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MusicAnalyzer.java
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MusicAnalyzer.java
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import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import org.jfugue.*;
import com.esotericsoftware.wildcard.*;
import javax.sound.midi.InvalidMidiDataException;
/**
* Analyzes a series of MIDI files, producing first-order and second-order Markov Chains which represent <br>
* the probability of one note following another and one note following a sequence of two notes, respectively.
*
* @author Harry Allen
*/
public class MusicAnalyzer
{
private ArrayList<ArrayList<Double>> prob; // Markov chain: stores the probability vector for each note
private ArrayList<ArrayList<ArrayList<Double>>> secondProb; // Markov chain: stores the probability vector for each combination of the current note and immediately preceding note
private int key; // Current key signature
/**
* Default constructor.
*/
public MusicAnalyzer()
{
prob = new ArrayList<ArrayList<Double>>();
secondProb = new ArrayList<ArrayList<ArrayList<Double>>>();
key = 1;
resetProbabilities();
analyzePitch();
analyzePitchSecondOrder();
}
/**
* @param note note of the probability vector to return
* @return The probability vector for the note accepted as the parameter
*/
public ArrayList<Double> getProbability(int note)
{
return prob.get(note);
}
/**
* @param prevnote second to last note recorded in the score
* @param note last note recorded in the score
* @return the probability vector based on the previous two notes recorded. If no prevnote has been recorded, will default to first order prob.
*/
public ArrayList<Double> getSecondProb(int prevnote, int note)
{
if (prevnote != -1)
return secondProb.get(note).get(prevnote);
else
return prob.get(note);
}
/**
* @return Integer representing key signature
*/
public int getKey()
{
return key;
}
/**
* Sets key signature to the integer passed in, resets the probabilities, and analyzes MIDI files in the new key.
*
* @param newkey new key signature
*/
public void setKey(int newkey)
{
if (newkey != key)
{
if (newkey >= 1 && newkey <= 12)
key = newkey;
else
key = 1;
resetProbabilities();
analyzePitch();
analyzePitchSecondOrder();
}
}
/**
* Resets all probability vectors to 0.0 in preparation for another call to analyze() and analyzeSecondOrder().
*/
public void resetProbabilities()
{
prob.clear();
secondProb.clear();
for (int i = 0; i < 12; ++i)
{
prob.add(new ArrayList<Double>());
secondProb.add(new ArrayList<ArrayList<Double>>());
}
for (ArrayList<Double> list : prob)
{
for (int i = 0; i < 12; ++i)
list.add(0.0);
}
for (ArrayList<ArrayList<Double>> list : secondProb)
{
for (int i = 0; i < 12; ++i)
list.add(new ArrayList<Double>());
}
for (ArrayList<ArrayList<Double>> list : secondProb)
{
for (ArrayList<Double> x : list)
{
for (int i = 0; i < 12; ++i)
x.add(0.0);
}
}
}
/**
* Performs a basic analysis of the MIDI files in the MIDIs folder. Based on the given MIDI files the method will generate a first-order Markov Chain which will give the likelihood of a note being
* chosen based on the previous note.
*/
public void analyzePitch()
{
Player player = new Player();
ArrayList<Double> note;
String musicstring = "";
char[] music;
Paths midis = getPath();
// Run analysis on each MIDI file
for (File midi : midis.getFiles())
{
try
{
Pattern pat = player.loadMidi(midi);
musicstring = pat.getMusicString();
}
catch (InvalidMidiDataException e)
{
System.out.println(e.toString());
}
catch (IOException e)
{
System.out.println(e.toString());
}
music = musicstring.toCharArray();
int prevnote = -1;
for (int i = 0; i < music.length; ++i)
{
if (prevnote != -1)
note = prob.get(prevnote);
else
{
note = new ArrayList<Double>();
for (int j = 0; j < 12; ++j)
note.add(0.0);
}
switch (music[i])
{
case 'C':
if (prevnote == -1)
break;
else if (music[i + 1] == '#')
note.set(1, note.get(1) + 1);
else
note.set(0, note.get(0) + 1);
break;
case 'D':
if (prevnote == -1)
break;
else if (music[i + 1] == 'b')
note.set(1, note.get(1) + 1);
else if (music[i + 1] == '#')
note.set(3, note.get(3) + 1);
else
note.set(2, note.get(2) + 1);
break;
case 'E':
if (prevnote == -1)
break;
else if (music[i + 1] == 'b')
note.set(3, note.get(3) + 1);
else
note.set(4, note.get(4) + 1);
break;
case 'F':
if (prevnote == -1)
break;
else if (music[i + 1] == '#')
note.set(6, note.get(6) + 1);
else
note.set(5, note.get(5) + 1);
break;
case 'G':
if (prevnote == -1)
break;
else if (music[i + 1] == 'b')
note.set(6, note.get(6) + 1);
else if (music[i + 1] == '#')
note.set(8, note.get(8) + 1);
else
note.set(7, note.get(7) + 1);
break;
case 'A':
if (prevnote == -1)
break;
else if (music[i + 1] == 'b')
note.set(8, note.get(8) + 1);
else if (music[i + 1] == '#')
note.set(10, note.get(10) + 1);
else
note.set(9, note.get(9) + 1);
break;
case 'B':
if (prevnote == -1)
break;
else if (music[i + 1] == 'b')
note.set(10, note.get(10) + 1);
else
note.set(11, note.get(11) + 1);
break;
}
switch (music[i])
{
case 'C':
if (music[i + 1] == '#')
{
prevnote = 1;
i = i + 2;
}
else
{
prevnote = 0;
++i;
}
break;
case 'D':
if (music[i + 1] == 'b')
{
prevnote = 1;
i = i + 2;
}
else if (music[i + 1] == '#')
{
prevnote = 3;
i = i + 2;
}
else
{
prevnote = 2;
++i;
}
break;
case 'E':
if (music[i + 1] == 'b')
{
prevnote = 3;
i = i + 2;
}
else
{
prevnote = 4;
++i;
}
break;
case 'F':
if (music[i + 1] == '#')
{
prevnote = 6;
i = i + 2;
}
else
{
prevnote = 5;
++i;
}
break;
case 'G':
if (music[i + 1] == 'b')
{
prevnote = 6;
i = i + 2;
}
else if (music[i + 1] == '#')
{
prevnote = 8;
i = i + 2;
}
else
{
prevnote = 7;
++i;
}
break;
case 'A':
if (music[i + 1] == 'b')
{
prevnote = 8;
i = i + 2;
}
else if (music[i + 1] == '#')
{
prevnote = 10;
i = i + 2;
}
else
{
prevnote = 9;
++i;
}
break;
case 'B':
if (music[i + 1] == 'b')
{
prevnote = 10;
i = i + 2;
}
else
{
prevnote = 11;
++i;
}
break;
}
}
}
// Iterate through each note's probability vector and calculate the probability of a given note being chosen
for (int k = 0; k < prob.size(); ++k)
{
ArrayList<Double> list = prob.get(k);
double x = 0.0;
double sum = 0.0;
for (Double y : list)
sum += y;
for (int l = 0; l < list.size(); ++l)
{
x = list.get(l);
if (sum != 0)
list.set(l, (x / sum));
}
}
}
/**
* Performs an analysis of the MIDI files in the MIDIs folder. Based on the given MIDI files the method will generate a second-order Markov Chain which will give the likelihood of a note being
* chosen based on the previous two notes.
*/
public void analyzePitchSecondOrder()
{
Player player = new Player();
ArrayList<Double> note; // Temporarily stores musical data to calculate probabilities
int[] prevnotes = { -1, -1 };
String musicstring = "";
char[] music; // Stores music from MIDI files
Paths midis = getPath();
// Run analysis on each MIDI file
for (File midi : midis.getFiles())
{
try
{
Pattern pat = player.loadMidi(midi);
musicstring = pat.getMusicString();
}
catch (InvalidMidiDataException e)
{
System.out.println(e.toString());
}
catch (IOException e)
{
System.out.println(e.toString());
}
music = musicstring.toCharArray();
for (int i = 0; i < music.length; ++i)
{
if (prevnotes[0] != -1 && prevnotes[1] != -1)
note = secondProb.get(prevnotes[1]).get(prevnotes[0]);
else
{
note = new ArrayList<Double>();
for (int j = 0; j < 12; ++j)
note.add(0.0);
}
switch (music[i])
{
case 'C':
if (prevnotes[0] == -1 || prevnotes[1] == -1)
break;
else if (music[i + 1] == '#')
note.set(1, note.get(1) + 1);
else
note.set(0, note.get(0) + 1);
break;
case 'D':
if (prevnotes[0] == -1 || prevnotes[1] == -1)
break;
else if (music[i + 1] == 'b')
note.set(1, note.get(1) + 1);
else if (music[i + 1] == '#')
note.set(3, note.get(3) + 1);
else
note.set(2, note.get(2) + 1);
break;
case 'E':
if (prevnotes[0] == -1 || prevnotes[1] == -1)
break;
else if (music[i + 1] == 'b')
note.set(3, note.get(3) + 1);
else
note.set(4, note.get(4) + 1);
break;
case 'F':
if (prevnotes[0] == -1 || prevnotes[1] == -1)
break;
else if (music[i + 1] == '#')
note.set(6, note.get(6) + 1);
else
note.set(5, note.get(5) + 1);
break;
case 'G':
if (prevnotes[0] == -1 || prevnotes[1] == -1)
break;
else if (music[i + 1] == 'b')
note.set(6, note.get(6) + 1);
else if (music[i + 1] == '#')
note.set(8, note.get(8) + 1);
else
note.set(7, note.get(7) + 1);
break;
case 'A':
if (prevnotes[0] == -1 || prevnotes[1] == -1)
break;
else if (music[i + 1] == 'b')
note.set(8, note.get(8) + 1);
else if (music[i + 1] == '#')
note.set(10, note.get(10) + 1);
else
note.set(9, note.get(9) + 1);
break;
case 'B':
if (prevnotes[0] == -1 || prevnotes[1] == -1)
break;
else if (music[i + 1] == 'b')
note.set(10, note.get(10) + 1);
else
note.set(11, note.get(11) + 1);
break;
}
switch (music[i])
{
case 'C':
if (music[i + 1] == '#')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 1;
i = i + 2;
}
else
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 0;
++i;
}
break;
case 'D':
if (music[i + 1] == 'b')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 1;
i = i + 2;
}
else if (music[i + 1] == '#')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 3;
i = i + 2;
}
else
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 2;
++i;
}
break;
case 'E':
if (music[i + 1] == 'b')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 3;
i = i + 2;
}
else
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 4;
++i;
}
break;
case 'F':
if (music[i + 1] == '#')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 6;
i = i + 2;
}
else
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 5;
++i;
}
break;
case 'G':
if (music[i + 1] == 'b')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 6;
i = i + 2;
}
else if (music[i + 1] == '#')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 8;
i = i + 2;
}
else
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 7;
++i;
}
break;
case 'A':
if (music[i + 1] == 'b')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 8;
i = i + 2;
}
else if (music[i + 1] == '#')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 10;
i = i + 2;
}
else
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 9;
++i;
}
break;
case 'B':
if (music[i + 1] == 'b')
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 10;
i = i + 2;
}
else
{
prevnotes[1] = prevnotes[0];
prevnotes[0] = 11;
++i;
}
break;
}
}
}
// Iterate through each note's probability vector and calculate the probability of a given note being chosen
for (int k = 0; k < 12; ++k)
{
for (int l = 0; l < 12; ++l)
{
ArrayList<Double> list = secondProb.get(k).get(l);
double x = 0.0;
double sum = 0.0;
for (Double y : list)
sum += y;
for (int m = 0; m < list.size(); ++m)
{
x = list.get(m);
if (sum != 0)
list.set(m, (x / sum));
}
}
}
}
public Paths getPath()
{
switch (key)
{
case 1:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/Rock", "*.mid");
case 2:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/GMajor", "*.mid");
case 3:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/DMajor", "*.mid");
case 4:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/AMajor", "*.mid");
case 5:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/EMajor", "*.mid");
case 6:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/BMajor", "*.mid");
case 7:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/F#Major", "*.mid");
case 8:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/DbMajor", "*.mid");
case 9:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/AbMajor", "*.mid");
case 10:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/EbMajor", "*.mid");
case 11:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/BbMajor", "*.mid");
case 12:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/FMajor", "*.mid");
default:
return new Paths("C:/EclipseWorkspace/L-SystemMusic/MIDIs/CMajor", "*.mid");
}
}
}