add a "Use Vorbis" switch

lib/components/TranscodingSettingsScreen/VorbisSwitch.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+import 'package:hive/hive.dart';
+
+import '../../services/FinampSettingsHelper.dart';
+import '../../models/FinampModels.dart';
+
+class VorbisSwitch extends StatelessWidget {
+  const VorbisSwitch({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return ValueListenableBuilder<Box<FinampSettings>>(
+      valueListenable: FinampSettingsHelper.finampSettingsListener,
+      builder: (context, box, child) {
+        bool? useVorbis = box.get("FinampSettings")?.useVorbis;
+
+        return SwitchListTile(
+          title: const Text("Use Vorbis Codec"),
+          subtitle: const Text(
+              "If enabled, music streams will be transcoded to Vorbis and not AAC by the server."),
+          value: useVorbis ?? false,
+          onChanged: useVorbis == null
+              ? null
+              : (value) {
+                  FinampSettings finampSettingsTemp =
+                      box.get("FinampSettings")!;
+                  finampSettingsTemp.useVorbis = value;
+                  box.put("FinampSettings", finampSettingsTemp);
+                },
+        );
+      },
+    );
+  }
+}

lib/models/FinampModels.dart

@@ -44,6 +44,7 @@ const _contentGridViewCrossAxisCountPortrait = 2;
 const _contentGridViewCrossAxisCountLandscape = 3;
 const _showTextOnGridView = true;
 const _sleepTimerSeconds = 1800; // 30 Minutes
+const _useVorbis = false;
 
 @HiveType(typeId: 28)
 class FinampSettings {
@@ -68,6 +69,7 @@ class FinampSettings {
         _contentGridViewCrossAxisCountLandscape,
     this.showTextOnGridView = _showTextOnGridView,
     this.sleepTimerSeconds = _sleepTimerSeconds,
+    this.useVorbis = _useVorbis,
   });
 
   @HiveField(0)
@@ -123,6 +125,11 @@ class FinampSettings {
   @HiveField(14, defaultValue: _sleepTimerSeconds)
   int sleepTimerSeconds;
 
+  /// Whether or not to request Vorbis as the transcoding codec.
+  /// If false, AAC will be used.
+  @HiveField(15, defaultValue: _useVorbis)
+  bool useVorbis;
+
   static Future<FinampSettings> create() async {
     Directory internalSongDir = await getInternalSongDir();
     return FinampSettings(

lib/screens/TranscodingSettingsScreen.dart

@@ -1,7 +1,10 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 
 import '../components/TranscodingSettingsScreen/TranscodeSwitch.dart';
 import '../components/TranscodingSettingsScreen/BitrateSelector.dart';
+import '../components/TranscodingSettingsScreen/VorbisSwitch.dart';
 
 class TranscodingSettingsScreen extends StatelessWidget {
   const TranscodingSettingsScreen({Key? key}) : super(key: key);
@@ -17,14 +20,7 @@ class TranscodingSettingsScreen extends StatelessWidget {
           children: [
             const TranscodeSwitch(),
             const BitrateSelector(),
-            Padding(
-              padding: const EdgeInsets.all(8.0),
-              child: Text(
-                "Jellyfin uses AAC for transcoding.",
-                style: Theme.of(context).textTheme.caption,
-                textAlign: TextAlign.center,
-              ),
-            ),
+            if (!(Platform.isIOS || Platform.isMacOS)) const VorbisSwitch(),
           ],
         ),
       ),

lib/services/AudioServiceHelper.dart

@@ -234,6 +234,7 @@ class AudioServiceHelper {
         "shouldTranscode": FinampSettingsHelper.finampSettings.shouldTranscode,
         "downloadedSongJson": (await _getDownloadedSong(item.id))?.toJson(),
         "isOffline": FinampSettingsHelper.finampSettings.isOffline,
+        "useVorbis": FinampSettingsHelper.finampSettings.useVorbis,
         // TODO: Maybe add transcoding bitrate here?
       },
       rating: Rating.newHeartRating(item.userData?.isFavorite ?? false),

lib/services/MusicPlayerBackgroundTask.dart

@@ -473,7 +473,8 @@ class MusicPlayerBackgroundTask extends BaseAudioHandler {
         return Future.error(
             "Offline mode enabled but downloaded song not found.");
       } else {
-        if (mediaItem.extras!["shouldTranscode"] == true) {
+        if (mediaItem.extras!["shouldTranscode"] == true &&
+            mediaItem.extras!["useVorbis"] == false) {
           return HlsAudioSource(await _songUri(mediaItem));
         } else {
           return AudioSource.uri(await _songUri(mediaItem));
@@ -524,10 +525,10 @@ class MusicPlayerBackgroundTask extends BaseAudioHandler {
         "MaxStreamingBitrate": mediaItem.extras!["shouldTranscode"]
             ? FinampSettingsHelper.finampSettings.transcodeBitrate.toString()
             : "999999999",
-        "AudioCodec": "aac",
+        "AudioCodec": mediaItem.extras!["useVorbis"] ? "vorbis" : "aac",
         "TranscodingContainer": "ts",
         "TranscodingProtocol":
-            mediaItem.extras!["shouldTranscode"] ? "hls" : "http",
+            mediaItem.extras!["shouldTranscode"] ? (mediaItem.extras!["useVorbis"] ? "http" : "hls") : "http",
         "ApiKey": _jellyfinApiData.currentUser!.accessToken,
       },
     );