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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