1 | /* |
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2 | Copyright (C) 2003 Paul Brossier |
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3 | |
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4 | This program is free software; you can redistribute it and/or modify |
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5 | it under the terms of the GNU General Public License as published by |
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6 | the Free Software Foundation; either version 2 of the License, or |
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7 | (at your option) any later version. |
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8 | |
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9 | This program is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | GNU General Public License for more details. |
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13 | |
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14 | You should have received a copy of the GNU General Public License |
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15 | along with this program; if not, write to the Free Software |
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16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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17 | */ |
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18 | |
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19 | /* This algorithm was developped by A. de Cheveigne and H. Kawahara and |
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20 | * published in: |
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21 | * |
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22 | * de Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency |
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23 | * estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930. |
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24 | * |
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25 | * see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html |
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26 | */ |
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27 | |
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28 | #include "aubio_priv.h" |
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29 | #include "fvec.h" |
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30 | #include "mathutils.h" |
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31 | #include "pitch/pitchyin.h" |
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32 | |
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33 | struct _aubio_pitchyin_t { |
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34 | fvec_t * yin; |
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35 | smpl_t tol; |
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36 | }; |
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37 | |
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38 | /** compute difference function |
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39 | |
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40 | \param input input signal |
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41 | \param yinbuf output buffer to store difference function (half shorter than input) |
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42 | |
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43 | */ |
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44 | void aubio_pitchyin_diff(fvec_t * input, fvec_t * yinbuf); |
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45 | |
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46 | /** in place computation of the YIN cumulative normalised function |
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47 | |
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48 | \param yinbuf input signal (a square difference function), also used to store function |
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49 | |
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50 | */ |
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51 | void aubio_pitchyin_getcum(fvec_t * yinbuf); |
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52 | |
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53 | /** detect pitch in a YIN function |
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54 | |
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55 | \param yinbuf input buffer as computed by aubio_pitchyin_getcum |
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56 | |
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57 | */ |
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58 | uint_t aubio_pitchyin_getpitch(fvec_t *yinbuf); |
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59 | |
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60 | aubio_pitchyin_t * new_aubio_pitchyin (uint_t bufsize) { |
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61 | aubio_pitchyin_t * o = AUBIO_NEW(aubio_pitchyin_t); |
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62 | o->yin = new_fvec (bufsize/2, 1); |
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63 | o->tol = 0.15; |
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64 | return o; |
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65 | } |
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66 | |
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67 | void del_aubio_pitchyin (aubio_pitchyin_t *o) { |
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68 | del_fvec(o->yin); |
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69 | AUBIO_FREE(o); |
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70 | } |
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71 | |
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72 | /* outputs the difference function */ |
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73 | void aubio_pitchyin_diff(fvec_t * input, fvec_t * yin){ |
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74 | uint_t c,j,tau; |
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75 | smpl_t tmp; |
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76 | for (c=0;c<input->channels;c++) |
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77 | { |
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78 | for (tau=0;tau<yin->length;tau++) |
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79 | { |
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80 | yin->data[c][tau] = 0.; |
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81 | } |
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82 | for (tau=1;tau<yin->length;tau++) |
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83 | { |
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84 | for (j=0;j<yin->length;j++) |
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85 | { |
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86 | tmp = input->data[c][j] - input->data[c][j+tau]; |
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87 | yin->data[c][tau] += SQR(tmp); |
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88 | } |
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89 | } |
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90 | } |
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91 | } |
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92 | |
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93 | /* cumulative mean normalized difference function */ |
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94 | void aubio_pitchyin_getcum(fvec_t * yin) { |
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95 | uint_t c,tau; |
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96 | smpl_t tmp; |
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97 | for (c=0;c<yin->channels;c++) |
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98 | { |
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99 | tmp = 0.; |
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100 | yin->data[c][0] = 1.; |
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101 | //AUBIO_DBG("%f\t",yin->data[c][0]); |
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102 | for (tau=1;tau<yin->length;tau++) |
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103 | { |
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104 | tmp += yin->data[c][tau]; |
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105 | yin->data[c][tau] *= tau/tmp; |
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106 | //AUBIO_DBG("%f\t",yin->data[c][tau]); |
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107 | } |
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108 | //AUBIO_DBG("\n"); |
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109 | } |
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110 | } |
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111 | |
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112 | uint_t aubio_pitchyin_getpitch(fvec_t * yin) { |
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113 | uint_t c=0,tau=1; |
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114 | do |
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115 | { |
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116 | if(yin->data[c][tau] < 0.1) { |
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117 | while (yin->data[c][tau+1] < yin->data[c][tau]) { |
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118 | tau++; |
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119 | } |
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120 | return tau; |
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121 | } |
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122 | tau++; |
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123 | } while (tau<yin->length); |
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124 | //AUBIO_DBG("No pitch found"); |
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125 | return 0; |
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126 | } |
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127 | |
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128 | |
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129 | /* all the above in one */ |
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130 | void aubio_pitchyin_do(aubio_pitchyin_t *o, fvec_t * input, fvec_t * out){ |
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131 | smpl_t tol = o->tol; |
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132 | fvec_t * yin = o->yin; |
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133 | uint_t c , j,tau = 0; |
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134 | sint_t period; |
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135 | smpl_t tmp = 0., tmp2 = 0.; |
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136 | for (c = 0; c < input->channels; c++) { |
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137 | yin->data[c][0] = 1.; |
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138 | for (tau=1;tau<yin->length;tau++) |
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139 | { |
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140 | yin->data[c][tau] = 0.; |
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141 | for (j=0;j<yin->length;j++) |
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142 | { |
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143 | tmp = input->data[c][j] - input->data[c][j+tau]; |
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144 | yin->data[c][tau] += SQR(tmp); |
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145 | } |
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146 | tmp2 += yin->data[c][tau]; |
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147 | yin->data[c][tau] *= tau/tmp2; |
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148 | period = tau-3; |
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149 | if(tau > 4 && (yin->data[c][period] < tol) && |
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150 | (yin->data[c][period] < yin->data[c][period+1])) { |
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151 | out->data[c][0] = fvec_quadint(yin,period,1); |
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152 | goto beach; |
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153 | } |
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154 | } |
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155 | out->data[c][0] = fvec_quadint(yin,fvec_min_elem(yin),1); |
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156 | beach: |
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157 | continue; |
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158 | } |
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159 | //return 0; |
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160 | } |
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161 | |
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162 | uint_t aubio_pitchyin_set_tolerance (aubio_pitchyin_t *o, smpl_t tol) { |
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163 | o->tol = tol; |
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164 | return 0; |
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165 | } |
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166 | |
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167 | smpl_t aubio_pitchyin_get_tolerance (aubio_pitchyin_t *o) { |
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168 | return o->tol; |
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169 | } |
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