n_clock_sync.h

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/*
 * Nilorea Library
 * Copyright (C) 2005-2026 Castagnier Mickael
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef __N_CLOCK_SYNC_HEADER
#define __N_CLOCK_SYNC_HEADER
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "n_common.h"
 
#ifndef N_CLOCK_SYNC_SAMPLE_COUNT
#define N_CLOCK_SYNC_SAMPLE_COUNT 11
#endif
 
#ifndef N_CLOCK_SYNC_INTERVAL
#define N_CLOCK_SYNC_INTERVAL 3.0
#endif
 
typedef struct N_CLOCK_SYNC {
    double offset_samples[N_CLOCK_SYNC_SAMPLE_COUNT];
    double rtt_samples[N_CLOCK_SYNC_SAMPLE_COUNT];
    int sample_index;
    int sample_count;
 
    double estimated_offset;
    double estimated_rtt;
 
    double last_sync_time;
 
} N_CLOCK_SYNC;
 
N_CLOCK_SYNC* n_clock_sync_new(void);
 
void n_clock_sync_delete(N_CLOCK_SYNC** cs);
 
int n_clock_sync_process_response(N_CLOCK_SYNC* cs, double client_send_time, double server_time, double local_now);
 
double n_clock_sync_server_time(const N_CLOCK_SYNC* cs, double local_now);
 
int n_clock_sync_should_send(const N_CLOCK_SYNC* cs, double local_now);
 
void n_clock_sync_mark_sent(N_CLOCK_SYNC* cs, double local_now);
 
#ifdef __cplusplus
}
#endif
#endif /* __N_CLOCK_SYNC_HEADER */