public class WaveHelper    {        /// 
        /// 数据流        /// 
        private Stream m_WaveData;        private bool m_WaveBool = false;        private RIFF_WAVE_Chunk _Header = new RIFF_WAVE_Chunk();        private Format_Chunk _Format = new Format_Chunk();        private Fact_Chunk _Fact = new Fact_Chunk();        private Data_Chunk _Data = new Data_Chunk();        public WaveHelper(string WaveFileName)        {            m_WaveData = new FileStream(WaveFileName, FileMode.Open);            try            {                LoadWave();                m_WaveData.Close();            }            catch            {                m_WaveData.Close();            }        }        public WaveHelper(Stream WaveStream)        {            m_WaveData = WaveStream;            try            {                LoadWave();                m_WaveData.Close();            }            catch            {                m_WaveData.Close();            }        }        private void LoadWave()        {            #region RIFF_WAVE_Chunk            byte[] _Temp4 = new byte[4];            byte[] _Temp2 = new byte[2];            m_WaveData.Read(_Temp4, 0, 4);            if (_Temp4[0] != _Header.szRiffID[0] || _Temp4[1] != _Header.szRiffID[1] || _Temp4[2] != _Header.szRiffID[2] || _Temp4[3] != _Header.szRiffID[3]) return;            m_WaveData.Read(_Temp4, 0, 4);            _Header.dwRiffSize = BitConverter.ToUInt32(_Temp4, 0);            m_WaveData.Read(_Temp4, 0, 4);            if (_Temp4[0] != _Header.szRiffFormat[0] || _Temp4[1] != _Header.szRiffFormat[1] || _Temp4[2] != _Header.szRiffFormat[2] || _Temp4[3] != _Header.szRiffFormat[3]) return;            #endregion            #region Format_Chunk            m_WaveData.Read(_Temp4, 0, 4);            if (_Temp4[0] != _Format.ID[0] || _Temp4[1] != _Format.ID[1] || _Temp4[2] != _Format.ID[2]) return;            m_WaveData.Read(_Temp4, 0, 4);            _Format.Size = BitConverter.ToUInt32(_Temp4, 0);            long _EndWave = _Format.Size + m_WaveData.Position;            m_WaveData.Read(_Temp2, 0, 2);            _Format.FormatTag = BitConverter.ToUInt16(_Temp2, 0);            m_WaveData.Read(_Temp2, 0, 2);            _Format.Channels = BitConverter.ToUInt16(_Temp2, 0);            m_WaveData.Read(_Temp4, 0, 4);            _Format.SamlesPerSec = BitConverter.ToUInt32(_Temp4, 0);            m_WaveData.Read(_Temp4, 0, 4);            _Format.AvgBytesPerSec = BitConverter.ToUInt32(_Temp4, 0);            m_WaveData.Read(_Temp2, 0, 2);            _Format.BlockAlign = BitConverter.ToUInt16(_Temp2, 0);            m_WaveData.Read(_Temp2, 0, 2);            _Format.BitsPerSample = BitConverter.ToUInt16(_Temp2, 0);            m_WaveData.Position += _EndWave - m_WaveData.Position;            #endregion            m_WaveData.Read(_Temp4, 0, 4);            if (_Temp4[0] == _Fact.ID[0] && _Temp4[1] == _Fact.ID[1] && _Temp4[2] == _Fact.ID[2] && _Temp4[3] == _Fact.ID[3])            {                #region  Fact_Chunk                m_WaveData.Read(_Temp4, 0, 4);                _Fact.Size = BitConverter.ToUInt32(_Temp4, 0);                m_WaveData.Position += _Fact.Size;                #endregion                m_WaveData.Read(_Temp4, 0, 4);            }            if (_Temp4[0] == _Data.ID[0] && _Temp4[1] == _Data.ID[1] && _Temp4[2] == _Data.ID[2] && _Temp4[3] == _Data.ID[3])            {                #region Data_Chunk                m_WaveData.Read(_Temp4, 0, 4);                _Data.Size = BitConverter.ToUInt32(_Temp4, 0);                _Data.FileBeginIndex = m_WaveData.Position;                _Data.FileOverIndex = m_WaveData.Position + _Data.Size;                m_Second = (double)_Data.Size / (double)_Format.AvgBytesPerSec;                #endregion            }            m_WaveBool = true;        }        #region 文件定义        /// 
        /// 文件头        /// 
        private class RIFF_WAVE_Chunk        {            /// 
            /// 文件前四个字节 为RIFF            /// 
            public byte[] szRiffID = new byte[] { 0x52, 0x49, 0x46, 0x46 };   // 'R','I','F','F'            /// 
            /// 数据大小 这个数字等于+8 =文件大小            /// 
            public uint dwRiffSize = 0;            /// 
            ///WAVE文件定义 为WAVE            /// 
            public byte[] szRiffFormat = new byte[] { 0x57, 0x41, 0x56, 0x45 }; // 'W','A','V','E'                 }        /// 
        /// 声音内容定义        /// 
        private class Format_Chunk        {            /// 
            /// 固定为  是"fmt "字后一位为0x20            /// 
            public byte[] ID = new byte[] { 0x66, 0x6D, 0x74, 0x20 };            /// 
            /// 区域大小            /// 
            public uint Size = 0;            /// 
            /// 记录着此声音的格式代号，例如1-WAVE_FORMAT_PCM， 2-WAVE_F0RAM_ADPCM等等。             /// 
            public ushort FormatTag = 1;            /// 
            /// 声道数目，1--单声道；2--双声道            /// 
            public ushort Channels = 2;            /// 
            /// 采样频率  一般有11025Hz（11kHz）、22050Hz（22kHz）和44100Hz（44kHz）三种            /// 
            public uint SamlesPerSec = 0;            /// 
            /// 每秒所需字节数            /// 
            public uint AvgBytesPerSec = 0;            /// 
            /// 数据块对齐单位(每个采样需要的字节数)            /// 
            public ushort BlockAlign = 0;            /// 
            /// 音频采样大小             /// 
            public ushort BitsPerSample = 0;            /// 
            /// ???            /// 
            public byte[] Temp = new byte[2];        }        /// 
        /// FACT        /// 
        private class Fact_Chunk        {            /// 
            /// 文件前四个字节 为fact            /// 
            public byte[] ID = new byte[] { 0x66, 0x61, 0x63, 0x74 };   // 'f','a','c','t'            /// 
            /// 数据大小            /// 
            public uint Size = 0;            /// 
            /// 临时数据            /// 
            public byte[] Temp;        }        /// 
        /// 数据区        /// 
        private class Data_Chunk        {            /// 
            /// 文件前四个字节 为RIFF            /// 
            public byte[] ID = new byte[] { 0x64, 0x61, 0x74, 0x61 };   // 'd','a','t','a'            /// 
            /// 大小            /// 
            public uint Size = 0;            /// 
            /// 开始播放的位置            /// 
            public long FileBeginIndex = 0;            /// 
            /// 结束播放的位置            /// 
            public long FileOverIndex = 0;        }        #endregion        #region 属性        /// 
        /// 是否成功打开文件        /// 
        public bool WaveBool { get { return m_WaveBool; } }        private double m_Second = 0;        /// 
        /// 秒单位        /// 
        public double Second { get { return m_Second; } }        /// 
        /// 格式        /// 
        public string FormatTag        {            get            {                switch (_Format.FormatTag)                {                    case 1:                        return "PCM";                    case 2:                        return "Microsoft ADPCM";                    default:                        return "Un";                }            }        }        /// 
        /// 频道        /// 
        public ushort Channels { get { return _Format.Channels; } }        /// 
        /// 采样级别        /// 
        public string SamlesPerSec        {            get            {                //switch (_Format.SamlesPerSec)                //{                //    case 11025:                //        return "11kHz";                //    case 22050:                //        return "22kHz";                //    case 44100:                //        return "44kHz";                //    default:                //        return _Format.SamlesPerSec.ToString() + "Hz";                //}                return _Format.SamlesPerSec.ToString();            }        }        /// 
        /// 采样大小(比特率)        /// 
        public ushort BitsPerSample { get { return _Format.BitsPerSample; } }        #endregion    }