[dd15573] | 1 | /* |
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| 2 | Copyright (C) 2003-2013 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 | |
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| 22 | #include "config.h" |
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| 23 | #include "aubio_priv.h" |
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| 24 | #include "fvec.h" |
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| 25 | #include "fmat.h" |
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| 26 | #include "io/source.h" |
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| 27 | #include "synth/wavetable.h" |
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| 28 | |
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| 29 | #define WAVETABLE_LEN 4096 |
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| 30 | |
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| 31 | struct _aubio_wavetable_t { |
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| 32 | uint_t samplerate; |
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| 33 | uint_t blocksize; |
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| 34 | uint_t wavetable_length; |
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| 35 | fvec_t *wavetable; |
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| 36 | uint_t playing; |
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| 37 | smpl_t last_pos; |
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| 38 | |
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| 39 | smpl_t target_freq; |
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| 40 | smpl_t freq; |
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| 41 | smpl_t inc_freq; |
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| 42 | |
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| 43 | smpl_t target_amp; |
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| 44 | smpl_t amp; |
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| 45 | smpl_t inc_amp; |
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| 46 | }; |
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| 47 | |
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| 48 | aubio_wavetable_t *new_aubio_wavetable(uint_t samplerate, uint_t blocksize) |
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| 49 | { |
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| 50 | aubio_wavetable_t *s = AUBIO_NEW(aubio_wavetable_t); |
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| 51 | uint_t i = 0; |
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| 52 | s->samplerate = samplerate; |
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| 53 | s->blocksize = blocksize; |
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| 54 | s->wavetable_length = WAVETABLE_LEN; |
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| 55 | s->wavetable = new_fvec(s->wavetable_length + 3); |
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| 56 | for (i = 0; i < s->wavetable_length; i++) { |
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| 57 | s->wavetable->data[i] = SIN(TWO_PI * i / (smpl_t) s->wavetable_length ); |
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| 58 | } |
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| 59 | s->wavetable->data[s->wavetable_length] = s->wavetable->data[0]; |
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| 60 | s->wavetable->data[s->wavetable_length + 1] = s->wavetable->data[1]; |
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| 61 | s->wavetable->data[s->wavetable_length + 2] = s->wavetable->data[2]; |
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| 62 | s->playing = 0; |
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| 63 | s->last_pos = 0.; |
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| 64 | s->freq = 0.; |
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| 65 | s->target_freq = 0.; |
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| 66 | s->inc_freq = 0.; |
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| 67 | |
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| 68 | s->amp = 0.; |
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| 69 | s->target_amp = 0.; |
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| 70 | s->inc_amp = 0.; |
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| 71 | return s; |
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| 72 | } |
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| 73 | |
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| 74 | static smpl_t interp_2(fvec_t *input, smpl_t pos) { |
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| 75 | uint_t idx = (uint_t)FLOOR(pos); |
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| 76 | smpl_t frac = pos - (smpl_t)idx; |
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| 77 | smpl_t a = input->data[idx]; |
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| 78 | smpl_t b = input->data[idx + 1]; |
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| 79 | return a + frac * ( b - a ); |
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| 80 | } |
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| 81 | |
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| 82 | void aubio_wavetable_do ( aubio_wavetable_t * s, fvec_t * input, fvec_t * output) |
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| 83 | { |
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| 84 | uint_t i; |
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| 85 | if (s->playing) { |
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| 86 | smpl_t pos = s->last_pos; |
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| 87 | for (i = 0; i < output->length; i++) { |
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| 88 | if (s->freq != s->target_freq) |
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| 89 | s->freq += s->inc_freq; |
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| 90 | smpl_t inc = s->freq * (smpl_t)(s->wavetable_length) / (smpl_t) (s->samplerate); |
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| 91 | pos += inc; |
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| 92 | while (pos > s->wavetable_length) { |
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| 93 | pos -= s->wavetable_length; |
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| 94 | } |
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| 95 | if ( ABS(s->amp - s->target_amp) > ABS(s->inc_amp) ) |
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| 96 | s->amp += s->inc_amp; |
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| 97 | else |
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| 98 | s->amp = s->target_amp; |
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| 99 | output->data[i] = s->amp * interp_2(s->wavetable, pos); |
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| 100 | } |
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| 101 | s->last_pos = pos; |
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| 102 | } else { |
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| 103 | fvec_set(output, 0.); |
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| 104 | } |
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| 105 | // add input to output if needed |
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| 106 | if (input && input != output) { |
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| 107 | for (i = 0; i < output->length; i++) { |
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| 108 | output->data[i] += input->data[i]; |
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| 109 | } |
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| 110 | } |
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| 111 | } |
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| 112 | |
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| 113 | void aubio_wavetable_do_multi ( aubio_wavetable_t * s, fmat_t * input, fmat_t * output) |
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| 114 | { |
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| 115 | uint_t i, j; |
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| 116 | if (s->playing) { |
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| 117 | smpl_t pos = s->last_pos; |
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| 118 | for (j = 0; j < output->length; j++) { |
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| 119 | if (s->freq != s->target_freq) |
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| 120 | s->freq += s->inc_freq; |
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| 121 | smpl_t inc = s->freq * (smpl_t)(s->wavetable_length) / (smpl_t) (s->samplerate); |
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| 122 | pos += inc; |
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| 123 | while (pos > s->wavetable_length) { |
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| 124 | pos -= s->wavetable_length; |
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| 125 | } |
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| 126 | for (i = 0; i < output->height; i++) { |
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| 127 | output->data[i][j] = interp_2(s->wavetable, pos); |
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| 128 | } |
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| 129 | } |
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| 130 | s->last_pos = pos; |
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| 131 | } else { |
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| 132 | for (j = 0; j < output->length; j++) { |
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| 133 | if (s->freq != s->target_freq) |
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| 134 | s->freq += s->inc_freq; |
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| 135 | } |
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| 136 | fmat_set(output, 0.); |
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| 137 | } |
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| 138 | // add output to input if needed |
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| 139 | if (input && input != output) { |
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| 140 | for (i = 0; i < output->height; i++) { |
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| 141 | for (j = 0; j < output->length; j++) { |
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| 142 | output->data[i][j] += input->data[i][j]; |
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| 143 | } |
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| 144 | } |
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| 145 | } |
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| 146 | } |
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| 147 | |
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| 148 | uint_t aubio_wavetable_get_playing ( aubio_wavetable_t * s ) |
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| 149 | { |
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| 150 | return s->playing; |
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| 151 | } |
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| 152 | |
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| 153 | uint_t aubio_wavetable_set_playing ( aubio_wavetable_t * s, uint_t playing ) |
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| 154 | { |
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| 155 | s->playing = (playing == 1) ? 1 : 0; |
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| 156 | return 0; |
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| 157 | } |
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| 158 | |
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| 159 | uint_t aubio_wavetable_play ( aubio_wavetable_t * s ) |
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| 160 | { |
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| 161 | aubio_wavetable_set_amp (s, 0.7); |
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| 162 | return aubio_wavetable_set_playing (s, 1); |
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| 163 | } |
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| 164 | |
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| 165 | uint_t aubio_wavetable_stop ( aubio_wavetable_t * s ) |
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| 166 | { |
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| 167 | //aubio_wavetable_set_freq (s, 0.); |
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| 168 | aubio_wavetable_set_amp (s, 0.); |
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| 169 | //s->last_pos = 0; |
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| 170 | return aubio_wavetable_set_playing (s, 1); |
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| 171 | } |
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| 172 | |
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| 173 | uint_t aubio_wavetable_set_freq ( aubio_wavetable_t * s, smpl_t freq ) |
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| 174 | { |
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| 175 | if (freq >= 0 && freq < s->samplerate / 2.) { |
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| 176 | uint_t steps = 10; |
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| 177 | s->inc_freq = (freq - s->freq) / steps; |
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| 178 | s->target_freq = freq; |
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| 179 | return 0; |
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| 180 | } else { |
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| 181 | return 1; |
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| 182 | } |
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| 183 | } |
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| 184 | |
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| 185 | smpl_t aubio_wavetable_get_freq ( aubio_wavetable_t * s) { |
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| 186 | return s->freq; |
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| 187 | } |
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| 188 | |
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| 189 | uint_t aubio_wavetable_set_amp ( aubio_wavetable_t * s, smpl_t amp ) |
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| 190 | { |
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| 191 | AUBIO_MSG("amp: %f, s->amp: %f, target_amp: %f, inc_amp: %f\n", |
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| 192 | amp, s->amp, s->target_amp, s->inc_amp); |
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| 193 | if (amp >= 0. && amp < 1.) { |
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| 194 | uint_t steps = 100; |
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| 195 | s->inc_amp = (amp - s->amp) / steps; |
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| 196 | s->target_amp = amp; |
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| 197 | AUBIO_ERR("amp: %f, s->amp: %f, target_amp: %f, inc_amp: %f\n", |
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| 198 | amp, s->amp, s->target_amp, s->inc_amp); |
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| 199 | return 0; |
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| 200 | } else { |
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| 201 | return 1; |
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| 202 | } |
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| 203 | } |
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| 204 | |
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| 205 | smpl_t aubio_wavetable_get_amp ( aubio_wavetable_t * s) { |
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| 206 | return s->amp; |
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| 207 | } |
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| 208 | |
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| 209 | void del_aubio_wavetable( aubio_wavetable_t * s ) |
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| 210 | { |
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| 211 | del_fvec(s->wavetable); |
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| 212 | AUBIO_FREE(s); |
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| 213 | } |
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