I want to increase/decrease volume of audio file using the slider,is it necessary to run audio data from slider?

global filename;
[y,Fs] = audioread(filename);
slider_val = get(hObject, 'Value');

if slider_val == 0
    x = y/5; % Decrease volume
    player = audioplayer(x, Fs);
    play(player,[1 (get(player, 'SampleRate')*3)]);
   
elseif slider_val == 1
    x = y*5; % Increase volume
    player = audioplayer(x, Fs); 
    play(player,[1 (get(player, 'SampleRate')*3)]);

Answer 1

[Walter Roberson]

You should use the Audio Systems Toolbox. At each point you would fetch a batch of samples and multiply them by the current slider value, and queue them to be played as audio.

Creating a separate audio player for each batch of sounds is too much overhead, and there is no feasible way to update the sound samples of an audioplayer once it is built.

[Madhav Sapkota]

Thank you Sir for your help.But instead of increasing/decreasing the sound ,there is lower in the speed of sound play. What change should I have to do in the following code?

slider_val = get(hObject, 'Value');

disp(get(hObject,'Value'));

k = slider_val;

player = audioplayer(k*x,Fs);

play(player);

guidata(hObject,handles);

[Walter Roberson]

if you set k to 1 then do you still hear aa speed change ?If you do then it has something to do with the sampling frequency not being right instead of the sample values .

[Madhav Sapkota]

Yes,Sir.Still there is change in speed in small amount. What might be the solution for this?

[Walter Roberson]

Post your current code.

[Madhav Sapkota]

[x,Fs]= audioread('G:\Year3\MediaTechnology\Assignment\Sune Khabar.mp3');

slider_val = get(hObject, 'Value'); % for getting the slider value

disp(get(hObject,'Value')); % displaying the slider value

k = slider_val; % Setting slidervalue in k

% player = audioplayer(x,Fs*k);

[loudness,loudnessRange] = integratedLoudness(x,Fs);

volume = [loudness*k,loudnessRange];

player = audioplayer(volume);

play(player); %play

guidata(hObject,handles);

[Walter Roberson]

you are not passing Fs as a parameter to audioplayer .