34 lines
1.3 KiB
TypeScript
34 lines
1.3 KiB
TypeScript
import { describe, expect, it } from 'vitest'
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import { toWav, toWavFromPCM16 } from './wav'
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describe('toWav', () => {
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it('converts Float32 samples to PCM16 bytes by default', () => {
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const samples = new Float32Array([-1, 0, 1])
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const wav = toWav(samples.buffer, 24000)
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const view = new DataView(wav)
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expect(view.getInt16(44, true)).toBe(-32768)
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expect(view.getInt16(46, true)).toBe(0)
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expect(view.getInt16(48, true)).toBe(32767)
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})
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it('preserves PCM16 bytes and writes the WAV metadata', () => {
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const pcmBytes = new Uint8Array([0x00, 0x80, 0xFF, 0x7F])
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const wav = toWavFromPCM16(pcmBytes, 24000)
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const view = new DataView(wav)
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expect(new TextDecoder().decode(new Uint8Array(wav, 0, 4))).toBe('RIFF')
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expect(view.getUint32(4, true)).toBe(40)
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expect(new TextDecoder().decode(new Uint8Array(wav, 8, 4))).toBe('WAVE')
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expect(view.getUint16(20, true)).toBe(1)
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expect(view.getUint16(22, true)).toBe(1)
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expect(view.getUint32(24, true)).toBe(24000)
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expect(view.getUint32(28, true)).toBe(48000)
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expect(view.getUint16(32, true)).toBe(2)
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expect(view.getUint16(34, true)).toBe(16)
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expect(view.getUint32(40, true)).toBe(pcmBytes.byteLength)
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expect([...new Uint8Array(wav, 44)]).toEqual([...pcmBytes])
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})
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})
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