MATLAB: Process all files in folder using sprintf and audioread

Question

I'm trying to process a sequence .mp3 files with different filenames, and get them to output in a subfolder with incrementing names.

However, the script can only find files with a certain filename structure. How can i use the script on all files in the folder, while using sprintf

to make an input, which is processed by audioread? Lastly, how can i reuse the input filename when adding a digit in the output part? (%d)

Ask if you need more info. I'm quite the beginner here.

numfiles = 600;
mydata = cell(1, numfiles);
FS = 16e3; % sampling rate
for loop = 1:numfiles
  input = sprintf('sounds/sentence%d.mp3', loop); % this argument should take all mp3's in folder
  [x,fs] = audioread(input);
x = resample(x, FS, fs);
y = vocoder(x, FS, 8, 160, 'NOISE', 1);
CISignal = y * (rms(x)/rms(y)); 
CISignal = CISignal/max(abs(CISignal(:)))
output = sprintf('sounds/output/sentence%d.wav', loop); % 
fprintf('Saving %s\n', output);
audiowrite(output,CISignal,FS);
end

Thanks to everyone who can point in the right direction!

Sorry – but looking through dozens of Answers, none worked when using sprintf and audioread.

Answer 1

I figured out the input using dir, and loading filenames from the resulting array:

path = 'pathtofiles'; 
a=dir(fullfile(path,'*.mp3')); 
files = { a.name };
FS = 16e3; % sampling rate
for loop = 1:length(files)
  input = files{loop};
  [x,fs] = audioread(input);
  % looping processing code here
end

Now I need to figure out how to export the files using the same name - but I guess that's for another question, if (when) I get stuck

cheers