Hi.. i think this should be easy but i'm really new to Processing and cant seem to implement this.

I want the following beat detect example code to work off a live input from my mac laptop mic. I've tried changing the 'song' variable to a line in like this;

lineIn = minim.getLineIn(Minim.STEREO, 512);

but keep running into problems with the object/class types not matching up. I think? Any suggestions would be great! Thanks.


//----------------------------
import ddf.minim.*;
import ddf.minim.analysis.*;

Minim minim;
AudioPlayer song;
BeatDetect beat;
BeatListener bl;
AudioInput in;

float kickSize, snareSize, hatSize;

void setup()
{
 size(512, 200);
 smooth();
 
 minim = new Minim(this);
 
 song = minim.loadFile("test.mp3", 2048);
 song.play();
 // a beat detection object that is FREQ_ENERGY mode that
 // expects buffers the length of song's buffer size
 // and samples captured at songs's sample rate
 beat = new BeatDetect(song.bufferSize(), song.sampleRate());
 // set the sensitivity to 300 milliseconds
 // After a beat has been detected, the algorithm will wait for 300 milliseconds
 // before allowing another beat to be reported. You can use this to dampen the
 // algorithm if it is giving too many false-positives. The default value is 10,
 // which is essentially no damping. If you try to set the sensitivity to a negative value,
 // an error will be reported and it will be set to 10 instead.
 beat.setSensitivity(100);  
 kickSize = snareSize = hatSize = 16;
 // make a new beat listener, so that we won't miss any buffers for the analysis
 bl = new BeatListener(beat, song);  
 textFont(createFont("SanSerif", 16));
 textAlign(CENTER);
}

void draw()
{
 background(0);
 fill(255);
 if ( beat.isKick() ) kickSize = 32;
 if ( beat.isSnare() ) snareSize = 32;
 if ( beat.isHat() ) hatSize = 32;
 textSize(kickSize);
 text("KICK", width/4, height/2);
 textSize(snareSize);
 text("SNARE", width/2, height/2);
 textSize(hatSize);
 text("HAT", 3*width/4, height/2);
 kickSize = constrain(kickSize * 0.95, 16, 32);
 snareSize = constrain(snareSize * 0.95, 16, 32);
 hatSize = constrain(hatSize * 0.95, 16, 32);
}

void stop()
{
 // always close Minim audio classes when you are finished with them
 song.close();
 // always stop Minim before exiting
 minim.stop();
 // this closes the sketch
 super.stop();
}



class BeatListener implements AudioListener
{
 private BeatDetect beat;
 private AudioPlayer source;
 
 BeatListener(BeatDetect beat, AudioPlayer source)
 {
   this.source = source;
   this.source.addListener(this);
   this.beat = beat;
 }
 
 void samples(float[] samps)
 {
   beat.detect(source.mix);
 }
 
 void samples(float[] sampsL, float[] sampsR)
 {
   beat.detect(source.mix);
 }
}

Yeah i've tried that.. i must still be missing something. Instead of only creating a bird when various beats are detected, the program starts sptting them out even when i'm not playing audio and doesnt seem to be affected by sound when i do start playing?

http://pastebin.com/f54d06852

Cheers.

oh thanks.. i'm on a mac and want to use the built in mic. I couldnt find a reference to it in the example file i was using.. where would i put this?

yeah i tried that also.. i'll have a search around for more info about using this on a mac.

You are trying to pass in a BeatDetect object and an AudioInput object to the BeatListener constructor but the BeatListener constructor only accepts a BeatDetect object and an AudioPlayer object. (Hence the The constructor Frequency BeatListener{BeatDetect, AudioInput) is undefined )

Go to the BeatListener class (it should be a tab called BeatListener) and if you change every instance of AudioPlayer to AudioInput, you should be fine.