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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Supplementary Material – MIDI Files Analysis</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tone/14.8.49/Tone.js"></script>
<script src="https://colxi.info/midi-parser-js/src/main.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.0/es5/tex-mml-chtml.js"></script>
<style>
body {
font-family: Arial, sans-serif;
max-width: 1200px;
margin: 0 auto;
padding: 40px;
line-height: 1.6;
}
h1, h2, h3, h4 {
text-align: center;
}
hr.gray-line {
border: 0;
height: 1px;
background-image: linear-gradient(to right, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.25), rgba(0, 0, 0, 0));
margin: 40px 0;
}
.tables-container {
display: flex;
justify-content: center;
align-items: flex-start;
gap: 20px;
flex-wrap: wrap;
margin-top: 20px;
}
.table-container {
flex: 1 1 45%;
max-width: 400px;
display: flex;
flex-direction: column;
align-items: center;
}
.table-container img {
width: 100%;
height: auto;
border: 1px solid #ccc;
}
h4 {
margin-top: 30px;
font-size: 1.2em;
color: #444;
}
.baselines-grid {
display: grid;
grid-template-columns: repeat(5, 1fr); /* Updated for 5 plots */
gap: 15px;
justify-items: center;
margin-top: 20px;
}
.results-grid {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 15px;
justify-items: center;
margin-top: 20px;
}
.our-model-container {
display: flex;
flex-direction: column;
align-items: center;
}
.our-model-plot {
margin-bottom: 10px;
}
.plot-container img {
width: 100%;
max-width: 200px;
height: auto;
border: 1px solid #ccc;
background: #f9f9f9;
padding: 4px;
}
.our-model-plot img {
width: 100%;
max-width: 350px;
height: auto;
border: 1px solid #ccc;
background: #f9f9f9;
padding: 4px;
}
/* Fixed MIDI grid centering */
.midi-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 20px;
justify-items: center;
width: 100%;
max-width: 900px;
margin: 20px auto; /* Changed from margin-top to margin with auto centering */
}
.midi-item {
width: 100%;
max-width: 300px;
text-align: center;
}
.piano-roll {
width: 100%;
height: 150px;
background: white;
border: 1px solid #ddd;
}
.midi-caption {
font-size: 14px;
color: #666;
line-height: 1.3;
flex-grow: 1;
text-align: left;
}
.btn {
background: none;
border: none;
cursor: pointer;
width: 40px;
height: 40px;
display: flex;
justify-content: center;
align-items: center;
padding: 0;
margin: 0;
}
.btn:hover {
opacity: 0.8;
}
.btn:disabled {
cursor: not-allowed;
opacity: 0.5;
}
.speaker-icon {
fill: rgb(48, 109, 161);
width: 24px;
height: 24px;
}
.baseline-labels {
display: grid;
grid-template-columns: repeat(5, 1fr); /* Updated for 5 labels */
text-align: center;
font-weight: bold;
margin-bottom: 10px;
font-size: 14px;
}
.caption-container {
display: flex;
justify-content: center;
align-items: center;
gap: 10px;
width: 100%;
max-width: 280px;
}
.caption {
text-align: center;
font-style: italic;
color: #555;
font-size: 14px;
}
.loading {
text-align: center;
color: #666;
padding: 20px;
}
.lc-diff-plot-container {
display: flex;
flex-direction: column;
align-items: center;
gap: 8px;
}
/* Additional centering for the subsection containing MIDI examples */
.subsection:has(#contourMidiGrid) {
display: flex;
flex-direction: column;
align-items: center;
}
@media (max-width: 768px) {
.baselines-grid {
grid-template-columns: repeat(2, 1fr);
}
.midi-grid {
grid-template-columns: 1fr;
}
.tables-container {
flex-direction: column;
align-items: center;
}
.table-container {
flex: 1 1 90%;
}
.baseline-labels {
grid-template-columns: repeat(2, 1fr);
}
}
</style>
</head>
<body>
<h1>Supplementary Material</h1>
<p>This page contains the analysis for the paper <strong>M. Pettenò, A. I. Mezza, and A. Bernardini,
"Conditional Diffusion As Latent Constraints for Controllable Symbolic Music Generation", in Proc. of
the 26th International Society for Music Information Retrieval Conference (ISMIR 2025), Daejeon, Korea,
Sept. 21-25, 2025</strong>.<br/>
<br/>
The code of the paper is available <a href="https://github.com/mpetteno/controllable-latent-diffusion">here</a>.
All the MIDI examples in this page are generated by our model LC-Diff.</p>
<hr class="gray-line">
<div class="results-section">
<h2>Results</h2>
<div class="tables-container">
<div class="table-container">
<img src="assets/tables/pearson.png" alt="Pearson coefficient table">
</div>
<div class="table-container">
<img src="assets/tables/fmd.png" alt="Frechet Music Distance table">
</div>
</div>
</div>
<hr class="gray-line">
<div class="attribute-section">
<h2>Contour</h2>
<div class="subsection">
<h3>Regression Plots</h3>
<div class="baseline-labels">
<div>NM</div>
<div>P&L</div>
<div>LC-VAE-A</div>
<div>LC-VAE-SE</div>
<div>LC-Diff (Ours)</div>
</div>
<div class="baselines-grid">
<div class="plot-container">
<img src="assets/attributes/contour/plots/naive-ar-vae_labels_vs_attribute.png" alt="Contour Baseline NM">
</div>
<div class="plot-container">
<img src="assets/attributes/contour/plots/sign-ar-vae_labels_vs_attribute.png" alt="Contour Baseline P&L">
</div>
<div class="plot-container">
<img src="assets/attributes/contour/plots/lc-vae-a_labels_vs_attribute.png" alt="Contour Baseline LC-VAE-A">
</div>
<div class="plot-container">
<img src="assets/attributes/contour/plots/lc-vae-se_labels_vs_attribute.png" alt="Contour Baseline LC-VAE-SE">
</div>
<div class="plot-container">
<img src="assets/attributes/contour/plots/lc-diff_labels_vs_attribute.png" alt="Contour LC-Diff">
</div>
</div>
<p class="caption">Regression plots comparing target and decoded Contour attributes across baseline methods and LC-Diff (ours).</p>
</div>
<div class="subsection">
<h4>MIDI Examples</h4>
<div class="midi-grid" id="contourMidiGrid">
<div class="loading">Loading MIDI files...</div>
</div>
</div>
</div>
<hr class="gray-line">
<div class="attribute-section">
<h2>Rhythm Complexity</h2>
<div class="subsection">
<h3>Regression Plots</h3>
<div class="baseline-labels">
<div>NM</div>
<div>P&L</div>
<div>LC-VAE-A</div>
<div>LC-VAE-SE</div>
<div>LC-Diff (Ours)</div>
</div>
<div class="baselines-grid">
<div class="plot-container">
<img src="assets/attributes/toussaint/plots/naive-ar-vae_labels_vs_attribute.png" alt="Contour Baseline NM">
</div>
<div class="plot-container">
<img src="assets/attributes/toussaint/plots/sign-ar-vae_labels_vs_attribute.png" alt="Contour Baseline P&L">
</div>
<div class="plot-container">
<img src="assets/attributes/toussaint/plots/lc-vae-a_labels_vs_attribute.png" alt="Contour Baseline LC-VAE-A">
</div>
<div class="plot-container">
<img src="assets/attributes/toussaint/plots/lc-vae-se_labels_vs_attribute.png" alt="Contour Baseline LC-VAE-SE">
</div>
<div class="plot-container">
<img src="assets/attributes/toussaint/plots/lc-diff_labels_vs_attribute.png" alt="Contour LC-Diff">
</div>
</div>
<p class="caption">Regression plots comparing target and decoded Rhythm Complexity attributes across baseline methods and LC-Diff (ours).</p>
</div>
<div class="subsection">
<h4>MIDI Examples</h4>
<div class="midi-grid" id="rhythmMidiGrid">
<div class="loading">Loading MIDI files...</div>
</div>
</div>
</div>
<hr class="gray-line">
<div class="attribute-section">
<h2>Note Density</h2>
<div class="subsection">
<h3>Regression Plots</h3>
<div class="baseline-labels">
<div>NM</div>
<div>P&L</div>
<div>LC-VAE-A</div>
<div>LC-VAE-SE</div>
<div>LC-Diff (Ours)</div>
</div>
<div class="baselines-grid">
<div class="plot-container">
<img src="assets/attributes/note-density/plots/naive-ar-vae_labels_vs_attribute.png" alt="Contour Baseline NM">
</div>
<div class="plot-container">
<img src="assets/attributes/note-density/plots/sign-ar-vae_labels_vs_attribute.png" alt="Contour Baseline P&L">
</div>
<div class="plot-container">
<img src="assets/attributes/note-density/plots/lc-vae-a_labels_vs_attribute.png" alt="Contour Baseline LC-VAE-A">
</div>
<div class="plot-container">
<img src="assets/attributes/note-density/plots/lc-vae-se_labels_vs_attribute.png" alt="Contour Baseline LC-VAE-SE">
</div>
<div class="plot-container">
<img src="assets/attributes/note-density/plots/lc-diff_labels_vs_attribute.png" alt="Contour LC-Diff">
</div>
</div>
<p class="caption">Regression plots comparing target and decoded Note Density attributes across baseline methods and LC-Diff (ours).</p>
</div>
<div class="subsection">
<h4>MIDI Examples</h4>
<div class="midi-grid" id="noteDensityMidiGrid">
<div class="loading">Loading MIDI files...</div>
</div>
</div>
</div>
<hr class="gray-line">
<div class="attribute-section">
<h2>Pitch Range</h2>
<div class="subsection">
<h3>Regression Plots</h3>
<div class="baseline-labels">
<div>NM</div>
<div>P&L</div>
<div>LC-VAE-A</div>
<div>LC-VAE-SE</div>
<div>LC-Diff (Ours)</div>
</div>
<div class="baselines-grid">
<div class="plot-container">
<img src="assets/attributes/pitch-range/plots/naive-ar-vae_labels_vs_attribute.png" alt="Contour Baseline NM">
</div>
<div class="plot-container">
<img src="assets/attributes/pitch-range/plots/sign-ar-vae_labels_vs_attribute.png" alt="Contour Baseline P&L">
</div>
<div class="plot-container">
<img src="assets/attributes/pitch-range/plots/lc-vae-a_labels_vs_attribute.png" alt="Contour Baseline LC-VAE-A">
</div>
<div class="plot-container">
<img src="assets/attributes/pitch-range/plots/lc-vae-se_labels_vs_attribute.png" alt="Contour Baseline LC-VAE-SE">
</div>
<div class="plot-container">
<img src="assets/attributes/pitch-range/plots/lc-diff_labels_vs_attribute.png" alt="Contour LC-Diff">
</div>
</div>
<p class="caption">Regression plots comparing target and decoded Pitch Range attributes across baseline methods and LC-Diff (ours).</p>
</div>
<div class="subsection">
<h4>MIDI Examples</h4>
<div class="midi-grid" id="pitchRangeMidiGrid">
<div class="loading">Loading MIDI files...</div>
</div>
</div>
</div>
<script>
// Configuration - Updated with correct file paths
const CONFIG = {
midi: {
rhythm_complexity: {
path: 'assets/attributes/toussaint/midi/',
files: [
'gen_toussaint_cond_0.000000_seq_0.000000_18949.midi',
'gen_toussaint_cond_15.000000_seq_15.000000_654.midi',
'gen_toussaint_cond_32.000000_seq_32.000000_7369.midi',
'gen_toussaint_cond_0.000000_seq_0.000000_19329.midi',
'gen_toussaint_cond_15.000000_seq_15.000000_2345.midi',
'gen_toussaint_cond_32.000000_seq_32.000000_7667.midi',
'gen_toussaint_cond_0.000000_seq_0.000000_19388.midi',
'gen_toussaint_cond_15.000000_seq_15.000000_2954.midi',
'gen_toussaint_cond_32.000000_seq_32.000000_8548.midi'
]
},
contour: {
path: 'assets/attributes/contour/midi/',
files: [
'gen_contour_cond_1.704550_seq_1.681818_2475.midi',
'gen_contour_cond_2.772730_seq_2.579545_2859.midi',
'gen_contour_cond_3.954550_seq_3.852273_19943.midi',
'gen_contour_cond_1.704550_seq_1.704545_1989.midi',
'gen_contour_cond_2.772730_seq_2.659091_2193.midi',
'gen_contour_cond_3.954550_seq_3.988636_16330.midi',
'gen_contour_cond_1.704550_seq_1.795455_10954.midi',
'gen_contour_cond_2.772730_seq_2.818182_11965.midi',
'gen_contour_cond_3.954550_seq_4.056818_5819.midi'
]
},
pitch_range: {
path: 'assets/attributes/pitch-range/midi/',
files: [
'gen_pitch_range_cond_0.011360_seq_0.011364_14447.midi',
'gen_pitch_range_cond_0.272730_seq_0.261364_11811.midi',
'gen_pitch_range_cond_0.681820_seq_0.647727_7433.midi',
'gen_pitch_range_cond_0.011360_seq_0.022727_20268.midi',
'gen_pitch_range_cond_0.272730_seq_0.272727_3036.midi',
'gen_pitch_range_cond_0.681820_seq_0.681818_3844.midi',
'gen_pitch_range_cond_0.011360_seq_0.034091_14770.midi',
'gen_pitch_range_cond_0.272730_seq_0.284091_6938.midi',
'gen_pitch_range_cond_0.681820_seq_0.738636_10410.midi'
]
},
note_density: {
path: 'assets/attributes/note-density/midi/',
files: [
'gen_note_density_cond_0.171880_seq_0.171875_5461.midi',
'gen_note_density_cond_0.468750_seq_0.437500_21853.midi',
'gen_note_density_cond_0.953120_seq_0.937500_20675.midi',
'gen_note_density_cond_0.171880_seq_0.171875_7136.midi',
'gen_note_density_cond_0.468750_seq_0.453125_526.midi',
'gen_note_density_cond_0.953120_seq_0.953125_18502.midi',
'gen_note_density_cond_0.171880_seq_0.187500_19849.midi',
'gen_note_density_cond_0.468750_seq_0.468750_5620.midi',
'gen_note_density_cond_0.953120_seq_0.968750_17116.midi'
]
}
}
};
// MathJax setup
MathJax.typesetPromise();
// Audio setup
let synth;
let reverb;
let delay;
let currentlyPlaying = null;
async function initAudio() {
if (!synth) {
await Tone.start();
Tone.Transport.bpm.value = 120;
Tone.Transport.bpm.units = "bpm";
reverb = new Tone.Reverb({
decay: 1.5,
wet: 0.4
}).toDestination();
delay = new Tone.FeedbackDelay({
delayTime: "8n",
feedback: 0.3,
wet: 0.1
}).connect(reverb);
synth = new Tone.PolySynth(Tone.Synth).connect(delay);
}
}
// Helper: Convert ArrayBuffer -> Base64 string
function arrayBufferToBase64(buffer) {
return new Promise((resolve, reject) => {
const blob = new Blob([buffer]);
const reader = new FileReader();
reader.onload = () => {
const base64 = reader.result.split(",")[1];
resolve(base64);
};
reader.onerror = reject;
reader.readAsDataURL(blob);
});
}
async function parseMIDI(arrayBuffer) {
let base64 = await arrayBufferToBase64(arrayBuffer);
return MidiParser.parse(base64);
}
function drawPianoRoll(canvas, midiData, notes, options = {}) {
const ctx = canvas.getContext('2d');
const width = canvas.width;
const height = canvas.height;
ctx.fillStyle = '#fafafa';
ctx.fillRect(0, 0, width, height);
if (!notes || notes.length === 0) return;
const allNotes = notes.map(n => n.note);
const minNote = Math.min(...allNotes);
const maxNote = Math.max(...allNotes);
const maxTime = Math.max(...notes.map(n => n.end));
const noteRange = Math.max(maxNote - minNote, 12);
const timeScale = width / maxTime;
const noteScale = height / (noteRange + 1);
ctx.strokeStyle = '#e0e0e0';
ctx.lineWidth = 1;
for (let i = 0; i <= 16; i++) {
const x = (width / 16) * i;
ctx.beginPath();
ctx.moveTo(x, 0);
ctx.lineTo(x, height);
ctx.stroke();
}
for (let i = 0; i <= noteRange; i++) {
const y = height - (i * noteScale);
ctx.beginPath();
ctx.moveTo(0, y);
ctx.lineTo(width, y);
ctx.stroke();
}
notes.forEach(note => {
const x = note.start * timeScale;
const y = height - ((note.note - minNote + 1) * noteScale);
const w = Math.max(note.duration * timeScale, 2);
const h = noteScale * 0.8;
const hue = 320 - (note.velocity / 127) * 40;
ctx.fillStyle = `hsl(${hue}, 70%, 50%)`;
ctx.fillRect(x, y, w, h);
ctx.strokeStyle = '#333';
ctx.strokeRect(x, y, w, h);
});
if (options.playhead !== undefined) {
const playheadX = options.playhead * timeScale;
ctx.strokeStyle = 'rgb(48, 109, 161)';
ctx.lineWidth = 2;
ctx.beginPath();
ctx.moveTo(playheadX, 0);
ctx.lineTo(playheadX, height);
ctx.stroke();
}
}
async function playMIDI(midiData, button, canvas) {
const playIcon = `<svg class="speaker-icon" viewBox="0 0 24 24"><path d="M14 3.23V5.29C16.89 6.15 19 8.83 19 12C19 15.17 16.89 17.85 14 18.71V20.77C18 19.86 21 16.29 21 12S18 4.14 14 3.23M16.5 12C16.5 10.23 15.65 8.71 14.5 7.91V16.09C15.65 15.29 16.5 13.77 16.5 12M3 9V15H7L12 20V4L7 9H3Z"></path></svg>`;
const stopIcon = `<svg class="speaker-icon" viewBox="0 0 24 24"><path d="M3 9H7L12 4V20L7 15H3V9M16 9H21V15H16V9Z" /></svg>`;
if (currentlyPlaying) {
Tone.Transport.stop();
Tone.Transport.cancel();
currentlyPlaying.innerHTML = playIcon;
currentlyPlaying.disabled = false;
currentlyPlaying = null;
return;
}
await initAudio();
button.innerHTML = stopIcon;
currentlyPlaying = button;
const notes = [];
let maxTime = 0;
midiData.track.forEach(track => {
let currentTime = 0;
const activeNotes = new Map();
track.event.forEach(event => {
currentTime += (event.deltaTime || 0) / (midiData.timeDivision * 2);
if (event.type === 9) {
const noteNumber = event.data[0];
const velocity = event.data[1];
if (velocity > 0) {
activeNotes.set(noteNumber, {
note: noteNumber,
start: currentTime,
velocity: velocity
});
} else {
const noteInfo = activeNotes.get(noteNumber);
if (noteInfo) {
const duration = currentTime - noteInfo.start;
notes.push({
start: noteInfo.start,
end: currentTime,
duration: Math.max(duration, 0.05),
note: noteInfo.note,
velocity: noteInfo.velocity
});
activeNotes.delete(noteNumber);
maxTime = Math.max(maxTime, currentTime);
}
}
}
});
});
notes.forEach(note => {
Tone.Transport.schedule(time => {
synth.triggerAttackRelease(
Tone.Frequency(note.note, "midi").toFrequency(),
note.duration,
time,
note.velocity / 127
);
}, note.start);
});
Tone.Transport.scheduleRepeat(time => {
const position = Tone.Transport.seconds;
drawPianoRoll(canvas, midiData, notes, {
playhead: position
});
}, "16n");
Tone.Transport.start();
setTimeout(() => {
if (currentlyPlaying === button) {
Tone.Transport.stop();
Tone.Transport.cancel();
button.innerHTML = playIcon;
button.disabled = false;
currentlyPlaying = null;
drawPianoRoll(canvas, midiData, notes);
}
}, (maxTime + 1) * 1000);
}
function parseFilename(filename) {
const pattern = /_cond_([+-]?\d*\.?\d+)_seq_([+-]?\d*\.?\d+)_\d+\.midi/;
const match = filename.match(pattern);
if (match) {
return {
value1: parseFloat(match[1]),
value2: parseFloat(match[2])
};
}
return null;
}
async function loadMIDIFile(path, filename) {
try {
const response = await fetch(path + filename);
if (!response.ok) throw new Error(`HTTP ${response.status}`);
const arrayBuffer = await response.arrayBuffer();
return await parseMIDI(arrayBuffer);
} catch (error) {
console.error(`Error loading MIDI file ${filename}:`, error);
return null;
}
}
function createMidiItem(filename, midiData) {
const item = document.createElement('div');
item.className = 'midi-item';
const values = parseFilename(filename);
const canvas = document.createElement('canvas');
canvas.className = 'piano-roll';
canvas.width = 300;
canvas.height = 150;
const playButton = document.createElement('button');
playButton.className = 'btn';
playButton.innerHTML = `<svg class="speaker-icon" viewBox="0 0 24 24"><path d="M14 3.23V5.29C16.89 6.15 19 8.83 19 12C19 15.17 16.89 17.85 14 18.71V20.77C18 19.86 21 16.29 21 12S18 4.14 14 3.23M16.5 12C16.5 10.23 15.65 8.71 14.5 7.91V16.09C15.65 15.29 16.5 13.77 16.5 12M3 9V15H7L12 20V4L7 9H3Z"></path></svg>`;
const captionContainer = document.createElement('div');
captionContainer.className = 'caption-container';
const caption = document.createElement('div');
caption.className = 'midi-caption';
if (values) {
caption.innerHTML = `$$a = ${values.value1.toFixed(3)} \\rightarrow a_g = ${values.value2.toFixed(3)}$$`;
} else {
caption.innerHTML = 'Unable to parse values';
}
MathJax.typesetPromise([caption]);
captionContainer.appendChild(playButton);
captionContainer.appendChild(caption);
item.appendChild(canvas);
item.appendChild(captionContainer);
if (midiData && midiData.track) {
const notes = [];
midiData.track.forEach(track => {
let currentTime = 0;
const activeNotes = new Map();
track.event.forEach(event => {
currentTime += (event.deltaTime || 0) / midiData.timeDivision;
if (event.type === 9) {
const noteNumber = event.data[0];
const velocity = event.data[1];
if (velocity > 0) {
activeNotes.set(noteNumber, {
note: noteNumber,
start: currentTime,
velocity: velocity
});
} else {
const noteInfo = activeNotes.get(noteNumber);
if (noteInfo) {
const duration = currentTime - noteInfo.start;
notes.push({
start: noteInfo.start,
end: currentTime,
duration: Math.max(duration, 0.05),
note: noteInfo.note,
velocity: noteInfo.velocity
});
activeNotes.delete(noteNumber);
}
}
}
});
});
drawPianoRoll(canvas, midiData, notes);
playButton.addEventListener('click', () => {
playMIDI(midiData, playButton, canvas);
});
} else {
const ctx = canvas.getContext('2d');
ctx.fillStyle = '#ff6b6b';
ctx.font = '12px Arial';
ctx.textAlign = 'center';
ctx.fillText('Error loading MIDI', canvas.width / 2, canvas.height / 2);
playButton.disabled = true;
}
return item;
}
async function loadMIDIFiles() {
const grids = {
rhythm_complexity: document.getElementById('rhythmMidiGrid'),
contour: document.getElementById('contourMidiGrid'),
pitch_range: document.getElementById('pitchRangeMidiGrid'),
note_density: document.getElementById('noteDensityMidiGrid')
};
for (const [attribute, grid] of Object.entries(grids)) {
if (!grid) continue;
grid.innerHTML = '';
const attributeConfig = CONFIG.midi[attribute];
if (!attributeConfig || !attributeConfig.files || attributeConfig.files.length === 0) {
grid.innerHTML = '<div class="loading">No files configured</div>';
continue;
}
for (const filename of attributeConfig.files.slice(0, 9)) {
const midiData = await loadMIDIFile(attributeConfig.path, filename);
const midiItem = createMidiItem(filename, midiData);
grid.appendChild(midiItem);
}
}
}
document.addEventListener('DOMContentLoaded', loadMIDIFiles);
</script>
</body>
</html>