// Update pitch dynamically (while playing) async function updatePitchAndRestart() if (!currentBuffer) return; const newPitch = parseFloat(pitchSlider.value); currentPitch = newPitch; pitchReadout.innerText = newPitch.toFixed(2) + 'x'; if (isPlaying && currentBuffer) // seamless: stop current and restart with new rate // preserve playing state (better than glitch) await playWithPitch(newPitch); else if (currentBuffer && !isPlaying) // just update stored pitch, not playing
The Web Audio API provides a modular routing system: AudioContext , source nodes, AudioWorklet (or legacy ScriptProcessorNode ), and destination. For real-time processing, AudioWorklet is preferred due to its thread-safe, low-latency design.
sourceNode = audioContext.createBufferSource(); gainNode = audioContext.createGain(); gainNode.gain.value = 1.0; sourceNode.buffer = currentPitchedBuffer; sourceNode.connect(gainNode); gainNode.connect(audioContext.destination); sourceNode.start(0, offsetSeconds); startTime = audioContext.currentTime; pauseOffset = offsetSeconds; isPlaying = true; statusSpan.innerText = `🔊 Đang phát tai phan mem pitch shifter - html5
function resetStop() pauseOffset = 0; stopPlayback(true); isPlaying = false; statusSpan.innerText = `⏹ Dừng
// Create the Soundtouch Filter Node // We use the library's factory method to create a node compatible with Web Audio API soundtouchNode = new Soundtouch.SoundTouchNode(ctx); // Update pitch dynamically (while playing) async function
// Connect: source -> analyser -> gain -> destination newSource.connect(analyserNode); analyserNode.connect(gainNode); // note: gainNode already connected to destination
Microphone / File → MediaElementSource or MediaStreamSource → AudioWorkletNode (PitchShifterProcessor) → GainNode → Destination We need an input for the audio file,
This file structures the player. We need an input for the audio file, a slider for pitch control, and a play button.