b@2: function autoalign(folderName, masterIndex)
b@2: % AUTOALIGN aligns audio in folder with selected file (index 'masterIndex')
b@2: % by inserting zeros at the start of the other files. 
b@2: %
b@2: % by Brecht De Man at Centre for Digital Music on 17 November 2014
b@2: 
b@2:     error('Work in progress, function not finished');
b@2:     
b@2:     tic;                                % start measuring time
b@2:     list = dir([foldername '\*.wav']);  % get names of files
b@2:     
b@2:     % remove hidden files from list
b@2:     % see http://www.mathworks.co.uk/matlabcentral/newsreader/view_thread/258220
b@2:     for k = length(list):-1:1
b@2:         fname = list(k).name;
b@2:         if fname(1) == '.'
b@2:             list(k) = [ ];
b@2:         end
b@2:     end
b@2: 
b@2:     % load master file
b@2:     masterAudioChannels = audioread([foldername '/' list(masterIndex).name]); 
b@2:     masterAudio         = sum(masterAudioChannels, 2); % sum to mono
b@2:     disp(['Aligning audio files with ' list(masterIndex).name '...']);
b@2:     
b@2:     % for each other file:
b@2:     for i = 1:length(list)
b@2:         
b@2:         slaveAudioChannels = audioread([foldername '/' list(i).name]); % read file
b@2:         slaveAudio         = sum(slaveAudioChannels, 2); % sum to mono
b@2:         
b@2:         % check sampling rate is the same
b@2:         % ... 
b@2: 
b@2:         % crosscorrelation function
b@2:         xcorr(masterAudio, slaveAudio); 
b@2:         
b@2:         % add zeros to beginning 
b@2:         
b@2:         % monitoring/debugging
b@2:         
b@2:     end
b@2: 
b@2:     elapsedTime = toc;  % stop measuring time
b@2:     disp(['autoalign took ' elapsedTime ' seconds to align the files in folder ' ...
b@2:         folderName ' with master file ' list(masterIndex).name]);
b@2: 
b@2: end