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import { describe, expect, test } from "bun:test";
import {
dBToLinear,
getTrackVolume,
resolveEffectiveAudioGain,
} from "@/timeline/audio-state";
import type { AudioElement, AudioTrack } from "@/timeline";
import { ZERO_MEDIA_TIME } from "@/wasm";
function audioElement(params?: AudioElement["params"]): AudioElement {
return {
id: "audio-1",
name: "Audio",
type: "audio",
sourceType: "upload",
mediaId: "media-1",
duration: ZERO_MEDIA_TIME,
startTime: ZERO_MEDIA_TIME,
trimStart: ZERO_MEDIA_TIME,
trimEnd: ZERO_MEDIA_TIME,
params: params ?? { volume: 0, muted: false },
};
}
describe("audio state", () => {
test("track volume offsets element gain in decibels", () => {
const gain = resolveEffectiveAudioGain({
element: audioElement({ volume: -6, muted: false }),
trackVolume: -6,
localTime: 0,
});
expect(gain).toBeCloseTo(dBToLinear(-12), 6);
});
test("track volume and mute resolve to playback gain", () => {
const element = audioElement({ volume: 0, muted: false });
expect(
resolveEffectiveAudioGain({ element, trackVolume: 0, localTime: 0 }),
).toBe(1);
expect(
resolveEffectiveAudioGain({ element, trackVolume: -6, localTime: 0 }),
).toBeCloseTo(dBToLinear(-6), 6);
expect(
resolveEffectiveAudioGain({
element,
trackMuted: true,
trackVolume: 0,
localTime: 0,
}),
).toBe(0);
});
test("missing track volume defaults to unity", () => {
const track: AudioTrack = {
id: "track-1",
name: "Audio track",
type: "audio",
elements: [],
muted: false,
};
expect(getTrackVolume({ track })).toBe(0);
});
});
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