ref: e4f142c3109be03c707aec0081c4008f2b5813e8
dir: /src/spectral/spectral_centroid.c/
/* Copyright (C) 2007 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. */ #include "aubio_priv.h" #include "cvec.h" #include "spectral/spectral_centroid.h" smpl_t aubio_spectral_centroid(cvec_t * spectrum, smpl_t samplerate) { uint_t i=0, j; smpl_t sum = 0., sc = 0.; for ( j = 0; j < spectrum->length; j++ ) { sum += spectrum->norm[i][j]; } if (sum == 0.) return 0.; for ( j = 0; j < spectrum->length; j++ ) { sc += (smpl_t)j * spectrum->norm[i][j]; } return sc / sum * samplerate / (smpl_t)(spectrum->length); }