56 lines
2.0 KiB
C#
56 lines
2.0 KiB
C#
using System;
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using System.IO;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading;
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using MediaBrowser.Model.MediaInfo;
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namespace MediaBrowser.MediaEncoding.Subtitles
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{
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/// <summary>
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/// Subtitle writer for the WebVTT format.
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/// </summary>
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public class VttWriter : ISubtitleWriter
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{
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/// <inheritdoc />
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public void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken)
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{
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using (var writer = new StreamWriter(stream, Encoding.UTF8, 1024, true))
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{
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writer.WriteLine("WEBVTT");
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writer.WriteLine();
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writer.WriteLine("REGION");
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writer.WriteLine("id:subtitle");
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writer.WriteLine("width:80%");
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writer.WriteLine("lines:3");
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writer.WriteLine("regionanchor:50%,100%");
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writer.WriteLine("viewportanchor:50%,90%");
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writer.WriteLine();
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foreach (var trackEvent in info.TrackEvents)
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{
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cancellationToken.ThrowIfCancellationRequested();
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var startTime = TimeSpan.FromTicks(trackEvent.StartPositionTicks);
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var endTime = TimeSpan.FromTicks(trackEvent.EndPositionTicks);
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// make sure the start and end times are different and sequential
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if (endTime.TotalMilliseconds <= startTime.TotalMilliseconds)
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{
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endTime = startTime.Add(TimeSpan.FromMilliseconds(1));
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}
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writer.WriteLine(@"{0:hh\:mm\:ss\.fff} --> {1:hh\:mm\:ss\.fff} region:subtitle", startTime, endTime);
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var text = trackEvent.Text;
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// TODO: Not sure how to handle these
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text = Regex.Replace(text, @"\\n", " ", RegexOptions.IgnoreCase);
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writer.WriteLine(text);
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writer.WriteLine();
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}
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}
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}
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}
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}
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