html-volume-control/volume-control.html at main · IntMainLoop/html-volume-control · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Volume Engine V34 - File Playback Fixed</title>
    <style>
        body { font-family: monospace; background: #050505; color: #00ff00; padding: 10px; display: flex; flex-direction: column; align-items: center; margin: 0; }
        .panel { background: #111; border: 1px solid #00ff00; padding: 15px; width: 620px; box-shadow: 0 0 20px #00ff0033; box-sizing: border-box; overflow: hidden; }
        .row { margin-bottom: 8px; display: flex; flex-direction: column; }
        label { font-size: 9px; color: #008800; text-transform: uppercase; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        input, select { background: #000; border: 1px solid #008800; color: #00ff00; padding: 6px; font-size: 11px; font-family: monospace; outline: none; box-sizing: border-box; width: 100%; }
        .grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
        .master-readout { border: 1px solid #008800; padding: 10px; text-align: center; margin-bottom: 10px; background: #000; }
        #db_readout { font-size: 2.2rem; font-weight: bold; line-height: 1; }
        .bar-container { height: 12px; width: 100%; background: #000; border: 1px solid #004400; position: relative; margin-top: 8px; }
        #volume_bar { height: 100%; width: 0%; background: #00ff00; box-shadow: 0 0 10px #00ff0066; }
        .engine-view { display: flex; gap: 15px; height: 260px; margin-bottom: 15px; align-items: stretch; }
        .viz, .ctrl-container { flex: 1; aspect-ratio: 1 / 1; border: 1px solid #004400; background: #080808; display: flex; justify-content: center; align-items: center; overflow: hidden; position: relative; }
        svg { height: 100%; width: 100%; display: block; overflow: visible; }
        input[type="range"] { appearance: none; background: #002200; height: 10px; width: 85%; cursor: pointer; }
        input[type="range"]::-webkit-slider-thumb { appearance: none; height: 20px; width: 10px; background: #00ff00; border: 1px solid #000; }
        .slider-v { transform: rotate(-90deg); transform-origin: center; cursor: ns-resize; }
        .slider-h { cursor: ew-resize; }
        .knob-svg { cursor: ns-resize; touch-action: none; overflow: visible; display: block; }
        .knob-svg * { pointer-events: none; }
        .knob-track { fill: none; stroke: #1a1a1a; stroke-width: 6; stroke-linecap: round; }
        .knob-value { fill: none; stroke: #00ff00; stroke-width: 6; stroke-linecap: round; }
        .knob-center { fill: #111; stroke: #008800; stroke-width: 2; }
        .knob-indicator { fill: #00ff00; }
        #audio_btn { width: 100%; padding: 12px; background: #003300; color: #00ff00; border: 1px solid #00ff00; cursor: pointer; font-family: monospace; font-weight: bold; margin-bottom: 8px; font-size: 11px; }
        #audio_btn.active { background: #ff0000; color: #fff; }
        .hidden { display: none !important; }
    </style>
</head>
<body>
<div class="panel">
    <button id="audio_btn">INITIALIZE ENGINE</button>
    <div class="master-readout">
        <div id="db_readout">-- dBFS</div>
        <div class="bar-container"><div id="volume_bar"></div></div>
    </div>
    <div class="engine-view">
        <div class="viz">
            <svg viewBox="0 0 100 100">
                <line x1="50" y1="0" x2="50" y2="100" stroke="#003300" stroke-width="0.5" />
                <path id="curve_path" d="" fill="none" stroke="#00ff00" stroke-width="2" />
                <circle id="tracker_dot" r="3" fill="#fff" />
                <rect id="pivot_box" width="6" height="6" fill="none" stroke="#ff0000" stroke-width="1.5" style="display:none;" />
            </svg>
        </div>
        <div class="ctrl-container" id="work_area">
            <input type="range" id="slider" min="0" max="100" step="0.0001" value="50">
            <div id="knob_wrapper">
                <svg id="knob_svg" class="knob-svg" viewBox="0 0 100 100">
                    <path class="knob-track" d="M 21.7 78.3 A 40 40 0 1 1 78.3 78.3" />
                    <path id="knob_arc" class="knob-value" d="" />
                    <circle class="knob-center" cx="50" cy="50" r="32" />
                    <circle id="knob_ptr" class="knob-indicator" cx="50" cy="18" r="3" />
                </svg>
            </div>
        </div>
    </div>
    <div class="grid">
        <div class="row"><label>Interface Type</label><select id="ui_type"><option value="knob" selected>Rotary Dial</option><option value="slider_h">H Slider</option><option value="slider_v">V Slider</option></select></div>
        <div class="row"><label>Algorithm</label><select id="logic_type"><option value="inv_sigmoid" selected>Inv-Sigmoid (Cosine)</option><option value="s_curve">S-Curve (Cosine)</option><option value="linear">Linear</option><option value="log">Logarithmic</option></select></div>
    </div>
    <div class="grid">
        <div class="row"><label>Audio Source</label>
            <select id="source_type"><option value="440">440Hz Sine</option><option value="1000">1kHz Sine</option><option value="white">White Noise</option><option value="pink">Pink Noise</option><option value="file">Local File (URI)</option></select>
            <div id="file_ui" class="hidden"><input type="file" id="file_input" accept="audio/*"></div>
        </div>
        <div class="row"><label>Control Size (%)</label><input type="number" id="ctrl_size_pct" value="85"></div>
    </div>
    <div class="grid">
        <div class="row"><label>Min dBFS</label><input type="number" id="min_db" value="-80"></div>
        <div class="row"><label>Max dBFS</label><input type="number" id="max_db" value="0"></div>
        <div class="row pivot-ui"><label>Pivot dB</label><input type="number" id="pivot_db" value="-40.0"></div>
        <div class="row pivot-ui"><label>Pivot %</label><input type="number" id="pivot_pos" value="50"></div>
    </div>
</div>
<script>
const el = id => document.getElementById(id);
let audioCtx, currentSource, gainNode, isRunning = false;

function createNoise(type) {
    const bufSize = (audioCtx?.sampleRate || 44100) * 2;
    const buf = audioCtx.createBuffer(1, bufSize, audioCtx.sampleRate);
    const d = buf.getChannelData(0);
    let b0=0, b1=0, b2=0, b3=0, b4=0, b5=0, b6=0;
    for (let i = 0; i < bufSize; i++) {
        const w = Math.random() * 2 - 1;
        if(type==='white') { d[i] = w; } else {
            b0 = 0.99886 * b0 + w * 0.0555179; b1 = 0.99332 * b1 + w * 0.0750312;
            b2 = 0.96900 * b2 + w * 0.1538520; b3 = 0.86650 * b3 + w * 0.3104856;
            b4 = 0.55000 * b4 + w * 0.5329522; b5 = -0.7616 * b5 - w * 0.0168980;
            d[i] = (b0 + b1 + b2 + b3 + b4 + b5 + b6 + w * 0.5362) * 0.11;
            b6 = w * 0.115926;
        }
    }
    const node = audioCtx.createBufferSource(); node.buffer = buf; node.loop = true; return node;
}

async function setupSource() {
    if (currentSource) { try { currentSource.stop(); } catch(e){} currentSource.disconnect(); }
    const type = el('source_type').value;

    if (type === 'file') {
        const files = el('file_input').files;
        if (!files || files.length === 0) {
            console.log("No file selected.");
            return;
        }
        try {
            const arrayBuf = await files[0].arrayBuffer();
            const audioBuf = await audioCtx.decodeAudioData(arrayBuf);
            currentSource = audioCtx.createBufferSource();
            currentSource.buffer = audioBuf;
            currentSource.loop = true;
        } catch(e) {
            console.error("Audio decoding failed", e);
            return;
        }
    } else if (type === 'white' || type === 'pink') {
        currentSource = createNoise(type);
    } else {
        currentSource = audioCtx.createOscillator();
        currentSource.frequency.value = parseFloat(type);
    }

    currentSource.connect(gainNode);
    if (isRunning) currentSource.start();
}

function calculateDb(x) {
    const max = parseFloat(el('max_db').value), min = parseFloat(el('min_db').value);
    const pDb = parseFloat(el('pivot_db').value), pPos = parseFloat(el('pivot_pos').value)/100;
    const mode = el('logic_type').value, val = x / 100;
    if (mode === 'linear') return min + (val * (max - min));
    if (mode === 'log') return Math.max(min, max + (20 * Math.log10(val || 1e-10)));
    const pRatio = (pDb - min) / (max - min);
    let ratio;
    if (val <= pPos) {
        const norm = val / (pPos || 0.001);
        const cosFactor = mode === 's_curve' ? (1 - Math.cos(norm * Math.PI / 2)) : Math.sin(norm * Math.PI / 2);
        ratio = pRatio * cosFactor;
    } else {
        const norm = (val - pPos) / (1 - pPos || 0.001);
        const cosFactor = mode === 's_curve' ? Math.sin(norm * Math.PI / 2) : (1 - Math.cos(norm * Math.PI / 2));
        ratio = pRatio + (1 - pRatio) * cosFactor;
    }
    return min + (ratio * (max - min));
}

function update() {
    const x = parseFloat(el('slider').value), db = calculateDb(x);
    const max = parseFloat(el('max_db').value), min = parseFloat(el('min_db').value);
    const uiMode = el('ui_type').value, pct = parseFloat(el('ctrl_size_pct').value) / 100;
    el('db_readout').innerText = db.toFixed(2) + " dBFS";
    el('volume_bar').style.width = Math.max(0, Math.min(100, ((db - min) / (max - min)) * 100)) + "%";
    if (isRunning && gainNode) gainNode.gain.setTargetAtTime(Math.pow(10, db/20), audioCtx.currentTime, 0.025);
    el('slider').classList.toggle('hidden', uiMode === 'knob');
    el('knob_wrapper').classList.toggle('hidden', uiMode !== 'knob');
    el('file_ui').classList.toggle('hidden', el('source_type').value !== 'file');
    const area = el('work_area');
    const dim = Math.min(area.offsetWidth, area.offsetHeight) * pct;
    if (uiMode === 'slider_v') { el('slider').className = 'slider-v'; el('slider').style.width = dim + "px"; }
    else if (uiMode === 'slider_h') { el('slider').className = 'slider-h'; el('slider').style.width = dim + "px"; }
    else { el('knob_svg').style.width = dim + "px"; el('knob_svg').style.height = dim + "px"; }
    const sweep = (x/100)*270, endRad = (135+sweep)*(Math.PI/180);
    el('knob_arc').setAttribute('d', `M ${50+40*Math.cos(135*Math.PI/180)} ${50+40*Math.sin(135*Math.PI/180)} A 40 40 0 ${sweep>180?1:0} 1 ${50+40*Math.cos(endRad)} ${50+40*Math.sin(endRad)}`);
    el('knob_ptr').setAttribute('cx', 50+24*Math.cos(endRad)); el('knob_ptr').setAttribute('cy', 50+24*Math.sin(endRad));
    let d = "M ";
    for (let i=0; i<=100; i++) {
        const y = 100 - (((calculateDb(i)-min)/(max-min))*100);
        d += `${i},${y} `;
        if (Math.abs(i-x) < 0.5) { el('tracker_dot').setAttribute('cx', i); el('tracker_dot').setAttribute('cy', y); }
    }
    el('curve_path').setAttribute('d', d);
    const isPivot = ['s_curve', 'inv_sigmoid'].includes(el('logic_type').value);
    document.querySelectorAll('.pivot-ui').forEach(u => u.classList.toggle('hidden', !isPivot));
    if (isPivot) {
        el('pivot_box').style.display = 'block';
        el('pivot_box').setAttribute('x', parseFloat(el('pivot_pos').value) - 3);
        el('pivot_box').setAttribute('y', (100 - (((parseFloat(el('pivot_db').value)-min)/(max-min))*100)) - 3);
    } else el('pivot_box').style.display = 'none';
}

let drag = { active: false, lastY: 0 };
const startDrag = y => { drag.active = true; drag.lastY = y; };
const moveDrag = y => { if (!drag.active) return; el('slider').value = Math.max(0, Math.min(100, parseFloat(el('slider').value) + (drag.lastY - y) * 0.5)); drag.lastY = y; update(); };
window.addEventListener('mousedown', e => { if(e.target.closest('#knob_svg') || (e.target.closest('#work_area') && el('ui_type').value!=='knob')) startDrag(e.clientY); });
el('knob_svg').addEventListener('touchstart', e => { startDrag(e.touches[0].clientY); e.preventDefault(); }, {passive:false});
window.addEventListener('mousemove', e => moveDrag(e.clientY));
window.addEventListener('touchmove', e => { if(drag.active) { moveDrag(e.touches[0].clientY); e.preventDefault(); }}, {passive:false});
window.addEventListener('mouseup', () => drag.active = false);
window.addEventListener('touchend', () => drag.active = false);

async function toggleAudio() {
    if (!audioCtx) audioCtx = new (window.AudioContext || window.webkitAudioContext)();
    if (!isRunning) {
        isRunning = true; gainNode = audioCtx.createGain(); gainNode.connect(audioCtx.destination);
        await setupSource();
        el('audio_btn').innerText = "STOP ENGINE"; el('audio_btn').classList.add('active');
    } else {
        isRunning = false; if(currentSource) { try{currentSource.stop();}catch(e){} }
        el('audio_btn').innerText = "INITIALIZE ENGINE"; el('audio_btn').classList.remove('active');
    }
    update();
}

const bind = id => {
    el(id).addEventListener('change', async () => {
        if (isRunning) await setupSource();
        update();
    });
    el(id).addEventListener('keydown', e => { if(e.key==='Enter') { update(); e.target.blur(); }});
};
el('audio_btn').addEventListener('click', toggleAudio); el('slider').addEventListener('input', update);
['min_db', 'max_db', 'pivot_db', 'pivot_pos', 'logic_type', 'ctrl_size_pct', 'ui_type', 'source_type', 'file_input'].forEach(bind);
update();
</script>
</body>
</html>