keystrokes/shelf.html at main · aetherwing-io/keystrokes · GitHub

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Keystrokes Shelf — the album of your work</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="style.css">
<link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>📼</text></svg>">
<style>
  .shelf { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
  .cassette {
    background: var(--shell); border: 1px solid var(--line); border-radius: 10px;
    padding: 18px 22px; display: flex; gap: 20px; flex-wrap: wrap; align-items: center;
  }
  .cassette canvas { width: 240px; height: 120px; background: #0b081a; border: 1px solid var(--line); border-radius: 5px; }
  .cassette .info { flex: 1; min-width: 220px; }
  .cassette h2 { font-family: var(--font-display); font-weight: 400; font-size: 17px; letter-spacing: .06em; margin: 0 0 6px; }
  .cassette .meta { font-family: var(--font-mono); font-size: 12px; color: var(--dim); }
  .cassette .row { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; align-items: center; }
  .cassette .status { font-family: var(--font-mono); font-size: 12px; color: var(--amber); }
  .cassette .range { display: flex; gap: 6px; align-items: center; font-family: var(--font-mono); font-size: 11px; color: var(--dim); }
  .cassette .range input { width: 54px; background: var(--well); color: var(--paper); border: 1px solid var(--line); border-radius: 4px; padding: 4px 6px; font-family: var(--font-mono); }
  .btn.danger.armed { border-color: var(--rose); color: var(--rose); }
  .empty { color: var(--dim); text-align: center; padding: 60px 20px; font-size: 14px; }
  header.pagehead { max-width: 860px; margin: 0 auto 20px; display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; }
  header.pagehead .backlink { margin-left: auto; }
  header.pagehead a { color: var(--amber); font-size: 13px; }
</style>
</head>
<body>

<header class="pagehead">
  <h1>THE SHELF<span class="cursor">_</span></h1>
  <span class="tagline">every session is a tape · <b id="backendChip">…</b></span>
  <span class="backlink"><a href="./" id="backLink">← back to the deck</a></span>
</header>

<div class="shelf" id="shelf">
  <div class="empty" id="emptyMsg">Looking for tapes…</div>
</div>

<footer>
  <span>Renders are re-performances from the score — the notes are exact, the tape jitter is fresh each time.</span>
  <span class="privacy" id="privacyNote"></span>
</footer>

<script type="module">
import {
  STYLES, createAudioEngine, fetchSamplePack, makeSampler, decodeSamplerInto, clamp,
} from './engine/core.js';
import { idbOpen, idbSessions, idbSessionEvents, idbDelete } from './engine/idb.js';

const $ = id => document.getElementById(id);
const rawPack = fetchSamplePack();
const RENDER_CAP_S = 45 * 60;
const TIER_COLORS = ['#ffb26b', '#7fd4e4', '#f27ab8'];
const DRUM_EVENTS = new Set(['kick', 'snare', 'ckick', 'csnare', 'rkick', 'gsnare', 'shaker', 'rim', 'hat', 'scratch']);
const DUR_DEFAULT = {
  rhodes: 1.5, saw: 0.75, pulse: 0.32, kalimba: 1.8, claude: 1.35, osc: 1.2,
  stab: 2.75, bass: 0.95, kick: 0.35, snare: 0.3, ckick: 0.2, csnare: 0.15,
  rkick: 0.35, gsnare: 0.25, shaker: 0.15, rim: 0.06, scratch: 0.15,
};
const durOf = ev =>
  ev.e === 'pad' ? (ev.d || 4) :
  ev.e === 'hat' ? (ev.open ? 0.4 : 0.08) :
  (ev.o && ev.o.dur) || DUR_DEFAULT[ev.e] || 0.5;

let backend = 'idb', db = null;

async function loadList() {
  let list = [];
  try {
    const r = await fetch('/sessions', { signal: AbortSignal.timeout(1500) });
    if (r.ok) { backend = 'hub'; list = await r.json(); }
  } catch { /* no hub — browser storage it is */ }
  if (backend === 'idb') {
    db = await idbOpen();
    list = (await idbSessions(db)).map(m => ({
      id: m.sid, startedWall: m.startedWall,
      style: (m.header && m.header.style) || 'lofi',
      duration: m.lastT || 0, events: m.events || 0,
    }));
  }
  $('backendChip').textContent = backend === 'hub' ? 'from ~/.keystrokes' : 'from this browser';
  $('privacyNote').textContent = backend === 'hub'
    ? 'Tapes live in ~/.keystrokes/sessions on this machine.'
    : 'Tapes live in this browser and never leave it.';
  $('backLink').href = backend === 'hub' ? '/' : './';
  render(list);
}

async function loadSession(id) {
  if (backend === 'hub') {
    const text = await (await fetch('/sessions/' + id)).text();
    const lines = text.split('\n').filter(l => l.trim());
    let header = null; const events = [];
    for (const l of lines) {
      try {
        const o = JSON.parse(l);
        if (o.e === 'hdr') header = o; else events.push(o);
      } catch { /* skip bad line */ }
    }
    return { header: header || {}, events };
  }
  const metas = await idbSessions(db);
  const meta = metas.find(m => m.sid === id);
  return { header: (meta && meta.header) || {}, events: await idbSessionEvents(db, id) };
}

function title(item) {
  const d = item.startedWall ? new Date(item.startedWall) : null;
  const day = d ? d.toLocaleDateString(undefined, { weekday: 'short', month: 'short', day: 'numeric' }) : item.id;
  const time = d ? d.toLocaleTimeString(undefined, { hour: 'numeric', minute: '2-digit' }) : '';
  const mins = Math.max(1, Math.round((item.duration || 0) / 60));
  const styleTitle = (STYLES[item.style] || STYLES.lofi).title.toLowerCase();
  return `${day} · ${time} · ${mins} min · ${styleTitle}`;
}

function drawCover(canvas, events, duration) {
  const W = canvas.width = 480, H = canvas.height = 240;
  const c = canvas.getContext('2d');
  c.fillStyle = '#0b081a'; c.fillRect(0, 0, W, H);
  const dur = Math.max(duration, 1);
  for (const ev of events) {
    if (typeof ev.t !== 'number') continue;
    const x = (ev.t / dur) * (W - 16) + 8;
    if (DRUM_EVENTS.has(ev.e)) {
      c.fillStyle = 'rgba(163,150,191,0.25)';
      c.fillRect(x, H - 18 + (ev.e.charCodeAt(0) % 10), 2, 2);
      continue;
    }
    if (typeof ev.m !== 'number') continue;
    const y = H - 24 - ((clamp(ev.m, 36, 96) - 36) / 60) * (H - 44);
    if (ev.e === 'claude' || ev.c) {
      c.strokeStyle = 'rgba(127,212,228,0.5)';
      c.strokeRect(x - 1.5, y - 1.5, 3, 3);
    } else {
      const tier = (ev.o && ev.o.tier) ?? ev.x ?? 1;
      c.fillStyle = TIER_COLORS[Math.min(2, tier)] + '99';
      c.fillRect(x - 1.5, y - 1.5, 3, 3);
    }
  }
  c.fillStyle = 'rgba(236,230,244,0.35)';
  c.font = '10px ui-monospace, monospace';
  c.fillText('keystrokes', 10, H - 8);
}

async function renderAudio(events, header, rangeS, rangeE, onProgress) {
  const s = Math.max(0, rangeS || 0);
  const e = Math.min(rangeE ?? Infinity, s + RENDER_CAP_S);
  const slice = events.filter(ev => typeof ev.t === 'number' && ev.t >= s - 15 && ev.t <= e);
  let end = 0;
  for (const ev of slice) end = Math.max(end, ev.t + durOf(ev));
  const lenS = Math.min(end - s, RENDER_CAP_S) + 2;
  if (lenS <= 2) throw new Error('nothing in range');

  const off = new OfflineAudioContext(2, Math.ceil(lenS * 44100), 44100);
  const sampler = makeSampler();
  await decodeSamplerInto(off, sampler, rawPack);
  const st = { style: STYLES[header.style] || STYLES.lofi };
  const eng = createAudioEngine(off, {
    sampler,
    getStyle: () => st.style,
    getCrackle: () => ((header.crackle ?? 45) / 100) * 0.16,
  });
  eng.buildBed(0);

  const V = eng.voices;
  let i = 0;
  for (const ev of slice) {
    const T = Math.max(0, ev.t - s) + 0.05;
    try { applyEvent(ev, eng, V, st, T); } catch { /* one bad event won't kill a render */ }
    if (++i % 2000 === 0) {
      onProgress(Math.round((i / slice.length) * 50));
      await new Promise(r => setTimeout(r));
    }
  }
  onProgress(60);
  const buf = await off.startRendering();
  onProgress(100);
  {
    // introspection for tests + honest "did this render silence?" checks
    const d = buf.getChannelData(0);
    let peak = 0, rms = 0, nSamp = 0;
    for (let i = 0; i < d.length; i += 50) {
      const a = Math.abs(d[i]);
      if (a > peak) peak = a;
      rms += d[i] * d[i]; nSamp++;
    }
    window.__lastRender = {
      seconds: Math.round(buf.duration * 10) / 10,
      peak: Math.round(peak * 1000) / 1000,
      rms: Math.round(Math.sqrt(rms / nSamp) * 10000) / 10000,
      events: slice.length,
    };
  }
  return buf;
}

function applyEvent(ev, eng, V, st, T) {
  switch (ev.e) {
    case 'set':
      if (ev.k === 'style') { st.style = STYLES[ev.val] || st.style; eng.buildBed(T); }
      else if (ev.k === 'crackle') eng.setCrackleAt((ev.val / 100) * 0.16, T);
      break;
    case 'auto':
      eng.drumBus.gain.setTargetAtTime(Math.pow(ev.a, 1.15) * 0.9, T, 0.8);
      eng.masterFilter.frequency.setTargetAtTime(950 + ev.a * 1700 + (ev.ch ? 400 : 0), T, 1.2);
      break;
    case 'rhodes':  V.rhodesNote(ev.m, ev.v, T, ev.o || {}); break;
    case 'pulse':   V.playPulse(ev.m, ev.v, T, ev.x); break;
    case 'saw':     V.playSawLead(ev.m, ev.v, T, ev.x); break;
    case 'kalimba': V.playKalimba(ev.m, ev.v, T); break;
    case 'osc':     V.playMelodyOsc(ev.m, ev.v, T, ev.x); break;
    case 'claude':  V.playClaude(ev.m, ev.v, T); break;
    case 'stab':    V.playStabTone(ev.m, ev.v, T); break;
    case 'pad':     V.playPadChord(ev.vc || [], T, ev.d || 4, !!ev.soft); break;
    case 'bass':    V.bassHit(ev.m, ev.v, T, ev.o || {}); break;
    case 'hat':     V.hatTick(T, ev.v, !!ev.open, !!ev.dr); break;
    case 'kick':    V.kickBoom(T, ev.v); break;
    case 'snare':   V.snareDust(T, ev.v); break;
    case 'ckick':   V.chipKick(T, ev.v); break;
    case 'csnare':  V.chipSnare(T, ev.v); break;
    case 'rkick':   V.retroKick(T, ev.v); break;
    case 'gsnare':  V.gatedSnare(T, ev.v); break;
    case 'shaker':  V.shaker(T, ev.v); break;
    case 'rim':     V.playRim(T, ev.v); break;
    case 'scratch': V.playScratch(T); break;
  }
}

function encodeWav(buf) {
  const n = buf.length, sr = buf.sampleRate;
  const ab = new ArrayBuffer(44 + n * 4);
  const dv = new DataView(ab);
  const wstr = (o, str) => { for (let i = 0; i < str.length; i++) dv.setUint8(o + i, str.charCodeAt(i)); };
  wstr(0, 'RIFF'); dv.setUint32(4, 36 + n * 4, true); wstr(8, 'WAVE');
  wstr(12, 'fmt '); dv.setUint32(16, 16, true); dv.setUint16(20, 1, true); dv.setUint16(22, 2, true);
  dv.setUint32(24, sr, true); dv.setUint32(28, sr * 4, true); dv.setUint16(32, 4, true); dv.setUint16(34, 16, true);
  wstr(36, 'data'); dv.setUint32(40, n * 4, true);
  const L = buf.getChannelData(0), R = buf.getChannelData(1);
  let o = 44;
  for (let i = 0; i < n; i++) {
    dv.setInt16(o, Math.max(-1, Math.min(1, L[i])) * 32767, true); o += 2;
    dv.setInt16(o, Math.max(-1, Math.min(1, R[i])) * 32767, true); o += 2;
  }
  return new Blob([ab], { type: 'audio/wav' });
}

let playingSrc = null, playingCtx = null;

function render(list) {
  const shelf = $('shelf');
  shelf.innerHTML = '';
  if (!list.length) {
    shelf.innerHTML = '<div class="empty">No tapes yet. Go type some music on the deck — sessions land here automatically.</div>';
    return;
  }
  for (const item of list) {
    const card = document.createElement('div');
    card.className = 'cassette';
    const durMin = (item.duration || 0) / 60;
    card.innerHTML = `
      <canvas></canvas>
      <div class="info">
        <h2>${title(item)}</h2>
        <div class="meta">${(item.events || 0).toLocaleString()} sound events${item.peakEpm ? ' · peak ' + item.peakEpm + '/min' : ''}</div>
        <div class="row">
          <button class="btn play">▶ Render &amp; play</button>
          <button class="btn wav" disabled>↓ WAV</button>
          <button class="btn danger del">✕</button>
          <span class="status"></span>
        </div>
        ${durMin > 45 ? `<div class="range">render <input type="number" class="rs" value="0" min="0"> to <input type="number" class="re" value="45" min="1"> min (45 max per render)</div>` : ''}
      </div>`;
    shelf.appendChild(card);

    const status = card.querySelector('.status');
    const playBtn = card.querySelector('.play');
    const wavBtn = card.querySelector('.wav');
    const delBtn = card.querySelector('.del');
    let rendered = null, loaded = null;

    playBtn.addEventListener('click', async () => {
      if (playingSrc) { try { playingSrc.stop(); } catch { /* done */ } playingSrc = null; }
      try {
        playBtn.disabled = true;
        status.textContent = 'loading…';
        loaded ??= await loadSession(item.id);
        drawCover(card.querySelector('canvas'), loaded.events, item.duration || 1);
        const rs = card.querySelector('.rs'), re = card.querySelector('.re');
        const s = rs ? (+rs.value || 0) * 60 : 0;
        const e = re ? (+re.value || 45) * 60 : undefined;
        status.textContent = 'rendering…';
        rendered = await renderAudio(loaded.events, loaded.header, s, e,
          p => { status.textContent = 'rendering… ' + p + '%'; });
        wavBtn.disabled = false;
        status.textContent = 'playing';
        playingCtx ??= new AudioContext();
        playingCtx.resume().catch(() => {});
        const src = playingCtx.createBufferSource();
        src.buffer = rendered;
        src.connect(playingCtx.destination);
        src.onended = () => { if (playingSrc === src) { status.textContent = ''; playingSrc = null; } };
        src.start();
        playingSrc = src;
      } catch (err) {
        status.textContent = String(err.message || err);
      } finally {
        playBtn.disabled = false;
      }
    });

    wavBtn.addEventListener('click', () => {
      if (!rendered) return;
      const a = document.createElement('a');
      a.href = URL.createObjectURL(encodeWav(rendered));
      a.download = 'keystrokes-' + item.id + '.wav';
      a.click();
      setTimeout(() => URL.revokeObjectURL(a.href), 5000);
    });

    delBtn.addEventListener('click', async () => {
      if (!delBtn.classList.contains('armed')) {
        delBtn.classList.add('armed');
        delBtn.textContent = 'sure?';
        setTimeout(() => { delBtn.classList.remove('armed'); delBtn.textContent = '✕'; }, 3000);
        return;
      }
      if (backend === 'hub') await fetch('/sessions/' + item.id, { method: 'DELETE' });
      else await idbDelete(db, item.id);
      card.remove();
    });
  }
}

loadList();
</script>
</body>
</html>