Add /api/thumbnail/[id]

thumbnail/base.ts

@@ -0,0 +1,22 @@
+import { join } from "std/path/mod.ts";
+import { filterFilename } from "../utils.ts";
+import { EhFile } from "../db.ts";
+
+export type ThumbnailConfig = {
+    width: number;
+    height: number;
+    quality: number;
+};
+
+export function generate_filename(
+    base: string,
+    f: EhFile,
+    cfg: ThumbnailConfig,
+) {
+    return join(
+        base,
+        filterFilename(
+            `${f.id}-${f.token}-${cfg.width}x${cfg.height}-q${cfg.quality}.jpg`,
+        ),
+    );
+}

thumbnail/ffmpeg_binary.ts

@@ -0,0 +1,43 @@
+import { ThumbnailConfig } from "./base.ts";
+
+export async function check_ffmpeg_binary(p: string) {
+    const cmd = new Deno.Command(p, {
+        stdout: "null",
+        stderr: "null",
+        args: ["-h"],
+    });
+    const c = cmd.spawn();
+    const o = await c.output();
+    return o.code === 0;
+}
+
+export async function fb_generate_thumbnail(
+    p: string,
+    i: string,
+    o: string,
+    cfg: ThumbnailConfig,
+) {
+    const args = [
+        "-i",
+        i,
+        "-vf",
+        `scale=${cfg.width}:${cfg.height}`,
+        "-qmin",
+        `${cfg.quality}`,
+        "-qmax",
+        `${cfg.quality}`,
+        o,
+    ];
+    const cmd = new Deno.Command(p, { args, stdout: "null", stderr: "piped" });
+    const c = cmd.spawn();
+    const s = await c.output();
+    if (s.code !== 0) {
+        try {
+            const d = (new TextDecoder()).decode(s.stderr);
+            console.log(d);
+        } catch (_) {
+            console.log(s.stderr);
+        }
+    }
+    return s.code === 0;
+}