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* ttml to vtt * update TtmlToVttConverter util class， add vtt header * update * save update * update
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| using AMSMigrate.Contracts; | ||
| using System.IO; | ||
| using System.Text; | ||
| using System.Text.RegularExpressions; | ||
| using System.Xml; | ||
| using System.Xml.Serialization; | ||
|
|
||
| public static class TtmlToVttConverter | ||
| { | ||
| public static string? Convert(byte[]? ttmlText) | ||
| { | ||
| if (ttmlText == null) | ||
| { | ||
| throw new InvalidOperationException("TtmlToVttConverter: Ttml is null"); | ||
| } | ||
|
|
||
| string? webVttContentRes = null; | ||
|
|
||
| XmlReaderSettings settings = new XmlReaderSettings(); | ||
| settings.DtdProcessing = DtdProcessing.Prohibit; | ||
|
|
||
| using (MemoryStream mdatStream = new MemoryStream(ttmlText)) | ||
| using (XmlReader reader = XmlReader.Create(mdatStream, settings)) | ||
| { | ||
| StringBuilder webVttContent = new StringBuilder(); | ||
|
|
||
| string strStartCue = string.Empty, strCueSize = string.Empty, strAlign = string.Empty; | ||
|
|
||
| while (!reader.EOF) | ||
| { | ||
| StringBuilder strText = new StringBuilder(); | ||
| string? strStartTime = null, strEndTime = null, strEntry = null; | ||
| reader.Read(); | ||
| switch (reader.NodeType) | ||
| { | ||
| case XmlNodeType.Element: | ||
| if (reader.Name.Equals("region", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| ParseRegionAttributes(reader, out strStartCue, out strCueSize, out strAlign); | ||
| continue; | ||
| } | ||
| else if (!reader.Name.Equals("p", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| continue; | ||
| } | ||
| break; | ||
|
|
||
| default: | ||
| continue; | ||
| } | ||
|
|
||
| bool isEOF = reader.MoveToFirstAttribute(); | ||
| while (isEOF) | ||
| { | ||
| string pszName = reader.Name; | ||
| string pszValue = reader.Value; | ||
|
|
||
| if (pszName.Equals("begin", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| strStartTime = pszValue; | ||
| } | ||
| else if (pszName.Equals("end", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| strEndTime = pszValue; | ||
| } | ||
| isEOF = reader.MoveToNextAttribute(); | ||
| } | ||
|
|
||
| if (string.IsNullOrEmpty(strStartTime) || string.IsNullOrEmpty(strEndTime)) | ||
| { | ||
| throw new InvalidOperationException("Missing begin or end attributes."); | ||
| } | ||
|
|
||
| XmlNodeType nodeType; | ||
| bool fDone = false; | ||
|
|
||
| do | ||
| { | ||
| reader.Read(); | ||
| nodeType = reader.NodeType; | ||
|
|
||
| switch (nodeType) | ||
| { | ||
| case XmlNodeType.Text: | ||
| string pszValue = reader.Value; | ||
| strText.Append(pszValue); | ||
| break; | ||
|
|
||
| case XmlNodeType.Element: | ||
| string pszName = reader.Name; | ||
| if (pszName.Equals("br", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| strText.AppendLine(); | ||
| } | ||
| break; | ||
|
|
||
| case XmlNodeType.EndElement: | ||
| string endElementName = reader.Name; | ||
| if (endElementName.Equals("p", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| fDone = true; | ||
| } | ||
| break; | ||
|
|
||
| default: | ||
| break; | ||
| } | ||
| } while (!fDone); | ||
| var formattedString = strText.ToString(); | ||
| if (!string.IsNullOrEmpty(strAlign) && !string.IsNullOrEmpty(strStartCue) && !string.IsNullOrEmpty(strCueSize)&& !string.IsNullOrEmpty(formattedString)) | ||
| { | ||
| strEntry = string.Format( | ||
| "\n\n{0} --> {1} position:{2} align:{3} size:{4}\n{5}", | ||
| strStartTime, strEndTime, strStartCue, strAlign, strCueSize, formattedString); | ||
| } | ||
| else if(!string.IsNullOrEmpty(formattedString)) | ||
| { | ||
| strEntry = string.Format( | ||
| "\n\n{0} --> {1}\n{2}", | ||
| strStartTime, strEndTime, formattedString); | ||
| } | ||
| if (!string.IsNullOrEmpty(strEntry)) | ||
| { | ||
| webVttContent.Append(strEntry); | ||
| } | ||
| } | ||
|
|
||
| webVttContentRes= webVttContent.ToString(); | ||
| } | ||
| return !string.IsNullOrEmpty(webVttContentRes) ? webVttContentRes: null; //webVttContentRes;Regex.Replace(webVttContentRes, @"[\x00-\x1F\x7F]", "\n") | ||
| } | ||
|
|
||
| private static void ParseRegionAttributes(XmlReader pReader, out string strStartCue, out string strCueSize, out string strAlign) | ||
| { | ||
| strStartCue = strCueSize = strAlign = string.Empty; | ||
|
|
||
| while (pReader.MoveToNextAttribute()) | ||
| { | ||
| string pszName = pReader.Name; | ||
| string pszValue = pReader.Value; | ||
| string? pszTmp = null; | ||
|
|
||
| if (pszName.Equals("tts:origin", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| int index = pszValue.IndexOf('%'); | ||
| if (index >= 0) | ||
| { | ||
| pszTmp = pszValue.Substring(0, index + 1); | ||
| } | ||
| } | ||
| else if (pszName.Equals("tts:extent", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| int index = pszValue.IndexOf('%'); | ||
| if (index >= 0) | ||
| { | ||
| pszTmp = pszValue.Substring(0, index + 1); | ||
| } | ||
| } | ||
| else if (pszName.Equals("tts:textAlign", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| strAlign = pszValue; | ||
| } | ||
|
|
||
| if (pszTmp != null) | ||
| { | ||
| if (pszName.Equals("tts:origin", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| strStartCue = pszTmp; | ||
| } | ||
| else if (pszName.Equals("tts:extent", StringComparison.OrdinalIgnoreCase)) | ||
| { | ||
| strCueSize = pszTmp; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |