Matlab code to apply conversion to every file in a folder

Question

I have the following snippet to convert a .wav input to ascii .txt output. How can I modify this code to convert every .wav file in a given directory and then output each .txt file to match the input filenames, which are each unique?

[data, fs] = audioread('waves/sampleInput.wav');
save 'sampleOutput.txt' data -ASCII

Answer 1

The key to a question like this is the dir command . You could try to use it in a construct like this:

dir_in = 'myfolder'; % set directory

filelist = dir(fullfile(dir_in, '*.wav')); % get file list

for i = 1 : length(filelist); % iterate over files in dir
    filename = filelist(i).name;
    disp(['Processing ' num2str(i) '/' num2str(length(filelist)) ': ' filename])
    [data, fs] = audioread(fullfile(dir_in,filename)); % Do your stuff for every file
    save(['sampleOutput_' filename(1:end-4) '.txt'],'data','-ascii') % add filename to output filename, but without '.wav'
end

The ouput will be in the current working directory I believe.

Note: I think it is good practice to use fullfile to build your paths, since this will automatically choose the correct file separator character (Windows: \ vs. UNIX: / ), which means that this code is portable.