asp.net c# wave文件分析

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;

public partial class admin_Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    public struct WavInfo
    {
        public string groupid;
        public string rifftype;
        public long filesize;
        public string chunkid;
        public long chunksize;
        public short wformattag; //记录着此声音的格式代号，例如WAVE_FORMAT_PCM，WAVE_F0RAM_ADPCM等等。
        public ushort wchannels; //记录声音的频道数。
        public ulong dwsamplespersec;//记录每秒取样数。
        public ulong dwavgbytespersec;//记录每秒的数据量。
        public ushort wblockalign;//记录区块的对齐单位。
        public ushort wbitspersample;//记录每个取样所需的位元数。
        public string datachunkid;
        public long datasize;
    }
    public static void GetWavInfo(string strpath)
    {
        WavInfo wavInfo = new WavInfo();
        FileInfo fi = new FileInfo(strpath);
        System.IO.FileStream fs = fi.OpenRead();
        if (fs.Length >= 44)
        {
            byte[] bInfo = new byte[44];
            fs.Read(bInfo, 0, 44);
            System.Text.Encoding.Default.GetString(bInfo, 0, 4);
            if (System.Text.Encoding.Default.GetString(bInfo, 0, 4) == "RIFF" && System.Text.Encoding.Default.GetString(bInfo, 8, 4) == "WAVE" && System.Text.Encoding.Default.GetString(bInfo, 12, 4) == "fmt ")
            {
                wavInfo.groupid = System.Text.Encoding.Default.GetString(bInfo, 0, 4);
                BitConverter.ToInt32(bInfo, 4);
                wavInfo.filesize = BitConverter.ToInt32(bInfo, 4);
                wavInfo.rifftype = System.Text.Encoding.Default.GetString(bInfo, 8, 4);
                wavInfo.chunkid = System.Text.Encoding.Default.GetString(bInfo, 12, 4);
                wavInfo.chunksize = BitConverter.ToInt32(bInfo, 16);
                wavInfo.wformattag = BitConverter.ToInt16(bInfo, 20);
                wavInfo.wchannels = BitConverter.ToUInt16(bInfo, 22);
                wavInfo.dwsamplespersec = BitConverter.ToUInt32(bInfo, 24);
                wavInfo.dwavgbytespersec = BitConverter.ToUInt32(bInfo, 28);
                wavInfo.wblockalign = BitConverter.ToUInt16(bInfo, 32);
                wavInfo.wbitspersample = BitConverter.ToUInt16(bInfo, 34);
                wavInfo.datachunkid = System.Text.Encoding.Default.GetString(bInfo, 36, 4);
                wavInfo.datasize = BitConverter.ToInt32(bInfo, 40);

                Console.WriteLine("groupid:" + wavInfo.groupid);
                Console.WriteLine("filesize:" + wavInfo.filesize);
                Console.WriteLine("rifftype:" + wavInfo.rifftype);
                Console.WriteLine("chunkid:" + wavInfo.chunkid);
                Console.WriteLine("chunksize:" + wavInfo.chunksize);
                Console.WriteLine("wformattag:" + wavInfo.wformattag);
                Console.WriteLine("wchannels:" + wavInfo.wchannels);
                Console.WriteLine("dwsamplespersec:" + wavInfo.dwsamplespersec);
                Console.WriteLine("dwavgbytespersec:" + wavInfo.dwavgbytespersec);
                Console.WriteLine("wblockalign:" + wavInfo.wblockalign);
                Console.WriteLine("wbitspersample:" + wavInfo.wbitspersample);
                Console.WriteLine("datachunkid:" + wavInfo.datachunkid);
                Console.WriteLine("datasize:" + wavInfo.datasize);
            }
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        GetWavInfo(FileUpload1.PostedFile.FileName);
    }
}
//BitConverter.ToInt16(bInfo, 20) == 1 //pcm

//BitConverter.ToInt16(bInfo, 20) == 6 // CCITT A-Law