diff --git a/util/flv.cpp b/util/flv.cpp
index c04d977a..8780077d 100644
--- a/util/flv.cpp
+++ b/util/flv.cpp
@@ -1,12 +1,6 @@
 #include <unistd.h> //for read()
 #include <fcntl.h>
-
-struct FLV_Pack {
-  int len;
-  int buf;
-  bool isKeyframe;
-  char * data;
-};//FLV_Pack
+#include "flv_pack.cpp"
 
 char FLVHeader[13];
 bool All_Hell_Broke_Loose = false;
diff --git a/util/flv_data.cpp b/util/flv_data.cpp
index 28a18da4..ac176ee5 100644
--- a/util/flv_data.cpp
+++ b/util/flv_data.cpp
@@ -1,12 +1,6 @@
 #include <unistd.h> //for read()
 #include <fcntl.h>
-
-struct FLV_Pack {
-  int len;
-  int buf;
-  bool isKeyframe;
-  char * data;
-};//FLV_Pack
+#include "flv_pack.cpp"
 
 char FLVHeader[13];
 bool All_Hell_Broke_Loose = false;
diff --git a/util/flv_pack.cpp b/util/flv_pack.cpp
new file mode 100644
index 00000000..a60bf6a5
--- /dev/null
+++ b/util/flv_pack.cpp
@@ -0,0 +1,123 @@
+#pragma once
+
+class FLV_Pack {
+  public:
+    int len;
+    int buf;
+    bool isKeyframe;
+    char * data;
+    std::string tagType(){
+      std::string R = "";
+      switch (data[0]){
+        case 0x09:
+          switch (data[11] & 0x0F){
+            case 1: R += "JPEG"; break;
+            case 2: R += "H263"; break;
+            case 3: R += "ScreenVideo1"; break;
+            case 4: R += "VP6"; break;
+            case 5: R += "VP6Alpha"; break;
+            case 6: R += "ScreenVideo2"; break;
+            case 7: R += "AVC"; break;
+            default: R += "unknown"; break;
+          }
+          R += " video ";
+          switch (data[11] & 0xF0){
+            case 0x10: R += "keyframe"; break;
+            case 0x20: R += "iframe"; break;
+            case 0x30: R += "disposableiframe"; break;
+            case 0x40: R += "generatedkeyframe"; break;
+            case 0x50: R += "videoinfo"; break;
+          }
+          if ((data[11] & 0x0F) == 7){
+            switch (data[12]){
+              case 0: R += " header"; break;
+              case 1: R += " NALU"; break;
+              case 2: R += " endofsequence"; break;
+            }
+          }
+          break;
+        case 0x08:
+          switch (data[11] & 0xF0){
+            case 0x00: R += "linear PCM PE"; break;
+            case 0x10: R += "ADPCM"; break;
+            case 0x20: R += "MP3"; break;
+            case 0x30: R += "linear PCM LE"; break;
+            case 0x40: R += "Nelly16kHz"; break;
+            case 0x50: R += "Nelly8kHz"; break;
+            case 0x60: R += "Nelly"; break;
+            case 0x70: R += "G711A-law"; break;
+            case 0x80: R += "G711mu-law"; break;
+            case 0x90: R += "reserved"; break;
+            case 0xA0: R += "AAC"; break;
+            case 0xB0: R += "Speex"; break;
+            case 0xE0: R += "MP38kHz"; break;
+            case 0xF0: R += "DeviceSpecific"; break;
+            default: R += "unknown"; break;
+          }
+          switch (data[11] & 0x0C){
+            case 0x0: R += " 5.5kHz"; break;
+            case 0x4: R += " 11kHz"; break;
+            case 0x8: R += " 22kHz"; break;
+            case 0xC: R += " 44kHz"; break;
+          }
+          switch (data[11] & 0x02){
+            case 0: R += " 8bit"; break;
+            case 2: R += " 16bit"; break;
+          }
+          switch (data[11] & 0x01){
+            case 0: R += " mono"; break;
+            case 1: R += " stereo"; break;
+          }
+          R += " audio";
+          if ((data[12] == 0) && ((data[11] & 0xF0) == 0xA0)){
+            R += " initdata";
+          }
+          break;
+        case 0x12:
+          R += "(meta)data";
+          break;
+        default:
+          R += "unknown";
+          break;
+      }
+      return R;
+    };//tagtype
+    unsigned int tagTime(){
+      return (data[4] << 16) + (data[5] << 8) + data[6] + (data[7] << 24);
+    }//tagTime getter
+    void tagTime(unsigned int T){
+      data[4] = ((T >> 16) & 0xFF);
+      data[5] = ((T >> 8) & 0xFF);
+      data[6] = (T & 0xFF);
+      data[7] = ((T >> 24) & 0xFF);
+    }//tagTime setter
+    FLV_Pack(){
+      len = 0; buf = 0; data = 0; isKeyframe = false;
+    }//empty constructor
+    FLV_Pack(const FLV_Pack& O){
+      buf = O.len;
+      len = buf;
+      if (len > 0){
+        data = (char*)malloc(len);
+        memcpy(data, O.data, len);
+      }else{
+        data = 0;
+      }
+      isKeyframe = O.isKeyframe;
+    }//copy constructor
+    FLV_Pack & operator= (const FLV_Pack& O){
+      if (this != &O){//no self-assignment
+        if (data != 0){free(data);}
+        buf = O.len;
+        len = buf;
+        if (len > 0){
+          data = (char*)malloc(len);
+          memcpy(data, O.data, len);
+        }else{
+          data = 0;
+        }
+        isKeyframe = O.isKeyframe;
+      }
+      return *this;
+    }//assignment operator
+};//FLV_Pack
diff --git a/util/flv_sock.cpp b/util/flv_sock.cpp
index be752d73..8b74c9aa 100644
--- a/util/flv_sock.cpp
+++ b/util/flv_sock.cpp
@@ -1,10 +1,4 @@
-
-struct FLV_Pack {
-  int len;
-  int buf;
-  bool isKeyframe;
-  char * data;
-};//FLV_Pack
+#include "flv_pack.cpp"
 
 char FLVHeader[13];
 bool All_Hell_Broke_Loose = false;