What to do for Project 2?
Objectives
•
•
•
•
Tie back to Processing
Work with classes
Present a creative challenge
Work with a different programming language
Well three out of four objectives ain’t bad
Many Processing Libraries
•
•
•
•
•
•
•
Video
Serial
PDF Export
OpenGL
Arduino
Minim  Audio
Many more
Minim
• A Processing library that uses JavaSound API, Tritonus,
and MP3SPI to provide an easy to use audio library.
• Features:
–
–
–
–
–
–
–
AudioPlayer: for playback of WAV, AIFF, AU, SND, & MP3 files.
AudioMetaData: for metadata about a file, such as ID3 tags.
AudioSignal: for writing your own sound synthesis
AudioRecorder: for audio recording
AudioEffect: for writing your own audio effects.
FFT: for doing spectrum analysis.
BeatDetect: for doing beat detection.
A Sound Theory
• Mike Ruiz’s Sound Applets
• Minim FFT
Amplitude
Frequency
Music Visualization using Minim
• Options:
– Use the wave form
– Use the FFT (on previous slide)
– Use BeatDectect  Explained Here
The BeatDetect Class (by Example)
(SOUND_ENERGY mode)
import ddf.minim.*;
import ddf.minim.analysis.*;
Minim minim;
AudioPlayer song;
BeatDetect beat;
void setup() {
minim = new Minim(this);
song = minim.loadFile("TicketToRide.mp3");
song.play();
beat = new BeatDetect();
beat.setSensitivity(100);
}
void draw() {
beat.detect(song.mix);
if( beat.isOnset() )
{
…
}
…
}
void stop() {
song.close();
minim.stop();
super.stop();
}
Example Program
The BeatDetect Class (by Example)
(FREQ_ENERGY mode)
import ddf.minim.*;
import ddf.minim.analysis.*;
Minim minim;
AudioPlayer song;
BeatDetect beat;
BeatListener bl;
class BeatListener implements AudioListener {
private BeatDetect beat;
private AudioPlayer source;
…
}
void setup() {
minim = new Minim(this);
song = minim.loadFile("TicketToRide.mp3",
32768);
song.play();
beat = new BeatDetect(song.bufferSize(),
song.sampleRate());
beat.setSensitivity(200);
bl = new BeatListener(beat, song);
}
…
Buffer size must be a power of 2
Example Program
A Little Insight into Beat Detection
• Use the drawGraph() method to see the
energy levels.
• Example program
Project 2
• Presented at the time of
our final:
Tuesday, May 3 @11:30
• Project 2
• Seniors, please talk to me
about the due date.
Resources
•
•
•
•
•
•
•
•
Main documentation
Processing Page Examples
Minim Code Log Examples
Doorbell example by Daniel Shiffman
Audio Processing Examples by Dan Ellis
Vimeo video tutorial 4 and video tutorial 5
OpenProcessing Examples
Beatles Ukulele Project (a source of .mp3 files)