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scripts/nodejs/publish_cover_adapt.js

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+"use strict";
+
+/**
+ * 发布前封面适配（对齐 Electron CoverAdapter / PLATFORM_REQUIREMENTS.douyin）
+ */
+const fs = require("fs");
+const path = require("path");
+const os = require("os");
+const { spawnSync } = require("child_process");
+const pipelineNative = require("./pipeline_native.js");
+
+const PLATFORM_COVER = {
+  douyin: { width: 1080, height: 1920, format: "jpg" },
+};
+
+function ensurePublishCoverDir() {
+  const dir = path.join(os.tmpdir(), "aiclient-publish-cover");
+  fs.mkdirSync(dir, { recursive: true });
+  return dir;
+}
+
+/**
+ * @param {string} coverPath
+ * @param {'douyin'|'kuaishou'|'shipin'|'xiaohongshu'} [platform]
+ * @returns {string}
+ */
+function adaptCoverForPublish(coverPath, platform = "douyin") {
+  const req = PLATFORM_COVER[platform];
+  if (!req) return coverPath;
+  if (!fs.existsSync(coverPath)) {
+    throw new Error(`封面文件不存在: ${coverPath}`);
+  }
+
+  const ffmpeg = pipelineNative.locateFfmpeg();
+  if (!ffmpeg) {
+    console.warn("[publish_cover_adapt] 未找到 ffmpeg，使用原始封面");
+    return coverPath;
+  }
+
+  const outPath = path.join(
+    ensurePublishCoverDir(),
+    `${platform}_${Date.now()}.jpg`,
+  );
+  const { width, height } = req;
+  const vf = `scale=${width}:${height}:force_original_aspect_ratio=decrease,pad=${width}:${height}:(ow-iw)/2:(oh-ih)/2:black`;
+
+  const r = spawnSync(
+    ffmpeg,
+    ["-y", "-i", coverPath, "-vf", vf, "-q:v", "2", outPath],
+    { encoding: "utf8", windowsHide: true },
+  );
+
+  if (r.status !== 0 || !fs.existsSync(outPath)) {
+    console.warn(
+      "[publish_cover_adapt] ffmpeg 适配失败，使用原始封面:",
+      (r.stderr || "").slice(0, 200),
+    );
+    return coverPath;
+  }
+
+  return outPath;
+}
+
+module.exports = { adaptCoverForPublish, PLATFORM_COVER };