How can i make an Audio File loop continuously?

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Hello, im trying to make a simple Code, which allows me to loop an Audio File continuously.
i made a endless while loop, so that the Audio gets repeated, but it doesnt reload it and after the first Play, it get silenced.
Second Problem occur when the sound gets repeated via: ('Playcount=5' as an Exemple), i hear a millisecond cut between the replays, and i want to avoid that.
Any Ideas how can i solve this?
Thanks in advance.
Input = dsp.AudioFileReader('Sine_wave.wav',SamplesPerFrame=1024,PlayCount=5);
Output= audioDeviceWriter('SampleRate',Input.SampleRate);
while true
audio = Input();
Output(audio);
end
release(Input);
release(Output);
  2 Comments
Matlab_Beginner
Matlab_Beginner on 28 Aug 2022
Edited: Matlab_Beginner on 28 Aug 2022
Hey walter, i think that may be the case that this happens to be time equivalent to padding the end of the file to meet the SamplesPerFrame boundary. However Mr Michael has posted a perfect solution. now it loops without any cuts.
Im wondering if i could stop this infinite loop with a keystroke when matlab in running and the sound is going out(Esc, Enter..)?
Thanks in advance!

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Accepted Answer

Michael
Michael on 27 Aug 2022
Edited: Michael on 27 Aug 2022
Have you read this article? Real-Time Audio in MATLAB It looks like your code is similar to what they show for real-time file to audio output, which is good. Have you checked your audio file to be sure the 1ms isn't at the end of the file? I'd graph the samples to check that.
The more likely culprit is an underrun of sample in the buffer. See this article for a discussion on how to reduce underrun errors. https://www.mathworks.com/help/audio/gs/audio-io-buffering-latency-and-throughput.html
One more thing...it looks like you are reading from the file each loop. If the file isnt too big you could do the read before the loop and keep it in memory as a variable.
Input = dsp.AudioFileReader('Sine_wave.wav',SamplesPerFrame=1024,PlayCount=5);
Output= audioDeviceWriter('SampleRate',Input.SampleRate);
Audio = Input()
while true
Output(audio);
end
release(Input);
release(Output);
  7 Comments

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