52 lines
2.3 KiB
TypeScript
52 lines
2.3 KiB
TypeScript
import { test, expect } from "bun:test";
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import { renderMidi } from "../../src/align/render.ts";
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import { peaks } from "../../src/align/peaks.ts";
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import { makeWarp } from "../../src/align/warp.ts";
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import type { RefTrack, RefNote } from "../../src/align/smf.ts";
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const SF2 = new Uint8Array(await Bun.file("node_modules/@coderline/alphatab/dist/soundfont/sonivox.sf2").arrayBuffer());
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const note = (onset: number, offset: number, pitch: number): RefNote => ({ onset, offset, pitch, velocity: 100, channel: 0 });
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const track = (notes: RefNote[], isDrums = false): RefTrack => ({ index: 0, name: "t", program: 25, isDrums, notes });
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const SR = 44100; // alphaSynth yields NaN at 22050 Hz
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function firstAbove(x: Float32Array, thr: number): number {
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for (let i = 0; i < x.length; i++) if (Math.abs(x[i]!) > thr) return i;
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return -1;
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}
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test("warp offset moves the note onset", () => {
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const a = renderMidi([track([note(1, 2, 60)])], makeWarp([{ midiSec: 0, audioSec: 0.5, kind: "manual" }]), SF2, { sampleRate: SR, mono: true, durationSec: 4 });
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expect(a.channels.length).toBe(1);
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expect(a.channels[0]!.length).toBe(4 * SR);
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const t = firstAbove(a.channels[0]!, 0.02) / SR;
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expect(t).toBeGreaterThan(1.48);
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expect(t).toBeLessThan(1.52);
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});
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test("dense chord is peak-normalised to -1 dBFS", () => {
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const notes = Array.from({ length: 20 }, (_, i) => note(0, 1, 40 + i * 2));
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const a = renderMidi([track(notes)], makeWarp([]), SF2, { sampleRate: SR });
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let p = 0;
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for (const c of a.channels) for (const v of c) p = Math.max(p, Math.abs(v));
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expect(p).toBeLessThanOrEqual(Math.pow(10, -1 / 20) + 1e-3);
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expect(p).toBeGreaterThan(0.85);
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});
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test("drums track is audible", () => {
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const a = renderMidi([track([note(0.2, 0.3, 38)], true)], makeWarp([]), SF2, { sampleRate: SR, durationSec: 1 });
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expect(a.channels[0]!.some((v) => Math.abs(v) > 0.1)).toBe(true);
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});
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test("peaks of a known sine", () => {
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const x = new Float32Array(1000).map((_, i) => Math.sin((2 * Math.PI * i) / 100));
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const p = peaks(x, 10);
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expect(p.max.length).toBe(10);
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for (let b = 0; b < 10; b++) {
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expect(p.max[b]!).toBeCloseTo(1, 1);
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expect(p.min[b]!).toBeCloseTo(-1, 1);
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}
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const q = peaks(new Float32Array([0.5, 0.25, -0.75, 0]), 2);
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expect([...q.max]).toEqual([0.5, 0]);
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expect([...q.min]).toEqual([0.25, -0.75]);
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});
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