Add ffprobe-worker.

www/public/ffprobe-worker.js

@@ -0,0 +1,36 @@
+onmessage = (e) => {
+    const file = e.data[0];
+
+    // Mount FS for files.
+    if (!FS.analyzePath('/work').exists) {
+        FS.mkdir('/work');
+    }
+    FS.mount(WORKERFS, { files: [file] }, '/work');
+
+    // Call the wasm module.
+    const info = Module.get_file_info('/work/' + file.name);
+
+    // Remap streams into collection.
+    const s = [];
+    for (let i = 0; i < info.streams.size(); i++) {
+        s.push(info.streams.get(i));
+    }
+
+    const versions = {
+        libavutil:  Module.avutil_version(),
+        libavcodec:  Module.avcodec_version(),
+        libavformat:  Module.avformat_version(),
+    };
+
+    // Send back data response.
+    const data = {
+        ...info,
+        streams: s,
+        versions,
+    }
+    postMessage(data);
+
+    // Cleanup mount.
+    FS.unmount('/work');
+}
+self.importScripts('ffprobe-wasm.js'); // Load ffprobe into worker context.