minim: detect peaks in amplitude while sound being played

plux

Hi there, I was wondering if there's a way to detect amplitude peaks in a sound file while being played. I don't need anything fancy really, I just need to find when the "volume" is above a certain level.

import ddf.minim.*;

Minim minim;
AudioPlayer player;

void setup()
{
  minim = new Minim(this);
  player = minim.loadFile("/data/samples/sample02.mp3");
  player.play();
}

void draw()
{  
  println("Gain: " + player.getGain()); //always prints 0.0 but I guess it's because it's not what I'm looking for
  println("Volume: " + player.getVolume()); //Minim error: Volume is not supported
}

Thank you!

kfrajer

I tried getGain and getVolume but they don't work

Please provide your code, your attempt.

Kf

plux

edited

jeremydouglass

@plux -- I believe you want: (untested)

if( player.right.level() > myThreshold ){
  doLoudEvent();
}

For related older discussion, see:

• https://forum.processing.org/two/discussion/25489/amplitude-analysis
• https://forum.processing.org/two/discussion/12762/is-this-example-reading-sound-amplitude-data

plux

to get the overall amp is it ok to get a simple average between the L/R channels? like (player.right.level() + player.left.level()) /2

jeremydouglass

It depends on what you are measuring. You could take the average, or the max, or you could look at perceptual loudness, e.g. based on the pan....

plux

I see..the average will do, thanks!