tempo_tapper_common.cxx

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/*
 * Copyright (C) 2021  Patrick Pedersen
 
 * 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/>.
 * 
 */
 
#include <stdlib.h>
#include <stddef.h>
 
#include <tempo_tapper.h>
 
unsigned long tt_period_us(tempo_tapper *tapper)
{
        if (tapper->taps < 1)
                return 0;
 
        unsigned long us = time_to_us(&tapper->prd_sum);
        return us/tapper->taps;
}
 
void tt_tap(tempo_tapper *tapper)
{
        tt_time_t c_time;
        current_time(&c_time);
 
        if (tapper->taps >= 0) {
                tt_time_t tdiff;
                sub_time(&c_time, &tapper->lst_t, &tdiff);
                add_time(&tapper->prd_sum, &tdiff, &tapper->prd_sum);
        }
 
        tapper->taps++;
        tapper->lst_t = c_time;
}
 
tempo_tapper* tt_new()
{
        tempo_tapper *tapper = (tempo_tapper *) malloc(sizeof(tempo_tapper));
        
        if (tapper == NULL)
                return NULL;
        
        tt_reset(tapper);
        return tapper;
}
 
BPM_t tt_bpm(tempo_tapper *tapper)
{
        unsigned long us = tt_period_us(tapper);
        
        if (us == 0)
                return 0;
 
        
        return (60 * S_TO_US)/(BPM_t)tt_period_us(tapper);
}
 
void tt_reset(tempo_tapper *tapper)
{
        tapper->taps = -1;
        reset_time(&tapper->prd_sum);
}