1 using System;
  2
  3 using System.Collections.Generic;
  4
  5 using System.Linq;
  6
  7 using System.Text;
  8
  9 using System.IO;
 10
 11 namespace _30edu.Common
 12
 13 {
 14
 15     public class FlvInfo
 16
 17     {
 18
 19         public FlvInfo()
 20
 21         {
 22
 23             Header = new FLVHeader();
 24
 25             TagList = new List<FLVTag>();
 26
 27         }
 28
 29         public FLVHeader Header { get;private set; }
 30
 31         public List<FLVTag> TagList { get; private set; }
 32
 33         public TimeSpan Time
 34
 35         {
 36
 37             get
 38
 39             {
 40
 41                 int time=0;
 42
 43                 //foreach (FLVTag tag in this.TagList.Where(p=>p.Type))
 44
 45                 //{
 46                 //    byte[] tmp = new byte[4];
 47
 48                 //    tmp[3] = tag.TimeEx;
 49
 50                 //    tmp[0] = tag.Time[2];
 51
 52                 //    tmp[1] = tag.Time[1];
 53
 54                 //    tmp[2] = tag.Time[0];
 55
 56                 //    time += BitConverter.ToInt32(tmp,0);
 57
 58                 //}
 59
 60                 FLVTag tag = this.TagList.Where(p => p.Type == 9).Last();
 61
 62                 byte[] tmp = new byte[4];
 63
 64                 tmp[3] = tag.TimeEx;
 65
 66                 tmp[0] = tag.Time[2];
 67
 68                 tmp[1] = tag.Time[1];
 69
 70                 tmp[2] = tag.Time[0];
 71
 72                 return new TimeSpan(0, 0, 0, 0, BitConverter.ToInt32(tmp, 0));
 73
 74             }
 75
 76         }
 77
 78     }
 79
 80     /**//// <summary>
 81
 82     /// 文件头
 83
 84     /// </summary>
 85
 86     public class FLVHeader
 87
 88     {
 89
 90         public FLVHeader()
 91
 92         {
 93
 94             this.Type = new byte[3];
 95
 96             this.Length = new byte[4];
 97
 98         }
 99
100         /**//// <summary>
101
102         /// 3byte 总是FLV（0x46 0x4C 0x56）
103
104         /// </summary>
105
106         public byte[] Type { get; set; }
107
108         /**//// <summary>
109
110         /// 版本 一般是0x01，表示FLV version 1
111
112         /// </summary>
113
114         public byte Version{ get; set; }
115
116         /**//// <summary>
117
118         /// 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
119
120         /// </summary>
121
122         public byte Stream { get; set; }
123
124         /**//// <summary>
125
126         /// 长度 4byte
127
128         /// </summary>
129
130         public byte[] Length { get; set; }
131
132     }
133
134     public class FLVTag
135
136     {
137
138         public FLVTag()
139
140         {
141
142             this.PreviousTagSize = new byte[4];
143
144             this.DataLength = new byte[3];
145
146             this.Time = new byte[3];
147
148             this.streamsID = new byte[3];
149
150         }
151
152         /**//// <summary>
153
154         /// 前一个Tag长度 4byte
155
156         /// </summary>
157
158         public byte[] PreviousTagSize { get; set; }
159
160         /**//// <summary>
161
162         ///  8 -- 音频tag 9 -- 视频tag 18 -- 脚本tag
163
164         /// </summary>
165
166         public byte Type { get; set; }
167
168         /**//// <summary>
169
170         /// 数据区长度 3byte
171
172         /// </summary>
173
174         public byte[] DataLength { get; set; }
175
176         /**//// <summary>
177
178         /// 时间戳 3byte 毫秒
179
180         /// </summary>
181
182         public byte[] Time { get; set; }
183
184         /**//// <summary>
185
186         /// 扩展时间戳 3byte 毫秒 作为时间戳的高位
187
188         /// </summary>
189
190         public byte TimeEx { get; set; }
191
192         /**//// <summary>
193
194         /// 一般为0 3byte
195
196         /// </summary>
197
198         public byte[] streamsID { get; set; }
199
200         /**//// <summary>
201
202         ///
203         /// </summary>
204
205         public byte[] Data { get; set; }
206
207     }
208
209     public static class FlvInfoHelper
210
211     {
212
213         public static FlvInfo Read(string Path)
214
215         {
216
217             using (FileStream fs = File.OpenRead(Path))
218
219             {
220
221                 FlvInfo aFlvInfo = new FlvInfo();
222
223                 fs.Read(aFlvInfo.Header.Type, 0, aFlvInfo.Header.Type.Length);
224
225                 aFlvInfo.Header.Version=(byte)fs.ReadByte();
226
227                 aFlvInfo.Header.Stream = (byte)fs.ReadByte();
228
229                 fs.Read(aFlvInfo.Header.Length, 0, aFlvInfo.Header.Length.Length);
230
231                 byte[] previoustagsize=new byte[4];
232
233                 while (fs.Read(previoustagsize, 0, previoustagsize.Length) != 0)
234
235                 {
236
237                     FLVTag Tag = new FLVTag();
238
239                     Tag.PreviousTagSize = previoustagsize;
240
241                     Tag.Type = (byte)fs.ReadByte();
242
243                     fs.Read(Tag.DataLength, 0, Tag.DataLength.Length);
244
245                     fs.Read(Tag.Time, 0, Tag.Time.Length);
246
247                     Tag.TimeEx = (byte)fs.ReadByte();
248
249                     fs.Read(Tag.streamsID, 0, Tag.streamsID.Length);
250
251                     byte[] tmp = new byte[4];
252
253                     tmp[3] = 0;
254
255                     tmp[2] = Tag.DataLength[0];
256
257                     tmp[1] = Tag.DataLength[1];
258
259                     tmp[0] = Tag.DataLength[2];
260
261                     int n=System.BitConverter.ToInt32(tmp, 0);
262
263                     fs.Seek(n, SeekOrigin.Current);
264
265                     aFlvInfo.TagList.Add(Tag);
266
267                 }
268
269                 return aFlvInfo;
270
271             }
272
273             return null;
274
275         }
276
277     }
278
279 }
280