topical media & game development

topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

graphic-processing-site-examples-Libraries-Minim--Sound--FrequencyEnergy-FrequencyEnergy.pde / pde

Frequency Energy by Damien Di Fede. This sketch demonstrates how to use the BeatDetect object in FREQ_ENERGY mode. You can use <code>isKick</code>, <code>isSnare</code>, </code>isHat</code>, <code>isRange</code>, and <code>isOnset(int)</code> to track whatever kind of beats you are looking to track, they will report true or false based on the state of the analysis. To "tick" the analysis you must call <code>detect</code> with successive buffers of audio. You can do this inside of <code>draw</code>, but you are likely to miss some audio buffers if you do this. The sketch implements an <code>AudioListener</code> called <code>BeatListener</code> so that it can call <code>detect</code> on every buffer of audio processed by the system without repeating a buffer or missing one. This sketch plays an entire song so it may be a little slow to load.


  
  
  import ddf.minim.*;
  import ddf.minim.analysis.*;
  
  Minim minim;
  AudioPlayer song;
  BeatDetect beat;
  BeatListener bl;
  
  float kickSize, snareSize, hatSize;
  
  void setup()
  {
    size(512, 200, P3D);
    
    minim = new Minim(this);
    
    song = minim.loadFile("marcus_kellis_theme.mp3", 2048);
    song.play();
    // a beat detection object that is FREQ_ENERGY mode that 
    // expects buffers the length of song's buffer size
    // and samples captured at songs's sample rate
    beat = new BeatDetect(song.bufferSize(), song.sampleRate());
    // set the sensitivity to 300 milliseconds
    // After a beat has been detected, the algorithm will wait for 300 milliseconds 
    // before allowing another beat to be reported. You can use this to dampen the 
    // algorithm if it is giving too many false-positives. The default value is 10, 
    // which is essentially no damping. If you try to set the sensitivity to a negative value, 
    // an error will be reported and it will be set to 10 instead. 
    beat.setSensitivity(300);  
    kickSize = snareSize = hatSize = 16;
    // make a new beat listener, so that we won't miss any buffers for the analysis
    bl = new BeatListener(beat, song);  
    textFont(createFont("Helvetica", 16));
    textAlign(CENTER);
  }
  
  void draw()
  {
    background(0);
    fill(255);
    if ( beat.isKick() ) kickSize = 32;
    if ( beat.isSnare() ) snareSize = 32;
    if ( beat.isHat() ) hatSize = 32;
    textSize(kickSize);
    text("KICK", width/4, height/2);
    textSize(snareSize);
    text("SNARE", width/2, height/2);
    textSize(hatSize);
    text("HAT", 3*width/4, height/2);
    kickSize = constrain(kickSize * 0.95, 16, 32);
    snareSize = constrain(snareSize * 0.95, 16, 32);
    hatSize = constrain(hatSize * 0.95, 16, 32);
  }
  
  void stop()
  {
    // always close Minim audio classes when you are finished with them
    song.close();
    // always stop Minim before exiting
    minim.stop();
    // this closes the sketch
    super.stop();
  }

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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