Learning Processing: A Beginner's Guide to Programming Images ...

void setup() {
Sonia.start(this);
}
Sound 383
Now, it would be rather irresponsible of us to make this connection to the sound hardware, but never
bother to close it down when we are fi nished. By now, the fl ow of a Processing sketch is all too familiar,
start with setup( ) , loop with draw( ) , and stop whenever you quit the sketch. Th e thing is, we want to
terminate the sound engine during that last step, when the sketch quits. Fortunately, there is an extra
hidden function we can implement entitled stop( ) that does precisely that. When a sketch quits, any
last minute instructions can be executed inside the stop( ) function. Th is is where we will shut down the
Sonia engine.
void stop() {
Sonia.stop();
super.stop();
}
Sonia.stop( ) is the call to stop Sonia. Th ere is also, however, the line super.stop( ) . Th e meaning of “ super ”
will be explored further in Chapter 22. For now, we can understand that line of code as saying “ Oh,
whatever else you would normally do in stop( ) , do that stuff , too . ”
All of the above applies to Minim as well. Here is the corresponding code:
20.3
import ddf.minim.*;
void setup() {
size(200, 200);
Minim.start(this);
}
void stop() {
super.stop();
}
Basic Sound Playback
Once this call to the library has been made, you have the whole world (of sound) in your hands. We
will start by demonstrating how to play sound fi les. Before a sound can be played, it must be loaded into
memory, much in the same way we loaded image fi les before displaying them. With Sonia , a Sample
object is used to store a reference to a sound sample.
Sample dingdong;
Th e object is initialized by passing the sound fi lename to the constructor.
dingdong = new Sample( "dingdong.wav");
Start the Minim sound engine!
With Minim, sounds will be closed
individually here. We will see this
in a moment.
The fi le “dingdong.wav” should be placed in
the data directory.