Add configurable global audio offset, useful for Bluetooth headsets

MuzikaGromche/Plugin.cs

@@ -198,6 +198,8 @@ namespace MuzikaGromche
                 // [2] Start source has finished
                 : loop.time + FixedLoopDelay;
 
+            elapsed -= Config.AudioOffset.Value;
+
             var normalized = Mod.Positive(elapsed / LoadedLoop.length, 1f);
 
             var beat = normalized * (float)Beats;
@@ -346,10 +348,17 @@ namespace MuzikaGromche
 
     public class Config : SyncedConfig2<Config>
     {
+        public static ConfigEntry<float> AudioOffset { get; private set; }
+
         public static bool ShouldSkipWindingPhase { get; private set; } = false;
 
         public Config(ConfigFile configFile) : base(PluginInfo.PLUGIN_GUID)
         {
+            AudioOffset = configFile.Bind("General", "Audio Offset", 0f, new ConfigDescription(
+                "Adjust audio offset (in seconds).\n\nIf you are playing with Bluetooth headphones and experiencing a visual desync, try setting this to about negative 0.2.\n\nIf your video output has high latency (like a long HDMI cable etc.), try positive values instead.",
+                new AcceptableValueRange<float>(-0.5f, 0.5f)));
+            LethalConfigManager.AddConfigItem(new FloatSliderConfigItem(AudioOffset, requiresRestart: false));
+
 #if DEBUG
             SetupEntriesToSkipWinding(configFile);
 #endif