Mem Pitch Shifter - Html5 | Tai Phan

.pitch-value background: #00000066; padding: 0.25rem 1rem; border-radius: 60px; font-family: 'JetBrains Mono', monospace; font-size: 1.2rem; font-weight: 700; color: #7ad0ff;

const result = createAndStartSource(startOffset); if (result) statusTextSpan.innerText = "Playing"; // ensure context running if (audioContext.state === 'suspended') audioContext.resume();

// Stop current playback and release source (without resetting buffer) function stopPlayback(resetOffset = true) if (sourceNode) try sourceNode.stop(); catch(e) /* already stopped */ sourceNode.disconnect(); sourceNode = null; isPlaying = false; if (resetOffset) pauseOffset = 0; updatePlayButtonsState(); tai phan mem pitch shifter - html5

// --- Audio context & nodes --- let audioContext = null; let sourceNode = null; // current active buffer source let audioBuffer = null; // decoded audio data let isPlaying = false; let currentPitchSemitones = 0; // value in semitones (-12..12) let startTime = 0; let pauseOffset = 0; // seconds where playback paused let isContextSuspended = false;

// Event binding pitchSlider.addEventListener('input', (e) => { const val = parseFloat(e.target.value); updatePitchUI(val); // If currently playing, dynamically update the playback rate on the fly if (sourceNode && isPlaying && audioContext && audioContext.state === 'running') { try sourceNode.playbackRate.value = semitonesToRate(currentPitchSemitones); catch(err) {} } }); .pitch-value background: #00000066

// 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); ); );

.btn-primary:active background: #1d4ed8; padding: 0.25rem 1rem

<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>