Move StemMixer _speed variable to BassStemMixer

+ Remove the BassAudioManager.GetSpeed call as we already have the speed saved

Author: sonicfind

Assets/Script/Audio/Bass/BassStemMixer.cs

@@ -16,6 +16,7 @@ public sealed class BassStemMixer : StemMixer
 
         private StreamHandle _mainHandle;
         private int _songEndHandle;
+        private float _speed;
 
         public override event Action SongEnd
         {
@@ -44,10 +45,11 @@ void sync(int _, int __, int ___, IntPtr _____)
         }
 
         internal BassStemMixer(string name, BassAudioManager manager, float speed, double volume, int handle, int sourceStream, bool clampStemVolume)
-            : base(name, manager, speed, clampStemVolume)
+            : base(name, manager, clampStemVolume)
         {
             _mixerHandle = handle;
             _sourceStream = sourceStream;
+            _speed = speed;
             SetVolume_Internal(volume);
             _BufferSetter(Settings.SettingsManager.Settings.EnablePlaybackBuffer.Value, Bass.PlaybackBufferLength);
         }
@@ -107,13 +109,7 @@ protected override double GetPosition_Internal()
 
             if (Settings.SettingsManager.Settings.EnablePlaybackBuffer.Value)
             {
-                if (!BassAudioManager.GetSpeed(_mainHandle.Stream, out var speed))
-                {
-                    YargLogger.LogFormatError("Failed to get channel speed for buffer compensation; assuming a speed of 1.", Bass.LastError);
-                    speed = 1;
-                }
-
-                seconds -= (Bass.PlaybackBufferLength / 1000.0f) * speed;
+                seconds -= (Bass.PlaybackBufferLength / 1000.0f) * _speed;
                 // Gotta do this because ChannelBytes2Seconds() may not be less than the buffer at position 0
                 if (seconds < 0)
                 {