feat: 智能选择非黑色视频封面帧

main.js

@@ -3790,6 +3790,71 @@ var fillAudioPreviewArtwork = (app, file, cover) => {
     img.alt = file.name;
   });
 };
+var waitForSeek = (video, time) => new Promise((resolve) => {
+  const onSeeked = () => {
+    video.removeEventListener("seeked", onSeeked);
+    resolve();
+  };
+  video.addEventListener("seeked", onSeeked, { once: true });
+  try {
+    video.currentTime = time;
+  } catch (error) {
+    video.removeEventListener("seeked", onSeeked);
+    resolve();
+  }
+});
+var isCanvasFrameMostlyBlack = (ctx, width, height) => {
+  const sampleWidth = Math.max(8, Math.min(64, width));
+  const sampleHeight = Math.max(8, Math.min(64, height));
+  const imageData = ctx.getImageData(0, 0, sampleWidth, sampleHeight).data;
+  let brightPixels = 0;
+  let totalPixels = 0;
+  for (let i = 0; i < imageData.length; i += 4) {
+    const luminance = imageData[i] * 0.2126 + imageData[i + 1] * 0.7152 + imageData[i + 2] * 0.0722;
+    if (luminance >= 20)
+      brightPixels++;
+    totalPixels++;
+  }
+  if (!totalPixels)
+    return true;
+  return brightPixels / totalPixels < 0.02;
+};
+var pickNonBlackVideoCoverTime = (video) => __async(null, null, function* () {
+  const duration = Number.isFinite(video.duration) ? video.duration : 0;
+  if (duration <= 0.1)
+    return 0;
+  const canvas = document.createElement("canvas");
+  canvas.width = 64;
+  canvas.height = 64;
+  const ctx = canvas.getContext("2d", { willReadFrequently: true });
+  if (!ctx)
+    return 0;
+  const checkpoints = [
+    0.02,
+    0.06,
+    0.12,
+    0.2,
+    0.35,
+    0.5,
+    0.7,
+    0.85
+  ];
+  const tried = /* @__PURE__ */ new Set();
+  for (const ratio of checkpoints) {
+    const target = Math.min(Math.max(duration * ratio, 0), Math.max(duration - 0.05, 0));
+    const bucket = Math.round(target * 100);
+    if (tried.has(bucket))
+      continue;
+    tried.add(bucket);
+    yield waitForSeek(video, target);
+    if (video.readyState < 2)
+      continue;
+    ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
+    if (!isCanvasFrameMostlyBlack(ctx, canvas.width, canvas.height))
+      return target;
+  }
+  return 0;
+});
 var appendAudioPreview = (app, figure, file, settings) => {
   figure.addClass("img-gallery-audio-item");
   const audioCard = figure.createEl("div", { cls: "img-gallery-audio-card" });
@@ -3821,13 +3886,32 @@ var appendPreviewMedia = (app, figure, file, settings) => {
       "object-position": "center center",
       display: "block"
     });
+    let coverTime = 0;
+    let coverInitialized = false;
+    const ensureVideoCover = () => __async(null, null, function* () {
+      if (coverInitialized)
+        return;
+      coverInitialized = true;
+      video.pause();
+      const pickedTime = yield pickNonBlackVideoCoverTime(video);
+      coverTime = Number.isFinite(pickedTime) ? pickedTime : 0;
+      yield waitForSeek(video, coverTime);
+      video.pause();
+    });
+    video.addEventListener("loadedmetadata", () => {
+      void ensureVideoCover();
+    }, { once: true });
     video.addEventListener("mouseenter", () => {
       void video.play().catch(() => {
       });
     });
     video.addEventListener("mouseleave", () => {
       video.pause();
-      video.currentTime = 0;
+      if (coverInitialized) {
+        void waitForSeek(video, coverTime);
+      } else {
+        video.currentTime = 0;
+      }
     });
     return video;
   }

versions.json

@@ -2,5 +2,6 @@
   "1.0.0": "0.14.6",
   "1.1.0": "1.1.8",
   "1.1.1": "1.1.8",
-  "2.0.0": "1.1.8"
+  "2.0.0": "1.1.8",
+  "2.0.1": "2.0.1"
 }