ref: 89c44aa13a29d4ee59286d8847804e3adfba39f8
dir: /src/spectral/dct.h/
/* 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 dct_output transformed input array */ void aubio_dct_do (aubio_dct_t *s, const fvec_t * input, fvec_t * dct_output); /** compute backward DCT \param s dct object as returned by new_aubio_dct \param input input signal \param idct_output transformed input array */ void aubio_dct_rdo (aubio_dct_t *s, const fvec_t * input, fvec_t * idct_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 */