fix: AudioImportTool NPE when run outside Play mode

Replace AudioExtendSettings.Instance with local AssetDatabase-loaded field to avoid nullref when AudioSystem hasn't yet initialized.

Assets/Resources/Audios/music_home.wav.meta

@@ -5,13 +5,13 @@ AudioImporter:
   serializedVersion: 7
   defaultSettings:
     serializedVersion: 2
-    loadType: 0
+    loadType: 2
-    sampleRateSetting: 0
+    sampleRateSetting: 2
     sampleRateOverride: 44100
     compressionFormat: 1
-    quality: 1
+    quality: 0.13
     conversionMode: 0
-    preloadAudioData: 0
+    preloadAudioData: 1
   platformSettingOverrides: {}
   forceToMono: 0
   normalize: 1

Assets/Scripts/OCES/Audio/HandWritten/Editor/AudioImportTool.cs

@@ -9,9 +9,26 @@ namespace OCES.Audio
 
     public static class AudioImportTool
     {
+        static AudioExtendSettings s_settings;
+
+        static AudioExtendSettings Settings
+        {
+            get
+            {
+                if (s_settings == null)
+                {
+                    s_settings = AssetDatabase.LoadAssetAtPath<AudioExtendSettings>(
+                        "Assets/Settings/AudioExtendSettings.asset");
+                    if (s_settings == null)
+                        Debug.LogError("[AudioImportTool] 无法加载 AudioExtendSettings.asset，请确保资产存在于 Assets/Settings/ 目录");
+                }
+                return s_settings;
+            }
+        }
+
         static string ConfigAbsolutePath
         {
-            get { return Path.Combine(Application.dataPath, "Resources", AudioExtendSettings.Instance.audioConfigPath); }
+            get { return Path.Combine(Application.dataPath, "Resources", Settings.audioConfigPath); }
         }
 
         [MenuItem("Tools/OCES/Audio/Apply Audio Import Settings")]
@@ -19,7 +36,7 @@ namespace OCES.Audio
         {
             if (EditorUtility.DisplayDialog(
                     "Apply Audio Import Settings",
-                    $"将对 {AudioExtendSettings.Instance.FullAudioResourcePath} 下所有文件重新应用导入设置，确认继续？",
+                    $"将对 {Settings.FullAudioResourcePath} 下所有文件重新应用导入设置，确认继续？",
                     "确认", "取消"))
             {
                 Run();
@@ -43,10 +60,10 @@ namespace OCES.Audio
         {
             // 1. 加载配置表
             var audioObjectConfig =
-                AudioConfigLoader.Load<AudioObjectConfig>(AudioExtendSettings.Instance.FullAudioConfigPath, 
+                AudioConfigLoader.Load<AudioObjectConfig>(Settings.FullAudioConfigPath, 
                     "AudioObject.bytes");
             var musicSegmentConfig =
-                AudioConfigLoader.Load<MusicSegmentConfig>(AudioExtendSettings.Instance.FullAudioConfigPath,
+                AudioConfigLoader.Load<MusicSegmentConfig>(Settings.FullAudioConfigPath,
                     "MusicSegment.bytes");
             if (audioObjectConfig == null || musicSegmentConfig == null)
             {
@@ -56,7 +73,7 @@ namespace OCES.Audio
 
             // 2. 扫描文件
             List<string> supportedExtensions = new() { ".wav", ".ogg" };
-            DirectoryInfo dir = new(AudioExtendSettings.Instance.FullAudioResourcePath);
+            DirectoryInfo dir = new(Settings.FullAudioResourcePath);
             FileInfo[] files = dir.GetFiles().Where(f => supportedExtensions.Contains(f.Extension.ToLower())).ToArray();
             int total = files.Length, processed = 0, failed = 0;
 
@@ -116,20 +133,20 @@ namespace OCES.Audio
             importer.ClearSampleSettingOverride("iOS");
             
             AudioImporterSampleSettings settings = importer.defaultSampleSettings;
-            settings.compressionFormat = AudioExtendSettings.Instance.compressionFormat;
+            settings.compressionFormat = Settings.compressionFormat;
 
             settings.sampleRateSetting = AudioSampleRateSetting.OverrideSampleRate;
             settings.preloadAudioData = audioObject?.Haptic != 0;
             switch (category)
             {
                 case AudioCategory.Music:
-                    settings.sampleRateOverride = AudioExtendSettings.Instance.musicSampleRate;
+                    settings.sampleRateOverride = Settings.musicSampleRate;
-                    settings.quality = AudioExtendSettings.Instance.musicQuality;
+                    settings.quality = Settings.musicQuality;
                     
-                    if (duration <= AudioExtendSettings.Instance.decompressThreshold)
+                    if (duration <= Settings.decompressThreshold)
                     {
                         settings.loadType = AudioClipLoadType.DecompressOnLoad;
-                    }else if (duration >= AudioExtendSettings.Instance.streamingThreshold)
+                    }else if (duration >= Settings.streamingThreshold)
                     {
                         settings.loadType = AudioClipLoadType.Streaming;
                     }
@@ -141,10 +158,10 @@ namespace OCES.Audio
                 case AudioCategory.Voice:
                 case AudioCategory.SFX:
                 default:
-                    settings.sampleRateOverride = AudioExtendSettings.Instance.sfxSampleRate; // 音效2022.3.62f3没有32kHz这一档，要是有的话这一档其实最合适
+                    settings.sampleRateOverride = Settings.sfxSampleRate; // 音效2022.3.62f3没有32kHz这一档，要是有的话这一档其实最合适
-                    settings.quality = AudioExtendSettings.Instance.sfxQuality;
+                    settings.quality = Settings.sfxQuality;
 
-                    settings.loadType = duration >= AudioExtendSettings.Instance.streamingThreshold
+                    settings.loadType = duration >= Settings.streamingThreshold
                         ? AudioClipLoadType.Streaming
                         : AudioClipLoadType.DecompressOnLoad;
                     break;