Help with Audio Visualizer

blenda_splenda

Hello! I am trying to create an audio visualizer. I am using live sound. The problem I keep coming into is the nullpointer exception error. Please take a look at this code and give me some tips on how to fix this! Thank you.

import ddf.minim.analysis.*; import ddf.minim.*;

Minim minim; AudioPlayer jingle; AudioInput input; FFT fft; int[][] colo = new int[100][10];

float color1 = 35;> float color2 = 45; float color3 = 65; float color4 = 75;

void setup() { size(512, 400); background(0); colorMode(HSB,100,100,100,100);

minim = new Minim(this);

input = minim.getLineIn();

fft = new FFT(input.bufferSize(), input.sampleRate());

}

void draw() { background(0); noStroke(); fill(0, 5); rect(0, 0, width, height); pushMatrix(); translate(width/2, height/2); rotate(radians(frameCount % 360 * 2));

fft.forward(input.mix);

for(int i = 0; i < fft.specSize(); i++) {

  if(jingle.mix.get(i)*200 > fft.specSize()) {
    stroke(color1,100,100);
  }
  else {
    stroke(color2,100,100);
  }

  line(cos(i)*50, sin(i)*50, cos(i)*abs(jingle.left.get(i))*200 + cos(i)*50, sin(i)*abs(jingle.right.get(i))*200 + sin(i)*50);
}

for(int j = fft.specSize(); j > 0; j--) {

    if(jingle.mix.get(j)*200 > fft.specSize()) {
    stroke(color3,100,100);
  }
  else {
    stroke(color4,100,100);
  }


  line(cos(j)*50, sin((j))*50, cos(j)*abs(jingle.right.get(j))*200 + cos(j)*50, sin(j)*abs(jingle.left.get(j))*200 + sin(j)*50);   
}

popMatrix(); }

void keyPressed() {

if(key == 'r') { color1 = 0; color2 = 5; color3 = 90; color4 = 95; }

if(key == 'g') { color1 = 35; color2 = 45; color3 = 65; color4 = 75; } }

Chrisir

step 1 - code almost unchanged but better formatted

import ddf.minim.analysis.*; 
import ddf.minim.*;

Minim minim; 
AudioPlayer jingle; 
AudioInput input; 
FFT fft; 
int[][] colo = new int[100][10];

float color1 = 35;
float color2 = 45; 
float color3 = 65; 
float color4 = 75;

void setup() {

  size(512, 400); 
  background(0); 
  colorMode(HSB, 100, 100, 100, 100);

  minim = new Minim(this);
  println("2");
  input = minim.getLineIn();
  println("3");
  fft = new FFT(input.bufferSize(), input.sampleRate());
  println("4");
}

void draw() {

  background(0);

  noStroke(); 
  fill(0, 5); 
  rect(0, 0, width, height);

  pushMatrix(); 
  translate(width/2, height/2); 
  rotate(radians(frameCount % 360 * 2));

  fft.forward(input.mix);

  for (int i = 0; i < fft.specSize(); i++) {

    if (jingle.mix.get(i)*200 > fft.specSize()) {
      stroke(color1, 100, 100);
    } else {
      stroke(color2, 100, 100);
    }

    line(cos(i)*50, sin(i)*50, 
      cos(i)*abs(jingle.left.get(i))*200 + cos(i)*50, sin(i)*abs(jingle.right.get(i))*200 + sin(i)*50);
  }

  for (int j = fft.specSize(); j > 0; j--) {

    if (jingle.mix.get(j)*200 > fft.specSize()) {
      stroke(color3, 100, 100);
    } else {
      stroke(color4, 100, 100);
    }


    line(cos(j)*50, sin((j))*50, 
      cos(j)*abs(jingle.right.get(j))*200 + cos(j)*50, 
      sin(j)*abs(jingle.left.get(j))*200 + sin(j)*50);
  }

  popMatrix();
}

void keyPressed() {

  if (key == 'r') { 
    color1 = 0; 
    color2 = 5; 
    color3 = 90; 
    color4 = 95;
  }

  if (key == 'g') { 
    color1 = 35; 
    color2 = 45; 
    color3 = 65; 
    color4 = 75;
  }
}

blenda_splenda

import ddf.minim.analysis.*;
import ddf.minim.*;

BeatDetect heart = new BeatDetect();
Minim       minim;
AudioPlayer jingle;
FFT         fft;

void setup(){
  size(512, 200, P3D);

  minim = new Minim(this);

  // specify that we want the audio buffers of the AudioPlayer
  // to be 1024 samples long because our FFT needs to have 
  // a power-of-two buffer size and this is a good size.
  jingle = minim.loadFile("Forbidden Voices.mp3", 1024);

  // loop the file indefinitely
  jingle.loop();

  // create an FFT object that has a time-domain buffer 
  // the same size as jingle's sample buffer
  // note that this needs to be a power of two 
  // and that it means the size of the spectrum will be half as large.
  fft = new FFT( jingle.bufferSize(), jingle.sampleRate() );

}

void draw()
{
  background(0);
  heart.detect( jingle.right );  
  if( heart.isOnset() ){
    background(255,0,0);
  }

  stroke(255);

  // perform a forward FFT on the samples in jingle's mix buffer,
  // which contains the mix of both the left and right channels of the file
  fft.forward( jingle.right );

  for(int i = 0; i < fft.specSize(); i++)
  {
    // draw the line for frequency band i, scaling it up a bit so we can see it
    line( i, height, i, height - fft.getBand(i)*8 );
  }
}

How could I change this into a 3D environment based on the FFT - I want to make a 3D spectral analysis graph of the audio.

Chrisir

there is a 3D version of line with xyz to xyz - see reference

use another property of fft to use as Z-Value

blenda_splenda

I realize that the property would be inserted here:

line(i, height, ____, height - fft.getBand(i)*8);

I am wondering what the property would be?