From 318a1e21c2bdca75b64d69093ee091ded0083b8c Mon Sep 17 00:00:00 2001
From: Sine Striker <trueful@163.com>
Date: Fri, 7 Jun 2024 20:50:52 +0800
Subject: [PATCH] SDL: Use last sample position as current position

---
 TuneLab/Audio/SDL2/SDLAudioEngine.cs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/TuneLab/Audio/SDL2/SDLAudioEngine.cs b/TuneLab/Audio/SDL2/SDLAudioEngine.cs
index 280f535..668b2c9 100644
--- a/TuneLab/Audio/SDL2/SDLAudioEngine.cs
+++ b/TuneLab/Audio/SDL2/SDLAudioEngine.cs
@@ -17,7 +17,7 @@ internal class SDLAudioEngine : IAudioEngine
 
     public int SamplingRate => 44100;
 
-    public double CurrentTime => (double)_realPosition / SamplingRate;
+    public double CurrentTime => (double)_lastPosition / SamplingRate;
 
     public void Init(IAudioProcessor processor)
     {
@@ -60,7 +60,6 @@ public void Init(IAudioProcessor processor)
             {
                 context.Post(_ =>
                 {
-                    _realPosition += val / 2;
                     if (IsPlaying)
                     {
                         ProgressChanged?.Invoke();
@@ -130,7 +129,7 @@ public void Pause()
     public void Seek(double time)
     {
         _position = (int)(time * SamplingRate);
-        _realPosition = _position;
+        _lastPosition = _position;
     }
 
     // 获取所有音频设备
@@ -202,7 +201,7 @@ public void SwitchDriver(string driver)
     // 成员变量
     private IAudioProcessor? _audioProcessor;
     private int _position = 0;
-    private int _realPosition = 0;
+    private int _lastPosition = 0;
 
     // SDL 相关
     private SDLPlaybackData _d;
@@ -216,6 +215,7 @@ public int Read(float[] buffer, int offset, int count)
             int position = engine._position;
             int length = count / 2;
 
+            engine._lastPosition = position;
             engine._position += length;
 
             for (int i = offset; i < offset + count; i++)