WaveInBuffer class role in the projet of capture sound in the code project

public WaveInBuffer(IntPtr waveInHandle, int size)
{
    m_WaveIn = waveInHandle;
    m_HeaderHandle = GCHandle.Alloc(m_Header, GCHandleType.Pinned);
    m_Header.dwUser = (IntPtr)GCHandle.Alloc(this);
    m_HeaderData = new byte[size];
    m_HeaderDataHandle = GCHandle.Alloc(m_HeaderData, GCHandleType.Pinned);
    m_Header.lpData = m_HeaderDataHandle.AddrOfPinnedObject();
    m_Header.dwBufferLength = size;
    WaveInHelper.Try(WaveNative.waveInPrepareHeader(m_WaveIn, ref m_Header, Marshal.SizeOf(m_Header)));
}
~WaveInBuffer()
{
    Dispose();
}
public void Dispose()
{
    if (m_Header.lpData != IntPtr.Zero)
    {
        WaveNative.waveInUnprepareHeader(m_WaveIn, ref m_Header, Marshal.SizeOf(m_Header));
        m_HeaderHandle.Free();
        m_Header.lpData = IntPtr.Zero;
    }
    m_RecordEvent.Close();
    if (m_HeaderDataHandle.IsAllocated)
        m_HeaderDataHandle.Free();
    GC.SuppressFinalize(this);
}

public int Size
{
    get { return m_Header.dwBufferLength; }
}
public IntPtr Data
{
    get { return m_Header.lpData; }
}

public bool Record()
{
    lock (this)
    {
        m_RecordEvent.Reset();
        m_Recording = WaveNative.waveInAddBuffer(m_WaveIn, ref m_Header, Marshal.SizeOf(m_Header)) == WaveNative.MMSYSERR_NOERROR;
        return m_Recording;
    }
}
public void WaitFor()
{
    if (m_Recording)
        m_Recording = m_RecordEvent.WaitOne();
    else
        Thread.Sleep(0);
}
private void OnCompleted()
{
    m_RecordEvent.Set();
    m_Recording = false;
}