comparison core/magnatagatune/MTTAudioFeatureRAW.m @ 0:e9a9cd732c1e tip

first hg version after svn

+% --
+% This class loads and hanles the aufdio features included with the MTT
+% Library
+% --- 
+
+
+classdef MTTAudioFeatureRAW < AudioFeatureRAW & handle
+    
+    
+    properties(Constant = true)
+        
+        my_revision = str2double(substr('$Rev: 2284 $',  5, -1));
+    end
+    
+    properties
+        % ---
+        % Set default parameters
+        % ---
+        
+    end
+    % ---
+    % member functions
+    % ---
+    methods
+        
+        % ---
+        % constructor: pointer to feature in database
+        % ---
+        function feature = MTTAudioFeatureRAW(varargin)
+
+            feature = feature@AudioFeatureRAW(varargin{:});
+
+        end
+        
+        % ---
+        % load feature data from xml file
+        % ---
+        function data = extract(feature, clip)
+        % load feature data by parsing xml
+            
+            global globalvars;
+        
+            % fprintf('parsing features for clip %d \n',clip.id());
+            
+            % parse feature
+            data = xml_parse_mtt(clip.featurefile_full());
+            
+            % precombine the segmentst information for better
+            % interoperability with MSD data later
+            
+            data.segments_pitches = [data.segments(:).pitches];
+            data.segments_timbre = [data.segments(:).timbre];
+            
+            data.segments_duration = [data.segments(:).duration];
+            data.segments_start = [data.segments(:).start];
+            
+            data.sections_start = [data.sections(:).start];
+            data.sections_duration = [data.sections(:).duration];
+            
+            data.segments_duration =  [data.segments(:).duration];
+
+            data.segments_loudness_max_time = [data.segments(:).loudness_max_time];
+            data.segments_loudness_max = [data.segments(:).loudness_max];
+            data.segments_loudness = [data.segments(:).loudness];
+
+            % ---
+            % TODO: feature.data.bars
+            % ---
+            [data.bars, data.beats, data.tatums] = MTTAudioFeatureRAW.infer_bar_times(data.bars);
+            
+            % save info data
+            data.info.type = 'MTTAudioFeatureRAW';
+            data.info.owner = clip;
+            data.info.owner_id = clip.id;
+            data.info.creatorrev = feature.my_revision;
+            
+            data.info.params = feature.my_params;
+        end
+    end
+    
+    methods(Static)
+    function [bars, beats, tatums] = infer_bar_times(bar)
+        % [bars, beats, tatums] = infer_bar_times(feature)
+        %
+        %  extract bar and beat starting times from tatums            
+            beats = [];
+            bars = [];
+            tatums = [];
+            
+            % bars
+            for i = 1:numel(bar)
+                % beats
+                for j = 1:numel(bar(i).beat)
+                    %  tatums
+                    for k = 1:numel(bar(i).beat(j).tatum)
+                        tatum = bar(i).beat(j).tatum(k);
+                        
+                        % collect tatums and confidence
+                        tatums(1:2,end+1) = [tatum.time,tatum.confidence];
+                        
+
+                        % ---
+                        % save beat if  this is the first tatum in it
+                        % ---
+                        if k == 1
+                            beats(1:2,end+1) = [tatum.time,...
+                               bar(i).beat(j).confidence];
+                           
+                            % ---
+                            % save bar if this is the first tatum in it
+                            % ---
+                            if j == 1
+                                bars(1:2,end+1) = [tatum.time,...
+                                   bar(i).confidence];
+                            end
+                        end
+                        
+                        
+                    end
+                end
+            end
+            
+        % end function
+        end    
+    end
+    
+end