1 files changed, 49 insertions, 0 deletions
diff --git a/ui/client-scripts/src/player/download.ts b/ui/client-scripts/src/player/download.ts
new file mode 100644
index 0000000..1c42bad
--- /dev/null
+++ b/ui/client-scripts/src/player/download.ts
@@ -0,0 +1,49 @@
+/*
+    This file is part of jellything (https://codeberg.org/metamuffin/jellything)
+    which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
+    Copyright (C) 2026 metamuffin <metamuffin.org>
+*/
+/// <reference lib="dom" />
+import { OVar } from "../jshelper/mod.ts";
+
+interface Measurement { time: number, duration: number, size: number }
+export class SegmentDownloader {
+    private measurements: Measurement[] = []
+
+    public bandwidth_avail = new OVar(Infinity)
+    public bandwidth_used = new OVar(Infinity)
+    public total_downloaded = new OVar(0)
+
+    constructor() { }
+
+    async download(url: string): Promise<ArrayBuffer> {
+        const dl_start = performance.now();
+        const res = await fetch(url)
+        const dl_header = performance.now();
+        if (!res.ok) throw new Error("aaaaaa");
+        const buf = await res.arrayBuffer()
+        const dl_body = performance.now();
+
+        this.total_downloaded.value += buf.byteLength
+        if (buf.byteLength > 100 * 1000) {
+            const m = {
+                time: dl_start,
+                duration: (dl_body - dl_header) / 1000,
+                size: buf.byteLength
+            }
+            this.measurements.push(m)
+            this.update_bandwidth()
+        }
+        return buf;
+    }
+
+    update_bandwidth() {
+        while (this.measurements.length > 32)
+            this.measurements.splice(0, 1)
+        const total_elapsed = (performance.now() - this.measurements.reduce((a, v) => Math.min(a, v.time), 0)) / 1000;
+        const total_size = this.measurements.reduce((a, v) => v.size + a, 0)
+        const total_duration = this.measurements.reduce((a, v) => v.duration + a, 0)
+        this.bandwidth_avail.value = total_size / total_duration
+        this.bandwidth_used.value = total_size / total_elapsed
+    }
+}