rspline
Files: rspline.h, rspline.c
Random spline curve generator
This is a function that generates random spline curves. This signal generator
is ideal for control signals. Curves are quite smooth when cps_min is not
too different from cps_max. When the range of these two is big,
some discontinuity may occur. Due to the interpolation, the output
may be greater than the range values.
sp_rspline_create(sp_rspline **rspline)
sp_rspline_init(sp_data *sp, sp_rspline *rspline)
sp_rspline_compute(sp_data *sp, sp_rspline *rspline, SPFLOAT *dummy, SPFLOAT *out)
sp_rspline_destroy(sp_rspline **rspline)
Optional Parameters
min: Minimum range.
(Default value: 0)
max: Maximum range
(Default value: 1)
cps_min:
(Default value: 0.1)
cps_max:
(Default value: 3)
Outputs
out: Signal output.
Example Code
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "soundpipe.h"
typedef struct {
sp_rspline *rspline;
sp_osc *osc;
sp_ftbl *ft;
} UserData;
void process(sp_data *sp, void *udata) {
UserData *ud = udata;
SPFLOAT osc = 0, rspline = 0;
sp_rspline_compute(sp, ud->rspline, NULL, &rspline);
ud->osc->freq = rspline;
sp_osc_compute(sp, ud->osc, NULL, &osc);
sp->out[0] = osc;
}
int main() {
UserData ud;
sp_data *sp;
sp_create(&sp);
sp_srand(sp, 1234567);
sp_rspline_create(&ud.rspline);
sp_osc_create(&ud.osc);
sp_ftbl_create(sp, &ud.ft, 2048);
sp_rspline_init(sp, ud.rspline);
ud.rspline->min = 300;
ud.rspline->max = 900;
ud.rspline->cps_min = 0.1;
ud.rspline->cps_max = 3;
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_rspline_destroy(&ud.rspline);
sp_ftbl_destroy(&ud.ft);
sp_osc_destroy(&ud.osc);
sp_destroy(&sp);
return 0;
}