Add new subtitle format - thx Hai-Lag :)

work on #4218

libse/SubtitleFormats/SubtitleFormat.cs

@@ -305,6 +305,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
                     new UnknownSubtitle95(),
                     new UnknownSubtitle96(),
                     new UnknownSubtitle97(),
+                    new UnknownSubtitle98(),
                 };
 
                 string path = Configuration.PluginsDirectory;

libse/SubtitleFormats/UnknownSubtitle98.cs

@@ -0,0 +1,98 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace Nikse.SubtitleEdit.Core.SubtitleFormats
+{
+    public class UnknownSubtitle98 : SubtitleFormat
+    {
+        //7:00:01:27AM
+        private static readonly Regex RegexTimeCodes = new Regex(@"^\d\d\:\d\d\:\d\d\:\d\d\t", RegexOptions.Compiled);
+
+        public override string Extension => ".rtf";
+
+        public override string Name => "Unknown 98";
+
+        public override string ToText(Subtitle subtitle, string title)
+        {
+            var sb = new StringBuilder();
+            foreach (var p in subtitle.Paragraphs)
+            {
+                sb.AppendLine($"{EncodeTimeCode(p.StartTime)}\t{p.Text.Replace(Environment.NewLine, " ")}");
+            }
+            return sb.ToString().Trim().ToRtf();
+        }
+
+        private static string EncodeTimeCode(TimeCode timeCode)
+        {
+            return $"{timeCode.Hours:00}:{timeCode.Minutes:00}:{timeCode.Seconds:00}:{MillisecondsToFramesMaxFrameRate(timeCode.Milliseconds):00}";
+        }
+
+        public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
+        {
+            var sb = new StringBuilder();
+            foreach (string line in lines)
+            {
+                sb.AppendLine(line);
+            }
+
+            var rtf = sb.ToString().Trim();
+            if (!rtf.StartsWith("{\\rtf", StringComparison.Ordinal))
+            {
+                return;
+            }
+
+            lines = rtf.FromRtf().SplitToLines();
+            _errorCount = 0;
+            foreach (string line in lines)
+            {
+                string s = line.Trim();
+                if (RegexTimeCodes.Match(s).Success)
+                {
+                    try
+                    {
+                        var arr = s.Substring(0, 11).Split(':');
+                        if (arr.Length == 4)
+                        {
+                            var p = new Paragraph
+                            {
+                                StartTime = DecodeTimeCodeFramesFourParts(arr),
+                                Text = s.Remove(0, 11).Trim()
+                            };
+                            subtitle.Paragraphs.Add(p);
+                        }
+                    }
+                    catch
+                    {
+                        _errorCount++;
+                    }
+                }
+                else if (s.Length > 0)
+                {
+                    _errorCount++;
+                }
+            }
+
+            int index = 1;
+            var language = LanguageAutoDetect.AutoDetectGoogleLanguage(subtitle);
+            foreach (var paragraph in subtitle.Paragraphs)
+            {
+                paragraph.Text = Utilities.AutoBreakLine(paragraph.Text, language);
+                var next = subtitle.GetParagraphOrDefault(index);
+                if (next != null)
+                {
+                    paragraph.EndTime.TotalMilliseconds = next.StartTime.TotalMilliseconds - 1;
+                }
+                if (paragraph.Duration.TotalMilliseconds > Configuration.Settings.General.SubtitleMaximumDisplayMilliseconds)
+                {
+                    paragraph.EndTime.TotalMilliseconds = paragraph.StartTime.TotalMilliseconds + Utilities.GetOptimalDisplayMilliseconds(paragraph.Text);
+                }
+                index++;
+            }
+
+            subtitle.RemoveEmptyLines();
+            subtitle.Renumber();
+        }
+    }
+}