C#中使用DirectSound来获取麦克音量,该如何解决

C#中使用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            if (state == State.Recording || state == State.PreRecording)            {                secondBuffer.Add(CaptureData);            }                   }        private void CreateCaptureBuffer()        {            CaptureBufferDescription bufferdescription = new CaptureBufferDescription();            if (null != mNotify)            {                mNotify.Dispose();                mNotify = null;            }            if (null != mRecBuffer)            {                mRecBuffer.Dispose();                mRecBuffer = null;            }            // set notification's size: 1 second            mNotifySize = (1024 > mWavFormat.AverageBytesPerSecond / 8) ? 1024 : (mWavFormat.AverageBytesPerSecond / 8);            mNotifySize -= mNotifySize % mWavFormat.BlockAlign;            // set size of buffer            mBufferSize = mNotifySize * cNotifyNum;            bufferdescription.BufferBytes = mBufferSize;            bufferdescription.Format = mWavFormat;            mRecBuffer = new CaptureBuffer(bufferdescription, mCapDev);            mNextCaptureOffset = 0;        }        private bool InitNotifications()        {            if (null == mRecBuffer)            {                MessageBox.Show("Record buffer is not found!");                return false;            }            mNotificationEvent = new AutoResetEvent(false);            if (null == mNotifyThread)            {                mNotifyThread = new Thread(new ThreadStart(WaitThread));                mNotifyThread.Start();            }            BufferPositionNotify[] PositionNotify = new BufferPositionNotify[cNotifyNum + 1];            for (int i = 0; i < cNotifyNum; i++)            {                PositionNotify[i].Offset = (mNotifySize * i) + mNotifySize - 1;                PositionNotify[i].EventNotifyHandle = mNotificationEvent.Handle;            }            mNotify = new Notify(mRecBuffer);            mNotify.SetNotificationPositions(PositionNotify, cNotifyNum);            return true;        }        private bool InitCaptureDevice()        {            CaptureDevicesCollection devices = new CaptureDevicesCollection();            Guid deviceGuid = Guid.Empty;            if (devices.Count > 0)                deviceGuid = devices[0].DriverGuid;            else            {                MessageBox.Show("No device to capture wave!");                return false;            }            try            {                mCapDev = new Capture(deviceGuid);            }            catch (DirectXException e)            {                MessageBox.Show(e.ToString());                return false;            }            return true;        }        private WaveFormat CreateWaveFormat()        {            WaveFormat format = new WaveFormat();            format.FormatTag = WaveFormatTag.Pcm;   // PCM            format.SamplesPerSecond = 16000;        // 16KHz            format.BitsPerSample = 16;              // 16Bit            format.Channels = 1;                    // Mono            format.BlockAlign = (short)(format.Channels * (format.BitsPerSample / 8));            format.AverageBytesPerSecond = format.BlockAlign * format.SamplesPerSecond;            return format;        }        private void WaitThread()        {            while (true)            {                // waiting for notification                mNotificationEvent.WaitOne(Timeout.Infinite, true);                // process data captured                RecordCapturedData();            }        }        #endregion    } 
 

[解决办法]
友情UP.不会也帮顶.顶到LZ会了为止
[解决办法]
http://dev.yesky.com/386/2252386.shtml
[解决办法]
http://www.cnblogs.com/stg609/archive/2009/03/06/1318931.html

查看更多 下一篇