using System.IO ;
using System.Text ;
using System.Text.RegularExpressions ;
using System.Threading ;
using MediaBrowser.Model.MediaInfo ;
namespace MediaBrowser.MediaEncoding.Subtitles
{
/// <summary>
/// TTML subtitle writer.
/// </summary>
public partial class TtmlWriter : ISubtitleWriter
{
[GeneratedRegex(@"\\n", RegexOptions.IgnoreCase)]
private static partial Regex NewLineEscapeRegex ( ) ;
/// <inheritdoc />
public void Write ( SubtitleTrackInfo info , Stream stream , CancellationToken cancellationToken )
{
// Example: https://github.com/zmalltalker/ttml2vtt/blob/master/data/sample.xml
// Parser example: https://github.com/mozilla/popcorn-js/blob/master/parsers/parserTTML/popcorn.parserTTML.js
using ( var writer = new StreamWriter ( stream , Encoding . UTF8 , 1024 , true ) )
{
writer . WriteLine ( "<?xml version=\"1.0\" encoding=\"utf-8\"?>" ) ;
writer . WriteLine ( "<tt xmlns=\"http://www.w3.org/ns/ttml\" xmlns:tts=\"http://www.w3.org/2006/04/ttaf1#styling\" lang=\"no\">" ) ;
writer . WriteLine ( "<head>" ) ;
writer . WriteLine ( "<styling>" ) ;
writer . WriteLine ( "<style id=\"italic\" tts:fontStyle=\"italic\" />" ) ;
writer . WriteLine ( "<style id=\"left\" tts:textAlign=\"left\" />" ) ;
writer . WriteLine ( "<style id=\"center\" tts:textAlign=\"center\" />" ) ;
writer . WriteLine ( "<style id=\"right\" tts:textAlign=\"right\" />" ) ;
writer . WriteLine ( "</styling>" ) ;
writer . WriteLine ( "</head>" ) ;
writer . WriteLine ( "<body>" ) ;
writer . WriteLine ( "<div>" ) ;
foreach ( var trackEvent in info . TrackEvents )
{
var text = trackEvent . Text ;
text = NewLineEscapeRegex ( ) . Replace ( text , "<br/>" ) ;
writer . WriteLine (
"<p begin=\"{0}\" dur=\"{1}\">{2}</p>" ,
trackEvent . StartPositionTicks ,
trackEvent . EndPositionTicks - trackEvent . StartPositionTicks ,
text ) ;
}
writer . WriteLine ( "</div>" ) ;
writer . WriteLine ( "</body>" ) ;
writer . WriteLine ( "</tt>" ) ;
}
}
}
}
