Implemented various TS-related library functions.

lib/nal.h

@@ -1,15 +1,45 @@
 #include <string>
 #include <cstdio>
 
-class NAL_Unit{
-  public:
-    NAL_Unit();
-    NAL_Unit(std::string & InputData);
-    bool ReadData(std::string & InputData);
-    std::string AnnexB(bool LongIntro = false);
-    std::string SizePrepended();
-    int Type();
-  private:
-    std::string MyData;
-};
-//NAL_Unit class
+namespace h264{
+  
+  ///Struct containing pre-calculated metadata of an SPS nal unit. Width and height in pixels, fps in Hz
+  struct SPSMeta{
+    unsigned int width;
+    unsigned int height;
+    double fps;
+  };
+  
+  ///Class for analyzing generic nal units
+  class NAL{
+    public:
+      NAL();
+      NAL(std::string & InputData);
+      bool ReadData(std::string & InputData, bool raw = false);
+      std::string AnnexB(bool LongIntro = false);
+      std::string SizePrepended();
+      int Type();
+      std::string getData();
+    protected:
+      unsigned int chroma_format_idc;///<the value of chroma_format_idc
+      std::string MyData;///<The h264 nal unit data
+  };
+  //NAL class
+  
+  ///Special instance of NAL class for analyzing SPS nal units
+  class SPS: public NAL{
+    public:
+    SPS():NAL(){};
+    SPS(std::string & InputData, bool raw = false);
+    SPSMeta getCharacteristics();
+    void analyzeSPS();
+  };
+ 
+  ///Special instance of NAL class for analyzing PPS nal units
+  class PPS: public NAL{
+    public:
+    PPS():NAL(){};
+    PPS(std::string & InputData):NAL(InputData){};
+    void analyzePPS();
+  };
+}//ns h264