Analyzing two SoundFile objects at the same time

Processing Libraries
1

Hi there, I was setting up a test scene to, well, test stuff, when I stumbled across this problem : it would seem that I can’t analyze two SoundFile objects at the same time. I’ve tried with a WhiteNoise and an AudioIn and it works well with those, but using two SoundFile seems to make the sound library pouty. Here’s a simplified version of the code:

int bands = 512;
float[] lS = new float[bands];
float[] rS = new float[bands];
FFT lFft;
FFT rFft;
SoundFile left;
SoundFile right;

void setup()
{
  /*Things that weren't of particular interest were omitted*/
  lFft = new FFT(this, bands);
  rFft = new FFT(this, bands);

  left = new SoundFile("left.wav");
  left.play();
  right = new SoundFile("right.wav");
  right.play();

  lFft.input(left);
  rFft.input(right);
}

void draw()
{
  background(255);
  lFft.analyze(lS);
  rFft.analyze(rS);
  
  for(int i = 0; i < bands; i++)
  {
    line(i, height, i, height - lS[i]*height*5 );
    line(i, 0, i, rS[i]*height*5);
  } 
}

The output, which should consist of moving black lines at the top and bottom, ends up looking like this:

image
image.png510×511 1.25 KB

Thanks in advance for your help :slight_smile:

2

did you include “size”. in setup?

3

Yep, else I wouldn’t have a visual output at all, that’s why I omitted it.

4

actually here no problem:

Sound_FFT_2songs
Sound_FFT_2songs.png1112×805 36.2 KB

but i used .loop() ? your song 2 is short?