How can I ensure that when I click the play button more than once in my MATLAB GUI, the audio is played only once, regardless of how many times I press the play button?

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Ahmad 2024-1-1

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评论： Ahmad 2024-1-1

I am making an audio equalizer in MATLAB guide. When I press the 'play' button more than once, it plays the audio signal as many times as I've pressed the button. What I want is that when I press the play button more than once, it should only play the audio signal once.

The code for play button is given below:

% PLAY BUTTON

function pushbutton2_Callback(hObject, eventdata, handles)

% hObject handle to pushbutton2 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

audiofile = handles.fullpathname; % the input audio file is stored in "audiofile" variable.

[x, fs] = audioread(audiofile);

guidata(hObject, handles);

handles.CP=1;

% Storing the value of slider in respective variables.

slider_1 = get(handles.slider1, 'Value');

slider_2 = get(handles.slider2, 'Value');

slider_3 = get(handles.slider3, 'Value');

slider_4 = get(handles.slider4, 'Value');

slider_6 = get(handles.slider6, 'Value');

% Applying different filters on these variables.

filter1 = BPF63(x, slider_1);

filter2 = BPF250(x, slider_2);

filter3 = BPF1000(x, slider_3);

filter4 = BPF4000(x, slider_4);

filter6 = BPF16000(x, slider_6);

%Adding all these variables to make the new signal.

total = filter1 + filter2 + filter3 + filter4 + filter6;

sound(total,fs);

%Plotting the signals

plot(handles.axes1, 1:length(x),x);

grid on;

fourier = fft(x);

plot(handles.axes3, 1:length(fourier), abs(fourier));

grid on;

plot(handles.axes4, 1:length(total), total);

grid on;

total_fourier = fft(total);

plot(handles.axes5, 1:length(total_fourier), abs(total_fourier))

grid on;

end

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Answer 1

Sonesson 2024-1-1

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编辑：Sonesson 2024-1-1

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Hello Ahmad,

I am guessing this is done through the app designer?

A simple solution to this would be to disable the button after it is pressed, use the pause() function to stop any further matlab executions before the audiofile has played in its entierty, and then enabling it again.

A version of a matlab app doing this could look like

        % Button pushed function: PlayButton
        function PlayButtonPushed(app, event)
            %Disable the button
            set(app.PlayButton,'Enable','off');
            
            %Read and play the audio
            [x,fs] = audioread(app.FilePathEditField.Value);
            sound(x,fs);
            
            %you can add any of your plots etc either before 
            %or after the pause depending on desired effect
            
            %Wait for audio to finish
            pause(length(x)/fs); 
                                    
            %Re-enable the button
            set(app.PlayButton,'Enable','on')
        end