Cache RTP packet size, revert 9ee0ed919a

trunk/src/kernel/srs_kernel_rtc_rtp.hpp

@@ -315,7 +315,10 @@ public:
     SrsAvcNaluType nalu_type;
     // The frame type, for RTMP bridger or SFU source.
     SrsFrameType frame_type;
+// Fast cache for performance.
 private:
+    // The cached payload size for packet.
+    int cached_payload_size;
     // The helper handler for decoder, use RAW payload if NULL.
     ISrsRtpPacketDecodeHandler* decode_handler;
 public: