72 lines
2.7 KiB
C#
72 lines
2.7 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text.RegularExpressions;
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using System.Threading;
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namespace MediaBrowser.MediaEncoding.Subtitles
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{
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public class AssParser : ISubtitleParser
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{
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private readonly CultureInfo _usCulture = new CultureInfo("en-US");
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public SubtitleTrackInfo Parse(Stream stream, CancellationToken cancellationToken)
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{
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var trackInfo = new SubtitleTrackInfo();
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var eventIndex = 1;
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using (var reader = new StreamReader(stream))
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{
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string line;
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while (reader.ReadLine() != "[Events]")
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{}
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var headers = ParseFieldHeaders(reader.ReadLine());
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while ((line = reader.ReadLine()) != null)
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{
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cancellationToken.ThrowIfCancellationRequested();
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if (string.IsNullOrWhiteSpace(line))
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{
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continue;
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}
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if(line.StartsWith("["))
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break;
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if(string.IsNullOrEmpty(line))
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continue;
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var subEvent = new SubtitleTrackEvent { Id = eventIndex.ToString(_usCulture) };
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eventIndex++;
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var sections = line.Substring(10).Split(',');
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subEvent.StartPositionTicks = GetTicks(sections[headers["Start"]]);
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subEvent.EndPositionTicks = GetTicks(sections[headers["End"]]);
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subEvent.Text = string.Join(",", sections.Skip(headers["Text"]));
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subEvent.Text = Regex.Replace(subEvent.Text, @"\{(\\[\w]+\(?([\w\d]+,?)+\)?)+\}", string.Empty, RegexOptions.IgnoreCase);
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trackInfo.TrackEvents.Add(subEvent);
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}
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}
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return trackInfo;
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}
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long GetTicks(string time)
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{
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TimeSpan span;
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return TimeSpan.TryParseExact(time, @"h\:mm\:ss\.ff", _usCulture, out span)
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? span.Ticks: 0;
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}
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private Dictionary<string,int> ParseFieldHeaders(string line) {
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var fields = line.Substring(8).Split(',').Select(x=>x.Trim()).ToList();
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var result = new Dictionary<string, int> {
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{"Start", fields.IndexOf("Start")},
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{"End", fields.IndexOf("End")},
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{"Text", fields.IndexOf("Text")}
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};
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return result;
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}
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}
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}
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