Ohk, so I have a piece of code that generates a spectrogram, is there a way to warp the image, to get a more abstract visual? And even incorporate colour?
/**
* LiveSpectrogram
* Takes successive FFTs and renders them onto the screen as grayscale, scrolling left.
*
*/
import ddf.minim.analysis.*;
import ddf.minim.*;
Minim minim;
AudioInput in;
FFT fft;
int colmax = 500;
int rowmax = 256;
int[][] sgram = new int[rowmax][colmax];
int col;
int leftedge;
void setup()
{
size(512, 256, P3D);
textMode(SCREEN);
minim = new Minim(this);
in = minim.getLineIn(Minim.STEREO,2048);
fft = new FFT(in.bufferSize(), in.sampleRate());
fft.window(FFT.HAMMING);
}
void draw()
{
background(0);
stroke(255);
// perform a forward FFT on the samples in the input buffer
fft.forward(in.mix);
for(int i = 0; i < rowmax /* fft.specSize() */; i++)
{
// fill in the new column of spectral values
sgram[i][col] = (int)Math.round(Math.max(0,2*20*Math.log10(1000*fft.getBand(i))));
}
// next time will be the next column
col = col + 1;
// wrap back to the first column when we get to the end
if (col == colmax) { col = 0; }
// Draw points.
// leftedge is the column in the ring-filled array that is drawn at the extreme left
// start from there, and draw to the end of the array
for (int i = 0; i < colmax-leftedge; i++) {
for (int j = 0; j < rowmax; j++) {
stroke(sgram[j][i+leftedge]);
point(i,height-j);
}
}
// Draw the rest of the image as the beginning of the array (up to leftedge)
for (int i = 0; i < leftedge; i++) {
for (int j = 0; j < rowmax; j++) {
stroke(sgram[j][i]);
point(i+colmax-leftedge,height-j);
}
}
// Next time around, we move the left edge over by one, to have the whole thing
// scroll left
leftedge = leftedge + 1;
// Make sure it wraps around
if (leftedge == colmax) { leftedge = 0; }
}
void stop()
{
// always close Minim audio classes when you finish with them
in.close();
minim.stop();
super.stop();
}
