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[ASP.net教程]csharp: Sound recording


using System;using System.Collections.Generic;using System.Linq;using System.Text;using Microsoft.DirectX;using Microsoft.DirectX.DirectSound;using System.IO;using System.Threading;using System.Data;using System.Drawing;using System.Windows.Forms;namespace AudioBaiduDemo{  /// <summary>  /// DirectSound录音  /// http://blog.csdn.net/woaixiaozhe/article/details/7852824/  /// </summary>  public class SoundRecorder  {    #region 成员数据    private Capture mCapDev = null;       // 音频捕捉设备    private CaptureBuffer mRecBuffer = null;   // 缓冲区对象    private WaveFormat mWavFormat;        // 录音的格式    private int mNextCaptureOffset = 0;     // 该次录音缓冲区的起始点    private int mSampleCount = 0;        // 录制的样本数目    private Notify mNotify = null;        // 消息通知对象    public const int cNotifyNum = 16;      // 通知的个数    private int mNotifySize = 0;        // 每次通知大小    private int mBufferSize = 0;        // 缓冲队列大小    private Thread mNotifyThread = null;         // 处理缓冲区消息的线程    private AutoResetEvent mNotificationEvent = null;  // 通知事件    private string mFileName = string.Empty;   // 文件保存路径    private FileStream mWaveFile = null;     // 文件流    private BinaryWriter mWriter = null;     // 写文件    #endregion    #region 对外操作函数    /// <summary>    /// 构造函数,设定录音设备,设定录音格式.    /// <summary>    public SoundRecorder()    {      // 初始化音频捕捉设备      InitCaptureDevice();      // 设定录音格式      mWavFormat = CreateWaveFormat();    }    /// <summary>    /// 创建录音格式,此处使用16bit,16KHz,Mono的录音格式    /// <summary>    private WaveFormat CreateWaveFormat()    {      Microsoft.DirectX.DirectSound.WaveFormat format = new Microsoft.DirectX.DirectSound.WaveFormat();//.WaveFormat();      format.FormatTag = WaveFormatTag.Pcm;  // PCM      format.SamplesPerSecond = 16000;    // 采样率:16KHz      format.BitsPerSample = 16;       // 采样位数:16Bit      format.Channels = 1;          // 声道:Mono      format.BlockAlign = (short)(format.Channels * (format.BitsPerSample / 8)); // 单位采样点的字节数       format.AverageBytesPerSecond = format.BlockAlign * format.SamplesPerSecond;      return format;      // 按照以上采样规格,可知采样1秒钟的字节数为 16000*2=32000B 约为31K    }    /// <summary>    /// 设定录音结束后保存的文件,包括路径    /// </summary>    /// <param name="filename">保存wav文件的路径名</param>    public void SetFileName(string filename)    {      mFileName = filename;    }    /// <summary>    /// 开始录音    /// </summary>    public void RecStart()    {      // 创建录音文件      CreateSoundFile();      // 创建一个录音缓冲区,并开始录音      CreateCaptureBuffer();      // 建立通知消息,当缓冲区满的时候处理方法      InitNotifications();      mRecBuffer.Start(true);    }    /// <summary>    /// 停止录音    /// </summary>    public void RecStop()    {      mRecBuffer.Stop();   // 调用缓冲区的停止方法,停止采集声音      if (null != mNotificationEvent)        mNotificationEvent.Set();    //关闭通知      mNotifyThread.Abort(); //结束线程      RecordCapturedData();  // 将缓冲区最后一部分数据写入到文件中      // 写WAV文件尾      mWriter.Seek(4, SeekOrigin.Begin);      mWriter.Write((int)(mSampleCount + 36));  // 写文件长度      mWriter.Seek(40, SeekOrigin.Begin);      mWriter.Write(mSampleCount);        // 写数据长度      mWriter.Close();      mWaveFile.Close();      mWriter = null;      mWaveFile = null;    }    #endregion    #region 对内操作函数    /// <summary>    /// 初始化录音设备,此处使用主录音设备.    /// </summary>    /// <returns>调用成功返回true,否则返回false</returns>    private bool InitCaptureDevice()    {      // 获取默认音频捕捉设备      CaptureDevicesCollection devices = new CaptureDevicesCollection(); // 枚举音频捕捉设备      Guid deviceGuid = Guid.Empty;      if (devices.Count > 0)        deviceGuid = devices[0].DriverGuid;      else      {        MessageBox.Show("系统中没有音频捕捉设备");        return false;      }      // 用指定的捕捉设备创建Capture对象      try      {        mCapDev = new Capture(deviceGuid);      }      catch (DirectXException e)      {        MessageBox.Show(e.ToString());        return false;      }      return true;    }    /// <summary>    /// 创建录音使用的缓冲区    /// </summary>    private void CreateCaptureBuffer()    {      // 缓冲区的描述对象      Microsoft.DirectX.DirectSound.CaptureBufferDescription bufferdescription = new Microsoft.DirectX.DirectSound.CaptureBufferDescription();      if (null != mNotify)      {        mNotify.Dispose();        mNotify = null;      }      if (null != mRecBuffer)      {        mRecBuffer.Dispose();        mRecBuffer = null;      }      // 设定通知的大小,默认为1s钟      mNotifySize = (1024 > mWavFormat.AverageBytesPerSecond / 8) ? 1024 : (mWavFormat.AverageBytesPerSecond / 8);      mNotifySize -= mNotifySize % mWavFormat.BlockAlign;      // 设定缓冲区大小      mBufferSize = mNotifySize * cNotifyNum;      // 创建缓冲区描述      bufferdescription.BufferBytes = mBufferSize;      bufferdescription.Format = mWavFormat;      // 录音格式      // 创建缓冲区      mRecBuffer = new CaptureBuffer(bufferdescription, mCapDev);      mNextCaptureOffset = 0;    }    /// <summary>    /// 初始化通知事件,将原缓冲区分成16个缓冲队列,在每个缓冲队列的结束点设定通知点.    /// </summary>    /// <returns>是否成功</returns>    private bool InitNotifications()    {      if (null == mRecBuffer)      {        MessageBox.Show("未创建录音缓冲区");        return false;      }      // 创建一个通知事件,当缓冲队列满了就激发该事件.      mNotificationEvent = new AutoResetEvent(false);      // 创建一个线程管理缓冲区事件      if (null == mNotifyThread)      {        mNotifyThread = new Thread(new ThreadStart(WaitThread));        mNotifyThread.Start();      }      // 设定通知的位置      BufferPositionNotify[] PositionNotify = new BufferPositionNotify[cNotifyNum + 1];      for (int i = 0; i < cNotifyNum; i++)      {        PositionNotify[i].Offset = (mNotifySize * i) + mNotifySize - 1;        PositionNotify[i].EventNotifyHandle = mNotificationEvent.SafeWaitHandle.DangerousGetHandle();      }      mNotify = new Notify(mRecBuffer);      mNotify.SetNotificationPositions(PositionNotify, cNotifyNum);      return true;    }    /// <summary>    /// 接收缓冲区满消息的处理线程    /// </summary>    private void WaitThread()    {      while (true)      {        // 等待缓冲区的通知消息        mNotificationEvent.WaitOne(Timeout.Infinite, true);        // 录制数据        RecordCapturedData();      }    }    /// <summary>    /// 将录制的数据写入wav文件    /// </summary>    private void RecordCapturedData()    {      byte[] CaptureData = null;      int ReadPos = 0, CapturePos = 0, LockSize = 0;      mRecBuffer.GetCurrentPosition(out CapturePos, out ReadPos);      LockSize = ReadPos - mNextCaptureOffset;      if (LockSize < 0)    // 因为是循环的使用缓冲区,所以有一种情况下为负:当文以载读指针回到第一个通知点,而Ibuffeoffset还在最后一个通知处        LockSize += mBufferSize;      LockSize -= (LockSize % mNotifySize);  // 对齐缓冲区边界,实际上由于开始设定完整,这个操作是多余的.      if (0 == LockSize)        return;      // 读取缓冲区内的数据      CaptureData = (byte[])mRecBuffer.Read(mNextCaptureOffset, typeof(byte), LockFlag.None, LockSize);      // 写入Wav文件      mWriter.Write(CaptureData, 0, CaptureData.Length);      // 更新已经录制的数据长度.      mSampleCount += CaptureData.Length;      // 移动录制数据的起始点,通知消息只负责指示产生消息的位置,并不记录上次录制的位置      mNextCaptureOffset += CaptureData.Length;      mNextCaptureOffset %= mBufferSize; // Circular buffer    }    /// <summary>    /// 创建保存的波形文件,并写入必要的文件头.    /// </summary>    private void CreateSoundFile()    {      // Open up the wave file for writing.      mWaveFile = new FileStream(mFileName, FileMode.Create);      mWriter = new BinaryWriter(mWaveFile);      /**************************************************************************        Here is where the file will be created. A        wave file is a RIFF file, which has chunks        of data that describe what the file contains.        A wave RIFF file is put together like this:        The 12 byte RIFF chunk is constructed like this:        Bytes 0 - 3 : 'R' 'I' 'F' 'F'        Bytes 4 - 7 : Length of file, minus the first 8 bytes of the RIFF description.                 (4 bytes for "WAVE" + 24 bytes for format chunk length +                 8 bytes for data chunk description + actual sample data size.)         Bytes 8 - 11: 'W' 'A' 'V' 'E'         The 24 byte FORMAT chunk is constructed like this:         Bytes 0 - 3 : 'f' 'm' 't' ' '         Bytes 4 - 7 : The format chunk length. This is always 16.         Bytes 8 - 9 : File padding. Always 1.         Bytes 10- 11: Number of channels. Either 1 for mono, or 2 for stereo.         Bytes 12- 15: Sample rate.         Bytes 16- 19: Number of bytes per second.         Bytes 20- 21: Bytes per sample. 1 for 8 bit mono, 2 for 8 bit stereo or                 16 bit mono, 4 for 16 bit stereo.         Bytes 22- 23: Number of bits per sample.         The DATA chunk is constructed like this:         Bytes 0 - 3 : 'd' 'a' 't' 'a'         Bytes 4 - 7 : Length of data, in bytes.         Bytes 8 -: Actual sample data.        ***************************************************************************/      // Set up file with RIFF chunk info.      char[] ChunkRiff = { 'R', 'I', 'F', 'F' };      char[] ChunkType = { 'W', 'A', 'V', 'E' };      char[] ChunkFmt = { 'f', 'm', 't', ' ' };      char[] ChunkData = { 'd', 'a', 't', 'a' };      short shPad = 1;        // File padding      int nFormatChunkLength = 0x10; // Format chunk length.      int nLength = 0;        // File length, minus first 8 bytes of RIFF description. This will be filled in later.      short shBytesPerSample = 0;   // Bytes per sample.      // 一个样本点的字节数目      if (8 == mWavFormat.BitsPerSample && 1 == mWavFormat.Channels)        shBytesPerSample = 1;      else if ((8 == mWavFormat.BitsPerSample && 2 == mWavFormat.Channels) || (16 == mWavFormat.BitsPerSample && 1 == mWavFormat.Channels))        shBytesPerSample = 2;      else if (16 == mWavFormat.BitsPerSample && 2 == mWavFormat.Channels)        shBytesPerSample = 4;      // RIFF 块      mWriter.Write(ChunkRiff);      mWriter.Write(nLength);      mWriter.Write(ChunkType);      // WAVE块      mWriter.Write(ChunkFmt);      mWriter.Write(nFormatChunkLength);      mWriter.Write(shPad);      mWriter.Write(mWavFormat.Channels);      mWriter.Write(mWavFormat.SamplesPerSecond);      mWriter.Write(mWavFormat.AverageBytesPerSecond);      mWriter.Write(shBytesPerSample);      mWriter.Write(mWavFormat.BitsPerSample);      // 数据块      mWriter.Write(ChunkData);      mWriter.Write((int)0);  // The sample length will be written in later.    }    #endregion  }}

  测试:

  /// <summary>  ///   /// </summary>  public partial class Form4 : Form  {    private SoundRecorder recorder = null;  // 录音     string wavfile = "";    /// <summary>    ///     /// </summary>    public Form4()    {      InitializeComponent();      recorder = new SoundRecorder();     }    /// <summary>    ///     /// </summary>    /// <param name="sender"></param>    /// <param name="e"></param>    private void Form4_Load(object sender, EventArgs e)    {    }    /// <summary>    /// 录音设置    /// </summary>    /// <param name="sender"></param>    /// <param name="e"></param>    private void button2_Click(object sender, EventArgs e)    {      string wavfile = null;      wavfile = "test.wav";      recorder.SetFileName(wavfile);      recorder.RecStart();    }    /// <summary>    /// 停止    /// </summary>    /// <param name="sender"></param>    /// <param name="e"></param>    private void button3_Click(object sender, EventArgs e)    {      recorder.RecStop();      recorder = null;    }