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C# 音频操作系统项目总结

此项目需求是针对.wav格式音频进行操作,转换成相应的.mp3格式的音频文件,对音频进行切割,最后以需求的形式输出,此篇会回顾运用到的一些知识点。

1.MDI子窗口的建立:

首先一个窗体能够创建多个MDI窗体,应当将IsMDIContainer属性设为true;以下为效果图:

C# 音频操作系统项目总结

控制窗体切换的是一个DotNetBar.TabStrip控件,style属性为Office2007Document,TabLayOutType:FixedWithNavigationBox

创建窗体的代码如下:

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/// <summary> 
 /// 创建MDI子窗体类 
 /// </summary> 
 class CreateMDIWindow 
 
      /// <summary> 
     /// 当前程序的主窗体对象 
     /// </summary> 
     public static Form MainForm { get; set; } 
      
     /// <summary> 
     /// 创建子窗口 
     /// </summary> 
     ///
<typeparam name="T">     窗口类型
</typeparam>      
     public static void CreateChildWindow
<t>     () where T : Form, new() 
     // where 子句还可以包括构造函数约束。 可以使用 new 运算符创建类型参数的实例;但类型参数为此必须受构造函数约束  
     // new() 的约束。 new() 约束可以让编译器知道:提供的任何类型参数都必须具有可访问的无参数(或默认)构造函数。            
     
         T form = null
    
         var childForms = MainForm.MdiChildren; 
         //遍历窗体 
         foreach (Form f in childForms) 
         
             if (f is T) 
             
                 form = f as T; 
                 break
             
         
         //如果没有,则创建 
         if (form == null
         
             //新建窗体 
             form = new T(); 
             //设定窗体的图标 
             form.Icon = System.Drawing.Icon.FromHandle(Properties.Resources.MainIcon.GetHicon()); 
             //设定窗体的主图标 
             form.MdiParent = MainForm; 
             //设定窗体的边框类型 
             form.FormBorderStyle = FormBorderStyle.FixedToolWindow; 
         
         //窗口如何显示 
         form.WindowState = FormWindowState.Maximized; 
         form.Show(); 
     
 
</t>

前台点击按钮调用代码:CreateMDIWindow.CreateChildWindow ();  <>里为窗体的名称。

2.序列化与反序列化:

当一个系统你有默认的工作目录,默认的文件保存路径,且这些数据时唯一的,你希望每次打开软件都会显示这些数据,也可以更新这些数据,可以使用序列化与反序列化。

C# 音频操作系统项目总结

我们以项目存储根目录和选择项目为例:

代码如下:

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[Serializable] 
public  class UserSetting 
    /// <summary> 
    /// 序列化存储路径 
    /// </summary> 
    private string FilePath{ get { return Path.Combine(Environment.CurrentDirectory, "User.data"); } } 
   
    /// <summary> 
    /// 音频资源存储目录 
    /// </summary> 
    public  string AudioResourceFolder { get; set; } 
   
    /// <summary> 
    /// 项目名称 
    /// </summary> 
    public string Solution { get; set; } 
   
    /// <summary> 
    /// 构造函数,创建序列化存储文件 
    /// </summary> 
    public UserSetting() 
    
        if (!File.Exists(FilePath)) 
        
            FileStream fs = File.Create(FilePath); 
            fs.Close();//不关闭文件流,首次创建该文件后不能被使用买现成会被占用 
        }       
    
   
    /// <summary> 
    /// 通过反序列化方法,获得保存的数据 
    /// </summary>       
    public UserSetting ReadUserSetting()        
    
        using (FileStream fs = new FileStream(FilePath, FileMode.Open,FileAccess.Read)) 
        
            object ob = null
            if (fs.Length > 0) 
            
                SoapFormatter sf = new SoapFormatter(); 
                ob = sf.Deserialize(fs);                   
            
            return ob as UserSetting; 
        
    
   
    /// <summary> 
    /// 通过序列化方式,保存数据 
    /// </summary>       
    public void SaveUserSetting(object obj) 
    
        using (FileStream fs = new FileStream(FilePath, FileMode.OpenOrCreate, FileAccess.Write)) 
        
            SoapFormatter sf = new SoapFormatter(); 
            sf.Serialize(fs,obj); 
        
    
       
}

3.Datagridview动态生成:

C# 音频操作系统项目总结

根据设置的楼层生成相应楼层带button按钮的datagridview,并且每层按钮为每层选定选择音乐,代码如下:

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/// <summary> 
/// 绑定楼层音乐属性 
/// </summary> 
private void BindData(int elevatorLow,int number) 
    try 
    
        DataTable list = new DataTable(); 
        list.Columns.Clear(); 
        list.Columns.Add(new DataColumn("name", typeof(string))); 
        list.Columns.Add(new DataColumn("musicPath", typeof(string)));              
        for (int i =0; i < number; i++) 
        
            //不包括楼层0层 
            if (elevatorLow != 0) 
            
                list.Rows.Add(list.NewRow()); 
                list.Rows[i][0] = elevatorLow; 
            
            else { i--; } 
            elevatorLow++; 
        
        dataGridViewX1.DataSource = list; 
    
    catch (Exception ex) 
    { MessageBox.Show(ex.ToString()); } 
}

选择音乐按钮事件:

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private void dataGridViewX1_CellContentClick(object sender, DataGridViewCellEventArgs e) 
    try 
    {          
        //点击选择按钮触发的事件 
        if (e.RowIndex >= 0) 
        
            DataGridViewColumn column = dataGridViewX1.Columns[e.ColumnIndex]; 
            if (column is DataGridViewButtonColumn) 
            
                OpenFileDialog openMusic = new OpenFileDialog(); 
                openMusic.AddExtension = true
                openMusic.Multiselect = true
                openMusic.Filter = "MP3文件(*.mp3)|*mp3";                    
                if (openMusic.ShowDialog() == DialogResult.OK) 
                
                    dataGridViewX1.Rows[e.RowIndex].Cells[2].Value = http://www.mamicode.com/Path.GetFileName(openMusic.FileName);
                
            
        
    
    catch(Exception ex) 
    { MessageBox.Show(ex.ToString()); } 
}

4.获得音乐文件属性:

使用Shellclass获得文件属性可以参考  点击打开链接   

C# 音频操作系统项目总结

代码如下:

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/// <summary> 
/// 获得音乐长度 
/// </summary> 
/// <param name="filePath">文件的完整路径 
public static string[] GetMP3Time(string filePath) 
    string dirName = Path.GetDirectoryName(filePath); 
    string SongName = Path.GetFileName(filePath);//获得歌曲名称            
    ShellClass sh = new ShellClass(); 
    Folder dir = sh.NameSpace(dirName); 
    FolderItem item = dir.ParseName(SongName); 
    string SongTime = dir.GetDetailsOf(item, 27);//27为获得歌曲持续时间 ,28为获得音乐速率,1为获得音乐文件大小     
    string[] time = Regex.Split(SongTime, ":"); 
    return time; 
}


5.音频操作:

音频的操作用的fmpeg.exe ,下载地址

fmpeg放在bin目录下,代码如下:

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/// <summary> 
/// 转换函数 
/// </summary> 
/// <param name="exe">ffmpeg程序 
/// <param name="arg">执行参数      
public static void ExcuteProcess(string exe, string arg) 
    using (var p = new Process()) 
    {              
            p.StartInfo.FileName = exe; 
            p.StartInfo.Arguments = arg; 
            p.StartInfo.UseShellExecute = false;    //输出信息重定向 
            p.StartInfo.CreateNoWindow = true
            p.StartInfo.RedirectStandardError = true
            p.StartInfo.RedirectStandardOutput = true
            p.Start();                    //启动线程 
            p.BeginOutputReadLine(); 
            p.BeginErrorReadLine(); 
            p.WaitForExit();//等待进程结束                                       
    
}

音频转换的代码如下:

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private void btnConvert_Click(object sender, EventArgs e) 
    //转换MP3 
    if (txtMp3Music.Text != ""
    
        string fromMusic = Statics.Setting.AudioResourceFolder + "\\" + Statics.Setting.Solution+"\\" + cobFolders.Text + "\\" + txtMusic.Text;//转换音乐路径 
        string toMusic = Statics.Setting.AudioResourceFolder + "\\" + Statics.Setting.Solution+"\\" + cobFolders.Text + "\\" + txtMp3Music.Text;//转换后音乐路径 
        int bitrate = Convert.ToInt32(cobBitRate.Text) * 1000;//恒定码率 
        string Hz = cobHz.Text;//采样频率 
   
        try 
        
            MP3Convertion.ExcuteProcess("ffmpeg.exe", "-y -ab " + bitrate + " -ar " + Hz + " -i \"" + fromMusic + "\" \"" + toMusic + "\""); 
            if (cbRetain.Checked == false
            
                File.Delete(fromMusic); 
                BindList(); 
            
            else 
            
                foreach (ListViewItem lt in listMusics.Items) 
                
                    if (lt.Text == txtMusic.Text) 
                    
                        listMusics.Items.Remove(lt); 
                    
                
            
   
            //转换完成 
            MessageBox.Show("转换完成"); 
            txtMusic.Text = ""
            txtMp3Music.Text = ""
        
        catch (Exception ex) 
        { MessageBox.Show(ex.ToString()); } 
    
    else 
    
        MessageBox.Show("请选择你要转换的音乐");  
    
}

音频切割的代码如下:

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private void btnCut_Click(object sender, EventArgs e) 
    SaveFileDialog saveMusic = new SaveFileDialog(); 
    saveMusic.Title = "选择音乐文件存放的位置"
    saveMusic.DefaultExt = ".mp3"
    saveMusic.InitialDirectory = Statics.Setting.AudioResourceFolder +"\\"  + Statics.Setting.Solution+"\\" + cobFolders.Text; 
    string fromPath = Statics.Setting.AudioResourceFolder + "\\" + Statics.Setting.Solution +"\\"+ cobFolders.Text + "\\" + txtMusic.Text;//要切割音乐的物理路径 
    string startTime = string.Format("0:{0}:{1}", txtBeginM.Text, txtBeginS.Text).Trim();//歌曲起始时间 
    int duration = (Convert.ToInt32(this.txtEndM.Text) * 60 + Convert.ToInt32(this.txtEndS.Text)) - (Convert.ToInt32(this.txtBeginM.Text) * 60 + Convert.ToInt32(this.txtBeginS.Text)); 
    string endTime = string.Format("0:{0}:{1}", duration / 60, duration % 60);//endTime是持续的时间,不是歌曲结束的时间 
    if (saveMusic.ShowDialog() == DialogResult.OK) 
    
        string savePath = saveMusic.FileName;//切割后音乐保存的物理路径 
        try 
        
            MP3Convertion.ExcuteProcess("ffmpeg.exe", "-y -i \"" + fromPath + "\" -ss " + startTime + " -t " + endTime + " -acodec copy \"" + savePath+"\"");//-acodec copy表示歌曲的码率和采样频率均与前者相同 
            MessageBox.Show("已切割完成"); 
        
        catch (Exception ex) 
        
            MessageBox.Show(ex.ToString()); 
        }                
    
}

切割音频操作系统的知识点就总结道这了,就是fmpeg的应用。

转自:http://blog.csdn.net/kaoleba126com/article/details/7570745

C# 音频操作系统项目总结