50 lines
1.9 KiB
TypeScript
50 lines
1.9 KiB
TypeScript
// 资产到时间线片段的纯转换：只做类型映射和结构组装，不读取网络或修改编辑器状态。
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// 资产是"仅时间线作用域"的直连媒体：nodeId 用 `asset:<id>` 前缀（不指向画布节点），
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// 预览/导出从 directMedia 解析媒体，不回画布查节点。
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import type { ProjectAsset } from "@/services/api/projects";
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import type { TimelineClip, TimelineClipKind } from "@/types/timeline";
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const MEDIA_TYPE_TO_KIND: Record<string, TimelineClipKind | undefined> = {
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video: "video",
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audio: "audio",
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image: "image",
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text: "text",
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};
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export function assetToClipKind(mediaType: string): TimelineClipKind | null {
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return MEDIA_TYPE_TO_KIND[mediaType] ?? null;
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}
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export type MakeClipFromAssetOptions = {
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/** 目标轨道 id（调用方已按 kind 选好轨道）。 */
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trackId: string;
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/** 时间线起点（毫秒，通常为该轨道当前末尾）。 */
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startMs: number;
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/** 默认时长（毫秒）；资产无时长元数据时使用。 */
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defaultDurationMs?: number;
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/** 时间线内唯一 id（调用方负责去重，通常 `asset:<id>:<n>`）。 */
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id?: string;
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};
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export function makeClipFromAsset(asset: ProjectAsset, options: MakeClipFromAssetOptions): TimelineClip | null {
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const kind = assetToClipKind(asset.mediaType);
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if (!kind) return null;
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if (kind === "text") return null; // 文本资产不直接入轨（走字幕/文字工具）
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return {
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id: options.id ?? `asset:${asset.id}`,
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kind,
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nodeId: `asset:${asset.id}`,
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trackId: options.trackId,
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startMs: options.startMs,
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durationMs: asset.durationMs && asset.durationMs > 0 ? asset.durationMs : (options.defaultDurationMs ?? 3_000),
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title: asset.title,
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directMedia: {
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id: asset.id,
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kind: kind === "subtitle" ? "text" : kind,
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title: asset.title,
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storageKey: asset.storageKey,
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},
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};
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}
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