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：
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 |
|---|---|---|
| 0 | 3 | 标记 Tag |
| 3 | 30 | 歌曲名 SongTitle |
| 33 | 30 | 表演者 Artist |
| 63 | 30 | 专辑 Album |
| 93 | 4 | 年份 Year |
| 97 | 30 | 备注 Comment |
| 127 | 1 | 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 |
|---|---|---|
| 0 | 3 | 标志 Tag |
| 3 | 2 | 版本 version |
| 5 | 1 | Flag |
| 6 | 4 | Frame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=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 |
|---|---|---|---|
| 头 | 0 | 4 | 标记 Frame ID |
| 头 | 5 | 4 | 内容长度 |
| 头 | 8 | 2 | Flages |
| 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=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 |
|---|---|---|
| 0 | 1 | Text encoding |
| 1 | Frame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：
附练手全程序：
<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>
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); } } }
/****************************************************** * 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 = 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 = 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: est123.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; } } }
//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