# we have some clean up to do
'buf_size': 'Py_default_vector_length',
'win_s': 'Py_default_vector_length',
+ 'size': 'Py_default_vector_length',
# and here too
'hop_size': 'Py_default_vector_length / 2',
'hop_s': 'Py_default_vector_length / 2',
'tempo': '1',
'filterbank': 'self->n_filters',
'tss': 'self->buf_size',
+ 'dct': 'self->size',
}
objinputsize = {
#include "temporal/a_weighting.h"
#include "temporal/c_weighting.h"
#include "spectral/fft.h"
+#include "spectral/dct.h"
#include "spectral/phasevoc.h"
#include "spectral/filterbank.h"
#include "spectral/filterbank_mel.h"
--- /dev/null
+/*
+ Copyright (C) 2017 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/>.
+
+*/
+
+/** \file
+
+ Discrete Cosine Transform
+
+ Functions aubio_dct_do() and aubio_dct_rdo() are equivalent to MATLAB/Octave
+ dct() and idct() functions, as well as scipy.fftpack.dct(x, norm='ortho') and
+ scipy.fftpack.idct(x, norm='ortho')
+
+ \example spectral/test-dct.c
+
+*/
+
+#ifndef AUBIO_DCT_H
+#define AUBIO_DCT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** DCT object
+
+ This object computes forward and backward DCT type 2 with orthonormal
+ scaling.
+
+*/
+typedef struct _aubio_dct_t aubio_dct_t;
+
+/** create new DCT computation object
+
+ \param size length of the DCT
+
+*/
+aubio_dct_t * new_aubio_dct(uint_t size);
+
+/** compute forward DCT
+
+ \param s dct object as returned by new_aubio_dct
+ \param input input signal
+ \param output transformed input array
+
+*/
+void aubio_dct_do (aubio_dct_t *s, const fvec_t * input, fvec_t * output);
+
+/** compute backward DCT
+
+ \param s dct object as returned by new_aubio_dct
+ \param input input signal
+ \param output transformed input array
+
+*/
+void aubio_dct_rdo (aubio_dct_t *s, const fvec_t * input, fvec_t * output);
+
+
+/** delete DCT object
+
+ \param s dct object as returned by new_aubio_dct
+
+*/
+void del_aubio_dct (aubio_dct_t *s);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AUBIO_DCT_H */
--- /dev/null
+/*
+ Copyright (C) 2017 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/dct.h"
+
+extern void aubio_ooura_ddct(int, int, smpl_t *, int *, smpl_t *);
+
+struct _aubio_dct_t {
+ uint_t size;
+ fvec_t *input;
+ smpl_t *w;
+ int *ip;
+};
+
+aubio_dct_t * new_aubio_dct (uint_t size) {
+ aubio_dct_t * s = AUBIO_NEW(aubio_dct_t);
+ if (aubio_is_power_of_two(size) != 1) {
+ AUBIO_ERR("dct: can only create with sizes power of two, requested %d\n",
+ size);
+ goto beach;
+ }
+ s->size = size;
+ s->input = new_fvec(s->size);
+ s->w = AUBIO_ARRAY(smpl_t, s->size * 5 / 4);
+ s->ip = AUBIO_ARRAY(int, 3 + (1 << (int)FLOOR(LOG(s->size/2) / LOG(2))) / 2);
+ s->ip[0] = 0;
+ return s;
+beach:
+ AUBIO_FREE(s);
+ return NULL;
+}
+
+void del_aubio_dct(aubio_dct_t *s) {
+ del_fvec(s->input);
+ AUBIO_FREE(s->ip);
+ AUBIO_FREE(s->w);
+ AUBIO_FREE(s);
+}
+
+void aubio_dct_do(aubio_dct_t *s, const fvec_t *input, fvec_t *output) {
+ uint_t i = 0;
+ fvec_copy(input, s->input);
+ aubio_ooura_ddct(s->size, -1, s->input->data, s->ip, s->w);
+ // apply orthonormal scaling
+ s->input->data[0] *= 2.* SQRT(1./(4.*s->input->length));
+ for (i = 1; i < s->input->length; i++) {
+ s->input->data[i] *= 2. * SQRT(1./(2.*s->input->length));
+ }
+ fvec_copy(s->input, output);
+}
+
+void aubio_dct_rdo(aubio_dct_t *s, const fvec_t *input, fvec_t *output) {
+ uint_t i = 0;
+ fvec_copy(input, s->input);
+ s->input->data[0] /= 2.* SQRT(1./(4.*s->input->length));
+ for (i = 1; i < s->input->length; i++) {
+ s->input->data[i] /= 2. * SQRT(1./(2.*s->input->length));
+ }
+ s->input->data[0] *= .5;
+ aubio_ooura_ddct(s->size, 1, s->input->data, s->ip, s->w);
+ for (i = 0; i < s->input->length; i++) {
+ s->input->data[i] *= 2./s->input->length;
+ }
+ fvec_copy(s->input, output);
+}
--- /dev/null
+#include <aubio.h>
+
+int main (void)
+{
+ int return_code = 0;
+ uint_t win_s = 32; // window size
+ uint_t i, n_iters = 10; // number of iterations
+ // create dct object
+ aubio_dct_t * dct = new_aubio_dct(win_s);
+
+ fvec_t * in = new_fvec (win_s); // input buffer
+ fvec_t * dctout = new_fvec (win_s); // output buffer
+
+ if (!dct || !in || !dctout) {
+ return_code = 1;
+ return return_code;
+ }
+
+ in->data[0] = 1.;
+ for (i = 0; i < n_iters; i++) {
+ // execute stft
+ aubio_dct_do (dct, in, dctout);
+ aubio_dct_rdo (dct, dctout, in);
+ }
+ fvec_print(dctout);
+ fvec_print(in);
+ del_fvec(dctout);
+ del_fvec(in);
+
+ del_aubio_dct(dct);
+ return return_code;
+}