Turning on (& off) a webcam reacting to sound

Core Library Questions

mennoes

Turning on (& off) a webcam reacting to sound

in Core Library Questions • 5 months ago

Hello guys,

I am trying to build a sketch where a webcam can be triggered on by using the audio: If the webcam records a audio volume of 'x' the webcam turns on. When it reaches this level again it will go off.

I've already made such a sketch in Max MSP but I want to figure out how to make it in Processing, never worked with the program before so I am a complete stranger.

The code i've found was one which turned a webcam off after a mouseclick;

import processing.video.*;
Capture cam;
void setup() {
size(640, 480);
cam = new Capture(this);
cam.start();
}
void draw() {
if (cam.available()) {
// Reads the new frame
cam.read();
}
image(cam, 0, 0);
}
void mousePressed() {
cam.stop();
}

Replies(3)

mennoes

Re: Turning on (& off) a webcam reacting to sound

4 months ago

Any1?

v.k.

Re: Turning on (& off) a webcam reacting to sound

4 months ago

Look for minim, a core library that deals with sound. You will use it to measure the sound, and than adapt it to replace mouse in the code above. There are a lot of examples, either built in Processing and in the forum. I remember a recent one making ellipses as the sound increase, let me see... well can't find it in the forum, but i happen to have copied the code, so here it is. Is not my code but is available in the forum anyway... It should get you started. Ask here if you need more help. Good luck.

code copied from forum:

import ddf.minim.*;
Minim minim;
AudioInput in;
int reactLast;
int reactBetween = 100;
float soundIntensity = 1;
ArrayList <Circle> circles = new ArrayList <Circle> ();
void setup() {
size(600, 600);
strokeWeight(3);
smooth();
noFill();
minim = new Minim(this);
in = minim.getLineIn(Minim.MONO, 64);
}
void draw() {
background(0);
float sound = 0;
for (int i=0; i<in.bufferSize()-1; i++) {
sound += in.left.get(i);
}
if (abs(sound)>soundIntensity&&millis()-reactLast>reactBetween) {
reactLast = millis();
circles.add( new Circle( new PVector(width/2,height/2),255));
}
for (int i=circles.size()-1; i>=0; i--) {
Circle c = circles.get(i);
c.run();
}
}
class Circle {
PVector pos;
color c;
int age;
Circle(PVector _pos, color _c) {
pos = _pos;
c = _c;
}
void run() {
stroke(c, max(0, 255-age*0.25));
ellipse(pos.x, pos.y, age*1.5, age*1.5);
age += 3;
if (age>600) {
circles.remove(this);
}
}
}
void stop() {
in.close();
minim.stop();
super.stop();
}

mennoes

Re: Turning on (& off) a webcam reacting to sound

4 months ago

Thanks for the help, but still... no clue how to make it? Anyone ells?

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