MATLAB Answers

Load and store several .wav files within multiple subfolders

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Josh Burt
Josh Burt on 18 Feb 2021
Commented: Jan on 2 Mar 2021
Hola
I have attempted to use some code on MatlabFandom to load in a number of wav files from seperate subfolders- I am struggling to actually save the .wav files I need.
https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F
The files are hundreds of audiofiles relating to speach recognition, they all sit in different subfolders, each with its own date (there are 2 files per day). There are hundreds of subfolders with .wav files in them. I would like the .wav files to be read and saved in an array called 'AudioArray'. I run your code below, I receive an output listing all the file names. But there is no raw data available for me to analyse. I also want to do some processing once the file has been read - in this case I have just put max(audioArray) to show this. Gracias for all help!
% Specify the folder where the files live.
myFolder = 'C:\Users\myname\Documents\voicedata\Audio';
% Check to make sure that folder actually exists. Warn user if it doesn't.
if ~isfolder(myFolder)
errorMessage = sprintf('Error: The following folder does not exist:\n%s\nPlease specify a new folder.', myFolder);
uiwait(warndlg(errorMessage));
myFolder = uigetdir(); % Ask for a new one.
if myFolder == 0
% User clicked Cancel
return;
end
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, '**/*.wav'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for k = 1 : length(theFiles)
baseFileName = theFiles(k).name;
fullFileName = fullfile(theFiles(k).folder, baseFileName);
fprintf(1, 'Now reading %s\n', fullFileName);
% Now do whatever you want with this file name,
% such as reading it in as an image array with imread()
AudioArray = audioread(fullFileName);
maxaudio=max(AudioArray); %calculates the max value of each audiostored in audioArray
drawnow; % Force display to update immediately.
end
  1 Comment
Rik
Rik on 18 Feb 2021
You are overwriting your audio data every iteration. The drawnow seems unnecessary, as you don't modify graphics objects.

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Answers (1)

Jan
Jan on 18 Feb 2021
AudioArray = cell(1, numel(theFiles));
for k = 1 : numel(theFiles) % NUMEL is more direct than LENGTH
baseFileName = theFiles(k).name;
fullFileName = fullfile(theFiles(k).folder, baseFileName);
AudioArray{k} = audioread(fullFileName);
end
  2 Comments
Jan
Jan on 2 Mar 2021
% [YOUR CODE]
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, '**/*.wav'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
% [MY CODE]
AudioArray = cell(1, numel(theFiles));
for k = 1 : numel(theFiles) % NUMEL is more direct than LENGTH
baseFileName = theFiles(k).name;
fullFileName = fullfile(theFiles(k).folder, baseFileName);
AudioArray{k} = audioread(fullFileName);
end
Now all audio files imported to the cell array "AudioArray". You can access the values in a loop again.

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