1 | /* |
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2 | Copyright (C) 2006 Amaury Hazan |
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3 | Ported to aubio from LibXtract |
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4 | http://libxtract.sourceforge.net/ |
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5 | |
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6 | |
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7 | This program is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 2 of the License, or |
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10 | (at your option) any later version. |
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11 | |
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12 | This program is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with this program; if not, write to the Free Software |
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19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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20 | |
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21 | */ |
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22 | |
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23 | |
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24 | #include "mffc.h" |
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25 | |
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26 | // Computation |
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27 | |
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28 | int aubio_mfcc_do(const float *data, const int N, const void *argv, float *result){ |
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29 | |
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30 | aubio_mel_filter *f; |
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31 | int n, filter; |
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32 | |
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33 | f = (aubio_mel_filter *)argv; |
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34 | |
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35 | for(filter = 0; filter < f->n_filters; filter++){ |
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36 | result[filter] = 0.f; |
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37 | for(n = 0; n < N; n++){ |
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38 | result[filter] += data[n] * f->filters[filter][n]; |
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39 | } |
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40 | result[filter] = log(result[filter] < XTRACT_LOG_LIMIT ? XTRACT_LOG_LIMIT : result[filter]); |
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41 | } |
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42 | |
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43 | for(n = filter + 1; n < N; n++) result[n] = 0; |
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44 | |
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45 | aubio_dct_do(result, f->n_filters, NULL, result); |
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46 | |
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47 | return XTRACT_SUCCESS; |
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48 | } |
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49 | |
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50 | int aubio_dct_do(const float *data, const int N, const void *argv, float *result){ |
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51 | |
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52 | fftwf_plan plan; |
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53 | |
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54 | plan = |
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55 | fftwf_plan_r2r_1d(N, (float *) data, result, FFTW_REDFT00, FFTW_ESTIMATE); |
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56 | |
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57 | fftwf_execute(plan); |
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58 | fftwf_destroy_plan(plan); |
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59 | |
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60 | return XTRACT_SUCCESS; |
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61 | } |
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