ref: 89c44aa13a29d4ee59286d8847804e3adfba39f8
dir: /src/spectral/dct_ooura.c/
/* 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 "spectral/dct.h" #if !defined(HAVE_ACCELERATE) && !defined(HAVE_FFTW3) && !defined(HAVE_INTEL_IPP) typedef struct _aubio_dct_ooura_t aubio_dct_ooura_t; extern void aubio_ooura_ddct(int, int, smpl_t *, int *, smpl_t *); struct _aubio_dct_ooura_t { uint_t size; fvec_t *input; smpl_t *w; int *ip; smpl_t scalers[5]; }; aubio_dct_ooura_t * new_aubio_dct_ooura (uint_t size) { aubio_dct_ooura_t * s = AUBIO_NEW(aubio_dct_ooura_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; s->scalers[0] = 2. * SQRT(1./(4.*s->size)); s->scalers[1] = 2. * SQRT(1./(2.*s->size)); s->scalers[2] = 1. / s->scalers[0]; s->scalers[3] = 1. / s->scalers[1]; s->scalers[4] = 2. / s->size; return s; beach: AUBIO_FREE(s); return NULL; } void del_aubio_dct_ooura(aubio_dct_ooura_t *s) { del_fvec(s->input); AUBIO_FREE(s->ip); AUBIO_FREE(s->w); AUBIO_FREE(s); } void aubio_dct_ooura_do(aubio_dct_ooura_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] *= s->scalers[0]; for (i = 1; i < s->input->length; i++) { s->input->data[i] *= s->scalers[1]; } fvec_copy(s->input, output); } void aubio_dct_ooura_rdo(aubio_dct_ooura_t *s, const fvec_t *input, fvec_t *output) { uint_t i = 0; fvec_copy(input, s->input); s->input->data[0] *= s->scalers[2]; for (i = 1; i < s->input->length; i++) { s->input->data[i] *= s->scalers[3]; } 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] *= s->scalers[4]; } fvec_copy(s->input, output); } #endif //!defined(HAVE_ACCELERATE) && !defined(HAVE_FFTW3)