1 | /* |
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2 | Copyright (C) 2017 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 "spectral/dct.h" |
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24 | |
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25 | #if defined(HAVE_ACCELERATE) |
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26 | |
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27 | #if HAVE_AUBIO_DOUBLE |
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28 | #warning "no double-precision dct with accelerate" |
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29 | #endif |
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30 | |
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31 | struct _aubio_dct_t { |
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32 | uint_t size; |
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33 | fvec_t *tmp; |
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34 | vDSP_DFT_Setup setup; |
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35 | vDSP_DFT_Setup setupInv; |
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36 | }; |
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37 | |
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38 | aubio_dct_t * new_aubio_dct (uint_t size) { |
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39 | aubio_dct_t * s = AUBIO_NEW(aubio_dct_t); |
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40 | |
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41 | if ((sint_t)size < 16 || !aubio_is_power_of_two(size)) { |
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42 | AUBIO_ERR("dct: can only create with sizes greater than 16 and" |
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43 | "that are powers of two, requested %d\n", size); |
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44 | goto beach; |
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45 | } |
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46 | |
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47 | s->setup = vDSP_DCT_CreateSetup(NULL, (vDSP_Length)size, vDSP_DCT_II); |
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48 | s->setupInv = vDSP_DCT_CreateSetup(NULL, (vDSP_Length)size, vDSP_DCT_III); |
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49 | if (s->setup == NULL || s->setupInv == NULL) { |
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50 | goto beach; |
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51 | } |
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52 | |
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53 | s->size = size; |
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54 | |
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55 | return s; |
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56 | |
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57 | beach: |
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58 | del_aubio_dct(s); |
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59 | return NULL; |
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60 | } |
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61 | |
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62 | void del_aubio_dct(aubio_dct_t *s) { |
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63 | if (s->setup) vDSP_DFT_DestroySetup(s->setup); |
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64 | if (s->setupInv) vDSP_DFT_DestroySetup(s->setupInv); |
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65 | AUBIO_FREE(s); |
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66 | } |
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67 | |
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68 | void aubio_dct_do(aubio_dct_t *s, const fvec_t *input, fvec_t *output) { |
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69 | |
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70 | vDSP_DCT_Execute(s->setup, (const float *)input->data, (float *)output->data); |
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71 | |
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72 | // apply orthonormal scaling |
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73 | output->data[0] *= SQRT(1./s->size); |
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74 | smpl_t scaler = SQRT(2./s->size); |
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75 | |
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76 | aubio_vDSP_vsmul(output->data + 1, 1, &scaler, output->data + 1, 1, |
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77 | output->length - 1); |
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78 | |
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79 | } |
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80 | |
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81 | void aubio_dct_rdo(aubio_dct_t *s, const fvec_t *input, fvec_t *output) { |
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82 | |
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83 | output->data[0] = input->data[0] / SQRT(1./s->size); |
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84 | smpl_t scaler = 1./SQRT(2./s->size); |
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85 | |
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86 | aubio_vDSP_vsmul(input->data + 1, 1, &scaler, output->data + 1, 1, |
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87 | output->length - 1); |
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88 | |
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89 | vDSP_DCT_Execute(s->setupInv, (const float *)output->data, |
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90 | (float *)output->data); |
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91 | |
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92 | scaler = 2./s->size; |
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93 | |
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94 | aubio_vDSP_vsmul(output->data, 1, &scaler, output->data, 1, output->length); |
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95 | |
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96 | } |
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97 | |
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98 | #endif //defined(HAVE_ACCELERATE) |
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