Html5 | Tai Phan Mem Pitch Shifter -

// 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); ); );

.knob-label display: flex; justify-content: space-between; font-weight: 600; color: #ccd6f0; margin-bottom: 0.5rem;

input[type="range"] width: 100%; height: 6px; -webkit-appearance: none; background: #2d3246; border-radius: 10px; outline: none; margin: 1rem 0; tai phan mem pitch shifter - html5

playBtn.addEventListener('click', () => audioContext.state === 'closed') initAudioContext(); if (audioContext && audioContext.state === 'suspended') audioContext.resume().then(() => if (isPlaying && sourceNode) return; playAudio(); ).catch(e => console.warn); else playAudio(); );

function patchedCreateAndStartSource(offsetSec) { if (!audioContext || !audioBuffer) return null; if (audioContext.state === 'suspended') audioContext.resume().then(() => patchedCreateAndStartSource(offsetSec)); return null; 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"; ; updatePlayButtonsState(); return newSource; } // semitone quick buttons document

.file-label background: #2d3a4b; cursor: pointer; text-align: center;

// Replace pause pauseAudio = patchedPauseAudio; const shiftVal = parseFloat(btn.getAttribute('data-shift'))

// update pause logic using new tracking function patchedPauseAudio() { if (!isPlaying || !sourceNode || !audioContext) return; if (sourceNode && audioContext && window._sourceStartTime !== null) 0) + effectiveElapsed; if (newOffset >= audioBuffer.duration) newOffset = audioBuffer.duration; pauseOffset = newOffset; if (sourceNode) { try sourceNode.stop(); catch(e) {} sourceNode.disconnect(); sourceNode = null; } isPlaying = false; window._sourceStartTime = null; updatePlayButtonsState(); statusTextSpan.innerText = "Paused"; }