C#使用MediaInfo查看媒体信息
网上关于MediaInfo相关的使用经验很少，而且官方Demo介绍也只是输出INFO，没有每一项信息的调用参数，今天，将自己总结的经验备份下，省得以后又得找。
1.将MediaInfo.dll放入可执行目录。
2.将官网Demo里的MediaInfoDLL.cs放入项目中。
View MediaInfoDLL.cs Code
1 using System; 2 using System.Runtime.InteropServices; 3 4 namespace PlayVideoTest 5 { 6 public enum StreamKind 7 { 8 General, 9 Video, 10 Audio, 11 Text, 12 Chapters, 13 Image 14 } 15 16 public enum InfoKind 17 { 18 Name, 19 Text, 20 Measure, 21 Options, 22 NameText, 23 MeasureText, 24 Info, 25 HowTo 26 } 27 28 public enum InfoOptions 29 { 30 ShowInInform, 31 Support, 32 ShowInSupported, 33 TypeOfValue 34 } 35 36 public enum InfoFileOptions 37 { 38 FileOption_Nothing = 0x00, 39 FileOption_NoRecursive = 0x01, 40 FileOption_CloseAll = 0x02, 41 FileOption_Max = 0x04 42 }; 43 44 45 public class MediaInfo 46 { 47 //Import of DLL functions. DO NOT USE until you know what you do (MediaInfo DLL do NOT use CoTaskMemAlloc to allocate memory) 48 [DllImport("MediaInfo.dll")] 49 private static extern IntPtr MediaInfo_New(); 50 [DllImport("MediaInfo.dll")] 51 private static extern void MediaInfo_Delete(IntPtr Handle); 52 [DllImport("MediaInfo.dll")] 53 private static extern IntPtr MediaInfo_Open(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string FileName); 54 [DllImport("MediaInfo.dll")] 55 private static extern IntPtr MediaInfoA_Open(IntPtr Handle, IntPtr FileName); 56 [DllImport("MediaInfo.dll")] 57 private static extern IntPtr MediaInfo_Open_Buffer_Init(IntPtr Handle, Int64 File_Size, Int64 File_Offset); 58 [DllImport("MediaInfo.dll")] 59 private static extern IntPtr MediaInfoA_Open(IntPtr Handle, Int64 File_Size, Int64 File_Offset); 60 [DllImport("MediaInfo.dll")] 61 private static extern IntPtr MediaInfo_Open_Buffer_Continue(IntPtr Handle, IntPtr Buffer, IntPtr Buffer_Size); 62 [DllImport("MediaInfo.dll")] 63 private static extern IntPtr MediaInfoA_Open_Buffer_Continue(IntPtr Handle, Int64 File_Size, byte[] Buffer, IntPtr Buffer_Size); 64 [DllImport("MediaInfo.dll")] 65 private static extern Int64 MediaInfo_Open_Buffer_Continue_GoTo_Get(IntPtr Handle); 66 [DllImport("MediaInfo.dll")] 67 private static extern Int64 MediaInfoA_Open_Buffer_Continue_GoTo_Get(IntPtr Handle); 68 [DllImport("MediaInfo.dll")] 69 private static extern IntPtr MediaInfo_Open_Buffer_Finalize(IntPtr Handle); 70 [DllImport("MediaInfo.dll")] 71 private static extern IntPtr MediaInfoA_Open_Buffer_Finalize(IntPtr Handle); 72 [DllImport("MediaInfo.dll")] 73 private static extern void MediaInfo_Close(IntPtr Handle); 74 [DllImport("MediaInfo.dll")] 75 private static extern IntPtr MediaInfo_Inform(IntPtr Handle, IntPtr Reserved); 76 [DllImport("MediaInfo.dll")] 77 private static extern IntPtr MediaInfoA_Inform(IntPtr Handle, IntPtr Reserved); 78 [DllImport("MediaInfo.dll")] 79 private static extern IntPtr MediaInfo_GetI(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo); 80 [DllImport("MediaInfo.dll")] 81 private static extern IntPtr MediaInfoA_GetI(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo); 82 [DllImport("MediaInfo.dll")] 83 private static extern IntPtr MediaInfo_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, [MarshalAs(UnmanagedType.LPWStr)] string Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch); 84 [DllImport("MediaInfo.dll")] 85 private static extern IntPtr MediaInfoA_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch); 86 [DllImport("MediaInfo.dll")] 87 private static extern IntPtr MediaInfo_Option(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string Option, [MarshalAs(UnmanagedType.LPWStr)] string Value); 88 [DllImport("MediaInfo.dll")] 89 private static extern IntPtr MediaInfoA_Option(IntPtr Handle, IntPtr Option, IntPtr Value); 90 [DllImport("MediaInfo.dll")] 91 private static extern IntPtr MediaInfo_State_Get(IntPtr Handle); 92 [DllImport("MediaInfo.dll")] 93 private static extern IntPtr MediaInfo_Count_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber); 94 95 //MediaInfo class 96 public MediaInfo() 97 { 98 Handle = MediaInfo_New(); 99 if (Environment.OSVersion.ToString().IndexOf("Windows")==-1) 100 MustUseAnsi=true; 101 else 102 MustUseAnsi=false; 103 } 104 ~MediaInfo() { MediaInfo_Delete(Handle); } 105 public int Open(String FileName) 106 { 107 if (MustUseAnsi) 108 { 109 IntPtr FileName_Ptr = Marshal.StringToHGlobalAnsi(FileName); 110 int ToReturn = (int)MediaInfoA_Open(Handle, FileName_Ptr); 111 Marshal.FreeHGlobal(FileName_Ptr); 112 return ToReturn; 113 } 114 else 115 return (int)MediaInfo_Open(Handle, FileName); 116 } 117 public int Open_Buffer_Init(Int64 File_Size, Int64 File_Offset) 118 { 119 return (int)MediaInfo_Open_Buffer_Init(Handle, File_Size, File_Offset); 120 } 121 public int Open_Buffer_Continue(IntPtr Buffer, IntPtr Buffer_Size) 122 { 123 return (int)MediaInfo_Open_Buffer_Continue(Handle, Buffer, Buffer_Size); 124 } 125 public Int64 Open_Buffer_Continue_GoTo_Get() 126 { 127 return (int)MediaInfo_Open_Buffer_Continue_GoTo_Get(Handle); 128 } 129 public int Open_Buffer_Finalize() 130 { 131 return (int)MediaInfo_Open_Buffer_Finalize(Handle); 132 } 133 public void Close() { MediaInfo_Close(Handle); } 134 public String Inform() 135 { 136 if (MustUseAnsi) 137 return Marshal.PtrToStringAnsi(MediaInfoA_Inform(Handle, (IntPtr)0)); 138 else 139 return Marshal.PtrToStringUni(MediaInfo_Inform(Handle, (IntPtr)0)); 140 } 141 public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo, InfoKind KindOfSearch) 142 { 143 if (MustUseAnsi) 144 { 145 IntPtr Parameter_Ptr=Marshal.StringToHGlobalAnsi(Parameter); 146 String ToReturn=Marshal.PtrToStringAnsi(MediaInfoA_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter_Ptr, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch)); 147 Marshal.FreeHGlobal(Parameter_Ptr); 148 return ToReturn; 149 } 150 else 151 return Marshal.PtrToStringUni(MediaInfo_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch)); 152 } 153 public String Get(StreamKind StreamKind, int StreamNumber, int Parameter, InfoKind KindOfInfo) 154 { 155 if (MustUseAnsi) 156 return Marshal.PtrToStringAnsi(MediaInfoA_GetI(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo)); 157 else 158 return Marshal.PtrToStringUni(MediaInfo_GetI(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo)); 159 } 160 public String Option(String Option, String Value) 161 { 162 if (MustUseAnsi) 163 { 164 IntPtr Option_Ptr=Marshal.StringToHGlobalAnsi(Option); 165 IntPtr Value_Ptr=Marshal.StringToHGlobalAnsi(Value); 166 String ToReturn=Marshal.PtrToStringAnsi(MediaInfoA_Option(Handle, Option_Ptr, Value_Ptr)); 167 Marshal.FreeHGlobal(Option_Ptr); 168 Marshal.FreeHGlobal(Value_Ptr); 169 return ToReturn; 170 } 171 else 172 return Marshal.PtrToStringUni(MediaInfo_Option(Handle, Option, Value)); 173 } 174 public int State_Get() { return (int)MediaInfo_State_Get(Handle); } 175 public int Count_Get(StreamKind StreamKind, int StreamNumber) { return (int)MediaInfo_Count_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber); } 176 private IntPtr Handle; 177 private bool MustUseAnsi; 178 179 //Default values, if you know how to set default values in C#, say me 180 public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo) { return Get(StreamKind, StreamNumber, Parameter, KindOfInfo, InfoKind.Name); } 181 public String Get(StreamKind StreamKind, int StreamNumber, String Parameter) { return Get(StreamKind, StreamNumber, Parameter, InfoKind.Text, InfoKind.Name); } 182 public String Get(StreamKind StreamKind, int StreamNumber, int Parameter) { return Get(StreamKind, StreamNumber, Parameter, InfoKind.Text); } 183 public String Option(String Option_) { return Option(Option_, ""); } 184 public int Count_Get(StreamKind StreamKind) { return Count_Get(StreamKind, -1); } 185 } 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 public class MediaInfoList 204 { 205 //Import of DLL functions. DO NOT USE until you know what you do (MediaInfo DLL do NOT use CoTaskMemAlloc to allocate memory) 206 [DllImport("MediaInfo.dll")] 207 private static extern IntPtr MediaInfoList_New(); 208 [DllImport("MediaInfo.dll")] 209 private static extern void MediaInfoList_Delete(IntPtr Handle); 210 [DllImport("MediaInfo.dll")] 211 private static extern IntPtr MediaInfoList_Open(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string FileName, IntPtr Options); 212 [DllImport("MediaInfo.dll")] 213 private static extern void MediaInfoList_Close(IntPtr Handle, IntPtr FilePos); 214 [DllImport("MediaInfo.dll")] 215 private static extern IntPtr MediaInfoList_Inform(IntPtr Handle, IntPtr FilePos, IntPtr Reserved); 216 [DllImport("MediaInfo.dll")] 217 private static extern IntPtr MediaInfoList_GetI(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo); 218 [DllImport("MediaInfo.dll")] 219 private static extern IntPtr MediaInfoList_Get(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber, [MarshalAs(UnmanagedType.LPWStr)] string Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch); 220 [DllImport("MediaInfo.dll")] 221 private static extern IntPtr MediaInfoList_Option(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string Option, [MarshalAs(UnmanagedType.LPWStr)] string Value); 222 [DllImport("MediaInfo.dll")] 223 private static extern IntPtr MediaInfoList_State_Get(IntPtr Handle); 224 [DllImport("MediaInfo.dll")] 225 private static extern IntPtr MediaInfoList_Count_Get(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber); 226 227 //MediaInfo class 228 public MediaInfoList() { Handle = MediaInfoList_New(); } 229 ~MediaInfoList() { MediaInfoList_Delete(Handle); } 230 public int Open(String FileName, InfoFileOptions Options) { return (int)MediaInfoList_Open(Handle, FileName, (IntPtr)Options); } 231 public void Close(int FilePos) { MediaInfoList_Close(Handle, (IntPtr)FilePos); } 232 public String Inform(int FilePos) { return Marshal.PtrToStringUni(MediaInfoList_Inform(Handle, (IntPtr)FilePos, (IntPtr)0)); } 233 public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo, InfoKind KindOfSearch) { return Marshal.PtrToStringUni(MediaInfoList_Get(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch)); } 234 public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, int Parameter, InfoKind KindOfInfo) { return Marshal.PtrToStringUni(MediaInfoList_GetI(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo)); } 235 public String Option(String Option, String Value) { return Marshal.PtrToStringUni(MediaInfoList_Option(Handle, Option, Value)); } 236 public int State_Get() { return (int)MediaInfoList_State_Get(Handle); } 237 public int Count_Get(int FilePos, StreamKind StreamKind, int StreamNumber) { return (int)MediaInfoList_Count_Get(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber); } 238 private IntPtr Handle; 239 240 //Default values, if you know how to set default values in C#, say me 241 public void Open(String FileName) { Open(FileName, 0); } 242 public void Close() { Close(-1); } 243 public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo) { return Get(FilePos, StreamKind, StreamNumber, Parameter, KindOfInfo, InfoKind.Name); } 244 public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter) { return Get(FilePos, StreamKind, StreamNumber, Parameter, InfoKind.Text, InfoKind.Name); } 245 public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, int Parameter) { return Get(FilePos, StreamKind, StreamNumber, Parameter, InfoKind.Text); } 246 public String Option(String Option_) { return Option(Option_, ""); } 247 public int Count_Get(int FilePos, StreamKind StreamKind) { return Count_Get(FilePos, StreamKind, -1); } 248 } 249 250 } //NameSpace
3.接下来是调用了。
1 public bool LoadVideoInfo() 2{ 3 MediaInfo MI = new MediaInfo(); 4 MI.Open("C:\\test.avi"); 5 string width =Convert.ToInt32(MI.Get(StreamKind.Video, 0, "Width"));//视频width 6 string height =Convert.ToInt32(MI.Get(StreamKind.Video, 0, "Height")); 7 MI.Close(); 8 }
由MI.Get(StreamKind.Video, 0, "Width")这个函数调用方式可知，我们想查询视频宽度，直接使用width参数就行了，但是视频、音频有大量的参数，我们不可以都猜的到，网上反正我没找到这些参数的介绍，幸好找到了一个方法可以把这些方法遍历出来，参数出来了，就好办了，不明白意思的话google下，基本上就可以把全部参数弄懂了。
1 // 遍历Video所有可有参数 2 //如果要遍历Audio的参数，StreamKind.Video换成StreamKind.Audio即可，General同理。 3 string parameter="";//存放所有参数 4 string tempstr;int i=0; 5 while (true) 6 { 7 tempstr = MI.Get(StreamKind.Video, 0, i++, InfoKind.Name); 8 if (tempstr == "") 9 { 10 break; 11 } 12 parameter += "\r\n" + tempstr; 13 }