Sound Library

walterwright

MacBook Pro, OSX 10.13.4, Processing 3.3.7. Sound Library example sketch, when run no sound on the left channel, and it crashes on exit.

/**
 * Processing Sound Library, Example 5
 * 
 * This sketch shows how to use the FFT class to analyze a stream  
 * of sound. Change the variable bands to get more or less 
 * spectral bands to work with. The smooth_factor variable determines 
 * how much the signal will be smoothed on a scale form 0-1.
 */

import processing.sound.*;
SoundFile   sample;
FFT         fft;
AudioDevice device;

// Declare a scaling factor
int scale = 10;

// Define how many FFT bands we want
int bands = 16;

// declare a drawing variable for calculating rect width
float r_width;

// Create a smoothing vector
float[] sum = new float[bands];

// Create a smoothing factor
//float smooth_factor = 0.2;

void setup() {
  size(320,240);
  background(0);

  // If the Buffersize is larger than the FFT Size, the FFT will fail
  // so we set Buffersize equal to bands
  device=new AudioDevice(this,44100,bands);

  // Calculate the width of the rects depending on how many bands we have
  r_width = width/float(bands);

  // Load and play a soundfile and loop it. This has to be called 
  // before the FFT is created.
  // loop() crashes at end of file !!!
  sample=new SoundFile(this,"test.mp3");
  sample.play();
  // Create and patch the FFT analyzer
  fft=new FFT(this,bands);
  fft.input(sample);
}      

void draw() {
  background(0);
  fill(0,128,255);
  noStroke();
  fft.analyze();
  for (int i = 0; i < bands; i++) {
    //sum[i] += (fft.spectrum[i] - sum[i]) * smooth_factor;
    sum[i]=fft.spectrum[i];
    rect( i*r_width, height, r_width, -sum[i]*height*scale );
  }
}

koogs

edit post, highlight code , press ctrl-o to format.

minim is more mature than the sound library, try that.

walterwright

Thanks, I will give it a try 8^)))

walterwright

It appears the errors when using SoundFile. If, instead, I use the mic as input there are no errors.

koogs

I would double check your mp3.

walterwright

Thanks koogs. To be more specific, if I comment out the camera and analyze code, the sound file plays in stereo (no missing channel) with no errors. I'm pretty sure it's not the mp3.

walterwright

This is the error message - "ERROR: /synth/map/input: Audio input index 0 out of range for synth 2"