C# 获取wave文件信息【转】

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_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
/// <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
}