wave form trail

waveformtrail.pde

/**
  * This sketch demonstrates how to play a file with Minim using an AudioPlayer. <br />
  * It's also a good example of how to draw the waveform of the audio.
  * <p>
  * For more information about Minim and additional features, 
  * visit http://code.compartmental.net/minim/
  */

import ddf.minim.*;

Minim minim;
AudioPlayer player;

void setup()
{
  size(512, 200, P3D);
  
  // we pass this to Minim so that it can load files from the data directory
  minim = new Minim(this);
  
  // loadFile will look in all the same places as loadImage does.
  // this means you can find files that are in the data folder and the 
  // sketch folder. you can also pass an absolute path, or a URL.
  player = minim.loadFile("Dyman_-_03_-_Kill_The_Flesh.mp3");
  
  // play the file from start to finish.
  // if you want to play the file again, 
  // you need to call rewind() first.
  player.play();
}

void draw()
{
  background(0);
  stroke(255);
  
  // draw the waveforms
  // the values returned by left.get() and right.get() will be between -1 and 1,
  // so we need to scale them up to see the waveform
  // note that if the file is MONO, left.get() and right.get() will return the same value
  for(int i = 0; i < player.bufferSize() - 1; i++)
  {
    // use player.mix.level() for kirby scaling
    
    float x1 = map( i, 0, player.bufferSize(), 0, width );
    float x2 = map( i+1, 0, player.bufferSize(), 0, width );
    stroke(map(i, 0, 1024, 0, 255), 0, 0);
    line( x1, 50 + player.left.get(i)*50, x2, 50 + player.left.get(i+1)*50 );
    line( x1, 150 + player.right.get(i)*50, x2, 150 + player.right.get(i+1)*50 );
  }
}