sound

/**
 * 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;

// Declare a scaling factor
float scale = 5.0;

// Declare a smooth factor
float smoothFactor = 0.25;

// Used for smoothing
float sum;

void setup() {
  size(640, 360);

  //Load and play a soundfile and loop it
  sample = new SoundFile(this, "beat.aiff");
  sample.loop();

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

void draw() {

  // Smooth the rms data by smoothing factor
  sum += (rms.analyze() - sum) * smoothFactor;

}