guitfx/sust.h

#pragma once

#include <stdbool.h>
#include <stddef.h>

enum sust_mode {
    MODE_Sustain = 0,
    MODE_Sostenuto = 1
};

struct sust {
    enum sust_mode mode;
    bool playing;

    size_t start_idx;
    size_t idx;
    size_t buf_len;
    float* record_buf;
    float* play_buf;
};

void sust_init(struct sust* sust);
void sust_resize(struct sust* sust, size_t new_len);
void sust_swap(struct sust* sust);

void sust_process(
    struct sust* sust,
    size_t frame_size,
    float const* in,
    float* out);