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1 classdef MTTMixedFeatureGenreBasicSm < MTTAudioFeature & handle
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2 % ---
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3 %
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4 % The usual worklow for these features constist of three steps
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5 % 1. extract: extracts the basic single-file dependent features
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6 % 2. define_global_transform: calculates the global feature
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7 % transformation parameters
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8 % 3. finalise: applies the common transformations to a specific feature
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9 % ---
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10
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11 properties(Constant = true)
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12
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13 % svn hook
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14 my_revision = str2double(substr('$Rev$', 5, -1));
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15 end
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16
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17 properties
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18 % ---
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19 % Set default parameters
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20 % ---
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21 my_params = MTTAudioFeature.inherited_params(...
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22 'MTTAudioFeatureBasicSm', ...
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23 ... % ---
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24 ... % following are GenreBasic parameters
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25 ... % ---
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26 'pct_genres', 1 ... % 1/100 percentile genre tags used
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27 );
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28 end
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29
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30 % ---
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31 % member functions
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32 % ---
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33 methods
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34
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35 % ---
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36 % constructor: pointer to feature in database
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37 % ---
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38 function feature = MTTMixedFeatureGenreBasicSm(varargin)
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39
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40 feature = feature@MTTAudioFeature(varargin{:});
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41 end
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42
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43 % ---
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44 % extract feature data by combining genre adn basicsm features
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45 % ---
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46 function data = extract(feature, clip)
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47
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48 % ---
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49 % get Basic Summary audio features. this includes possible
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50 % local normalisations
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51 % ---
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52 basicsm = clip.audio_features_basicsm(feature.my_params);
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53
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54 % ---
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55 % get genre tag features
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56 % ---
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57
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58 genrebasic = clip.genre_features_basic(feature.my_params);
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59
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60 % save to features data field
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61 data.audio = basicsm;
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62 data.tags = genrebasic;
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63
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64 % prepare field for final features
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65 data.final.vector = [];
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66 data.final.vector_info = struct();
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67 data.final.dim = 0;
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68
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69 % save info data
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70 data.info.type = 'MTTMixedFeatureGenreBasicSm';
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71 data.info.owner_id = clip.id;
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72 data.info.creatorrev = feature.my_revision;
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73
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74 % save parameters
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75 data.info.params = feature.my_params;
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76 end
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77
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78 function define_global_transform(features)
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79 % calculate and set normalization factors from the group of
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80 % input features. These features will be set for the full database
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81
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82 if numel(features) == 1
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83 error ('Insert feature array for this method');
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84 end
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85
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86 % ---
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87 % We collect all the relevant basicsm
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88 % features and get the transform on this basis.
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89 % ---
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90 for i = 1:numel(features)
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91 basicsm(i) = features(i).data.audio;
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92 end
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93
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94 % call the features own transsform function
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95 basicsm.define_global_transform();
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96
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97 % ---
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98 % We collect all the relevant genretag
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99 % features and get the transform on this basis.
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100 % ---
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101 for i = 1:numel(features)
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102 genrebasic(i) = features(i).data.tags;
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103 end
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104
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105 % call the features own transsform function
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106 genrebasic.define_global_transform();
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107
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108 % ---
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109 % set common feature values for mixed features
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110 % ---
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111 features(1).my_db.set_common([1]); %trivial common
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112 end
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113
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114
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115 function finalise(feature)
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116 % applies a final transformation and collects the
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117 % information of this feature within a single vector
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118 % see info for types in specific dimensions
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119
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120 for i = 1:numel(feature)
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121
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122 % check for neccesary parameters
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123 if isempty(feature(i).my_db.commondb)
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124
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125 error('Define the global transformation first');
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126 end
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127
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128 % ---
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129 % finalise audio feature and get vector
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130 % ---
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131 basicsm = feature(i).data.audio;
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132 basicsm.finalise();
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133
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134 % finalise tag features
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135 genrebasic = feature(i).data.tags;
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136 genrebasic.finalise;
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137
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138 % ---
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139 % final data assembly
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140 % ---
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141
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142 % concatenate vectors
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143 feature(i).data.final.vector = ...
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144 [basicsm.vector() ; genrebasic.vector()];
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145
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146 % add feature dimensions
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147 feature(i).data.final.dim = basicsm.dim + genrebasic.dim;
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148
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149 % concatenate labels
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150 feature(i).data.final.vector_info.labels = ...
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151 {basicsm.data.final.vector_info.labels{:}, ...
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152 genrebasic.data.final.vector_info.labels{:}};
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153 end
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154 end
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155
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156 % ---
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157 % destructor: do we really want to remove this
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158 % from the database? No, but
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159 % TODO: create marker for unused objects in db, and a cleanup
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160 % function
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161 % ---
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162 function delete(feature)
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163
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164 end
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165
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166 function visualise(feature)
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167 % ---
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168 % plots the different data types collected in this feature
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169 % ---
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170 for i = 1:numel(feature)
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171 clip = MTTClip(feature(i).owner_id());
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172 end
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173 end
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174 end
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175 end |