Xiaohan-Tian
37 lines
1.5 KiB
TypeScript
37 lines
1.5 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import {
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getSpectrogramPitchBinCount,
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getSpectrogramVisibleBinRange,
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mapMidiPitchToSpectrogramPosition,
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normalizeSpectrogramHeightResolution,
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} from './spectrogramUtil';
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describe('spectrogramUtil', () => {
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it('normalizes unsupported resolutions to the default 3x', () => {
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expect(normalizeSpectrogramHeightResolution(1)).toBe(1);
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expect(normalizeSpectrogramHeightResolution(3)).toBe(3);
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expect(normalizeSpectrogramHeightResolution(5)).toBe(5);
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expect(normalizeSpectrogramHeightResolution(2)).toBe(3);
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expect(normalizeSpectrogramHeightResolution(undefined)).toBe(3);
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});
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it('derives pitch bin counts from the full MIDI range', () => {
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expect(getSpectrogramPitchBinCount(1)).toBe(128);
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expect(getSpectrogramPitchBinCount(3)).toBe(384);
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expect(getSpectrogramPitchBinCount(5)).toBe(640);
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});
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it('maps MIDI pitches into full-range spectrogram positions', () => {
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expect(mapMidiPitchToSpectrogramPosition(0, 1)).toBe(0);
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expect(mapMidiPitchToSpectrogramPosition(12.5, 3)).toBe(38.5);
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expect(mapMidiPitchToSpectrogramPosition(127, 5)).toBe(637);
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expect(mapMidiPitchToSpectrogramPosition(-1, 3)).toBeNull();
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expect(mapMidiPitchToSpectrogramPosition(128, 3)).toBeNull();
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});
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it('derives the visible C0-B7 subrange inside the full-resolution buffer', () => {
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expect(getSpectrogramVisibleBinRange(1)).toEqual({ start: 12, end: 108 });
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expect(getSpectrogramVisibleBinRange(3)).toEqual({ start: 36, end: 324 });
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});
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});
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