /// MainWindow.xaml 的交互逻辑    /// </summary>    public partial class MainWindow : Window    {        private string filteStr = "MP3 File|*.mp3|All File|*.*";        private Mp3FileInfo mp3 = new Mp3FileInfo();        public MainWindow()        {            InitializeComponent();             dgShow.ItemsSource = mp3.Mp3Infos;            cmbGenre.ItemsSource = mp3.Genres;        }        //---打开文件按钮        private void btnFile_Click(object sender, RoutedEventArgs e)        {            string filename = GetOpenFilePath(filteStr);            if (!string.IsNullOrEmpty(filename))            {                txtFile.Text = filename;                dgShow.BeginEdit();                mp3.GetMp3Info(filename);                dgShow.EndInit();                if (mp3.CoverExist)                {                    imgCover.Source = mp3.CoverPicture;                }                cmbGenre.SelectedIndex =int.Parse(mp3.Mp3Infos[5][2]);            }        }       //---取得打开文件名        private string GetOpenFilePath(string filterstr)        {            var dlg = new Microsoft.Win32.OpenFileDialog();            dlg.Filter = filterstr;            if (dlg.ShowDialog() == true)            {                return dlg.FileName;            }            return "";        }        //---取得保存文件名        private string GetSaveFilePath(string filterstr)        {            var dlg = new Microsoft.Win32.SaveFileDialog();            //dlg.FileName = Path.GetFileNameWithoutExtension(memoFilePath);            //dlg.DefaultExt = ".memo";            dlg.Filter = filterstr;            if (dlg.ShowDialog() == true)            {                return dlg.FileName;            }            return "";        }        private void btnModify1_Click(object sender, RoutedEventArgs e)        {                mp3.SetV1TagInfo(txtFile.Text);        }        private void cmbGenre_SelectionChanged(object sender, SelectionChangedEventArgs e)        {            dgShow.BeginInit();            mp3.Mp3Infos[5][2] = cmbGenre.SelectedIndex.ToString();            dgShow.EndInit();        }        private void btnModify2_Click(object sender, RoutedEventArgs e)        {            mp3.SetV2TagInfo(txtFile.Text);        }    }}
View Code
技术分享
/****************************************************** * MP3 音乐格式文件信息读取 * 作者:乌龙哈里 * 最后修改:2017-03-07 * 参考: * 1、http://id3.org/d3v2.3.0 * 2、http://blog.csdn.net/alin0725/article/details/1876253 * 3、http://www.mpgedit.org/mpgedit/mpeg%5Fformat/MP3Format.html * 4、https://en.wikipedia.org/wiki/MP3 ******************************************************/namespace Mp3信息{    using System;    using System.Collections.Generic;    using System.Collections.ObjectModel;    using System.IO;    using System.Linq;    using System.Reflection;    using System.Text;    using System.Threading.Tasks;    using System.Windows.Media.Imaging;    /// <summary>    /// 主程序class    /// </summary>    class Mp3FileInfo    {        public string Mp3File { get; set; }        //注意:要先建立一个放置音乐类型的txt文件        public string GenreFile { get; set; } = @".\mp3genre.txt";        private int V1TagLength = 128;        private int V2TagHeaderLength = 10;        private string V1TagSymbol = "TAG";        private string V2TagSymbol = "ID3";        private string V2TagPictureId = "APIC";        private int[] V1TagStruct = new int[14];//id3v1数据结构        public string[] Genres;//音乐类型        private string[] Mpeg;        private string[] Layer;        private string[] Bitrate;        private string[] Hz;        private string[] Channel;        public ObservableCollection<string[]> Mp3Infos = new ObservableCollection<string[]>();        public BitmapSource CoverPicture;        public bool CoverExist = false;        public int  NewCoverType = -1;        private string[] V2TagFrameIds;        //---初始化        public Mp3FileInfo()        {            FillV1TagStruct();            FillGenres();            FillHeader();            FillV2TagFrameIds();        }        //---批量取得信息(以后再写)        public void GetMutiInfo(string path)        {        }        //---写id3v2信息(有问题,写成功后用windows的播放器播放正常,图片也出现,但歌名等信息不出现)        public void SetV2TagInfo(string path)        {            List<(string frameid, string content)> list = new List<(string, string)>();            int n = 0;            for (int i = 0; i < V2TagFrameIds.Length; i++)            {                if (Mp3Infos[i][1].Length > 0)                {                    list.Add((V2TagFrameIds[i],Mp3Infos[i][1]));                    n += Mp3Infos[i][1].Length*2 + 3 + 10;                }            }            n += 10;            byte[] _data = http://www.mamicode.com/new byte[n];            Encoding.Default.GetBytes(V2TagSymbol,0,3,_data,0);            _data[3] = 3;            int m = 10;            foreach (var info in list)            {                Encoding.Default.GetBytes(info.frameid,0,4,_data,m);                int k = info.content.Length*2 + 3;                _data[m + 4] = (byte)(k >>24);                _data[m + 5] = (byte)(k >>16);                _data[m + 6] = (byte)(k >> 8);                _data[m + 7] = (byte)k;                _data[m + 10] = 1;                _data[m + 11] = 255;                _data[m + 12] = 254;                Encoding.Unicode.GetBytes(info.content,0,info.content.Length,_data,m+13);                m =m+ k + 10;            }            m = n;            if (NewCoverType > -1)            {            }            else            {                using (FileStream fs=File.OpenRead(path))                {                    int _framelength = GetV2TagFrameLength(fs);                    byte[] _framedata = http://www.mamicode.com/new byte[_framelength];                    fs.Read(_framedata, 0, _framedata.Length);                    var _frames = GetV2TagFrameInfo(_framedata);                    int _index = -1;                    for (int i = 0; i < _frames.Count; i++)                    {                        if (string.Compare(_frames[i].frameid, V2TagPictureId) == 0)                        {                            n += _frames[i].length;                            _index = i;                            break;                        }                    }                    n = n+ (int)fs.Length - _framelength - 10;                    Array.Resize(ref _data, n);                    int k = m;                    if (_index > -1)                    {                        k = m + _frames[_index].length;                        for(int i=0; i < _frames[_index].length; i++)                        {                           _data[m++]=_framedata[_frames[_index].start + i];                        }                       }                    _data[6] = (byte)((k >> 21)&0x7F);                    _data[7] = (byte)((k >> 14) & 0x7F);                    _data[8] = (byte)((k >> 7) & 0x7F);                    _data[9] = (byte)(k & 0x7F);                    fs.Read(_data, m, (int)fs.Length - _framelength - 10);                }            }            using (FileStream fs = File.Create(@"d:\test\123.mp3"))            {                fs.Write(_data, 0, _data.Length);            }        }        //---写id3v1信息        public void SetV1TagInfo(string path)        {            byte[] info = new byte[V1TagLength];            info[0] = (byte)V1TagSymbol[0];            info[1] = (byte)V1TagSymbol[1];            info[2] = (byte)V1TagSymbol[2];            for (int i = 0; i < 5; i++)            {                string s = Mp3Infos[i][2].Trim();                Encoding.Default.GetBytes(s, 0, s.Length, info, V1TagStruct[(i + 1) * 2]);            }            info[V1TagStruct[12]] = byte.Parse(Mp3Infos[5][2]);            using (FileStream fs = File.OpenWrite(path))            {                fs.Seek(-info.Length, SeekOrigin.End);                fs.Write(info, 0, info.Length);            }        }        //---读取mp3信息        public void GetMp3Info(string path)        {            Mp3Infos.Clear();            FillMp3Infos();            using (FileStream fs = File.OpenRead(path))            {                GetV1TagInfo(fs);                int _v2TagLength = GetV2TagFrameLength(fs);                if (_v2TagLength > 0)                {                    GetV2TagInfo(fs, _v2TagLength);                    int[] _index = new int[5];                    int n = V2TagFrameIds.Length;                    GetMp3HeaderInfo(_index, fs, _v2TagLength);                    Mp3Infos[n][1] = Mpeg[_index[0]];                    Mp3Infos[n+1][1] = Layer[_index[1]];                    Mp3Infos[n+2][1] = Bitrate[_index[2]];                    Mp3Infos[n+3][1] = Hz[_index[3]];                    Mp3Infos[n+4][1] = Channel[_index[4]];                }            }        }        //---读取mp3 header 信息        private void GetMp3HeaderInfo(int[] Index, FileStream fs, int Id3v2TagFrameLength)        {            byte[] _header = new byte[3];            Func<bool> FindHeader = () =>             {                 int m = 1024;                 int start = 0;                 fs.Seek(Id3v2TagFrameLength + V2TagHeaderLength, SeekOrigin.Begin);                 while (start++ < m)                 {                     if (fs.ReadByte() == 255)                     {                         fs.Read(_header, 0, 3);                         return true;                     }                 }                 return false;             };            if (FindHeader())            {                int _mpegIndex = (_header[0] >> 3) & Convert.ToByte("00000011", 2);                int _layerIndex = (_header[0] >> 1) & Convert.ToByte("00000011", 2);                int _bitrateIndex = _header[1] >> 4;                int _hzIndex = (_header[1] >> 2) & Convert.ToByte("00000011", 2);                int _channelIndex = _header[2] >> 6;                int _bitrateIndexStep = _mpegIndex * 48 + (_layerIndex - 1) * 16;                int _hzIndexStep = _mpegIndex * 4;                Index[0] = _mpegIndex;                Index[1] = _layerIndex;                Index[2] = _bitrateIndex + _bitrateIndexStep;                Index[3] = _hzIndex + _hzIndexStep;                Index[4] = _channelIndex;            }        }        //---读取id3v2标记内容        private void GetV2TagInfo(FileStream fs, int Length)        {            CoverExist = false;            NewCoverType = -1;            byte[] _v2tag = new byte[Length];            fs.Seek(V2TagHeaderLength, SeekOrigin.Begin);            fs.Read(_v2tag, 0, _v2tag.Length);            var _frames = GetV2TagFrameInfo(_v2tag);            foreach (var _frame in _frames)            {                int _index = GetV2TagFrameIdIndex(_frame.frameid);                if (_index > -1)                {                    Mp3Infos[_index][1] = GetFrameStrContent(_v2tag, _frame.start + 10, _frame.length - 10);                }                else                {                    //如果是APIC,则读取图片                    if (string.Compare(_frame.frameid, V2TagPictureId) == 0)                    {                        GetImage(_v2tag, _frame.start + 10, _frame.length - 10);                    }                }            }        }        //---读取图片        private void GetImage(byte[] source, int start, int contentLength)        {            //寻找图片位置            Func<byte[], (bool found, int startpos)> FindImage = symbol =>                {                    int n = start;                    int m = start + 30;                    while (n < m)                    {                        if (n > m - symbol.Length)                        {                            return (false, -1);                        }                        if (source[n] == symbol[0] && source[n + 1] == symbol[1] && source[n + 2] == symbol[2])                        {                            return (true, n);                        }                        n++;                    }                    return (false, -1);                };            //取得图片信息            Func<(int ImageKind, int startpos)> GetImageInfo = () =>             {                 byte[] _imghead = new byte[3];                 //jpeg header                 _imghead[0] = 0xFF;                 _imghead[1] = 0xD8;                 _imghead[2] = 0xFF;                 var t = FindImage(_imghead);                 if (t.found)                 {                     return (0, t.startpos);                 }                 //png header                 _imghead[0] = 0x89;                 _imghead[1] = 0x50;                 _imghead[2] = 0x4E;                 t = FindImage(_imghead);                 if (t.found)                 {                     return (1, t.startpos);                 }                 return (-1, -1);             };            //读取图片            var p = GetImageInfo();            if (p.ImageKind > -1)            {                CoverExist = true;                MemoryStream ms = new MemoryStream();                ms.Write(source, p.startpos, contentLength + start - 10 - p.startpos);                ms.Seek(0, SeekOrigin.Begin);                switch (p.ImageKind)                {                    case 0:                        JpegBitmapDecoder jpeg = new JpegBitmapDecoder(ms, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);                        CoverPicture = jpeg.Frames[0];                        break;                    case 1:                        PngBitmapDecoder png = new PngBitmapDecoder(ms, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);                        CoverPicture = png.Frames[0];                        break;                }            }        }        //---读取v2 Frame string内容        private string GetFrameStrContent(byte[] source, int start, int length)        {            if (source[start + 1] == 255 && source[start + 2] == 254)            {                return Encoding.Unicode.GetString(source, start + 3, length - 3);            }            if (source[start + 1] == 254 && source[start + 2] == 255)            {                return Encoding.BigEndianUnicode.GetString(source, start + 3, length - 3);            }            return Encoding.Default.GetString(source, start + 1, length - 1);        }        //---根据V2TagFrameIds,找出FrameId在mp3infos的index        private int GetV2TagFrameIdIndex(string FrameId)        {            for (int i = 0; i < V2TagFrameIds.Length; i++)            {                if (string.Compare(V2TagFrameIds[i], FrameId) == 0)                {                    return i;                }            }            return -1;        }        //---读取v2tag frame 信息        private List<(string frameid, int start, int length)> GetV2TagFrameInfo(byte[] FrameData)        {            int n = 0;            List<(string frameid, int length, int start)> _frames = new List<(string frameid, int length, int start)>();            while (n < FrameData.Length - 10)            {                int _length = FrameData[n + 4] << 24 | FrameData[n + 5] << 16 | FrameData[n + 6] << 8 | FrameData[n + 7];                if (_length > 0)                {                    _frames.Add((Encoding.Default.GetString(FrameData, n, 4), n, _length + 10));                    n += _length;                }                n += 10;            }            return _frames;        }        //---判断 id3v2标志是否存在,并计算大小        private int GetV2TagFrameLength(FileStream fs)        {            fs.Seek(0, SeekOrigin.Begin);            byte[] _head = new byte[V2TagHeaderLength];            fs.Read(_head, 0, _head.Length);            if (string.Compare(Encoding.Default.GetString(_head, 0, 3), V2TagSymbol) == 0)            {                return _head[6] << 21 | _head[7] << 14 | _head[8] << 7 | _head[9];            }            return 0;        }        //---读取id3v1 Tag 信息        private void GetV1TagInfo(FileStream fs)        {            //取得ascii编码的字符串截止到 0 的数据长度            Func<byte[], int, int, int> GetStringDataLength = (source, start, length) =>               {                   for (int i = 0; i < length; i++)                   {                       if (source[start + i] == 0)                       {                           return i;                       }                   }                   return length;               };            byte[] _v1Tag = new byte[V1TagLength];            fs.Seek(-_v1Tag.Length, SeekOrigin.End);            fs.Read(_v1Tag, 0, _v1Tag.Length);            if (string.Compare(Encoding.Default.GetString(_v1Tag, V1TagStruct[0], V1TagStruct[1]), V1TagSymbol) == 0)            {                for (int i = 0; i < 5; i++)                {                    Mp3Infos[i][2] = Encoding.Default.GetString(_v1Tag, V1TagStruct[(i + 1) * 2],                        GetStringDataLength(_v1Tag, V1TagStruct[(i + 1) * 2], V1TagStruct[(i + 1) * 2 + 1]));                }                Mp3Infos[5][2] = _v1Tag[V1TagStruct[12]].ToString();            }        }        //---填充id3v2Tag Frame 标志        private void FillV2TagFrameIds()        {            V2TagFrameIds = new string[]{                "TIT2","TPE1","TALB","TYER","COMM","TCON",                "TPE2","TCOM","TPE3","TPE4","TRCK","TCOP"            };        }        //---填充Mp3infos        private void FillMp3Infos()        {            Mp3Infos.Add(new string[] { "歌名", "", "" });            Mp3Infos.Add(new string[] { "表演", "", "" });            Mp3Infos.Add(new string[] { "专辑", "", "" });            Mp3Infos.Add(new string[] { "年份", "", "" });            Mp3Infos.Add(new string[] { "备注", "", "" });            Mp3Infos.Add(new string[] { "种类", "", "" });            //以下为id3v2tag增加            Mp3Infos.Add(new string[] { "乐队", "", "" });            Mp3Infos.Add(new string[] { "作曲", "", "" });            Mp3Infos.Add(new string[] { "指挥", "", "" });            Mp3Infos.Add(new string[] { "重编", "", "" });            Mp3Infos.Add(new string[] { "音轨", "", "" });            Mp3Infos.Add(new string[] { "版权", "", "" });            //以下为mp3数据头            Mp3Infos.Add(new string[] { "Mpeg", "", "" });            Mp3Infos.Add(new string[] { "Layer", "", "" });            Mp3Infos.Add(new string[] { "波特率", "", "" });            Mp3Infos.Add(new string[] { "频率", "", "" });            Mp3Infos.Add(new string[] { "声道", "", "" });        }        //填充mp3数据头的数据表        private void FillHeader()        {            Mpeg = new string[] { "MPEG 2.5", "Reserved", "MPEG 2", "MPEG 1" };            Layer = new string[] { "Reserved", "Layer III", "Layer II", "Layer I" };            Bitrate = new string[]            {                "free","8","16","24","32","40","48","56","64","80","96","112","128","144","160","bad",                "free","8","16","24","32","40","48","56","64","80","96","112","128","144","160","bad",                "free","32","48","56","64","80","96","112","128","144","160","176","192","224","256","bad",                "free","0","0","0","0","0","0","0","0","0","0","0","0","0","0","bad",                "free","0","0","0","0","0","0","0","0","0","0","0","0","0","0","bad",                "free","0","0","0","0","0","0","0","0","0","0","0","0","0","0","bad",                "free","8","16","24","32","40","48","56","64","80","96","112","128","144","160","bad",                "free","8","16","24","32","40","48","56","64","80","96","112","128","144","160","bad",                "free","32","48","56","64","80","96","112","128","144","160","176","192","224","256","bad",                "free","32","40","48","56","64","80","96","112","128","160","192","224","256","320","bad",                "free","32","48","56","64","80","96","112","128","160","192","224","256","320","384","bad",                "free","32","64","96","128","160","192","224","256","288","320","352","384","416","448","bad",            };            Hz = new string[]            {                "11025","12000","8000","Reserved",                "0","0","0","Reserved",                "22050","24000","16000","Reserved",                "44100","48000","32000","Reserved"            };            /*“联合立体声模式”是音频编码的立体声模式之一。联合立体声模式充分利用左右声道的相似之处,             * 对于左右声道的相同部分不再重复编码,减少了数据的浪费,这样就可以做到在较低的位率下表现更丰富的细节。             * 对于左右声道差异不大的音频来说,联合立体声编码模式通常在较低的位率下就可以得到不错的效果。             * 而“立体声模式”则使用两个相互独立的声道进行编码,因此它需要较多的位率,但它的左右声道的分离度较高,             * 通常使用在位率较高的场合,用于高质量的音频编码。             */            Channel = new string[] { "立体声", "联合立体声", "双声道", "单声道" };        }        //---填充音乐类型表        private void FillGenres()        {            string[] str = File.ReadAllText(GenreFile).Split(new char[] { (char)13, (char)10, . }, StringSplitOptions.RemoveEmptyEntries);            Genres = new string[str.Length / 2];            for (int i = 1; i < str.Length; i += 2)            {                Genres[(i - 1) / 2] = str[i];            }        }        //---填充 Id3v1 数据结构        private void FillV1TagStruct()        {            //symbol            V1TagStruct[0] = 0;//start pos            V1TagStruct[1] = 3;//length            //song title            V1TagStruct[2] = 3;            V1TagStruct[3] = 30;            //artist            V1TagStruct[4] = 33;            V1TagStruct[5] = 30;            //album            V1TagStruct[6] = 63;            V1TagStruct[7] = 30;            //year            V1TagStruct[8] = 93;            V1TagStruct[9] = 4;            //comment            V1TagStruct[10] = 97;            V1TagStruct[11] = 30;            //genre            V1TagStruct[12] = 127;            V1TagStruct[13] = 1;        }    }}
View Code
技术分享
//mp3genre.txt      0.Blues      1.Classic Rock      2.Country      3.Dance      4.Disco      5.Funk      6.Grunge      7.Hip-Hop      8.Jazz      9.Metal     10.New Age     11.Oldies     12.Other     13.Pop     14.R&B     15.Rap     16.Reggae     17.Rock     18.Techno     19.Industrial     20.Alternative     21.Ska     22.Death Metal     23.Pranks     24.Soundtrack     25.Euro-Techno     26.Ambient     27.Trip-Hop     28.Vocal     29.Jazz+Funk     30.Fusion     31.Trance     32.Classical     33.Instrumental     34.Acid     35.House     36.Game     37.Sound Clip     38.Gospel     39.Noise     40.AlternRock     41.Bass     42.Soul     43.Punk     44.Space     45.Meditative     46.Instrumental Pop     47.Instrumental Rock     48.Ethnic     49.Gothic     50.Darkwave     51.Techno-Industrial     52.Electronic     53.Pop-Folk     54.Eurodance     55.Dream     56.Southern Rock     57.Comedy     58.Cult     59.Gangsta     60.Top 40     61.Christian Rap     62.Pop/Funk     63.Jungle     64.Native American     65.Cabaret     66.New Wave     67.Psychadelic     68.Rave     69.Showtunes     70.Trailer     71.Lo-Fi     72.Tribal     73.Acid Punk     74.Acid Jazz     75.Polka     76.Retro     77.Musical     78.Rock & Roll     79.Hard Rock     80.Folk     81.Folk-Rock     82.National Folk     83.Swing     84.Fast Fusion     85.Bebob     86.Latin     87.Revival     88.Celtic     89.Bluegrass     90.Avantgarde     91.Gothic Rock     92.Progressive Rock     93.Psychedelic Rock     94.Symphonic Rock     95.Slow Rock     96.Big Band     97.Chorus     98.Easy Listening     99.Acoustic    100.Humour    101.Speech    102.Chanson    103.Opera    104.Chamber Music    105.Sonata    106.Symphony    107.Booty Bass    108.Primus    109.Porn Groove    110.Satire    111.Slow Jam    112.Club    113.Tango    114.Samba    115.Folklore    116.Ballad    117.Power Ballad    118.Rhythmic Soul    119.Freestyle    120.Duet    121.Punk Rock    122.Drum Solo    123.Acapella    124.Euro-House    125.Dance Hall
View Code

 

MP3 信息读取