31 lines
1005 B
TypeScript
31 lines
1005 B
TypeScript
import { describe, expect, it } from "vitest";
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import { rmsDb, upsample24kMonoTo48kStereo } from "../../src/audio/pcm";
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describe("PCM helpers", () => {
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it("upsamples 24kHz mono s16le to 48kHz stereo s16le", () => {
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const input = Buffer.alloc(4);
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input.writeInt16LE(1000, 0);
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input.writeInt16LE(-1000, 2);
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const output = upsample24kMonoTo48kStereo(input);
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expect(output.length).toBe(16);
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expect(output.readInt16LE(0)).toBe(1000);
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expect(output.readInt16LE(2)).toBe(1000);
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expect(output.readInt16LE(4)).toBe(1000);
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expect(output.readInt16LE(6)).toBe(1000);
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expect(output.readInt16LE(8)).toBe(-1000);
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expect(output.readInt16LE(10)).toBe(-1000);
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expect(output.readInt16LE(12)).toBe(-1000);
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expect(output.readInt16LE(14)).toBe(-1000);
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});
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it("calculates RMS dB for non-silent PCM", () => {
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const input = Buffer.alloc(4);
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input.writeInt16LE(32767, 0);
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input.writeInt16LE(32767, 2);
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expect(rmsDb(input)).toBeCloseTo(0, 1);
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});
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});
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