fix: 尝试修复那 0.0333 秒的延迟

Author: clansty

MaiChartManager/Controllers/Charts/ImportChartController.cs

@@ -366,6 +366,8 @@ public ImportChartResult ImportChart([FromForm] int id, IFormFile file, [FromFor
         }
 
         float.TryParse(maiData.GetValueOrDefault("first"), out var first);
+        // Mai 的歌曲是从两帧后开始播放的
+        first -= 1 / 30f;
 
         var paddings = allCharts.Values.Select(chart => Converter.CalcMusicPadding(chart.simaiSharpChart, first)).ToList();
         // 音频前面被增加了多少

MaiChartManager/Controllers/Music/MusicTransferController.cs

@@ -316,7 +316,7 @@ public async Task ExportAsMaidata(int id, string assetDir, bool ignoreVideo = fa
         simaiFile.AppendLine($"&title={music.Name}");
         simaiFile.AppendLine($"&artist={music.Artist}");
         simaiFile.AppendLine($"&wholebpm={music.Bpm}");
-        simaiFile.AppendLine("&first=0");
+        simaiFile.AppendLine("&first=0.0333");
         simaiFile.AppendLine($"&shortid={music.Id}");
         simaiFile.AppendLine($"&genreid={music.GenreId}");
         var genre = StaticSettings.GenreList.FirstOrDefault(it => it.Id == music.GenreId);
@@ -357,7 +357,7 @@ public async Task ExportAsMaidata(int id, string assetDir, bool ignoreVideo = fa
         soundStream.Close();
 
         // copy jacket
-        var img = ImageConvert.GetMusicJacketPngData(music);
+        var img = music.GetMusicJacketPngData();
         if (img is not null)
         {
             var imgExt = (Path.GetExtension(music.JacketPath ?? music.PseudoAssetBundleJacket ?? music.AssetBundleJacket) ?? ".png").ToLowerInvariant();