Add read support of combined ttml files - thx Martin :)

src/libse/SubtitleFormats/CombinedXml.cs

@@ -0,0 +1,110 @@
+using Nikse.SubtitleEdit.Core.Common;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Nikse.SubtitleEdit.Core.SubtitleFormats
+{
+    /// <summary>
+    /// .CHK subtitle file format - 128 bytes blocks, first byte in block is id (01==text)
+    /// </summary>
+    public class CombinedXml : SubtitleFormat
+    {
+        private const string findString = "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
+
+        public override string Extension => ".xml";
+
+        public const string NameOfFormat = "Combined xml";
+
+        public override string Name => NameOfFormat;
+
+        public override bool IsMine(List<string> lines, string fileName)
+        {
+            var sb = new StringBuilder();
+            lines.ForEach(line => sb.AppendLine(line));
+            var searchText = sb.ToString();
+            var idx = searchText.IndexOf(findString, StringComparison.Ordinal);
+            if (idx < 0)
+            {
+                return false;
+            }
+
+            if (searchText.Length > idx + findString.Length + 1 && searchText.IndexOf(findString, idx, StringComparison.Ordinal) >= 0)
+            {
+                var subtitle = new Subtitle();
+                LoadSubtitle(subtitle, lines, fileName);
+                return subtitle.Paragraphs.Count > _errorCount;
+            }
+
+            return false;
+        }
+
+        public override string ToText(Subtitle subtitle, string title)
+        {
+            return "Not implemented!";
+        }
+
+        public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
+        {
+            _errorCount = 0;
+            subtitle.Paragraphs.Clear();
+            var sb = new StringBuilder();
+            lines.ForEach(line => sb.AppendLine(line));
+            var searchText = sb.ToString();
+            var idx = searchText.IndexOf(findString, StringComparison.Ordinal);
+            var start = idx;
+            var parts = new List<string>();
+            while (idx >= 0)
+            {
+                if (idx > start)
+                {
+                    var part = searchText.Substring(start, idx - start).Trim();
+                    parts.Add(part);
+                    start = idx;
+                }
+
+                if (idx + findString.Length >= searchText.Length)
+                {
+                    break;
+                }
+
+                idx = searchText.IndexOf(findString, idx + findString.Length, StringComparison.Ordinal);
+                if (idx < 0)
+                {
+                    var part = searchText.Substring(start).Trim();
+                    parts.Add(part);
+                }
+            }
+
+            var formats = new List<SubtitleFormat>
+            {
+                new TimedText10(),
+                new NetflixTimedText(),
+                new ItunesTimedText(),
+            };
+
+            foreach (var xml in parts)
+            {
+                var xmlLines = xml.SplitToLines();
+                foreach (var format in formats)
+                {
+                    if (format.IsMine(xmlLines, fileName))
+                    {
+                        var sub = new Subtitle();
+                        format.LoadSubtitle(sub, xmlLines, fileName);
+                        subtitle.Paragraphs.AddRange(sub.Paragraphs);
+                    }
+                }
+            }
+
+            var merged = MergeLinesSameTextUtils.MergeLinesWithSameTextInSubtitle(subtitle, false, 250);
+            if (merged.Paragraphs.Count < subtitle.Paragraphs.Count)
+            {
+                subtitle.Paragraphs.Clear();
+                subtitle.Paragraphs.AddRange(merged.Paragraphs);
+            }
+
+            subtitle.Renumber();
+        }
+    }
+}

src/libse/SubtitleFormats/SubtitleFormat.cs

@@ -649,6 +649,7 @@ namespace Nikse.SubtitleEdit.Core.SubtitleFormats
                 new JsonArchtime(),
                 new MacCaption10(),
                 new Rdf1(),
+                new CombinedXml(),
             };
         }