Need help with Volume Slider GUI

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Nikos Korobos 2022-4-3

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编辑： Mohamed Turkmani 2022-9-7

采纳的回答： jibrahim

Hello everyone, I've been trying to code an audio player for wav files throught the Matlab GUI (App Designer).

Currently stuck on the volume slider function.

When I choose another volume level, the sound file restarts instead of continuing from the point I used the slider to adjust the volume level.

Any ideas?

My code so far:

Sample code I found online:

Thanks in advance!

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Nikos Korobos 2022-4-9

@jibrahim

@Raja Palanimurugan

I have also created an audio file player on μatlab, with Upload file and Play/Stop buttons.

Interested to code a display timer to show how long is the audio file while being played.

Can I use disp.AudioFileReader to count its length?

Need to count seconds in every loop.

Any suggestions appreciated.

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jibrahim 2022-4-4

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在 MATLAB Online 中打开

Hi Nikos,

Consider using audioDeviceWriter to play the audio, and dsp.AudioFileReader to read from the audio file. You do not need to restart these objects when you tune the volume gain.

% EXAMPLE: Read in an audio file and play it back using the standard
% audio device writer.
AFR = dsp.AudioFileReader('speech_dft.mp3');
ADW = audioDeviceWriter(AFR.SampleRate);
gain = 1;
while ~isDone(AFR)
    audio = AFR();
    ADW(gain*audio);
end
release(AFR);  % close the input file
release(ADW);  % close the audio output device

At a high level, you create AFR and ADW once in your app (at setup time). You feed the audio signal to ADW. Use the latest and greatest gain to scale the audio.

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Raja Palanimurugan 2022-4-12

Yes, that is correct.

Mohamed Turkmani 2022-9-7

编辑：Mohamed Turkmani 2022-9-7

@Raja Palanimurugan the volume still doesnt work even when i add the drawnow limitrate. can you please explain how to use it more? when i change the value for the first time it works , for the second time it gives this error

Error using audioDeviceWriter/setupImpl

A given audio device may only be opened once.

Error in generate_App/SpinnerValueChanging (line 510)

drawnow limitrate

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