Various metadata-related features and improvements:

- Added support for new "NowMs" field that holds up to where no new packets are guaranteed to show up, in order to lower latency.
- Added support for JSON tracks over all TS-based protocols (input and output)
- Added support for AMF metadata conversion to JSON (RTMP/FLV input)
- Fixed MP4 input subtitle tracks
- Generalized websocket-based outputs to all support the same commands and run the same core logic
- Added new "JSONLine" protocol that allows for generic direct line-by-line ingest of subtitles and/or JSON metadata tracks over a TCP socket or console standard input.

lib/ts_stream.h

@@ -22,6 +22,11 @@ namespace TS{
     OPUS = 0x060001
   };
 
+  enum rawDataType{
+    NONE = 0,
+    JSON
+  };
+
   class ADTSRemainder{
   private:
     char *data;
@@ -75,9 +80,11 @@ namespace TS{
     std::set<size_t> getActiveTracks();
 
     void setLastms(size_t tid, uint64_t timestamp);
+    void setRawDataParser(rawDataType parser);
 
   private:
     uint64_t lastPAT;
+    rawDataType rParser;
     ProgramAssociationTable associationTable;
     std::map<size_t, ADTSRemainder> remainders;