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import type { MigrationResult, ProjectRecord } from "./types";
import { getProjectId, isRecord } from "./utils";
// Frozen snapshots of v18-era volume bounds. See ./README.md.
const VOLUME_DB_MIN = -60;
const VOLUME_DB_MAX = 20;
export function transformProjectV17ToV18({
project,
}: {
project: ProjectRecord;
}): MigrationResult<ProjectRecord> {
if (!getProjectId({ project })) {
return { project, skipped: true, reason: "no project id" };
}
if (typeof project.version === "number" && project.version >= 18) {
return { project, skipped: true, reason: "already v18" };
}
return {
project: {
...migrateElementVolumes({ project }),
version: 18,
},
skipped: false,
};
}
function migrateElementVolumes({
project,
}: {
project: ProjectRecord;
}): ProjectRecord {
const scenesValue = project.scenes;
if (!Array.isArray(scenesValue)) {
return project;
}
const migratedScenes = scenesValue.map((scene) => {
if (!isRecord(scene)) {
return scene;
}
const tracksValue = scene.tracks;
if (!Array.isArray(tracksValue)) {
return scene;
}
const migratedTracks = tracksValue.map((track) => {
if (!isRecord(track)) {
return track;
}
const elementsValue = track.elements;
if (!Array.isArray(elementsValue)) {
return track;
}
const migratedElements = elementsValue.map((element) => {
if (!isRecord(element)) {
return element;
}
if (element.type !== "audio" && element.type !== "video") {
return element;
}
const legacyVolume = element.volume;
return {
...element,
volume:
typeof legacyVolume === "number" ? linearGainToDb(legacyVolume) : 0,
};
});
return {
...track,
elements: migratedElements,
};
});
return {
...scene,
tracks: migratedTracks,
};
});
return {
...project,
scenes: migratedScenes,
};
}
function linearGainToDb(gain: number): number {
if (!Number.isFinite(gain)) {
return 0;
}
if (gain <= 0) {
return VOLUME_DB_MIN;
}
return clampDb(20 * Math.log10(gain));
}
function clampDb(value: number): number {
if (!Number.isFinite(value)) {
return 0;
}
return Math.min(VOLUME_DB_MAX, Math.max(VOLUME_DB_MIN, value));
}
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