public void analyze(int start) {
diffs.clear();
loopStart = start;
int SUB = 64;
int N = 2048 * SUB;
float maxDiff = 0;
int upper = (int) min(samples.length - N, start + 30 * jingle.getFormat().getSampleRate());
for (int i = start + N; i < upper - N; i++) {
if (i % 10000 == 0) System.out.println(i + "/" + (upper - start));
float diff = 0;
for (int j = 0; j < N; j += SUB) {
diff += Math.abs(samples[i + j] - samples[start + j]);
}
maxDiff = max(maxDiff, diff);
diffs.put(i, new PVector(i, diff));
}
preview.beginDraw();
preview.clear();
preview.noFill();
preview.stroke(255);
preview.beginShape();
for (int i = 0; i <= width; i++) {
preview.vertex(
i, preview.height / 2 + height / 2 * samples[(int) (i * (samples.length - 1l) / width)]);
}
preview.endShape();
preview.endDraw();
preview.beginDraw();
preview.clear();
preview.stroke(255, 0, 0);
preview.beginShape();
int n = 0;
int prevX = 0;
float sum = maxDiff;
for (PVector diff : diffs.values()) {
int x = (int) (diff.x * (long) width / samples.length);
sum = min(diff.y, sum);
n = 1;
if (x != prevX) {
preview.vertex(x, preview.height * sum / maxDiff / n);
n = 0;
sum = maxDiff;
prevX = x;
}
}
preview.endShape();
preview.endDraw();
}
@Override
public void keyPressed() {
if (key == 'r') {
loopEnd = (int) (mouseX * (long) samples.length / width);
}
if (key == 'a') {
PVector best = new PVector(0, Float.MAX_VALUE);
int sampleNr = (int) (mouseX * (long) samples.length / width);
for (int i = sampleNr - 500000; i < sampleNr + 500000; i++) {
PVector diff = diffs.get(i);
if (diff != null) {
if (diff.y < best.y) best = diff;
}
}
if (best.x != 0) {
loopEnd = (int) best.x;
}
}
if (keyCode == RIGHT) {
jingle.cue((int) (loopEnd * 1000l / jingle.getFormat().getSampleRate() - 1000));
}
}
