Midi Clef Karaoke Player Apr 2026

playMIDINotes() let currentIndex = 0; const scheduleNotes = () => if (!this.isPlaying) return; const now = (performance.now() - this.startTime) / 1000; while (currentIndex < this.notes.length && this.notes[currentIndex].startTime <= now + 0.1) const note = this.notes[currentIndex]; const midiNote = note.pitch; const velocity = note.velocity / 127; const duration = note.duration; MIDI.noteOn(0, midiNote, velocity, 0); MIDI.noteOff(0, midiNote, duration); currentIndex++; requestAnimationFrame(scheduleNotes); ; scheduleNotes();

button:active transform: translateY(0);

play() if (!this.midiData

parseMIDIData() this.notes = []; this.lyrics = []; this.midiData.tracks.forEach((track, trackIndex) => let currentTime = 0; let currentLyric = ''; track.forEach(event => ); ); // Sort notes by start time this.notes.sort((a, b) => a.startTime - b.startTime); this.lyrics.sort((a, b) => a.time - b.time); console.log(`Loaded $this.notes.length notes, $this.lyrics.length lyrics`);

canvas display: block; margin: 0 auto; background: #fff9e8; border-radius: 10px; cursor: pointer; midi clef karaoke player

.controls display: flex; gap: 15px; margin-bottom: 20px; flex-wrap: wrap; justify-content: center;

<script src="https://cdn.jsdelivr.net/npm/midijs@0.2.1/build/MIDI.js"></script> <script src="https://cdn.socket.io/4.5.0/socket.io.min.js"></script> <script> // Main implementation class MIDIClefKaraokePlayer constructor() this.midiData = null; this.audioContext = null; this.isPlaying = false; this.startTime = 0; this.currentPauseTime = 0; this.notes = []; this.lyrics = []; this.clef = 'treble'; // treble or bass this.canvas = document.getElementById('staffCanvas'); this.ctx = this.canvas.getContext('2d'); this.animationId = null; this.scrollOffset = 0; playMIDINotes() let currentIndex = 0; const scheduleNotes =

stop() this.pause(); this.currentPauseTime = 0; this.startTime = 0; this.drawStaff(); document.getElementById('lyricsDisplay').innerHTML = '⏹ Stopped';

.info color: white; text-align: center; margin-top: 15px; font-size: 14px; playMIDINotes() let currentIndex = 0

button:hover background: #ff6b6b; transform: translateY(-2px); box-shadow: 0 6px 12px rgba(0,0,0,0.3);

midiToStaffY(midiNote) // Middle C (MIDI 60) position depends on clef const staffTop = 50; const lineSpacing = 25; let linesFromC; if (this.clef === 'treble') // In treble clef, middle C is below the staff (1 ledger line) // E4 (MIDI 64) is bottom line linesFromC = midiNote - 60; // each step = half line const y = staffTop + (4 * lineSpacing) - (linesFromC * lineSpacing / 2); return y; else // Bass clef: middle C is above staff // C3 (MIDI 48) is top line? Let's adjust const bassRef = 48; // C3 linesFromC = midiNote - bassRef; const y = staffTop + (1 * lineSpacing) - (linesFromC * lineSpacing / 2); return y;