feat: dataset builder
Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
This commit is contained in:
Lucas Winther
co-authored by
Claude Sonnet 5.5
Claude Sonnet 5.5
parent
a1e9ce86a0
commit
ca9f3bbb83
+19
-5
@@ -2,27 +2,41 @@ import type { Audio } from "../core/types.ts";
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const PEAK_TARGET = Math.pow(10, -1 / 20);
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/** Sum stems (with per-stem gain in dB), then peak-normalise to -1 dBFS. */
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export function mixStems(stems: { audio: Audio; gainDb: number }[]): Audio {
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/**
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* Sum stems (with per-stem gain in dB), then peak-normalise to -1 dBFS.
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* Also returns each input stem as it contributed to the mix (gain and normalisation applied, padded to the
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* mix's channel count and length), so that sum(scaled) === mix, and the applied normalisation factor.
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*/
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export function mixStemsScaled(stems: { audio: Audio; gainDb: number }[]): { mix: Audio; scaled: Audio[]; scale: number } {
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if (stems.length === 0) throw new Error("mixStems: no stems");
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const sr = stems[0]!.audio.sampleRate;
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const nch = Math.max(...stems.map((s) => s.audio.channels.length));
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const n = Math.max(...stems.map((s) => s.audio.channels[0]?.length ?? 0));
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const out = Array.from({ length: nch }, () => new Float32Array(n));
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const scaled: Audio[] = [];
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for (const { audio, gainDb } of stems) {
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if (audio.sampleRate !== sr) throw new Error("mixStems: sample rate mismatch");
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const g = Math.pow(10, gainDb / 20);
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const own = Array.from({ length: nch }, () => new Float32Array(n));
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for (let c = 0; c < nch; c++) {
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const src = audio.channels[c] ?? audio.channels[0]!;
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const dst = out[c]!;
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for (let i = 0; i < src.length; i++) dst[i]! += src[i]! * g;
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const o = own[c]!;
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for (let i = 0; i < src.length; i++) { const v = src[i]! * g; dst[i]! += v; o[i] = v; }
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}
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scaled.push({ sampleRate: sr, channels: own });
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}
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let peak = 0;
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for (const ch of out) for (let i = 0; i < n; i++) peak = Math.max(peak, Math.abs(ch[i]!));
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const k = peak > 0 ? PEAK_TARGET / peak : 1;
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if (peak > 0) {
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const k = PEAK_TARGET / peak;
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for (const ch of out) for (let i = 0; i < n; i++) ch[i]! *= k;
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for (const s of scaled) for (const ch of s.channels) for (let i = 0; i < n; i++) ch[i]! *= k;
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}
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return { sampleRate: sr, channels: out };
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return { mix: { sampleRate: sr, channels: out }, scaled, scale: k };
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}
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/** Sum stems (with per-stem gain in dB), then peak-normalise to -1 dBFS. */
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export function mixStems(stems: { audio: Audio; gainDb: number }[]): Audio {
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return mixStemsScaled(stems).mix;
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}
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@@ -0,0 +1,42 @@
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import { buildSong } from "./dataset.ts";
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import type { TierId } from "../gen/tiers.ts";
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import { TIERS } from "../gen/tiers.ts";
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function parseSeeds(s: string): number[] {
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const out: number[] = [];
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for (const part of s.split(",")) {
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const m = /^(\d+)-(\d+)$/.exec(part);
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if (m) for (let i = Number(m[1]); i <= Number(m[2]); i++) out.push(i);
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else if (/^\d+$/.test(part)) out.push(Number(part));
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else throw new Error(`bad seeds: ${s}`);
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}
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return out;
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}
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function arg(args: string[], name: string, def: string): string {
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const i = args.indexOf(`--${name}`);
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return i >= 0 && args[i + 1] ? args[i + 1]! : def;
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}
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async function main() {
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const [cmd, ...rest] = process.argv.slice(2);
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switch (cmd) {
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case "gen": {
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const tiers = arg(rest, "tiers", "t1a,t1b,t1c,t1d").split(",") as TierId[];
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for (const t of tiers) if (!(t in TIERS)) throw new Error(`unknown tier: ${t}`);
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const seeds = parseSeeds(arg(rest, "seeds", "1-5"));
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const root = arg(rest, "root", "data");
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for (const t of tiers) for (const s of seeds) {
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const t0 = performance.now();
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const dir = await buildSong(t, s, root);
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console.log(`${dir} (${((performance.now() - t0) / 1000).toFixed(1)}s)`);
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}
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break;
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}
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default:
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console.error("usage: bun run bench gen [--tiers t1a,t1b] [--seeds 1-5] [--root data]");
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process.exit(1);
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}
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}
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await main();
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@@ -0,0 +1,55 @@
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import { join } from "node:path";
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import { mkdir } from "node:fs/promises";
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import type { Audio, Song } from "../core/types.ts";
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import type { TierId } from "../gen/tiers.ts";
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import { generateSong } from "../gen/generate.ts";
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import { songToGp, truthFromGp } from "../score/gp.ts";
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import { renderStems } from "../audio/render.ts";
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import { applyTrackFx, pan } from "../audio/fx.ts";
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import { mixStemsScaled } from "../audio/mix.ts";
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import { readWav, writeWav } from "../audio/wav.ts";
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import { encodeMp3 } from "../audio/mp3.ts";
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const SF2_PATH = "node_modules/@coderline/alphatab/dist/soundfont/sonivox.sf2";
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const SR = 44100;
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/**
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* Build one song into `<root>/<tier>-<seed>/`. Idempotent: skipped when mix.mp3 exists and song.json matches.
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* stems/<track>.wav are exactly each track's contribution to mix.wav (post-fx, post-pan, gain, normalisation),
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* so the stems sum to the mix up to PCM16 rounding.
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*/
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export async function buildSong(tier: TierId, seed: number, root = "data"): Promise<string> {
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const dir = join(root, `${tier}-${seed}`);
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const song = generateSong(tier, seed);
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const songJson = JSON.stringify(song, null, 1);
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const jsonFile = Bun.file(join(dir, "song.json"));
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if ((await Bun.file(join(dir, "mix.mp3")).exists()) && (await jsonFile.exists()) && (await jsonFile.text()) === songJson) {
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return dir;
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}
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await mkdir(join(dir, "stems"), { recursive: true });
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const sf2 = new Uint8Array(await Bun.file(SF2_PATH).arrayBuffer());
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const dry = renderStems(song, sf2, SR);
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const inputs = song.tracks.map((t) => {
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const raw = dry.get(t.name);
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if (!raw) throw new Error(`buildSong: no rendered stem for ${t.name}`);
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return { audio: pan(applyTrackFx(raw, t.role, t.fx, SR), t.pan), gainDb: t.gainDb };
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});
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const { mix, scaled } = mixStemsScaled(inputs);
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await Bun.write(join(dir, "truth.gp"), songToGp(song));
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for (let i = 0; i < song.tracks.length; i++) await writeWav(join(dir, "stems", `${song.tracks[i]!.name}.wav`), scaled[i]!);
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await writeWav(join(dir, "mix.wav"), mix);
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await encodeMp3(join(dir, "mix.wav"), join(dir, "mix.mp3"));
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await Bun.write(join(dir, "song.json"), songJson); // written last: marks the build complete
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return dir;
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}
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export async function loadSongDir(dir: string): Promise<{
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song: Song; truth: ReturnType<typeof truthFromGp>; mix: Audio; stems: Map<string, Audio>;
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}> {
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const song = (await Bun.file(join(dir, "song.json")).json()) as Song;
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const truth = truthFromGp(new Uint8Array(await Bun.file(join(dir, "truth.gp")).arrayBuffer()));
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const mix = await readWav(join(dir, "mix.wav"));
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const stems = new Map<string, Audio>();
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for (const t of song.tracks) stems.set(t.name, await readWav(join(dir, "stems", `${t.name}.wav`)));
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return { song, truth, mix, stems };
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}
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