For #3176: GB28181: Error and logging for HEVC. v5.0.95 (#3276)

1. Parse video codec from PSM packet.
2. Return error and logging if HEVC packet.
3. Ignore invalid AVC NALUs, drop AVC AUD and SEI.
4. Disconnect TCP connection if HEVC.

trunk/src/kernel/srs_kernel_ps.hpp

@@ -66,6 +66,10 @@ private:
     SrsPsPacket* current_;
     // Whether detect PS packet header integrity.
     bool detect_ps_integrity_;
+public:
+    // The stream type parsed from latest PSM packet.
+    SrsTsStream video_stream_type_;
+    SrsTsStream audio_stream_type_;
 public:
     SrsPsContext();
     virtual ~SrsPsContext();