Playing audio files repeatedly using minim.

Core Library Questions

daveg77

Playing audio files repeatedly using minim.

in Core Library Questions • 11 months ago

Hi,

I've written some code that interfaces to an Arduino board which is monitoring two metal objects for touch.

When one of the objects is touched the processing program plays one sound and when the other is touched it plays a different sound.

The sounds are stored as mp3 files and played using minim.

The sounds are played every time an object is touched.

To do this I was originally using,

noise = minim.loadfile("note.mp3");

noise.play();

The sound played fine and it felt like an instant response but it led to memory problems as the audio file was being loaded repeatedly. So I changed the code and used the .rewind() function/class instead of reloading the file. This cured the memory problems but introduced a noticeable delay.

Can anyone recommend a way to do this that won't lead to memory problems or introduce a delay?

Regards and thanks,

Dave.

Replies(3)

amnon.owed

Re: Playing audio files repeatedly using minim.

11 months ago

Removed double post. No need to post the exact same message twice. Your library uses a core library, so this is indeed the correct section.

Always load things (audio files, images, fonts, txt files, everything) in setup.

Use AudioSample and the trigger() method to play it. See the AudioSample example that comes with Minim.

daveg77

Re: Playing audio files repeatedly using minim.

11 months ago

Thanks for your reply and apologies for the double post.

I'll try that method out and see what happens.

Regards and thanks,

Dave.

daveg77

Re: Playing audio files repeatedly using minim.

11 months ago

I've written a short processing program to try this out, (see below). It runs but I get the following error message

"=== Minim Error ===

=== Likely buffer underrun in AudioOutput."

The mp3 audio file is about 0.9secs long and 16KB according to the file info.

The response isn't that quick either, there is a noticeable delay.

Any ideas what I'm doing wrong.

Thanks,

Dave.

import ddf.minim.*;

Minim minim;

AudioSample noiseA;

void setup()

{

minim = new Minim(this);

noiseA = minim.loadSample("note.mp3", 2048);

}

void draw()

{

// Do nothing here, just loop and respond to key presses.

}

void keyPressed()

{

if( key == 'a' )

{

PlayNoiseA();

}

if (key == 'q' )

{

noiseA.close();

minim.stop();

exit();

}

} // end function HandleKeyPress()

void PlayNoiseA()

{

noiseA.trigger();

println("Playing Noise A");

}

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