Add audio format option to download form and update API for audio downloads

src/components/DownloadForm.astro

@@ -38,6 +38,7 @@ const streamOnly = import.meta.env.STREAM_ONLY === "true";
         <option value="mp4" selected
           >{t(Astro, "downloadForm.formatMp4")}</option
         >
+        <option value="audio">{t(Astro, "downloadForm.formatAudio")}</option>
         <option value="best">{t(Astro, "downloadForm.formatBest")}</option>
       </select>
     </div>

src/i18n/de.json

@@ -20,6 +20,7 @@
     "urlPlaceholder": "https://www.youtube.com/watch?v=...",
     "formatLabel": "Format",
     "formatMp4": "MP4 (empfohlen - beste Kompatibilität)",
+    "formatAudio": "Nur Audio (MP3/M4A)",
     "formatBest": "Bestes verfügbares Format",
     "downloadInProgress": "Download läuft...",
     "downloadSuccessful": "Download erfolgreich!",

src/i18n/en.json

@@ -20,6 +20,7 @@
     "urlPlaceholder": "https://www.youtube.com/watch?v=...",
     "formatLabel": "Format",
     "formatMp4": "MP4 (recommended - best compatibility)",
+    "formatAudio": "Audio only (MP3/M4A)",
     "formatBest": "Best available format",
     "downloadInProgress": "Download in progress...",
     "downloadSuccessful": "Download successful!",

src/pages/api/download.ts

@@ -1,7 +1,7 @@
 import type { APIRoute } from "astro";
 import { getSession, isLoginEnabled } from "../../lib/session";
 import { tApi } from "../../lib/i18n";
-import { mkdir, unlink, readFile } from "node:fs/promises";
+import { mkdir, unlink, readFile, readdir } from "node:fs/promises";
 import { existsSync } from "node:fs";
 import path from "node:path";
 import { tmpdir } from "node:os";
@@ -59,13 +59,24 @@ export const POST: APIRoute = async ({ request }) => {
     // Zuerst Video-Informationen abrufen, um den Dateinamen zu erhalten
     const videoInfo = await ytDlpWrap.getVideoInfo(url);
     const title = videoInfo.title || "Video";
-    const ext = format === "mp4" ? "mp4" : videoInfo.ext || "mp4";
+
+    // Dateiendung bestimmen
+    let ext = "mp4";
+    if (format === "audio") {
+      ext = "mp3"; // yt-dlp wird zu MP3 konvertieren
+    } else if (format === "mp4") {
+      ext = "mp4";
+    } else {
+      ext = videoInfo.ext || "mp4";
+    }
     const filename = `${title}.${ext}`;
 
     // Format-String für yt-dlp
     const formatString =
       format === "mp4"
         ? "bestvideo[ext=mp4]+bestaudio[ext=m4a]/bestvideo[ext=mp4]+bestaudio/best[ext=mp4]/best"
+        : format === "audio"
+        ? "bestaudio[ext=m4a]/bestaudio[ext=mp3]/bestaudio"
         : "best";
 
     if (streamOnly) {
@@ -88,6 +99,9 @@ export const POST: APIRoute = async ({ request }) => {
 
           if (format === "mp4") {
             execArgs.push("--merge-output-format", "mp4");
+          } else if (format === "audio") {
+            // Für Audio: Konvertiere zu MP3
+            execArgs.push("--extract-audio", "--audio-format", "mp3");
           }
 
           ytDlpWrap
@@ -113,11 +127,17 @@ export const POST: APIRoute = async ({ request }) => {
         });
 
         // Stream als Response zurückgeben
+        let contentType = "application/octet-stream";
+        if (format === "mp4") {
+          contentType = "video/mp4";
+        } else if (format === "audio") {
+          contentType = "audio/mpeg"; // MP3
+        }
+
         return new Response(fileBuffer, {
           status: 200,
           headers: {
-            "Content-Type":
-              format === "mp4" ? "video/mp4" : "application/octet-stream",
+            "Content-Type": contentType,
             "Content-Disposition": `attachment; filename="${encodeURIComponent(
               filename
             )}"`,
@@ -172,6 +192,9 @@ export const POST: APIRoute = async ({ request }) => {
 
         if (format === "mp4") {
           execArgs.push("--merge-output-format", "mp4");
+        } else if (format === "audio") {
+          // Für Audio: Konvertiere zu MP3
+          execArgs.push("--extract-audio", "--audio-format", "mp3");
         }
 
         ytDlpWrap
@@ -197,10 +220,21 @@ export const POST: APIRoute = async ({ request }) => {
       });
 
       // Dateiname aus dem tatsächlichen Output-Pfad extrahieren
-      const actualFilename = path.join(downloadDir, `${title}.${ext}`);
+      // Für Audio: yt-dlp erstellt .mp3 Datei
+      const actualExt = format === "audio" ? "mp3" : ext;
+      const actualFilename = path.join(downloadDir, `${title}.${actualExt}`);
       let finalFilename = filename;
       if (existsSync(actualFilename)) {
         finalFilename = path.basename(actualFilename);
+      } else if (format === "audio") {
+        // Fallback: Suche nach .mp3 Datei mit möglicherweise anderem Namen
+        const files = await readdir(downloadDir);
+        const mp3File = files.find(
+          (f: string) => f.endsWith(".mp3") && f.includes(title)
+        );
+        if (mp3File) {
+          finalFilename = mp3File;
+        }
       }
 
       return new Response(