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 | /* This algorithm was developed by A. de Cheveigné and H. Kawahara and |
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22 | * published in: |
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23 | * |
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24 | * de Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency |
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25 | * estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930. |
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26 | * |
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27 | * see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html |
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28 | */ |
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29 | |
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30 | #include "aubio_priv.h" |
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31 | #include "fvec.h" |
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32 | #include "mathutils.h" |
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33 | #include "pitch/pitchyin.h" |
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34 | |
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35 | struct _aubio_pitchyin_t |
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36 | { |
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37 | fvec_t *yin; |
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38 | smpl_t tol; |
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39 | smpl_t confidence; |
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40 | }; |
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41 | |
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42 | /** compute difference function |
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43 | |
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44 | \param input input signal |
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45 | \param yinbuf output buffer to store difference function (half shorter than input) |
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46 | |
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47 | */ |
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48 | void aubio_pitchyin_diff (fvec_t * input, fvec_t * yinbuf); |
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49 | |
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50 | /** in place computation of the YIN cumulative normalised function |
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51 | |
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52 | \param yinbuf input signal (a square difference function), also used to store function |
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53 | |
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54 | */ |
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55 | void aubio_pitchyin_getcum (fvec_t * yinbuf); |
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56 | |
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57 | /** detect pitch in a YIN function |
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58 | |
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59 | \param yinbuf input buffer as computed by aubio_pitchyin_getcum |
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60 | |
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61 | */ |
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62 | uint_t aubio_pitchyin_getpitch (const fvec_t * yinbuf); |
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63 | |
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64 | aubio_pitchyin_t * |
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65 | new_aubio_pitchyin (uint_t bufsize) |
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66 | { |
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67 | aubio_pitchyin_t *o = AUBIO_NEW (aubio_pitchyin_t); |
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68 | o->yin = new_fvec (bufsize / 2); |
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69 | o->tol = 0.15; |
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70 | return o; |
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71 | } |
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72 | |
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73 | void |
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74 | del_aubio_pitchyin (aubio_pitchyin_t * o) |
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75 | { |
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76 | del_fvec (o->yin); |
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77 | AUBIO_FREE (o); |
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78 | } |
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79 | |
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80 | /* outputs the difference function */ |
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81 | void |
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82 | aubio_pitchyin_diff (fvec_t * input, fvec_t * yin) |
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83 | { |
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84 | uint_t j, tau; |
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85 | smpl_t tmp; |
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86 | for (tau = 0; tau < yin->length; tau++) { |
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87 | yin->data[tau] = 0.; |
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88 | } |
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89 | for (tau = 1; tau < yin->length; tau++) { |
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90 | for (j = 0; j < yin->length; j++) { |
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91 | tmp = input->data[j] - input->data[j + tau]; |
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92 | yin->data[tau] += SQR (tmp); |
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93 | } |
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94 | } |
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95 | } |
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96 | |
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97 | /* cumulative mean normalized difference function */ |
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98 | void |
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99 | aubio_pitchyin_getcum (fvec_t * yin) |
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100 | { |
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101 | uint_t tau; |
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102 | smpl_t tmp = 0.; |
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103 | yin->data[0] = 1.; |
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104 | //AUBIO_DBG("%f\t",yin->data[0]); |
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105 | for (tau = 1; tau < yin->length; tau++) { |
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106 | tmp += yin->data[tau]; |
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107 | yin->data[tau] *= tau / tmp; |
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108 | //AUBIO_DBG("%f\t",yin->data[tau]); |
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109 | } |
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110 | //AUBIO_DBG("\n"); |
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111 | } |
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112 | |
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113 | uint_t |
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114 | aubio_pitchyin_getpitch (const fvec_t * yin) |
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115 | { |
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116 | uint_t tau = 1; |
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117 | do { |
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118 | if (yin->data[tau] < 0.1) { |
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119 | while (yin->data[tau + 1] < yin->data[tau]) { |
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120 | tau++; |
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121 | } |
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122 | return tau; |
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123 | } |
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124 | tau++; |
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125 | } while (tau < yin->length); |
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126 | //AUBIO_DBG("No pitch found"); |
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127 | return 0; |
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128 | } |
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129 | |
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130 | |
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131 | /* all the above in one */ |
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132 | void |
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133 | aubio_pitchyin_do (aubio_pitchyin_t * o, const fvec_t * input, fvec_t * out) |
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134 | { |
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135 | smpl_t tol = o->tol; |
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136 | fvec_t *yin = o->yin; |
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137 | uint_t j, tau = 0; |
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138 | sint_t period; |
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139 | smpl_t tmp = 0., tmp2 = 0.; |
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140 | yin->data[0] = 1.; |
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141 | for (tau = 1; tau < yin->length; tau++) { |
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142 | yin->data[tau] = 0.; |
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143 | for (j = 0; j < yin->length; j++) { |
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144 | tmp = input->data[j] - input->data[j + tau]; |
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145 | yin->data[tau] += SQR (tmp); |
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146 | } |
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147 | tmp2 += yin->data[tau]; |
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148 | if (tmp2 != 0) { |
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149 | yin->data[tau] *= tau / tmp2; |
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150 | } else { |
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151 | yin->data[tau] = 1.; |
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152 | } |
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153 | period = tau - 3; |
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154 | if (tau > 4 && (yin->data[period] < tol) && |
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155 | (yin->data[period] < yin->data[period + 1])) { |
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156 | out->data[0] = fvec_quadratic_peak_pos (yin, period); |
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157 | goto beach; |
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158 | } |
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159 | } |
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160 | out->data[0] = fvec_quadratic_peak_pos (yin, fvec_min_elem (yin)); |
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161 | beach: |
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162 | return; |
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163 | } |
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164 | |
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165 | smpl_t |
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166 | aubio_pitchyin_get_confidence (aubio_pitchyin_t * o) { |
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167 | o->confidence = 1. - fvec_min (o->yin); |
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168 | return o->confidence; |
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169 | } |
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170 | |
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171 | uint_t |
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172 | aubio_pitchyin_set_tolerance (aubio_pitchyin_t * o, smpl_t tol) |
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173 | { |
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174 | o->tol = tol; |
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175 | return 0; |
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176 | } |
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177 | |
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178 | smpl_t |
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179 | aubio_pitchyin_get_tolerance (aubio_pitchyin_t * o) |
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180 | { |
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181 | return o->tol; |
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182 | } |
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