initial support for download tracks

audio Quality increased

lib/components/DownloadTrackButton.dart

@@ -0,0 +1,63 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:spotify/spotify.dart';
+import 'package:spotube/helpers/artist-to-string.dart';
+import 'package:youtube_explode_dart/youtube_explode_dart.dart';
+import 'package:path_provider/path_provider.dart' as path_provider;
+import 'package:path/path.dart' as path;
+
+class DownloadTrackButton extends StatefulWidget {
+  final Track? track;
+  const DownloadTrackButton({Key? key, this.track}) : super(key: key);
+
+  @override
+  _DownloadTrackButtonState createState() => _DownloadTrackButtonState();
+}
+
+class _DownloadTrackButtonState extends State<DownloadTrackButton> {
+  late YoutubeExplode yt;
+
+  @override
+  void initState() {
+    yt = YoutubeExplode();
+    super.initState();
+  }
+
+  @override
+  void dispose() {
+    yt.close();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return IconButton(
+      icon: const Icon(Icons.download_rounded),
+      onPressed: widget.track != null
+          ? () async {
+              if (widget.track == null) return;
+              StreamManifest manifest = await yt.videos.streamsClient
+                  .getManifest(widget.track?.href!.split("watch?v=").last);
+
+              var audioStream = yt.videos.streamsClient
+                  .get(manifest.audioOnly.withHighestBitrate());
+
+              String downloadFolder = path.join(
+                  (await path_provider.getDownloadsDirectory())!.path,
+                  "Spotube");
+              String fileName =
+                  "${widget.track?.name} - ${artistsToString(widget.track?.artists ?? [])}.mp3";
+              File outputFile = File(path.join(downloadFolder, fileName));
+              if (!outputFile.existsSync()) {
+                outputFile.createSync(recursive: true);
+                IOSink outputFileStream = outputFile.openWrite();
+                await audioStream.pipe(outputFileStream);
+                await outputFileStream.flush();
+                await outputFileStream.close();
+              }
+            }
+          : null,
+    );
+  }
+}

lib/components/Player.dart

@@ -5,6 +5,7 @@ import 'package:cached_network_image/cached_network_image.dart';
 import 'package:hotkey_manager/hotkey_manager.dart';
 import 'package:just_audio/just_audio.dart';
 import 'package:spotify/spotify.dart';
+import 'package:spotube/components/DownloadTrackButton.dart';
 import 'package:spotube/components/PlayerControls.dart';
 import 'package:spotube/helpers/artist-to-string.dart';
 import 'package:spotube/helpers/search-youtube.dart';
@@ -354,6 +355,9 @@ class _PlayerState extends State<Player> with WidgetsBindingObserver {
                     },
                   ),
                 ),
+                DownloadTrackButton(
+                  track: playback.currentTrack,
+                ),
                 // add to saved tracks
                 Expanded(
                   flex: 1,

lib/helpers/search-youtube.dart

@@ -19,6 +19,7 @@ Future<Track> toYoutubeTrack(Track track) async {
 
   var trackManifest = await youtube.videos.streams.getManifest(ytVideo.id);
 
-  track.uri = trackManifest.audioOnly.first.url.toString();
+  track.uri = trackManifest.audioOnly.withHighestBitrate().url.toString();
+  track.href = ytVideo.url;
   return track;
 }

pubspec.lock

@@ -367,14 +367,14 @@ packages:
     source: hosted
     version: "2.0.2"
   path:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
   path_provider:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path_provider
       url: "https://pub.dartlang.org"

pubspec.yaml

@@ -47,6 +47,8 @@ dependencies:
   hotkey_manager: ^0.1.6
   just_audio: ^0.9.18
   just_audio_libwinmedia: ^0.0.4
+  path: ^1.8.0
+  path_provider: ^2.0.8
 
 dev_dependencies:
   flutter_test: