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refclock: split off median filter

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Move the implementation of the median filter to a separate file to make
it useful for NTP. Replace some constants with parameters and generalize
the code to work with full NTP samples (including root dispersion/delay,
stratum, and leap).

For refclocks it should give the same results as before.
This commit is contained in:
Miroslav Lichvar
2018-08-03 15:15:36 +02:00
parent 6bef8aa0e9
commit c498c21fad
4 changed files with 538 additions and 375 deletions
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49
samplefilt.h Normal file
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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2018
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Header file for sample filter.
*/
#ifndef GOT_SAMPLEFILT_H
#define GOT_SAMPLEFILT_H
#include "ntp.h"
typedef struct SPF_Instance_Record *SPF_Instance;
extern SPF_Instance SPF_CreateInstance(int min_samples, int max_samples,
double max_dispersion, double combine_ratio);
extern void SPF_DestroyInstance(SPF_Instance filter);
extern void SPF_AccumulateSample(SPF_Instance filter, NTP_Sample *sample);
extern int SPF_GetLastSample(SPF_Instance filter, NTP_Sample *sample);
extern int SPF_GetNumberOfSamples(SPF_Instance filter);
extern double SPF_GetAvgSampleDispersion(SPF_Instance filter);
extern void SPF_DropSamples(SPF_Instance filter);
extern int SPF_GetFilteredSample(SPF_Instance filter, NTP_Sample *sample);
extern void SPF_SlewSamples(SPF_Instance filter, struct timespec *when,
double dfreq, double doffset);
extern void SPF_AddDispersion(SPF_Instance filter, double dispersion);
#endif