/*  Copyright (C) 2007-2009 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 "cvec.h"#include "spectral/specdesc.h" void aubio_specdesc_centroid (aubio_specdesc_t * o, const cvec_t * spec,    fvec_t * desc);void aubio_specdesc_spread (aubio_specdesc_t * o, const cvec_t * spec,    fvec_t * desc);void aubio_specdesc_skewness (aubio_specdesc_t * o, const cvec_t * spec,    fvec_t * desc);void aubio_specdesc_kurtosis (aubio_specdesc_t * o, const cvec_t * spec,    fvec_t * desc);void aubio_specdesc_slope (aubio_specdesc_t * o, const cvec_t * spec,    fvec_t * desc);void aubio_specdesc_decrease (aubio_specdesc_t * o, const cvec_t * spec,    fvec_t * desc);void aubio_specdesc_rolloff (aubio_specdesc_t * o, const cvec_t * spec,    fvec_t * desc);  smpl_t cvec_sum (const cvec_t * s);smpl_t cvec_mean (const cvec_t * s);smpl_t cvec_centroid (const cvec_t * s);smpl_t cvec_moment (const cvec_t * s, uint_t moment); smpl_tcvec_sum (const cvec_t * s){  uint_t j;  smpl_t tmp = 0.0;  for (j = 0; j < s->length; j++) {    tmp += s->norm[j];  }  return tmp;} smpl_tcvec_mean (const cvec_t * s){  return cvec_sum (s) / (smpl_t) (s->length);} smpl_tcvec_centroid (const cvec_t * spec){  smpl_t sum, sc = 0.;  uint_t j;  sum = cvec_sum (spec);   if (sum == 0.) {    return 0.;  } else {    for (j = 0; j < spec->length; j++) {      sc += (smpl_t) j *spec->norm[j];    }    return sc / sum;  }} smpl_tcvec_moment (const cvec_t * spec, uint_t order){  smpl_t sum, centroid, sc = 0.;  uint_t j;  sum = cvec_sum (spec);   if (sum == 0.) {    return 0.;  } else {    centroid = cvec_centroid (spec);    for (j = 0; j < spec->length; j++) {      sc += (smpl_t) POW(j - centroid, order) * spec->norm[j];    }    return sc / sum;  }} voidaubio_specdesc_centroid (aubio_specdesc_t * o UNUSED, const cvec_t * spec,    fvec_t * desc){  USED(o);  desc->data[0] = cvec_centroid (spec); } voidaubio_specdesc_spread (aubio_specdesc_t * o UNUSED, const cvec_t * spec,    fvec_t * desc){  USED(o);  desc->data[0] = cvec_moment (spec, 2);} voidaubio_specdesc_skewness (aubio_specdesc_t * o UNUSED, const cvec_t * spec,    fvec_t * desc){  smpl_t spread;  USED(o);  spread = cvec_moment (spec, 2);  if (spread == 0) {    desc->data[0] = 0.;  } else {    desc->data[0] = cvec_moment (spec, 3);    desc->data[0] /= POW ( SQRT (spread), 3);  }} voidaubio_specdesc_kurtosis (aubio_specdesc_t * o UNUSED, const cvec_t * spec,    fvec_t * desc){  smpl_t spread;  USED(o);  spread = cvec_moment (spec, 2);  if (spread == 0) {    desc->data[0] = 0.;  } else {    desc->data[0] = cvec_moment (spec, 4);    desc->data[0] /= SQR (spread);  }} voidaubio_specdesc_slope (aubio_specdesc_t * o UNUSED, const cvec_t * spec,    fvec_t * desc){  uint_t j;  smpl_t norm = 0, sum;   USED(o);  // compute N * sum(j**2) - sum(j)**2  for (j = 0; j < spec->length; j++) {    norm += j*j;  }  norm *= spec->length;  // sum_0^N(j) = length * (length + 1) / 2  norm -= SQR( (spec->length) * (spec->length - 1.) / 2. );  sum = cvec_sum (spec);   desc->data[0] = 0.;  if (sum == 0.) {    return;   } else {    for (j = 0; j < spec->length; j++) {      desc->data[0] += j * spec->norm[j];     }    desc->data[0] *= spec->length;    desc->data[0] -= sum * spec->length * (spec->length - 1) / 2.;    desc->data[0] /= norm;    desc->data[0] /= sum;  }} voidaubio_specdesc_decrease (aubio_specdesc_t *o UNUSED, const cvec_t * spec,    fvec_t * desc){  uint_t j; smpl_t sum;  USED(o);  sum = cvec_sum (spec);   desc->data[0] = 0;  if (sum == 0.) {    return;  } else {    sum -= spec->norm[0];    for (j = 1; j < spec->length; j++) {      desc->data[0] += (spec->norm[j] - spec->norm[0]) / j;    }    desc->data[0] /= sum;  }} voidaubio_specdesc_rolloff (aubio_specdesc_t *o UNUSED, const cvec_t * spec,    fvec_t *desc){  uint_t j; smpl_t cumsum, rollsum;  USED(o);  cumsum = 0.; rollsum = 0.;  for (j = 0; j < spec->length; j++) {    cumsum += SQR (spec->norm[j]);  }  if (cumsum == 0) {    desc->data[0] = 0.;  } else {    cumsum *= 0.95;    j = 0;    while (rollsum < cumsum) {       rollsum += SQR (spec->norm[j]);      j++;    }    desc->data[0] = j;  }}