wip

hooks/useTrickplay.ts

@@ -0,0 +1,80 @@
+// hooks/useTrickplay.ts
+
+import { useState, useCallback } from "react";
+import { Api } from "@jellyfin/sdk";
+import { SharedValue } from "react-native-reanimated";
+
+interface TrickplayInfo {
+  data: {
+    Interval?: number;
+    TileWidth?: number;
+    TileHeight?: number;
+    Height?: number;
+    Width?: number;
+    ThumbnailCount?: number;
+  };
+  resolution?: string;
+}
+
+interface TrickplayUrl {
+  x: number;
+  y: number;
+  url: string;
+}
+
+export const useTrickplay = () => {
+  const [trickPlayUrl, setTrickPlayUrl] = useState<TrickplayUrl | null>(null);
+
+  const calculateTrickplayUrl = useCallback(
+    (
+      info: TrickplayInfo | null,
+      progress: SharedValue<number>,
+      api: Api | null,
+      id: string
+    ) => {
+      if (!info || !id || !api) {
+        return null;
+      }
+
+      const { data, resolution } = info;
+      const { Interval, TileWidth, TileHeight, Height, Width, ThumbnailCount } =
+        data;
+
+      if (
+        !Interval ||
+        !TileWidth ||
+        !TileHeight ||
+        !Height ||
+        !Width ||
+        !ThumbnailCount ||
+        !resolution
+      ) {
+        throw new Error("Invalid trickplay data");
+      }
+
+      const currentSecond = Math.max(0, Math.floor(progress.value / 10000000));
+
+      const cols = TileWidth;
+      const rows = TileHeight;
+      const imagesPerTile = cols * rows;
+      const imageIndex = Math.floor(currentSecond / (Interval / 1000));
+      const tileIndex = Math.floor(imageIndex / imagesPerTile);
+
+      const positionInTile = imageIndex % imagesPerTile;
+      const rowInTile = Math.floor(positionInTile / cols);
+      const colInTile = positionInTile % cols;
+
+      const newTrickPlayUrl = {
+        x: rowInTile,
+        y: colInTile,
+        url: `${api.basePath}/Videos/${id}/Trickplay/${resolution}/${tileIndex}.jpg?api_key=${api.accessToken}`,
+      };
+
+      setTrickPlayUrl(newTrickPlayUrl);
+      return newTrickPlayUrl;
+    },
+    []
+  );
+
+  return { trickPlayUrl, calculateTrickplayUrl };
+};