ref: 6f673611be972f56225c4fa902477c51e3b54025
dir: /src/spectral/specdesc.c/
/*
Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org>
This file is part of aubio.
aubio is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
aubio is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with aubio. If not, see <http://www.gnu.org/licenses/>.
*/
#include "aubio_priv.h"
#include "fvec.h"
#include "cvec.h"
#include "spectral/fft.h"
#include "spectral/specdesc.h"
#include "mathutils.h"
#include "utils/hist.h"
void aubio_specdesc_energy(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset);
void aubio_specdesc_hfc(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset);
void aubio_specdesc_complex(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset);
void aubio_specdesc_phase(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset);
void aubio_specdesc_specdiff(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset);
void aubio_specdesc_kl(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset);
void aubio_specdesc_mkl(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset);
void aubio_specdesc_specflux(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset);
extern void aubio_specdesc_centroid (aubio_specdesc_t * o, cvec_t * spec,
fvec_t * desc);
extern void aubio_specdesc_spread (aubio_specdesc_t * o, cvec_t * spec,
fvec_t * desc);
extern void aubio_specdesc_skewness (aubio_specdesc_t * o, cvec_t * spec,
fvec_t * desc);
extern void aubio_specdesc_kurtosis (aubio_specdesc_t * o, cvec_t * spec,
fvec_t * desc);
extern void aubio_specdesc_slope (aubio_specdesc_t * o, cvec_t * spec,
fvec_t * desc);
extern void aubio_specdesc_decrease (aubio_specdesc_t * o, cvec_t * spec,
fvec_t * desc);
extern void aubio_specdesc_rolloff (aubio_specdesc_t * o, cvec_t * spec,
fvec_t * desc);
/** onsetdetection types */
typedef enum {
aubio_onset_energy, /**< energy based */
aubio_onset_specdiff, /**< spectral diff */
aubio_onset_hfc, /**< high frequency content */
aubio_onset_complex, /**< complex domain */
aubio_onset_phase, /**< phase fast */
aubio_onset_kl, /**< Kullback Liebler */
aubio_onset_mkl, /**< modified Kullback Liebler */
aubio_onset_specflux, /**< spectral flux */
aubio_specmethod_centroid, /**< spectral centroid */
aubio_specmethod_spread, /**< spectral spread */
aubio_specmethod_skewness, /**< spectral skewness */
aubio_specmethod_kurtosis, /**< spectral kurtosis */
aubio_specmethod_slope, /**< spectral kurtosis */
aubio_specmethod_decrease, /**< spectral decrease */
aubio_specmethod_rolloff, /**< spectral rolloff */
aubio_onset_default = aubio_onset_hfc, /**< default mode, set to hfc */
} aubio_specdesc_type;
/** structure to store object state */
struct _aubio_specdesc_t {
aubio_specdesc_type onset_type; /**< onset detection type */
/** Pointer to aubio_specdesc_<type> function */
void (*funcpointer)(aubio_specdesc_t *o,
cvec_t * fftgrain, fvec_t * onset);
smpl_t threshold; /**< minimum norm threshold for phase and specdiff */
fvec_t *oldmag; /**< previous norm vector */
fvec_t *dev1 ; /**< current onset detection measure vector */
fvec_t *theta1; /**< previous phase vector, one frame behind */
fvec_t *theta2; /**< previous phase vector, two frames behind */
aubio_hist_t * histog; /**< histogram */
};
/* Energy based onset detection function */
void aubio_specdesc_energy (aubio_specdesc_t *o UNUSED,
cvec_t * fftgrain, fvec_t * onset) {
uint_t j;
onset->data[0] = 0.;
for (j=0;j<fftgrain->length;j++) {
onset->data[0] += SQR(fftgrain->norm[j]);
}
}
/* High Frequency Content onset detection function */
void aubio_specdesc_hfc(aubio_specdesc_t *o UNUSED,
cvec_t * fftgrain, fvec_t * onset){
uint_t j;
onset->data[0] = 0.;
for (j=0;j<fftgrain->length;j++) {
onset->data[0] += (j+1)*fftgrain->norm[j];
}
}
/* Complex Domain Method onset detection function */
void aubio_specdesc_complex (aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset) {
uint_t j;
uint_t nbins = fftgrain->length;
onset->data[0] = 0.;
for (j=0;j<nbins; j++) {
// compute the predicted phase
o->dev1->data[j] = 2. * o->theta1->data[j] - o->theta2->data[j];
// compute the euclidean distance in the complex domain
// sqrt ( r_1^2 + r_2^2 - 2 * r_1 * r_2 * \cos ( \phi_1 - \phi_2 ) )
onset->data[0] +=
SQRT (ABS (SQR (o->oldmag->data[j]) + SQR (fftgrain->norm[j])
- 2. * o->oldmag->data[j] * fftgrain->norm[j]
* COS (o->dev1->data[j] - fftgrain->phas[j])));
/* swap old phase data (need to remember 2 frames behind)*/
o->theta2->data[j] = o->theta1->data[j];
o->theta1->data[j] = fftgrain->phas[j];
/* swap old magnitude data (1 frame is enough) */
o->oldmag->data[j] = fftgrain->norm[j];
}
}
/* Phase Based Method onset detection function */
void aubio_specdesc_phase(aubio_specdesc_t *o,
cvec_t * fftgrain, fvec_t * onset){
uint_t j;
uint_t nbins = fftgrain->length;
onset->data[0] = 0.0;
o->dev1->data[0]=0.;
for ( j=0;j<nbins; j++ ) {
o->dev1->data[j] =
aubio_unwrap2pi(
fftgrain->phas[j]
-2.0*o->theta1->data[j]
+o->theta2->data[j]);
if ( o->threshold < fftgrain->norm[j] )
o->dev1->data[j] = ABS(o->dev1->data[j]);
else
o->dev1->data[j] = 0.0;
/* keep a track of the past frames */
o->theta2->data[j] = o->theta1->data[j];
o->theta1->data[j] = fftgrain->phas[j];
}
/* apply o->histogram */
aubio_hist_dyn_notnull(o->histog,o->dev1);
/* weight it */
aubio_hist_weight(o->histog);
/* its mean is the result */
onset->data[0] = aubio_hist_mean(o->histog);
//onset->data[0] = fvec_mean(o->dev1);
}
/* Spectral difference method onset detection function */
void aubio_specdesc_specdiff(aubio_specdesc_t *o,
cvec_t * fftgrain, fvec_t * onset){
uint_t j;
uint_t nbins = fftgrain->length;
onset->data[0] = 0.0;
for (j=0;j<nbins; j++) {
o->dev1->data[j] = SQRT(
ABS(SQR( fftgrain->norm[j])
- SQR(o->oldmag->data[j])));
if (o->threshold < fftgrain->norm[j] )
o->dev1->data[j] = ABS(o->dev1->data[j]);
else
o->dev1->data[j] = 0.0;
o->oldmag->data[j] = fftgrain->norm[j];
}
/* apply o->histogram (act somewhat as a low pass on the
* overall function)*/
aubio_hist_dyn_notnull(o->histog,o->dev1);
/* weight it */
aubio_hist_weight(o->histog);
/* its mean is the result */
onset->data[0] = aubio_hist_mean(o->histog);
}
/* Kullback Liebler onset detection function
* note we use ln(1+Xn/(Xn-1+0.0001)) to avoid
* negative (1.+) and infinite values (+1.e-10) */
void aubio_specdesc_kl(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset){
uint_t j;
onset->data[0] = 0.;
for (j=0;j<fftgrain->length;j++) {
onset->data[0] += fftgrain->norm[j]
*LOG(1.+fftgrain->norm[j]/(o->oldmag->data[j]+1.e-10));
o->oldmag->data[j] = fftgrain->norm[j];
}
if (isnan(onset->data[0])) onset->data[0] = 0.;
}
/* Modified Kullback Liebler onset detection function
* note we use ln(1+Xn/(Xn-1+0.0001)) to avoid
* negative (1.+) and infinite values (+1.e-10) */
void aubio_specdesc_mkl(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset){
uint_t j;
onset->data[0] = 0.;
for (j=0;j<fftgrain->length;j++) {
onset->data[0] += LOG(1.+fftgrain->norm[j]/(o->oldmag->data[j]+1.e-10));
o->oldmag->data[j] = fftgrain->norm[j];
}
if (isnan(onset->data[0])) onset->data[0] = 0.;
}
/* Spectral flux */
void aubio_specdesc_specflux(aubio_specdesc_t *o, cvec_t * fftgrain, fvec_t * onset){
uint_t j;
onset->data[0] = 0.;
for (j=0;j<fftgrain->length;j++) {
if (fftgrain->norm[j] > o->oldmag->data[j])
onset->data[0] += fftgrain->norm[j] - o->oldmag->data[j];
o->oldmag->data[j] = fftgrain->norm[j];
}
}
/* Generic function pointing to the choosen one */
void
aubio_specdesc_do (aubio_specdesc_t *o, cvec_t * fftgrain,
fvec_t * onset) {
o->funcpointer(o,fftgrain,onset);
}
/* Allocate memory for an onset detection
* depending on the choosen type, allocate memory as needed
*/
aubio_specdesc_t *
new_aubio_specdesc (char_t * onset_mode, uint_t size){
aubio_specdesc_t * o = AUBIO_NEW(aubio_specdesc_t);
uint_t rsize = size/2+1;
aubio_specdesc_type onset_type;
if (strcmp (onset_mode, "energy") == 0)
onset_type = aubio_onset_energy;
else if (strcmp (onset_mode, "specdiff") == 0)
onset_type = aubio_onset_specdiff;
else if (strcmp (onset_mode, "hfc") == 0)
onset_type = aubio_onset_hfc;
else if (strcmp (onset_mode, "complexdomain") == 0)
onset_type = aubio_onset_complex;
else if (strcmp (onset_mode, "complex") == 0)
onset_type = aubio_onset_complex;
else if (strcmp (onset_mode, "phase") == 0)
onset_type = aubio_onset_phase;
else if (strcmp (onset_mode, "mkl") == 0)
onset_type = aubio_onset_mkl;
else if (strcmp (onset_mode, "kl") == 0)
onset_type = aubio_onset_kl;
else if (strcmp (onset_mode, "specflux") == 0)
onset_type = aubio_onset_specflux;
else if (strcmp (onset_mode, "centroid") == 0)
onset_type = aubio_specmethod_centroid;
else if (strcmp (onset_mode, "spread") == 0)
onset_type = aubio_specmethod_spread;
else if (strcmp (onset_mode, "skewness") == 0)
onset_type = aubio_specmethod_skewness;
else if (strcmp (onset_mode, "kurtosis") == 0)
onset_type = aubio_specmethod_kurtosis;
else if (strcmp (onset_mode, "slope") == 0)
onset_type = aubio_specmethod_slope;
else if (strcmp (onset_mode, "decrease") == 0)
onset_type = aubio_specmethod_decrease;
else if (strcmp (onset_mode, "rolloff") == 0)
onset_type = aubio_specmethod_rolloff;
else if (strcmp (onset_mode, "default") == 0)
onset_type = aubio_onset_default;
else {
AUBIO_ERR("unknown spectral descriptor type %s, using default.\n", onset_mode);
onset_type = aubio_onset_default;
}
switch(onset_type) {
/* for both energy and hfc, only fftgrain->norm is required */
case aubio_onset_energy:
break;
case aubio_onset_hfc:
break;
/* the other approaches will need some more memory spaces */
case aubio_onset_complex:
o->oldmag = new_fvec(rsize);
o->dev1 = new_fvec(rsize);
o->theta1 = new_fvec(rsize);
o->theta2 = new_fvec(rsize);
break;
case aubio_onset_phase:
o->dev1 = new_fvec(rsize);
o->theta1 = new_fvec(rsize);
o->theta2 = new_fvec(rsize);
o->histog = new_aubio_hist(0.0, PI, 10);
o->threshold = 0.1;
break;
case aubio_onset_specdiff:
o->oldmag = new_fvec(rsize);
o->dev1 = new_fvec(rsize);
o->histog = new_aubio_hist(0.0, PI, 10);
o->threshold = 0.1;
break;
case aubio_onset_kl:
case aubio_onset_mkl:
case aubio_onset_specflux:
o->oldmag = new_fvec(rsize);
break;
default:
break;
}
/* this switch could be in its own function to change between
* detections on the fly. this would need getting rid of the switch
* above and always allocate all the structure */
switch(onset_type) {
case aubio_onset_energy:
o->funcpointer = aubio_specdesc_energy;
break;
case aubio_onset_hfc:
o->funcpointer = aubio_specdesc_hfc;
break;
case aubio_onset_complex:
o->funcpointer = aubio_specdesc_complex;
break;
case aubio_onset_phase:
o->funcpointer = aubio_specdesc_phase;
break;
case aubio_onset_specdiff:
o->funcpointer = aubio_specdesc_specdiff;
break;
case aubio_onset_kl:
o->funcpointer = aubio_specdesc_kl;
break;
case aubio_onset_mkl:
o->funcpointer = aubio_specdesc_mkl;
break;
case aubio_onset_specflux:
o->funcpointer = aubio_specdesc_specflux;
break;
// for for the additional descriptors. these don't need additional memory
case aubio_specmethod_centroid:
o->funcpointer = aubio_specdesc_centroid;
break;
case aubio_specmethod_spread:
o->funcpointer = aubio_specdesc_spread;
break;
case aubio_specmethod_skewness:
o->funcpointer = aubio_specdesc_skewness;
break;
case aubio_specmethod_kurtosis:
o->funcpointer = aubio_specdesc_kurtosis;
break;
case aubio_specmethod_slope:
o->funcpointer = aubio_specdesc_slope;
break;
case aubio_specmethod_decrease:
o->funcpointer = aubio_specdesc_decrease;
break;
case aubio_specmethod_rolloff:
o->funcpointer = aubio_specdesc_rolloff;
break;
default:
break;
}
o->onset_type = onset_type;
return o;
}
void del_aubio_specdesc (aubio_specdesc_t *o){
switch(o->onset_type) {
/* for both energy and hfc, only fftgrain->norm is required */
case aubio_onset_energy:
break;
case aubio_onset_hfc:
break;
/* the other approaches will need some more memory spaces */
case aubio_onset_complex:
del_fvec(o->oldmag);
del_fvec(o->dev1);
del_fvec(o->theta1);
del_fvec(o->theta2);
break;
case aubio_onset_phase:
del_fvec(o->dev1);
del_fvec(o->theta1);
del_fvec(o->theta2);
del_aubio_hist(o->histog);
break;
case aubio_onset_specdiff:
del_fvec(o->oldmag);
del_fvec(o->dev1);
del_aubio_hist(o->histog);
break;
case aubio_onset_kl:
case aubio_onset_mkl:
case aubio_onset_specflux:
del_fvec(o->oldmag);
break;
default:
break;
}
AUBIO_FREE(o);
}