ptrack
Files: ptrack.h, ptrack.c
Track pitch of a signal.
Ptrack is a pitch tracker, based on an algorithm originally created by
Miller Puckette.
sp_ptrack_create(sp_ptrack **ptrack)
sp_ptrack_init(sp_data *sp, sp_ptrack *ptrack, int ihopsize, int ipeaks)
sp_ptrack_compute(sp_data *sp, sp_ptrack *ptrack, SPFLOAT *in, SPFLOAT *freq, SPFLOAT *amp)
sp_ptrack_destroy(sp_ptrack **ptrack)
Mandatory Parameters
ihopsize: hop size.
(Recommended value: 512)
ipeaks: Number of peaks.
(Recommended value: 20)
Optional Parameters
Inputs
in: Input signal.
Outputs
freq: Guessed frequency (in Hz).
amp: Guessed amplitude.
Example Code
#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;
}