Add music and voice assets

2026-06-22 00:21:45 +09:00
parent 674fbe6659
commit e45ad9e5ea
26 changed files with 652 additions and 50 deletions
--- a/scripts/generate-bgm.mjs
+++ b/scripts/generate-bgm.mjs
@@ -0,0 +1,227 @@
+import { mkdirSync, writeFileSync } from 'node:fs';
+import { join } from 'node:path';
+
+const sampleRate = 22050;
+const duration = 32;
+const outputDir = 'src/assets/audio/bgm';
+
+mkdirSync(outputDir, { recursive: true });
+
+const tracks = [
+  {
+    name: 'title-theme',
+    root: 196,
+    tempo: 72,
+    drum: 0.34,
+    melody: [0, 2, 4, 7, 9, 7, 4, 2],
+    bass: [0, 0, -5, -3],
+    color: 'warm'
+  },
+  {
+    name: 'story-dark',
+    root: 146.83,
+    tempo: 58,
+    drum: 0.22,
+    melody: [0, -3, 0, 2, -5, -3, 0, -7],
+    bass: [0, -7, -5, -3],
+    color: 'dark'
+  },
+  {
+    name: 'oath-theme',
+    root: 220,
+    tempo: 66,
+    drum: 0.24,
+    melody: [0, 4, 7, 9, 12, 9, 7, 4],
+    bass: [0, -5, -3, -7],
+    color: 'gold'
+  },
+  {
+    name: 'militia-theme',
+    root: 174.61,
+    tempo: 82,
+    drum: 0.42,
+    melody: [0, 2, 5, 7, 9, 7, 5, 2],
+    bass: [0, -5, 0, -3],
+    color: 'earth'
+  },
+  {
+    name: 'battle-prep',
+    root: 164.81,
+    tempo: 94,
+    drum: 0.5,
+    melody: [0, 3, 5, 7, 10, 7, 5, 3],
+    bass: [0, 0, -2, -5],
+    color: 'steel'
+  }
+];
+
+for (const track of tracks) {
+  const buffer = new Float32Array(sampleRate * duration);
+  buildTrack(buffer, track);
+  normalize(buffer, 0.86);
+  writeFileSync(join(outputDir, `${track.name}.wav`), encodeWav(buffer));
+}
+
+function buildTrack(buffer, track) {
+  const beat = 60 / track.tempo;
+  const bar = beat * 4;
+
+  for (let t = 0; t < duration; t += bar) {
+    for (let i = 0; i < 4; i += 1) {
+      const bassFreq = note(track.root, track.bass[i % track.bass.length] - 12);
+      addTone(buffer, t + i * beat, beat * 1.9, bassFreq, 0.075, 'soft');
+      addTone(buffer, t + i * beat, beat * 1.9, bassFreq * 2, 0.025, 'soft');
+    }
+  }
+
+  for (let t = 0; t < duration; t += beat * 2) {
+    const step = Math.floor(t / (beat * 2)) % track.melody.length;
+    const freq = note(track.root, track.melody[step]);
+    addPluck(buffer, t + 0.04, beat * 1.65, freq, 0.12, track.color);
+    addPluck(buffer, t + beat * 0.95, beat * 0.9, freq * 1.5, 0.045, track.color);
+  }
+
+  for (let t = 0; t < duration; t += beat) {
+    if (Math.round(t / beat) % 4 === 0) {
+      addDrum(buffer, t, 0.26, track.drum);
+    } else if (track.drum > 0.3 && Math.round(t / beat) % 2 === 0) {
+      addDrum(buffer, t, 0.16, track.drum * 0.45);
+    }
+  }
+
+  for (let t = 0; t < duration; t += bar * 2) {
+    addNoiseWash(buffer, t, bar * 1.8, track.color === 'dark' ? 0.012 : 0.007);
+  }
+
+  for (let i = 0; i < buffer.length; i += 1) {
+    const seconds = i / sampleRate;
+    const edge = Math.min(1, seconds / 0.6, (duration - seconds) / 0.6);
+    buffer[i] *= Math.max(0, edge);
+  }
+}
+
+function note(root, semitone) {
+  return root * 2 ** (semitone / 12);
+}
+
+function addTone(buffer, start, length, freq, gain, shape) {
+  const startIndex = Math.floor(start * sampleRate);
+  const count = Math.floor(length * sampleRate);
+
+  for (let i = 0; i < count; i += 1) {
+    const index = startIndex + i;
+    if (index >= buffer.length) {
+      break;
+    }
+
+    const t = i / sampleRate;
+    const env = Math.sin(Math.PI * Math.min(1, i / count));
+    const wave = Math.sin(2 * Math.PI * freq * t) + Math.sin(2 * Math.PI * freq * 2 * t) * 0.18;
+    buffer[index] += wave * gain * env * (shape === 'soft' ? 0.78 : 1);
+  }
+}
+
+function addPluck(buffer, start, length, freq, gain, color) {
+  const startIndex = Math.floor(start * sampleRate);
+  const count = Math.floor(length * sampleRate);
+  const brightness = color === 'gold' ? 0.36 : color === 'steel' ? 0.42 : 0.28;
+
+  for (let i = 0; i < count; i += 1) {
+    const index = startIndex + i;
+    if (index >= buffer.length) {
+      break;
+    }
+
+    const t = i / sampleRate;
+    const env = Math.exp(-t * 4.8) * Math.min(1, t / 0.02);
+    const wave =
+      Math.sin(2 * Math.PI * freq * t) +
+      Math.sin(2 * Math.PI * freq * 2 * t) * brightness +
+      Math.sin(2 * Math.PI * freq * 3 * t) * 0.14;
+    buffer[index] += wave * gain * env;
+  }
+}
+
+function addDrum(buffer, start, length, gain) {
+  const startIndex = Math.floor(start * sampleRate);
+  const count = Math.floor(length * sampleRate);
+  let seed = 1337 + startIndex;
+
+  for (let i = 0; i < count; i += 1) {
+    const index = startIndex + i;
+    if (index >= buffer.length) {
+      break;
+    }
+
+    const t = i / sampleRate;
+    const env = Math.exp(-t * 15);
+    const freq = 96 - t * 120;
+    seed = (seed * 1664525 + 1013904223) >>> 0;
+    const noise = ((seed / 0xffffffff) * 2 - 1) * 0.18;
+    const wave = Math.sin(2 * Math.PI * Math.max(42, freq) * t) + noise;
+    buffer[index] += wave * gain * env;
+  }
+}
+
+function addNoiseWash(buffer, start, length, gain) {
+  const startIndex = Math.floor(start * sampleRate);
+  const count = Math.floor(length * sampleRate);
+  let seed = 4219 + startIndex;
+  let previous = 0;
+
+  for (let i = 0; i < count; i += 1) {
+    const index = startIndex + i;
+    if (index >= buffer.length) {
+      break;
+    }
+
+    seed = (seed * 1103515245 + 12345) >>> 0;
+    const raw = (seed / 0xffffffff) * 2 - 1;
+    previous = previous * 0.98 + raw * 0.02;
+    const env = Math.sin(Math.PI * i / count);
+    buffer[index] += previous * gain * env;
+  }
+}
+
+function normalize(buffer, target) {
+  let peak = 0;
+  for (const value of buffer) {
+    peak = Math.max(peak, Math.abs(value));
+  }
+
+  if (peak === 0) {
+    return;
+  }
+
+  const scale = target / peak;
+  for (let i = 0; i < buffer.length; i += 1) {
+    buffer[i] *= scale;
+  }
+}
+
+function encodeWav(buffer) {
+  const bytesPerSample = 2;
+  const dataSize = buffer.length * bytesPerSample;
+  const wav = Buffer.alloc(44 + dataSize);
+
+  wav.write('RIFF', 0);
+  wav.writeUInt32LE(36 + dataSize, 4);
+  wav.write('WAVE', 8);
+  wav.write('fmt ', 12);
+  wav.writeUInt32LE(16, 16);
+  wav.writeUInt16LE(1, 20);
+  wav.writeUInt16LE(1, 22);
+  wav.writeUInt32LE(sampleRate, 24);
+  wav.writeUInt32LE(sampleRate * bytesPerSample, 28);
+  wav.writeUInt16LE(bytesPerSample, 32);
+  wav.writeUInt16LE(16, 34);
+  wav.write('data', 36);
+  wav.writeUInt32LE(dataSize, 40);
+
+  for (let i = 0; i < buffer.length; i += 1) {
+    const value = Math.max(-1, Math.min(1, buffer[i]));
+    wav.writeInt16LE(Math.round(value * 32767), 44 + i * bytesPerSample);
+  }
+
+  return wav;
+}
--- a/scripts/generate-voice-assets.mjs
+++ b/scripts/generate-voice-assets.mjs
@@ -0,0 +1,127 @@
+import { mkdirSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { spawnSync } from 'node:child_process';
+
+const outputDir = resolve('src/assets/audio/voice/prologue');
+
+mkdirSync(outputDir, { recursive: true });
+
+const voiceName = 'Microsoft Heami Desktop';
+
+const lines = [
+  {
+    name: 'yellow-turban-chaos',
+    role: 'narrator',
+    rate: -2,
+    volume: 86,
+    text: '중평 원년, 황건의 깃발이 각지에서 일어섰다. 관군은 흩어지고, 마을마다 불안한 소문이 번져갔다.'
+  },
+  {
+    name: 'liu-bei-resolve',
+    role: 'liuBei',
+    rate: -1,
+    volume: 92,
+    text: '천실의 백성이 이토록 고통받는데, 어찌 초개처럼 그늘에 숨어 있을 수 있겠는가.'
+  },
+  {
+    name: 'zhang-fei-joins',
+    role: 'zhangFei',
+    rate: 1,
+    volume: 100,
+    text: '좋소! 나라를 바로잡고 백성을 구한다면, 내 재산과 힘을 모두 아끼지 않겠소.'
+  },
+  {
+    name: 'guan-yu-joins',
+    role: 'guanYu',
+    rate: -3,
+    volume: 95,
+    text: '서로의 뜻을 믿고 의로운 길을 함께한다면, 천 리라도 멀다 하지 않겠습니다.'
+  },
+  {
+    name: 'oath-narration',
+    role: 'narrator',
+    rate: -2,
+    volume: 88,
+    text: '복사꽃 향기가 흩날리는 동산에서 세 사람은 하늘과 땅 앞에 고했다.'
+  },
+  {
+    name: 'oath-liu-bei',
+    role: 'liuBei',
+    rate: -1,
+    volume: 94,
+    text: '우리는 태어난 날은 달라도, 오늘부터 뜻을 함께한다. 백성을 구하고 천하를 바로 세우는 길에서 물러서지 않겠다.'
+  },
+  {
+    name: 'oath-brothers',
+    role: 'guanYu',
+    rate: -3,
+    volume: 96,
+    text: '의리를 저버리지 않고, 형제를 저버리지 않겠습니다.'
+  },
+  {
+    name: 'militia-rises',
+    role: 'zhangFei',
+    rate: 1,
+    volume: 100,
+    text: '창을 들 사람은 앞으로 나오시오! 오늘 모인 이름 없는 무리가 내일의 방패가 될 것이오!'
+  },
+  {
+    name: 'first-sortie',
+    role: 'liuBei',
+    rate: -1,
+    volume: 94,
+    text: '우리는 아직 작다. 그러나 오늘 한 마을을 지켜낸다면, 그 뜻은 천하로 번져갈 것이다.'
+  },
+  {
+    name: 'battle-briefing',
+    role: 'narrator',
+    rate: -2,
+    volume: 88,
+    text: '의용군은 마을 입구로 향했다. 첫 전투가 곧 시작된다.'
+  }
+];
+
+for (const line of lines) {
+  const output = resolve(outputDir, `${line.name}.wav`);
+  generateVoice({ ...line, output });
+}
+
+function generateVoice(item) {
+  const payload = Buffer.from(JSON.stringify({ ...item, voiceName }), 'utf8').toString('base64');
+  const powershell = `
+$ErrorActionPreference = 'Stop'
+$ProgressPreference = 'SilentlyContinue'
+Add-Type -AssemblyName System.Speech
+$payload = '${payload}'
+$json = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($payload))
+$item = $json | ConvertFrom-Json
+$synth = New-Object System.Speech.Synthesis.SpeechSynthesizer
+try {
+  try {
+    $synth.SelectVoice($item.voiceName)
+  } catch {
+    $installed = $synth.GetInstalledVoices() | ForEach-Object { $_.VoiceInfo.Name }
+    if ($installed.Count -gt 0) {
+      $synth.SelectVoice($installed[0])
+    }
+  }
+  $synth.Rate = [int]$item.rate
+  $synth.Volume = [int]$item.volume
+  $synth.SetOutputToWaveFile($item.output)
+  $synth.Speak($item.text)
+} finally {
+  $synth.Dispose()
+}
+`;
+
+  const encodedCommand = Buffer.from(powershell, 'utf16le').toString('base64');
+  const result = spawnSync(
+    'powershell.exe',
+    ['-NoProfile', '-ExecutionPolicy', 'Bypass', '-EncodedCommand', encodedCommand],
+    { stdio: 'inherit' }
+  );
+
+  if (result.status !== 0) {
+    throw new Error(`Failed to generate voice asset: ${item.name}`);
+  }
+}