ref: 0eb4025318fb9836649c29d2b3a4a54207373cdd
dir: /src/onsetdetection.h/
/* Copyright (C) 2003 Paul Brossier 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ /** @file * * Onset detection functions * * These functions are adapted from Juan Pablo Bello matlab code. * * - all of the following onset detection function take as arguments the fft of * a windowed signal ( be created with an aubio_pvoc). * * * (the phasevocoder implementation does implement an fftshift like) * * - they output one smpl_t per frame and per channel (stored in a fvec_t * of * size [channels][1]) * * Some of the functions should be improved by - downsampling the input of the * phasevocoder - oversampling the ouput * * \todo write a generic driver (with a phase vocoder and the appropriate * resampling) */ #ifndef ONSETDETECTION_H #define ONSETDETECTION_H #ifdef __cplusplus extern "C" { #endif /** onsetdetection types */ typedef enum { aubio_onset_energy, /**< energy based */ aubio_onset_specdiff, /**< spectral diff */ aubio_onset_hfc, /**< high frequency content */ aubio_onset_complex, /**< complex domain */ aubio_onset_phase, /**< phase fast */ aubio_onset_kl, /**< Kullback Liebler (Hainsworth et al., Onset detection in musical audio signals) */ aubio_onset_mkl /**< modified Kullback Liebler (Hainsworth et al., Onset detection in musical audio signals) */ } aubio_onsetdetection_type; /** onsetdetection structure */ typedef struct _aubio_onsetdetection_t aubio_onsetdetection_t; /** Energy based onset detection function * * calculates the local energy profile * * - buffer 1024 * - overlap 512 */ void aubio_onsetdetection_energy(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); /** High Frequency Content onset detection function * * - buffer 1024 * - overlap 512 */ void aubio_onsetdetection_hfc(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); /** Complex Domain Method onset detection function * * From C. Duxbury & J. Pablo Bello * * - buffer 512 * - overlap 128 * - dowfact 8 * - interpfact 2 */ void aubio_onsetdetection_complex(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); /** Phase Based Method onset detection function * * - buffer 512 * - overlap 128 * - dowfact 8 * - interpfact 2 */ void aubio_onsetdetection_phase(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); /** Spectral difference method onset detection function * * - buffer 512 * - overlap 128 * - dowfact 8 * - interpfact 2 */ void aubio_onsetdetection_specdiff(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); /** Kullback-Liebler onset detection function */ void aubio_onsetdetection_kl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); /** Modified Kullback-Liebler onset detection function */ void aubio_onsetdetection_mkl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); /** Generic function pointing to the choosen one */ void aubio_onsetdetection(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); /** Allocate memory for an onset detection */ aubio_onsetdetection_t * new_aubio_onsetdetection(aubio_onsetdetection_type type, uint_t size, uint_t channels); /** Free memory for an onset detection */ void aubio_onsetdetection_free(aubio_onsetdetection_t *o); #ifdef __cplusplus } #endif #endif /* ONSETDETECTION_H */