fold

Files: fold.h, fold.c

Adds artificial foldover to an audio signal
Primarily created for use with Decimator.

Functions

sp_fold_create(sp_fold **fold)
sp_fold_init(sp_data *sp, sp_fold *fold)
sp_fold_compute(sp_data *sp, sp_fold *fold, SPFLOAT *input, SPFLOAT *out)
sp_fold_destroy(sp_fold **fold)

Optional Parameters

incr: Increment
(Default value: 1000)

Inputs

input: Signal input.

Outputs

out: Signal output.

Example Code

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "soundpipe.h"

typedef struct {
    sp_fold *fold;
    sp_osc *osc;
    sp_ftbl *ft; 
} UserData;

void process(sp_data *sp, void *udata) {
    UserData *ud = udata;
    SPFLOAT osc = 0, fold = 0;
    sp_osc_compute(sp, ud->osc, NULL, &osc);
    sp_fold_compute(sp, ud->fold, &osc, &fold);
    sp->out[0] = fold;
}

int main() {
    srand(1234567);
    UserData ud;
    sp_data *sp;
    sp_create(&sp);

    sp_fold_create(&ud.fold);
    sp_osc_create(&ud.osc);
    sp_ftbl_create(sp, &ud.ft, 2048);

    sp_fold_init(sp, ud.fold);
    sp_gen_sine(sp, ud.ft);
    sp_osc_init(sp, ud.osc, ud.ft, 0);

    sp->len = 44100 * 5;
    sp_process(sp, &ud, process);

    sp_fold_destroy(&ud.fold);
    sp_ftbl_destroy(&ud.ft);
    sp_osc_destroy(&ud.osc);

    sp_destroy(&sp);
    return 0;
}