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/* lmp.c
* Copyright (C) 2004 Claudio Girardi
*
* This program 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 2 of the License, or (at
* your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_LIBRFFTW
#include <rfftw.h>
#else
#include "fft_radix2.h"
#endif /* HAVE_LIBRFFTW */
#include "glfer.h"
#include "util.h"
#include "lmp.h"
#include "fft.h"
#ifdef HAVE_DMALLOC_H
#include <dmalloc.h> /* dmalloc.h should be included last */
#endif
extern opt_t opt;
static float **psdbufl = NULL;
static double *my = NULL;
static double *sy = NULL;
#ifdef HAVE_LIBRFFTW
static fftw_real *mu = NULL;
#else
static float *mu = NULL;
#endif /* HAVE_LIBRFFTW */
int nl;
void lmp_init(lmp_params_t * params)
{
int i, j;
int n = params->fft.n;
int kmax = params->kmax;
double **v = params->window;
#ifdef HAVE_LIBRFFTW
params->fft.plan = rfftw_create_plan(n, FFTW_REAL_TO_COMPLEX, FFTW_ESTIMATE);
params->fft.inbuf_audio = calloc(n, sizeof(fftw_real));
params->fft.inbuf_fft = calloc(n, sizeof(fftw_real));
params->fft.outbuf = calloc(n, sizeof(fftw_real));
mu = calloc(n, sizeof(fftw_real));
#else
params->fft.inbuf_audio = calloc(n, sizeof(float));
params->fft.inbuf_fft = calloc(n, sizeof(float));
params->fft.outbuf = params->fft.inbuf_fft;
mu = calloc(n, sizeof(float));
#endif /* HAVE_LIBRFFTW */
params->fft.sub_mean = opt.autoscale; // sub_mean only if autoscale (?)
nl = params->avg;
/* spectra of the subsequences */
psdbufl = matrix(0, nl - 1, 0, n - 1);
/* clear psdbufl */
for (j = 0; j < nl; j++) {
for (i = 0; i < n / 2 + 1; i++) {
psdbufl[j][i] = 0.0;
}
}
/* mean */
my = calloc(n, sizeof(double));
/* variance */
sy = calloc(n, sizeof(double));
}
void lmp_do(float *audio_buf, float *psd_buf, float *phase_buf, lmp_params_t * params)
{
int i, j;
static int j_l = 0;
int n_fft = params->fft.n;
double v_hat;
/* apply overlap, limting, windowing, etc. according to active options */
prepare_audio(audio_buf, ¶ms->fft);
/* compute the FFT for the subsequences */
// for (j = 0; j < nll; j++) {
for (i = 0; i < n_fft; i++) {
params->fft.inbuf_fft[i] = params->fft.inbuf_audio[i];
}
/* compute the fft */
#ifdef HAVE_LIBRFFTW
rfftw_one(params->fft.plan, params->fft.inbuf_fft, params->fft.outbuf);
#else
fft_real_radix2_transform(params->fft.inbuf_fft, n_fft);
#endif /* HAVE_LIBRFFTW */
/* compute the power spectrum of the subsequence */
fft_psd(psdbufl[j_l], NULL, ¶ms->fft);
// }
/*
for (i = 0; i < n_fft / 2 + 1; i++) {
psdbufl[j_l][i] = rand() / (RAND_MAX + 1.0);
if (i == 100) psdbufl[j_l][i] += 0.5;
}
*/
/* compute my */
for (i = 0; i < n_fft / 2 + 1; i++) {
my[i] = 0.0;
for (j = 0; j < nl; j++) {
my[i] += psdbufl[j][i];
}
my[i] /= nl;
}
/* compute sy */
for (i = 0; i < n_fft / 2 + 1; i++) {
sy[i] = 0.0;
for (j = 0; j < nl; j++) {
sy[i] += (psdbufl[j][i] - my[i]) * (psdbufl[j][i] - my[i]);
}
sy[i] /= (nl - 1);
}
for (i = 0; i < n_fft / 2 + 1; i++) {
//v_hat = 0.5 * (my[i] - sqrt(fabs(my[i] * my[i] - sy[i])));
v_hat = my[i] * my[i] - sy[i];
if (v_hat < 0.0) v_hat = 0.0;
v_hat = 0.5 * (my[i] - sqrt(v_hat));
psd_buf[i] = -sqrt(nl / 2.0) + (nl * my[i]) / (2.0 * sqrt(2.0 * nl) * v_hat);
if (psd_buf[i] <= 1.0e-3 ) psd_buf[i] = 1e-3;
}
psd_buf[0] = 1e-3;
for (i = 0; i < n_fft / 2 + 1; i++) {
//fprintf(stderr, "%i %e\t", i, psd_buf[i]);
}
/*
for (i = 0; i < n_fft / 2 + 1; i++) {
psd_buf[i] = 0.0;
for (j = 0; j < nl; j++) {
if (psdbufl[j][i] < 1e-13)psdbufl[j][i] = 1e-13;
psd_buf[i] += 1.0 / psdbufl[j][i];
}
psd_buf[i] /= nl;
psd_buf[i] = 1.0 / psd_buf[i];
}
*/
j_l++;
if (j_l == nl)
j_l = 0;
}
void lmp_close(lmp_params_t * params)
{
int n = params->fft.n;
FREE_MAYBE(params->fft.inbuf_audio);
FREE_MAYBE(params->fft.inbuf_fft);
#ifdef HAVE_LIBRFFTW
rfftw_destroy_plan(params->fft.plan);
FREE_MAYBE(params->fft.outbuf);
#endif /* HAVE_LIBRFFTW */
}
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