comparison nonExposed/getBackground.m @ 24:2abd1116ae14

add automatic background generation

-function [sceneSchedule,sceneObjects]=getBackground(inputPath,score,eventInfo,sr)
+function [sceneSchedule,sceneObjects,score]=getBackground(inputPath,score,eventInfo,sr,noiseLevel,noiseFiltMaxFreq,noiseFiltOrder)
 
 % This program was written by Mathias Rossignol & Grégoire Lafay
 % is Copyright (C) 2015 IRCAM <http://www.ircam.fr>
 %
 % This program is free software: you can redistribute it and/or modify it

 % for more details.
 %
 % You should have received a copy of the GNU General Public License along
 % with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-for i=1:length(score.backgrounds)
-    sceneObjects(i) = getSampleInfo(score.backgrounds{i}{1},score.backgrounds{i}{2},'background',inputPath,score.sceneDuration,eventInfo,sr);
-    sceneSchedule(i).classId=i;
-    sceneSchedule(i).classLabel=score.backgrounds{i}{2};
-    sceneSchedule(i).position=0;
-    sceneSchedule(i).instance=1;
-    sceneSchedule(i).isBackground = 1;
-    sceneSchedule(i).duration = score.sceneDuration;
-    if (i==1)
-        sceneSchedule(i).ebr=1;
-    else
-        sceneSchedule(i).ebr= score.backgrounds{i}{3};
+if isfield(score,'backgrounds')
+    
+    for i=1:length(score.backgrounds)
+        sceneObjects(i) = getSampleInfo(score.backgrounds{i}{1},score.backgrounds{i}{2},'background',inputPath,score.sceneDuration,eventInfo,sr);
+        sceneSchedule(i).classId=i;
+        sceneSchedule(i).classLabel=score.backgrounds{i}{2};
+        sceneSchedule(i).position=0;
+        sceneSchedule(i).instance=1;
+        sceneSchedule(i).isBackground = 1;
+        sceneSchedule(i).duration = score.sceneDuration;
+        if (i==1)
+            sceneSchedule(i).ebr=1;
+        else
+            sceneSchedule(i).ebr= score.backgrounds{i}{3};
+        end
     end
+    
+else
+    
+    noise=randn(1,sr*score.sceneDuration);
+    noise=noise./max(abs(noise));
+    
+    if noiseFiltMaxFreq
+        noise=filter(fir1(noiseFiltOrder,noiseFiltMaxFreq/sr/2),1,noise);
+    end
+    
+    noise=noise.*exp(noiseLevel/20);
+    
+    sceneObjects(1).isBackground = 1;
+    sceneObjects(1).classLabel = 'noise';
+    sceneObjects(1).startTimes = 0;
+    sceneObjects(1).endTimes = score.sceneDuration;
+    sceneObjects(1).names={'noise'};
+    sceneObjects(1).query= 'noise';
+    sceneObjects(1).trackLength=score.sceneDuration;
+    
+    sceneSchedule(1).classId=1;
+    sceneSchedule(1).classLabel='noise';
+    sceneSchedule(1).position=0;
+    sceneSchedule(1).instance=1;
+    sceneSchedule(1).isBackground = 1;
+    sceneSchedule(1).duration = score.sceneDuration;
+    
+    score.backgrounds{1}{1}='noise';
+    score.backgrounds{1}{2}=noise;
 end
 end