Đối với nội dung về "tai phan mem pitch shifter - html5", có hai hướng chính tùy thuộc vào việc bạn là người dùng muốn thay đổi cao độ âm thanh trực tiếp trên web hay là lập trình viên muốn xây dựng tính năng này.
1. Dành cho người dùng: Các tiện ích mở rộng (Extensions)
Nếu bạn muốn thay đổi cao độ (pitch) của video hoặc âm thanh trên các trang web như YouTube mà không làm thay đổi tốc độ phát, bạn có thể cài đặt các tiện ích trình duyệt:
Pitch Shifter HTML5 Video Audio FX: Một tiện ích phổ biến cho phép thay đổi cao độ của các nguồn video HTML5 trực tiếp trên trang. Bạn có thể tải về thông qua các kho tiện ích như Softonic. tai phan mem pitch shifter - html5
Transpose: Một công cụ mạnh mẽ hơn có sẵn trên Chrome Web Store, hỗ trợ thay đổi tông nhạc (semitones), tốc độ và tạo vòng lặp cho nhạc trên YouTube, Spotify.
Pitch Shifter X: Tiện ích miễn phí giúp điều chỉnh cao độ với độ chính xác theo từng nửa cung (semitone) mà vẫn giữ nguyên chất lượng âm thanh.
2. Dành cho lập trình viên: Thư viện & Mã nguồn (Github) Click "Choose File" and select an MP3 or WAV file
HTML5 cung cấp Web Audio API, cho phép xử lý âm thanh thời gian thực ngay trên trình duyệt. Dưới đây là các tài nguyên hữu ích: Pitch shifter HTML5 Video audio FX in Chrome with OffiDocs
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
<title>Real-Time Pitch Shifter | HTML5 Audio Processor</title>
<style>
*
box-sizing: border-box;
user-select: none; /* better UX for sliders, but text still selectable if needed */
body
background: linear-gradient(145deg, #121212 0%, #1e1e2f 100%);
font-family: 'Segoe UI', 'Inter', system-ui, -apple-system, 'Roboto', monospace;
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
margin: 0;
padding: 20px;
.shifter-card
max-width: 580px;
width: 100%;
background: rgba(28, 28, 38, 0.85);
backdrop-filter: blur(2px);
border-radius: 48px;
box-shadow: 0 25px 45px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
padding: 28px 24px 36px;
transition: all 0.2s ease;
h1
font-size: 1.9rem;
font-weight: 700;
margin: 0 0 6px 0;
letter-spacing: -0.5px;
background: linear-gradient(135deg, #E9F0FF, #B9E0FF);
-webkit-background-clip: text;
background-clip: text;
color: transparent;
text-shadow: 0 2px 3px rgba(0,0,0,0.1);
display: flex;
align-items: center;
gap: 10px;
.sub
font-size: 0.85rem;
color: #9aa4bf;
margin-bottom: 28px;
border-left: 3px solid #3b82f6;
padding-left: 12px;
font-weight: 400;
.visualizer-container
background: #0a0a12;
border-radius: 32px;
padding: 12px;
margin-bottom: 28px;
box-shadow: inset 0 2px 5px #00000030, 0 5px 12px rgba(0,0,0,0.2);
canvas
display: block;
width: 100%;
height: 130px;
background: #030307;
border-radius: 24px;
margin: 0 auto;
.control-panel
background: #1e1e28c9;
border-radius: 40px;
padding: 16px 20px;
margin-bottom: 28px;
.pitch-slider-area
display: flex;
flex-direction: column;
gap: 12px;
.label-row
display: flex;
justify-content: space-between;
font-weight: 600;
color: #cfdbf5;
letter-spacing: 0.3px;
.pitch-value
background: #00000066;
padding: 4px 14px;
border-radius: 60px;
font-family: 'JetBrains Mono', monospace;
font-size: 1.2rem;
font-weight: 600;
color: #facc15;
input[type="range"]
-webkit-appearance: none;
width: 100%;
height: 6px;
background: linear-gradient(90deg, #2ecc71, #f1c40f, #e67e22, #e74c3c);
border-radius: 10px;
outline: none;
cursor: pointer;
input[type="range"]:focus
outline: none;
input[type="range"]::-webkit-slider-thumb
-webkit-appearance: none;
width: 22px;
height: 22px;
background: white;
border-radius: 50%;
box-shadow: 0 2px 12px cyan;
border: 2px solid #2c3e66;
cursor: pointer;
transition: 0.1s;
input[type="range"]::-webkit-slider-thumb:hover
transform: scale(1.2);
background: #f5f9ff;
.semitone-buttons
display: flex;
gap: 12px;
justify-content: space-between;
margin-top: 16px;
flex-wrap: wrap;
.st-btn
background: #2a2a36;
border: none;
padding: 8px 16px;
border-radius: 60px;
font-weight: bold;
font-size: 0.9rem;
color: #ccd6f0;
cursor: pointer;
transition: all 0.15s;
flex: 1;
text-align: center;
box-shadow: 0 1px 3px black;
.st-btn:active
transform: scale(0.96);
.st-btn.reset-btn
background: #3b425b;
color: white;
.action-buttons
display: flex;
gap: 18px;
margin-top: 24px;
.primary-btn
flex: 1;
background: #2563eb;
border: none;
padding: 12px 0;
border-radius: 60px;
font-weight: 700;
font-size: 1rem;
color: white;
cursor: pointer;
transition: 0.2s;
box-shadow: 0 4px 8px rgba(0,0,0,0.3);
display: flex;
align-items: center;
justify-content: center;
gap: 8px;
.danger-btn
background: #dc2626;
.primary-btn:active
transform: scale(0.97);
.file-info
margin-top: 22px;
font-size: 0.75rem;
text-align: center;
color: #7c85a2;
background: #0e0e16;
padding: 12px;
border-radius: 40px;
word-break: break-word;
.status-badge
display: inline-block;
background: #10b98133;
padding: 4px 12px;
border-radius: 40px;
font-size: 0.7rem;
font-weight: 500;
color: #b9f5d8;
footer
font-size: 0.65rem;
text-align: center;
margin-top: 24px;
color: #5e6788;
@media (max-width: 480px)
.shifter-card
padding: 20px 16px;
.st-btn
font-size: 0.75rem;
padding: 6px 8px;
</style>
</head>
<body>
<div class="shifter-card">
<h1>
🎛️ Pitch Shifter
<span style="font-size: 0.9rem;">⍟ realtime</span>
</h1>
<div class="sub">HTML5 Web Audio · granular pitch shift · live spectrum</div>
<div class="visualizer-container">
<canvas id="waveCanvas" width="800" height="130" style="width:100%; height:130px"></canvas>
</div>
<div class="control-panel">
<div class="pitch-slider-area">
<div class="label-row">
<span>🎚️ Pitch shift factor</span>
<span class="pitch-value" id="pitchReadout">1.00x</span>
</div>
<input type="range" id="pitchSlider" min="0.5" max="2.0" step="0.01" value="1.0">
<div class="semitone-buttons">
<button class="st-btn" data-semitone="-12">-12 semitones ⬇️</button>
<button class="st-btn" data-semitone="-7">-7</button>
<button class="st-btn" data-semitone="-2">-2</button>
<button class="st-btn reset-btn" data-semitone="0">⟳ reset</button>
<button class="st-btn" data-semitone="2">+2</button>
<button class="st-btn" data-semitone="7">+7</button>
<button class="st-btn" data-semitone="12">+12 ⬆️</button>
</div>
</div>
</div>
<div class="action-buttons">
<button class="primary-btn" id="loadFileBtn">📂 Load Audio File</button>
<button class="primary-btn danger-btn" id="stopBtn">⏹️ Stop</button>
</div>
<input type="file" id="fileInput" accept="audio/*" style="display: none;" />
<div class="file-info" id="infoBox">
<span class="status-badge" id="playStatus">⚫ idle</span>
<span id="fileNameDisplay"> No track loaded — pick an MP3, WAV, OGG</span>
</div>
<footer>⚡ Real-time pitch shifting using playbackRate + resampling technique<br>🎧 Works best with melodic content | Web Audio API</footer>
</div>
<script>
(function(){
// ---------- DOM elements ----------
const canvas = document.getElementById('waveCanvas');
const ctx = canvas.getContext('2d');
const pitchSlider = document.getElementById('pitchSlider');
const pitchReadout = document.getElementById('pitchReadout');
const loadBtn = document.getElementById('loadFileBtn');
const stopBtn = document.getElementById('stopBtn');
const fileInput = document.getElementById('fileInput');
const fileNameSpan = document.getElementById('fileNameDisplay');
const playStatusSpan = document.getElementById('playStatus');
// ---------- Audio context & nodes ----------
let audioCtx = null;
let sourceNode = null; // current buffer source
let gainNode = null; // optional gain / master
let isPlaying = false;
let currentBuffer = null; // stored audio buffer
let currentPitch = 1.0; // current pitch factor
// For analyser & visualizer
let analyserNode = null;
let animationId = null;
let mediaStreamDestination = null;
// ---------- Helper: format file name ----------
function updateFileNameDisplay(file)
if(file)
let name = file.name.length > 45 ? file.name.substring(0,42)+'...' : file.name;
fileNameSpan.innerText = ` 🎵 $name`;
else
fileNameSpan.innerText = ' No track loaded — pick an MP3, WAV, OGG';
// ---------- Stop playback and clean source ----------
function stopPlayback(resetStatusText = true)
if (sourceNode)
try
sourceNode.stop();
catch(e) /* ignore if already stopped */
sourceNode.disconnect();
sourceNode = null;
isPlaying = false;
if (resetStatusText)
playStatusSpan.innerText = '⏹️ stopped';
playStatusSpan.style.background = "#3b425b33";
if (animationId)
cancelAnimationFrame(animationId);
animationId = null;
// Clear canvas after stop (draw flatline)
drawFlatline();
// draw flat / empty visual
function drawFlatline()
if (!ctx) return;
const w = canvas.width, h = canvas.height;
ctx.clearRect(0, 0, w, h);
ctx.fillStyle = "#030307";
ctx.fillRect(0, 0, w, h);
ctx.beginPath();
ctx.strokeStyle = "#4f5b93";
ctx.lineWidth = 2;
const mid = h / 2;
ctx.moveTo(0, mid);
ctx.lineTo(w, mid);
ctx.stroke();
ctx.fillStyle = "#4b5e9b80";
ctx.font = "11px monospace";
ctx.fillText("⚡ waiting for audio", w/2-70, mid-8);
// start visualization from analyser
function startVisualization()
if (animationId) cancelAnimationFrame(animationId);
if (!analyserNode) return;
const bufferLength = analyserNode.frequencyBinCount;
const dataArray = new Uint8Array(bufferLength);
const width = canvas.width;
const height = canvas.height;
function draw()
if (!analyserNode)
drawFlatline();
return;
animationId = requestAnimationFrame(draw);
analyserNode.getByteTimeDomainData(dataArray); // waveform
ctx.clearRect(0, 0, width, height);
ctx.fillStyle = "#030307";
ctx.fillRect(0, 0, width, height);
ctx.beginPath();
ctx.strokeStyle = "#64ffda";
ctx.lineWidth = 2.5;
ctx.shadowBlur = 0;
const sliceWidth = width / bufferLength;
let x = 0;
for (let i = 0; i < bufferLength; i++)
const v = dataArray[i] / 128.0;
const y = v * (height / 2);
if (i === 0) ctx.moveTo(x, y);
else ctx.lineTo(x, y);
x += sliceWidth;
ctx.lineTo(width, height/2);
ctx.stroke();
// add subtle gradient glow
ctx.beginPath();
ctx.strokeStyle = "#34d39980";
ctx.lineWidth = 1;
for (let i = 0; i < bufferLength; i+=8)
const v = dataArray[i] / 128.0;
const y = v * (height / 2);
ctx.fillStyle = "#6ee7b766";
ctx.fillRect(i*sliceWidth, y-1, 1.5, 2);
draw();
// Create audio context and nodes (resume if suspended)
async function setupAudioContext()
if (!audioCtx)
if (audioCtx.state === 'suspended')
await audioCtx.resume();
return audioCtx;
// Core: play currentBuffer with given pitch factor (playbackRate)
async function playWithPitch(pitchValue) {
if (!currentBuffer)
playStatusSpan.innerText = '⚠️ no audio loaded';
return false;
await setupAudioContext();
// stop previous source without resetting entire context state
if (sourceNode) {
try sourceNode.stop(); catch(e) {}
sourceNode.disconnect();
sourceNode = null;
}
// Create new buffer source
const newSource = audioCtx.createBufferSource();
newSource.buffer = currentBuffer;
newSource.playbackRate.value = pitchValue; // PITCH SHIFT core mechanism (resampling)
// Connect: source -> analyser -> gain -> destination
newSource.connect(analyserNode);
analyserNode.connect(gainNode);
// note: gainNode already connected to destination
newSource.onended = () =>
if (sourceNode === newSource)
isPlaying = false;
playStatusSpan.innerText = '⏹️ finished';
playStatusSpan.style.background = "#3b425b33";
if(animationId) cancelAnimationFrame(animationId);
drawFlatline();
sourceNode = null;
;
sourceNode = newSource;
sourceNode.start(0);
isPlaying = true;
playStatusSpan.innerText = '🎧 PLAYING · pitch shifted';
playStatusSpan.style.background = "#10b98166";
startVisualization();
return true;
}
// 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
// load new audio file
async function loadAudioFile(file)
if (!file) return;
updateFileNameDisplay(file);
playStatusSpan.innerText = '⏳ loading...';
stopPlayback(true);
try
const arrayBuffer = await file.arrayBuffer();
await setupAudioContext();
const decoded = await audioCtx.decodeAudioData(arrayBuffer);
currentBuffer = decoded;
// reset pitch slider to 1.0 after new load
pitchSlider.value = '1.0';
currentPitch = 1.0;
pitchReadout.innerText = '1.00x';
playStatusSpan.innerText = '✅ loaded, ready';
playStatusSpan.style.background = "#2b6e4f33";
// optional: auto-play the new file with current pitch (1.0)
await playWithPitch(1.0);
catch(err)
console.error(err);
playStatusSpan.innerText = '❌ decode error';
fileNameSpan.innerText = ' Error: unsupported format or corrupted file';
currentBuffer = null;
drawFlatline();
// handle semitone conversion: semitones to playbackRate ratio (2^(semitones/12))
function setPitchBySemitone(semitones)
let ratio = Math.pow(2, semitones / 12);
ratio = Math.min(2.0, Math.max(0.5, ratio));
pitchSlider.value = ratio.toFixed(3);
currentPitch = ratio;
pitchReadout.innerText = ratio.toFixed(2) + 'x';
if (currentBuffer)
if (isPlaying)
playWithPitch(ratio);
else
// if not playing, just store value but also can optionally restart
// but we keep consistent
else
// no buffer, just update readout
// ---------- Event listeners ----------
pitchSlider.addEventListener('input', (e) => {
const val = parseFloat(e.target.value);
pitchReadout.innerText = val.toFixed(2) + 'x';
currentPitch = val;
if (currentBuffer && isPlaying) {
// realtime update: we need to recreate source with new rate
// Because Web Audio playbackRate can be changed on the fly without reconnecting!
// BUT we can modify existing sourceNode.playbackRate.value for smooth changes!
if (sourceNode && !sourceNode.playbackRate) {}
if (sourceNode && sourceNode.playbackRate)
// seamless pitch bending without restart (best for continuous)
sourceNode.playbackRate.value = val;
// update currentPitch
else if (sourceNode)
// fallback restart
playWithPitch(val);
else if (!isPlaying)
// nothing playing
else
playWithPitch(val);
} else if (currentBuffer && !isPlaying)
// not playing, but we remember pitch. Option: no action
});
// for semitone buttons
document.querySelectorAll('.st-btn').forEach(btn =>
btn.addEventListener('click', (e) =>
const semitoneVal = parseInt(btn.getAttribute('data-semitone'), 10);
if (isNaN(semitoneVal)) return;
if (semitoneVal === 0)
pitchSlider.value = '1.0';
currentPitch = 1.0;
pitchReadout.innerText = '1.00x';
if (sourceNode && sourceNode.playbackRate)
sourceNode.playbackRate.value = 1.0;
else if (currentBuffer && isPlaying)
playWithPitch(1.0);
else if (currentBuffer && !isPlaying)
// just update slider
else
let currentRatio = parseFloat(pitchSlider.value);
let currentSemitones = Math.log2(currentRatio) * 12;
let newSemitones = currentSemitones + semitoneVal;
let newRatio = Math.pow(2, newSemitones / 12);
newRatio = Math.min(2.0, Math.max(0.5, newRatio));
pitchSlider.value = newRatio;
currentPitch = newRatio;
pitchReadout.innerText = newRatio.toFixed(2) + 'x';
if (sourceNode && sourceNode.playbackRate)
sourceNode.playbackRate.value = newRatio;
else if (currentBuffer && isPlaying)
playWithPitch(newRatio);
else if (currentBuffer && !isPlaying)
// nothing
);
);
// file load trigger
loadBtn.addEventListener('click', () =>
if (audioCtx && audioCtx.state === 'suspended')
audioCtx.resume().then(() => fileInput.click()).catch(()=>fileInput.click());
else
fileInput.click();
);
fileInput.addEventListener('change', (e) =>
if (e.target.files.length > 0)
const file = e.target.files[0];
loadAudioFile(file);
fileInput.value = ''; // allow reload same file again
);
stopBtn.addEventListener('click', () =>
stopPlayback(true);
if (analyserNode)
drawFlatline();
playStatusSpan.innerText = '⏸️ stopped by user';
);
// resume audio context on first user interaction (browser policy)
function resumeOnFirstTouch()
if (audioCtx && audioCtx.state === 'suspended')
audioCtx.resume().then(() =>
playStatusSpan.innerText = '🎧 ready';
).catch(e=>console.warn);
document.body.addEventListener('click', resumeOnFirstTouch, once: true );
document.body.addEventListener('touchstart', resumeOnFirstTouch, once: true );
// Initialize canvas dimensions
function resizeCanvas()
const container = canvas.parentElement;
const computedWidth = container.clientWidth - 24;
canvas.width = Math.max(400, computedWidth);
canvas.height = 130;
drawFlatline();
window.addEventListener('resize', () => resizeCanvas(); if(!isPlaying) drawFlatline(); );
resizeCanvas();
// preload: create a silent context but not initialized until user clicks? No, we init but suspended.
// init audioCtx on demand but not autoplay. But we call setup only on file load.
// final: ensure no errors if pitch slider moves before buffer
pitchSlider.dispatchEvent(new Event('input'));
// Fallback for display when no buffer
drawFlatline();
})();
</script>
</body>
</html>
The Vietnamese phrase "tai phan mem pitch shifter" translates to "download pitch shifter software." Since you specified HTML5, the most useful guide isn't about downloading a traditional executable file (like an .exe), but rather about implementing a web-based audio tool that runs directly in the browser.
Below is a comprehensive guide on how to build your own HTML5 Pitch Shifter. This is useful for developers, musicians, or hobbyists looking to add audio processing to a website. Đối với nội dung về "tai phan mem
Nếu bạn đang phát triển một website cho phép tải pitch shifter, đừng quên:
Pitch Shifter là công cụ thay đổi cao độ (tần số) của âm thanh mà không ảnh hưởng đến tốc độ phát (tempo). Nó được sử dụng phổ biến trong:
Nếu bạn là lập trình viên hoặc muốn kiểm soát hoàn toàn công cụ, dưới đây là code mẫu tạo một Pitch Shifter hoàn chỉnh.