1 files changed, 86 insertions, 0 deletions
diff --git a/src/utl_jitter.h b/src/utl_jitter.h
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+++ b/src/utl_jitter.h
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+#ifndef  UTL_JITTER_H
+#define  UTL_JITTER_H
+/*
+ Hanoh Haim
+ Cisco Systems, Inc.
+*/
+
+/*
+Copyright (c) 2015-2015 Cisco Systems, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+
+#include <stdint.h>
+
+class CJitter {
+
+public:     
+   CJitter(){
+       reset();
+   }
+
+   void reset(){
+       m_old_transit=0.0;
+       m_jitter=0.0;
+   }
+
+   double calc(double transit){
+           double d = transit - m_old_transit;
+           m_old_transit = transit;
+           if ( d < 0){
+              d = -d;
+           }
+           m_jitter +=(1.0/16.0) * ((double)d - m_jitter);
+           return(m_jitter);
+        }    
+   double get_jitter(){
+        return (m_jitter);
+   }     
+
+private:
+  double m_old_transit;
+  double m_jitter;
+};
+
+class CJitterUint {
+
+public:     
+   CJitterUint(){
+       reset();
+   }
+
+   void reset(){
+       m_old_transit=0;
+       m_jitter=0;
+   }
+
+   void calc(uint32_t transit){
+           int32_t d = transit - m_old_transit;
+           m_old_transit = transit;
+           if ( d < 0){
+              d = -d;
+           }
+           m_jitter += d - ((m_jitter + 8)>>4);
+        }    
+   uint32_t get_jitter(){
+        return (m_jitter>>4);
+   }     
+
+private:
+  int32_t m_old_transit; /* time usec maximum up to 30msec */
+  int32_t m_jitter;
+};
+
+#endif