FIX: 1) check empty beatmap; 2) escape [ and ] in filename

Author: QingQiz

BmsToOsu/Converter/SampleToMp3.cs

@@ -20,6 +20,8 @@ private class FilterComplex
             (@"\", @"\\\\"),
             (@"=", @"\\\="),
             (@",", @"\,"),
+            (@"[", @"\["),
+            (@"]", @"\]"),
             (@":", @"\\\:"),
             (@"'", @"\\\'")
         };
@@ -151,7 +153,7 @@ public void GenerateMp3(BmsFileData data, string output)
     {
         var allSoundList = data.GetSoundFileList();
 
-        var groupSize = Math.Min(allSoundList.Count / 10, 1300);
+        var groupSize = Math.Max(Math.Min(allSoundList.Count / 10, 1300), 10);
 
         var groupedSoundList = new List<(List<(double StartTime, string SoundFile)> SoundList, string Output)>();
 

BmsToOsu/Entity/BmsFileData.cs

@@ -540,6 +540,12 @@ public static BmsFileData FromFile(string fp)
             startTrackAt += fullLengthOfTrack;
         }
 
+        if (data.HitObject.Values.All(x => !x.Any()) && !data.SoundEffects.Any())
+        {
+            Log.Error($"{fp}: The beatmap has no object, skipping...");
+            throw new InvalidDataException();
+        }
+
         data.BgaFrames.Sort((a, b) => a.StartTime.CompareTo(b.StartTime));
         return data;
     }