1 | /* |
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2 | Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org> |
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3 | |
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4 | This file is part of aubio. |
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5 | |
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6 | aubio is free software: you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation, either version 3 of the License, or |
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9 | (at your option) any later version. |
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10 | |
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11 | aubio is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU General Public License |
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17 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
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18 | |
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19 | */ |
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20 | |
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21 | #include "aubio_priv.h" |
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22 | #include "fvec.h" |
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23 | #include "utils/scale.h" |
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24 | |
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25 | struct _aubio_scale_t { |
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26 | smpl_t ilow; |
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27 | smpl_t ihig; |
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28 | smpl_t olow; |
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29 | smpl_t ohig; |
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30 | |
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31 | smpl_t scaler; |
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32 | smpl_t irange; |
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33 | |
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34 | /* not implemented yet : type in/out data |
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35 | bool inint; |
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36 | bool outint; |
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37 | */ |
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38 | }; |
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39 | |
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40 | aubio_scale_t * new_aubio_scale (smpl_t ilow, smpl_t ihig, |
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41 | smpl_t olow, smpl_t ohig) { |
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42 | aubio_scale_t * s = AUBIO_NEW(aubio_scale_t); |
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43 | aubio_scale_set_limits (s, ilow, ihig, olow, ohig); |
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44 | return s; |
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45 | } |
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46 | |
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47 | void del_aubio_scale(aubio_scale_t *s) { |
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48 | AUBIO_FREE(s); |
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49 | } |
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50 | |
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51 | uint_t aubio_scale_set_limits (aubio_scale_t *s, smpl_t ilow, smpl_t ihig, |
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52 | smpl_t olow, smpl_t ohig) { |
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53 | smpl_t inputrange = ihig - ilow; |
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54 | smpl_t outputrange= ohig - olow; |
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55 | s->ilow = ilow; |
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56 | s->ihig = ihig; |
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57 | s->olow = olow; |
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58 | s->ohig = ohig; |
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59 | if (inputrange == 0) { |
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60 | s->scaler = 0.0; |
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61 | } else { |
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62 | s->scaler = outputrange/inputrange; |
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63 | if (inputrange < 0) { |
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64 | inputrange = inputrange * -1.0f; |
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65 | } |
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66 | } |
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67 | return AUBIO_OK; |
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68 | } |
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69 | |
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70 | void aubio_scale_do (aubio_scale_t *s, fvec_t *input) |
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71 | { |
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72 | uint_t j; |
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73 | for (j=0; j < input->length; j++){ |
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74 | input->data[j] -= s->ilow; |
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75 | input->data[j] *= s->scaler; |
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76 | input->data[j] += s->olow; |
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77 | } |
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78 | } |
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79 | |
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