ptrack

Track pitch of a signal. Ptrack is a pitch tracker, based on an algorithm originally created by Miller Puckette.

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

typedef struct {
    sp_ptrack *ptrack;
    sp_osc *osc;
    sp_ftbl *ft;
    sp_blsaw *sig;
    sp_randh *randh;
    sp_port *port;
} UserData;

void process(sp_data *sp, void *udata) {
    UserData *ud = udata;
    SPFLOAT freq = 0, amp = 0, sig = 0, randh = 0, osc = 0;
    SPFLOAT portfreq = 0;
    sp_randh_compute(sp, ud->randh, NULL, &randh);
    sp_port_compute(sp, ud->port, &randh, &portfreq);
    *ud->sig->freq = portfreq;
    sp_blsaw_compute(sp, ud->sig, NULL, &sig);
    sp_ptrack_compute(sp, ud->ptrack, &sig, &freq, &);
    ud->osc->freq = freq * 2;
    sp_osc_compute(sp, ud->osc, NULL, &osc);
    sp->out[0] = (osc + sig * 0.1) * 0.5;
}

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

    sp_ptrack_create(&ud.ptrack);
    sp_osc_create(&ud.osc);
    sp_ftbl_create(sp, &ud.ft, 4096);
    sp_blsaw_create(&ud.sig);
    sp_randh_create(&ud.randh);
    sp_port_create(&ud.port);

    sp_ptrack_init(sp, ud.ptrack, 512, 20);
    sp_randh_init(sp, ud.randh);
    ud.randh->max = 500;
    ud.randh->min = 200;
    ud.randh->freq = 6;
    sp_port_init(sp, ud.port, 0.005);

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

    sp_blsaw_init(sp, ud.sig);
    *ud.sig->amp = 0.5;

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

    sp_blsaw_destroy(&ud.sig);
    sp_randh_destroy(&ud.randh);
    sp_ptrack_destroy(&ud.ptrack);
    sp_ftbl_destroy(&ud.ft);
    sp_osc_destroy(&ud.osc);
    sp_port_destroy(&ud.port);

    sp_destroy(&sp);
    return 0;
}