audiograph

/**
 * Processing Sound Library, Example 6
 *
 * This sketch shows how to use the Amplitude class to analyze a
 * stream of sound. In this case a sample is analyzed. The smoothFactor
 * variable determines how much the signal will be smoothed on a scale
 * from 0 - 1.
 */

import processing.sound.*;

// Declare the processing sound variables
SoundFile sample;
Amplitude rms;
Boolean on = false;
String title = "4seasons";

// Declare a scaling factor
float scale = 4.0;

// Declare a smooth factor
float smoothFactor = 0.25;

// Used for smoothing
float sum;

void setup() {
  size(800, 800, P2D);
  smooth(8);
  background(238);

  //Load and play a soundfile and loop it
  sample = new SoundFile(this, title+".mp3");
  sample.loop();

  // Create and patch the rms tracker
  rms = new Amplitude(this);
  rms.input(sample);
}

void draw() {
  strokeWeight(1);
  noFill();
  if (on) {
    stroke(238, 10);
  } else {
    stroke(35, 10);
  }

  if (frameCount==4000) {
    save(title + "_" + frameCount +".png");  //on =! on;
    noLoop();
  }
  // Smooth the rms data by smoothing factor
  sum += (rms.analyze() - sum) * smoothFactor;

  // rms.analyze() return a value between 0 and 1. It's
  // scaled to height/2 and then multiplied by a scale factor
  float rmsScaled = sum * (height/2) * scale;

  // Draw an ellipse at a size based on the audio analysis
  ellipse(width/2, height/2, rmsScaled, rmsScaled);

  println(frameCount);
}

void keyPressed() {
  save(title + "_" + frameCount +".png");
}