playing a nonstop audio file

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Mohamed Turkmani
Mohamed Turkmani 2022-9-6
编辑： Mohamed Turkmani 2022-9-7
how can i play an audio file without stopping kinda like a loop in app designer
[y,Fs] = audioread(app.files);
sound(y,Fs)
this will just play it once

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回答（1 个）

jibrahim
jibrahim 2022-9-6
You can use dsp.AudioFileReader with PlayCount set to Inf:
afr = dsp.AudioFileReader('speech_dft.mp3','PlayCount',Inf);
adw = audioDeviceWriter('SampleRate', afr.SampleRate);
while ~isDone(afr)
audio = afr();
adw(audio);
end
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jibrahim
jibrahim 2022-9-6
You can control the range of the signal you want to play with the ReadRange property:
afr = dsp.AudioFileReader('speech_dft.mp3','PlayCount',Inf,'ReadRange', [start finish]);
Increasing the volume can be done by simply multiplying 'audio' by a constant of your choice.
Regarding the error, in your app, first clear your workspace, then make sure the object afr is only created once (say in setup of your app) and then somply call it in the loop. Do not recreate every time in your loop.
Mohamed Turkmani
Mohamed Turkmani 2022-9-7
编辑：Mohamed Turkmani 2022-9-7
ok it is working the problem is when i press the button to increas the volume, it doesnt work in real time, it waits until the audio is done and repeats with the increased volume

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