Added audio speed functionality

Author: TheObviousChico

lib/providers/podcast_provider.dart

@@ -63,6 +63,10 @@ class PodcastProvider with ChangeNotifier {
 
   late String? currentPodcastTimeRemaining;
 
+  String audioSpeedButtonLabel = '1.0x';
+
+  List<String> audioSpeedOptions = ['0.5x', '1.0x', '1.5x', '2.0x'];
+
   Future<void> initial(
     BuildContext context,
   ) async {
@@ -220,6 +224,14 @@ class PodcastProvider with ChangeNotifier {
     }
   }
 
+  void audioSpeedButtonClicked() {
+    int index = audioSpeedOptions.indexOf(audioSpeedButtonLabel);
+    int newIndex = (index + 1) % audioSpeedOptions.length;
+    audioSpeedButtonLabel = audioSpeedOptions[newIndex];
+    player.setPlaybackRate(double.parse(audioSpeedButtonLabel.substring(0, 3)));
+    notifyListeners();
+  }
+
   void updatePlaybackBar() {
     // player.getDuration().then((Duration? value) {
     //   podcastDuration = value;

lib/views/player/main_player.dart

@@ -178,11 +178,14 @@ class MainPlayer extends ConsumerWidget {
               child: Row(
                 mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                 children: [
+                  // Playback speed
                   TextButton(
-                    onPressed: () {},
-                    child: const Text(
-                      '1.0x',
-                      style: TextStyle(
+                    onPressed: () => ref
+                        .read(podcastProvider.notifier)
+                        .audioSpeedButtonClicked(),
+                    child: Text(
+                      ref.watch(podcastProvider).audioSpeedButtonLabel,
+                      style: const TextStyle(
                         fontWeight: FontWeight.bold,
                       ),
                     ),