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| 1 | +import { describe, expect, it, vi } from 'vitest'; |
| 2 | + |
| 3 | +import { |
| 4 | + blackmanKernel, |
| 5 | + blackmanStrategy, |
| 6 | + registerBlackmanStrategy, |
| 7 | +} from './index.js'; |
| 8 | + |
| 9 | +describe('blackman interpolation strategy', () => { |
| 10 | + describe('blackmanKernel.createState', () => { |
| 11 | + it('returns default state values', () => { |
| 12 | + const state = blackmanKernel.createState?.() as { |
| 13 | + prevSampleL: number; |
| 14 | + prevSampleR: number; |
| 15 | + params: { radius: number }; |
| 16 | + }; |
| 17 | + |
| 18 | + expect(state.prevSampleL).toBe(0); |
| 19 | + expect(state.prevSampleR).toBe(0); |
| 20 | + expect(state.params.radius).toBe(4); |
| 21 | + }); |
| 22 | + }); |
| 23 | + |
| 24 | + describe('blackmanKernel', () => { |
| 25 | + it('returns finite interpolated values for in-range positions', () => { |
| 26 | + const src = new Float32Array([1, 2, 3, 4, 5, 6, 7, 8]); |
| 27 | + const state = { |
| 28 | + prevSampleL: 0, |
| 29 | + prevSampleR: 0, |
| 30 | + params: { radius: 4 }, |
| 31 | + }; |
| 32 | + |
| 33 | + const value = blackmanKernel(src, 0, 4, 1.5, 0, state); |
| 34 | + expect(Number.isFinite(value)).toBe(true); |
| 35 | + }); |
| 36 | + |
| 37 | + it('uses previous sample values before frame zero', () => { |
| 38 | + const src = new Float32Array([10, 20, 30, 40]); |
| 39 | + const state = { |
| 40 | + prevSampleL: 9, |
| 41 | + prevSampleR: 11, |
| 42 | + params: { radius: 4 }, |
| 43 | + }; |
| 44 | + |
| 45 | + const leftValue = blackmanKernel(src, 0, 2, -0.25, 0, state); |
| 46 | + const rightValue = blackmanKernel(src, 0, 2, -0.25, 1, state); |
| 47 | + |
| 48 | + expect(Number.isFinite(leftValue)).toBe(true); |
| 49 | + expect(Number.isFinite(rightValue)).toBe(true); |
| 50 | + expect(leftValue).toBeGreaterThan(0); |
| 51 | + expect(rightValue).toBeGreaterThan(0); |
| 52 | + }); |
| 53 | + |
| 54 | + it('uses edge sample values beyond available frames', () => { |
| 55 | + const src = new Float32Array([10, 20, 30, 40]); |
| 56 | + const state = { |
| 57 | + prevSampleL: 0, |
| 58 | + prevSampleR: 0, |
| 59 | + params: { radius: 4 }, |
| 60 | + }; |
| 61 | + |
| 62 | + const value = blackmanKernel(src, 0, 2, 20, 1, state); |
| 63 | + expect(value).toBe(40); |
| 64 | + }); |
| 65 | + }); |
| 66 | + |
| 67 | + describe('blackmanStrategy', () => { |
| 68 | + it('normalizes radius and applies params', () => { |
| 69 | + const normalizedLow = blackmanStrategy.normalizeParams?.( |
| 70 | + { radius: 1 }, |
| 71 | + blackmanStrategy.defaultParams ?? {}, |
| 72 | + ); |
| 73 | + const normalizedHigh = blackmanStrategy.normalizeParams?.( |
| 74 | + { radius: 99 }, |
| 75 | + blackmanStrategy.defaultParams ?? {}, |
| 76 | + ); |
| 77 | + const normalizedUndefined = blackmanStrategy.normalizeParams?.( |
| 78 | + undefined, |
| 79 | + {}, |
| 80 | + ); |
| 81 | + |
| 82 | + expect(normalizedLow?.radius).toBe(2); |
| 83 | + expect(normalizedHigh?.radius).toBe(8); |
| 84 | + expect(normalizedUndefined?.radius).toBe(4); |
| 85 | + |
| 86 | + const state = { |
| 87 | + prevSampleL: 0, |
| 88 | + prevSampleR: 0, |
| 89 | + params: { radius: 4 }, |
| 90 | + }; |
| 91 | + blackmanStrategy.applyParams?.(state, { radius: 6 }); |
| 92 | + expect(state.params.radius).toBe(6); |
| 93 | + |
| 94 | + expect(() => |
| 95 | + blackmanStrategy.applyParams?.(null, { radius: 6 }), |
| 96 | + ).not.toThrow(); |
| 97 | + }); |
| 98 | + |
| 99 | + it('registers the strategy through helper', () => { |
| 100 | + const registerInterpolationStrategy = vi.fn(); |
| 101 | + registerBlackmanStrategy({ registerInterpolationStrategy }); |
| 102 | + expect(registerInterpolationStrategy).toHaveBeenCalledWith( |
| 103 | + blackmanStrategy, |
| 104 | + ); |
| 105 | + }); |
| 106 | + }); |
| 107 | +}); |
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