Music Visualizer using Processing - processing

Question

I'm trying to create a music visualizer using Processing. My idea is to have a line, across the entire screen, that moves accordingly with a song.
This is what I have, right now
import ddf.minim.analysis.*;
import ddf.minim.*;
Minim minim;
AudioPlayer track;
AudioInput input;
FFT fft;
//AudioIn in;
String audioFileName = "dune.mp3";
void setup()
{
//size(480, 320);
fullScreen();
noCursor();
minim = new Minim(this);
track = minim.loadFile(audioFileName, 2048);
input = minim.getLineIn();
fft = new FFT(input.bufferSize(), input.sampleRate());
}
void draw()
{
background(0);
stroke(255);
fft.forward(input.mix);
for (int i = 0; i < fft.specSize(); i++)
{
ellipse(i, 200, 7, fft.getBand(i)*10);
//line(0, 200, 200, fft.getBand(i));
}
}
So, my problems are:
the music that I'm loading, it's not working. (String audioFileName). Only the input, so when I talk to the microphone, works
I can't get a line, only the ellipse like the code
Does anyone knows how to solve this? Or has a good tutorial that I can follow?
Thank you

Answer 1

Your demo crashes on my Mac and will take me a while to debug. Perhaps the following demo which I copied from the web will get you started (see file header): http://code.compartmental.net/minim/minim_class_minim.html . It is heavily commented with several 'println' calls to hopefully give you some idea of how it works. You will need to create a 'data' folder in your Processing sketch folder and place a file named 'groove.mp3' inside the data folder in order to run it. I've tested it on my system and it seems to work ok. Does not use FFT.
/*
This sketch demonstrates how to play a file with Minim using an AudioPlayer.
It's also a good example of how to draw the waveform of the audio. Full documentation
for AudioPlayer can be found at http://code.compartmental.net/minim/audioplayer_class_audioplayer.html
For more information about Minim and additional features, visit http://code.compartmental.net/minim/
*/
import ddf.minim.*;
Minim minim;
AudioPlayer player;
void setup() {
size(512, 200);
// we pass this to Minim so that it can load files from the data directory
minim = new Minim(this);
println("minim = ", minim);
// loadFile will look in all the same places as loadImage does.
// this means you can find files that are in the data folder and the
// sketch folder. you can also pass an absolute path, or a URL.
player = minim.loadFile("groove.mp3");
println("player = ", player);
}
void draw() {
background(0);
stroke(255);
// draw the waveforms
// the values returned by left.get() and right.get() will be between -1 and 1,
// so we need to scale them up to see the waveform
// note that if the file is MONO, left.get() and right.get() will return the same value
for (int i = 0; i < player.bufferSize() - 1; i++) {
float x1 = map( i, 0, player.bufferSize(), 0, width );
float x2 = map( i+1, 0, player.bufferSize(), 0, width );
line( x1, 50 + player.left.get(i)*50, x2, 50 + player.left.get(i+1)*50 );
line( x1, 150 + player.right.get(i)*50, x2, 150 + player.right.get(i+1)*50 );
}
// draw a line to show where in the song playback is currently located
float posx = map(player.position(), 0, player.length(), 0, width);
stroke(0, 200, 0);
line(posx, 0, posx, height);
if ( player.isPlaying() ) {
text("Press any key to pause playback.", 10, 20 );
} else {
text("Press any key to start playback.", 10, 20 );
}
}
void keyPressed() {
if ( player.isPlaying() ) {
player.pause();
}
// if the player is at the end of the file,
// we have to rewind it before telling it to play again
else if ( player.position() == player.length() ) {
player.rewind();
player.play();
} else {
player.play();
}
}
The following is a revision of your initial post along with the reference that I used to debug it. 'Input' is the microphone and 'track' is the file; you had it set up to use the microphone and I switched it to the file. Just like the example above you will need to create a data folder in the Processing sketch folder and insert a file named 'groove.mp3'.
/*
Reference: https://github.com/ddf/Minim/blob/v2.2.2/examples/Analysis/SoundSpectrum/SoundSpectrum.pde
*/
import ddf.minim.analysis.*;
import ddf.minim.*;
Minim minim;
AudioPlayer track;
AudioInput input;
FFT fft;
String audioFileName = "groove.mp3";
void setup() {
size(480, 320);
noCursor();
minim = new Minim(this);
track = minim.loadFile(audioFileName, 1024);
input = minim.getLineIn();
fft = new FFT(track.bufferSize(), track.sampleRate());
println(fft);
track.loop();
}
void draw() {
background(0);
stroke(255);
fft.forward(track.mix);
for (int i = 0; i < fft.specSize(); i++) {
ellipse(i, 200, 7, fft.getBand(i)*10);
// line(0, 200, 200, fft.getBand(i)); //Unable to get this to work
}
}