scale
Files: scale.h, scale.c
Bipolar Scale
This module scales from unipolar [0, 1] to another range defined by min and max.
sp_scale_create(sp_scale **scale)
sp_scale_init(sp_data *sp, sp_scale *scale)
sp_scale_compute(sp_data *sp, sp_scale *scale, SPFLOAT *in, SPFLOAT *out)
sp_scale_destroy(sp_scale **scale)
Optional Parameters
min: Minimum value to scale to.
(Default value: 0)
max: Maximum value to scale to.
(Default value: 1)
Inputs
in: Signal to be scaled.
Outputs
out: Scaled signal out
Example Code
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "soundpipe.h"
typedef struct {
sp_scale *scale;
sp_osc *osc;
sp_ftbl *ft;
} UserData;
void process(sp_data *sp, void *udata) {
UserData *ud = udata;
SPFLOAT osc = 0, scale = 0;
/* constant set to 1, when scaled, it becomes 440 */
SPFLOAT val = 1;
sp_scale_compute(sp, ud->scale, &val, &scale);
ud->osc->freq = scale;
sp_osc_compute(sp, ud->osc, NULL, &osc);
sp->out[0] = osc;
}
int main() {
srand(1234567);
UserData ud;
sp_data *sp;
sp_create(&sp);
sp_scale_create(&ud.scale);
sp_osc_create(&ud.osc);
sp_ftbl_create(sp, &ud.ft, 2048);
sp_scale_init(sp, ud.scale);
ud.scale->min = 0;
ud.scale->max = 880;
sp_gen_sine(sp, ud.ft);
sp_osc_init(sp, ud.osc, ud.ft, 0);
ud.osc->amp = 0.1;
sp->len = 44100 * 5;
sp_process(sp, &ud, process);
sp_scale_destroy(&ud.scale);
sp_ftbl_destroy(&ud.ft);
sp_osc_destroy(&ud.osc);
sp_destroy(&sp);
return 0;
}