Can someone help? Want to play a sound once from a loop

becca2404

I'm constantly looping through JSON of live earthquake data to check if there's new data.

What I want to do is to play about a 20 second clip only once when there's new data. For each magnitude I will have a different sound. I've tried delaying the frameRate but it still will play the sound again as it's in the loop. Any way of fixing this?

JSONObject earthJSON;
JSONArray earth;

import ddf.minim.*;

Minim minim;
AudioSample sound;

int mag;
String placecheck = " ";
String place;
int startTime;

void setup() {

 frameRate(0.1);
  size(512, 200, P3D);  
  minim = new Minim(this);
  sound = minim.loadSample( "sound.mp3");

}

void playSound(){
if (mag == 1){

  sound.trigger();

}

}   

void checkValue(){   
placecheck = place;

playSound();

}


void draw() { 

  earthJSON = loadJSONObject("http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_hour.geojson");

  earth = earthJSON.getJSONArray("features");
  //println(earth.size());


    mag = earth.getJSONObject(0).getJSONObject("properties").getInt("mag");
    place = earth.getJSONObject(0).getJSONObject("properties").getString("place");

    println("_________________________");
    println("mag: " + mag);   
    println("place: " + place);

    if (place != placecheck){
    checkValue();
    }




}

void stop()
{
minim.stop();

} 

KevinWorkman

Can't you store a boolean that keeps track of whether you've already played the sound? Then only play the sound when the boolean is false.

becca2404

Thanks for the suggestion but could you give an example of what you mean? I'm not overly experienced in Processing.

PhiLho

You should not rely on the frame rate to ensure the Json data isn't read too often. You should learn to use a timer with millis().

This technique can also be used to control the delay between two sounds.