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Pitch shifting in HTML5 generally follows two paths depending on whether you want to preserve the audio's duration:
if (sourceNode) { try sourceNode.stop(); catch(e) {} sourceNode.disconnect(); } const newSource = audioContext.createBufferSource(); newSource.buffer = audioBuffer; const rate = semitonesToRate(currentPitchSemitones); newSource.playbackRate.value = rate; newSource.connect(audioContext.destination); const startTime = audioContext.currentTime; newSource.start(startTime, offsetSec); sourceNode = newSource; window._sourceStartTime = startTime; isPlaying = true; newSource.onended = () => if (sourceNode === newSource) isPlaying = false; // if ended naturally, reset pauseOffset pauseOffset = 0; sourceNode = null; window._sourceStartTime = null; updatePlayButtonsState(); statusTextSpan.innerText = "Stopped";
statusTextSpan.innerText = "Ready — load audio"; })(); </script> </body> </html>
const result = createAndStartSource(startOffset); if (result) statusTextSpan.innerText = "Playing"; // ensure context running if (audioContext.state === 'suspended') audioContext.resume();
<div class="pitch-area"> <div class="knob-label"> <span>🔽 PITCH SHIFT</span> <span class="pitch-value" id="pitchDisplay">0.00 semitones</span> </div> <input type="range" id="pitchSlider" min="-12" max="12" step="0.1" value="0"> <div class="semitone-buttons"> <button class="st-btn" data-shift="-2">-2 sem</button> <button class="st-btn" data-shift="-1">-1 sem</button> <button class="st-btn reset" data-shift="0">⟳ Reset</button> <button class="st-btn" data-shift="1">+1 sem</button> <button class="st-btn" data-shift="2">+2 sem</button> <button class="st-btn" data-shift="5">+5 sem</button> <button class="st-btn" data-shift="-5">-5 sem</button> </div> <div style="font-size: 0.7rem; text-align: center; margin-top: 12px; color:#6b7280"> ⚡ Pitch factor: <span id="pitchFactorSpan">1.000</span> </div> </div>
// semitone quick buttons document.querySelectorAll('.st-btn').forEach(btn => btn.addEventListener('click', () => const shiftVal = parseFloat(btn.getAttribute('data-shift')); if (isNaN(shiftVal)) return; let newVal = currentPitchSemitones + shiftVal; if (newVal > 12) newVal = 12; if (newVal < -12) newVal = -12; updatePitchUI(newVal); if (sourceNode && isPlaying && audioContext && audioContext.state === 'running') sourceNode.playbackRate.value = semitonesToRate(currentPitchSemitones);
