sstvfreq.c

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/*
 * © Stuart Longland VK4MSL
 * SPDX-License-Identifier: MIT
 */
 
#include <libsstvenc/sstvfreq.h>
 
uint16_t sstvenc_level_freq(uint8_t level) {
        double flevel = level / ((float)UINT8_MAX);
        if (flevel >= 1.0) {
                return SSTVENC_FREQ_WHITE;
        } else if (flevel <= 0.0) {
                return SSTVENC_FREQ_BLACK;
        } else {
                return (uint16_t)(SSTVENC_FREQ_BLACK
                                  + (flevel
                                     * (double)(SSTVENC_FREQ_WHITE
                                                - SSTVENC_FREQ_BLACK))
                                  + 0.5);
        }
}