C#中如何使用DirectSound来获取麦克音量

大家好,我最近在做一个程序需要使用DirectSound, 当用户说话时我要开始录音,当用户说完了自动停止录音,然后这样循环下去.

　　现在的问题是如何知道用户是否在说话.请下看下以下代码:

C# code        private void RecordCapturedData()
        {
            byte[] CaptureData = null;
            int ReadPos;
            int CapturePos;
            int LockSize;
            mRecBuffer.GetCurrentPosition(out CapturePos, out ReadPos);
            LockSize = ReadPos - mNextCaptureOffset;
            if (LockSize < 0)
                LockSize += mBufferSize;
            LockSize -= (LockSize % mNotifySize);
            if (0 == LockSize)
                return;
            CaptureData = (byte[])mRecBuffer.Read(mNextCaptureOffset, typeof(byte), LockFlag.None, LockSize);
            mNextCaptureOffset += CaptureData.Length;
            mNextCaptureOffset %= mBufferSize;
            //check state
            if (state == State.Recording || state == State.PreRecording)
            {
                secondBuffer.Add(CaptureData);
            }          
        }

　　上面的代码是C# DirectSound的捕获到数据后的处理方法.也就是说,麦克风得到的信号转换成数字信号,在程序里变为一个byte[]数组放到缓存区,然后我可以一个一个的从缓冲区里得到这个byte[]对象,以前我在这里提问过,一些朋友说计算这个byte[]的平均值或方差可以得到用户说话的音量,可是效果不理想.有时好用有时不好用.

　　所以来到这里请大家帮忙!是否有办法通过计算缓冲区得到的byte[]数据来得到麦克音量,或通过其他API(最好是DirectSound的)能知道用户当前的说话的音量大小.无论你能否帮上忙，先谢谢你!

以下的信息或许会有帮助:

1.我找到的声音探测的软件(含源码)，不过功能太复杂了,不容易分离出来,并且使用的不是DirectSound如果用他的整个程序得重写.
http:-//www.dreamincode-.net/forums/showtopic38890.htm

2.我已经完成的不带自动探测声音的录音的源代码

C# code
public class Recorder
    {
        //由于长度限制,变量略
          public void Initialize()
        {
            // Create capture buffer.
            CreateCaptureBuffer();
            // Create notification system.
            InitNotifications();
            mRecBuffer.Start(true);
        }
        public void Dispose()
        {
            // Close notification
            if (null != mNotificationEvent)
                mNotificationEvent.Set();
            // Stop recording
            mRecBuffer.Stop();
        }
 
      
               #endregion
        #region Initialize Recorder
        public Recorder()
        {
            InitCaptureDevice();
            mWavFormat = CreateWaveFormat();    
            buffDes = new BufferDescription();
            buffDes.GlobalFocus = true;
            buffDes.ControlVolume = true;
            buffDes.ControlPan = true;           
            secDev = new Device();
            bufferStates = new List<int>();
        }
        private void RecordCapturedData()
        {
            byte[] CaptureData = null;
            int ReadPos;
            int CapturePos;
            int LockSize;
            mRecBuffer.GetCurrentPosition(out CapturePos, out ReadPos);
            LockSize = ReadPos - mNextCaptureOffset;
            if (LockSize < 0)
                LockSize += mBufferSize;
            LockSize -= (LockSize % mNotifySize);
            if (0 == LockSize)
                return;
            CaptureData = (byte[])mRecBuffer.Read(mNextCaptureOffset, typeof(byte), LockFlag.None, LockSize);
            mNextCaptureOffset += CaptureData.Length;
            mNextCaptureOffset %= mBufferSize;
            //check state

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