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This article will show you how to build a voice recorder GUI application using Tkinter in Python. You will learn how to use powerful excellent libraries to process audio data and how to record and save audio files. By the end of this article, you will have a fully functioning voice recorder application that you can use to record your voice or any other sounds.
Please note that this tutorial is about making a GUI for a voice recorder; if you wish for a quick way to record voice, then this tutorial is for you.
Here is the application that we will build at the end of this article:
We are going to develop every bit of it from the ground up. So without further ado, let's dive in!
Here is the table of contents:
First things first, we will start with setting up the project's environment; we will create a virtual environment, so in your terminal, run the command:
$ python -m venv project
Having managed to make the virtual environment, we should activate it and run the command:
Now in this virtual environment, we will install all the required packages for the project. To install these packages, run this command:
$ pip install scipy sounddevice
Our next task is to import all the required modules that will be used for this project, create a new Python file, and save it as
voice_recorder.py, as good practice, make sure to give your Python files meaningful names.
Open the file and paste the following code:
# importing everything from tkinter from tkinter import * # importing the styling module ttk from tkinter from tkinter import ttk # importing the message boxes from tkinter from tkinter.messagebox import showinfo, showerror, askokcancel # this is for recording the actual voice import sounddevice # this is for saving the recorded file to wav file format from scipy.io.wavfile import write # threading will help the app's tasks run concurrently import threading # importing datetime from datetime to handle dates from datetime import datetime # this will handle time import time # os module will be used for renaming files import os
We are first importing everything from
tkinter using the asterisk (*), we are then importing the
ttk module, which is for styling the widgets (labels, entries, buttons, etc.).
We are also importing the message boxes (
tkinter since the application must alert the user of some error or action. Then comes the
sounddevice module. According to the documentation, it is for playing and recording Numpy arrays containing audio signals. After recording, we will have to write the recorded file in a WAV file format, so to do that, we will import
We are also importing the
threading module; this will help the application run smoothly by running the tasks like running the GUI and recording concurrently. The
time modules are for using dates and times, respectively.
Finally, we are importing the
os module; this will help in renaming the recorded files.
In this section, we will now start the GUI designing process; we will do it at a perfect pace so that we are all on the same page and that you can understand all the concepts involved.
Now we will start by creating the main window and adding an icon. This icon will replace the default
Tkinter icon, so below the imports, paste these lines of code:
# creates the window using Tk() fucntion window = Tk() # creates title for the window window.title('Voice Recorder') # the icon for the application, this replaces the default icon window.iconbitmap(window, 'voice_recorder_icon.ico') # dimensions and position of the window window.geometry('500x450+440+180') # makes the window non-resizable window.resizable(height=FALSE, width=FALSE) # this will run the main window infinitely window.mainloop()
We are creating the main window for the application using Tkinter's built-in class
Tk(). To give the title to the window, we are using the
And to add an icon to the window, we are using the
iconbitmap() function, note this takes the window and the actual icon file of format
.ico as arguments, and ensure that the icon file is in the same folder as the program file. For the
width of the window and its position, we are using the
geometry() function, with the values 500x450+440+180, 500 and 450 being
width, and 440 and 180 for positioning the window vertically and horizontally.
To make the main window non-resizable or, in other words, to disable the window's
minimize button, we are using the
resizable() function with
width all set to
Finally, to have the main window running infinitely until the user closes it, we are using the
To test this application, run this command in your terminal:
$ python voice_recorder.py
This is the output that we will get:
And on the top left corner of the main window, we have the new icon:
Before creating the widgets, we should define their styles first. So just below this line of code:
Paste this code:
"""Styles for the widgets""" # style for the label label_style = ttk.Style() label_style.configure('TLabel', foreground='#000000', font=('OCR A Extended', 15)) # style for the entry entry_style = ttk.Style() entry_style.configure('TEntry', font=('Dotum', 15)) # style for the button button_style = ttk.Style() button_style.configure('TButton', foreground='#000000', font='DotumChe')
Here we are creating three style objects using the
ttk.Style() class, the style objects are for the widgets we will create in a moment. To configure these styles, we are using the
configure() function, which takes the style name; in our case, we have named our styles
foreground are the other arguments it takes.
Having taken care of the styles, we need now to create the canvas; this will contain all the widgets for the application. Inside this canvas, we will then add the logo. Below the definition of the styles, add this code:
# creates the canvas for containing all the widgets canvas = Canvas(window, width=500, height=400) canvas.pack() # loading the logo logo = PhotoImage(file='recorder.png') # creates dimensions of the logo logo = logo.subsample(2, 2) # adding the logo to the canvas canvas.create_image(240, 135, image=logo)
This is what is happening in the code snippet above; we are creating the canvas using the
Canvas() function, we are adding this canvas inside the window and giving it a
width of 500 and
height of 400.
We are then loading the logo and giving it dimensions using the
subsample() function, and finally, we add it to the canvas via the
create_image() function. For positioning the logo horizontally, we use 240, and vertically we use 135. Make sure the image file used for the logo is located in the same folder as the program file.
With the above code added, this is how the application looks like:
The canvas might not be visible, but this is how it fits inside the main window with the dimensions we have given it:
Now let's create the first two widgets, the label and the entry; we will place these inside the canvas. Below the logos code, paste this code:
# creating a ttk label duration_label = ttk.Label(window, text='Enter Recording Duration in Seconds:', style='TLabel') # creating a ttk entry duration_entry = ttk.Entry(window, width=76, style='TEntry') # adding the label to the canvas canvas.create_window(235, 290, window=duration_label) # adding the entry to the canvas canvas.create_window(250, 315, window=duration_entry)
Here we are creating the label and the entry using the
ttk.Entry() functions. The
style as arguments, while the
style as arguments. After creating these two, we add them to the canvas using the
Running the application, you will get the following output:
In this section, we will wrap up the GUI designing process by creating the last two widgets, an empty label that we will use for displaying the recording duration and the button for recording. Right after the entry's code, paste the following code:
# creating the empty label for displaying download progress progress_label = ttk.Label(window, text='') # creating the button record_button = ttk.Button(window, text='Record', style='TButton') # adding the label to the canvas canvas.create_window(240, 365, window=progress_label) # adding the button to the canvas canvas.create_window(240, 410, window=record_button)
This code creates the label and the button via two functions
ttk.Button() respectively, with
text as arguments for the
style as arguments for the button. As usual, after creating these widgets, we are adding them to the canvas via the
After adding the above code, let's see how the application will look. Run it, and you will get this output:
We are almost done designing the GUI, but the remaining thing is to make the application interactive when we close it. We want the application to close with the user's confirmation, so below the imports, paste this code:
# the function for closing the main window def close_window(): # here we are checking if the value of askokcancel is True if askokcancel(title='Close Voice Recorder', message='Are you sure you want to close the Voice Recorder?'): # this kills the window window.destroy()
We are creating a simple function called
close_window() and inside it, we have an
if statement for checking if the boolean value of the
False. If it's
True, we will close it using the
Creating the function is not enough to do all the magic for us; we need to let the window's
close button knows which function to trigger when clicked, so below:
window = Tk()
Paste this code:
# this will listen to the close window event window.protocol('WM_DELETE_WINDOW', close_window)
In the code, we have a
protocol() function taking two arguments,
WM_DELETE_WINDOW and the
close_window() function. The whole logic behind this code is that the main window will listen to the close window event initiated by the
close button, and once this event is detected, the
close_window() function is triggered.
Run the application and click the
close button, this is what you will get:
If you click ok, the window will close, and if you click cancel, the window will still be running in the mainloop.
Now that the graphical user interface is taken care of, we need to implement the record voice functionality. We will start by creating the
record_voice() function, so below the
close_window() function, paste this code:
# function for recording sound def record_voice(): # the try statement is for try: # this is the frequence at which the record will happen freq = 44100 # getting the recording duration from the entry duration = int(duration_entry.get()) # calling the recorder via the rec() function recording = sounddevice.rec(duration*freq, samplerate=freq, channels=2) # declaring the counter counter = 0 # the loop is for displaying the recording progress while counter < duration: # updating the window window.update() # this will help update the window after every 1 second time.sleep(1) # incrementing the counter by 1 counter += 1 # displaying the recording duration progress_label.config(text=str(counter)) # this records audio for the specified duration sounddevice.wait() # writing the audio data to recording.wav write('recording.wav', freq, recording) # looping through all the files in the current folder for file in os.listdir(): # checking if the file name is recording.wav if file == 'recording.wav': # spliting the base and the extension base, ext = os.path.splitext(file) # getting current time current_time = datetime.now() # creating a new name for the recorded file new_name = 'recording-' + str(current_time.hour) + '.' + str(current_time.minute) + '.' + str(current_time.second) + ext # renaming the file os.rename(file, new_name) # display a message when recording is done showinfo('Recording complete', 'Your recording is complete') # function for catching all errors except: # display a message when an error is caught showerror(title='Error', message='An error occurred' \ '\nThe following could ' \ 'be the causes:\n->Bad duration value\n->An empty entry field\n' \ 'Do not leave the entry empty and make sure to enter a valid duration value')
Let's break the function's code to be on the same page. Inside the function, we have the
try/except block, the
except statement will catch all the errors and let the user know. Inside the
try block, we are declaring the sampling frequency variable called
freq, and after that, we get the duration from the entry via the
get() function, this duration is always in seconds.
We are then calling the recorder via the
sounddevice.rec() function, which takes
channels as arguments. After that, we declare a
counter variable and set it to 0; this will be used for tracking the recording progress.
We also have a
while loop that will run only if the
counter is less than the
duration. Inside this loop, we are updating the window using the
update() function which will occur after every second via the
time(1). We are incrementing the counter by one and displaying the counter via the progress label's
while loop, we are recording the audio via the
sounddevice.wait() function, after we are done, we save it using the
write() function from the
scipy module. The file is saved as
write() function, after the recording is done, will always save the file as
recording.wav, and if we try to record three times, we will not end up with three files but a single
recording.wav. This means that the currently recorded file will always overwrite the old one, which is not good because we want to keep all the recorded files.
So in the
for loop, we are looping through all the files in the current working folder, then we have an
if statement that checks if the file is
recording.wav, if the file is
recording.wav we will split its base and extension using the
os module like this:
base, ext = os.path.splitext(file)
After the splitting, we are getting the current time using the
datetime.now(), then we generate a new filename by this line of code:
new_name = 'recording-' + str(current_time.hour) + '.' + str(current_time.minute) + '.' + str(current_time.second) + ext
We are appending the extension and the strings
current_time.second to the base name. To rename the file, we have used:
After all this, the program displays a successful message when the recording is complete.
record_voice() function is doing so much that we will not run it directly, but we will run it as a thread via another function. Running the
record_voice() function as a thread comes in handy since it will run concurrently with the other tasks performed by the application. Below the
record_voice() function, paste this code:
# the function to run record_voice as a thread def recording_thread(): # creating the thread whose target is record_voice() t1 = threading.Thread(target=record_voice) # starting the thread t1.start()
About the code snippet, we are creating a function called
recording_thread(), in which we create a thread using the
Thread() class whose target is the
record_voice() function, then we are finally starting the thread.
Now we need to bind this thread function with the Record button, edit the button's code and make it look like this:
record_button = ttk.Button(window, text='Record', style='TButton', command=recording_thread)
We are all set. Let's now do our first recording, we will do a 10-second recording, and this is what you will get:
And if you check in the project's folder, you will see a new file that likes similar to this:
Let's try to do a second recording, you can enter any seconds as duration, and after a successful recording, you will get a new file:
To the file, we are appending the hours, minutes, and seconds of the current time; you can record as many files as you want, and none will be overwritten.
If the user left the entry empty or entered the wrong duration value, this is the output the application would produce:
The application is working as expected. Congratulations on creating your voice recorder application with Python!
That's it from this article; we now hope you have learned many concepts tied to Python and will apply them in future projects!
This article explained how to build a voice recorder application using Python. The first step was to set up the environment and install the required modules. Then, we designed the graphical user interface from the ground up. Finally, we implemented the record voice functionality and tested the application to ensure it worked properly.
You can get the complete code here.
Happy coding ♥
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