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using System;  

using System.Collections.Generic;  

using System.Text;  

using System.IO;  



namespace VideoInfo  

{  

public class FlvInfo  

{  

public FlvInfo()  

{  

Header = new FLVHeader();  

TagList = new List<FLVTag>();  

}  

public FLVHeader Header;  

public List<FLVTag> TagList;  

public TimeSpan Time  

{  

get  

{  

int time = 0;  

FLVTag tag = new FLVTag(); ;  

foreach (FLVTag _tag in this.TagList)  

{  

if (_tag.Type == 9)  

{  

tag = _tag;  

}  

}  

byte[] tmp = new byte[4];  

tmp[3] = tag.TimeEx;  

tmp[0] = tag.Time[2];  

tmp[1] = tag.Time[1];  

tmp[2] = tag.Time[0];  

return new TimeSpan(0, 0, 0, 0, BitConverter.ToInt32(tmp, 0));  

}  

}  

}  



/**/  

/// <summary>  

/// 文件头  

/// </summary>  

public class FLVHeader  

{  

public FLVHeader()  

{  

this.Type = new byte[3];  

this.Length = new byte[4];  

}  

/**/  

/// <summary>  

/// 3byte 总是FLV（0x46 0x4C 0x56）  

/// </summary>  

public byte[] Type;  

/**/  

/// <summary>  

/// 版本 一般是0x01，表示FLV version 1  

/// </summary>  

public byte Version;  



/**/  

/// <summary>  

/// 流信息 倒数第一bit是1表示有视频，倒数第三bit是1表示有音频  

/// </summary>  

public byte Stream;  



/**/  

/// <summary>  

/// 长度 4byte  

/// </summary>  

public byte[] Length;  

}  



public class FLVTag  

{  

public FLVTag()  

{  

this.PreviousTagSize = new byte[4];  

this.DataLength = new byte[3];  

this.Time = new byte[3];  

this.streamsID = new byte[3];  



}  

/**/  

/// <summary>  

/// 前一个Tag长度 4byte  

/// </summary>  

public byte[] PreviousTagSize;  

/**/  

/// <summary>  

/// 8 -- 音频tag 9 -- 视频tag 18 -- 脚本tag  

/// </summary>  

public byte Type;  



/**/  

/// <summary>  

/// 数据区长度 3byte  

/// </summary>  

public byte[] DataLength;  



/**/  

/// <summary>  

/// 时间戳 3byte 毫秒  

/// </summary>  

public byte[] Time;  



/**/  

/// <summary>  

/// 扩展时间戳 3byte 毫秒 作为时间戳的高位  

/// </summary>  

public byte TimeEx;  



/**/  

/// <summary>  

/// 一般为0 3byte  

/// </summary>  

public byte[] streamsID;  



/**/  

/// <summary>  

///  

/// </summary>  

public byte[] Data;  

}  



public static class FlvInfoHelper  

{  

public static FlvInfo Read(string Path)  

{  

using (FileStream fs = File.OpenRead(Path))  

{  

FlvInfo aFlvInfo = new FlvInfo();  

fs.Read(aFlvInfo.Header.Type, 0, aFlvInfo.Header.Type.Length);  

aFlvInfo.Header.Version = (byte)fs.ReadByte();  

aFlvInfo.Header.Stream = (byte)fs.ReadByte();  

fs.Read(aFlvInfo.Header.Length, 0, aFlvInfo.Header.Length.Length);  

byte[] previoustagsize = new byte[4];  

while (fs.Read(previoustagsize, 0, previoustagsize.Length) != 0)  

{  

FLVTag Tag = new FLVTag();  

Tag.PreviousTagSize = previoustagsize;  

Tag.Type = (byte)fs.ReadByte();  

fs.Read(Tag.DataLength, 0, Tag.DataLength.Length);  

fs.Read(Tag.Time, 0, Tag.Time.Length);  

Tag.TimeEx = (byte)fs.ReadByte();  

fs.Read(Tag.streamsID, 0, Tag.streamsID.Length);  



byte[] tmp = new byte[4];  

tmp[3] = 0;  

tmp[2] = Tag.DataLength[0];  

tmp[1] = Tag.DataLength[1];  

tmp[0] = Tag.DataLength[2];  

int n = System.BitConverter.ToInt32(tmp, 0);  

fs.Seek(n, SeekOrigin.Current);  

aFlvInfo.TagList.Add(Tag);  



}  

return aFlvInfo;  

}  

return null;  

}  

}  



}