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 | |
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20 | /** \file |
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21 | |
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22 | Onset detection functions |
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23 | |
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24 | All of the following onset detection function take as arguments the FFT of a |
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25 | windowed signal (as created with aubio_pvoc). They output one smpl_t per |
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26 | buffer and per channel (stored in a vector of size [channels]x[1]). |
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27 | |
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28 | These functions were first adapted from Juan Pablo Bello's code, and now |
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29 | include further improvements and modifications made within aubio. |
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30 | |
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31 | */ |
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32 | |
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33 | |
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34 | #ifndef ONSETDETECTION_H |
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35 | #define ONSETDETECTION_H |
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36 | |
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37 | #ifdef __cplusplus |
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38 | extern "C" { |
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39 | #endif |
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40 | |
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41 | /** onsetdetection types */ |
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42 | typedef enum { |
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43 | aubio_onset_energy, /**< energy based */ |
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44 | aubio_onset_specdiff, /**< spectral diff */ |
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45 | aubio_onset_hfc, /**< high frequency content */ |
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46 | aubio_onset_complex, /**< complex domain */ |
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47 | aubio_onset_phase, /**< phase fast */ |
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48 | aubio_onset_kl, /**< Kullback Liebler */ |
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49 | aubio_onset_mkl /**< modified Kullback Liebler */ |
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50 | } aubio_onsetdetection_type; |
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51 | |
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52 | /** onsetdetection structure */ |
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53 | typedef struct _aubio_onsetdetection_t aubio_onsetdetection_t; |
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54 | /** Energy based onset detection function |
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55 | |
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56 | This function calculates the local energy of the input spectral frame. |
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57 | |
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58 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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59 | \param fftgrain input spectral frame |
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60 | \param onset output onset detection function |
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61 | |
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62 | */ |
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63 | void aubio_onsetdetection_energy(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); |
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64 | /** High Frequency Content onset detection function |
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65 | |
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66 | This method computes the High Frequency Content (HFC) of the input spectral |
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67 | frame. The resulting function is efficient at detecting percussive onsets. |
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68 | |
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69 | Paul Masri. Computer modeling of Sound for Transformation and Synthesis of |
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70 | Musical Signal. PhD dissertation, University of Bristol, UK, 1996. |
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71 | |
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72 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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73 | \param fftgrain input spectral frame |
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74 | \param onset output onset detection function |
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75 | |
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76 | */ |
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77 | void aubio_onsetdetection_hfc(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); |
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78 | /** Complex Domain Method onset detection function |
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79 | |
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80 | Christopher Duxbury, Mike E. Davies, and Mark B. Sandler. Complex domain |
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81 | onset detection for musical signals. In Proceedings of the Digital Audio |
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82 | Effects Conference, DAFx-03, pages 90-93, London, UK, 2003. |
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83 | |
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84 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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85 | \param fftgrain input spectral frame |
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86 | \param onset output onset detection function |
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87 | |
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88 | */ |
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89 | void aubio_onsetdetection_complex(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); |
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90 | /** Phase Based Method onset detection function |
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91 | |
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92 | Juan-Pablo Bello, Mike P. Davies, and Mark B. Sandler. Phase-based note onset |
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93 | detection for music signals. In Proceedings of the IEEE International |
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94 | Conference on Acoustics Speech and Signal Processing, pages 441444, |
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95 | Hong-Kong, 2003. |
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96 | |
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97 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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98 | \param fftgrain input spectral frame |
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99 | \param onset output onset detection function |
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100 | |
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101 | */ |
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102 | void aubio_onsetdetection_phase(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); |
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103 | /** Spectral difference method onset detection function |
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104 | |
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105 | Jonhatan Foote and Shingo Uchihashi. The beat spectrum: a new approach to |
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106 | rhythm analysis. In IEEE International Conference on Multimedia and Expo |
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107 | (ICME 2001), pages 881884, Tokyo, Japan, August 2001. |
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108 | |
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109 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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110 | \param fftgrain input spectral frame |
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111 | \param onset output onset detection function |
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112 | |
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113 | */ |
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114 | void aubio_onsetdetection_specdiff(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); |
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115 | /** Kullback-Liebler onset detection function |
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116 | |
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117 | Stephen Hainsworth and Malcom Macleod. Onset detection in music audio |
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118 | signals. In Proceedings of the International Computer Music Conference |
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119 | (ICMC), Singapore, 2003. |
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120 | |
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121 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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122 | \param fftgrain input spectral frame |
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123 | \param onset output onset detection function |
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124 | |
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125 | */ |
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126 | void aubio_onsetdetection_kl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); |
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127 | /** Modified Kullback-Liebler onset detection function |
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128 | |
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129 | Paul Brossier, ``Automatic annotation of musical audio for interactive |
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130 | systems'', Chapter 2, Temporal segmentation, PhD thesis, Centre for Digital |
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131 | music, Queen Mary University of London, London, UK, 2006. |
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132 | |
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133 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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134 | \param fftgrain input spectral frame |
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135 | \param onset output onset detection function |
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136 | |
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137 | */ |
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138 | void aubio_onsetdetection_mkl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); |
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139 | /** execute onset detection function on a spectral frame |
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140 | |
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141 | Generic function to compute onset detection. |
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142 | |
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143 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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144 | \param fftgrain input signal spectrum as computed by aubio_pvoc_do |
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145 | \param onset output vector (one sample long, to send to the peak picking) |
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146 | |
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147 | */ |
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148 | void aubio_onsetdetection(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset); |
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149 | /** creation of an onset detection object |
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150 | |
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151 | \param type onset detection mode |
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152 | \param size length of the input spectrum frame |
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153 | \param channels number of input channels |
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154 | |
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155 | */ |
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156 | aubio_onsetdetection_t * new_aubio_onsetdetection(aubio_onsetdetection_type type, uint_t size, uint_t channels); |
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157 | /** deletion of an onset detection object |
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158 | |
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159 | \param o onset detection object as returned by new_aubio_onsetdetection() |
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160 | |
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161 | */ |
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162 | void del_aubio_onsetdetection(aubio_onsetdetection_t *o); |
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163 | |
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164 | #ifdef __cplusplus |
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165 | } |
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166 | #endif |
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167 | |
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168 | #endif /* ONSETDETECTION_H */ |
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