public void setup() {
int window_height = 220;
size((int) (window_height * 5.12f), 220);
canvas = createGraphics((int) (window_height * 5.12f) / 2, 220, JAVA2D);
textMode(SCREEN);
textFont(createFont("SanSerif", 12));
minim = new Minim(this);
in = minim.getLineIn(Minim.MONO, buffer_size, sample_rate);
// create an FFT object that has a time-domain buffer
// the same size as line-in's sample buffer
fft = new FFT(in.bufferSize(), in.sampleRate());
// Tapered window important for log-domain display
fft.window(FFT.HAMMING);
// initialize peak-hold structures
peaksize = 1 + Math.round(fft.specSize() / binsperband);
peaks = new float[peaksize];
peak_age = new int[peaksize];
particles = new Particle[fft.specSize()];
for (int i = 0; i < fft.specSize(); i++) particles[i] = new Particle(i);
}
public void draw() {
background(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.mix);
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 / 2, i, height / 2 - fft.getBand(i) * 4);
}
stroke(255, 0, 0);
for (int beat : beats) {
float x = beat * width / totalSamples;
line(x, 0, x, height);
}
stroke(255, 255, 0);
float x = jingle.position() * width / jingle.length();
line(x, 0, x, height);
image(preview, 0, 0);
stroke(0, 255, 0);
float s = (float) width / samples.length;
line(loopStart * s, 0, loopStart * s, height);
line(loopEnd * s, 0, loopEnd * s, height);
}
public static List<Double> audioAnalysis(
String deviceName, String channel, long averages, NodeContext context) {
AudioSource source = (AudioSource) context.getData().get(deviceName + ".source");
if (source == null) return ImmutableList.of();
FFT fft = new FFT(source.bufferSize(), source.sampleRate());
fft.window(FFT.HANN);
if (averages > 0) fft.linAverages((int) averages);
if (channel.equals("left")) {
fft.forward(source.left);
} else if (channel.equals("right")) {
fft.forward(source.right);
} else {
fft.forward(source.mix);
}
ImmutableList.Builder<Double> b = new ImmutableList.Builder<Double>();
if (averages == 0) {
for (int i = 0; i < fft.specSize(); i++) b.add((double) fft.getBand(i));
} else {
for (int i = 0; i < fft.avgSize(); i++) b.add((double) fft.getAvg(i));
}
return b.build();
}
private void drawParticles() {
pushStyle();
colorMode(RGB, 255);
// background(0);
popStyle();
for (int i = 0; i < fft.specSize() - 1; i++) {
float val = dB_scale * (20 * ((float) Math.log10(fft.getBand(i))));
if (fft.getBand(i) == 0) {
val = -200;
} // avoid log(0)
particles[i].update(val);
particles[i].render();
}
}
