gregoire@24: function [sceneSchedule,sceneObjects,score]=getBackground(inputPath,score,eventInfo,sr,noiseLevel,noiseFiltMaxFreq,noiseFiltOrder)
mathieu@14: 
mathieu@14: % This program was written by Mathias Rossignol & Grégoire Lafay
mathieu@14: % is Copyright (C) 2015 IRCAM <http://www.ircam.fr>
mathieu@14: %
mathieu@14: % This program is free software: you can redistribute it and/or modify it
mathieu@14: % under the terms of the GNU General Public License as published by the Free
mathieu@14: % Software Foundation, either version 3 of the License, or (at your option)
mathieu@14: % any later version.
mathieu@14: %
mathieu@14: % This program is distributed in the hope that it will be useful, but
mathieu@14: % WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
mathieu@14: % or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
mathieu@14: % for more details.
mathieu@14: %
mathieu@14: % You should have received a copy of the GNU General Public License along
mathieu@14: % with this program.  If not, see <http://www.gnu.org/licenses/>.
mathieu@14: 
gregoire@24: if isfield(score,'backgrounds')
gregoire@24:     
gregoire@24:     for i=1:length(score.backgrounds)
gregoire@24:         sceneObjects(i) = getSampleInfo(score.backgrounds{i}{1},score.backgrounds{i}{2},'background',inputPath,score.sceneDuration,eventInfo,sr);
gregoire@24:         sceneSchedule(i).classId=i;
gregoire@24:         sceneSchedule(i).classLabel=score.backgrounds{i}{2};
gregoire@24:         sceneSchedule(i).position=0;
gregoire@24:         sceneSchedule(i).instance=1;
gregoire@24:         sceneSchedule(i).isBackground = 1;
gregoire@24:         sceneSchedule(i).duration = score.sceneDuration;
gregoire@24:         if (i==1)
gregoire@24:             sceneSchedule(i).ebr=1;
gregoire@24:         else
gregoire@24:             sceneSchedule(i).ebr= score.backgrounds{i}{3};
gregoire@24:         end
mathieu@14:     end
gregoire@24:     
gregoire@24: else
gregoire@24:     
gregoire@24:     noise=randn(1,sr*score.sceneDuration);
gregoire@24:     noise=noise./max(abs(noise));
gregoire@24:     
gregoire@24:     if noiseFiltMaxFreq
gregoire@24:         noise=filter(fir1(noiseFiltOrder,noiseFiltMaxFreq/sr/2),1,noise);
gregoire@24:     end
gregoire@24:     
gregoirelafay@27:     noise=noise.*power(noiseLevel/20);
gregoire@24:     
gregoire@24:     sceneObjects(1).isBackground = 1;
gregoire@24:     sceneObjects(1).classLabel = 'noise';
gregoire@24:     sceneObjects(1).startTimes = 0;
gregoire@24:     sceneObjects(1).endTimes = score.sceneDuration;
gregoire@24:     sceneObjects(1).names={'noise'};
gregoire@24:     sceneObjects(1).query= 'noise';
gregoire@24:     sceneObjects(1).trackLength=score.sceneDuration;
gregoire@24:     
gregoire@24:     sceneSchedule(1).classId=1;
gregoire@24:     sceneSchedule(1).classLabel='noise';
gregoire@24:     sceneSchedule(1).position=0;
gregoire@24:     sceneSchedule(1).instance=1;
gregoire@24:     sceneSchedule(1).isBackground = 1;
gregoire@24:     sceneSchedule(1).duration = score.sceneDuration;
gregoire@24:     
gregoire@24:     score.backgrounds{1}{1}='noise';
gregoire@24:     score.backgrounds{1}{2}=noise;
mathieu@14: end
mathieu@14: end