Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
and Amaury Hazan <ahazan@iua.upf.edu>
- This file is part of Aubio.
+ This file is part of aubio.
- Aubio is free software: you can redistribute it and/or modify
+ 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,
+ 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/>.
+ along with aubio. If not, see <http://www.gnu.org/licenses/>.
*/
#include "aubio_priv.h"
+#include "fmat.h"
#include "fvec.h"
#include "cvec.h"
#include "spectral/filterbank.h"
+#include "spectral/filterbank_mel.h"
#include "mathutils.h"
-void aubio_filterbank_set_mel_coeffs(aubio_filterbank_t *fb, uint_t samplerate, smpl_t freq_min, smpl_t freq_max){
+uint_t
+aubio_filterbank_set_triangle_bands (aubio_filterbank_t * fb,
+ const fvec_t * freqs, smpl_t samplerate)
+{
- fvec_t *filters = aubio_filterbank_get_coeffs(fb);
- uint_t n_filters = filters->channels, win_s = filters->length;
-
- //slaney params
- smpl_t lowestFrequency = 133.3333;
- smpl_t linearSpacing = 66.66666666;
- smpl_t logSpacing = 1.0711703;
+ fmat_t *filters = aubio_filterbank_get_coeffs (fb);
+ uint_t n_filters = filters->height, win_s = filters->length;
+ fvec_t *lower_freqs, *upper_freqs, *center_freqs;
+ fvec_t *triangle_heights, *fft_freqs;
- uint_t linearFilters = 13;
- uint_t logFilters = 27;
- uint_t allFilters = linearFilters + logFilters;
-
- //buffers for computing filter frequencies
- fvec_t * freqs=new_fvec(allFilters+2 , 1);
-
- fvec_t * lower_freqs=new_fvec( allFilters, 1);
- fvec_t * upper_freqs=new_fvec( allFilters, 1);
- fvec_t * center_freqs=new_fvec( allFilters, 1);
-
- fvec_t * triangle_heights=new_fvec( allFilters, 1);
- //lookup table of each bin frequency in hz
- fvec_t * fft_freqs=new_fvec(win_s, 1);
-
- uint_t filter_cnt, bin_cnt;
-
- //first step: filling all the linear filter frequencies
- for(filter_cnt=0; filter_cnt<linearFilters; filter_cnt++){
- freqs->data[0][filter_cnt]=lowestFrequency+ filter_cnt*linearSpacing;
- }
- smpl_t lastlinearCF=freqs->data[0][filter_cnt-1];
-
- //second step: filling all the log filter frequencies
- for(filter_cnt=0; filter_cnt<logFilters+2; filter_cnt++){
- freqs->data[0][filter_cnt+linearFilters] =
- lastlinearCF*(pow(logSpacing,filter_cnt+1));
- }
-
- //Option 1. copying interesting values to lower_freqs, center_freqs and upper freqs arrays
- //TODO: would be nicer to have a reference to freqs->data, anyway we do not care in this init step
-
- for(filter_cnt=0; filter_cnt<allFilters; filter_cnt++){
- lower_freqs->data[0][filter_cnt]=freqs->data[0][filter_cnt];
- center_freqs->data[0][filter_cnt]=freqs->data[0][filter_cnt+1];
- upper_freqs->data[0][filter_cnt]=freqs->data[0][filter_cnt+2];
- }
-
- //computing triangle heights so that each triangle has unit area
- for(filter_cnt=0; filter_cnt<allFilters; filter_cnt++){
- triangle_heights->data[0][filter_cnt] = 2./(upper_freqs->data[0][filter_cnt]
- - lower_freqs->data[0][filter_cnt]);
- }
-
- //AUBIO_DBG("filter tables frequencies\n");
- //for(filter_cnt=0; filter_cnt<allFilters; filter_cnt++)
- // AUBIO_DBG("filter n. %d %f %f %f %f\n",
- // filter_cnt, lower_freqs->data[0][filter_cnt],
- // center_freqs->data[0][filter_cnt], upper_freqs->data[0][filter_cnt],
- // triangle_heights->data[0][filter_cnt]);
-
- //filling the fft_freqs lookup table, which assigns the frequency in hz to each bin
- for(bin_cnt=0; bin_cnt<win_s; bin_cnt++){
- fft_freqs->data[0][bin_cnt]= aubio_bintofreq(bin_cnt, samplerate, win_s);
- }
-
- //building each filter table
- for(filter_cnt=0; filter_cnt<allFilters; filter_cnt++){
-
- //TODO:check special case : lower freq =0
- //calculating rise increment in mag/Hz
- smpl_t riseInc= triangle_heights->data[0][filter_cnt]/(center_freqs->data[0][filter_cnt]-lower_freqs->data[0][filter_cnt]);
-
- //zeroing begining of filter
- for(bin_cnt=0; bin_cnt<win_s-1; bin_cnt++){
- filters->data[filter_cnt][bin_cnt]=0.0;
- if( fft_freqs->data[0][bin_cnt] <= lower_freqs->data[0][filter_cnt] &&
- fft_freqs->data[0][bin_cnt+1] > lower_freqs->data[0][filter_cnt]) {
+ uint_t fn; /* filter counter */
+ uint_t bin; /* bin counter */
+
+ smpl_t riseInc, downInc;
+
+ /* freqs define the bands of triangular overlapping windows.
+ throw a warning if filterbank object fb is too short. */
+ if (freqs->length - 2 > n_filters) {
+ AUBIO_WRN ("not enough filters, %d allocated but %d requested\n",
+ n_filters, freqs->length - 2);
+ }
+
+ if (freqs->length - 2 < n_filters) {
+ AUBIO_WRN ("too many filters, %d allocated but %d requested\n",
+ n_filters, freqs->length - 2);
+ }
+
+ for (fn = 0; fn < freqs->length; fn++) {
+ if (freqs->data[fn] < 0) {
+ AUBIO_ERR("filterbank_mel: freqs must contain only positive values.\n");
+ return AUBIO_FAIL;
+ } else if (freqs->data[fn] > samplerate / 2) {
+ AUBIO_WRN("filterbank_mel: freqs should contain only "
+ "values < samplerate / 2.\n");
+ } else if (fn > 0 && freqs->data[fn] < freqs->data[fn-1]) {
+ AUBIO_ERR("filterbank_mel: freqs should be a list of frequencies "
+ "sorted from low to high, but freq[%d] < freq[%d-1]\n", fn, fn);
+ return AUBIO_FAIL;
+ } else if (fn > 0 && freqs->data[fn] == freqs->data[fn-1]) {
+ AUBIO_WRN("filterbank_mel: set_triangle_bands received a list "
+ "with twice the frequency %f\n", freqs->data[fn]);
+ }
+ }
+
+ /* convenience reference to lower/center/upper frequency for each triangle */
+ lower_freqs = new_fvec (n_filters);
+ upper_freqs = new_fvec (n_filters);
+ center_freqs = new_fvec (n_filters);
+
+ /* height of each triangle */
+ triangle_heights = new_fvec (n_filters);
+
+ /* lookup table of each bin frequency in hz */
+ fft_freqs = new_fvec (win_s);
+
+ /* fill up the lower/center/upper */
+ for (fn = 0; fn < n_filters; fn++) {
+ lower_freqs->data[fn] = freqs->data[fn];
+ center_freqs->data[fn] = freqs->data[fn + 1];
+ upper_freqs->data[fn] = freqs->data[fn + 2];
+ }
+
+ /* compute triangle heights so that each triangle has unit area */
+ if (aubio_filterbank_get_norm(fb)) {
+ for (fn = 0; fn < n_filters; fn++) {
+ triangle_heights->data[fn] =
+ 2. / (upper_freqs->data[fn] - lower_freqs->data[fn]);
+ }
+ } else {
+ fvec_ones (triangle_heights);
+ }
+
+ /* fill fft_freqs lookup table, which assigns the frequency in hz to each bin */
+ for (bin = 0; bin < win_s; bin++) {
+ fft_freqs->data[bin] =
+ aubio_bintofreq (bin, samplerate, (win_s - 1) * 2);
+ }
+
+ /* zeroing of all filters */
+ fmat_zeros (filters);
+
+ /* building each filter table */
+ for (fn = 0; fn < n_filters; fn++) {
+
+ /* skip first elements */
+ for (bin = 0; bin < win_s - 1; bin++) {
+ if (fft_freqs->data[bin] <= lower_freqs->data[fn] &&
+ fft_freqs->data[bin + 1] > lower_freqs->data[fn]) {
+ bin++;
break;
}
}
- bin_cnt++;
-
- //positive slope
- for(; bin_cnt<win_s-1; bin_cnt++){
- filters->data[filter_cnt][bin_cnt]=(fft_freqs->data[0][bin_cnt]-lower_freqs->data[0][filter_cnt])*riseInc;
- //if(fft_freqs->data[0][bin_cnt]<= center_freqs->data[0][filter_cnt] && fft_freqs->data[0][bin_cnt+1]> center_freqs->data[0][filter_cnt])
- if(fft_freqs->data[0][bin_cnt+1]> center_freqs->data[0][filter_cnt])
+
+ /* compute positive slope step size */
+ riseInc = triangle_heights->data[fn]
+ / (center_freqs->data[fn] - lower_freqs->data[fn]);
+
+ /* compute coefficients in positive slope */
+ for (; bin < win_s - 1; bin++) {
+ filters->data[fn][bin] =
+ (fft_freqs->data[bin] - lower_freqs->data[fn]) * riseInc;
+
+ if (fft_freqs->data[bin + 1] >= center_freqs->data[fn]) {
+ bin++;
break;
+ }
}
- //bin_cnt++;
-
- //negative slope
- for(; bin_cnt<win_s-1; bin_cnt++){
-
- //checking whether last value is less than 0...
- smpl_t val=triangle_heights->data[0][filter_cnt]-(fft_freqs->data[0][bin_cnt]-center_freqs->data[0][filter_cnt])*riseInc;
- if(val>=0)
- filters->data[filter_cnt][bin_cnt]=val;
- else filters->data[filter_cnt][bin_cnt]=0.0;
-
- //if(fft_freqs->data[0][bin_cnt]<= upper_freqs->data[0][bin_cnt] && fft_freqs->data[0][bin_cnt+1]> upper_freqs->data[0][filter_cnt])
- //TODO: CHECK whether bugfix correct
- if(fft_freqs->data[0][bin_cnt+1]> upper_freqs->data[0][filter_cnt])
+
+ /* compute negative slope step size */
+ downInc = triangle_heights->data[fn]
+ / (upper_freqs->data[fn] - center_freqs->data[fn]);
+
+ /* compute coefficents in negative slope */
+ for (; bin < win_s - 1; bin++) {
+ filters->data[fn][bin] +=
+ (upper_freqs->data[fn] - fft_freqs->data[bin]) * downInc;
+
+ if (filters->data[fn][bin] < 0.) {
+ filters->data[fn][bin] = 0.;
+ }
+
+ if (fft_freqs->data[bin + 1] >= upper_freqs->data[fn])
break;
}
- //bin_cnt++;
-
- //zeroing tail
- for(; bin_cnt<win_s; bin_cnt++)
- filters->data[filter_cnt][bin_cnt]=0.f;
+ /* nothing else to do */
+
+ }
+
+ /* destroy temporarly allocated vectors */
+ del_fvec (lower_freqs);
+ del_fvec (upper_freqs);
+ del_fvec (center_freqs);
+
+ del_fvec (triangle_heights);
+ del_fvec (fft_freqs);
+
+ return AUBIO_OK;
+}
+uint_t
+aubio_filterbank_set_mel_coeffs_slaney (aubio_filterbank_t * fb,
+ smpl_t samplerate)
+{
+ uint_t retval;
+
+ /* Malcolm Slaney parameters */
+ smpl_t lowestFrequency = 133.3333;
+ smpl_t linearSpacing = 66.66666666;
+ smpl_t logSpacing = 1.0711703;
+
+ uint_t linearFilters = 13;
+ uint_t logFilters = 27;
+ uint_t n_filters = linearFilters + logFilters;
+
+ uint_t fn; /* filter counter */
+
+ smpl_t lastlinearCF;
+
+ /* buffers to compute filter frequencies */
+ fvec_t *freqs;
+
+ if (samplerate <= 0) {
+ AUBIO_ERR("filterbank: set_mel_coeffs_slaney samplerate should be > 0\n");
+ return AUBIO_FAIL;
}
-
- /* destroy temporarly allocated vectors */
- del_fvec(freqs);
- del_fvec(lower_freqs);
- del_fvec(upper_freqs);
- del_fvec(center_freqs);
- del_fvec(triangle_heights);
- del_fvec(fft_freqs);
+ freqs = new_fvec (n_filters + 2);
+ /* first step: fill all the linear filter frequencies */
+ for (fn = 0; fn < linearFilters; fn++) {
+ freqs->data[fn] = lowestFrequency + fn * linearSpacing;
+ }
+ lastlinearCF = freqs->data[fn - 1];
+
+ /* second step: fill all the log filter frequencies */
+ for (fn = 0; fn < logFilters + 2; fn++) {
+ freqs->data[fn + linearFilters] =
+ lastlinearCF * (POW (logSpacing, fn + 1));
+ }
+
+ /* now compute the actual coefficients */
+ retval = aubio_filterbank_set_triangle_bands (fb, freqs, samplerate);
+
+ /* destroy vector used to store frequency limits */
+ del_fvec (freqs);
+
+ return retval;
}
+static uint_t aubio_filterbank_check_freqs (aubio_filterbank_t *fb UNUSED,
+ smpl_t samplerate, smpl_t *freq_min, smpl_t *freq_max)
+{
+ if (samplerate <= 0) {
+ AUBIO_ERR("filterbank: set_mel_coeffs samplerate should be > 0\n");
+ return AUBIO_FAIL;
+ }
+ if (*freq_max < 0) {
+ AUBIO_ERR("filterbank: set_mel_coeffs freq_max should be > 0\n");
+ return AUBIO_FAIL;
+ } else if (*freq_max == 0) {
+ *freq_max = samplerate / 2.;
+ }
+ if (*freq_min < 0) {
+ AUBIO_ERR("filterbank: set_mel_coeffs freq_min should be > 0\n");
+ return AUBIO_FAIL;
+ }
+ return AUBIO_OK;
+}
+
+uint_t
+aubio_filterbank_set_mel_coeffs (aubio_filterbank_t * fb, smpl_t samplerate,
+ smpl_t freq_min, smpl_t freq_max)
+{
+ uint_t m, retval;
+ smpl_t start = freq_min, end = freq_max, step;
+ fvec_t *freqs;
+ fmat_t *coeffs = aubio_filterbank_get_coeffs(fb);
+ uint_t n_bands = coeffs->height;
+
+ if (aubio_filterbank_check_freqs(fb, samplerate, &start, &end)) {
+ return AUBIO_FAIL;
+ }
+
+ start = aubio_hztomel(start);
+ end = aubio_hztomel(end);
+
+ freqs = new_fvec(n_bands + 2);
+ step = (end - start) / (n_bands + 1);
+
+ for (m = 0; m < n_bands + 2; m++)
+ {
+ freqs->data[m] = MIN(aubio_meltohz(start + step * m), samplerate/2.);
+ }
+
+ retval = aubio_filterbank_set_triangle_bands (fb, freqs, samplerate);
+
+ /* destroy vector used to store frequency limits */
+ del_fvec (freqs);
+ return retval;
+}
+
+uint_t
+aubio_filterbank_set_mel_coeffs_htk (aubio_filterbank_t * fb, smpl_t samplerate,
+ smpl_t freq_min, smpl_t freq_max)
+{
+ uint_t m, retval;
+ smpl_t start = freq_min, end = freq_max, step;
+ fvec_t *freqs;
+ fmat_t *coeffs = aubio_filterbank_get_coeffs(fb);
+ uint_t n_bands = coeffs->height;
+
+ if (aubio_filterbank_check_freqs(fb, samplerate, &start, &end)) {
+ return AUBIO_FAIL;
+ }
+
+ start = aubio_hztomel_htk(start);
+ end = aubio_hztomel_htk(end);
+
+ freqs = new_fvec (n_bands + 2);
+ step = (end - start) / (n_bands + 1);
+
+ for (m = 0; m < n_bands + 2; m++)
+ {
+ freqs->data[m] = MIN(aubio_meltohz_htk(start + step * m), samplerate/2.);
+ }
+
+ retval = aubio_filterbank_set_triangle_bands (fb, freqs, samplerate);
+
+ /* destroy vector used to store frequency limits */
+ del_fvec (freqs);
+ return retval;
+}
projects / aubio.git / blobdiff