From 723160beb351f429211dcda17463ad89632c00f6 Mon Sep 17 00:00:00 2001
From: Nikolaj Olsson <nikse.dk@gmail.com>
Date: Thu, 14 Mar 2024 12:55:46 +0100
Subject: [PATCH] Add format "Timed Text IMSC 1.1"

---
 SubtitleEdit.sln.DotSettings                  |   1 +
 .../SubtitleFormats/NetflixImsc11Japanese.cs  |   2 +-
 src/libse/SubtitleFormats/SubtitleFormat.cs   |   1 +
 src/libse/SubtitleFormats/TimedText10.cs      |  13 +-
 .../SubtitleFormats/TimedText200604Ooyala.cs  |   2 +-
 src/libse/SubtitleFormats/TimedTextImsc11.cs  | 546 ++++++++++++++++++
 src/ui/Forms/Main.cs                          |  18 +-
 7 files changed, 571 insertions(+), 12 deletions(-)
 create mode 100644 src/libse/SubtitleFormats/TimedTextImsc11.cs

diff --git a/SubtitleEdit.sln.DotSettings b/SubtitleEdit.sln.DotSettings
index 9d0156b2c..d33014b13 100644
--- a/SubtitleEdit.sln.DotSettings
+++ b/SubtitleEdit.sln.DotSettings
@@ -42,6 +42,7 @@
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Stbl/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Tahoma/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Tesseract/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=Ttml/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Ukranian/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Unbreak/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Undocked/@EntryIndexedValue">True</s:Boolean>
diff --git a/src/libse/SubtitleFormats/NetflixImsc11Japanese.cs b/src/libse/SubtitleFormats/NetflixImsc11Japanese.cs
index 3e1f485fe..1f1194f82 100644
--- a/src/libse/SubtitleFormats/NetflixImsc11Japanese.cs
+++ b/src/libse/SubtitleFormats/NetflixImsc11Japanese.cs
@@ -8,7 +8,7 @@ using System.Xml;
 namespace Nikse.SubtitleEdit.Core.SubtitleFormats
 {
     /// <summary>
-    /// IMSC 1.1 Viewer: http://sandflow.com/imsc1_1/
+    /// IMSC 1.1 Viewer: https://www.sandflow.com/imsc1_1/
     /// More about bouten/furigana: https://www.japanesewithanime.com/2018/03/furigana-dots-bouten.html
     /// Netflix blog entry: https://medium.com/netflix-techblog/implementing-japanese-subtitles-on-netflix-c165fbe61989
     /// </summary>
diff --git a/src/libse/SubtitleFormats/SubtitleFormat.cs b/src/libse/SubtitleFormats/SubtitleFormat.cs
index 8ef4bb055..77119252e 100644
--- a/src/libse/SubtitleFormats/SubtitleFormat.cs
+++ b/src/libse/SubtitleFormats/SubtitleFormat.cs
@@ -223,6 +223,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
                     new TimedText200604CData(),
                     new TimedText200604Ooyala(),
                     new TimedText(),
+                    new TimedTextImsc11(),
                     new TitleExchangePro(),
                     new Titra(),
                     new TmpegEncText(),
diff --git a/src/libse/SubtitleFormats/TimedText10.cs b/src/libse/SubtitleFormats/TimedText10.cs
index eec9bcdb6..9f71fd677 100644
--- a/src/libse/SubtitleFormats/TimedText10.cs
+++ b/src/libse/SubtitleFormats/TimedText10.cs
@@ -31,7 +31,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
         {
             var sb = new StringBuilder();
             lines.ForEach(line => sb.AppendLine(line));
-            string xmlAsString = sb.ToString().Trim();
+            var xmlAsString = sb.ToString().Trim();
 
             if (xmlAsString.Contains("xmlns:tts=\"http://www.w3.org/2006/04"))
             {
@@ -41,6 +41,16 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
             if (xmlAsString.Contains("http://www.w3.org/ns/ttml"))
             {
                 xmlAsString = xmlAsString.RemoveControlCharactersButWhiteSpace();
+
+                if (xmlAsString.Contains("profile/imsc1"))
+                {
+                    var f = new TimedTextImsc11();
+                    if (f.IsMine(lines, fileName))
+                    {
+                        return false;
+                    }
+                }
+
                 var xml = new XmlDocument { XmlResolver = null };
                 try
                 {
@@ -79,6 +89,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
                     }
                 }
             }
+
             return false;
         }
 
diff --git a/src/libse/SubtitleFormats/TimedText200604Ooyala.cs b/src/libse/SubtitleFormats/TimedText200604Ooyala.cs
index 46a57a0a3..a0ac3a735 100644
--- a/src/libse/SubtitleFormats/TimedText200604Ooyala.cs
+++ b/src/libse/SubtitleFormats/TimedText200604Ooyala.cs
@@ -19,7 +19,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
         {
             var sb = new StringBuilder();
             lines.ForEach(line => sb.AppendLine(line));
-            string xmlAsString = sb.ToString().Replace("http://www.w3.org/2006/04/ttaf1#styling\"xml:lang", "http://www.w3.org/2006/04/ttaf1#styling\" xml:lang").Trim();
+            var xmlAsString = sb.ToString().Replace("http://www.w3.org/2006/04/ttaf1#styling\"xml:lang", "http://www.w3.org/2006/04/ttaf1#styling\" xml:lang").Trim();
 
             if (xmlAsString.Contains("http://www.w3.org/2006/10"))
             {
diff --git a/src/libse/SubtitleFormats/TimedTextImsc11.cs b/src/libse/SubtitleFormats/TimedTextImsc11.cs
new file mode 100644
index 000000000..8dfb69475
--- /dev/null
+++ b/src/libse/SubtitleFormats/TimedTextImsc11.cs
@@ -0,0 +1,546 @@
+using Nikse.SubtitleEdit.Core.Common;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Xml;
+
+namespace Nikse.SubtitleEdit.Core.SubtitleFormats
+{
+    /// <summary>
+    /// IMSC 1.1 Viewer: https://www.sandflow.com/imsc1_1/
+    /// </summary>
+    public class TimedTextImsc11 : SubtitleFormat
+    {
+        public override string Extension => ".xml";
+        public override string Name => "Timed Text IMSC 1.1";
+
+        private static string GetXmlStructure()
+        {
+            return @"<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+<tt xml:lang='en' xmlns='http://www.w3.org/ns/ttml' ttp:contentProfiles='http://www.w3.org/ns/ttml/profile/imsc1.1/text' xmlns:tts='http://www.w3.org/ns/ttml#styling' xmlns:ttm='http://www.w3.org/ns/ttml#metadata' xmlns:ttp='http://www.w3.org/ns/ttml#parameter' ttp:timeBase='media' ttp:frameRate='24' ttp:frameRateMultiplier='1000 1001' ttp:tickRate='10000000' xmlns:ebutts='urn:ebu:tt:style' xmlns:itts='http://www.w3.org/ns/ttml/profile/imsc1#styling' xmlns:ittp='http://www.w3.org/ns/ttml/profile/imsc1#parameter' xmlns:ittm='http://www.w3.org/ns/ttml/profile/imsc1#metadata' ittp:aspectRatio='16 9'>
+  <head>
+    <styling>
+      <style xml:id='style.center' tts:backgroundColor='transparent' tts:color='white' tts:fontFamily='Arial' tts:fontSize='100%' tts:textAlign='center' tts:textOutline='black 2px' />
+      <style xml:id='style.italic' tts:shear='16.6667%' tts:backgroundColor='transparent' tts:color='white' tts:fontFamily='Arial' tts:fontSize='100%' tts:textAlign='center' tts:textOutline='black 2px' />
+    </styling>
+    <layout>
+      <region xml:id='region.topLeft' tts:extent='80% 40%' tts:origin='10% 10%' tts:displayAlign='before' tts:textAlign='start' />
+      <region xml:id='region.centerLeft' tts:extent='80% 40%' tts:origin='10% 30%' tts:displayAlign='center' tts:textAlign='start' />
+      <region xml:id='region.bottomLeft' tts:extent='80% 40%' tts:origin='10% 50%' tts:displayAlign='after' tts:textAlign='start' />
+ 
+      <region xml:id='region.topCenter' tts:extent='80% 40%' tts:origin='10% 10%' tts:displayAlign='before' tts:textAlign='center' />
+      <region xml:id='region.centerCenter' tts:extent='80% 40%' tts:origin='10% 30%' tts:displayAlign='center' tts:textAlign='center' />
+      <region xml:id='region.bottomCenter' tts:extent='80% 40%' tts:origin='10% 50%' tts:displayAlign='after' tts:textAlign='center' />
+
+      <region xml:id='region.topRight' tts:extent='80% 40%' tts:origin='10% 10%' tts:displayAlign='before' tts:textAlign='end' />
+      <region xml:id='region.centerRight' tts:extent='80% 40%' tts:origin='10% 30%' tts:displayAlign='center' tts:textAlign='end'  />
+      <region xml:id='region.bottomRight' tts:extent='80% 40%' tts:origin='10% 50%' tts:displayAlign='after' tts:textAlign='end'  />
+    </layout>
+  </head>
+  <body>
+    <div>
+    </div>
+  </body>
+</tt>
+".Replace('\'', '"');
+        }
+
+        public override bool IsMine(List<string> lines, string fileName)
+        {
+            if (fileName != null && !(fileName.EndsWith(Extension, StringComparison.OrdinalIgnoreCase) || fileName.EndsWith(".xml", StringComparison.OrdinalIgnoreCase)))
+            {
+                return false;
+            }
+
+            var sb = new StringBuilder();
+            lines.ForEach(line => sb.AppendLine(line));
+            var text = sb.ToString();
+            if (text.Contains("lang=\"ja\"", StringComparison.Ordinal) && text.Contains("bouten-", StringComparison.Ordinal))
+            {
+                return false;
+            }
+
+            return text.Contains("profile/imsc1") && base.IsMine(lines, fileName);
+        }
+
+        public override string ToText(Subtitle subtitle, string title)
+        {
+            var xml = new XmlDocument { XmlResolver = null };
+            xml.LoadXml(GetXmlStructure());
+            var namespaceManager = new XmlNamespaceManager(xml.NameTable);
+            namespaceManager.AddNamespace("ttml", "http://www.w3.org/ns/ttml");
+            var div = xml.DocumentElement.SelectSingleNode("ttml:body", namespaceManager).SelectSingleNode("ttml:div", namespaceManager);
+            foreach (var p in subtitle.Paragraphs)
+            {
+                var paragraphNode = MakeParagraph(xml, p);
+                div.AppendChild(paragraphNode);
+            }
+
+            var xmlString = ToUtf8XmlString(xml).Replace(" xmlns=\"\"", string.Empty);
+            subtitle.Header = xmlString;
+            return xmlString;
+        }
+
+        private static XmlNode MakeParagraph(XmlDocument xml, Paragraph p)
+        {
+            XmlNode paragraph = xml.CreateElement("p", "http://www.w3.org/ns/ttml");
+            string text = p.Text.RemoveControlCharactersButWhiteSpace();
+
+            XmlAttribute start = xml.CreateAttribute("begin");
+            start.InnerText = TimedText10.ConvertToTimeString(p.StartTime);
+            paragraph.Attributes.Append(start);
+
+            XmlAttribute dur = xml.CreateAttribute("dur");
+            dur.InnerText = TimedText10.ConvertToTimeString(p.Duration);
+            paragraph.Attributes.Append(dur);
+
+            XmlAttribute region = xml.CreateAttribute("region");
+            region.InnerText = GetRegionFromText(p.Text);
+            paragraph.Attributes.Append(region);
+
+            // Trying to parse and convert paragraph content
+            try
+            {
+                text = Utilities.RemoveSsaTags(text);
+                text = string.Join("<br/>", text.SplitToLines());
+                var paragraphContent = new XmlDocument();
+                paragraphContent.LoadXml($"<root>{text.Replace("&", "&amp;")}</root>");
+                ConvertParagraphNodeToTtmlNode(paragraphContent.DocumentElement, xml, paragraph);
+            }
+            catch // Wrong markup, clear it
+            {
+                text = Regex.Replace(text, "[<>]", "");
+                paragraph.AppendChild(xml.CreateTextNode(text));
+            }
+
+            return paragraph;
+        }
+
+        internal static void ConvertParagraphNodeToTtmlNode(XmlNode node, XmlDocument ttmlXml, XmlNode ttmlNode)
+        {
+            foreach (XmlNode child in node.ChildNodes)
+            {
+                if (child is XmlText)
+                {
+                    ttmlNode.AppendChild(ttmlXml.CreateTextNode(child.Value));
+                }
+                else if (child.Name == "br")
+                {
+                    XmlNode br = ttmlXml.CreateElement("br");
+                    ttmlNode.AppendChild(br);
+
+                    ConvertParagraphNodeToTtmlNode(child, ttmlXml, br);
+                }
+                else if (child.Name == "i")
+                {
+                    XmlNode span = ttmlXml.CreateElement("span");
+                    XmlAttribute attr = ttmlXml.CreateAttribute("style");
+                    attr.InnerText = "italic";
+                    span.Attributes.Append(attr);
+                    ttmlNode.AppendChild(span);
+
+                    ConvertParagraphNodeToTtmlNode(child, ttmlXml, span);
+                }
+                else // Default - skip node
+                {
+                    ConvertParagraphNodeToTtmlNode(child, ttmlXml, ttmlNode);
+                }
+            }
+        }
+
+        private static string GetRegionFromText(string text)
+        {
+            if (text.StartsWith(@"{\an7", StringComparison.Ordinal))
+            {
+                return "region.topLeft";
+            }
+
+            if (text.StartsWith(@"{\an8", StringComparison.Ordinal))
+            {
+                return "region.topCenter";
+            }
+
+            if (text.StartsWith(@"{\an9", StringComparison.Ordinal))
+            {
+                return "region.topRight";
+            }
+
+
+            if (text.StartsWith(@"{\an4", StringComparison.Ordinal))
+            {
+                return "region.centerLeft";
+            }
+
+            if (text.StartsWith(@"{\an5", StringComparison.Ordinal))
+            {
+                return "region.centerCenter";
+            }
+
+            if (text.StartsWith(@"{\an6", StringComparison.Ordinal))
+            {
+                return "region.centerRight";
+            }
+
+
+            if (text.StartsWith(@"{\an1", StringComparison.Ordinal))
+            {
+                return "region.bottomLeft";
+            }
+
+            if (text.StartsWith(@"{\an3", StringComparison.Ordinal))
+            {
+                return "region.bottomRight";
+            }
+
+            return "region.bottomCenter";
+        }
+
+        private static string GetAssStyleFromRegion(string region)
+        {
+            switch (region)
+            {
+                case "region.topLeft": return @"{\an7}";
+                case "region.topCenter": return @"{\an8}";
+                case "region.topRight": return @"{\an9}";
+                case "region.centerLeft": return @"{\an4}";
+                case "region.centerCenter": return @"{\an5}";
+                case "region.centerRight": return @"{\an6}";
+                case "region.bottomLeft": return @"{\an1}";
+                case "region.bottomRight": return @"{\an3}";
+                default: return string.Empty;
+            }
+        }
+
+        private static List<string> GetStyles()
+        {
+            return TimedText10.GetStylesFromHeader(GetXmlStructure());
+        }
+
+        public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
+        {
+            _errorCount = 0;
+
+            var sb = new StringBuilder();
+            lines.ForEach(line => sb.AppendLine(line));
+            var xml = new XmlDocument { XmlResolver = null, PreserveWhitespace = true };
+            try
+            {
+                xml.LoadXml(sb.ToString().RemoveControlCharactersButWhiteSpace().Trim());
+            }
+            catch
+            {
+                xml.LoadXml(sb.ToString().Replace(" & ", " &amp; ").Replace("Q&A", "Q&amp;A").RemoveControlCharactersButWhiteSpace().Trim());
+            }
+
+            var frameRateAttr = xml.DocumentElement.Attributes["ttp:frameRate"];
+            if (frameRateAttr != null)
+            {
+                if (double.TryParse(frameRateAttr.Value, out var fr))
+                {
+                    if (fr > 20 && fr < 100)
+                    {
+                        Configuration.Settings.General.CurrentFrameRate = fr;
+                    }
+
+                    var frameRateMultiplier = xml.DocumentElement.Attributes["ttp:frameRateMultiplier"];
+                    if (frameRateMultiplier != null)
+                    {
+                        if (frameRateMultiplier.InnerText == "999 1000" && Math.Abs(fr - 30) < 0.01)
+                        {
+                            Configuration.Settings.General.CurrentFrameRate = 29.97;
+                        }
+                        else if (frameRateMultiplier.InnerText == "999 1000" && Math.Abs(fr - 24) < 0.01)
+                        {
+                            Configuration.Settings.General.CurrentFrameRate = 23.976;
+                        }
+                        else
+                        {
+                            var arr = frameRateMultiplier.InnerText.Split();
+                            if (arr.Length == 2 && Utilities.IsInteger(arr[0]) && Utilities.IsInteger(arr[1]) && int.Parse(arr[1]) > 0)
+                            {
+                                fr = double.Parse(arr[0]) / double.Parse(arr[1]);
+                                if (fr > 20 && fr < 100)
+                                {
+                                    Configuration.Settings.General.CurrentFrameRate = fr;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            if (BatchSourceFrameRate.HasValue)
+            {
+                Configuration.Settings.General.CurrentFrameRate = BatchSourceFrameRate.Value;
+            }
+
+            Configuration.Settings.SubtitleSettings.TimedText10TimeCodeFormatSource = null;
+            subtitle.Header = sb.ToString();
+
+            var namespaceManager = new XmlNamespaceManager(xml.NameTable);
+            namespaceManager.AddNamespace("ttml", "http://www.w3.org/ns/ttml");
+            var body = xml.DocumentElement.SelectSingleNode("ttml:body", namespaceManager);
+            foreach (XmlNode node in body.SelectNodes("//ttml:p", namespaceManager))
+            {
+                TimedText10.ExtractTimeCodes(node, subtitle, out var begin, out var end);
+                var assStyle = string.Empty;
+                var region = node.Attributes?["region"];
+                if (region != null)
+                {
+                    assStyle = GetAssStyleFromRegion(region.InnerText);
+                }
+
+                var text = assStyle + ReadParagraph(node, xml);
+                var p = new Paragraph(begin, end, text);
+                subtitle.Paragraphs.Add(p);
+            }
+
+            subtitle.Renumber();
+        }
+
+        private static string ReadParagraph(XmlNode node, XmlDocument xml)
+        {
+            var pText = new StringBuilder();
+            var styles = GetStyles();
+            foreach (XmlNode child in node.ChildNodes)
+            {
+                if (child.NodeType == XmlNodeType.Text)
+                {
+                    pText.Append(child.Value);
+                }
+                else if (child.Name == "br" || child.Name == "tt:br")
+                {
+                    pText.AppendLine();
+                }
+                else if (child.Name == "#significant-whitespace" || child.Name == "tt:#significant-whitespace")
+                {
+                    pText.Append(child.InnerText);
+                }
+                else if (child.Name == "span" || child.Name == "tt:span")
+                {
+                   var isItalic = false;
+                   var isBold = false;
+                   var isUnderlined = false;
+                    string fontFamily = null;
+                    string color = null;
+                  
+
+                    // Composing styles
+
+                    if (child.Attributes["style"] != null)
+                    {
+                        var styleName = child.Attributes["style"].Value;
+                       
+                        if (styles.Contains(styleName))
+                        {
+                            try
+                            {
+                                var nsmgr = new XmlNamespaceManager(xml.NameTable);
+                                nsmgr.AddNamespace("ttml", "http://www.w3.org/ns/ttml");
+                                XmlNode head = xml.DocumentElement.SelectSingleNode("ttml:head", nsmgr);
+                                foreach (XmlNode styleNode in head.SelectNodes("//ttml:style", nsmgr))
+                                {
+                                    string currentStyle = null;
+                                    if (styleNode.Attributes["xml:id"] != null)
+                                    {
+                                        currentStyle = styleNode.Attributes["xml:id"].Value;
+                                    }
+                                    else if (styleNode.Attributes["id"] != null)
+                                    {
+                                        currentStyle = styleNode.Attributes["id"].Value;
+                                    }
+
+                                    if (currentStyle == styleName)
+                                    {
+                                        if (styleNode.Attributes["tts:fontStyle"] != null && styleNode.Attributes["tts:fontStyle"].Value == "italic")
+                                        {
+                                            isItalic = true;
+                                        }
+
+                                        if (styleNode.Attributes["tts:fontWeight"] != null && styleNode.Attributes["tts:fontWeight"].Value == "bold")
+                                        {
+                                            isBold = true;
+                                        }
+
+                                        if (styleNode.Attributes["tts:textDecoration"] != null && styleNode.Attributes["tts:textDecoration"].Value == "underline")
+                                        {
+                                            isUnderlined = true;
+                                        }
+
+                                        if (styleNode.Attributes["tts:fontFamily"] != null)
+                                        {
+                                            fontFamily = styleNode.Attributes["tts:fontFamily"].Value;
+                                        }
+
+                                        if (styleNode.Attributes["tts:color"] != null)
+                                        {
+                                            color = styleNode.Attributes["tts:color"].Value;
+                                        }
+                                    }
+                                }
+                            }
+                            catch (Exception e)
+                            {
+                                System.Diagnostics.Debug.WriteLine(e);
+                            }
+                        }
+                    }
+
+                    if (child.Attributes["tts:fontStyle"] != null && child.Attributes["tts:fontStyle"].Value == "italic")
+                    {
+                        isItalic = true;
+                    }
+                    else if (child.Attributes["style"] != null && child.Attributes["style"].Value == "italic")
+                    {
+                        isItalic = true;
+                    }
+
+
+                    if (child.Attributes["tts:fontWeight"] != null && child.Attributes["tts:fontWeight"].Value == "bold")
+                    {
+                        isBold = true;
+                    }
+
+                    if (child.Attributes["tts:textDecoration"] != null && child.Attributes["tts:textDecoration"].Value == "underline")
+                    {
+                        isUnderlined = true;
+                    }
+
+                    if (child.Attributes["tts:fontFamily"] != null)
+                    {
+                        fontFamily = child.Attributes["tts:fontFamily"].Value;
+                    }
+
+                    if (child.Attributes["tts:color"] != null)
+                    {
+                        color = child.Attributes["tts:color"].Value;
+                    }
+
+
+                    // Applying styles
+                    if (isItalic)
+                    {
+                        pText.Append("<i>");
+                    }
+
+                    if (isBold)
+                    {
+                        pText.Append("<b>");
+                    }
+
+                    if (isUnderlined)
+                    {
+                        pText.Append("<u>");
+                    }
+
+
+
+                    if (!string.IsNullOrEmpty(fontFamily) || !string.IsNullOrEmpty(color))
+                    {
+                        pText.Append("<font");
+
+                        if (!string.IsNullOrEmpty(fontFamily))
+                        {
+                            pText.Append($" face=\"{fontFamily}\"");
+                        }
+
+                        if (!string.IsNullOrEmpty(color))
+                        {
+                            pText.Append($" color=\"{color}\"");
+                        }
+
+                        pText.Append(">");
+                    }
+
+                    pText.Append(ReadParagraph(child, xml));
+
+                    if (!string.IsNullOrEmpty(fontFamily) || !string.IsNullOrEmpty(color))
+                    {
+                        pText.Append("</font>");
+                    }
+
+                    if (isUnderlined)
+                    {
+                        pText.Append("</u>");
+                    }
+
+                    if (isBold)
+                    {
+                        pText.Append("</b>");
+                    }
+
+                    if (isItalic)
+                    {
+                        pText.Append("</i>");
+                    }
+                }
+            }
+
+            return pText.ToString().TrimEnd();
+        }
+
+        public static string RemoveTags(string text)
+        {
+            return text
+                .Replace("<bouten-dot-before>", string.Empty)
+                .Replace("</bouten-dot-before>", string.Empty)
+
+                .Replace("<bouten-dot-after>", string.Empty)
+                .Replace("</bouten-dot-after>", string.Empty)
+
+                .Replace("<bouten-dot-outside>", string.Empty)
+                .Replace("</bouten-dot-outside>", string.Empty)
+
+                .Replace("<bouten-filled-circle-outside>", string.Empty)
+                .Replace("</bouten-filled-circle-outside>", string.Empty)
+
+                .Replace("<bouten-open-circle-outside>", string.Empty)
+                .Replace("</bouten-open-circle-outside>", string.Empty)
+
+                .Replace("<bouten-open-dot-outside>", string.Empty)
+                .Replace("</bouten-open-dot-outside>", string.Empty)
+
+                .Replace("<bouten-filled-sesame-outside>", string.Empty)
+                .Replace("</bouten-filled-sesame-outside>", string.Empty)
+
+                .Replace("<bouten-open-sesame-outside>", string.Empty)
+                .Replace("</bouten-open-sesame-outside>", string.Empty)
+
+                .Replace("<bouten-auto-outside>", string.Empty)
+                .Replace("</bouten-auto-outside>", string.Empty)
+
+                .Replace("<bouten-auto>", string.Empty)
+                .Replace("</bouten-auto>", string.Empty)
+
+                .Replace("<horizontalDigit>", string.Empty)
+                .Replace("</horizontalDigit>", string.Empty)
+
+                .Replace("<ruby-container>", string.Empty)
+                .Replace("</ruby-container>", string.Empty)
+
+                .Replace("<ruby-base>", string.Empty)
+                .Replace("</ruby-base>", string.Empty)
+
+                .Replace("<ruby-base-italic>", string.Empty)
+                .Replace("</ruby-base-italic>", string.Empty)
+
+                .Replace("<ruby-text>", string.Empty)
+                .Replace("</ruby-text>", string.Empty)
+
+                .Replace("<ruby-text-after>", string.Empty)
+                .Replace("</ruby-text-after>", string.Empty)
+
+                .Replace("<ruby-text-italic>", string.Empty)
+                .Replace("</ruby-text-italic>", string.Empty);
+        }
+
+        public override void RemoveNativeFormatting(Subtitle subtitle, SubtitleFormat newFormat)
+        {
+            foreach (var p in subtitle.Paragraphs)
+            {
+                p.Text = RemoveTags(p.Text);
+            }
+        }
+    }
+}
diff --git a/src/ui/Forms/Main.cs b/src/ui/Forms/Main.cs
index a6a1cf28a..4893b6abd 100644
--- a/src/ui/Forms/Main.cs
+++ b/src/ui/Forms/Main.cs
@@ -2337,7 +2337,7 @@ namespace Nikse.SubtitleEdit.Forms
                         styles = AdvancedSubStationAlpha.GetStylesFromHeader(AdvancedSubStationAlpha.DefaultHeader);
                     }
                 }
-                else if (formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText))
+                else if (formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText) || formatType == typeof(TimedTextImsc11))
                 {
                     styles = TimedText10.GetStylesFromHeader(_subtitle.Header);
                 }
@@ -2373,7 +2373,7 @@ namespace Nikse.SubtitleEdit.Forms
                 {
                     SubtitleListview1.ShowExtraColumn(_languageGeneral.Class);
                 }
-                else if (formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText))
+                else if (formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText) || formatType == typeof(TimedTextImsc11))
                 {
                     SubtitleListview1.ShowExtraColumn(_languageGeneral.StyleLanguage);
                 }
@@ -9294,7 +9294,7 @@ namespace Nikse.SubtitleEdit.Forms
                     }
                 }
             }
-            else if (((formatType == typeof(TimedText10) && Configuration.Settings.SubtitleSettings.TimedText10ShowStyleAndLanguage) || formatType == typeof(ItunesTimedText)) && SubtitleListview1.SelectedItems.Count > 0)
+            else if (((formatType == typeof(TimedText10) && Configuration.Settings.SubtitleSettings.TimedText10ShowStyleAndLanguage) || formatType == typeof(ItunesTimedText) || formatType == typeof(TimedTextImsc11)) && SubtitleListview1.SelectedItems.Count > 0)
             {
                 toolStripMenuItemWebVTT.Visible = false;
                 toolStripMenuItemAssStyles.Text = _language.Menu.ContextMenu.TimedTextStyles;
@@ -9857,7 +9857,7 @@ namespace Nikse.SubtitleEdit.Forms
 
                 var format = GetCurrentSubtitleFormat();
                 var formatType = format.GetType();
-                if ((formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText)))
+                if ((formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText) || formatType == typeof(TimedTextImsc11)))
                 {
                     foreach (int index in SubtitleListview1.SelectedIndices)
                     {
@@ -10684,7 +10684,7 @@ namespace Nikse.SubtitleEdit.Forms
             {
                 styles = AdvancedSubStationAlpha.GetStylesFromHeader(_subtitle.Header);
             }
-            else if (formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText))
+            else if (formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText) || formatType == typeof(TimedTextImsc11))
             {
                 styles = TimedText10.GetStylesFromHeader(_subtitle.Header);
             }
@@ -10702,7 +10702,7 @@ namespace Nikse.SubtitleEdit.Forms
             if (useExtraForStyle)
             {
                 newParagraph.Extra = style;
-                if (format.GetType() == typeof(TimedText10) || format.GetType() == typeof(ItunesTimedText))
+                if (format.GetType() == typeof(TimedText10) || format.GetType() == typeof(ItunesTimedText) || formatType == typeof(TimedTextImsc11))
                 {
                     if (styles.Count > 0)
                     {
@@ -25451,7 +25451,7 @@ namespace Nikse.SubtitleEdit.Forms
                 toolStripMenuItemFileFormatProperties.Text = string.Format(_language.Menu.File.FormatXProperties, format.Name);
             }
 
-            if (ft == typeof(TimedText10) || ft == typeof(ItunesTimedText))
+            if (ft == typeof(TimedText10) || ft == typeof(ItunesTimedText) || ft == typeof(TimedTextImsc11))
             {
                 toolStripMenuItemFileFormatProperties.Visible = true;
                 toolStripMenuItemFileFormatProperties.Text = string.Format(_language.Menu.File.FormatXProperties, format.Name);
@@ -31995,7 +31995,7 @@ namespace Nikse.SubtitleEdit.Forms
                     }
                 }
             }
-            else if (formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText))
+            else if (formatType == typeof(TimedText10) || formatType == typeof(ItunesTimedText) || formatType == typeof(TimedTextImsc11))
             {
                 using (var styles = new TimedTextStyles(_subtitle))
                 {
@@ -32435,7 +32435,7 @@ namespace Nikse.SubtitleEdit.Forms
                 return;
             }
 
-            if (ft == typeof(TimedText10))
+            if (ft == typeof(TimedText10) || ft == typeof(TimedTextImsc11))
             {
                 using (var properties = new TimedTextProperties(_subtitle))
                 {