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

382 Learning Processing
used to play a WA V or AIFF fi le. WA V is an audio fi le format that stands for “ Waveform audio format ”
and is the standard format for PCs. AIFF stands for “ Audio Interchange File Format ” and is commonly
used on Macintosh computers.
All of the functions we looked at in Chapter 16 are available for a sound fi le. Th e main diff erence, of
course, is that we cannot use image( ) to display the Movie object since there is no image.
20.2
Example 20-1: Simple sound with video library
import processing.video.*;
Movie movie;
void setup() {
size(200, 200);
movie = new Movie (this, " dingdong.wav " );
}
void draw() {
background(0);
noLoop();
}
void mousePressed() {
movie.stop();
movie.play();
}
Exercise 20-1: Using the bouncing ball sketch from Example 5–6, play a sound eff ect every
time the ball bounces off a window’s edge.
Getting Started with Sonia and Minim
Th e Movie class will do for playing simple sound eff ects, but for more sophisticated playback
functionality, we will need to look at libraries designed for use with sound. We will start with Sonia
( http://sonia.pitaru.com/ ). First things fi rst, as with any contributed library, you fi rst need the import
statement at the top of your code.
import pitaru.sonia_v2_9.*;
Construct a Movie object with a WAV
(or AIFF) fi le.
The sound is played whenever the mouse is
pressed. Including the function stop() before
play() ensures that the sound fi le will play
from the beginning.
Sonia is an interface to a Java sound library, entitled Jsyn by Phil Burk. In order for it to work, Sonia has
to communicate with the audio playback and input hardware on your computer. Th is communication is
achieved via Jsyn. Before any sounds can be played, therefore, that link needs to be established, that is, the
sound engine needs to be started. Th is is done with the following line of code, which you would place in
setup( ) .