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