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import type { SceneTracks, TimelineElement, VideoTrack } from "@/timeline";
import { type MediaTime, ZERO_MEDIA_TIME } from "@/wasm";
export const MAIN_TRACK_NAME = "Main Track";
export function getEarliestMainTrackElement({
mainTrack,
excludeElementId,
}: {
mainTrack: VideoTrack;
excludeElementId?: string;
}): TimelineElement | null {
const elements = mainTrack.elements.filter((element) => {
return !excludeElementId || element.id !== excludeElementId;
});
if (elements.length === 0) {
return null;
}
return elements.reduce((earliestElement, element) => {
return element.startTime < earliestElement.startTime
? element
: earliestElement;
});
}
export function enforceMainTrackStart({
tracks,
targetTrackId,
requestedStartTime,
excludeElementId,
}: {
tracks: SceneTracks;
targetTrackId: string;
requestedStartTime: MediaTime;
excludeElementId?: string;
}): MediaTime {
if (tracks.main.id !== targetTrackId) {
return requestedStartTime;
}
const earliestElement = getEarliestMainTrackElement({
mainTrack: tracks.main,
excludeElementId,
});
if (!earliestElement) {
return ZERO_MEDIA_TIME;
}
if (requestedStartTime <= earliestElement.startTime) {
return ZERO_MEDIA_TIME;
}
return requestedStartTime;
}
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